Online monitoring method for insulation state of cable for transformer substation
A technology for cable insulation and substation, which is applied in the field of online monitoring of cable insulation status for substation stations, can solve the problems of long blackout time, low efficiency, and rare products, and achieves the effects of convenient application, simple principle, and reliable monitoring and maintenance.
Active Publication Date: 2022-04-22
广东电网有限责任公司惠州供电局
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Problems solved by technology
The off-line distance measurement method cuts off the power after the fault occurs and untie the power cable, and tests the fault distance through related equipment. This method has a long power outage time and affects social and economic production.
In addition, the offline detection method is to use manpower and material resources to find the cause and locate the fault point after the fault occurs, which is very inefficient
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[0094] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all Example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0095] The present invention proposes a method for on-line monitoring of cable insulation status in substations, and the corresponding hardware system schematic diagram is as follows figure 1 As shown, it includes a monitoring master device A, a monitoring slave device B, coupler A and coupler B;
[0096] Among them, the monitoring master device A is used to transmit high-frequency test signals, collect and analyze the reflected high-fr...
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The invention provides an on-line monitoring method for the insulation state of a cable for a transformer substation, and the method comprises the steps: connecting two ends of a to-be-detected cable to a monitoring master device A and a monitoring slave device B through a coupler A and a coupler B respectively, and injecting a high-frequency test signal into the to-be-detected cable through the monitoring master device A and the monitoring slave device B respectively, the method comprises the following steps: acquiring a to-be-tested cable, respectively acquiring reflected high-frequency test signals in the to-be-tested cable, performing signal processing by adopting a frequency domain peak iterative search algorithm, extracting parameter information of a reflection point, and comprehensively monitoring parameter information at two ends of a master device A and a slave device B to judge the insulation aging state of the to-be-tested cable. By using a large number of power line carrier networks in the middle and low voltage power distribution network, the cable in the middle and low voltage power distribution network can be monitored on line in an omnibearing manner without adding extra hardware equipment, and a more reliable and accurate basis is provided for monitoring and maintenance of the cable for the transformer substation.
Description
technical field [0001] The invention relates to the technical field of electric power secondary equipment, in particular to an on-line monitoring method for the insulation state of cables used in substations. Background technique [0002] With the rapid development of urban construction, power cables have gradually replaced overhead lines and become the main force of urban power transmission and distribution networks due to their small footprint and environmental friendliness. In recent years, there have been many short-circuit faults caused by the insulation reduction of power cables in substations in power grid companies. Since the AC and DC cables in the substation are laid together in the cable trench, when a short-circuit fault occurs in one cable, the short-circuit current will burn the entire cable in the trench. , resulting in equipment malfunction and refusal to move. Due to the long cable transmission distance, many branch lines, harsh environmental and climatic c...
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Login to View More IPC IPC(8): G01R31/12G01R31/08
CPCG01R31/1272G01R31/086G01R31/088Y04S10/16Y02E60/00
Inventor 张大兴黄泽荣尹星光李贤靓蔡冰子袁昊宇田明明李泽基王掬涵袁英平温振兴
Owner 广东电网有限责任公司惠州供电局