CN203352009U - Oil pressing device for replacing transformer bushing - Google Patents

Abstract

An oil pressure device for replacing transformer bushings, which includes a high-pressure nitrogen cylinder, a flow meter, an inflation valve, a pressure gauge and an inflation tube, one end of the inflation tube is connected to the nitrogen cylinder, and the other end is connected to the booster seat of the transformer bushing The air hole at the top is connected, and the flowmeter, gas filling valve and pressure gauge are connected in turn on the gas charging pipe between the nitrogen cylinder and the rising seat. The utility model uses high-pressure nitrogen to press the transformer oil in the booster seat of the transformer bushing into the oil pillow. When replacing the bushing, it is not necessary to connect the power supply, oil pump, oil pipe, or inflate the capsule oil pillow, which greatly reduces the labor intensity of the maintenance personnel. And the danger of operation, improve the efficiency of maintenance work, reduce the power outage time of the transformer, and also avoid the damage to the sealed environment of the transformer, and ensure the safe operation of the transformer.

Description

An oil pressure device for replacing bushings of transformers

technical field

The utility model relates to a device for pressing transformer oil in a booster seat of a transformer into an oil conservator, which is used when replacing a transformer bushing, and belongs to the technical field of transformers.

Background technique

When the transformer is running, the lower end of its high and low voltage bushings extends into the transformer oil tank from the rising seat and is immersed in the transformer oil. When the bushings are defective or aging and need to be hoisted out for inspection, maintenance and replacement, necessary measures must be taken. Measures to prevent transformer oil from overflowing from the riser. The traditional method of replacing a transformer bushing involves the following steps (see Figure 1):

1. Close the butterfly valve between the oil conservator and the transformer oil tank;

2. Open the air release plug of the raised seat;

3. Open the oil drain valve of the transformer oil tank;

4. Connect and start the oil pump, discharge part of the transformer oil in the transformer oil tank into the oil conservator, so that the oil level of the raised seat drops to near the lower edge of the raised seat;

5. Stop oil discharge and replace the casing;

6. After replacement, open the butterfly valve between the oil conservator and the transformer oil tank, and fill the transformer oil tank with oil;

7. Exhaust after oil filling;

8. Fill the oil pillow capsule with nitrogen and seal it.

There are following deficiencies in this method for changing the transformer bushing:

1. There are many high-altitude operations, which require maintenance personnel to climb on the top of the oil conservator of the transformer for many times, which increases the labor intensity and danger of the maintenance personnel;

2. The sealed environment of the transformer is destroyed, and the transformer oil is in contact with the outside air during the replacement process, which will have a negative impact on the electrical performance and cleanliness of the equipment;

3. The operation is very cumbersome, requiring an external oil pump and power supply; inflating the oil pillow capsule; dismantling the respirator, etc., not only is easy to cause oil leakage, but also the time of oil discharge, oil replenishment, and capsule filling takes up the entire casing replacement time More than half, greatly reducing the work efficiency of replacing the bushing.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the prior art and provide an oil pressure device for easy replacement of transformer bushings, so as to improve the work efficiency of replacing bushings, reduce the labor intensity of maintenance personnel, and ensure the safety of maintenance personnel and transformers.

Problem described in the utility model is realized by the following technical solutions:

An oil pressure device for replacing bushings of transformers, which comprises a high-pressure nitrogen cylinder, a flow meter, a gas charging valve, a pressure gauge and a gas charging tube. One end of the gas charging tube is connected to the nitrogen gas cylinder, and the other end is connected to the transformer bushing. The air hole on the top of the high seat is connected, and the flow meter, gas filling valve and pressure gauge are connected in turn on the gas filling pipe between the nitrogen cylinder and the rising seat.

In the above-mentioned oil pressure device for replacing the transformer bushing, the air hole on the top of the booster seat of the transformer bushing connected to the inflation pipe adopts the installation hole of the air release plug.

