CN219833764U - Power grid fault metallic grounding transfer device - Google Patents
Power grid fault metallic grounding transfer device Download PDFInfo
- Publication number
- CN219833764U CN219833764U CN202223023907.9U CN202223023907U CN219833764U CN 219833764 U CN219833764 U CN 219833764U CN 202223023907 U CN202223023907 U CN 202223023907U CN 219833764 U CN219833764 U CN 219833764U
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- CN
- China
- Prior art keywords
- alternating current
- electrically connected
- current contactor
- power grid
- normally open
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002955 isolation Methods 0.000 claims description 23
- 238000010248 power generation Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a power grid fault metallic grounding transfer device which comprises a first alternating current contactor, a second alternating current contactor, a third alternating current contactor, a fourth alternating current contactor and a buffer resistor, wherein one end of a normally open contact of the first alternating current contactor, one end of a normally open contact of the second alternating current contactor and one end of a normally open contact of the third alternating current contactor are respectively and electrically connected with A, B, C of a power grid, the other end of the normally open contact of the first alternating current contactor, the other end of the normally open contact of the second alternating current contactor, the other end of the normally open contact of the third alternating current contactor and one end of the normally open contact of the fourth alternating current contactor are electrically connected with one end of the buffer resistor, and the other end of the fourth alternating current contactor is electrically connected with the other end of the buffer resistor; the buffer resistor is arranged, so that the current generated when the metal grounding transfer device is electrified is instantaneously reduced, and the damage to the element caused by overlarge current during electrification is prevented.
Description
Technical Field
The utility model relates to the technical field of power grid safety control devices, in particular to a power grid fault metallic grounding transfer device.
Background
The traditional metallic grounding transfer device such as an arc suppression cabinet, a focusing cabinet and the like is characterized in that three phase electricity of a substation bus ABC is led out to one end of three contactors in the cabinet by copper bars, the other ends of the three contactors are connected together by copper bars, the three contactors are connected to the copper bars in the substation, the three contactors play a role of switching, and the three contactors can be controlled by a controller to conduct switching-on and switching-off work.
The controller in the cabinet detects system voltage data, according to three-phase voltage change when single-phase earth faults occur, namely when faults occur, the phase voltage which occurs faults can be reduced, other non-fault phases can be raised to 3 times of the phase voltage, namely line voltage, so that the fault phase is selected, then the controller is used for controlling the switching-on conduction of a contactor connected with the fault phase to be grounded, fault current of the fault phase is transferred into the cabinet, and the safety of fault lines and systems is protected.
In the prior art, when the controller controls the switching-on conduction of the fault-connected contactor to be grounded, instant large current can be generated when the metallic grounding transfer device is electrified, and electrical elements of the metallic grounding transfer device can be damaged.
Disclosure of Invention
The utility model provides a power grid fault metallic grounding transfer device, aiming at solving the technical problems that in the prior art, when a controller controls a contactor connected with faults to be switched on and conducted to be grounded, instant large current is generated when a metallic grounding transfer device is electrified, and electrical elements of the metallic grounding transfer device are damaged.
The technical scheme for solving the technical problems is as follows:
the utility model provides a power grid fault metallic ground transfer device, includes first AC contactor, second AC contactor, third AC contactor, fourth AC contactor and snubber resistor, the one end of first AC contactor normally open contact with the A phase electricity of power grid is connected, the one end of second AC contactor normally open contact with the B phase electricity of power grid is connected, the one end of third AC contactor normally open contact with the C phase electricity of power grid is connected, the other end of first AC contactor normally open contact, the other end of second AC contactor normally open contact, the other end of third AC contactor normally open contact and the one end of fourth AC contactor normally open contact all with the one end electricity of snubber resistor, the other end of fourth AC contactor with the other end electricity of snubber resistor is connected, the other end ground connection of snubber resistor.
The utility model has the beneficial effects that through the arrangement of the buffer resistor, the current generated when the first alternating current contactor or the second alternating current contactor or the third alternating current contactor is connected is instantaneously reduced, and the damage to the element caused by overlarge current during power-on is prevented. Meanwhile, after the current is stable, the buffer resistor can be short-circuited through the fourth alternating current contactor, so that the fault current of a fault phase is transferred to metal grounding under the condition of grid faults.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the device also comprises a current transformer, wherein one end of the current transformer is electrically connected with the other end of the buffer resistor, and the other end of the current transformer is grounded.
