Method for on-line assessment of insulation on-line monitoring system of substation
A technology for monitoring systems and substations. It is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables. It can solve problems such as danger, personal threat, equipment safety, and monitoring equipment failure.
Active Publication Date: 2012-07-04
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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However, the above method is very dangerous. Once the grounding port of the end screen of the primary device is accidentally disconnected from the ground, the end screen port will form a high voltage, which seriously threatens the safety of people and equipment.
In addition, when the on-line monitoring data of capacitive equipment and lightning arrester insulation are abnormal, there is a possibility that the monitoring equipment itself may fail. Therefore, it is necessary to distinguish the type of failure, locate an equipment failure or monitor equipment failure
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[0025] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0026] When the insulation status monitoring data of capacitive equipment and lightning arresters in substations is abnormal, there is often the possibility that the online monitoring equipment itself is faulty. Therefore, how to distinguish whether the fault type is a primary equipment (ie capacitive equipment, lightning arrester) fault or an online monitoring system fault is a A necessary part of the self-assessment of the insulation on-line monitoring system.
[0027] Such as Figure 5 As shown, the insulation on-line monitoring system includes:
[0028] A plurality of current sensors 51 are respectively used to detect the leakage current of each capacitive device and arrester;
[0029] An online monitoring unit 52 for judging whether the insulation characteristic quantity of each capacitive device an...
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The invention provides a method for on-line assessment of an insulation on-line monitoring system of a substation, which comprises the following steps: (1) carrying out frequency conversion on a power supply signal which is outputted by the on-line monitoring system and has the frequency of M Hz through a frequency conversion circuit and producing a current signal with the frequency of N Hz, wherein N is not equal to M; (2) outputting the current signal with the frequency of N Hz to a plurality of series-connected loops consisting of current sensors and a reference current sensor of the on-line monitoring system in a through manner; and (3) comparing the phase of the current signal which is outputted by the current sensor and has the frequency of N Hz with the phase of the current signal which is outputted by the reference current sensor of the on-line monitoring system and has the frequency of N Hz in the same series-connected loop. The method for on-line assessment of the insulationon-line monitoring system of the substation can safely assess working situations of capacitive equipment and the insulation on-line monitoring system of a lightning arrester under the working situation of the substation.
Description
technical field [0001] The invention relates to a method for evaluating a substation insulation on-line monitoring system, in particular to a method for on-line evaluating a substation insulation on-line monitoring system. Background technique [0002] Due to the limitations of preventive tests on electrical equipment, the online monitoring system for electrical equipment has been widely used under the general trend of condition-based maintenance in power systems. The online monitoring system for insulation of capacitive equipment and arresters is a branch of the online monitoring system for electrical equipment. The on-line monitoring system for capacitive equipment and arrester insulation monitors the leakage current Ic of capacitive equipment and the leakage current Ic of arresters. R And the associated PT (potential transformer) secondary metering winding voltage (the secondary metering winding voltage reflects the primary side voltage within the allowable range of error...
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IPC IPC(8): G01R31/00G01R31/02
Inventor 杜忠东邓泽官廖源
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST