CN205333704U - Double -phase asymmetric current source of adjustable type of resistance - Google Patents
Double -phase asymmetric current source of adjustable type of resistance Download PDFInfo
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- CN205333704U CN205333704U CN201620098375.0U CN201620098375U CN205333704U CN 205333704 U CN205333704 U CN 205333704U CN 201620098375 U CN201620098375 U CN 201620098375U CN 205333704 U CN205333704 U CN 205333704U
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Abstract
The utility model discloses a double -phase asymmetric current source, including secondary control part, electron PT, relay control box with exchange high -voltage vacuum contactors, electron PT secondary side inserts the input of secondary control part, and the electrical apparatus control box is succeeded to the output of secondary control part, relay control box control interchange high -voltage vacuum contactors's coil, it has two to exchange high -voltage vacuum contactors, and the opposite side is established ties and is connect high voltage diode and resistance formation, and in the resistance formation each resistance is parallelly connected resistance switch all, and electronics CT detects the electric current that flows past the high voltage diode, and electronics CT's secondary side inserts the input of on -off control part, the output termination second relay control box of on -off control part, opening and the closure of every resistance switch of second relay control box control. The device can automatically regulated characteristic electric current the size to the assurance can both make fault indicator luminescence indication fault line to earth fault at every turn.
Description
Technical field
This utility model relates to the field of fault detection of power system high-tension line single-phase earthing, in particular to a kind of asymmetric current source sending characteristic current can automatically to the fault detector on the high-tension line that singlephase earth fault occurs。
Background technology
At present, what the most of power distribution network of China adopted is neutral point not solidly grounded system, and distribution system branch is many and complicated, and during this kind of system generation singlephase earth fault, because fault current is less, fault signature is complicated so that the lookup of trouble point is extremely difficult；Finding out concrete abort situation and generally require consuming a large amount of human and material resources and time, breakdown judge commonly relies on the experience of people or the investigation of fault track walker, and overhaul of the equipments power failure operation time length, power failure range are bigger。Utility model patent 201220448758.8 discloses a kind of biphase asymmetric current source, including linear quadratic control part, electronics PT, relay operation case and AC high voltage vacuum contactor, electronics PT secondary side accesses the input of linear quadratic control part, the outfan contact relay control box of linear quadratic control part, relay operation case controls the coil of AC high voltage vacuum contactor, AC high voltage vacuum contactor has two, primary side connects the arbitrarily biphase of A, B, C three-phase respectively, opposite side series connection high-voltage diode and current-limiting resistance, another termination the earth of current-limiting resistance。If it occur that the singlephase earth fault of high-tension line, Earth Phase voltage-to-ground reduces, healthy phases voltage-to-ground raises, and biphase asymmetric current source can be that the fault detector on high-tension line is powered by forming closed-loop path, makes fault detector luminescence instruction fault route。But, different earth fault can make current source produce the characteristic current that varies in size, and characteristic current is too small and fault detector cannot be made luminous sometimes, thus fault route cannot be indicated。
Utility model content
The purpose of this utility model is to provide a kind of biphase asymmetric current source of resistance adjustable type, and this device can be automatically adjusted the size of characteristic current, thus ensureing each earth fault can make fault detector luminescence instruction faulty line。
For achieving the above object, this utility model takes techniques below scheme:
A kind of biphase asymmetric current source of resistance adjustable type, including linear quadratic control part, electronics PT, first relay operation case and AC high voltage vacuum contactor, electronics PT secondary side accesses the input of linear quadratic control part, the output of linear quadratic control part terminates the first relay operation case, first relay operation case controls the coil of AC high voltage vacuum contactor, AC high voltage vacuum contactor has two, it is characterized in that, the primary side of said two AC high voltage vacuum contactor connects A respectively, B, C three-phase arbitrarily biphase, opposite side series connection high-voltage diode and resistance queue, each resistance in resistance queue resistance switch all in parallel, the electric current of high-voltage diode is flow through in electronics CT detection, the secondary side of electronics CT accesses the input of switching control section, the output of switching control section terminates the second relay operation case, second relay operation case controls opening and Guan Bi of each resistance switch。
Preferably, in described resistance queue, the number of resistance is 3 ~ 10。
