Method for performing live-line evaluation on online insulation monitoring system of substation
A monitoring system and substation technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as monitoring equipment's own failure, threats to personal life, equipment safety, and danger, and achieve the effect of ensuring safety
Active Publication Date: 2010-06-09
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology
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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[0045] According to a specific implementation manner, the feedthrough transformer that can directly obtain current is a clamp ammeter;
[0046] Step 72: Input the current output from the secondary output terminal of the feedthrough transformer that can directly obtain current into the power amplifier circuit;
[0047] Step 73: Perform orthogonal transformation on the signal output by the power amplifying circuit through the orthogonal transformation circuit;
[0048] Step 74: Input the signal after the orthogonal transformation into the program-controlled gain amplifier circuit, and control the gain of the program-controlled gain amplifier circuit through the control circuit;
[0049] Step 75: Stabilize the excitation current signal ΔI output by the programmable gain amplifier circuit;
[0050] Step 76: output the steady-current excitation current signal ΔI through the core to the external leakage current monitoring transformer;
[0051] Step 77: Change the gain of the progr...
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The invention provides a method for performing live-line evaluation on an online insulation monitoring system of a substation, which comprises the following steps of: (1) obtaining the leakage current I of capacitive equipment and a lightning protector through a straight-through mutual inductor capable of directly obtaining current; (2) performing orthogonal conversion on the current output by the second output end of the straight-through mutual inductor capable of directly obtaining the current through an orthogonal conversion circuit; (3) inputting a signal obtained by the orthogonal conversion into a programmable gain amplification circuit; (4) outputting an excitation current signal Delta I output by the programmable gain amplification circuit to an external leakage current monitoring transformer in a straight-through way; and (5) changing the gain of the programmable gain amplification circuit and comparing an insulation characteristic quantity change detected by the online insulation monitoring system of the substation with an actual insulation characteristic quantity change. The method can securely evaluate the working condition of the online insulation monitoring system for the capacitive equipment and the lightning protector under the condition that the substation works.
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 evaluating a substation insulation on-line monitoring system with electricity. 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...
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Inventor 杜忠东邓泽官廖源
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST