1. It is the wiring form of a single current transformer.
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It can only reflect the single-phase current. It is suitable for measuring one-phase current or three-phase load balance. When measuring one phase, you can know the three-phase condition. Most of them use the current meter.
2, three-phase full star connection and delta connection form.
The three-phase current transformer can accurately understand the change of the three-phase load in time, and is often used in the transformer differential protection wiring. Use only three-phase full star connections for current collection in energy meters in a neutral point direct earthing system. The three-phase three-relay wiring method can not only react to various types of phase-to-phase short circuits, but also react to single-phase grounding short-circuits. Therefore, this wiring method is used for protection of phase-to-phase short-circuit protection and single-phase grounding short-circuit in a neutral point direct-grounding system.
3. Two-phase incomplete star connection.
Used the most in practical work. It saves a current transformer and uses the combined current of phases A and C to form an inverted phase B current. The two-phase dual relay wiring method can react to the phase-to-phase short circuit, but cannot completely respond to the single-phase grounding short circuit, so it cannot be used for single-phase grounding protection. This type of wiring is used for neutral point ungrounded systems or for phase-to-phase short circuit protection via arc suppression coil grounding systems.
4, two phase difference current wiring form.
It is also only used in three-phase three-wire circuits. The neutral point is not grounded or neutral. The advantage of this type of wiring is that it not only saves a current transformer, but also can reflect various kinds of three-phase circuits with a relay. Interphase short circuit fault, that is, complete the three-phase overcurrent protection with a minimum of relays, saving investment. However, when the fault forms are different, the sensitivity is different. This type of wiring is often used for phase-to-phase short-circuit protection in distribution networks of 10kV and below. Due to the low sensitivity of this protection, modernity has been seldom used.
