A current transformer how to install
1, according to the map construction, wiring is correct, the numbering of the two ends of the wire marking should be clear, marking the range in line with the requirements of the regulations.
2, the secondary circuit wire or cable, should be copper wire, current transformer circuit wire cross-section should not be less than 2.5mm2, voltage transformer circuit wire cross-section should not be less than 1.5mm2.
3, current transformer export the first terminal row should be selected for special current terminals, the current transformer is not used for the secondary winding in the terminal board should be short-circuited and grounded.
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4, disk, cabinet secondary circuit wire should not be joints, control cables or wires in the middle of the joints should not be, such as there must be a connector, it should be used for the length of the terminal box transition connection.
5, current transformer polarity can not be reversed, phase sequence, phase should be in accordance with the design and regulation requirements, for differential protection with the transformer wiring, before putting into operation must be determined by the two arms of the current phase diagram to test the correctness of the wiring
6, the secondary circuit conductors should be arranged neatly and beautifully, conductors and electrical components and terminal rows of the connecting screws must be free of loose phenomenon of false connection, conductor tie handle Card point distance should be in line with the requirements of the regulations.
7, the secondary circuit insulation to ground should be good, voltage circuit and current circuit should not be mixed between the line phenomenon.
8, current and voltage circuits, should be in the secondary side of the transformer outlet grounded.
Second, the current transformer installation specification
1, the current transformer must be installed firmly, 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 group of current transformer primary and secondary circuit currents in the same direction, and as easy as possible to observe the nameplate.
3, the current transformer secondary side is not allowed to open circuit, the secondary double-round transformer only a secondary circuit, the other secondary circuit should be reliably shorted.
4, low-voltage current transformer secondary side may not be grounded. Because the low-voltage metering device using wire, meter and transformer insulation level is the same, can withstand the maximum voltage is basically the same; in addition to the secondary winding grounding, the whole set of devices to reduce the level of insulation on the ground, easy to insulate the weak point of the meter or transformer in the role of the high-voltage (such as induced lightning strike) when damaged. From the reduction of lightning damage, also to the secondary side of the ungrounded is preferred.
Transformer power meter instrumentation
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