CN202815149U - Two-phase unsymmetric current source - Google Patents
Two-phase unsymmetric current source Download PDFInfo
- Publication number
- CN202815149U CN202815149U CN201220448758.8U CN201220448758U CN202815149U CN 202815149 U CN202815149 U CN 202815149U CN 201220448758 U CN201220448758 U CN 201220448758U CN 202815149 U CN202815149 U CN 202815149U
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage vacuum
- current
- high voltage
- current source
- Prior art date
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Locating Faults (AREA)
Abstract
The utility model discloses a two-phase unsymmetric current source, comprising a secondary control portion, electronic PTs, a relay operation box, and AC high-voltage vacuum contactors. Secondary sides of the electronic PTs are connected with input ends of the secondary control portion. An output end of the secondary control portion is connected with the relay operation box. The relay operation box controls coils of the AC high-voltage vacuum contactors. The number of the AC high-voltage vacuum contactors is two. Primary sides of the two AC high-voltage vacuum contactors are respectively connected with any two phases of A-phase, B-phase, and C-phase, and the other sides are connected in series and are connected with a high-voltage diode D and a current-limiting resistor R. The other end of the current-limiting resistor R is connected with ground. The device can achieve a function of rapid and accurate positioning of fault points just using two AC high-voltage vacuum contactors, thereby greatly reducing production cost and saving resources.
Description
Technical field
The utility model relates to the 10KV line single phase grounding failure detection technique field of electric system, in particular to a kind of asymmetric current source that can automatically give the fault detector transmission characteristic current on the 10KV circuit that singlephase earth fault occurs.
Background technology
At present, what the most of power distribution networks of China adopted is not solidly grounded system of central point, and distribution system branch is many, and during this type systematic generation singlephase earth fault, it is less to hinder for some reason electric current and complicated, and fault signature is complicated, so that searching of trouble spot is very difficult; Finding out concrete abort situation often needs to expend a large amount of human and material resources and time, and the fault judgement generally depends on people's experience or fault track walker's investigation, and the overhaul of the equipments power failure running time is long, power failure range is larger.Chinese utility model patent 201020549446.7 discloses a kind of asymmetric current source, comprise linear quadratic control part, electronics PT, relay and AC high voltage vacuum contactor, electronics PT is by the input end of transmitter access linear quadratic control part, the output terminal of linear quadratic control part is succeeded electric apparatus coil, the coil of Control AC high voltage vacuum contactor, three AC high voltage vacuum contactor primary sides are connected with A, B, C three respectively, opposite side series connection D high-voltage diode and R current-limiting resistance, another termination the earth of R current-limiting resistance.This device sends characteristic current can automatically for the fault detector on the 10KV circuit that singlephase earth fault occurs, thereby quick and precisely locates the fault origination point, has saved a large amount of manpower and materials and investigation time.But, this asymmetric current source flows through the characteristics of the characteristic current of earth point when not taking full advantage of the high-pressure side single-phase earthing, three AC high voltage vacuum contactors that involve great expense have been adopted, each contactor also need be equipped with secondary device simultaneously, this is not only so that the whole manufacturing cost of this asymmetric current source is higher, and has produced complete unnecessary waste.
The utility model content
The purpose of this utility model provides the asymmetric current source of a kind of two-phase, and this device only needs to adopt two AC high voltage vacuum contactors, just can realize quick and precisely locating the function of trouble spot, has greatly reduced manufacturing cost, has saved resource.
For achieving the above object, the utility model is taked following technical scheme:
The asymmetric current source of a kind of two-phase, comprise the linear quadratic control part, electronics PT, relay operation case and AC high voltage vacuum contactor, the input end of electronics PT secondary side access linear quadratic control part, the output terminal of linear quadratic control part is succeeded the operation of electrical appliances case, the coil of relay operation case control AC high voltage vacuum contactor, described AC high voltage vacuum contactor has two, the primary side of these two AC high voltage vacuum contactors connects respectively A, B, any two-phase of C three-phase, opposite side series connection D high-voltage diode and R current-limiting resistance, another termination the earth of R current-limiting resistance.
