CN203522165U - 20kV power distribution network neutral point grounding mode intelligent switching device - Google Patents
20kV power distribution network neutral point grounding mode intelligent switching device Download PDFInfo
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- CN203522165U CN203522165U CN201320688981.4U CN201320688981U CN203522165U CN 203522165 U CN203522165 U CN 203522165U CN 201320688981 U CN201320688981 U CN 201320688981U CN 203522165 U CN203522165 U CN 203522165U
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Abstract
The utility model designs a 20kV power distribution network neutral point grounding mode intelligent switching device for solving the technical problem that the insulation requirement cannot be satisfied by a part of devices or tripping will be caused by a transient fault with existing 20kV power distribution network neutral point grounding modes. The 20kV power distribution network neutral point grounding mode intelligent switching device of the utility model is characterized in that the 20kV power distribution network neutral point grounding mode intelligent switching device comprises a central processing module, an indicating lamp module, a data output module, a data storage module, a signal acquisition module, and a power source for supplying power to each module. The signal acquisition module is used to transmit acquired signals to the central processing module through an analog-to-digital converter. The indicating lamp module, the data output module and the data storage module are all in communication connection with the central processing module. The central processing module comprises a clock circuit and a switching value input circuit. According to the utility model, the voltage in the power grid is monitored, and the grounding mode is switched according to the fault type, so that grounding is performed by adopting an arc suppression coil when a transient fault occurs, and the grounding mode is switched to the small resistor ground mode when a permanent fault occurs.
Description
Technical field
The utility model relates to circuit control device technical field, especially a kind of 20kV neutral grounding in distribution power network device for intelligently switching.
Background technology
After power distribution network 20kV boosting and transformation, if neutral point adopts grounding through arc mode, when electrical network breaks down, a part of equipment cannot meet insulating requirements; If adopt low resistance grounding mode, once in power distribution network, there is the fault of earthing type, no matter transient fault or permanent fault, the circuit breaker at faulty line place must first be implemented trip operation one time, and power supply reliability is impacted.
Utility model content
The purpose of this utility model is to provide a kind of 20kV neutral grounding in distribution power network device for intelligently switching in order to solve above-mentioned the deficiencies in the prior art, voltage in electrical network is monitored, according to fault type, switch earthing mode, while realizing generation transient fault, adopt grounding through arc; While there is permanent fault, switch to low resistance grounding.
In order to achieve the above object, a kind of 20kV neutral grounding in distribution power network device for intelligently switching that the utility model is designed, it is characterized in that comprising central processing module, indicating lamp module, data outputting module, data memory module, signal acquisition module and be the power supply of each module for power supply, described signal acquisition module transfers to central processing module by the signal of collection after by analog to digital converter, described indicating lamp module, data outputting module is all connected with described central processing module communication with data memory module, described central processing module is provided with clock circuit and switching value input circuit, described switching value input circuit is controlled the switching of a circuit breaker, described signal acquisition module is provided with divider resistance, transformer, sampling resistor and external interface, the former limit of described divider resistance and transformer is connected, the described sampling resistor of secondary access of described transformer.The external perimysium reference secondary voltage signal of 100V utilizes divider resistance to carry out dividing potential drop by external interface, sampling resistor is for providing sampled signal to central processing module, it is transient fault or permanent fault that central processing module is analyzed judgement to signal, if permanent fault sends instruction by breaker closing.
The technical program is for being arranged on circuit as shown in Figure 1, in figure, 1 is 20KV bus, 2 is voltage transformer, 3 is grounding transformer, 4 is arc suppression coil, 5 is small resistor, 6 is the switching device shifter of the technical program, arc suppression coil 4 place branch road isolating switch QSN are closed when normal operation, when power distribution network generation instantaneity earth fault, by arc suppression coil 4, compensated, arc extinction earth fault disappears automatically, this switching device shifter 6 can be monitored the bus residual voltage variation characteristic that fault occurs to disappearance, thereby avoided occurring a situation that has fault to trip at once in low resistance grounding mode, to permanent earth fault, when earth fault continues to surpass after setting time, neutral grounding mode device for intelligently switching sends the instruction of closing branch breaker QFN, drops into small resistor 5 ground connection, now because earthing mode changes, earth current increases, circuit relay protection is moved in excision faulty line, after faulty line failure removal, through the time delay of adjusting, the technical program is sent the instruction of tripping branch breaker QFN, exits small resistor 5 ground connection.
As the further of said structure, improve and supplement, the utility model also comprises the combination in any of following additional technical feature or these features:
Described signal acquisition module is also provided with inductance, and described inductance is serially connected in the former limit of described transformer, realizes signals collecting quality better.
The sense value of described inductance is 1mH.
Described switching value input circuit is provided with optocoupler, switching value input circuit converts breaker closing, cut-off signal to central processing module manageable pulse signal through photoelectrical coupler, and play the effect of isolation strong and weak electricity signal, make output signal on input without impact, antijamming capability is strong, working stability.
In described switching value input circuit, be provided with electric capacity and filter resistance for forming low-pass first order filter, reduce the burr of signal.
Described central processing module comprises that model is the single-chip microcomputer of MSP430, and described single-chip microcomputer is provided with keyboard interface, has sampling precision high, and processing speed is fast, low in energy consumption, the advantage that cost is low.
A kind of 20kV neutral grounding in distribution power network device for intelligently switching that the utility model is designed, can monitor bus residual voltage signal, when electrical network generation permanent fault, by the fault signature of judgement bus residual voltage, by single-chip microcomputer, sent the instruction of switching resistance, realize and when there is transient fault, adopt grounding through arc, when there is permanent fault, switch to low resistance grounding, automation is switched, the deficiency existing while avoiding only adopting grounding through arc or low resistance grounding.
