CN2744038Y - Voltage limiting wire selector for low current grounding system - Google Patents
Voltage limiting wire selector for low current grounding system Download PDFInfo
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- CN2744038Y CN2744038Y CN 200420016718 CN200420016718U CN2744038Y CN 2744038 Y CN2744038 Y CN 2744038Y CN 200420016718 CN200420016718 CN 200420016718 CN 200420016718 U CN200420016718 U CN 200420016718U CN 2744038 Y CN2744038 Y CN 2744038Y
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- triode thyristor
- bidirectional triode
- open contact
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Abstract
The utility model relates to a voltage limiting wire selector for low current grounding system apparatus, comprising a microcomputer controller KZQ, a voltage transformer PT and a zero sequence current transformer CT1-CTn. The utility model is characterized in that this apparatus also comprises four normally open contacts K1-K4 of high voltage alternating current contactor and a double-direction silicon control SCR, wherein, one end of the three normally open contacts K1-K3 is respectively connected with one phase of the three-phase three-way system, and the other end of the three normally open contacts K1-K3 are connected in parallel. The double-direction silicon control SCR and the normally open contact K4 are respectively connected between the parallel end and the ground, and the control pole of the normally open contacts K1-K4 and the double-direction silicon control SCR is controlled by the microcomputer controller KZQ. The beneficial effect of the utility model is simple structure. The utility model eliminates the over voltage by changing the unstable single phase arc light grounding into the metallic direct grounding, exactly chooses the fault line and improves the supply power reliability of the electric network.
Description
Technical field
The utility model relates to a kind of small current neutral grounding system voltage limiting wire selector, is applicable to the high pressure station-service small current neutral grounding system in 3-35KV transformer station and power plant, and the former system that arc suppression coil is housed also can use.
Background technology
Chinese patent CN2387650Y discloses a kind of " Triphase Power Networks And Indirect Earthing System Overvoltage Debooster ", it includes microcomputerized controller, be connected to the voltage transformer pt on the bus, be connected to the zero sequence current mutual inductor CT1-CTn in each bar outlet, the input of the output termination microcomputer control device of voltage transformer pt, the input of the output termination microcomputer control device of zero sequence current mutual inductor CT1-CTn, it is characterized in that being provided with the high-voltage alternating contactor, the switch contact open in usual of the described high-voltage alternating contactor of coupled in series respectively between each the phase bus of controlled three-phase three wire system and ground, described each switch contact are connected for this phase arc grounding and when overvoltage is arranged.The pressure limiting branch road that discharging gap and non-linear zinc oxide valve plate are connected in series and constitute is set simultaneously.The shortcoming of above-mentioned patent is when unidirectional ground connection is taken place in system, because contactor needs the time of 30-40ms to connect, therefore during this period of time earth point will bear bigger rush of current, secondly for detect whether ground connection disappears and when judging that ground path disconnects contactor earth point also will bear bigger rush of current.And after ground connection disconnects, direct current electric charge unnecessary on the sound electric capacity relatively will cause the moment magnetic saturation of winding by the winding discharge of instrument transformer, still can excite ferro resonance.
Summary of the invention
Direct ground connection is eliminated overvoltage thereby technical problem to be solved in the utility model provides a kind of metallicity that can make unsettled single-phase arc grounding change this phase into, and can accurately select faulty line, improve the small current neutral grounding system voltage limiting wire selector of the power supply reliability of electrical network.
The technical scheme that its technical problem that solves the utility model adopts:
The utility model includes microcomputerized controller KZQ, be connected to the voltage transformer pt on the bus, be connected to the zero sequence current mutual inductor CT1-CTn in each bar outlet, the input of the output termination microcomputerized controller KZQ of voltage transformer pt, the input of the output termination microcomputerized controller of zero sequence current mutual inductor CT1-CTn, it is characterized in that it also includes the normally open contact K1-K4 and the controllable silicon SCR of four high-voltage alternating contactors, wherein the end of three normally open contact K1-K3 respectively with three-phase three wire system in one be connected, their other end parallel connection is connected to the two-way and normally open contact K4 of bidirectional triode thyristor SCR respectively between this parallel connected end and ground; The control utmost point of normally open contact K1-K4 and bidirectional triode thyristor SCR is controlled by microcomputerized controller KZQ.Microcomputerized controller KZQ control normally open contact K1-K3 realizes mutual locking.
Can also be parallel with capacitor C 1 and inductance L 1 respectively at bidirectional triode thyristor SCR two ends.
Between bidirectional triode thyristor SCR and ground, can also be connected to the shunt circuit of forming by capacitor C 2 and inductance L 2.
The beneficial effects of the utility model are simple in structure, thereby and the direct ground connection of its metallicity that can make unsettled single-phase arc grounding change this phase into eliminate overvoltage, and can accurately select faulty line, improve the power supply reliability of electrical network.
Description of drawings
Fig. 1 is the circuit theory diagrams of embodiment 1 of the present utility model.
Fig. 2 is the circuit theory diagrams of embodiment 2 of the present utility model.
Fig. 3 is the circuit theory diagrams of embodiment 3 of the present utility model.
In Fig. 1-3, MOA1-MOA3 is a lightning arrester, and RD1-RD3 is a fuse, and G1-Gn is an isolating switch, and DL1-DLn is a circuit breaker.
