CN202276150U - Earth transfer current detection and compensation system - Google Patents
Earth transfer current detection and compensation system Download PDFInfo
- Publication number
- CN202276150U CN202276150U CN2011203931558U CN201120393155U CN202276150U CN 202276150 U CN202276150 U CN 202276150U CN 2011203931558 U CN2011203931558 U CN 2011203931558U CN 201120393155 U CN201120393155 U CN 201120393155U CN 202276150 U CN202276150 U CN 202276150U
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Abstract
The utility model discloses an earth transfer current detection and compensation system. A first current transformer (11) is connected in series between the moving contacts of a high-voltage switch (9) and an earth terminal (10), the input ends of a controller (7) are electrically connected with the output ends of a voltage transformer (2) and the first current transformer (11) and the control end of the high-voltage switch (9), the high-voltage switch (9) is connected in parallel with an arc suppression part, one end of an arc suppression coil (5) in the arc suppression part is electrically connected with the neutral point of an earthing transformer (3) through a second current transformer (4), the other end of the arc suppression coil (5) is electrically connected with the earth terminal (10), the secondary winding of the arc suppression coil (5) is electrically connected with the controller (7) through a programmable power supply (6), the controller (7) is electrically connected with the second current transformer (4), and when the high-voltage switch of the fault phase is closed, the first current transformer acquires the capacitive current value of the fault phase in order to start the arc suppression coil to generate compensating current. The earth transfer current detection and compensation system can be used in 3KV to 66KV isolated neutral systems.
Description
Technical field
The utility model relates to a kind of compensation arrangement, and especially a kind of ground connection transfer current detects compensation arrangement.
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.For solving the harm that this fault causes, people often are employed in the arc-control device that cross-over connection between bus and the ground has high-voltage switch gear.This arc-control device is electrically connected with the output of controller by the control end of high-voltage switch gear, and the input of controller and the secondary side of voltage transformer are electrically connected to form.When single phase ground fault occurring in the system; Make its direct ground connection through closed fault phase high-voltage switch gear; So that the capacitance current of the system of fault point is transferred to the high-voltage switch gear place, the current reduction that makes the fault point is to minimum, reaches to extinguish arc light, prevent the purpose of blasting in the fault point.Like neutral point just widely used at present arc-control device in the solidly grounded system not.But this arc-control device exists weak point, at first, the high-voltage switch contact of fault phase when closure, very easily because of capacitance current excessive in the system pass through burn; Secondly, the ground connection that the voltage of non-fault phase also can the failover phase and raising causes the insulation of equipment in the system generally impaired.
The utility model content
The technical problem that the utility model will solve provides a kind of rational in infrastructure for overcoming weak point of the prior art, and the less ground connection transfer current of the electric current of the fault of flowing through phase high-voltage switch gear detects compensation arrangement.
For solving the technical problem of the utility model; The technical scheme that is adopted is: the ground connection transfer current detects compensation arrangement and comprises that the moving contact of high-voltage switch gear is electrically connected with earth terminal, control end is electrically connected with the output of controller; The input of controller is electrically connected with the secondary side of voltage transformer; Particularly
Be serially connected with the primary side of first current transformer between the moving contact of said high-voltage switch gear and the earth terminal, the secondary side of said first current transformer is electrically connected with the input of controller;
Said high-voltage switch gear is connected in parallel to the extinguishing arc parts; One end warp, second current transformer of the primary winding of the arc suppression coil of said extinguishing arc parts is electrically connected with the neutral point that ground connection becomes, the other end is electrically connected with earth terminal; The secondary coil of arc suppression coil is electrically connected with the output of controller through programmable power supply, and the input of said controller is electrically connected with the secondary side of second current transformer;
Be used for earlier when the high-voltage switch gear of closed fault phase makes fault phase ground connection; Obtain the capacitance current value of fault phase by the secondary side of first current transformer; Restart arc suppression coil work; It is produced and the equal-sized offset current of fault capacitance current mutually, carry out full remuneration with capacitance current to single phase ground fault point.
Further improvement as ground connection transfer current detection compensation arrangement is serially connected with high voltage fuse between the fixed contact of described high-voltage switch gear and the HV Terminal; The primary side of described first current transformer is serially connected with between the public terminal and earth terminal of high-voltage switch gear.
Beneficial effect with respect to prior art is; One of which; The moving contact that device is employed in high-voltage switch gear is electrically connected with earth terminal, control end is electrically connected with the output of controller; On the input of controller and the basis that the secondary side of voltage transformer is electrically connected, between the moving contact of high-voltage switch gear and earth terminal, be serially connected with the primary side of first current transformer, and the secondary side of first current transformer is electrically connected with the input of controller; And high-voltage switch gear is connected in parallel to the extinguishing arc parts; One end warp, second current transformer of the primary winding of the arc suppression coil of these extinguishing arc parts is electrically connected with the neutral point that ground connection becomes, the other end is electrically connected with earth terminal, and the secondary coil of arc suppression coil is electrically connected with the output of controller through programmable power supply, the technical scheme that the input of controller is electrically connected with the secondary side of second current transformer; The capacitance current of both can be in the extremely short time measuring system exactly by the secondary side of first current transformer; And in time by the primary winding of the programmable power supply control arc suppression coil of controller in the extinguishing arc parts electric current that affords redress, thereby the capacitance current of the fault phase high-voltage switch contact of flowing through has been reduced widely, until trending towards zero; Stopped the burnout failure of fault phase high-voltage switch contact; The possibility that greatly reduced the voltage failover phase ground connection of non-fault phase again and raise has guaranteed that the insulation property of various device in the system avoid that voltage raises and the infringement that causes also has rational in infrastructure, reliable advantage.They are two years old; Detect the simple in structure of capacitance current in the device; The data of measuring for firm foundations have been established in follow-up compensation, are installed and have been realized the full remuneration to single phase ground fault point failure electric current simultaneously accurately and reliably; The capacitance current that makes the fault phase high-voltage switch contact of flowing through is residual near zero, when having solved system's generation single phase ground fault effectively to the adverse effect of system.
