Electric energy metering device verification system before normal operation of user electrical network

Abstract

The invention discloses an electric energy metering device verification system before normal operation of a user electrical network. The system is composed of a main test circuit and a control circuit. The main test circuit includes an A-phase, B-phase, and a C-phase circuit, a standard simulated load, and an A-phase relay normally-open contact, a B-phase relay normally-open contact, and a C-phase relay normally-open contact. One end of each of the A-phase relay normally-open contact, the B-phase relay normally-open contact, and the C-phase relay normally-open contact is connected with the A-phase, B-phase, and a C-phase circuit and the other end is connected together and is connected with one end of the standard simulated load. The control circuit includes an A-phase relay, a B-phase relay, a C-phase relay, and a remote control circuit; the remote control circuit contains a remote controller and a remote control receiver; the A-phase relay, the B-phase relay, and the C-phase relay are electrically connected in an interlocking mode; and three groups of switch control terminals are arranged at the remote control receiver and are respectively connected to coil control branch circuits of the A-phase relay, the B-phase relay, and the C-phase relay. According to the invention, occurrence of a personal injury accident during filed electricity connection detection can be effectively avoided; safety and reliability of field detection of the meter installation and electricity connection link can be improved; detection accuracy is substantially improved; and the detection efficiency is also enhanced.

Description

technical field [0001] The invention relates to a verification system for an electric energy metering device before normal operation of a power grid of a user, and belongs to the technical field of commercial power distribution. Background technique [0002] According to the "State Grid Corporation of China Industry Expansion Report Installation Work Specifications", after the meter installation and connection link is connected to the power, it should be checked whether the electric energy metering device, such as the electric energy meter and the secondary circuit connection of the meter, are running normally. Before the normal load operation of the new user, the load must be added to each phase to check whether the pulse of the electric energy meter is normal, and the on-site judgment is made whether the wiring of the secondary circuit of the metering is correct. [0003] At present, the detection method of meter installation and connection is the working method of "one li...

AI Technical Summary

Problems solved by technology

There are many defects and drawbacks in this detection method: 1. Low safety and reliability

The original detection method uses the heating coil load work "one line, one zero" phase-by-phase electrification detection, the heating coil needs to dissipate heat in water, the heating of the heating coil will cause aging of the wiring, the equipment itself is easy to discharge to the water, and there are hidden dangers to personal safety; Electricity connection test is carried out for each phase. Because the distance between the phase lines is small, it is easy to cause a short circuit between phases when people connect the electricity directly on site, resulting in personal electric shock, arc burns and other safety accidents; because the switchboard has neutral point grounding protection, when using When "one line, one zero" is detected phase by phase, it is easy to cause "one line, one zero" short circuit accident, leading to safety accidents

2. The original on-site inspection work method is cumbersome

The original heating ring "one line, one zero" plus load detection, according to the "State Grid Electricity Safety Regulations" requires an on-site monitoring system, but the original detection method requires the cooperation of multiple people, one person is charged and the other is tested phase by phase, and the other judges the pulse of the meter. It is cumbersome and virtually increases work pressure

3. In the original on-site inspection method, the work of the inspectors is not coordinated, and inspection errors are prone to occur.

When the metering device and the switchboard are not in the same place, the coordination between the inspectors is cumbersome during the inspection, and it is easy to cause mistakes between the wiring personnel and the judgment personnel.

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