A test terminal assembly for electric energy metering

Abstract

The invention relates to a test wiring terminal component for metering electric energy. The test wiring terminal component comprises a support plate with guide rails on the left side and the right side, A-C phase current wiring terminals, a zero-phase current wiring terminal, A-C phase voltage wiring terminals, a zero-phase voltage wiring terminal, a first plug and a second plug, wherein the various wiring terminals are installed on the guide rails of the support plate in sequence. The test wiring terminal component for metering electric energy has the benefits that the work efficiency when a meter is changed is improved; an open circuit of a current secondary circuit, a short-circuit of a voltage secondary circuit or a grounding accident are prevented effectively; the workload of infrastructure construction workers is reduced; the wire checking time when a metering circuit fails is also shortened; the voltage loss of a voltage secondary circuit caused by working is avoided, so that the electricity retroactive work is reduced; voltage short-circuit or grounding accidents are prevented effectively during work; the disadvantages caused by the current measurement by using a current clamp are overcome; the process of changing the socket of the wiring terminal is simple.

Description

technical field [0001] The invention relates to a test connection terminal assembly for electric energy metering, which is used for on-site calibration of electric energy meters and replacement of electric energy meters by electric energy metering professionals. Background technique [0002] Due to the display failure of the electric energy meter screen, measurement error exceeding the limit, program failure, internal voltage component failure, internal current component failure, RS485 communication module failure and other reasons, the electric energy meter should be replaced, and it should be replaced regularly according to the measurement regulations. Every year, the power supply companies in various cities in Hebei Southern Grid replace a large number of electric energy meters; in addition, the on-site calibration of electric energy meters is also an important item in the daily work items of the metering profession. [0003] At present, the current situation of the secon...

AI Technical Summary

Problems solved by technology

Due to the shape (plug-in type) of the short terminal, sometimes the contact area with the crimping screw is very small, which is easy to cause an open circuit, endangering the safety of people, equipment and power grid

[0006] (3) In some substations, the terminals are aging and the contact resistance value is large. Sometimes it is necessary to short-circuit two or even three short-circuits to replace the meter, which poses a great safety risk.

During the working process, since the secondary voltage line at the end of the electric energy meter is always charged, the staff must be very careful, otherwise it is easy to cause a short circuit of the secondary circuit of the voltage or a grounding accident.

One point that needs special emphasis is that the metering voltage secondary circuit and the protection voltage secondary circuit of some substations are shared circuits. If the metering secondary voltage circuit is short-circuited or grounded, the protection voltage will also be lost at this time, and the protection device will The protection function is lost. If the line fails at this time, the protection device will not operate, and the consequences will be disastrous

[0008] (5) Some substations have installed a test junction box in the metering secondary circuit, which reduces the risk of replacing and calibrating the energy meter to a certain extent and improves work efficiency, but this is still not the best

For the current secondary line covered with a plastic sleeve, the jaws of the current clamp often cannot be completely closed during current measurement, the measured value is inaccurate, the measurement result is meaningless, and the calibration work cannot be performed.

Compared with the first measurement method, the accuracy of the second measurement method is lower and the measurement error is larger

In addition, in actual work, due to the large jaws of the current clamp, in order to conveniently pick up the current, the staff will often twist the measured current wire, which may cause loosening of the wiring screws or open circuit of the secondary current circuit.

The voltage test line adopts metal clips. When connecting the voltage test line, the staff need to clamp the clips to the Ua, Ub, Uc, and Un voltage terminals (screws) of the voltage secondary circuit. Due to the weight of the voltage test line, the When calibrating the electric energy meter, the phenomenon of clip slipping and popping often occurs (even if the voltage test line is found in a suitable position as a support to overcome its own weight, sometimes the clip slips and pops up), which poses a safety hazard

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