How to check and deal with the circuit breaker tripping in the next step, and how to check and deal

Transformer high-voltage main switch.

The protection current of this switch is 63A

The protection current is less than that of other switches.

It is assumed that the current is 65A in the event of a short circuit

Its current exceeds the protection current of GZS1-12KV-63A 63So it tripped.

However, it does not exceed the current of the following protection switches.

bkw5-1600a（630a）

bkw5-2600a（2000a）

bkw5-4000a（3200a）

In the eyes of these three switches, 65A is within the normal range of current, so it does not trip.

Summary: It's normal to trip like this!

First of all, I want to explain that the phenomenon you mentioned is only related to the switch in one case, that is, the switch refuses to move, in which case it is the fault of the switch itself, which causes the superior protection to trip.

All other cases are relay problems: first of all, the selectivity of microcomputer relay protection (that is, which switch protects which line), its selectivity is achieved through the setting of the current value and the tripping delay cooperation.

In other words, the current setting value of the high-voltage switch can be smaller than the low-voltage switch, if it is the backup protection of the low-voltage switch, the current setting value of the high-voltage switch must be smaller than the low-voltage switch, otherwise the high-voltage switch can not protect the low-voltage line, but the trip delay of the high-voltage switch is longer than the low-voltage switch, and the fault occurs normally, the low-voltage switch and the high-voltage switch should be started at the same time, but the delay of the low-voltage switch is short, and the fault will be tripped and cut off first.

The above is the situation of high-voltage switch as low-voltage switch backup protection.

Analyze your accident, the faults may be as follows, which can be checked in turn:

1. The switch refuses to move, and the switch itself is a problem.

2. The low-voltage protection is not put in, or the input is wrong.

2. The setting of high and low voltage protection is incorrect, or the value of high and low voltage protection is improperly matched.

It can only explain one problem, the protection of the low-voltage circuit breaker is not set, and the protection of the high-voltage cabinet has been set and invested, according to the analysis of personal experience, the fault situation of your microcomputer protection device action should be a quick breaking action, so as to achieve the purpose of protecting the transformer.

This is because the open circuit fault value set by the switch at the factory setting is high, and the setting value of the operation is low.

After the circuit breaker trips over the level, the protection and the operation of the circuit breaker should be checked first. If it is a protection action and the circuit breaker refuses to trip and causes the level to be skipped, the other non-faulty lines should be powered after the isolation switches on both sides of the circuit breaker should be pulled.

If it is because the protection is not action, the circuit breaker should be disconnected, and then the line by line test power transmission, after the fault line is found, the line will be powered off, the isolation switch on both sides of the circuit breaker will be opened, and then the other non-fault lines will be powered. Finally, look for the reason why the circuit breaker refuses to trip or the protection refuses to act.

Introduction: Circuit breaker refers to a switchgear that can close, carry and break the current under normal loop conditions and close, carry and break the current under abnormal loop conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use, and the division of high and low voltage boundaries is relatively blurred, and generally more than 3kV is called high-voltage electrical appliances.

The circuit breaker can be used to distribute electric energy, start the asynchronous motor infrequently, protect the power supply line and the motor, and automatically cut off the circuit when they have serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switch and over/underheat relay. In addition, it is generally not necessary to change the parts after the fault current is switched off. It has been widely used.

<> circuit breaker. 1. A piece of equipment in the load under the jurisdiction of the line has a serious short-circuit fault.

2. There is a serious interphase short circuit fault at a certain point in the line under the jurisdiction of the circuit breaker.

3. There is a serious ground fault at a certain point in the line under the jurisdiction of the circuit breaker.

In this case, you must not close the operation again! Avoid more serious accidents!

Only when you carefully check and confirm that there is no serious fault hidden danger, can you test the closing operation for the second time!

When the circuit breaker is closed, it trips instantaneously because the line has a short circuit point, and this situation will occur when the short circuit fault is not eliminated.

1. The circuit breaker itself has mechanical problems, such as dead spots or jams, etc.!

2. If it is SF6 high-voltage circuit breaker, it may be caused by the lock-up of SF6 gas pressure reaching the lower limit!

3 is some common locks and the like.

For example, violating the electrical 5 anti-operation, with ground wire and circuit breaker, etc.!