The utility model uses high-pressure nitrogen to press the transformer oil in the booster seat of the transformer bushing into the oil pillow. When replacing the bushing, it is not necessary to connect the power supply, oil pump, and oil pipe, and it is not necessary to inflate the capsule oil pillow, which greatly reduces the labor intensity of maintenance personnel. It improves the efficiency of maintenance work, reduces the power outage time of the transformer, avoids damage to the sealed environment of the transformer, and ensures the safe operation of the transformer.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a schematic diagram of an oil discharge device;

Fig. 2 is a schematic structural view of the utility model.

The list of labels in the figure is: 1. Lifting seat; 2. Sleeve; 3. Oil pillow, 4. Pressure gauge, 5. Inflatable valve, 6. Flow meter, 7. Nitrogen cylinder, 8. Butterfly valve, 9. Oil pump 10, oil discharge valve, 11, vent plug, 12, inflation pipe.

Detailed ways

Referring to Fig. 2, the utility model is mainly composed of a pressure gauge 4, an inflation valve 5, a flow meter 6, a nitrogen cylinder 7 and an inflation pipe 12, and the functions of each part are as follows:

Nitrogen cylinder 7: Provide high-pressure, high-purity nitrogen;

Flowmeter 6: Real-time display of dynamic flow and cumulative flow, and the target value of outflow gas volume can be set, and an alarm can be sounded when it is close;

Pressure gauge 4: Combined with the flow rate of the flowmeter, control the intake air volume. Monitor the inflation pressure change at the inlet at any time, control the inflation pressure below 0.05MPa, and prevent the pressure release device from operating;

Inflation valve 5: control the inflation process of nitrogen;

Inflatable tube 12: used to connect various components.

How to use this device:

1. Close the valve between the bushing and the transformer oil tank, and open the air release plug 11 of the rising seat;

2. Connect the pressure gauge 4, the inflation valve 5 and the flow meter 6 between the vent plug installation hole and the nitrogen cylinder 7 with the inflation tube 12;

3. Open the butterfly valve 8 and the inflation valve 5, and fill the rising seat of the casing to be replaced with a certain amount of nitrogen to ensure that the oil level is not lower than the bottom of the rising seat.

4. After the nitrogen gas is charged, close the butterfly valve 8 and the inflation valve 5, and replace the casing with a lifting tool.

5. After the bushing is replaced, replace the inflation device with an air release plug, open the butterfly valve 8, let the oil in the oil conservator flow back into the raised seat, and discharge the residual gas of the raised seat.

The application effect of this device:

1. The operator does not have to climb on the top of the oil pillow many times, avoiding the danger of high fall;

2. There is no need to destroy the seal of the transformer during the whole process. The nitrogen gas charged is a gas with high purity, and the volume of the nitrogen gas charged has been accurately calculated and controlled, so it has no effect on the transformer oil, the lifting seat, and the body of the device;

3. The workload of personnel is greatly reduced: there is no need to connect the power supply, connect the oil pipe, and drain the oil at the oil discharge valve at the bottom of the transformer to lower the oil level, so that there is no loss of transformer oil, so there is no need to replenish the transformer with oil, and there is no need to inflate the capsule oil pillow ;

4. The number of staff is reduced from 6 to 3, the time is reduced from 4 hours to 2 hours, and the work efficiency is greatly improved.

Claims (2)

1. one kind for changing the forced oil device of bushing shell for transformer, it is characterized in that, it comprises high-pressure nitrogen bottle (7), flowmeter (6), charge valve (5), Pressure gauge (4) and gas-filled tube (12), one end of described gas-filled tube (12) is connected with nitrogen cylinder (7), the other end is connected with the pore at bushing shell for transformer rising seat (1) top, and described flowmeter (6), charge valve (5) and Pressure gauge (4) are connected to nitrogen cylinder (7) in turn to the gas-filled tube (12) raise between seat (1).

2. according to claim 1ly for changing the forced oil device of bushing shell for transformer, it is characterized in that the described bushing shell for transformer pore employing air relief cock installing hole that seat (1) top is connected with gas-filled tube (12) that raises.

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