Wireless long-distance digital alarm meter reading terminal and system for monitoring metering fault by null-balance method

Abstract

The invention relates to a wireless long-distance digital alarm meter reading monitoring system for a zero balancing method metering fault monitor which is composed of a zero balancing method metering fault monitoring electric energy meter formed by a zero balancing method triphase current fault monitoring circuit U3 and a common electricity meter U1 and developed according to a zero balancing method metering fault monitoring principle of the invention, a wireless long-distance digital alarm meter reading monitoring terminal and a center receive / dispatch main machine. Using the principle of the invention, the faults such as secondary circuit spontaneous combustion and distributary stealing electricity can be monitored and distinguished. U1, U3 and U2 together form the metering fault monitoring electric energy meter terminal and the principle is shown as a figure. The system combines the metering fault monitoring alarm control and data sending and reading and is suitable for a power supply station area.

Description

technical field [0001] The invention belongs to the application field of electric energy measurement and monitoring wireless alarm. It is a measurement failure monitoring electric energy meter and a wireless alarm circuit developed by applying the "zero balance method measurement failure monitoring principle" and the implementation circuit of the present invention, adding digital temperature monitoring and alarm, anti-theft monitoring and alarm , Other alarm (such as unpacking alarm) monitoring circuit, integrated multi-functional measurement fault monitoring wireless data transmission alarm meter terminal, wireless remote data transmission alarm meter reading terminal and system composed of central transceiver host. Mainly used in 10kv line distribution station area. Background technique [0002] At present, metering faults and power theft problems often occur in rural transformer stations. Manually searching for hidden dangers of metering faults is a waste of manpower and ...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to detect faults such as secondary circuits of three-phase meters and external shunt stealing electricity. At present, there are no effective monitoring methods and products. Only the three-phase voltage range can be judged to detect voltage loss.

As for the current loop fault, some measure the three-phase current amplitude and judge the unbalance degree of the three-phase current, but they cannot effectively judge whether there is a secondary circuit fault or a current shunt fault.

[0005] At present, some multi-function electric energy meters can measure voltage phase loss, three-phase current imbalance, voltage and current phase sequence connection errors, and current transformer ratio errors, internal shunts, poor contact of secondary circuits, short circuits, and open circuits Metering faults caused by , shunting and stealing electricity, etc., cannot be detected at present

[0006] If the core circuit of the existing metering detector is added to the metering box, the cost is high and it is not feasible. Therefore, it is necessary to develop a new monitoring principle method and implementation circuit, and add it to the metering box or electric energy meter to monitor metering faults and alarm in real time. Timely detection of potential measurement failures

[0007] At present, the distribution automation of each 10KV line distribution substation in the power supply system substation has not yet developed, because the situation is complicated and there is no good development model

[0008] The current situation of the additional transformer anti-theft and over-temperature alarm of the present invention is: power is sent during drainage and irrigation in the agricultural row area, and power is cut off during slack. During this period, transformer theft often occurs, and there is no complete monitoring and alarm protection system, and the transformer anti-theft alarm Although the system has some line applications, it has not been popularized and applied because of single function, low practicability, low cost performance, and high networking costs are difficult to implement; transformers are often burnt out due to overheating and overloading, and some people trial-produce a temperature monitoring and alarm system. However, the application has not been implemented because of the same reasons as the anti-theft alarm; manual meter reading is a waste of manpower, and wireless remote meter reading has been applied in recent years, but it has not been well implemented in 10KV lines. The reason is still single function, high cost, and low cost performance. , failed to implement the app

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