The adoption of the further scheme has the beneficial effect that the large current in the alternating current circuit can be converted into small current with a certain proportion through the arrangement of the current transformer, so that the measuring and relay protection functions can be realized.
The power grid comprises a power grid body, a first alternating current contactor and a second alternating current contactor, wherein the power grid body is provided with a first alternating current contactor normally open contact, and the power grid body is provided with a first fuse, a second fuse and a third fuse; one end of the second fuse is electrically connected with the phase B of the power grid, and the other end of the second fuse is electrically connected with one end of the normally open contact of the second alternating current contactor; one end of the third fuse is electrically connected with the C phase of the power grid, and the other end of the third fuse is electrically connected with one end of a normally open contact of the third alternating current contactor.
The adoption of the further scheme has the beneficial effects that through the arrangement of the fuse, when the current exceeds a certain value, the fuse can generate heat to melt the melt, so that the current is disconnected, and the protection effect is achieved.
Further, the electric power generation device further comprises a first isolation disconnecting link, a second isolation disconnecting link and a third isolation disconnecting link, wherein one end of the first isolation disconnecting link is electrically connected with the phase A of the electric power grid, and the other end of the first isolation disconnecting link is electrically connected with one end of the first fuse; one end of the second isolation disconnecting link is electrically connected with the B phase of the power grid, and the other end of the second isolation disconnecting link is electrically connected with one end of the second fuse; one end of the third isolation disconnecting link is electrically connected with the C phase of the power grid, and the other end of the third isolation disconnecting link is electrically connected with one end of the third fuse.
The metal grounding circuit can be manually cut off under emergency by arranging the isolating knife switch.
Drawings
Fig. 1 is a schematic diagram of an electrical appliance of the present utility model.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
As shown in fig. 1, the present embodiment provides a power grid fault metallic grounding transfer device, which includes a first ac contactor ZKJ, a second ac contactor ZKJ, a third ac contactor ZKJ3, a fourth ac contactor ZKJ4, a snubber resistor HRC, a current transformer CT, a first fuse FU1, a second fuse FU2, a third fuse FU3, a first isolation knife switch QS1, a second isolation knife switch QS2, and a third isolation knife switch QS3; one end of the first isolation disconnecting link QS1 is electrically connected with the A phase of the power grid, and the other end of the first isolation disconnecting link QS1 is electrically connected with one end of the first fuse FU 1; one end of the second isolating switch QS2 is electrically connected with the B phase of the power grid, and the other end of the second isolating switch QS2 is electrically connected with one end of the second fuse FU 2; one end of the third isolating switch QS3 is electrically connected with the C phase of the power grid, and the other end of the third isolating switch QS3 is electrically connected with one end of the third fuse FU 3.
Specifically, the other end of the first fuse FU1 is electrically connected to one end of the normally open contact of the first ac contactor ZKJ1, and the other end of the second fuse FU2 is electrically connected to one end of the normally open contact of the second ac contactor ZKJ; the other end of the third fuse FU3 is electrically connected to one end of a normally open contact of the third ac contactor ZKJ.
The other end of the normally open contact of the first ac contactor ZKJ1, the other end of the normally open contact of the second ac contactor ZKJ2, the other end of the normally open contact of the third ac contactor ZKJ3, and one end of the normally open contact of the fourth ac contactor ZKJ4 are all electrically connected to one end of the snubber resistor HRC, the other end of the fourth ac contactor ZKJ4 is electrically connected to the other end of the snubber resistor HRC, and the other end of the snubber resistor HRC is grounded. One end of the current transformer CT is electrically connected with the other end of the buffer resistor HRC, and the other end of the current transformer CT is grounded.
