Direction diagnosing system of grounded fault of small current grounded distribution system

A small current grounding and grounding fault technology, applied in the phase angle between voltage and current, measuring electricity, measuring electrical variables, etc., can solve the problems that single-phase grounding fault detection and reliable identification have not been completely solved, and achieve detection The method is novel, the cost is low, and the effect of facilitating installation

Active Publication Date: 2012-07-25
BEIHANG UNIV +1
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Problems solved by technology

The detection and reliable identification of single-phase-to-earth faults has not been completely solved

Method used

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  • Direction diagnosing system of grounded fault of small current grounded distribution system
  • Direction diagnosing system of grounded fault of small current grounded distribution system
  • Direction diagnosing system of grounded fault of small current grounded distribution system

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Embodiment Construction

[0029] see figure 1 As shown in the figure, the output voltage of channel A of the three-phase power supply in the figure is recorded as V a , the B-channel output voltage of the three-phase power supply is denoted as V b , the output voltage of circuit C of the three-phase power supply is denoted as V c ; ZCT is a zero-sequence current transformer (selecting Baoding Zhongbang Electric Co., Ltd. to produce the model ZB-LJ-120 current transformer), and the zero-sequence current detected by ZCT is denoted as I 0 ; The A-way load of the three-phase power supply is recorded as R 1 , the B-circuit load of the three-phase power supply is denoted as R 2 , the C-circuit load of the three-phase power supply is denoted as R 3 ; The neutral point of the three-phase power supply is grounded through the arc suppression coil L; the distributed capacitance of the A circuit on the power supply side to the ground is recorded as C 1 , capacitance C 1 The capacitance is denoted as AC 1 , ...

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Abstract

The invention discloses a direction diagnosing system of grounded fault of a small current grounded distribution system, which adopts a high voltage electric display HS connected on a switch to replace a zero sequence voltage transformer PT to detect a capacitive voltage U. For the small current grounded distribution system, based on the capacitive voltage U, when one-phase ground fault occurs at the load side, the zero sequence current I0 leads the capacitive voltage U with the leading angle theta2 being 0-180 degrees; when single-phase ground fault occurs at the power supply side, the zero sequence current I0 lags behind the capacitive voltage U with the lag angle theta1 being 0-90 degrees. Therefore, by extraction and treatment of steady component of ground fault of a feed line, the capacitive voltage U and zero sequence current I0 when the system faults is further detected to judge the direction of one-phase ground fault. The ground fault direction signal picked up by the ground fault direction diagnosing system provided by the invention can inform a controller of a power distribution station so that the controller acts correspondingly to the benefit of protecting the power distribution system.

Description

technical field [0001] The invention relates to a small current grounding power distribution system, more particularly, a grounding fault direction diagnosis system suitable for power distribution systems with neutral point not grounded, resistance grounded, and arc suppressing coil grounded. Background technique [0002] There are two types of neutral point grounding methods in power systems: large current grounding and small current grounding. [0003] The large current grounding method is the way that the neutral point is directly grounded or grounded through a small resistance. Its characteristic is that when a ground fault occurs in the system, especially when a single-phase ground fault occurs, the non-fault phase-to-ground voltage does not rise, but the ground phase fault current is relatively large, which will cause great damage to the power system itself and to adjacent communication lines and signal lines. danger and interference, so the faulty part must be remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R25/00
Inventor 武建文李平张路明廉世军
Owner BEIHANG UNIV
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