Power transformer installation
1 scope
The technology standard is applicable to general industrial and civil building electric installation engineering 10 kv and below the indoor transformer installation.
2 construction preparation
2.1 equipment and materials requirements:
2.1.1 transformer shall be fitted with nameplates. Nameplate shall indicate the name of manufacturer, rated capacity, a secondary rated voltage, current, impedance voltage % and wiring group and other technical data.
2.1.2 the capacity of transformer, the specification and model number must comply with the design requirements. Complete accessories, spare parts, and have the factory certificate of approval and technical documents.
2.1.3 discharge test PC value and the dry type transformer noise tester dB (A) values should comply with the design and standard requirement.
2.1.4 dry type transformer with a protective cover, shield and the distance of the transformer shall conform to the provisions of the standard, not less than the size of the table 2-23.
2.1.5 sections: various specifications steel should comply with the design requirements, and no obvious corrosion.
2.1.6 bolt: in addition to the anchor bolt and shockproof device bolt, all should use galvanized bolt, and the corresponding flat washer and spring mattress.
2.1.7 other materials: snakeskin tube, oil resistant plastic pipe, welding electrode, antirust paint, mixed paint and transformer oil, all should comply with the design requirements, and product certification.
2.2 the main equipment:
2.2.1 handling hoisting tool: crane, cars, hoist, crane township, three steps, sleeper, wire rope, band rope, rollarounds.
2.2.2 installation tools, bench drill, grinding wheel, electric welding machine, welding tools, electric hammer, vise, live wrench, hammer, set of wire plate.
2.2.3 test apparatus, steel tape, steel ruler, levels, lines, shaking table, multimeter, bridge and test instrument.
2.3 operation conditions:
2.3.1 construction drawing and technical data are complete and correct.
2.3.2 basic civil engineering construction, elevation, size, structure and embedded parts welding strength meet the design requirements.
2.3.3 transformer installed orbit, and comply with the design requirements (note: this work should be done by the built on, install units fit).
2.3.4 walls, roof, shotcrete, no leaking roof, Windows and doors and glass installation intact.
2.3.5 end of indoor ground engineering, site is clean, the roads.
2.3.6 installation of dry type transformer should be no dust, indoor relative humidity should be kept below 70%.
3 operation process
3.1 process:
The equipment point check pieces - transformer secondary handling - transformer to attachment installation, stability
Lift transformer core inspection and acceptance trial run - check before sending - sending acceptance
3.2 equipment point check:
3.2.1 equipment point check pieces shall be installed by the unit, delivery unit, in conjunction with the construction unit representatives, and make records.
3.2.2 according to equipment list, check the transformer equipment technical documents and construction drawings ontology and accessories of the specifications of the spare parts model conformed to the drawings requirements. Whether complete, the presence of loss and damage.
3.2.3 transformer appearance inspection, no damage and deformation of ontology, the paint in good condition without damage.
3.2.4 closed tank is good, do you have any oil leakage, oil leakage phenomenon, the oil standard oil level is normal, found that the problem should be dealt with immediately.
3.2.5 insulation porcelain and epoxy resin casting with and without damage, defects and cracks.
3.3 the transformer secondary handling:
3.1.1 transformer secondary handling by lifting work, should be an electrician to cooperate. Had better use mobile crane hoisting, also can use chain hoist, lifting distance is longer than the best car transport, transport must use wire rope fixed firmly, and be smooth road, to minimize the vibration; Short distance and good roads, hoist, rollarounds transportation available. Transformer weight and lifting height can be reference table for 2-24-25 and table 2.
Resin casting dry-type transformer weight table 2-24
The serial number capacity (kVA) weight (t)
1 100 ~ 200 0.71 ~ 0.92
2 1.16 ~ 1.90 of 250 ~ 500
3 2.08 ~ 2.73 of 630 ~ 1000
4 3.39 ~ 4.22 of 1250 ~ 1600
5.14 ~ 6.30 5, 2000 ~ 2000
Oil-immersed power transformer weight table 2 to 25
Serial number capacity (kVA) total weight lifting point (m) high (t)
1
2
3
4
5
6, 100-100
200 ~ 420
500 ~ 630
750 ~ 800
1000 ~ 1250
0.6 ~ 1.0 of 1600 ~ 1800
1.0 ~ 1.8
2.0 ~ 2.8
3.0 ~ 3.8
3.5 ~ 4.6
5.2 ~ 6.1 3.0 ~ 3.2
3.2 ~ 3.5
3.8 ~ 4.0
5.0
5.2
5.2 ~ 5.8
3.3.2 rainfall distribution on 10-12 transformer, lifting rigging must check unqualified, wire rope must be hung on the hook of tank, the rings only for lifting the core plate, shall not use the rings lifting the whole transformer (FIG. 2-63).
3.3.3 transformer handling, should pay attention to protect porcelain, had better use wooden cases or cover the cartons will be high and low voltage porcelain, so that it is not damaged.
3.3.4 transformer in the process of handling; There should be no shock or severe shocks, the use of mechanical drawing, drawing the focus should be on the transformer under the gravity, in case of inclined transportation Angle should not exceed 15 °, prevent the internal structure deformation.
3.3.5 with dry jin bumps up large transformer, jack should be placed in a tank of special parts.
3.3.6 large transformer before handling or loading and unloading, should check the direction of high and low pressure side, in order to avoid changing direction when installation difficulties.
