Test device for undissolved current loop bus differential protection on power system bus
A technology of current loop and power system, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of inaccuracy, failure to verify the action value, and inaccuracy of test results.
Active Publication Date: 2016-03-02
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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Problems solved by technology
[0008] For method two: there is no risk of operating on the running current loop, but blindly adding a large current, the action value of the bus differential protection at that time cannot be verified, and the test results are not accurate enough
[0009] That is to say, there are deficiencies in the design of the existing bus differential protection device, which makes the operation risk high or complicated and the test results are not accurate enough when carrying out the bus differential protection test
Method used
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[0055] Such as figure 2 As shown, the present invention is used in the embodiment of the test device for the protection of the current loop bus differential protection on the power system bus, including:
[0056] Core board module 7 is a dual-core processor OMAPL138, based on ARM926EJ-S TM And C674xDSP core, the core board module 7 leads to two SPI bus interfaces and externally connects 4 pieces of AD7606 signal acquisition chips and 1 piece of AD5362DA chip; AD5362DA chip has eight channels, of which 3 channels are used as three-phase 50Hz AC voltage signal output, and 3 channels are used as three-phase 50Hz AC current signal output; AD7606 signal acquisition chip has eight channels of ADC input, 3 channels are three-phase AC voltage AD acquisition and 3 channels are three-phase AC current AD acquisition, so that high-precision, stable voltage source and current source can be adjusted Analog signal output;
[0057] Peripheral man-machine interface module 8 is a base plate,...
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The invention discloses an unfastening-free current loop bus bar differential protection test device in use for a power system bus bar. The unfastening-free current loop bus bar differential protection test device comprises a core board module 7, a peripheral human-computer interface module 8, a current source module 10, a switch quantity control module 12 and a power supply source module 13, wherein the switch quantity control module 12 is connected with the core board module 7 through photoelectric isolation. The unfastening-free current loop bus bar differential protection test device is safe, simple and precise in a bus bar differential protection test.
Description
technical field [0001] The invention relates to a test device for the bus difference protection test device of the free current loop on the bus of the electric power system. Background technique [0002] Bus differential protection refers to a current differential protection method on the bus of the power system. Such as figure 1 As shown, a plurality of branches 3 are connected to the busbar 1 and the busbar 2, and a branch switch 4 and a current transformer 5 are connected in series in each branch. Some branch current flows into the busbar, and some branch current flows out of the busbar. According to the principle of energy conservation, when the bus is in normal operation, the current flowing into all branches should be equal to the current flowing out of the bus. When the busbar is faulty, part of the current flows out from the fault point, so that the inflow current of all branch switches on the busbar is not equal to the outflow current. A differential current is ...
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IPC IPC(8): G01R31/00
Inventor 王文洪张言权陈泗贞卢迪勇邓效荣曾林关志强冯华然席立平
Owner GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU