Cable sheath protector monitoring system

Abstract

The invention provides a cable sheath protector monitoring system which comprises a current transformer, a remote monitoring terminal, a control circuit board, a battery case, a secondary protection mechanism and a fixed base plate. The control circuit board and the remote monitoring terminal are correspondingly connected through a wireless network. The control circuit board, the battery case, and the secondary protection mechanism are arranged on the fixed base plate. The secondary protection mechanism comprises a movable connection bracket, a pushing mechanism and a second cable sheath protector. The battery case, the pushing mechanism and the second cable sheath protector are connected to the control circuit board correspondingly. Through the current transformer in the invention, the current in the cable sheath protector can be monitored in real time, the problems of a cable can be timely found, when the original cable sheath protector of the cable sheath has a problem, the secondary protection of the cable sheath can be carried out through starting the second cable sheath protector.

Description

technical field [0001] The invention relates to a monitoring system for a cable sheath protector. Background technique [0002] With the continuous development of social economy, there are more and more power construction projects, resulting in more and more high-voltage cables being erected. In the existing electrification technology, power cables with voltage levels of 35KV, 66KV and above are all single-core cables. During cable erection, one end of the cable metal sheath is generally connected to the ground in parallel with three phases, and the other end is not grounded. 35kV large-section power cables The power cables with voltage levels of 66kV, 110kV and above are all single-core cables. One end of the cable metal sheath is connected to three phases and grounded, and the other end is not grounded. During the normal operation of the cable, when the lightning wave or internal overvoltage flows along the cable core, a high impact overvoltage will appear at the unground...

AI Technical Summary

Problems solved by technology

During the normal operation of the cable, when the lightning wave or internal overvoltage flows along the cable core, a high impact overvoltage will appear at the ungrounded end of the cable metal sheath, or when the system short-circuit accident current flows through the cable core , the ungrounded end of the sheath will also have a high power frequency induced overvoltage. The above overvoltage may break down the insulation of the outer sheath of the cable, causing multi-point grounding faults on the metal sheath of the cable, seriously affecting the normal operation of the power cable or even greatly reducing In order to limit the induced voltage and fault overvoltage on the metal sheath of the power cable and avoid the formation of circulating current in the sheath, one end of the cable metal sheath is directly grounded, and the other end is grounded through the cable sheath protector.

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