Monitoring circuit for direct current output loop
A DC output and monitoring circuit technology, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problems of damaged relay protection equipment, difficult to find, lack of DC fault monitoring, etc., to reduce the damaged Risk, effect of safe use
Pending Publication Date: 2019-04-16
华润新能源(大同阳高)风能有限公司
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Problems solved by technology
[0004] And the output circuit of the relay protection test power panel is monitored by indicator lights, voltmeters, and ammeters, but the output circuit of the relay protection test power panel lacks the monitoring problem of DC faults, so there is a DC fault in the output circuit of the relay protection test power panel. When a fault occurs, it is not easy to be found in time, so it is easy to cause damage to the relay protection equipment
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[0059] optional, such as figure 2 , in another embodiment of the present invention, an implementation of the positive electrode monitoring branch 110, the specific structure includes: a first switch S1, a first resistor R1 and a coil 111 of a first DC relay; wherein:
[0060] The first resistor R1 is connected in parallel with the coil 111 of the first DC relay, and one end of the parallel connection is connected with one end of the first switch S1;
[0061] The other end of the first switch S1 serves as the positive input terminal of the positive pole monitoring branch 110 ; the control signal output terminal of the coil 111 of the first DC relay serves as the output terminal of the positive pole monitoring branch 110 .
[0062] Optionally, the first resistor R1 is a resistor with a resistance value of 20 kΩ.
[0063] The specific working principle is:
[0064] Close the first switch S1, the positive monitoring branch 110 is turned on, the current flows through the first r...
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The invention provides a monitoring circuit for a direct current output loop. According to the invention, direct current voltages output by the positive output end and the negative output end of the direct current output loop are monitored through a positive electrode monitoring branch and a negative electrode monitoring branch respectively; when the direct current voltage output by the positive output end of the direct current output loop rises above a first threshold voltage and the direct current voltage output by the negative output end of the direct current output loop falls below a fourth threshold voltage, a negative fault alarm branch outputs a first alarm signal; when the direct current voltage output by the positive output end of the direct current output loop falls below a second threshold voltage and the direct current voltage output by the negative output end of the direct current output loop rises above the fourth threshold voltage, a positive fault alarm branch outputs asecond alarm signal; and when the direct current output loop of a relay protection test power supply screen has a direct current fault, an alarm prompt is promptly issued to remind staff to check andsolve the fault.
Description
technical field [0001] The invention relates to the technical field of circuit protection, in particular to a monitoring circuit of a direct current output circuit. Background technique [0002] When expansion projects are carried out in power plants and substations, when the DC system is connected to the equipment, DC faults are prone to occur, which will cause malfunction of the relay protection device, and in severe cases, the relay protection device can be damaged. [0003] Therefore, before the DC system is connected to the equipment, it is necessary to use the relay protection test power panel to debug the equipment. Among them, the relay protection test power supply screen is connected to two 380 / 220V power supplies for power supply, and the two power supplies are mutually backup to ensure the reliability of the power supply for the relay protection test power supply screen. [0004] And the output circuit of the relay protection test power supply screen is monitored...
Claims
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IPC IPC(8): G01R19/165
CPCG01R19/165G01R19/16538
Inventor 张艳锋苏国伟杨海涛陆学敏王厚朋高志强杨慧剑冯琰海郭玉龙张艳平
Owner 华润新能源(大同阳高)风能有限公司