What are the regulations on the operation sequence of the main transformer shutdown and power transm

The operation sequence of main transformer stop and power transmission: when the power is off, the load side is stopped first, and the power supply side is stopped later, and the power transmission is the opposite.

Because: (1) in the case of multiple power supplies, the power failure in the above order can prevent the transformer from backlashing, if the power is off, the power supply side will be stopped first, and in case of failure, it may cause the protection to be misoperated or refused, and the extension of the fault removal time may also expand the scope of the power outage. (2) When the load side bus voltage transformer.

When there is a low-cycle load-shedding device and no current lock-off is installed, the power side switch is stopped before the power is off, and the low-cycle load-shedding device may malfunction due to the anti-locking of the large synchronous motor. (3) Gradually transmit power from the power supply, and in case of failure, it is easy to check, judge and deal with it according to the power transmission range.

The specific regulations are:

1) The operation of power failure must be operated in the order of circuit breaker - load side isolation switch - bus side isolation switch.

2) The power transmission closing operation should be carried out in the opposite order to the above.

3) Strictly prevent the disconnecting switch with load.

The power outage sequence of the high and low voltage distribution room:

When power is transmitted: the power side is sent first, and then the load side is sent.

Transmission. The high-voltage power supply --- the high-voltage outlet--- the ground presses the incoming line--- the low-voltage outgoing line --- the load.

In the event of a power outage: stop the load side first and then the power side.

Blackout. Load.

-Low-voltage outlet--- ground pressure inlet line--- high-voltage outlet--- high-voltage power supply. The indoor power distribution place with low voltage load is called the power distribution room, which mainly distributes electric energy to low-voltage users, and is equipped with medium-voltage incoming lines (there can be a small number of outgoing lines), distribution transformers and low-voltage distribution devices. The facilities of 10kV and below voltage level equipment are divided into high-voltage distribution rooms and low-voltage distribution rooms.

The high-voltage distribution room generally refers to the 6kV 10kV high-voltage switch room; The low-voltage distribution room generally refers to the 400V distribution room for the transformer line of the 10kV or 35kV station.

In the process of using the transformer, there are times when it is necessary to carry out power outage operation, and today Xuzhou Hengli transformer will mainly tell you what principles need to be followed in the power outage operation of the transformer.

The first thing to pay attention to in the operation of transformer power outage is that before the transformer is stopped and transmitted, the problem of switching the neutral point should be considered to ensure that the number of neutral points directly grounded after the power outage remains unchanged.

1. Before stopping and transmitting power, the neutral grounding knife must be closed, and the zero sequence protection should correspond to the neutral grounding mode of the transformer.

2. The input and deactivation of the transformer must be operated by a circuit breaker, and it is not allowed to pull any no-load transformer with a switch.

3. The power transmission operation should be carried out in the order of the power supply side first and then the load side, and the power failure operation should be carried out in the order of the load side and then the power supply side. It is forbidden to reverse charge the transformer from the low-voltage side (applicable to step-down transformers).

4. Before the transformer transmits the power to the bright key, the main protection such as heavy gas protection must be thrown into the tripping position.

5. The cooling device should be started 30 minutes before the main transformer is put into operation.

6. Before the newly installed and overhauled transformer is put into operation, it should be impacted and closed five times under the rated voltage, and the transformer with the replacement coil should be impacted and closed three times.

7. Newly installed and transformers that may change the phase must be confirmed by the maintenance personnel through line checking, phase verification and other methods before being put into operation, and make a detailed written disclosure.

8. For the transformer after new installation, overhaul, accident overhaul or oil change, the static time before applying voltage should not be less than the specified in Liangyun: 110kV and below 24h; 220kv and below 48h; 500kv and below 72h.

Summary. Hello, I have seen your question and am sorting out the answer, please wait for a while What is the operation sequence of transformer power outage?

Hello, I have seen your question and am sorting out the answer, please wait for a while What is the operation sequence of transformer power outage?

The operation sequence of power transmission: in the event of a power failure, the load side is stopped first, and the power supply side is stopped later, and the power transmission is reversed. (1) In the case of multiple power supplies, the power failure can be prevented from changing the macro and changing the sock pressure device from backflushing the power, if the power is off, the power supply side will be stopped first, and in case of failure, it may cause the protection to be mistaken or refused, and the fault removal time may also expand the scope of the power outage.

The operation sequence of the line power transmission is: pull the grounding gate knife at each end of the line (or remove the grounding wire), close the bus side gate knife and line side knife switch at both ends of the line, and close the switch.

The sequence of power outages is related to the voltage level of the transformer and the number of windings. For example, the general 10 is very simple: stop the low-voltage load - low-voltage main switch - high-voltage outlet switch - grounding knife (hanging grounding) - hanging warning signs; Transmission vice versa.

Power Outage: 1Disconnect the load carried by the transformer.

2.Disconnect the low-voltage side switch of the transformer.

3.Disconnect the power supply on the high side of the transformer, 4Hang a pair of grounding wires (ground knives) on each side of the high and low voltage side.

Power Transmission: Opposite to the power outage step.

1.Disassemble the ground wire, 2Send the high pressure side, 3Send the low pressure side, 4Send loads.

Power failure operation: start from the load side to the power side operation, such as the low voltage for the load side, should first open the low-voltage side capacitor switch, then open the low-voltage side switch, knife switch, then pull the medium-voltage side capacitor, then open the medium-voltage side switch, knife switch, and finally open the high-voltage side switch, knife switch.

Power transmission operation: operate from the power supply side to the load side, first send the high-voltage knife switch and switch, then close the medium-voltage knife switch and switch, then close the low-voltage side knife switch and switch, and finally close the capacitor knife switch and switch according to the load situation.

Because the incoming line protection does not affect the reversing gate, the incoming line protection can still be reversed, and the incoming line protection only prevents the current from being too high in the substation, but does not affect the reversing operation.

Electrical equipment is divided into three states: operation, standby (cold standby and hot standby), and maintenance. The process of transforming the equipment from one state to another is called reversing, and the operation is called reversing. Switching electrical equipment from one state to another or changing the way the system operates by operating disconnectors, circuit breakers, and hanging and removing ground wires.

This operation is called the reverse operation.