Low-voltage current transformer selection instructions

1. Select the corresponding product according to the parameters such as primary current and busbar section. The primary wire passes through the transformer window. Open the flip cover, perform secondary wiring through the wire crimping piece, and reset the flip cover after the secondary wiring is drawn out. The metering electric energy can be directly sealed by using the small hole of the flip cover to prevent electricity theft.

2. The working current does not exceed 1.1 times the rated value for a long time, and it is allowed to use it for a short time when it is 1.2 times the rated value, and the time does not exceed 1h;

3. Select the rated current ratio according to the size of the measured current. Generally, the measured current is selected to be 2/3 of the rated current;

4. The polarity of the product is expressed as: primary wiring marks P1, P2, corresponding secondary wiring marks S1, S2; S1 means the same name end of P1, S2 means the same name end of P2;

5. The measuring instrument is connected to the S1 and S2 terminals. At this time, the total load of the connected circuit should not exceed the rated load of the transformer. When the installation of the ammeter is far away from the current transformer or the loop load is large, it should be preferred. A current transformer with a secondary current of 1A;

6. Pay attention to the selection of transformers that match the size of the window according to the specifications and number of busbars.