CN202276140U - Instantaneous single-phase ground fault handling device - Google Patents

Instantaneous single-phase ground fault handling device Download PDF

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Publication number
CN202276140U
CN202276140U CN201120393070XU CN201120393070U CN202276140U CN 202276140 U CN202276140 U CN 202276140U CN 201120393070X U CN201120393070X U CN 201120393070XU CN 201120393070 U CN201120393070 U CN 201120393070U CN 202276140 U CN202276140 U CN 202276140U
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CN
China
Prior art keywords
transformer
grounding transformer
ground fault
phase ground
bus
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Expired - Lifetime
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CN201120393070XU
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Chinese (zh)
Inventor
芮骏
洪新春
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Anhui electric technology Limited by Share Ltd
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ANHUI YITIAN ELECTRICAL TECHNOLOGY Co Ltd
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Priority to CN201120393070XU priority Critical patent/CN202276140U/en
Application granted granted Critical
Publication of CN202276140U publication Critical patent/CN202276140U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses an instantaneous single-phase ground fault handling device which comprises zero sequence current transformers (3) on branches (2), a voltage transformer (5) and a grounding transformer, wherein the voltage transformer (5) is in bridge connection between a bus (1) connected with the branches (2) and the ground. The zero sequence current transformers (3) and the secondary sides of the voltage transformer (5) are electrically connected with the input end of a controller (10); a silicon controlled rectifier (7) and a direct-current magnetic bias arc suppression coil (8) are connected between a neutral point of the grounding transformer and the ground; the control end of the coil (8) is electrically connected with the output end of the controller (10); particularly, the grounding transformer is a pulse type grounding transformer (6); a first fuse (4) and an isolation switch (11) are connected between the voltage transformer (5) and the bus (1) in series; and a second fuse (9) and the isolation switch (11) are connected between the pulse type grounding transformer (6) and the bus (1). The instantaneous single-phase ground fault handling device can be widely applied to a system of which a 3-66kV neutral point is not directly grounded.

Description

Instantaneity single phase ground fault processing unit
Technical field
The utility model relates to a kind of single phase ground fault processing unit, especially a kind of instantaneity single phase ground fault processing unit.
Background technology
Not in the solidly grounded system, it is modal a kind of fault that single phase ground fault takes place at the 3~66KV of China neutral point.When occurring the instantaneity unbalanced earth fault capacitance current greater than 10A in 10KV overhead transmission line or the 35KV cable line, people often adopt the grounding through arc device to compensate unbalanced earth fault capacitance current, and are just not widely used at present in the solidly grounded system like neutral point.This grounding through arc device is many to be made up of pulse current route selection parts and arc suppression coil compensation parts; Pulse current route selection parts wherein are mainly by the voltage transformer and the grounding transformer of cross-over connection between the zero sequence current mutual inductor of installing on the branch road, the bus that is connected with branch road and the ground; And controller is formed; Wherein, Be serially connected with controllable silicon between the neutral point of grounding transformer and the ground, the arc suppression coil compensation parts mainly are made up of the arc suppression coil that its control end is electrically connected with controller.In when, in the system single phase ground fault taking place when, declare the branch road of finding generation earth fault by pulse current route selection parts earlier and reach phase wherein, start arc suppression coil by controller again and devote oneself to work, utilize the inductive current of arc suppression coil to compensate unbalanced earth fault capacitance current.But; This grounding through arc device is based on neutral point not during solidly grounded system generation single phase ground fault, and the relevant regulations of the safe operation of power system that the length of system can be supplied power two hours designed and makes according to the continuous two hours long-term work time; Particularly wherein grounding transformer; Cause the coil of grounding transformer all too bigger than normal, caused the use amount of raw material copper and iron more, make its manufacturing cost be difficult to reduce with volume unshakable in one's determination.
The utility model content
The technical problem that the utility model will solve is for overcoming shortcoming part of the prior art, provides a kind of volume of grounding transformer wherein little, raw material copper and the less instantaneity single phase ground fault processing unit of iron use amount.
For solving the technical problem of the utility model; The technical scheme that is adopted is: instantaneity single phase ground fault processing unit comprises the zero sequence current mutual inductor on the branch road; Be connected with the voltage transformer and the grounding transformer of cross-over connection between bus and the ground of branch road, wherein, the secondary side of zero sequence current mutual inductor, voltage transformer is electrically connected with the input of controller; Be serially connected with controllable silicon, D.C. magnetic biasing arc suppression coil between the neutral point of grounding transformer and the ground respectively; The control end of D.C. magnetic biasing arc suppression coil is electrically connected with the output of controller, particularly
Said grounding transformer is the pulsed grounding transformer.
As the further improvement of instantaneity single phase ground fault processing unit, be serially connected with first fuse and isolating switch between described voltage transformer and the bus; Be serially connected with second fuse and isolating switch between described pulsed grounding transformer and the bus; Described controller is a microcomputer, or single-chip microcomputer, or digital signal processor.
Beneficial effect with respect to prior art is, is employed in zero sequence current mutual inductor is set on the branch road, is connected with that cross-over connection has voltage transformer and grounding transformer between bus and the ground of branch road; Wherein, The secondary side of zero sequence current mutual inductor, voltage transformer is electrically connected with the input of controller, is serially connected with controllable silicon, D.C. magnetic biasing arc suppression coil between the neutral point of grounding transformer and the ground respectively, on the control end of D.C. magnetic biasing arc suppression coil and the basis that the output of controller is electrically connected; Re-use the technical scheme that grounding transformer is the pulsed grounding transformer; Both satisfied the service requirement of system, when the instantaneity single phase ground fault took place, the pulsed grounding transformer can provide an instantaneous inductive current path for the D.C. magnetic biasing arc suppression coil again; Also to the instantaneity single phase ground fault characteristics---grounding transformer is in instantaneous operating state or no-load running state always; Break through the working method of traditional grounding transformer, adopted the working method of pulsed, the grounding transformer by long-term work in two hours of prior art is changed over the pulsed grounding transformer; Its volume is greatly reduced; Save great deal of raw materials copper and iron, greatly reduced manufacturing cost, obtained good economic and social benefit.
Further embodiment as beneficial effect; The one, preferably be serially connected with first fuse and isolating switch between voltage transformer and the bus; Preferably be serially connected with second fuse and isolating switch between pulsed grounding transformer and the bus, all be beneficial to voltage transformer, pulsed grounding transformer effectively protected and be convenient to it is carried out regular maintenance; The 2nd, controller is preferably microcomputer, or single-chip microcomputer, or digital signal processor, except that being easy to programming, also has versatility, characteristics that user interface is good.
Description of drawings
Be described in further detail below in conjunction with the optimal way of accompanying drawing the utility model.
Fig. 1 is a kind of basic structure sketch map of the utility model.
Embodiment
Referring to Fig. 1, being constructed as follows of instantaneity single phase ground fault processing unit: with all be equipped with zero sequence current mutual inductor 3 on every branch road 2 that bus 1 is electrically connected, the secondary side of zero sequence current mutual inductor 3 is electrically connected with the input of controller 10.Be connected with and be serially connected with isolating switch 11, second fuse 9, pulsed grounding transformer 6 and controllable silicon 7 and D.C. magnetic biasing arc suppression coil 8 between bus 1 and the ground of branch road 2 successively; Wherein, The anode of controllable silicon 7 and negative electrode respectively with the neutral point of pulsed grounding transformer 6 be electrically connected; D.C. magnetic biasing arc suppression coil 8 is serially connected with between the neutral point and ground of pulsed grounding transformer 6, and the control end of the gate pole of controllable silicon 7, D.C. magnetic biasing arc suppression coil 8 all is electrically connected with the output of controller 10.Going back cross-over connection between the contact of the isolating switch 11 and second fuse 9 and the ground has first fuse 4 and voltage transformer 5, and wherein, the secondary side of voltage transformer 5 is electrically connected with the input of controller 10.Controller 10 is a single-chip microcomputer.
When this device normally moved in electric power system, the pulsed grounding transformer 6 in the device was in the no-load running mode, and its neutral point voltage is zero or is a very little value that D.C. magnetic biasing arc suppression coil 8 is failure to actuate with controllable silicon 7.When the single phase ground fault of system's generation instantaneity; The neutral point voltage of pulsed grounding transformer 6 raises and is phase voltage; The residual voltage that the voltage transformer 5 of this moment will export a bigger generation single phase ground fault is sent to controller 10, by controller 10 triggering controllable silicons 7 conductings rapidly, neutral point not solidly grounded system instantaneity become solidly earthed neutral system; Between fault branch and neutral point, formed a controlled pulse current; Make device accomplish route selection apace, and start 8 work of D.C. magnetic biasing arc suppression coil simultaneously, make pulsed grounding transformer 6 that the path of the inductive current of an instantaneity is provided for D.C. magnetic biasing arc suppression coil 8 by controller 10; With inductive current compensation of ground capacitance current, make system restoration normal.In the process of handling the instantaneity single phase ground fault, pulsed grounding transformer 6 is in instantaneous operating state or no-load running state always.
Obviously, those skilled in the art can carry out various changes and modification to the instantaneity single phase ground fault processing unit of the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.