3.4 the transformer unsteady loading:
3.4.1 track transformer in place available car hanging directly thrown into the transformer room, or use the sleeper erection of temporary orbit, with three steps, chain hoist crane to temporary orbit, and then use practice into indoor place.
3.4.2 transformer in place, we should pay attention to its azimuth and away from the wall size should be consistent with the drawings, the margin of error of plus or minus 25 mm, drawing without annotation, longitudinal according to orbit position, horizontal distance should not be less than 800 mm, is apart from the door should not be less than 1000 mm, and proper care of the house is located in the center of the transformer, the rings of the vertical for core, dry type transformer, and indicate the installation drawings, the installation and maintenance of the minimum distance environment should conform to the requirements of the FIG. 2-64.
Based track should be rule 3.4.3 transformer, track and wheel base should cooperate, equipped with gas relay in transformer, should make its roof along the gas relay steam flow direction with the rise of 1% ~ 1.5% gradient (except of factory regulations do not need to install slope).
3.4.4 transformer width propulsion, low voltage side should be outward; On a narrow face advancing, oil conservator side should be outward. In the case of a switch, the operating direction above 1200 mm width shall be maintained.
3.4.5 oil-immersed transformer of the installation, should consider to in the case of a charged, easy to check the oil pillow and casing of the oil level and top oil temperature, gas relay, etc.
3.4.6 transformer of roller, roller should be flexible rotation, after the transformer is in place, roller should be fixed in the braking device can dismantle.
3.4.7 transformer installation earthquake resistance measures should be taken (steady in the transformer on the concrete floor installation as shown in figure 2-65, a concrete rail beam breadth surface propulsion transformer installation see (FIG. 2-66).
3.5 the attachment installation:
Gas relay in 3.5.1 track of installation:
3.5.1.1 gas relay before installation should via inspection appraisal:
3.5.1.2 gas relay should be installed, the window should be installed in the side for easy check, direction of the arrow should point to the oil pillow, and the communicating pipe connection should be properly sealed. Containment between valve should be located in the oil conservator and gas relay.
3.5.1.3 play open gas mouth, let out the air, until the oil spill will be deflated mouth shut, when to avoid air make relay protector misoperation.
3.5.1.4 when operating for dc power supply, power supply must be on the positive side of mercury in receiving contact, lest produce arcing in the contact disconnected.
Installation position of the fuel injection 3.5.1.5 accident, should pay attention to the accident when the discharge of oil does not endanger other electric equipment; Spray pipe mouth should be to cut the "ten" yu line of glass, so that a failure occurs flow smoothly to break the glass.
3.5.2 moistureproof respirator installation:
3.5.2.1 moistureproof respirator before the installation, should check whether the silica gel is failure, if failed, should be in 115 ~ 120 ° temperature bake in oven for 8 hours, make its recovery or update. Become the light red light blue silica gel, namely has failed; White silica gel, shall bake without identification.
3.5.2.2 moistureproof respirator when installation, respirator lid rubber MATS must be removed, the unobstructed, and below the isolation devices containing proper amount of transformer oil, dust filtering effect.
3.5.3 thermometer installed:
3.5.3.1 casing installation, thermometer should be installed directly on the transformer cover the reserved hole, and properly transformer oil in the hole. Scale direction should be easy to check.
3.5.3.2 electric contact thermometer should be done before installation check, oil-immersed transformer is a device shall be installed within the transformer top thermometer on the sleeve, and add appropriate transformer oil. Secondary instrument on the reserve board on one side of the transformer. A dry type transformer components should be according to the manufacturer manual installation location, secondary instrument installed in easy view on the side of the transformer protection net bar. Hose shall not have flat or curved curved radius is less than 50 mm, spare parts should be disc ring and fixed in the vicinity of a thermometer.
3.5.3.3 dry type transformer resistance thermometer, a component should be embedded in the transformer, secondary instrument shall be installed duty room or operating table, conductor shall conform to the requirements of the instrument, and check the appropriate additional resistance to debug the rear can use.
The installation of 3.5.4 voltage switch:
3.5.4.1 transformer voltage switching device contact and coil of wire should be tighten right, good and close contact. Turning point should correctly in various positions, and in accordance with the position.
3.5.4.2 voltage switching device of rod, the tap of the CAM, small shaft pin should be intact; Rotating disc should be flexible, good seal.
3.5.4.3 voltage switching devices of the transmission mechanism (including fixed on-load voltage regulating device) should be stable, transmission mechanism of the friction part should have enough oil.
3.5.4.4 switch on-load voltage regulating device of exchanging the switch contacts and copper braid cord should be intact, the contact between should have enough pressure (generally for 8 ~ 10 kg).
3.5.4.5 switch on-load voltage regulating device rotation to the limit position, should be equipped with mechanical interlock and electric interlock with limit switch.
3.5.4.6 switch on-load voltage regulating device of the control box generally should be installed on the duty room or operating table, the wire should be correct, and should be adjusted, manual and automatic work, gear indicator is correct.
3.5.4.7 voltage switching device for checking and adjusting, hoisted out of exposed to the air time should comply with the provisions of the table 2-26.
Regulating switch device Lou empty time table 2-26
The environment temperature (℃) > > > 0 0 0 < 0
Air relative humidity (%) below 65, 65 ~ 65, 75 ~ 85 does not control
Duration of no more than 24 16 October 8 (h)
2.6.2 transformer wires.
