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Changchun Sanding transformer Co., LTD
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Changchun Sanding transformer Co., LTD
0431-86147611
  • Place of shipment Changchun Economic and Technological Development Zone
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  • Mode: Manufacturer, Trader
  • Capital: 50 million RMB
  • Type: Business Unit (Manufacturer, Trader)
  • Main: Domestic leading high-voltage and ultra-high-voltage electrical equipment manufacturers and engineering service providers
  • Area: Changchun City/Economic and Technological Development Zone
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The information on this page is provided by Changchun Sanding Transformer Co., LTD. 220kV oil-immersed transformer"Product information, if you want to know more about" 220kV oil-immersed transformer "price, model, manufacturer, please contact the manufacturer, or leave a message to the manufacturer.
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Renewal 2020-09-09 09:03

220kV oil-immersed transformer

The 220kV oil-immersed power transformer produced by our company is developed on the basis of digesting and absorbing advanced technology at home and abroad, for the characteristics of China's urban and rural power grid, and its product performance indicators are better than GB/T6451 "three-phase oil-immersed power transformer technical parameters and requirements", fully in line with JB/T3837-1996 "Transformer product model preparation Method" and GB10941-1996; Gb10994.2-1996; Gb10994.3-2003; GB1094.4-2005; Gb10994.5-2003 "Power transformer" manufacturing standard and the International Electrotechnical Commission recommended standard IEC60076. This series of products has the outstanding characteristics of low loss, low noise, no hanging core, and its safety, economy and other aspects have extraordinary innovation, making it become the domestic first-class technology products.

The product mainly has the following characteristics:

Significant energy saving effect

Fuel tank

The tank structure is bell jar type. The box wall is welded with folding plate reinforced iron or plate reinforced iron to improve the mechanical strength of the tank (can withstand vacuum 133Pa, positive pressure 0.1MPa); The sealing part of the tank is specially processed, and the box is treated as a whole by "shot peening" to completely eliminate the oxidation skin on the surface of the box and the sharp corner burr and welding slag produced in the processing. The high-performance two-component paint improves the adhesion of the paint film, making the appearance quality both beautiful and lasting. The heat sink and components are installed and tested in simulated field operation conditions to effectively ensure the elimination of leakage points. All flanges are finished and have slotted and limited structure. At the same time, high quality rubber gaskets with oil resistance, weather resistance and ozone resistance are used to prevent leakage of the transformer. In addition, when dealing with the bolted connection between the upper and lower fuel tanks, the weld sealing structure can also be used according to customer needs.

In short, our company relies on scientific and technological progress, with the help of perfect quality assurance system, through the strong sense of responsibility and the spirit of innovation and fruitful work of all employees, so that the company's products always maintain low office discharge, low noise, low loss and high reliability.

All the company's in-service oil-immersed power transformer products have not released damage accidents and oil leakage phenomenon. The transformer body is assembled in a completely closed constant temperature and constant pressure purification room, which meets the cleaning requirements of 220kV products and the constant temperature requirements of the body, ensuring the cleanliness and dryness of the body. At the same time, imported kerosene vapor phase drying equipment is used to make the cleanliness of the product better. The lower plate and the upper plate are all made of electrician laminated paperboard with high mechanical strength and good electrical performance. The stays and pads used in the transformer have been densified and chamfered twice to reduce partial discharge. The steel clamp and the steel nail have sufficient strength, and the press bowl made of paper pulp insulation is selected, and the position of the support pad, brace and press nail is made to make the winding force relatively balanced as far as possible, and improve the overall stability of the body. The body adopts the whole set constant pressure drying process to shorten the assembly time after winding stabilization treatment. Adjust the center of each winding as much as possible, fully ensure that the coil reactance height is equal, so that the winding force is uniform, so as to improve the anti-short circuit ability of each winding. In addition, the lower clamp and the lower oil tank, the upper beam and the upper oil tank are all rigid positioning, and the locking is adjusted by the reverse pressure nail. Therefore, the body in the tank can withstand the impact test under various transportation conditions and the axial electric power in operation without displacement.

In addition, the high, low and voltage regulating windings are equipped with oil guiding structures, which reduces the hot spot heating of the winding and prolongs the service life.

The vertical voltage regulating winding (for the load regulating transformer) makes the ampere-turns of each winding more balanced, improves the stability, eliminates the instability deformation, effectively reduces the axial electric force caused by the external short circuit of the transformer, and improves the dynamic stability of the transformer in the case of external fault short circuit.

