Whether the current transformer can be short wired to ground with electricity

For high voltage current transformers, it must be grounded. But for low-voltage current transformers, the general practice is grounding.

Why can't the current transformer be grounded at two points for the second time:

The load connected to the secondary side of the current transformer is an ammeter or relay coil, and the impedance is very small, so the two-point grounding on the secondary side of the current transformer will not burn out the current transformer. However, the two-point grounding on the secondary side of the current transformer is equivalent to the bypass formed by the secondary side loop. In this case, if the current transformer is used in the measurement loop, the meter reading will be inaccurate; If a current transformer is used in a protection circuit, it may cause protection rejection.

1. Because the current transformer is a current source, it cannot be opened, because an open circuit means that an infinite resistance is connected, which will cause serious overvoltage and damage the transformer. Therefore, each phase must be shorted at both ends.

2. The common end needs to be grounded to prevent its potential from rising abnormally, and the three common ends are connected separately, but the grounding point is one point.

The reason why the current transformer should be grounded is the same as the grounding of the neutral wire (neutral line), in order to ensure that the secondary auxiliary winding side does not drift and obtain the accurate current value.

It is worth noting that if you are the primary side (high voltage side) that also needs to be connected, the ground is the secondary side (the side connected to the ammeter), not the big side, if it is the ordinary ones that look like a circle, then just connect the secondary side to the ground.

He has 2 pins, so he needs to ground one pole on the secondary side, usually the negative pole. Of course, you also have to look at the wiring diagram of the transformer.

In addition, if the transformer is not connected to the secondary side, that is, there is no ammeter, the secondary side must be short-circuited, otherwise high voltage will be generated or even air breakdown and discharge.

Current transformers require a grounding wire. The secondary side grounding of voltage transformers and current transformers belongs to protective grounding. Because.

If the first, second and secondary side insulation is damaged, the high voltage string on the primary side will be connected to the secondary side, which will threaten the safety of personnel and equipment, so the secondary side must be grounded.

First of all, the use of current transformers is emphasized that its S2 needs to be grounded. Secondly, for the three current transformers at this time, it is connected to the three-phase four-wire energy meter, and the same S2 should also be grounded, as for the deliberate connection together and then grounding, it can be grounded separately, or it can be short-circuited and grounded.

When installing and using the current transformer, it is necessary to pay attention to and distinguish the polarity of the terminal, otherwise the current flowing in the secondary instrument and electric energy meter is not the expected current, and may even cause an accident. For example, if the W phase current transformer is reversed, the current in the common line is not the phase current, but 3 times the phase current, the reading is not accurate, and the ammeter may burn out.

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Why should the current transformer be grounded, and what will be the consequences if it is not connected?

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The through-center current transformer can be grounded, and it will not have any adverse effects if it is not grounded; It must be grounded is a wound current transformer (old type), this kind of current transformer.

The insulation of the first and secondary coils is only isolated by the insulation between the layers, and it is possible to break down and cause an accident before leakage, so it must be grounded.

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Grounding reasons for the secondary side of voltage transformers and current transformers.

1. There should be a grounding point on the secondary side of the voltage transformer, which is mainly for safety considerations. When the insulation between the windings of the primary and secondary side is broken down by the high voltage, the high voltage on the primary side will be channeled to the secondary side, and the grounding of the secondary side can ensure the safety of personnel and equipment. In addition, by grounding, it is possible to supply a phase voltage to the insulation monitoring device.

2. There should be a little grounding on the secondary side of the current transformer. Since the primary side of the high-voltage current transformer is high-voltage, when the high-voltage breakdown occurs between the first and second coils due to insulation damage, it will cause the high-voltage to flow into the low-voltage. If the secondary coil is grounded, the high voltage will be introduced into the ground, so that the secondary coil maintains the ground potential, thus ensuring the safety of personnel and equipment.

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Why should voltage transformers and current transformers be grounded?

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Hello, happy to answer for you. Grounding reason 1 of the secondary side of the voltage transformer and the secondary side of the current transformer, there should be a grounding point on the secondary side of the voltage transformer, which is mainly for safety considerations. When the insulation between the windings of the primary and secondary side is broken down by the high voltage, the high voltage on the primary side will be channeled to the secondary side, and the grounding of the secondary side can ensure the safety of personnel and equipment.

In addition, by grounding, it is possible to supply a phase voltage to the insulation monitoring device. 2. There should be a little grounding on the secondary side of the current transformer. Since the primary side of the high-voltage current transformer is high-voltage, when the high-voltage breakdown occurs between the first and second coils due to insulation damage, it will cause the high-voltage to flow into the low-voltage.

If the secondary coil is grounded, the high voltage will be introduced into the ground, so that the secondary coil maintains the ground potential, thus ensuring the safety of personnel and equipment. Hope it helps you and I wish you happiness and happiness every day! 欄欄

Kiss! Generally speaking, one end of the current transformer needs to be connected to the circuit, and the other end needs to be connected to the measuring instrument or protective device, and not to ground. However, in specific application scenarios, the dejust needs to ground the metal housing of the current transformer to ensure safety and signal quality.

Specifically, if the current transformer is installed on high-voltage electrical equipment or high-voltage power lines, its metal housing needs to be grounded to ensure safety. In addition, in some special measurement occasions, such as measuring high-frequency currents or environments with strong electromagnetic interference, it is also necessary to ground the metal shell of the current transformer to reduce limb interference and improve signal quality. It should be noted that when grounding, attention should be paid to maintaining the insulation performance of the current transformer to avoid problems such as grounding faults or live faults, so as to ensure the safety and stability of the circuit.

In a normal situation, the external shell of the current transformer metal should be grounded to ensure safety. Fully grounded to prevent the enclosure from being electrified and avoiding the risk of electric shock. However, whether it is necessary to re-infiltrate the specific area depends on the actual situation, such as the use of the equipment, the environment, the installation location and other factors in the ridge.

When installing an electric inductor, you should carefully read the relevant installation instructions and safety regulations to ensure that the ground connection is carried out correctly.

The <>-friendly transformer is a kind of power permeability measurement and protection equipment, which can convert the current of high voltage into the current of low voltage for easy measurement and protection. When using a current lead old ridge transformer, it is usually necessary to ground it to ensure safety and reliability. Grounding can effectively prevent the housing and internal components of the current transformer from being electrified, thus avoiding electric shock and other safety accidents.

In addition, grounding can also improve the immunity of the current transformer and reduce the influence of external electromagnetic interference on the measurement results. Therefore, it is recommended that every current transformer be grounded.