When the utility model is implemented, controller is as core take linear quadratic control part technology, realize data sampling and processing, analysis, control inputs and output, the importation adopts electronics PT to carry out the voltage data collection of power distribution network central point isolated neutral system generation singlephase earth fault, sends into the input end of linear quadratic control part by transmitter.The output terminal of linear quadratic control part moves to control the AC high voltage vacuum contactor action by the pilot relay group, while is according to the characteristics of high-voltage one-phase ground connection, any two-phase of only having chosen A, B, C three-phase links to each other with AC high voltage vacuum contactor, thereby a delta connection by the electric system primary side that does not connect AC high voltage vacuum contactor still can form the closed-loop path and send characteristic current to fault detector, thereby carries out the quick and precisely location of trouble spot.
Present technique is applicable to the electrical power distribution system of isolated neutral.
Description of drawings
Fig. 1 is the main circuit theory diagram of the asymmetric current source of the utility model;
Fig. 2 is the operating circuit schematic diagram of the asymmetric current source of the utility model;
Fig. 3 is the installation wiring diagram of the asymmetric current source of the utility model;
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Such as the asymmetric current source of Fig. 1 two-phase shown in Figure 2, electronics PT1,3,5 gathers input end UA, UB, the UC that corresponding phase fault signal is sent into the linear quadratic control part.The output terminal of linear quadratic control part is by the coil of two 10KV AC high voltage vacuum contactor K1 of relay control box control and K2, two 10KV AC high voltage vacuum contactor K1 and K2 primary side connect respectively A, the B of 10KV, any two-phase of C three-phase, such as connect A, B two-phase (hereinafter all with meet A, the B two-phase illustrates as an example), opposite side is together in series and connects D high-voltage diode and R current-limiting resistance, another termination the earth of R current-limiting resistance.
When earth fault occurs in the somewhere on the circuit, the Earth Phase voltage-to-ground reduces, the healthy phases voltage-to-ground raises, the asymmetric current source linear quadratic control of two-phase is partly controlled a 10KV AC high voltage vacuum contactor action of healthy phases, action logic is as follows: suppose to select A, the join mode of connection of two 10KV AC high voltage vacuum contactors of B two, when then occuring, A phase ground connection closes the B phase, when occuring, B phase ground connection closes the A phase, close the A phase or close B when C phase ground connection occurs and all can mutually, make on the faulty line and to flow through pulsation characteristic of unidirectional electric current from power supply to earth point, on the faulty line dorsad the power supply direction then flow through without this characteristic current; Detect this characteristic current signal in conjunction with the fault detector of hanging on the line, namely pulse current sends wireless signal when fault detector detects the characteristic current signal, thereby this signal is received by repeater and is forwarded to the backstage.Thereby indicate outlet, branch and the section at earth fault place, when fault detector does not detect the characteristic current signal, illustrate that this circuit or this section are normal.
Select other two join two 10KV AC high voltage vacuum contactors also can, differentiate logic and analogize.
The signal that asymmetric current source produces does not affect the normal operation of transforming plant main transformer, ground connection change, arc suppression coil and circuit, when asymmetric current source normally moves in system and a circuit isolate fully.Because the signal that asymmetric current source produces is that low frequency is pure resistive, can also eliminate resonance simultaneously, over-voltage suppression reduces superpotential to the harm of system.Because asymmetric current source makes and flows through the current signal with obvious characteristic on the faulty line, after detecting this pulse current, extension fault detector on the line just can provide indicating fault, therefore this detection method is not subjected to the impact of system operation mode, topological structure, neutral grounding mode, and Detection accuracy is very high.
In conjunction with Fig. 3, triple cable connects respectively the 10KV circuit, and control cables connects respectively electronics PT1,3,5 secondary side UA, UB, UC and alternating current-direct current 220V working power, needs each section that an asymmetric current source all will be installed during the bus section operation.