Claims (4)

1. instantaneity single phase ground fault processing unit; Comprise the zero sequence current mutual inductor (3) on the branch road (2); Be connected with the voltage transformer (5) and the grounding transformer of cross-over connection between bus (1) and the ground of branch road (2); Wherein, the secondary side of zero sequence current mutual inductor (3), voltage transformer (5) is electrically connected with the input of controller (10), is serially connected with controllable silicon (7), D.C. magnetic biasing arc suppression coil (8) between the neutral point of grounding transformer and the ground respectively; The control end of D.C. magnetic biasing arc suppression coil (8) is electrically connected with the output of controller (10), it is characterized in that:
Said grounding transformer is pulsed grounding transformer (6).
2. instantaneity single phase ground fault processing unit according to claim 1 is characterized in that being serially connected with between voltage transformer (5) and the bus (1) first fuse (4) and isolating switch (11).
3. instantaneity single phase ground fault processing unit according to claim 1 is characterized in that being serially connected with between pulsed grounding transformer (6) and the bus (1) second fuse (9) and isolating switch (11).
4. instantaneity single phase ground fault processing unit according to claim 1 is characterized in that controller (10) is a microcomputer, or single-chip microcomputer, or digital signal processor.
CN201120393070XU 2011-10-14 2011-10-14 Instantaneous single-phase ground fault handling device Expired - Lifetime CN202276140U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201120393070XU CN202276140U (en) 2011-10-14 2011-10-14 Instantaneous single-phase ground fault handling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201120393070XU CN202276140U (en) 2011-10-14 2011-10-14 Instantaneous single-phase ground fault handling device

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CN202276140U true CN202276140U (en) 2012-06-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050948A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Instant single-phase earth fault processing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050948A (en) * 2011-10-14 2013-04-17 安徽一天电气技术有限公司 Instant single-phase earth fault processing device

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C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: Yonghe Road, high tech Development Zone, Hefei city of Anhui Province, No. 99 230031

Patentee after: Anhui electric technology Limited by Share Ltd

Address before: Yonghe Road, high tech Development Zone, Hefei city of Anhui Province, No. 99 230031

Patentee before: Anhui Yitian Electrical Technology Co., Ltd.

CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20120613