On the medium and low voltage side of the main transformer, the bus tie switch and the original electromagnetic relay maintenance DC circuit of each outlet, the PLC is used for logical comparison to determine whether it is a fault in the maintenance area or a fault outside the area.
1. 10 kV bus maintenance The 10 kV main wiring of the substation, each outgoing line has no power supply, each outgoing line and bus tie maintenance selects two-phase incomplete star-shaped current quick break and overcurrent maintenance, and the low-voltage side of the main transformer is equipped with three-phase complete star-shaped composite voltage overcurrent maintenance. The instantaneous closing contact of the time relay is used as the input contact of the PLC, and the PLC output controls the DZ52 central relay to jump the switch on each side of the main transformer.
The low-voltage side of the main transformer selects three-phase complete star and each outgoing line, and the two-phase incomplete star wiring is selected for bus maintenance, which can prevent the two-point grounding short circuit between the B phase of the bus and the A or C phase of the outgoing line. The AC power supply used in the PLC is provided by the on-line UPS. The bus maintenance is divided into two sections, the I. section is instantaneous, and the maintenance scale is from the bus to each circuit breaker; II. Short delay, maintenance scale from main transformer circuit breaker to main transformer 10 kV current transformer (including circuit breaker).
2. 35 kV bus maintenance The 35 kV main wiring diagram of the substation is similar to Figure 1, some of the outgoing lines have power supply, and the outgoing line without power supply and bus tie maintenance choose two-phase incomplete star current quick break and overcurrent maintenance; The outgoing line with power supply is equipped with two-phase incomplete star direction overcurrent maintenance; The 35 kV side of the main transformer is equipped with a three-phase complete star composite voltage direction for overcurrent maintenance. The instantaneous closing contact of the over-current or directional over-current time relay is used as the input contact of the PLC.
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