The current in the distribution cabinet suddenly increases during a certain period of time?

It is estimated that there is a large electricity unit in your area, and the electricity consumption suddenly changes between 12:00-2:00 pm, causing the grid voltage to rise suddenly, so the current suddenly increases.

In particular, there are no units around that use a thyristor power control system, which will cause large fluctuations in the grid voltage.

We recommend the following:

1. Check the electrical equipment under the distribution cabinet to see if there is a high power output during the accident period.

2. Check the internal distribution cabinet and the line connection to each electrical equipment to see if there is any false connection.

3. Investigate whether there are human factors (misoperation, etc.) during the accident caused by short circuits.

4. Check whether the electrical equipment is damaged (from 12 o'clock to 2 o'clock in the evening, it is the low peak of electricity consumption, and the line voltage is relatively high, if the equipment itself is on the edge of damage, such as diodes, etc., there may be instantaneous breakdown when the voltage reaches a certain level, which will cause a short circuit).

Under normal circumstances, if the design is fine, there will be no situation as you said, in this case, I personally think that there is a high possibility of false connection of the line, you do a good job to check the line.

1.The high current is related to the load, you first have to check the electricity consumption of the user at the lower end of the tripping circuit breaker, find the reason for the trip, why there is so much current between 12 o'clock and 2 o'clock in the evening. 2.

If it is connected to the UPS, it is necessary to check whether the UPS is working normally, first disconnect a part of the tripped equipment to see if there is still a tripping problem in the line, and if so, turn off the tripped equipment, so that you can find the root of the problem.

There is no load and jumps, that is, there is a short circuit of the line.

Causes and solutions:

1. If the power of electrical appliances is too large, it is the so-called overload.

Solution: Reduce the power of electrical appliances.

2. There is a problem with the line. In other words, there may be a false connection in the line, which will increase the current in the line.

Workaround: Readjust the route.

3. The gate is damaged. In other words, during the normal use of the brake, the contacts are oxidized, and the contact defect occurs.

Solution: Repair and replace the brake.

What is a distribution box? Generally, there is a current sound because the quality of some parts is not good or the internal screws are loose, and the load is too heavy, or the power of the components is too small, or the line square is not enough, and it is overloaded.

Hello, 1. Fault phenomenon: the reason lies in the protective action. The high-voltage cabinet is equipped with overcurrent, quick cut-off, gas and temperature protection.

2. Judgment method: The cause of the fault can be judged according to the relay card drop, remote signaling information, etc. In the high-voltage cabinet, there is a corresponding signal relay drop indication after the gas and temperature protection action. The operation of the overcurrent relay (GL type) cannot distinguish between overcurrent and quick break.

In the time-limit protection circuit, the overcurrent and quick break are protected by two (JL-type) current relays. When the relay is operating, the red light-emitting diode lights up, so you can clearly determine the cause of the operation. 3. Handling method:

The overcurrent relay action trips the switch because the line is overloaded. Before power transmission, the user should be negotiated to reduce the load and prevent it from tripping again after power transmission. When the quick-break trip is not prudent, the bus, transformer, and line should be checked.

Find the short-circuit fault point and troubleshoot it before sending power.

Dear Glad for your question The excessive current in the distribution cabinet is due to a fault phenomenon: the reason lies in the protection action. The high-voltage cabinet is equipped with protection against overcurrent, quick break, gas and temperature.

Solution: Carefully distribute the processing method: The overcurrent relay action trips the switch because the line is overloaded.

Before power transmission, the user should be negotiated to reduce the load and prevent it from tripping again after power transmission. When the quick break trips, the busbar, digging transformer, and line should be checked. Find the short-circuit fault point and troubleshoot it before sending power.

That's all for me, I hope mine can help you.

Summary. First, the transformer problem, there is a local short circuit inside the coil group, but it is not all burned out, the result is that the number of turns becomes less, and the transformation ratio becomes smaller. (For example, it used to be 300 5, but now it is 200 5) and the reading becomes larger.

Second, the current has indeed become larger. a. Lack of phase, this split-phase ammeter is easy to see, if it is not a split-phase ammeter, it should be measured. b. The bearing is damaged, resulting in an increase in load.

c. Motor failure, resulting in increased load. d. The load does increase due to other reasons. For example:

The water pump is clogged. After the load of the distribution cabinet is disconnected, the single-phase ammeter is too large, why is it faulty.

First, the transformer problem, there is a local short circuit inside the coil group, but it is not all burned out, the result is that the number of turns changes is less, and the change ratio becomes smaller. (For example, it used to be 300 5, but now it is 200 5) and the reading becomes larger. Second, the current has indeed become larger.

a, the lack of phase, this phase ammeter is very frank and easy to see, if it is not the old letter judgment of the phase ammeter, it should be measured. b. The bearing is damaged, resulting in an increase in load. c. Motor failure, resulting in increased load.

d. The load does increase due to other reasons. For example: a clogged water pump.

Whether the ammeter is damaged.

After disconnecting the load, the switchboard ammeter.

It's not a secondary box ammeter, right?

In the case of power failure and difficulty, use the meter to measure the lower resistance, if the conduction or resistance value is particularly small, there may be a second method of short circuit at the lower port, disconnect the load, and send the base transponder separately, if it can be used normally, it is a load side problem, and it is a circuit breaker problem that cannot be sent.

What is the problem of the load side?

Refers to the equipment or transmission line connected to the lead wire of the user terminal with arc extinguishing measures.

Summary. After the load of the distribution cabinet is disconnected, the single-phase ammeter is too large, why is it faulty.

If the neutral point in the system is grounded, then the fault phase where the single-phase grounding occurs is the fault phase with the largest current.

If the system is neutral and ungrounded, then the three-phase current is basically constant when single-phase grounding occurs.

After the load of the distribution cabinet is disconnected, the single-phase ammeter is too large, why is it faulty.

After the load of the distribution cabinet is disconnected, the single-phase ammeter is too large, why is the fault If the neutral point of the system is connected to the bench to give way to the ground, then the single-phase grounding is the fault phase with the largest current. If the system is a neutral non-grounding system, then the three-phase current is basically unchanged when single-phase grounding occurs.

If the single-phase current of the circuit breaker is too large, the sudden increase in the one-phase current leads to tripping, which should be a serious imbalance of the three-phase load, and the poor contact of the zero line will cause excessive current ablation and answer the code. The solution is to make the three-phase load as balanced as possible, and at the same time, redo the total grounding to reduce the grounding resistance to below 5.

The air switch can't be closed immediately if it trips over overload, and you can't close the light button. 2. Because the action element of overload tripping is a heat-sensitive element such as a bimetal sheet, the heat is large if the current is large, and the deformation of the component is large, which pushes the tripping mechanism to trip, and it cannot be closed before the temperature drops down. 3 In addition, before the overcurrent factor is eliminated, close immediately, which will cause a new trip of the finger grip.

The air switch is short-circuit protected, and it can only be operated when it is more than double.