Local photo of pressing plate and nail

The core lamination adopts 5 step lap structure, and the lamination is 45. All oblique and non-porous lashing structure. The silicon steel sheet is cut by the shear line introduced by Georg Company in Germany, and the shear burr is less than 0.02mm. In addition, the advanced core stacking and turning table, strict stacking and non-prestacking process fully ensure the grain orientation characteristics of the cold-tied silicon steel sheet, and effectively reduce the no-load loss of the transformer. The clamp structure adopts plate clamp, and the magnetic shield is installed on the clamp to reduce the stray loss. The core clamping adopts the special Cigna belt clamping and bunching process imported from the United States, which fully guarantees the degree of clamping of the core. At the same time, years of mature technology, so that the core, pull plate, support beam, foot into a solid whole, to ensure that the core is in a good state of stress, which not only reduces no-load loss, but also greatly reduces noise.

The high, low and voltage regulating winding is wound on the high strength insulating cylinder. The low voltage winding is wound with transposition wire or semi-hard copper wire. The high and voltage regulating winding adopts composite wire and uses the high-strength Denison paper imported from the United States as turn insulation, which improves the filling coefficient of the transformer iron window, reduces the vortex loss and circulation loss of the wire, and improves the short-circuit resistance of the transformer. All windings are equipped with auxiliary bracing (reinforcement bracing) on the inside and locking bracing on the outside. The windings are tightened with a "zero" margin design, wire tightening device is used when winding, and special climbing pad is used at the position, which greatly enhances the mechanical strength and short-circuit resistance of the windings.

The no-load loss is 35% lower than the national standard GB/T6451-1999, and the load loss is 10-20% lower than the national standard.

The high-voltage tap lead is fixed and led to the switch with a support, and the low-voltage lead copper bar is fixed to the iron core clip and the upper plane of the lower oil tank, which improves the stability of the lead, and has the technical requirements and process guarantees of the coil head bundling, fully meeting the requirements of the low office discharge.

Fuel tank

Partial high-pressure side of tank



1. Scope of application

This manual is applicable to the loading and unloading, transportation, storage, installation, operation and maintenance of three-phase oil-immersed distribution transformers with voltage class of 10kV and below produced by our company.

2. Conditions of use


Such transformers are suitable for the following normal working conditions, when the conditions of use are different from the following provisions, should be put forward at the time of ordering, negotiated settlement.

2.1 Altitude:

The altitude does not exceed 1000 meters;

2.2 Ambient Temperature:

High temperature: +40℃

Low temperature: -25℃ (outdoor)

-5℃ (indoor type)

High average daily temperature: +30℃

High average annual temperature: +20℃

2.3 Air relative humidity: < 90% (+25℃)

2.4 The waveform of the power supply voltage should be similar to the sine wave;

2.5 The power supply voltage of the three-phase transformer should be approximately symmetrical;

2.6 The installation site is free of gas, steam, chemical deposition, dust, dirt and other explosive and corrosive media that seriously affect transformer insulation;

2.7 No serious vibration or turbulence occurs at the installation site.

3. Transportation and storage

3.1 Such transformers are all loaded with oil transport, the main mode of transport to the installation site is road or rail transport, the attached parts, accessories and factory technical documents are separately packaged and shipped together with the transformer.

3.2 When lifting the transformer, the four cranes on the wall of the box should be used at the same time, which can bear the total weight of the transformer. The ring on the lid is for the hoist body only.

3.3 When lifting, the Angle between the rope and the vertical line shall not be greater than 30°. If this requirement cannot be met due to the lifting height limitation, the lifting beam shall be used.

3.4 The product must be firmly placed after loading, and it is strictly prohibited to tie and pull high low pressure casing, oil level gauge and other wearing parts to prevent damage to the product.

3.5 During transportation, the tilt of the transformer shall not exceed 15°, and turbulence, collision, vibration and shock are not allowed.

3.6 The product should be handled with care during loading and unloading.

3.7 If the transformer is not installed and put into operation immediately and is stored for a long time, it must be checked for damage and oil leakage. There should be no hanging heavy objects and other unstable debris in the storage place to prevent accidental damage to the casing and corrugated fuel tank.

