1. According to the construction of the drawing, the wiring is correct, and the numbering marks on both ends of the wire should be clear, and the range of the label is in accordance with the requirements of the code.

2. Copper wires should be used for the secondary circuit wires or cables, and the current transformer loop should not be less than 2.5mm2, and the cross section of the voltage transformer should not be less than 1.5mm2.

3. The first terminal of the current transformer outlet shall select the special current terminal, and the secondary winding not used by the current transformer shall be short-circuited and grounded at the terminal.

4. There should be no joint in the secondary loop wire in the tray or cabinet, and there should be no connection between the control cable or the conductor. If there must be a connection, the connection of the terminal box of the terminal of the director should be used.

5. Current transformer can't meet the polarity, phase sequence, phase don't should comply with the requirements, design and procedures for the use of transformer differential protection connection, must be determined before running two arms current phasor diagram to test the correctness of the connection.

6. The wire alignment of the secondary circuit should be neat and beautiful. The connecting screws of wires and electrical components and terminals must be free of virtual connection, and the distance of the conductor should meet the requirements of the code.

7. The secondary circuit should be well insulated, and there should be no mixing between the voltage circuit and the current loop.

8. Both current and voltage circuits shall be grounded at the secondary side of the transformer. The voltage circuit shall be protected by a fuse.

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