Claims (1)
1. asymmetric current source of two-phase, comprise the linear quadratic control part, electronics PT, relay operation case and AC high voltage vacuum contactor, the input end of electronics PT secondary side access linear quadratic control part, the output terminal of linear quadratic control part is succeeded the operation of electrical appliances case, the coil of relay operation case control AC high voltage vacuum contactor, it is characterized in that, described AC high voltage vacuum contactor has two, the primary side of these two AC high voltage vacuum contactors connects respectively A, B, any two-phase of C three-phase, opposite side series connection D high-voltage diode and R current-limiting resistance, another termination the earth of R current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220448758.8U CN202815149U (en) | 2012-08-28 | 2012-08-28 | Two-phase unsymmetric current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220448758.8U CN202815149U (en) | 2012-08-28 | 2012-08-28 | Two-phase unsymmetric current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202815149U true CN202815149U (en) | 2013-03-20 |
Family
ID=47874007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220448758.8U Expired - Lifetime CN202815149U (en) | 2012-08-28 | 2012-08-28 | Two-phase unsymmetric current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202815149U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605039A (en) * | 2013-09-18 | 2014-02-26 | 国家电网公司 | Method used for detecting single-phase earth faults through current sequence signals |
| 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 |
| CN113945858A (en) * | 2021-02-02 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system convenient for processing single-phase grounding fault |
| WO2022121780A1 (en) | 2020-12-12 | 2022-06-16 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding of non-effectively grounded system |
-
2012
- 2012-08-28 CN CN201220448758.8U patent/CN202815149U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605039A (en) * | 2013-09-18 | 2014-02-26 | 国家电网公司 | Method used for detecting single-phase earth faults through current sequence signals |
| 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 |
| WO2022121780A1 (en) | 2020-12-12 | 2022-06-16 | 保定钰鑫电气科技有限公司 | Method for processing single-phase grounding of non-effectively grounded system |
| CN113945858A (en) * | 2021-02-02 | 2022-01-18 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system convenient for processing single-phase grounding fault |
| CN113945858B (en) * | 2021-02-02 | 2024-03-01 | 保定钰鑫电气科技有限公司 | Three-phase non-effective grounding power supply system convenient for processing single-phase grounding fault |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3460936B1 (en) | Pilot protection method for transmission line of new energy station based on current waveform similarity | |
| CN103018627B (en) | Adaptive fault type fault line detection method for non-effectively earthed system | |
| US10910826B2 (en) | Voltage derivative and zero-sequence broken conductor detection | |
| US11428726B2 (en) | Method and apparatus for detecting faults in a three-phase electrical distribution network | |
| CN103454555B (en) | Based on the one-phase earthing failure in electric distribution network Section Location of parameter identification | |
| CN104777397A (en) | Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion | |
| CN103280785B (en) | A kind of HVDC (High Voltage Direct Current) transmission line guard method of identifiable design high resistance earthing fault | |
| CN103245879A (en) | Small current neutral grounding fault location method based on direction of transient state reactive power | |
| CN110474307B (en) | Self-adaptive fault component current differential protection method based on current sag detection | |
| CN103199511B (en) | VSC-HVDC power transmission line pilot protection method based on model parameter identification | |
| CN203276027U (en) | Digital dynamic closed-loop test system of electricity smooth and steady supply device | |
| CN110880743B (en) | Kendel rank correlation-based pilot protection method for outgoing line of wind power plant | |
| CN104181441B (en) | One-phase earthing failure in electric distribution network Section Location based on model error | |
| CN202815149U (en) | Two-phase unsymmetric current source | |
| CN109507532A (en) | A kind of small current neutral grounding system Feeder Section Location | |
| CN102628914A (en) | Method for positioning grounding point of intelligent distribution line | |
| CN103344911B (en) | A kind of high-voltage direct-current switch disconnection overall process state identification method | |
| CN105262069A (en) | High-voltage DC line pilot protection method based on fault DC component | |
| CN201859161U (en) | Asymmetric current source | |
| CN202649381U (en) | GOOSE-based small-current grounding route selection system of intelligent transformer substation | |
| Ji et al. | A novel location method for single-phase grounding fault for distribution network based on transient technique | |
| Liu et al. | A novel pilot directional protection scheme for HVDC transmission line based on specific frequency current | |
| CN102082420B (en) | Longitudinal differential protection method of power transmission line | |
| CN111381127A (en) | Method and device for single-phase earth fault and insulation monitoring of mine power supply system | |
| CN103645419B (en) | The fault early warning system of wind energy turbine set power circuit and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130320 |