4. Acceptance

After receiving the transformer, the goods unit should immediately check whether the received products are consistent with the order contract according to the transformer nameplate, and check:

4.1 Whether all technical documents, drawings, products and accessories are complete;

4.2 Whether the transformer has oil leakage or oil seepage;

4.3 Whether the products and parts are damaged;

4.4 Vulnerable parts, such as high and low pressure bushings, oil level gauges, mercury thermometers, etc., are damaged or not.

5. Assembly work precautions

5.1 Do not disassemble the transport transformer, the experience is qualified to do the pre-operation test project;

5.2 Install the transformer of mercury thermometer and temperature indicating controller, and fill the thermometer base with transformer oil;

5.3 When installing the dehumidifier, fill the lower part of the dehumidifier with transformer oil (hanging dehumidifier);

5.4 Assembly of other parts;

5.5 Observe whether the oil level display of the oil level gauge is normal. When it is lower than the normal oil level, qualified transformer oil should be injected. When filling oil, if the corrugated oil tank transformer is used, unscrew the oil filling plug at the upper end of the oil level gauge (remove the pressure release valve for the oil level gauge equipped with a pressure release valve), inject qualified transformer oil until the oil level gauge is fully filled, and then install the oil filling plug or pressure release valve. If there is a transformer with an oil storage tank, open the oil storage tank cap, inject qualified transformer oil, and then screw it on. All bleed plugs must be opened when oil is injected, and then sealed when oil is pumped.

5.6 After injecting transformer oil, seal the gas release plug of the gas relay, casing, etc., and check all sealing surfaces. After parking for 24h, check whether there is oil leakage and oil leakage, and release the gas of the gas relay again;

5.7 When filling transformer oil, it is necessary to pay attention to the brand, origin and oil base of the transformer oil that is filled, and transformer oil of different brands or different oil bases shall not be mixed together. If mixed use, must do compatibility test, qualified before use;

5.8 Take transformer oil sample, and do test and chemical analysis;

5.9 Seal test shall be performed after oil injection. The test method is as follows:

Gas static pressure test, using the oil injection hole at the upper end of the oil level meter, using clean and dry compressed air to do the static pressure test, and maintain 3 hours without oil leakage. Pressure: 13kPa for transformers 315kVA and below, 10kPa for transformers 400kVA and above.

6. Check the core

6.1 This type of transformer generally does not carry out core inspection, when it is found that there is damage to the structure during transportation, serious oil leakage, oil seepage or other special circumstances, the core inspection is carried out;

6.2 Core inspection should be carried out indoors as far as possible, and the indoor should be clean and dry. If it is necessary to inspect the transformer outdoors, special attention should be paid to prevent dust and rain from falling on the transformer to minimize the transformer's moisture;

6.3 When the ambient temperature is lower than or close to the temperature of the transformer body, the core can be checked. If the body temperature is lower than the surrounding air temperature, the core lifting time should be delayed, and proper measures should be taken to raise the body temperature to the same as the surrounding air temperature, so as not to condense the water in the air on the body;

6.4 Try to avoid the core inspection in rainy or foggy days, if necessary, only allowed to be carried out indoors, at this time the indoor temperature is required to be more than 10℃ higher than the outdoor temperature, or the body is heated to more than 10℃ higher than the indoor temperature;

6.5 The time the body stays in the air (the time of contact with the air since the time of oil discharge) shall not exceed the following provisions:

It should not exceed 8h in dry weather when the relative humidity of the air is not more than 65%;

In humid weather where the relative humidity of the air is not more than 75%, it should not exceed 4h;

No core inspection should be carried out in humid weather when the relative humidity of the air is greater than 75%.

6.6 Contents of body inspection:

6.6.1 The fastening bolts of the body should not be loose, and if they are loose, they should be tightened;

6.6.2 Coils and leads should not be loosened, moved or damaged;

6.6.3 Measure the winding insulation resistance to the ground;

6.6.4 The core is well grounded and there is no multi-point grounding;

6.6.5 The inside of the fuel tank is in good cleaning condition with no missing parts or debris;

6.6.6 Check the wiring and contact of the tap changer, and measure the DC resistance of the winding at each tap position.

6.7 Transformer oil should be breakdown voltage test and performance test. The temperature of the oil sample taken from the lower valve of the tank shall not be lower than +50 ° C. If the breakdown voltage of the transformer oil is lower than the standard value, the cause should be identified. If the transformer oil is contaminated and the voltage resistance is reduced, it must be filtered before the transformer is put into operation to increase the breakdown voltage of the transformer oil;

6.8 All faults and damage that have been found should be eliminated during the inspection.

7. Put into operation

7.1 Before the transformer is put into operation, the following test items should be carried out:

7.1.1 Measuring insulation resistance, under normal circumstances shall not be lower than 70% of the factory value (temperature: 10-40℃, humidity ≤70%);

7.1.2 Measuring DC resistance;

7.1.3 External construction frequency withstand voltage test, the withstand voltage value is carried out according to the following table (lasting 1min) :

Rated voltage (RMS)

1kV

3kV

6kV

10kV

15kV

20kV

Factory test value (kV)

5

18

25

35

45

55

Handover test value (kV)

4

15

21

30

38

47

7.1.4 Measure all tap ratios consistent with the nameplate voltage, and the allowable error of the ratio is ±0.4%;

7.1.5 Measure the no-load current and no-load loss of the transformer, and the measured results should not be significantly different from the factory test results (see test report);

The above tests should be carried out at least 10h after the transformer oil injection and static discharge, and the sequence of the above test items should be maintained during the test.

7.2 After the transformer has passed the test items listed in Article 7.1, the following checks shall be carried out:

7.2.1 Setting and testing protection devices, such as gas relays, overcurrent relays, differential relays (if any);

7.2.2 Check the reading of the thermometer;

7.2.3 Check whether there are other irrelevant places in the transformer;

7.2.4 Whether the fuel tank is properly grounded;

7.2.5 Whether the transformer has oil leakage or oil seepage.

7.3 Before the transformer is put into operation, remove the fixing pin of the pressure relief valve on the upper end of the tubular oil level gauge;

7.4 When the transformer equipped with a gas relay is put into trial operation, the signal contact of the gas relay is first connected to the tripping circuit of the transformer, the overcurrent protection is set as instantaneous action, and then the transformer is connected to the rated voltage for 30min, and the transformer is listened to whether there is abnormal sound;

7.5 The transformer should be connected to the power supply side, because the protection device of the transformer is placed on the side, if there is an abnormal situation, cut off the power supply in time;

7.6 If the transformer is connected to the power supply with good test results, it can be loaded and put into operation;

7.7 Before the transformer is put into operation, the tap-changer should be adjusted to the appropriate position according to the transformer nameplate and the grid voltage, such as:

a. If the actual voltage of the local power grid is 10kV, the tap-changer should be connected to the rated gear;

b. When the output voltage is too high, turn the tap-changer up when the power is off;

c. When the output voltage is low, in the case of ensuring power off, the tap-changer is lowered;

For example: when the transformer voltage combination is 10±5%/0.4kV, the rated transmission voltage is 10kV, when the secondary output voltage is high, the switching gear can be adjusted to 1 gear, and vice versa;

7.8 For on-load voltage regulation, please refer to the operation manual of on-load voltage regulation tap-changer. In the case of power failure, the tap-changer can be put into operation only after normal debugging;

7.9 The transformer should be operated in no-load mode, the closing inrush current value can reach 10 times the rated current, and the current quick action protection setting value of the transformer should be greater than the peak inrush current;

7.10 After the transformer is put into operation, the load should be from light to heavy, and check the transformer for abnormal sound, and do not blindly put in a large load;

7.11 Rated operating conditions:

7.11.1 The transformer can be operated according to the nameplate under the specified cooling conditions;

7.11.2 The transformer is not allowed to run for a long time in excess of the rated current on the nameplate;

7.11.3 Under the rated capacity of the transformer, the maximum voltage value shall not exceed 5% of the corresponding tapping voltage;

7.11.4 The allowable temperature of the oil-immersed power transformer in operation is checked according to the upper oil temperature. The allowable value of the upper oil temperature rise is 55K, but the high temperature shall not exceed 95℃. In order to avoid the transformer oil aging too fast, the upper oil temperature should not often exceed 85℃;

7.11.5 When the transformer is in operation, the current exceeds the rated current specified on the nameplate, that is, it is in overload operation, including normal overload operation and accident overload operation. The allowable value of normal overload operation should be determined according to the load curve of the transformer, the temperature of the cooling medium and the load carried by the transformer before overload. For example, if one of several transformers in operation is damaged and there is no spare transformer, the rest of the transformers are allowed to operate according to the accident overload, the allowable value should be carried out according to the GB/T15164 "Oil-immersed Power transformer load Guidelines", and the overload operation should be carried out according to the "Power transformer operation Regulations".

