Density relay secondary cable core collection device

Abstract

The invention discloses a density relay secondary cable core collection device.The density relay secondary cable core collection device is characterized in that a strip-shaped substrate of which the section is shaped like a square is arranged, the strip-shaped substrate is divided into seven units in the length direction, each unit on the front end face of the strip-shaped substrate is provided with three core wiring terminals, each unit on the rear end face of the strip-shaped substrate is provided with one wiring terminal, and every three core wiring terminals are connected in parallel through a switch on the upper end face of the strip-shaped substrate and then communicated with the corresponding wiring terminal.The density relay secondary cable core collection device has the following advantages that the defect that two cable cores need to be crimped on a terminal board is effectively overcome, and the problem that a signal cannot be sent out due to unfirm connection of cables is avoided; the cumbersome degree of plug box disassembling and assembling needed by density relay calibration is greatly simplified; the short-circuit risks which exist after a density relay is mounted and put into operation and in the density relay calibration working process are effectively reduced.

Description

technical field [0001] The invention relates to a power supply appliance in an electric power system, in particular to a secondary cable core collecting device for a density relay with simple operation and high work efficiency. Background technique [0002] For the safety of power supply, the State Grid Corporation of China clearly stipulates in the 18 anti-accident measures that "the circuit breakers with 220kV and above GIS sub-box structure should be equipped with independent density relays", but most of the GIS equipment put into operation before 2006 are three-phase shared If a density relay does not meet the above countermeasures, it is necessary to install air chamber density relays on the remaining two phases. During the process of installing density relays, the cables of the three-phase density relays need to be connected in parallel. The traditional construction method is to connect A The phase signal line is connected to phase B in parallel, and then phase B is co...

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that more than two cable cores need to be crimped on one terminal row in the plug box of the secondary cable. The blocking signal cannot be accurately transmitted to the background protection device; second, it is easy to cause problems such as a short circuit due to the failure of the back cover of the cable plug box

At the same time, when performing density relay calibration work, it is necessary to remove the plug box of the density point adder, and then clamp the calibration wire to the terminal of the density relay. The operation is complicated, time-consuming and laborious. , it is easy to cause output short circuit during testing

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