3.5.5.1 transformer of the primary and secondary wire, ground wire, control line shall comply with the provisions of the relevant chapters.
3.5.5.2 transformer primary and secondary lead construction, should not make the transformer bushing directly under stress (FIG. 2-67);
3.5.5.3 transformer zero line and the neutral point grounding line work, should be equipped. Work with zero line should be insulated wires.
3.5.5.4 transformer neutral point grounding loop, near the transformer, should make a detachable connection point.
3.5.5.5 oil-immersed transformer accessories control wires, insulated wires with oil resistant performance should be adopted. Close to the walls of wire, the application of metal hose protection, and neatly, junction box should be sealed well.
Lift 3.6 transformer core inspection and commissioning test:
3.6.1 core transformer hanging check:
3.6.1.1 transformer installation should be done before hanging core tests. Factory has special regulations, under the 1000 kva, no abnormal conditions in the process of transportation, short-distance transport, participated in the factory inspection and conform to the provisions in advance and confirm the condition of the injured in the process of transportation, don't do core.
3.6.1.2 hanging core inspection should be in the temperature is not lower than 0 ℃, core temperature is not lower than the surrounding air temperature, air relative humidity is not more than 75% under the condition of body exposed to the air time (no more than 16 h).
3.6.1.3 all bolts should be tightened, and should be loose prevention measures. Core deformation, surface paint layer is good, the iron core were good.
3.6.1.4 insulation of wire coil shall be complete, the surface defects such as no discoloration, embrittlement, breakdown. High and low voltage coil without moving displacement.
3.6.1.5 between coil, coil and iron core, insulation layer between the core and yoke iron should be complete without loose.
3.6.1.6 lead insulation good, bandage fastening without break, lead wire fixation should be solid and reliable, and its fixed stent should be tightened, lead wire connected to the casing, well connected closely, lead wire connection is correct.
3.6.1.7 all reach should wear heart bolt connection fastening. Wear heart bolt is measured with a shaking table with iron core and yoke iron, as well as the core and the insulation resistance between the yoke iron, and pressure test of 1000 v.
3.6.1.8 oil should be smooth, clean oil dirties debris at the bottom of the tank, oil tank wall without rust.
3.6.1.9 core after everything checked out, application to unqualified transformer oil flushing, and from the bottom of the oil plug put clean the oil. Lifting the core process, the core and the walls should not be collision.
3.6.1.10 core after check if there is no exception, should immediately reset the core and oil to normal. Core, reset, oil must be completed within 16 h.
3.6.1.11 hanging core inspection is completed, to the sealing oil system to conduct a comprehensive check, can not have the spill oil leakage phenomenon.
3.6.2 transformer commissioning test:
3.6.2.1 transformer of commissioning test shall be conducted by the consent of the local power supply department laboratory. Test standards should comply with the specification requirements, the local power supply department and the requirements of the product's technical data.
3.6.2.2 transformer commissioning test content:
A measurement winding along with the dc resistance of casing;
B. check all tap transformer ratio;
C check the three-phase transformer connection groups and the polarity of the single-phase transformer lead;
D measuring winding along with the casing of the insulation resistance, absorptance or polarization index;
E measuring winding along with the casing of the dielectric loss Angle tangent value tg delta;
F dc leakage current measuring winding along with casing;
G winding along with ac withstand voltage test of casing;
H winding along with the casing of the partial discharge test;
I survey and core insulation of various fasteners and iron core earthing line leads to casing on the shell of the insulation resistance;
J not pure porcelain casing test;
K insulating oil test;
L switch on-load voltage regulating device inspection and test;
M rated voltage under impact closing test;
N check phase;
O measurement noise.
3.7 the transformer before sending check:
3.7.1 transformer before commissioning should make comprehensive inspection, confirmed that comply with the requirements for commissioning shall be put into operation.
3.7.2 transformer before commissioning, must be inspection by quality supervision department.
3.7.3 transformer before commissioning check content:
3.7.3.1 handover testing documents is complete, the data conform to the requirements.
3.7.3.2 transformer should be clean, wipe clean, there is no legacy of tectum of sundry, ontology and accessories without defect, and no oil leakage.
3.7.3.3 transformer primary and secondary phase lead right, good insulation.
3.7.3.4 ground wire is good.
3.7.3.5 ventilation installation, normal work, the accident of drainage facilities in good condition; Fire control facilities complete.
3.7.3.6 oil-immersed transformer oil system of the throttle should be open, throttle instructions correctly, oil level is normal.
3.7.3.7 oil-immersed transformer voltage switching device and dry type transformer tap position to place normal voltage notch.
3.7.3.8 protection setting values conform to specified requirements; Normal operation and joint test.
3.7.3.9 dry type transformer railings installed. All kinds of signs, lock the door.
3.8 the transformer power commissioning acceptance:
3.8.1 sending commissioning:
3.8.1.1 transformer input for the first time, but all brake pressure shock, shock when closing generally by the high side.
3.8.1.2 transformer for the first time after the electricity, the duration should not be less than 10 min, no exceptions.
3.8.1.3 transformer should be 3 ~ 5 times total pressure impact closing, there is no abnormal situation, excitation inrush current should not cause the protection misoperation.
After 3.8.1.4 oil-immersed transformer charged, check the oil system should have oil leakage phenomenon.