The utility model has the beneficial effects that through the arrangement of the buffer resistor HRC, the instantaneous current generated when the first alternating current contactor ZKJ or the second alternating current contactor ZKJ or the third alternating current contactor ZKJ3 is connected is reduced, and the damage to the element caused by overlarge current during power-on is prevented. Meanwhile, after the current is stable, the buffer resistor HRC can be short-circuited through the fourth alternating current contactor ZKJ, so that the fault current of the fault phase is transferred to metal grounding under the power grid fault. The large current in the alternating current circuit can be converted into small current with a certain proportion by arranging the current transformer CT, so that the measuring and relay protection device is used for measuring and relay protection. Through setting up the fuse, when the electric current exceeded certain numerical value, the fuse can produce the heat and make its fuse-element melt to break off the electric current, reach the effect of protection. The metal grounding circuit can be manually cut off under emergency by arranging the isolating knife switch.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (4)
1. The utility model provides a electric wire netting trouble metallic ground transfer device which characterized in that: the power grid comprises a first alternating current contactor (ZKJ 1), a second alternating current contactor (ZKJ), a third alternating current contactor (ZKJ 3), a fourth alternating current contactor (ZKJ 4) and a buffer resistor (HRC), wherein one end of the normally open contact of the first alternating current contactor (ZKJ 1) is electrically connected with an A phase of the power grid, one end of the normally open contact of the second alternating current contactor (ZKJ) is electrically connected with a B phase of the power grid, one end of the normally open contact of the third alternating current contactor (ZKJ 3) is electrically connected with a C phase of the power grid, the other end of the normally open contact of the first alternating current contactor (ZKJ), the other end of the normally open contact of the second alternating current contactor (ZKJ 2), the other end of the normally open contact of the third alternating current contactor (ZKJ 3) and one end of the normally open contact of the fourth alternating current contactor (ZKJ) are electrically connected with one end of the buffer resistor (HRC), and the other end of the normally open contact of the fourth alternating current contactor (ZKJ) is electrically connected with the buffer resistor (HRC) and the other end of the buffer resistor (HRC) is electrically connected with the other end of the buffer resistor (HRC).
2. The power grid fault metallic ground transfer device of claim 1, wherein: the Current Transformer (CT) is electrically connected with the other end of the buffer resistor (HRC), and the other end of the Current Transformer (CT) is grounded.
3. The power grid fault metallic ground transfer device of claim 1, wherein: the power grid further comprises a first fuse (FU 1), a second fuse (FU 2) and a third fuse (FU 3), wherein one end of the first fuse (FU 1) is electrically connected with the A phase of the power grid, and the other end of the first fuse (FU 1) is electrically connected with one end of a normally open contact of the first alternating current contactor (ZKJ); one end of the second fuse (FU 2) is electrically connected with the B phase of the power grid, and the other end of the second fuse (FU 2) is electrically connected with one end of a normally open contact of the second alternating current contactor (ZKJ 2); one end of the third fuse (FU 3) is electrically connected with the C phase of the power grid, and the other end of the third fuse (FU 3) is electrically connected with one end of a normally open contact of the third alternating current contactor (ZKJ).
4. A grid fault metallic ground transfer device in accordance with claim 3, wherein: the electric power generation device further comprises a first isolation disconnecting link (QS 1), a second isolation disconnecting link (QS 2) and a third isolation disconnecting link (QS 3), wherein one end of the first isolation disconnecting link (QS 1) is electrically connected with A of the electric power grid, and the other end of the first isolation disconnecting link (QS 1) is electrically connected with one end of the first fuse (FU 1); one end of the second isolation disconnecting link (QS 2) is electrically connected with the B phase of the power grid, and the other end of the second isolation disconnecting link (QS 2) is electrically connected with one end of the second fuse (FU 2); one end of the third isolation disconnecting link (QS 3) is electrically connected with the C phase of the power grid, and the other end of the third isolation disconnecting link (QS 3) is electrically connected with one end of the third fuse (FU 3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223023907.9U CN219833764U (en) | 2022-11-14 | 2022-11-14 | Power grid fault metallic grounding transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223023907.9U CN219833764U (en) | 2022-11-14 | 2022-11-14 | Power grid fault metallic grounding transfer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219833764U true CN219833764U (en) | 2023-10-13 |
Family
ID=88245080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223023907.9U Active CN219833764U (en) | 2022-11-14 | 2022-11-14 | Power grid fault metallic grounding transfer device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219833764U (en) |
-
2022
- 2022-11-14 CN CN202223023907.9U patent/CN219833764U/en active Active
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