Working condition monitoring and three-phase load balance automatic adjustment system in low-voltage station area

Abstract

The invention discloses a system for monitoring the working condition of a low-voltage station area and automatically adjusting the three-phase load balance, which includes a low-voltage multi-capacity capacitor, an automatic phase change switch, a residual current circuit breaker, a distribution network monitoring terminal, and a system platform. The network monitoring terminal is connected to the system platform through the GPRS network, and the residual current circuit breaker is installed on each power supply branch on the low-voltage side of the distribution network with the low-voltage multi-capacity capacitor connected in series. The residual current circuit breaker is connected through the 485 communication mode It is connected with the monitoring terminal, and the automatic reversing switch is connected with the monitoring terminal of the distribution network through the wireless power carrier, wherein the low-voltage multi-capacity capacitor includes a plurality of parallel-connected equal-capacity charging elements, and the parallel-connected lines of the equal-capacity charging elements The electric control switch is connected in series to realize the matching of capacitance compensation level. The invention can realize the automatic adjustment of the three-phase load balance and the matching of the reactive power compensation capacity level, reduce the electric energy loss in the station area, and reduce the frequency of the three-phase automatic adjustment and commutation in the peak period.

Description

technical field [0001] The invention relates to the technical field of data acquisition and monitoring, in particular to a system for monitoring working conditions of a low-pressure station area and automatically adjusting three-phase load balance. Background technique [0002] The problem of three-phase load balance adjustment in the low-voltage station area has always been one of the main problems that plague the power supply company. Most of the low-voltage power grids are stepped down by 10 / 0.4KV transformers to supply power to users in a three-phase four-wire system. It is a three-phase production A power supply network in which electricity consumption is mixed with single-phase loads. When installing single-phase users, the power supply department should tap the single-phase load on the three phases A, B, and C in a balanced manner. However, in actual work and operation, due to the signs of the line, the negligence of the power-connecting personnel, and the uncontroll...

AI Technical Summary

Problems solved by technology

However, the above-mentioned low-voltage three-phase load unbalance automatic adjustment system cannot perform real-time monitoring according to the reactive power load monitoring device connected to the main controller. When the capacity level of reactive power compensation is low, each branch runs under heavy load during the peak period of power consumption. At this time, the three-phase adjustment frequency will be operated very frequently, which is not good for the stable operation of the equipment.

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