10 to 0.4 thousand volt box can burn out the voltage transformer when the high voltage side is phase

Reasons for the burnout of the high-voltage voltage transformer - (1) When the voltage transformer is short-circuited between low-voltage turns and phases, the low-voltage fuse has not yet been fused, and the high-voltage fuse is blown or burned out due to the rapid increase of the excitation current. (2) When the 10kV outgoing line is single-phase grounded, the non-fault relative ground voltage on the primary side of the voltage transformer is 3 times of the normal voltage value. The core of the voltage transformer is quickly saturated, and the excitation current is sharply enhanced, causing the fuse to blow.

For information, please log in: Power Transmission and Distribution Equipment Network (3) Because the power network contains capacitive and inductive parameters, especially the ferromagnetic inductive elements with iron cores, ferromagnetic resonance is caused when the parameter combination is unfavorable. If the circuit breaker is closed at the same time, the no-load bus with transformer and ferromagnetic voltage transformer is put in, and the high-voltage wire coil of the distribution transformer is short-circuited to the ground, it may cause ferromagnetic resonance.

In the event of ferromagnetic resonance, the overvoltage multiple can reach more than double, which causes the insulation breakdown of electrical equipment and the accident of burning the equipment. (4) The zero sequence current flowing through the primary winding of the voltage transformer increases (relative to the system with excessive grounding current), and the thermal effect generated by the zero sequence current will damage and burst the insulation of the voltage transformer during long-term operation; (5) There is a nonlinear oscillation (arc ground overvoltage) in the system, which greatly aggravates the damage process of the voltage transformer in the system; (6) The heat dissipation conditions of the voltage transformer itself are poor. At the same time, the lack of phase in the transformer will not cause the voltage transformer to burn out.

The box is out of phase and will not burn out the voltage transformer

Hello dear, your question: Will the fault on the low voltage side cause the 10 kV high voltage transformer to burn out? The answer is:

Hello, a fault on the low voltage side can cause the 10 kV high voltage transformer to burn out, but this is not absolute. A transformer is a device used to convert high voltage to low voltage, and it is often used in power systems in order to monitor current and voltage. If a fault on the low voltage side causes excessive current, then the high voltage transformer may be subjected to excessive current shocks, resulting in burnout.

However, if there are protections on the high-voltage side, such as overcurrent protection or short-circuit protection, then these protections may prevent the transformer from burning out. Therefore, it depends on the specific power system and the protection measures of the transformer. If you experience such problems, it is important to consult a professional electrical engineer to ensure safe skin and reliable skin differences.

Summary. No. A fault on the low voltage side may cause damage to the low voltage transformer, but will not affect the 10 kV high voltage transformer.

The reason is that when there is a fault on the low voltage side, it will cause a certain degree of change in voltage, but because the transformer has been mechanically classified, when the low side changes, it will not affect the high side, so that the 10 thousand volt high voltage transformer will not be damaged. In addition, when using 10 thousand volt high-voltage transformers, it is necessary to pay attention to the process requirements of the installation environment, and regularly inspect and maintain the insulation performance of the transformer to ensure that it can be used normally. In addition, it is important to ensure that there are adequate protections in the circuit to prevent the transition current to the 10 kV high voltage transformer in the event of a low-voltage fault.

No. A fault on the low voltage side may cause damage to the low voltage transformer, but will not affect the 10 kV high voltage transformer. The reason is that when the low-voltage side fails, it will lead to a certain degree of change in voltage, but because the transformer has been mechanically classified, when the low-side changes, the discord will affect the high-side, so that the 10 thousand volt high-voltage transformer will not be damaged.

In addition, when making the 10 thousand volt high-voltage transformer for the chain, it is necessary to pay attention to the process requirements of the installation environment, and regularly inspect and maintain the insulation performance of the transformer to ensure that it can be used normally. In addition, it is important to ensure that there are adequate protections in the circuit to prevent the transition current to the 10 kV high voltage transformer in the event of a low-voltage fault.

Are you in the power industry?

If yes, I will consult you if you have any questions in the future.

No, but I have a certain understanding of the power industry and its phase-off technology, such as power transformers, power measurement, power dispatching and operation of car potatoes, etc., and I will learn and communicate with them when I have time.

Generally speaking, a low-voltage side failure will not directly cause the 10 kV high-voltage transformer to burn out, because the low-voltage side-shielded fault only affects the electrical rough travel voltage level below 10 kV. However, if the fault on the low-voltage side is severe enough to cause excessive current or short circuit, this will increase the voltage of the high-voltage side macrobench, which may cause damage to the 10 kV high-voltage transformer or even cause burning. Therefore, when dealing with low-voltage side faults, it is necessary to pay attention to controlling the current and taking timely measures to prevent damage to the high-voltage side equipment.

The vast majority of 10kV voltage transformers** are due to resonance resulting in overvoltage and overcurrent (voltage resonance and current resonance) that damage the insulation of primary equipment; In addition, there are many occurrences of short circuits and burns them out.

Insulation damage, one to the secondary or ground breakdown to produce a large current; Overcurrent, ferromagnetic resonance causes the core to saturate, and the current rises sharply; Secondary short circuits can also cause; The ampere-second characteristics of the fuse are not good, and the faulty overcurrent equipment cannot be fused in time.

Insulation breakdown, overload or short circuit on the secondary side, resonant overvoltage.

Resonance can cause damage, which I encountered once in our company.

There are many kinds, the secondary short-circuit fuse does not explode and causes the PT to burn; Damage to the quality or insulation leads to PT breakdown burnout; The open triangle grounding is also burned PT, (this fault will not be burned immediately, if the system has indirect grounding etc. after a period of operation, PT will be burned); Long-term operation in overvoltage, overload, etc.; This is rare.

It depends on the reason for the burning:

1. The quality problem of the transformer;

2. Why does the primary and secondary fuse wire of the transformer not work?

3. Ferromagnetic resonance (with detuner).

4. If the railway or high-speed rail is used, it should be specially made;

5. The use of system voltage or environment is not suitable.