Further embodiment as beneficial effect; The one, preferably be serially connected with high voltage fuse between the fixed contact of high-voltage switch gear and the HV Terminal; Except that the contact of having guaranteed high-voltage switch gear can also can not reduce its manufacturing cost through the through-current capacity that suitably reduces high-voltage switch gear because of flowing through excessive capacitance current burns; Two is that the primary side of first current transformer preferably is serially connected with between the public terminal and earth terminal of high-voltage switch gear, under the situation of only using a current transformer, just can measure the capacitance current of the fault phase high-voltage switch gear of flowing through efficiently and accurately.
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; The ground connection transfer current detects being constructed as follows of compensation arrangement: be serially connected with the primary side, the control end that are serially connected with first current transformer 11 between high voltage fuse 8, moving contact and the earth terminal 10 between the fixed contact of high-voltage switch gear 9 and the HV Terminal 1 and be electrically connected with the output of controller 7; Wherein, The primary side of first current transformer 11 is serially connected with between the public terminal 12 and earth terminal 10 of high-voltage switch gear 9, and the secondary side of first current transformer 11 is electrically connected with the input of controller 7.
The input of controller 7 is electrically connected with the secondary side of voltage transformer 2.
High-voltage switch gear 9 is connected in parallel to the extinguishing arc parts; One end of the primary winding of the arc suppression coil 5 of these extinguishing arc parts through second current transformer 4 be electrically connected with the neutral point of ground connection change 3, the other end is electrically connected with earth terminal 10, the secondary coil of arc suppression coil 5 is electrically connected through the output of programmable power supply 6 with controller 7.The input of controller 7 is electrically connected with the secondary side of second current transformer 4.
During use, only need that respectively the primary side of HV Terminal 1, voltage transformer 2 and ground connection are become 3 primary side and be electrically connected with bus A, bus B and bus C, earth terminal 10 be electrically connected and get final product.When single phase ground fault took place in the system, this device detected the fault phase of generation single-phase earthing by controller 7 through voltage transformer 2, as B mutually after; The moving contact K2 of controller 7 control high-voltage switch gears 9 is closed; With the direct mutually ground connection of B, and, start programmable power supply 6 work with this by the capacitance current value that first current transformer, 11 places obtain the B phase; Arc suppression coil 5 is produced and the equal-sized offset current of B capacitance current mutually, come the capacitance current of B phase earth fault is compensated completely.
Obviously, those skilled in the art can detect that compensation arrangement carry out various changes and modification and the spirit and the scope that do not break away from the utility model to the ground connection transfer current 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 (3)
1. a ground connection transfer current detects compensation arrangement; The moving contact that comprises high-voltage switch gear (9) is electrically connected with earth terminal (10), control end is electrically connected with the output of controller (7); The input of controller (7) is electrically connected with the secondary side of voltage transformer (2), it is characterized in that:
Be serially connected with the primary side of first current transformer (11) between the moving contact of said high-voltage switch gear (9) and the earth terminal (10), the secondary side of said first current transformer (11) is electrically connected with the input of controller (7);
Said high-voltage switch gear (9) is connected in parallel to the extinguishing arc parts; One end warp second current transformer (4) of the primary winding of the arc suppression coil of said extinguishing arc parts (5) is electrically connected with the neutral point that ground connection becomes (3), the other end is electrically connected with earth terminal (10); The secondary coil of arc suppression coil (5) is electrically connected through the output of programmable power supply (6) with controller (7), and the input of said controller (7) is electrically connected with the secondary side of second current transformer (4);
Be used for earlier when the high-voltage switch gear (9) of closed fault phase makes fault phase ground connection; Obtain the capacitance current value of fault phase by the secondary side of first current transformer (11); Restart arc suppression coil (5) work; It is produced and the equal-sized offset current of fault capacitance current mutually, carry out full remuneration with capacitance current to single phase ground fault point.
2. ground connection transfer current according to claim 1 detects compensation arrangement, it is characterized in that being serially connected with high voltage fuse (8) between fixed contact and the HV Terminal (1) of high-voltage switch gear (9).
3. ground connection transfer current according to claim 1 detects compensation arrangement, it is characterized in that the primary side of first current transformer (11) is serially connected with between the public terminal (12) and earth terminal (10) of high-voltage switch gear (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203931558U CN202276150U (en) | 2011-10-14 | 2011-10-14 | Earth transfer current detection and compensation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203931558U CN202276150U (en) | 2011-10-14 | 2011-10-14 | Earth transfer current detection and compensation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202276150U true CN202276150U (en) | 2012-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203931558U Expired - Fee Related CN202276150U (en) | 2011-10-14 | 2011-10-14 | Earth transfer current detection and compensation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202276150U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050962A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Grounding transfer current detection compensation device and working method thereof |
-
2011
- 2011-10-14 CN CN2011203931558U patent/CN202276150U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050962A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Grounding transfer current detection compensation device and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120613 Termination date: 20151014 |
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| EXPY | Termination of patent right or utility model |