Device for monitoring working state of fuse

Abstract

The invention discloses a device for monitoring working or fusing state of a fuse, and relates to field of power transmission and distribution of power systems. The device for monitoring the working state of the fuse is connected in parallel near the fuse on a power transmission line. One end of the monitoring device is connected with a line load end, and the other end of the monitoring device is connected with a line power end. When the monitoring device monitors the information that the fuse in a three-phase power supply fuses and ages to be broken (no contact) or breaks down, comparison is carried out with the voltage in a monitoring module and after making judgment, the monitoring device sends a fault signal to give an alarm. At the same time, an indication output end sends the signal to electric equipment to cut off the power supply of the electric equipment so as to protect the electric equipment. The monitoring device improves the safety protection factor of a circuit and provides great convenience for the power transmission and distribution management of the power system.

Description

Technical field [0001] The invention relates to the field of power transmission and distribution of electric power systems, realizes the monitoring of the working or fusing state of fuses, can detect power line faults in time, realizes missing protection of power lines, and improves the safety and reliability of power distribution network operation. Background technique [0002] At present, in the power transmission and distribution safety protection system of the power system, a large number of fuses are used. In many cases, there are multiple sections of protection in one line, and each power facility and transmission terminal is protected by a fuse or a circuit breaker. And breaking, in order to prevent the impact of overload current on the line, transmission and distribution facilities and electrical equipment and cause damage, and prevent the occurrence of electrical safety accidents. However, there is generally no monitoring device, and the following disadvantages exis...

AI Technical Summary

Problems solved by technology

However, there is generally no monitoring device, and the following disadvantages exist in actual use:

[0003] 1. When an overload current occurs in the transmission line and the fuse plays a role in safe fusing, since each transmission line is connected to multiple power consumption units or output terminals, the staff often need to check and eliminate the accident point and cause of the accident one by one , Time-consuming and labor-intensive is not conducive to the rapid recovery of line power supply status, and has a certain impact on normal power supply;

[0004] 2. When one of the three-phase power supplies of the transmission line is missing, the other two often cannot be fused or broken in time because the power supply current is not overloaded and continue to work. There will be safety problems in power transmission, and it will also cause damage to power facilities. damage;

[0005] 3. In the operating environment where the circuit breaker is in a heated state for a long time, there will be aging of the fuse parts or mechanical contact points. If the daily inspection is not in place or replaced in time, there will be safety hazards in the circuit due to failure

[0006] Due to the above defects, the power supply line has certain potential safety hazards, and when a fault occurs, it is not conducive to inspection and quick elimination, which will adversely affect the restoration of normal power supply as soon as possible.

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