3.8.1.5 transformer commissioning must pay attention to the impact current, no-load current, the primary and secondary voltage and temperature. And make detailed records.
Before 3.8.1.6 transformer parallel operation, should check the good aspect.
3.8.1.7 transformer no-load running 24 h, without exception, can input load operation.
3.8.2 acceptance:
Charged began 3.8.2.1 transformer, 24 h after no abnormal situation, should go through the formalities of acceptance.
3.8.2.2 acceptance, shall be handed over to the following information and documents:
A) change design;
B) product specifications, test report, certificate of approval and installation drawings and other technical documents;
C) installation check and adjust the record.
4 quality standards
4.1 ensure projects:
4.4.1 power transformer and its accessories test adjustment and body check result, must comply with the rules and regulations of construction.
Inspection method: inspect installation and debugging.
4.1.2 parallel operation of the transformer shall conform to the equal conditions.
Methods: the measured or check record.
4.1.3 high-low voltage porcelain surface are strictly forbidden to have flaws such as crack defect and enamels damage.
Inspection method: to observe the examination.
4.2 the basic items:
2 transformer ontology installation shall meet the following requirements:
4.2.1.1 position accurately, the amount of oil, oil, accurate, clear oil level is normal; Tank no oil leakage phenomenon, the wheel fixed and reliable; Shock is firm and reliable, clean body surface, the paint intact.
4.2.1.2 equipped with gas relay transformer lid, along the flow direction of the gas relay has 1% ~ 1.5% higher slope.
Methods: to observe the inspection and test or inspection installation records.
4.2.2 transformer accessories installation shall meet the following requirements:
4.2.2.1 attachments directly connected to the tank interior clean, installation is firm, connect closely, no oil leakage phenomenon.
4.2.2.2 thermometer to thin tube bending radius should not less than 50 mm, and the pipe without flattening and sharply kinked phenomenon, long capillary part set up, bulb casing oil filled full.
4.2.2.3 load switches have good lubrication performance of the transmission parts, movements flexible and accurate.
4.2.2.4 attachment between the tank and pipe connection of washer, and lead tidy and beautiful.
Inspection method: to observe the inspection and check the installation records.
Holdings of the transformer and line connection shall meet the following requirements:
4.2.3.1 compact connection, connection bolt locking device is complete, the porcelain sleeve is not affected by external forces.
4.2.3.2 zero down the body connected to the path of the grounding device, fixation.
4.2.3.3 body connection between the attachment of wire protection tube, protection tube, junction box, fixation, lifted the lid is complete.
4.2.3.4 to transformer bus and stand, wire protection tube and zero line, etc. Shall be easy to remove, do not interfere with the mobile transformer maintenance. All or move the bolt thread nut 2 ~ 3 buckle, protecting tube color is consistent, anticorrosive complete.
4.2.3.5 transformer and its accessories shell and other non charged metal components are connected to, and conform to the requirements of the relevant chapters.
Inspection method: to observe the examination
5 finished product protection
5.1 transformer should lock the door, without permission by the installation contractor, other personnel must not enter.
5.2 to put in place of high and low voltage transformer porcelain bushing and epoxy resin casting, should be hit and collision prevention measures.
5.3 the transformer body to keep clean, the paint has collision damage. After dry type transformer is in place, to take protective measures, to prevent iron into the coil.
5.4 above the transformer operation, the operator shall be stamped on the transformer, and tool bag, in case of tool material drop down smashing, parts of the transformer.
5.5 transformer oil, oil leakage should be handled in time, prevent the oil level is too low, moisture intrusion, reduce coil insulation level.
5.6 to install electrical pipeline and its bracket should pay attention to protect, not collision damage.
5.7 above the transformer operating welding, should make comprehensive protection for the transformer, to prevent the welding slag falls off, damage to equipment.
6 should pay attention to quality problems
6.1 the transformer installation should pay attention to the quality problems and control measures of see table 2-27.
7 should possess the quality of the record
7.1 product certification.
7.2 products technical documents.
7.2.1 products factory test report.
7.2.2 the product installation instructions.
7.3 equipment material receiving inspection records.
7.4 body check record.
7.5 commissioning test report.
Transformer installation should pay attention to quality problems and control measures - 27 in table 2
The quality problem of the serial number is easy to produce for prevention measures
Iron welding slag cleaning not net, rust removing impurities, uneven brush paint, brush leakage phenomenon
2 earthquake resisting device installation not firm to strengthen the understanding of earthquake prevention, in accordance with the standards for the construction process
Improve quality consciousness, the pipeline according to the specification requirement of CARDS, one horizontal rows
4 transformer one or two porcelain porcelain bushing in transformer handling the casing damage to the installed protection should be strengthened
Transformer neutral point, the zero line and the neutral point grounding line, study in the Beijing area is not separated from installation standard, with reference to the electrical construction of atlas
Transformer primary and secondary lead, bolt is not tight, press not firm pressure. Mother band and transformer connection clearance do not conform to the requirements of the specification quality awareness, strengthen mutual inspection, the mother band and transformer connection should be smooth
7 transformer accessories after installation, accessories installed with oil leakage phenomenon, should be good sealing ring, bolts should be tightened
7.6 installation since the inspection records.
7.7 design changes regarding the record.
7.8 commissioning records.
7.9 the steel material.
7.10 preview records.
7.11 kinds of construction quality assessment record.