4. Usually, energy storage is required during switch operation before it can be opened.

You check if the energy storage circuit is normal.

5. The DC power supply capacity is insufficient.

Or maybe it's due to the control loop!

6. The remote control cannot be operated.

It could be a burning of the closing coil, etc.

Or remotely split the remote exit burned and so on! That's basically why!

Dear, hello, I am happy to answer for you, the main switch of the leakage switch and the opening jump at the same time The possible reasons for the main switch and the opening jump at the same time are as follows: First, in the same environment, the degree of interference is the same, and the voltage fluctuation of the power grid is the same. Second, the rated capacity of the total leakage protection switch may be small.

When there is overload or overcurrent in the trip shunt, the total leakage protection switch is also in the overload or overcurrent state. Third, the action current of the total leakage protection switch and the opening leakage switch is the same, or less than the action current of the opening leakage switch. Fourth, there is a serious overcurrent in the circuit, or a large current generated by a short circuit in the line or a short circuit in the load.

1. Regardless of the reason for tripping, the main switch trips due to the opening of the main switch, the biggest reason is that the current value of the opening is the same as the rated current value of the main switch, and the short circuit causes the two switches to trip at the same time. 2. The user uses a leakage circuit breaker, and the lines cross each other and cause the trip fault (that is, the zero line of the opening gate is connected to the main gate, and the zero line of the main gate is connected to the opening switch). 3. The circuit breaker is overloaded, and the opening may detect the current overload and prepare to trip, while the main switch is ready to be carried out at the same time, but this is a bit unreasonable.

Or the quality of the main gate is not good, or it is about to be damaged and trips at the same time.

1. Overload tripping.

This is often referred to as the air switch tripping. Especially in the coming winter, a lot of high-power electrical appliances should be used at home, taking electric heaters as an example, the maximum power of an ordinary electric heater has reached more than 2000W, when several same high-power heating equipment work together, or each socket under the same circuit breaker is connected to the heating equipment, at this time, it is easy to cause the circuit load to be too high, causing the circuit breaker to open the overload protection mode - that is, tripping.

2. Short-circuit tripping.

The display of short-circuit tripping on the circuit breaker is the same as overload tripping, both are air switch trips, but short-circuit tripping often has a prominent performance: after closing the tripping switch, it is like tripping again, which is often short-circuit tripping. In this case, it is recommended that you keep the circuit breaker disconnected first, and seek help from an electrician immediately, and remember not to try to solve it yourself.

3. Leakage tripping.

Leakage tripping is different from air tripping, and leakage tripping protects the safety of people. If the circuit breaker does not close, you need to find a professional electrician to repair it.

Summary. With the rapid development of the economy, users' requirements for power quality are getting higher and higher, and it is more and more important to ensure the safe and reliable operation of the power system. The high-voltage circuit breaker is one of the most important switchgear in the power system, which plays a role in the control and protection of the power grid, that is, during normal operation, the corresponding lines or electrical equipment are put into or cut off by opening and closing the circuit breaker, so as to change the operation state of the power grid; When the line or electrical equipment fails, the fault part is quickly cut off from the power grid to ensure the normal operation of the fault-free part of the power grid.

Therefore, the performance of high-voltage circuit breakers and the reliability of their work are important determinants of the safe and stable operation of the power system.

Good afternoon, dear! I'm inquiring for you here, please wait a while, I'll reply to you right away Good afternoon, I'm glad to answer for you! In the process of our anti-hopping test, the 110kV circuit breaker is assigned to give a closing instruction, and it itself gives a opening instruction, so the circuit breaker will be closed after the opening, which is mainly due to the phenomenon of stagnation on the auxiliary contact of the anti-hopping relay in the series dry closing circuit.

With the rapid development of the economy, users' requirements for power quality are getting higher and higher, and it is more and more important to ensure the safe and reliable operation of the power system. The high-voltage circuit breaker is one of the most important switchgear in the power system, which plays a role in the control and protection of the power grid. When the line or electricity is dry and the gas equipment fails, the fault part is quickly cut off from the power grid to ensure the normal operation of the fault-free part of the power grid. Therefore, the performance of high-voltage circuit breakers and the reliability of their work are important determinants of the safe and stable operation of the power system.

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