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Using Transient 3i 0 3u 0 Constituted zero sequence transient current direction protection circuit

A transient current and directional protection technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the failure of the line selection function, the inability to achieve the correct rate of line selection, and the lack of line selection sensitivity. and other problems, to achieve the effect of high sensitivity

Active Publication Date: 2021-11-30
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the small-current grounding line selection devices produced in China cannot achieve a 100% correct line selection rate. The main reason is that the line selection principle composed of steady-state currents is insufficient in line selection sensitivity when grounding through resistance, especially through arc suppression coils. In the grounding system, the residual current after compensation is very small. This residual current is an inductive current, and its direction is the same as that of the non-faulty line grounding capacitor current, and the line selection function will be invalid.

Method used

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  • Using Transient 3i <sub>0</sub> 3u <sub>0</sub> Constituted zero sequence transient current direction protection circuit
  • Using Transient 3i <sub>0</sub> 3u <sub>0</sub> Constituted zero sequence transient current direction protection circuit

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing and specific embodiment, utilize transient state 3I that the present invention provides 0 3U 0 The composed zero-sequence transient current direction protection circuit is described in detail.

[0013] Such as figure 2 As shown, the present invention provides the use of transient 3I 0 3U 0 The formed zero-sequence transient current direction protection circuit includes:

[0014] Voltage converter YH, reactance converter KH, first capacitor C1-sixth capacitor C6, first resistor R1-thirteenth resistor R13, first rectifier bridge Z1, second rectifier bridge Z2, ninth diode D9- The thirteenth diode D13, the first triode S1 to the fourth triode S4 and the relay J, wherein: the secondary side of the voltage converter YH and the reactance converter KH each have two identical secondary coils; After the first secondary coil of the converter YH and the first secondary coil of the reactance converter KH are connected in series i...

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Abstract

A method using the transient 3I 0 3U 0 Constituted zero-sequence transient current direction protection circuit. It includes: voltage converter YH, reactance converter KH, first capacitor C1-sixth capacitor C6, first resistor R1-thirteenth resistor R13, first rectifier bridge D1-D4, second rectifier bridge D5-D8, The ninth diode D9-the thirteenth diode D13, the first triode S1-the fourth triode S4 and the relay J. Provided by the present invention utilizes transient 3I 0 3U 0 The beneficial effects of the formed zero-sequence transient current direction protection circuit: 1: The transient zero-sequence current direction protection can be used for the neutral point ungrounded system or the arc suppressing coil grounded system. 2: High sensitivity, not affected by grounding resistance.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, in particular to a method for utilizing transient 3I 0 3U 0 Constituted zero-sequence transient current direction protection circuit. Background technique [0002] In my country, the neutral ungrounded or neutral grounded system of transformers in 66kV, 35kV, and 10kV power distribution systems is commonly referred to as a small current grounded system. Maintain symmetry, and the regulations stipulate that it can continue to run for 1-2 hours. If the fault point can be quickly found or the load can be transferred from the fault point in time, it can be achieved without power failure. This is its biggest advantage. At present, the small-current grounding line selection devices produced in China cannot achieve a 100% correct line selection rate. The main reason is that the line selection principle composed of steady-state currents is insufficient in line selection sensitivity when g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/32
CPCH02H3/32
Inventor 宁宁白慧宁韦豪宁一殷军钟珊宁景云吕跃
Owner STATE GRID TIANJIN ELECTRIC POWER