Embodiment
Embodiment 1:
By embodiment shown in Figure 11 as can be known, it includes microcomputerized controller KZQ, be connected to the voltage transformer pt on the bus, be connected to the zero sequence current mutual inductor CT1-CTn in each bar outlet, the input of the output termination microcomputerized controller KZQ of voltage transformer pt, the input of the output termination microcomputerized controller of zero sequence current mutual inductor CT1-CTn, it is characterized in that it also includes the normally open contact K1-K4 and the bidirectional triode thyristor SCR of four high-voltage alternating contactors, wherein the end of three normally open contact K1-K3 respectively with three-phase three wire system in one be connected, their other end parallel connection is connected to bidirectional triode thyristor SCR and normally open contact K4 respectively between this parallel connected end and ground; The control utmost point of normally open contact K1-K4 and bidirectional triode thyristor SCR is controlled by microcomputerized controller KZQ.Microcomputerized controller KZQ control normally open contact K1-K3 realizes mutual locking.
The operation principle of embodiment 1 is as follows:
When system's generation single-phase earthing, the UA of microcomputerized controller KZQ by voltage transformer pt is collected, UB, UC, the variation of UO instantaneous value compares, judge the separate of fault phase, and send control signal, the normally open contact K of closed fault phase, trigger the full conducting of bidirectional triode thyristor SCR simultaneously, send the closed normally open contact K4 of instruction subsequently, make the direct ground connection of bus of fault phase, after several seconds, microcomputerized controller KZQ sends signal, disconnect normally open contact K4 and reduce the angle of flow of bidirectional triode thyristor SCR gradually, the bus zero-sequence current that collects by zero sequence current mutual inductor CT1-CTn and the variation comparison of the zero-sequence current of each outlet, coming analysis and judgement is permanent earth or instantaneity ground connection, if permanent earth is then selected ground path; If instantaneity earth fault, the normally open contact K of open failure phase controls bidirectional triode thyristor SCR simultaneously and turn-offs, and system restoration normally moves.
Embodiment 2:
By embodiment shown in Figure 22 as can be known, it is parallel with capacitor C 1 and inductance L 1 respectively at bidirectional triode thyristor SCR two ends as different from Example 1.The effect of L1, C1 is filtering.
Embodiment 3
By embodiment shown in Figure 33 as can be known, it is connected to the shunt circuit of being made up of capacitor C 2 and inductance L 2 as different from Example 1 between bidirectional triode thyristor SCR and ground.The effect of L2, C2 is filtering.
In addition, in embodiment 1-3, bidirectional triode thyristor SCR also can replace with the controllable silicon of two reverse parallel connections.
Claims (3)
1, a kind of small current neutral grounding system voltage limiting wire selector, it includes microcomputerized controller KZQ, be connected to the voltage transformer pt on the bus, be connected to the zero sequence current mutual inductor CT1-CTn in each bar outlet, the input of the output termination microcomputerized controller KZQ of voltage transformer pt, the input of the output termination microcomputerized controller of zero sequence current mutual inductor CT1-CTn, it is characterized in that it also includes the normally open contact K1-K4 and the bidirectional triode thyristor SCR of four high-voltage alternating contactors, wherein the end of three normally open contact K1-K3 respectively with three-phase three wire system in one be connected, their other end parallel connection is connected to bidirectional triode thyristor SCR and normally open contact K4 respectively between this parallel connected end and ground; The control utmost point of normally open contact K1-K4 and bidirectional triode thyristor SCR is controlled by microcomputerized controller KZQ.
2, small current neutral grounding system voltage limiting wire selector according to claim 1 is characterized in that being parallel with capacitor C 1 and inductance L 1 respectively at bidirectional triode thyristor SCR two ends.
3, small current neutral grounding system voltage limiting wire selector according to claim 1 is characterized in that being connected to the shunt circuit of being made up of capacitor C 2 and inductance L 2 between bidirectional triode thyristor SCR and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420016718 CN2744038Y (en) | 2004-09-01 | 2004-09-01 | Voltage limiting wire selector for low current grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420016718 CN2744038Y (en) | 2004-09-01 | 2004-09-01 | Voltage limiting wire selector for low current grounding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2744038Y true CN2744038Y (en) | 2005-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420016718 Expired - Fee Related CN2744038Y (en) | 2004-09-01 | 2004-09-01 | Voltage limiting wire selector for low current grounding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2744038Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678260A (en) * | 2015-03-25 | 2015-06-03 | 南京南瑞继保电气有限公司 | System and method for single-phase grounding line selection of small current grounding system |
| CN106877305A (en) * | 2017-03-07 | 2017-06-20 | 河北旭辉电气股份有限公司 | New arc suppression coil earthing compensation device with grounding shunt function |
-
2004
- 2004-09-01 CN CN 200420016718 patent/CN2744038Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678260A (en) * | 2015-03-25 | 2015-06-03 | 南京南瑞继保电气有限公司 | System and method for single-phase grounding line selection of small current grounding system |
| CN106877305A (en) * | 2017-03-07 | 2017-06-20 | 河北旭辉电气股份有限公司 | New arc suppression coil earthing compensation device with grounding shunt function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051130 Termination date: 20091009 |