7.11.6 For a transformer whose winding is connected by Yyn0, the neutral current shall not exceed 25% of the rated current of the low-voltage winding.

8. Maintenance, maintenance and use precautions

8.1 The tap-changer must be switched in the non-excited state (see the tap-changer instruction manual for details). In order to eliminate the influence of the oil film on the contact resistance, it is necessary to switch several times and align the required position;

8.2 When lifting or maintaining the transformer, care should be taken to protect the wearing parts (such as bushing, thermometer, oil level gauge, etc.) from damage;

8.3 The grounding screw of the transformer is only used for grounding, shall not be used for it incorrectly, and the grounding must be reliable;

8.4 When the transformer is running, the oil level temperature should be checked frequently to ensure that it does not exceed 95 ° C, and the load must be reduced to the allowable value when it exceeds.

8.5 When the transmission line high voltage drop fuse is burned, do not close immediately, until the cause is found out before closing;

8.6 The transformer in normal operation shall take oil sample for inspection once a year, and its quality shall meet the provisions of the national standard "Transformer Oil Quality Standard in Operation";

8.7 If the transformer makes abnormal sound, the oil level fluctuates from high to low, the oil level is lower than the limit of the oil level line of the oil gauge due to oil leakage in the oil storage tank or serious oil leakage, the operation should be stopped immediately and thorough inspection should be carried out;

8.8 The transformer should always check the temperature indicator and oil level indicator devices and protection devices during operation to ensure that its operation is reliable, and should often check whether there is oil leakage and oil seepage in each seal;

8.9 If the transformer fails, an oil sample should be taken after the accident to determine whether the transformer oil needs to be treated or changed.

9. Safety precautions

9.1 After the transformer is put into operation, the reliability of its grounding system should be strictly checked, and its grounding part should be safe and reliable;

9.2 Before the transformer is installed and put into operation, an isolation fence should be installed around the transformer and warning signs should be hung to avoid accidents;

9.3 The test, installation and maintenance of the transformer must be undertaken by qualified professionals;

9.4 When installing the transformer, the user shall contact the local power department to increase lightning protection, lightning protection facilities and fuse protection around the transformer to avoid damage caused by lightning or overload operation.

10. Troubleshooting common faults

If the transformer has the following fault, the following method can help you quickly solve the general problem, if the fault still can not be eliminated, please contact the dealer or the company.

Fault phenomenon

Inspection site and treatment method

Field test insulation resistance value is low

The relative humidity of the air when measuring the insulation resistance should be < 70%, otherwise the measured insulation resistance is not accurate enough or low, in addition, check the pollution of the porcelain sleeve, such as serious pollution, you can wipe the transformer porcelain sleeve with a dry towel or shield the porcelain sleeve and measure again.

Gas relay misoperation

Check whether the wiring is correct against the gas relay instructions;

Check whether the gas relay buoy reaches the 170ml scale mark;

Check that the gas relay signal contact and trip contact are open (can be directly observed by pressing the probe from the window).

The DC resistance is unbalanced

The unexcited tap-changer can be rotated more than 5 times from low to high, and then the tap-changer positioning pin is inserted into the slot and re-measured.

The temperature of the transformer is too high

Should check whether the transformer overload operation and ventilation conditions are good, smooth (installed indoors), can be measured by current caliper phase.

The three-phase voltage is unstable

Check whether the neutral point of the transformer is firmly grounded, and check whether the external cables of the transformer and the circuit breaker have virtual discharge.


Supplier information

Changchun Sanding Transformer Co., Ltd. is a joint-stock enterprise from the old state-owned enterprise established in 1958 - Changchun Transformer Factory, which was restructured according to relevant national policies, and officially changed its name to Changchun Sanding Transformer Co., Ltd. on February 28, 2003. After decades of development, it has cultivated a large number of leading figures in technology and technology in the same industry, a group of outstanding management talents and first-class enterprise team, and has become a modern management model and advanced equipment

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Company name Changchun Sanding transformer Co., LTD Business model Manufacturers, traders
Registered capital 50 million RMB Company registration time The year 1958
Company location Changchun City/Economic and Technological Development Zone Type of enterprise Business units (manufacturers, traders)
Main industry Electrical and electrical communication enterprises
Main product or service Leading domestic high voltage and ultra-high voltage electrical equipment manufacturers and engineering service providers
Contact information

Changchun Sanding transformer Co., LTD

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