Spare power automatic switching emergency device and method for power system of transformer substation

Abstract

The invention provides a spare power automatic switching emergency device for a power system of a transformer substation. The spare power automatic switching emergency device comprises a sampling unit, a protection unit, a switching transistor and a logical control unit, wherein an own side switch in the sampling unit is connected with an own side power supply incoming line and a bus, a bus coupler switch is connected with own and opposite side buses, a voltage sampling module is connected with own and opposite side power supply incoming lines, and a current sampling module is connected with an own side bus; the protection unit is connected with the sampling unit, and is used for determining a working mode and transmitting a level signal to the switching transistor according to the current value of the own side bus; the switching transitor is connected with the three units respectively, and is switched on or off according to the magnitude of the level signal; the logical control unit is used for determining to start up the own side power supply incoming line or the opposite side bus to supply power to the own side bus according to the three-phase voltage values of the own and opposite side power supply incoming lines when the switching transistor is switched on. The spare power automatic switching emergency device is simple in structure and is convenient to detach, the risk of long-time voltage loss of the own side bus is avoided, and a large quantity of financial resources and time are saved.

Description

technical field [0001] The invention relates to the technical field of power system substation power consumption systems in electric power systems, and in particular to a device and method for automatic switch-on emergency of substation power system power consumption systems. Background technique [0002] Such as figure 1 As shown, the substation station power system provides a stable and reliable 380V AC power supply for the AC loads in the substation. Its common configuration is that the I-section bus a' and the II-section bus b' operate separately, and the I-section bus a' and the II bus b 'The AC power is respectively drawn from the low-voltage side of two station transformers that are mutually standby, that is, the I-section busbar a' is transformed from a 10KV AC power supply to #1 station through the variable height switch ST1 of the station transformer and other transformer devices The incoming line of station #1 of power supply P1 supplies power, and the busbar b' ...

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Problems solved by technology

[0003] At present, the self-switching devices of substation station power system are widely used in various substations of the power system. The device involves too many manufacturers and the product types are too complicated. The disadvantages are: 1. Due to too many manufacturers, once If the device fails, it needs to be returned to different manufacturers for replacement, which wastes a lot of time. In particular, some types of devices have been discontinued, and the waiting time for upgrading is too long, which increases the risk of busbar voltage loss in the station power system; 2. The product type is too complicated. It is not conducive to maintenance, and at the same time, in order to ensure that device failures can be quickly resolved, it is necessary to reserve a large number of spare devices of various product types, thus wasting a lot of financial resources

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