How to use the instrument transformers of Chint Electric?

 The usage methods of Chint Electric's instrument transformers are as follows:

 Current Transformer

1. **Installation Location**: It should be installed on the circuit where the current needs to be measured, usually close to the power supply side or the load side of the measured circuit. For example, in the power distribution cabinet, it can be installed on the busbar or the branch cable.

2. **Wiring Method*YouTube：https://youtube.com/shorts/o-0G5SRhm5s  *:

    - For the single-turn current transformer, the primary side wire should pass directly through the central hole of the transformer. Pay attention that the wire should be in the center of the hole to ensure the measurement accuracy.

    - For the multi-turn current transformer, the primary side winding should be wound on the iron core of the transformer according to the specified number of turns, and the connection of the winding should be firm and reliable.

    - When wiring the secondary side winding, pay attention to the polarity. It is usually marked with identifiers such as "K1" and "K2". "K1" is the current outflow terminal, and "K2" is the current inflow terminal, which should be correctly connected to the corresponding terminals of the measuring instrument or protection device.

3. **Select the Appropriate Transformation Ratio**: Select the transformation ratio of the current transformer according to the rated current of the measured circuit. For example, if the rated current of the measured circuit is 500A, a current transformer with a transformation ratio of 500/5 can be selected, so that the current output on the secondary side is 5A, which is convenient for the measuring instrument to measure.

4. **Grounding Requirements**: One end of the secondary side winding of the current transformer must be reliably grounded to prevent the high voltage on the primary side from intruding into the secondary side, endangering personal and equipment safety.

 Voltage Transformer

1. **Installation Location**: Generally, it is installed on the power supply side or the circuit where the voltage needs to be measured, such as on the busbar side of the substation or in the incoming line cabinet of the power distribution room.

2. **Wiring Method**:

    - The primary side winding should be connected in parallel with the measured circuit, and its wiring should be carried out according to different voltage levels and wiring methods. For example, in a three-phase four-wire system, three single-phase voltage transformers can be connected in a Y/Y0 mode. The leading ends of the primary side windings are respectively connected to the three-phase power supply, and the ends are grounded.

    - When wiring the secondary side winding, also pay attention to the polarity. It is usually marked with identifiers such as "a" and "x". "a" is the voltage output terminal, and "x" is the grounding terminal, which should be correctly connected to the corresponding terminals of the measuring instrument or protection device.

3. **Select the Appropriate Transformation Ratio**: Select the transformation ratio of the voltage transformer according to the rated voltage of the measured circuit. For example, if the rated voltage of the measured circuit is 10kV, a voltage transformer with a transformation ratio of 10000/100 can be selected, so that the voltage output on the secondary side is 100V, which is convenient for the measuring instrument to measure.

4. **Fuse Installation**: Fuses should be installed on both the primary side and the secondary side of the voltage transformer to prevent the equipment from being damaged when a short-circuit fault occurs in the transformer.

When using Chint Electric's instrument transformers, it is necessary to operate strictly in accordance with the product manual and relevant electrical safety standards to ensure the accuracy of measurement and the safe operation of the equipment. If you have any questions about the use of the instrument transformers, it is recommended to consult a professional electrical engineer or Chint Electric's technical support personnel.