When there is singlephase earth fault in this utility model, corresponding A phase or B phase vacuum contactor close a floodgate, then electronics CT measures earth current, start all resistance switch all to disconnect, making resistance queue all access circuit, now earth current is minimum, if this electric current can not make fault detector luminous, then it is sequentially reduced the resistance of access, until electric current is close to higher limit。This current source, by changing resistance value, reduces the probability that fault detector can not be made because earth current is little luminous。
Accompanying drawing explanation
Fig. 1 is this utility model main circuit theory diagram。
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described further:
Biphase asymmetric current source as shown in Figure 1, electronics PT1,3,5 gather corresponding phase fault signal and send into input UA, UB, UC of linear quadratic control part。The outfan of linear quadratic control part controls the coil of two 10KV AC high voltage vacuum contactor K1 and K2 by the first relay operation case, two AC high voltage vacuum contactor K1 and K2 primary side connect the arbitrarily biphase of A, B, C three-phase respectively, such as meet A, B biphase, opposite side is together in series and connects high-voltage diode and resistance queue 12,3 ~ 10 resistance of general series connection in resistance queue 12, each resistor coupled in parallel one switch, when after switch connection, namely this resistance be shorted, and each switch is controlled the second relay operation case 13 by switching control section 11 and controls to open and Guan Bi。Being also associated with electronics CT10 on this circuit to detect earth current, the secondary side of electronics CT10 accesses the input of switching control section。
When the asymmetric current source of this resistance adjustable type works, when single-phase earthing being detected along with electronics PT, A or B phase vacuum contactor closes a floodgate, the earth current produced is detected by electronics CT10, starting whole resistance access circuits of resistance queue, switching control section 11 progressively closes switch according to the electronics CT10 earth current detected, and reduces the resistance number accessed, earth current is made constantly to increase, until electric current needed for reaching luminescence。If all after switch Guan Bi, earth current is still less than electric current needed for luminescence, it was shown that this kind of ground connection short time non-hazardous。During aforesaid operations, namely vacuum contactor contact once disconnects, and namely this process electronics CT measures an earth current, then one resistance switch of Guan Bi, then vacuum contactor carry out again closing, opening operation, electronics CT measures again, then a resistance switch is closed again, the like。
The explanation that this utility model is simply conceived and realized by the present embodiment, is not limited, and under this utility model is conceived, remains in protection domain without the technical scheme of essence conversion。
Claims (2)
1. the biphase asymmetric current source of resistance adjustable type, including linear quadratic control part, electronics PT, first relay operation case and AC high voltage vacuum contactor, electronics PT secondary side accesses the input of linear quadratic control part, the output of linear quadratic control part terminates the first relay operation case, first relay operation case controls the coil of AC high voltage vacuum contactor, AC high voltage vacuum contactor has two, it is characterized in that, the primary side of said two AC high voltage vacuum contactor connects A respectively, B, C three-phase arbitrarily biphase, opposite side series connection high-voltage diode and resistance queue, each resistance in resistance queue resistance switch all in parallel, the electric current of high-voltage diode is flow through in electronics CT detection, the secondary side of electronics CT accesses the input of switching control section, the output of switching control section terminates the second relay operation case, second relay operation case controls opening and Guan Bi of each resistance switch。
2. the biphase asymmetric current source of resistance adjustable type as claimed in claim 1, it is characterised in that in described resistance queue, the number of resistance is 3 ~ 10。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620098375.0U CN205333704U (en) | 2016-02-01 | 2016-02-01 | Double -phase asymmetric current source of adjustable type of resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620098375.0U CN205333704U (en) | 2016-02-01 | 2016-02-01 | Double -phase asymmetric current source of adjustable type of resistance |
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| Publication Number | Publication Date |
|---|---|
| CN205333704U true CN205333704U (en) | 2016-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620098375.0U Active CN205333704U (en) | 2016-02-01 | 2016-02-01 | Double -phase asymmetric current source of adjustable type of resistance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782439A (en) * | 2020-01-06 | 2021-05-11 | 保定钰鑫电气科技有限公司 | Manufacturing method of characteristic current for single-phase earth fault detection in small-current grounding system |
-
2016
- 2016-02-01 CN CN201620098375.0U patent/CN205333704U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782439A (en) * | 2020-01-06 | 2021-05-11 | 保定钰鑫电气科技有限公司 | Manufacturing method of characteristic current for single-phase earth fault detection in small-current grounding system |
| CN112782439B (en) * | 2020-01-06 | 2023-01-31 | 保定钰鑫电气科技有限公司 | Manufacturing method of characteristic current for single-phase earth fault detection in small-current grounding system |
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