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Power cable monitoring device and method for monitoring power cable state using the same

A technology for power cables and monitoring devices, applied in measuring devices, measuring resistance/reactance/impedance, fault location, etc., can solve problems such as heavy workload, time-consuming and troublesome, difficult to meet safety, reliability, and high-quality requirements, and achieve Realize the effect of high and low voltage isolation and easy operation

Inactive Publication Date: 2008-06-11
赵瑞琳 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a heavy workload and requires multiple power outages to complete, which is time-consuming and troublesome, and it is difficult to meet the safety, reliability and high-quality requirements of today's rapidly developing science and technology for the power grid.

Method used

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  • Power cable monitoring device and method for monitoring power cable state using the same
  • Power cable monitoring device and method for monitoring power cable state using the same
  • Power cable monitoring device and method for monitoring power cable state using the same

Examples

Experimental program
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Effect test

Embodiment Construction

[0035] The power cable monitoring device of the present invention is shown in Figure 1. When the input monitoring command is "0", the output of the first optocoupler is "0", the two PWM controllers stop working, and the primary voltage of the sending transformer is "0". ", that is, no signal is applied to the cable under test, and the power cable monitoring device stops working.

[0036] When the input monitoring instruction is "1", the output of the first optocoupler is "1", the two PWM controllers work, the PWM-1 controller controls the conduction angle Ψ of the DC1 / DC2 converter, the power supply voltage U DC2 It is 12V, and the DC voltage U is obtained through oscillation, transformation and boosting, and rectification DC2 , different conduction angle Ψ will correspond to different output voltage U DC2 value.

[0037] The PWM-2 controller is used to control the DC2 / AC converter, the AC square wave frequency is 20kHz, and the AC amplitude is U DC2 The value of AC is the ...

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Abstract

The invention gives a monitoring device for conducting real-time monitoring of the power cable status, which comprises a transmitter and a receiver. The transmitter is provided with a transmission transformer harnessed on the power cable. The invention also gives the method for monitoring the power cable status by the power cable monitoring device. By utilizing the method, the security system can be established to realize the real-time monitoring and automatic alarming and the cable inquiring and finding without the change of the operation mode of the circuitry and the power cut, which is easy to install and operate and applicable to various monitoring of cable with shield and restrictive coating.

Description

technical field [0001] The invention relates to a power cable monitoring device and a method for monitoring the state of a power cable using the power cable monitoring device. Background technique [0002] With the improvement of urban beautification and power requirements, the number of cables used to transmit electric energy is increasing day by day, and the cable lines are all over the streets and alleys. In the cable pit, the cables laid in the same pit range from 3 to 5, and as many as 20 to 30, or even more. [0003] Structurally, power cables can be divided into two parts: the core and the protective layer. The innermost core is used to transmit electric energy, and the protective layer wrapped around the core has a multi-layer structure, which respectively realizes shielding, insulation, and anti-external damage. and other functions. In the protective layer, the material of the armor layer used to prevent external force damage and the shield layer used for electrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R27/02
Inventor 赵瑞琳陈能翀
Owner 赵瑞琳
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