1 scope
The technology standard is applicable to general industrial and civil building electric installation engineering 10 kv and below the indoor transformer installation.
2 construction preparation
2.1 equipment and materials requirements:
2.1.1 transformer shall be fitted with nameplates. Nameplate shall indicate the name of manufacturer, rated capacity, a secondary rated voltage, current, impedance voltage % and wiring group and other technical data.
2.1.2 the capacity of transformer, the specification and model number must comply with the design requirements. Complete accessories, spare parts, and have the factory certificate of approval and technical documents.
2.1.3 discharge test PC value and the dry type transformer noise tester dB (A) values should comply with the design and standard requirement.
2.1.4 dry type transformer with a protective cover, shield and the distance of the transformer shall conform to the provisions of the standard, not less than the size of the table 2-23.
2.1.5 sections: various specifications steel should comply with the design requirements, and no obvious corrosion.
2.1.6 bolt: in addition to the anchor bolt and shockproof device bolt, all should use galvanized bolt, and the corresponding flat washer and spring mattress.
2.1.7 other materials: snakeskin tube, oil resistant plastic pipe, welding electrode, antirust paint, mixed paint and transformer oil, all should comply with the design requirements, and product certification.
2.2 the main equipment:
2.2.1 handling hoisting tool: crane, cars, hoist, crane township, three steps, sleeper, wire rope, band rope, rollarounds.
2.2.2 installation tools, bench drill, grinding wheel, electric welding machine, welding tools, electric hammer, vise, live wrench, hammer, set of wire plate.
2.2.3 test apparatus, steel tape, steel ruler, levels, lines, shaking table, multimeter, bridge and test instrument.
2.3 operation conditions:
2.3.1 construction drawing and technical data are complete and correct.
2.3.2 basic civil engineering construction, elevation, size, structure and embedded parts welding strength meet the design requirements.
2.3.3 transformer installed orbit, and comply with the design requirements (note: this work should be done by the built on, install units fit).
2.3.4 walls, roof, shotcrete, no leaking roof, Windows and doors and glass installation intact.
2.3.5 end of indoor ground engineering, site is clean, the roads.
2.3.6 installation of dry type transformer should be no dust, indoor relative humidity should be kept below 70%.
3 operation process
3.1 process:
The equipment point check pieces - transformer secondary handling - transformer to attachment installation, stability
Lift transformer core inspection and acceptance trial run - check before sending - sending acceptance
3.2 equipment point check:
3.2.1 equipment point check pieces shall be installed by the unit, delivery unit, in conjunction with the construction unit representatives, and make records.
3.2.2 according to equipment list, check the transformer equipment technical documents and construction drawings ontology and accessories of the specifications of the spare parts model conformed to the drawings requirements. Whether complete, the presence of loss and damage.
3.2.3 transformer appearance inspection, no damage and deformation of ontology, the paint in good condition without damage.
3.2.4 closed tank is good, do you have any oil leakage, oil leakage phenomenon, the oil standard oil level is normal, found that the problem should be dealt with immediately.
3.2.5 insulation porcelain and epoxy resin casting with and without damage, defects and cracks.
3.3 the transformer secondary handling:
3.1.1 transformer secondary handling by lifting work, should be an electrician to cooperate. Had better use mobile crane hoisting, also can use chain hoist, lifting distance is longer than the best car transport, transport must use wire rope fixed firmly, and be smooth road, to minimize the vibration; Short distance and good roads, hoist, rollarounds transportation available. Transformer weight and lifting height can be reference table for 2-24-25 and table 2.
Resin casting dry-type transformer weight table 2-24
The serial number capacity (kVA) weight (t)
1 100 ~ 200 0.71 ~ 0.92
2 1.16 ~ 1.90 of 250 ~ 500
3 2.08 ~ 2.73 of 630 ~ 1000
4 3.39 ~ 4.22 of 1250 ~ 1600
5.14 ~ 6.30 5, 2000 ~ 2000
Oil-immersed power transformer weight table 2 to 25
Serial number capacity (kVA) total weight lifting point (m) high (t)
1
2
3
4
5
6, 100-100
200 ~ 420
500 ~ 630
750 ~ 800
1000 ~ 1250
0.6 ~ 1.0 of 1600 ~ 1800
1.0 ~ 1.8
2.0 ~ 2.8
3.0 ~ 3.8
3.5 ~ 4.6
5.2 ~ 6.1 3.0 ~ 3.2
3.2 ~ 3.5
3.8 ~ 4.0
5.0
5.2
5.2 ~ 5.8
3.3.2 rainfall distribution on 10-12 transformer, lifting rigging must check unqualified, wire rope must be hung on the hook of tank, the rings only for lifting the core plate, shall not use the rings lifting the whole transformer (FIG. 2-63).
3.3.3 transformer handling, should pay attention to protect porcelain, had better use wooden cases or cover the cartons will be high and low voltage porcelain, so that it is not damaged.
3.3.4 transformer in the process of handling; There should be no shock or severe shocks, the use of mechanical drawing, drawing the focus should be on the transformer under the gravity, in case of inclined transportation Angle should not exceed 15 °, prevent the internal structure deformation.
3.3.5 with dry jin bumps up large transformer, jack should be placed in a tank of special parts.
3.3.6 large transformer before handling or loading and unloading, should check the direction of high and low pressure side, in order to avoid changing direction when installation difficulties.
