How to install current transformer? The current transformer is the power supply that supplies the starting current for measuring instruments and relay protection devices. At the same time, due to transportation, relocation and other reasons, before installing the current transformer, an appearance inspection must be carried out; check whether there are drops or cracks on the surface of the porcelain body; whether there are cracks on the flange; whether the through-core conductive rod is firmly fixed wait. The installation of current transformers depends on the equipment configuration. Next, we will introduce the current transformer installation method and current transformer installation specifications in detail.

1. How to install the current transformer

1. Construction should be carried out according to the drawings, the wiring should be correct, the number marks on both ends of the wire should be clear, and the number range should meet the requirements of the regulations.

2. The secondary circuit wires or cables should all use copper wires. The cross-section of the current transformer loop wire should not be less than 2.5mm2, and the cross-section of the voltage transformer loop wire should not be less than 1.5mm2.

3. The first terminal block of the current transformer outlet should use special current terminals. The secondary winding not used by the current transformer should be short-circuited and grounded at the wiring board.

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4. The secondary circuit wires in the panel and cabinet should not have joints, control cables or wires in the middle There should also be no joints. If joints are necessary, their long terminal box should be used for transition connection.

5. The polarity of the current transformer cannot be reversed, and the phase sequence and phase difference should comply with the design and regulatory requirements. For the transformer wiring for differential protection, the current phases of both arms must be measured before being put into operation. Measure the diagram to check the correctness of the wiring

6. The arrangement of the secondary circuit wires should be neat and beautiful. The connecting screws between the wires and the electrical components and terminal blocks must have no loose connections. The distance between the wire binding handles and the stuck points should be Comply with regulatory requirements.

7. The secondary circuit should be well insulated from the ground, and there should be no mixed lines between the voltage circuit and the current circuit.

8. The current and voltage loops should be grounded at one point at the secondary side outlet of the transformer.

2. Current transformer installation specifications

1. The current transformer must be installed firmly, and the exposed metal part of the transformer shell should be reliably grounded.

2. The same group of current transformers should be installed in the same direction to ensure that the positive directions of the primary and secondary circuit currents of the group of current transformers are consistent, and the nameplate should be as easy to observe as possible.

3. Open circuit is not allowed on the secondary side of the current transformer. When only one secondary circuit is used for the secondary double-turn transformer, the other secondary circuit should be reliably short-circuited.

4. The secondary side of the low-voltage current transformer does not need to be grounded. Because the insulation levels of the wires, energy meters and transformers used in the low-voltage metering device are the same, the maximum voltage they can withstand is basically the same; in addition, after the secondary winding is grounded, the insulation level of the primary circuit of the entire device to the ground is reduced, which can easily cause insulation weaknesses. The electric energy meter or transformer is damaged when high voltage occurs (such as induced lightning strike). From the perspective of reducing damage caused by lightning strikes, it is also better to not ground the secondary side.

Transformers, electric meters and instruments

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