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Automatic tracking small-current line selection device and line selection method

A technology of automatic tracking and line selection device, which is applied in fault location, fault detection according to conductor type, etc., can solve problems such as inability to remove faulty lines, protect dead zone, etc., and achieve the effect of improving line selection accuracy and simplifying calculation.

Pending Publication Date: 2019-03-08
张安斌
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Problems solved by technology

[0005] In addition, in the neutral point low-value resistor grounding system, the single-phase high-resistance grounding fault makes the current of the single-phase grounding fault line less than the protection setting value, resulting in the failure of the computer comprehensive protection to cut off the faulty line, forming a protection dead zone

Method used

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  • Automatic tracking small-current line selection device and line selection method
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  • Automatic tracking small-current line selection device and line selection method

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Embodiment Construction

[0054] In this embodiment, the automatic tracking small current line selection device is: a neutral point is set in the system of small current grounding mode, and a controllable impedance Z that can be automatically tracked and adjusted is set between the neutral point and the ground. T , the controllable impedance Z T The maximum value of Z TM Set according to system rated voltage; controllable impedance Z T It is based on the voltage of the system to ground, or according to the controllable impedance Z T current I N For tracking adjustment, the controllable impedance Z T The adjustment range is 0≤Z T ≤Z TM between.

[0055] Controllable impedance Z T The maximum value of Z TM Set according to the rated voltage of the system, such as a system with a rated voltage of 10kV, the maximum value Z TM Set it to 300Ω, when the single-phase metal is grounded, the neutral point power frequency voltage is up to 5.77kV, then the controllable impedance Z T The maximum current i...

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Abstract

The invention discloses an automatic tracking small-current line selection device and a line selection method. The device is characterized in that a neutral point is arranged in a system with a small-current grounding mode, a controllable impedance part capable of achieving automatic tracking adjustment is arranged between the neutral point and the ground, and a maximum value of the controllable impedance part is set according to the rated voltage of the system; the controllable impedance part is tracked and adjusted according to the system-to-ground voltage or the current of the controllableimpedance part. According to the device and the method, the zero sequence current of a fault line is maximized, the judgment precision of the line selection current is high, the fault line is accurately judged, and line selection is not affected by an arc suppression coil; moreover, the device can be applied to judgement of the fault line when a small-resistance grounding system is grounded with high resistance, and a protection dead zone of the neutral point small-resistance grounding system is removed.

Description

technical field [0001] The present invention relates to power protection equipment, more specifically a line selection device and a line selection method for single-phase ground faults in small current grounding systems, and can also be used for single-phase high-resistance ground faults in neutral point low-value resistor grounding systems line selection. Background technique [0002] Timely and accurate determination of ground loops is the basis for quickly eliminating single-phase ground faults, and it is also the core function of small current line selection. But the current line selection device often has misselection and missed selection, the effect is not satisfactory, and the accuracy of line selection is low. [0003] Since the small current grounding line selection device came out in the 1980s, it has undergone several technical updates, and the accuracy of its line selection has also been continuously improved, but there are still problems of high misjudgment rat...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 张安斌严孟琪
Owner 张安斌
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