3.4 the transformer unsteady loading:
3.4.1 track transformer in place available car hanging directly thrown into the transformer room, or use the sleeper erection of temporary orbit, with three steps, chain hoist crane to temporary orbit, and then use practice into indoor place.
3.4.2 transformer in place, we should pay attention to its azimuth and away from the wall size should be consistent with the drawings, the margin of error of plus or minus 25 mm, drawing without annotation, longitudinal according to orbit position, horizontal distance should not be less than 800 mm, is apart from the door should not be less than 1000 mm, and proper care of the house is located in the center of the transformer, the rings of the vertical for core, dry type transformer, and indicate the installation drawings, the installation and maintenance of the minimum distance environment should conform to the requirements of the FIG. 2-64.
Based track should be rule 3.4.3 transformer, track and wheel base should cooperate, equipped with gas relay in transformer, should make its roof along the gas relay steam flow direction with the rise of 1% ~ 1.5% gradient (except of factory regulations do not need to install slope).
3.4.4 transformer width propulsion, low voltage side should be outward; On a narrow face advancing, oil conservator side should be outward. In the case of a switch, the operating direction above 1200 mm width shall be maintained.
3.4.5 oil-immersed transformer of the installation, should consider to in the case of a charged, easy to check the oil pillow and casing of the oil level and top oil temperature, gas relay, etc.
3.4.6 transformer of roller, roller should be flexible rotation, after the transformer is in place, roller should be fixed in the braking device can dismantle.
3.4.7 transformer installation earthquake resistance measures should be taken (steady in the transformer on the concrete floor installation as shown in figure 2-65, a concrete rail beam breadth surface propulsion transformer installation see (FIG. 2-66).
3.5 the attachment installation:
Gas relay in 3.5.1 track of installation:
3.5.1.1 gas relay before installation should via inspection appraisal:
3.5.1.2 gas relay should be installed, the window should be installed in the side for easy check, direction of the arrow should point to the oil pillow, and the communicating pipe connection should be properly sealed. Containment between valve should be located in the oil conservator and gas relay.
3.5.1.3 play open gas mouth, let out the air, until the oil spill will be deflated mouth shut, when to avoid air make relay protector misoperation.
3.5.1.4 when operating for dc power supply, power supply must be on the positive side of mercury in receiving contact, lest produce arcing in the contact disconnected.
Installation position of the fuel injection 3.5.1.5 accident, should pay attention to the accident when the discharge of oil does not endanger other electric equipment; Spray pipe mouth should be to cut the "ten" yu line of glass, so that a failure occurs flow smoothly to break the glass.
3.5.2 moistureproof respirator installation:
3.5.2.1 moistureproof respirator before the installation, should check whether the silica gel is failure, if failed, should be in 115 ~ 120 ° temperature bake in oven for 8 hours, make its recovery or update. Become the light red light blue silica gel, namely has failed; White silica gel, shall bake without identification.
3.5.2.2 moistureproof respirator when installation, respirator lid rubber MATS must be removed, the unobstructed, and below the isolation devices containing proper amount of transformer oil, dust filtering effect.
3.5.3 thermometer installed:
3.5.3.1 casing installation, thermometer should be installed directly on the transformer cover the reserved hole, and properly transformer oil in the hole. Scale direction should be easy to check.
3.5.3.2 electric contact thermometer should be done before installation check, oil-immersed transformer is a device shall be installed within the transformer top thermometer on the sleeve, and add appropriate transformer oil. Secondary instrument on the reserve board on one side of the transformer. A dry type transformer components should be according to the manufacturer manual installation location, secondary instrument installed in easy view on the side of the transformer protection net bar. Hose shall not have flat or curved curved radius is less than 50 mm, spare parts should be disc ring and fixed in the vicinity of a thermometer.
3.5.3.3 dry type transformer resistance thermometer, a component should be embedded in the transformer, secondary instrument shall be installed duty room or operating table, conductor shall conform to the requirements of the instrument, and check the appropriate additional resistance to debug the rear can use.
The installation of 3.5.4 voltage switch:
3.5.4.1 transformer voltage switching device contact and coil of wire should be tighten right, good and close contact. Turning point should correctly in various positions, and in accordance with the position.
3.5.4.2 voltage switching device of rod, the tap of the CAM, small shaft pin should be intact; Rotating disc should be flexible, good seal.
3.5.4.3 voltage switching devices of the transmission mechanism (including fixed on-load voltage regulating device) should be stable, transmission mechanism of the friction part should have enough oil.
3.5.4.4 switch on-load voltage regulating device of exchanging the switch contacts and copper braid cord should be intact, the contact between should have enough pressure (generally for 8 ~ 10 kg).
3.5.4.5 switch on-load voltage regulating device rotation to the limit position, should be equipped with mechanical interlock and electric interlock with limit switch.
3.5.4.6 switch on-load voltage regulating device of the control box generally should be installed on the duty room or operating table, the wire should be correct, and should be adjusted, manual and automatic work, gear indicator is correct.
3.5.4.7 voltage switching device for checking and adjusting, hoisted out of exposed to the air time should comply with the provisions of the table 2-26.
Regulating switch device Lou empty time table 2-26
The environment temperature (℃) > > > 0 0 0 < 0
Air relative humidity (%) below 65, 65 ~ 65, 75 ~ 85 does not control
Duration of no more than 24 16 October 8 (h)
2.6.2 transformer wires.
3.5.5.1 transformer of the primary and secondary wire, ground wire, control line shall comply with the provisions of the relevant chapters.
3.5.5.2 transformer primary and secondary lead construction, should not make the transformer bushing directly under stress (FIG. 2-67);
3.5.5.3 transformer zero line and the neutral point grounding line work, should be equipped. Work with zero line should be insulated wires.
3.5.5.4 transformer neutral point grounding loop, near the transformer, should make a detachable connection point.
3.5.5.5 oil-immersed transformer accessories control wires, insulated wires with oil resistant performance should be adopted. Close to the walls of wire, the application of metal hose protection, and neatly, junction box should be sealed well.
Lift 3.6 transformer core inspection and commissioning test:
3.6.1 core transformer hanging check:
3.6.1.1 transformer installation should be done before hanging core tests. Factory has special regulations, under the 1000 kva, no abnormal conditions in the process of transportation, short-distance transport, participated in the factory inspection and conform to the provisions in advance and confirm the condition of the injured in the process of transportation, don't do core.
3.6.1.2 hanging core inspection should be in the temperature is not lower than 0 ℃, core temperature is not lower than the surrounding air temperature, air relative humidity is not more than 75% under the condition of body exposed to the air time (no more than 16 h).
3.6.1.3 all bolts should be tightened, and should be loose prevention measures. Core deformation, surface paint layer is good, the iron core were good.
3.6.1.4 insulation of wire coil shall be complete, the surface defects such as no discoloration, embrittlement, breakdown. High and low voltage coil without moving displacement.
3.6.1.5 between coil, coil and iron core, insulation layer between the core and yoke iron should be complete without loose.
3.6.1.6 lead insulation good, bandage fastening without break, lead wire fixation should be solid and reliable, and its fixed stent should be tightened, lead wire connected to the casing, well connected closely, lead wire connection is correct.
3.6.1.7 all reach should wear heart bolt connection fastening. Wear heart bolt is measured with a shaking table with iron core and yoke iron, as well as the core and the insulation resistance between the yoke iron, and pressure test of 1000 v.
3.6.1.8 oil should be smooth, clean oil dirties debris at the bottom of the tank, oil tank wall without rust.
3.6.1.9 core after everything checked out, application to unqualified transformer oil flushing, and from the bottom of the oil plug put clean the oil. Lifting the core process, the core and the walls should not be collision.
3.6.1.10 core after check if there is no exception, should immediately reset the core and oil to normal. Core, reset, oil must be completed within 16 h.
3.6.1.11 hanging core inspection is completed, to the sealing oil system to conduct a comprehensive check, can not have the spill oil leakage phenomenon.
3.6.2 transformer commissioning test:
3.6.2.1 transformer of commissioning test shall be conducted by the consent of the local power supply department laboratory. Test standards should comply with the specification requirements, the local power supply department and the requirements of the product's technical data.
3.6.2.2 transformer commissioning test content:
A measurement winding along with the dc resistance of casing;
B. check all tap transformer ratio;
C check the three-phase transformer connection groups and the polarity of the single-phase transformer lead;
D measuring winding along with the casing of the insulation resistance, absorptance or polarization index;
E measuring winding along with the casing of the dielectric loss Angle tangent value tg delta;
F dc leakage current measuring winding along with casing;
G winding along with ac withstand voltage test of casing;
H winding along with the casing of the partial discharge test;
I survey and core insulation of various fasteners and iron core earthing line leads to casing on the shell of the insulation resistance;
J not pure porcelain casing test;
K insulating oil test;
L switch on-load voltage regulating device inspection and test;
M rated voltage under impact closing test;
N check phase;
O measurement noise.
3.7 the transformer before sending check:
3.7.1 transformer before commissioning should make comprehensive inspection, confirmed that comply with the requirements for commissioning shall be put into operation.
3.7.2 transformer before commissioning, must be inspection by quality supervision department.
3.7.3 transformer before commissioning check content:
3.7.3.1 handover testing documents is complete, the data conform to the requirements.
3.7.3.2 transformer should be clean, wipe clean, there is no legacy of tectum of sundry, ontology and accessories without defect, and no oil leakage.
3.7.3.3 transformer primary and secondary phase lead right, good insulation.
3.7.3.4 ground wire is good.
3.7.3.5 ventilation installation, normal work, the accident of drainage facilities in good condition; Fire control facilities complete.
3.7.3.6 oil-immersed transformer oil system of the throttle should be open, throttle instructions correctly, oil level is normal.
3.7.3.7 oil-immersed transformer voltage switching device and dry type transformer tap position to place normal voltage notch.
3.7.3.8 protection setting values conform to specified requirements; Normal operation and joint test.
3.7.3.9 dry type transformer railings installed. All kinds of signs, lock the door.
3.8 the transformer power commissioning acceptance:
3.8.1 sending commissioning:
3.8.1.1 transformer input for the first time, but all brake pressure shock, shock when closing generally by the high side.
3.8.1.2 transformer for the first time after the electricity, the duration should not be less than 10 min, no exceptions.
3.8.1.3 transformer should be 3 ~ 5 times total pressure impact closing, there is no abnormal situation, excitation inrush current should not cause the protection misoperation.
After 3.8.1.4 oil-immersed transformer charged, check the oil system should have oil leakage phenomenon.
