A live evaluation method for substation insulation on-line monitoring system
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: 2011-11-30
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 live evaluation substation insulation on-line monitoring system, which includes the following steps: (1) Obtain the leakage current I of capacitive equipment and lightning arresters through a feed-through transformer that can directly obtain current; Alternating conversion circuit, the current output from the secondary output terminal of the feedthrough transformer that can directly obtain the current is carried out orthogonal conversion; (3) the signal after the orthogonal conversion is input into the program-controlled gain amplifier circuit; (4) the obtained The excitation current signal ΔI output by the program-controlled gain amplifier circuit is output through the core to the external leakage current monitoring transformer; (5) change the gain of the program-controlled gain amplifier circuit, and compare the change of the insulation characteristic quantity detected by the substation insulation on-line monitoring system with the The actual insulation characteristic quantity changes. The invention can safely evaluate the working condition of the capacitive equipment and the insulation on-line monitoring system of the arrester under the working condition 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 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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IPC IPC(8): G01R31/00
Inventor 杜忠东邓泽官廖源
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST