A high-precision intelligent tester for loop resistance
A loop resistance, high-precision technology, applied in the measurement of resistance/reactance/impedance, instruments, measuring devices, etc., can solve the problem of inaccurate measurement results, achieve strong anti-interference ability, avoid the influence of the normal operation of the power system, eliminate Effects of Common Mode Interference Voltage
Active Publication Date: 2017-07-04
STATE GRID CORP OF CHINA +1
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[0003] The purpose of the embodiments of the present invention is to provide a high-precision loop resistance intelligent tester, which aims to solve the problem of inaccurate measurement results caused by external electromagnetic, voltage and other interference signals and internal errors of the instrument itself.
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[0014] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0015] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0016] like figure 1 As shown, the high-precision loop resistance intelligent tester of the embodiment of the present invention is mainly composed of: differential T-type operational amplifier circuit 1, single-chip microcomputer 2, control button / knob 3, 100A constant current source 4, high-precision constant current source 5, Composed of current sampling resistor 6, amplifier 7, measurement result display 8, and DC double-arm bridge 9;
[0017] The device und...
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The invention discloses a high-precision intelligent loop resistance tester. The high-precision intelligent loop resistance tester comprises a T-type differential operational amplifier circuit, a single-chip microcomputer, a control button / knob, a 100 A constant-current source, a high-precision constant-current source, a current sampling resistor, an amplifier and a measurement result display. By adopting the T-type differential operational amplifier circuit to complete sampling / amplification of loop resistance, common-mode interference voltage caused by electromagnetism is eliminated, and the measurement precision is improved. By adopting the median average filtering programmed algorithm, interference is eliminated, and the measurement precision is improved. The external calibration function is additionally provided, the external high-precision constant-current source is utilized to achieve the calibration function, and therefore the problem that an internal constant-current source is inaccurate in adjustment is avoided, and the measurement precision and the intelligence of the tester are improved. The precision and the intelligence of the tester are improved, and the influence on normal operation of an electric system from wrong measurement results of a traditional loop resistance tester is effectively avoided.
Description
technical field [0001] The invention belongs to the technical application field of substation electrical test tools, and in particular relates to a high-precision intelligent loop resistance tester. Background technique [0002] The loop resistance tester is a commonly used test instrument in the power system, and the loop resistance test method generally adopts a typical four-wire sampling measurement method. When the currently used loop resistance tester is used in the field, due to the electromagnetic interference of other equipment in the power system and the error of the constant current source and its sampling resistance inside the instrument itself, it is very easy to cause adverse effects on the measurement results. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a high-precision intelligent tester for loop resistance, aiming to solve the problem of inaccurate measurement results caused by external electromag...
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IPC IPC(8): G01R27/14
Inventor 王泉乐
Owner STATE GRID CORP OF CHINA