3.8.1.5 transformer commissioning must pay attention to the impact current, no-load current, the primary and secondary voltage and temperature. And make detailed records.
Before 3.8.1.6 transformer parallel operation, should check the good aspect.
3.8.1.7 transformer no-load running 24 h, without exception, can input load operation.
3.8.2 acceptance:
Charged began 3.8.2.1 transformer, 24 h after no abnormal situation, should go through the formalities of acceptance.
3.8.2.2 acceptance, shall be handed over to the following information and documents:
A) change design;
B) product specifications, test report, certificate of approval and installation drawings and other technical documents;
C) installation check and adjust the record.
4 quality standards
4.1 ensure projects:
4.4.1 power transformer and its accessories test adjustment and body check result, must comply with the rules and regulations of construction.
Inspection method: inspect installation and debugging.
4.1.2 parallel operation of the transformer shall conform to the equal conditions.
Methods: the measured or check record.
4.1.3 high-low voltage porcelain surface are strictly forbidden to have flaws such as crack defect and enamels damage.
Inspection method: to observe the examination.
4.2 the basic items:
2 transformer ontology installation shall meet the following requirements:
4.2.1.1 position accurately, the amount of oil, oil, accurate, clear oil level is normal; Tank no oil leakage phenomenon, the wheel fixed and reliable; Shock is firm and reliable, clean body surface, the paint intact.
4.2.1.2 equipped with gas relay transformer lid, along the flow direction of the gas relay has 1% ~ 1.5% higher slope.
Methods: to observe the inspection and test or inspection installation records.
4.2.2 transformer accessories installation shall meet the following requirements:
4.2.2.1 attachments directly connected to the tank interior clean, installation is firm, connect closely, no oil leakage phenomenon.
4.2.2.2 thermometer to thin tube bending radius should not less than 50 mm, and the pipe without flattening and sharply kinked phenomenon, long capillary part set up, bulb casing oil filled full.
4.2.2.3 load switches have good lubrication performance of the transmission parts, movements flexible and accurate.
4.2.2.4 attachment between the tank and pipe connection of washer, and lead tidy and beautiful.
Inspection method: to observe the inspection and check the installation records.
Holdings of the transformer and line connection shall meet the following requirements:
4.2.3.1 compact connection, connection bolt locking device is complete, the porcelain sleeve is not affected by external forces.
4.2.3.2 zero down the body connected to the path of the grounding device, fixation.
4.2.3.3 body connection between the attachment of wire protection tube, protection tube, junction box, fixation, lifted the lid is complete.
4.2.3.4 to transformer bus and stand, wire protection tube and zero line, etc. Shall be easy to remove, do not interfere with the mobile transformer maintenance. All or move the bolt thread nut 2 ~ 3 buckle, protecting tube color is consistent, anticorrosive complete.
4.2.3.5 transformer and its accessories shell and other non charged metal components are connected to, and conform to the requirements of the relevant chapters.
Inspection method: to observe the examination
5 finished product protection
5.1 transformer should lock the door, without permission by the installation contractor, other personnel must not enter.
5.2 to put in place of high and low voltage transformer porcelain bushing and epoxy resin casting, should be hit and collision prevention measures.
5.3 the transformer body to keep clean, the paint has collision damage. After dry type transformer is in place, to take protective measures, to prevent iron into the coil.
5.4 above the transformer operation, the operator shall be stamped on the transformer, and tool bag, in case of tool material drop down smashing, parts of the transformer.
5.5 transformer oil, oil leakage should be handled in time, prevent the oil level is too low, moisture intrusion, reduce coil insulation level.
5.6 to install electrical pipeline and its bracket should pay attention to protect, not collision damage.
5.7 above the transformer operating welding, should make comprehensive protection for the transformer, to prevent the welding slag falls off, damage to equipment.
6 should pay attention to quality problems
6.1 the transformer installation should pay attention to the quality problems and control measures of see table 2-27.
7 should possess the quality of the record
7.1 product certification.
7.2 products technical documents.
7.2.1 products factory test report.
7.2.2 the product installation instructions.
7.3 equipment material receiving inspection records.
7.4 body check record.
7.5 commissioning test report.
Transformer installation should pay attention to quality problems and control measures - 27 in table 2
The quality problem of the serial number is easy to produce for prevention measures
Iron welding slag cleaning not net, rust removing impurities, uneven brush paint, brush leakage phenomenon
2 earthquake resisting device installation not firm to strengthen the understanding of earthquake prevention, in accordance with the standards for the construction process
Improve quality consciousness, the pipeline according to the specification requirement of CARDS, one horizontal rows
4 transformer one or two porcelain porcelain bushing in transformer handling the casing damage to the installed protection should be strengthened
Transformer neutral point, the zero line and the neutral point grounding line, study in the Beijing area is not separated from installation standard, with reference to the electrical construction of atlas
Transformer primary and secondary lead, bolt is not tight, press not firm pressure. Mother band and transformer connection clearance do not conform to the requirements of the specification quality awareness, strengthen mutual inspection, the mother band and transformer connection should be smooth
7 transformer accessories after installation, accessories installed with oil leakage phenomenon, should be good sealing ring, bolts should be tightened
7.6 installation since the inspection records.
7.7 design changes regarding the record.
7.8 commissioning records.
7.9 the steel material.
7.10 preview records.
7.11 kinds of construction quality assessment record.
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