Accompanying drawing explanation
Fig. 1 is that the utility model is arranged on the schematic diagram on circuit;
Fig. 2 is structured flowchart of the present utility model;
Fig. 3 is the schematic diagram of the utility model signal acquisition module;
Fig. 4 is the circuit diagram of the utility model switching value input circuit.
Embodiment
Below by embodiment, the utility model will be further described by reference to the accompanying drawings.
As in Figure 2-4, a kind of 20kV neutral grounding in distribution power network device for intelligently switching that the present embodiment is described, comprise central processing module, indicating lamp module, data outputting module, data memory module, signal acquisition module and be the power supply of each module for power supply, described signal acquisition module transfers to central processing module by the signal of collection after by analog to digital converter, described indicating lamp module, data outputting module is all connected with described central processing module communication with data memory module, described central processing module is provided with clock circuit and switching value input circuit, described switching value input circuit is controlled the switching of a circuit breaker, described signal acquisition module is provided with the divider resistance of 72k Ω, transformer, sampling resistor and external interface, the former limit of described divider resistance and transformer is connected, the described sampling resistor of secondary access of described transformer.Described signal acquisition module is also provided with the inductance that sense value is 1mH, and described inductance is serially connected in the former limit of described transformer.Described central processing module comprises that model is the single-chip microcomputer of MSP430, and described single-chip microcomputer is provided with keyboard interface.
Indicating lamp module comprises trigger 74LS06A, optocoupler 4n25, direct current relay, A.C. contactor.By direct current relay, control closing/closing of contact, thereby make ac contactor contact close/close.When arc suppression coil place branch road isolating switch QSN is closed, indicator light 1 is bright; When parallel low resistance place branch breaker QFN is closed, indicator light 2 is bright; During PT broken string, indicator light 3 is bright.
Described switching value input circuit is provided with optocoupler and by optocoupler, signal is transferred to MSP430 single-chip microcomputer.No. 1 of MSP430 single-chip microcomputer to No. 4 I/O mouth is configured to switching value input port, and Yu Si road optocoupler is connected, and by the collection of 4 way switch amounts, realizes monitoring and the control of each diverter switch state of centering point earthing mode.As shown in Figure 4, switching value signal in switching value input circuit is inputted by IN port, capacitor C and resistance R form low-pass first order filter filter away high frequency noise, reduce the burr of signal, adopt optical coupling 4N25 type, realize the electrical isolation between on-the-spot switching value and MSP430 single-chip microcomputer, improve electric insulation and antijamming capability.
Claims (6)
1. a 20kV neutral grounding in distribution power network device for intelligently switching, it is characterized in that comprising central processing module, indicating lamp module, data outputting module, data memory module, signal acquisition module and be the power supply of each module for power supply, described signal acquisition module transfers to central processing module by the signal of collection after by analog to digital converter, described indicating lamp module, data outputting module is all connected with described central processing module communication with data memory module, described central processing module is provided with clock circuit and switching value input circuit, described switching value input circuit is controlled the switching of a circuit breaker, described signal acquisition module is provided with divider resistance, transformer, sampling resistor and external interface, the former limit of described divider resistance and transformer is connected, the described sampling resistor of secondary access of described transformer.
2. a kind of 20kV neutral grounding in distribution power network device for intelligently switching according to claim 1, is characterized in that described signal acquisition module is also provided with inductance, and described inductance is serially connected in the former limit of described transformer.
3. a kind of 20kV neutral grounding in distribution power network device for intelligently switching according to claim 2, is characterized in that the sense value of described inductance is 1mH.
4. a kind of 20kV neutral grounding in distribution power network device for intelligently switching according to claim 1, is characterized in that described switching value input circuit is provided with optocoupler.
5. a kind of 20kV neutral grounding in distribution power network device for intelligently switching according to claim 1, is provided with electric capacity and filter resistance for forming low-pass first order filter in the switching value input circuit described in it is characterized in that.
6. a kind of 20kV neutral grounding in distribution power network device for intelligently switching according to claim 1, is characterized in that described central processing module comprises that model is the single-chip microcomputer of MSP430, and described single-chip microcomputer is provided with keyboard interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320688981.4U CN203522165U (en) | 2013-11-04 | 2013-11-04 | 20kV power distribution network neutral point grounding mode intelligent switching device |
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| CN201320688981.4U CN203522165U (en) | 2013-11-04 | 2013-11-04 | 20kV power distribution network neutral point grounding mode intelligent switching device |
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| CN203522165U true CN203522165U (en) | 2014-04-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104077B (en) * | 2014-08-04 | 2017-03-08 | 南京工程学院 | 20kV neutral grounding in distribution power network method for handover control and device |
| CN107069663A (en) * | 2017-04-14 | 2017-08-18 | 思源电气股份有限公司 | Applied to the small resistor intelligent protection system in neutral flexible grounding mode |
| CN110148931A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
| CN111682533A (en) * | 2018-09-14 | 2020-09-18 | 广东电网有限责任公司 | Automatic switching method and device for grounding transformer |
-
2013
- 2013-11-04 CN CN201320688981.4U patent/CN203522165U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104077B (en) * | 2014-08-04 | 2017-03-08 | 南京工程学院 | 20kV neutral grounding in distribution power network method for handover control and device |
| CN107069663A (en) * | 2017-04-14 | 2017-08-18 | 思源电气股份有限公司 | Applied to the small resistor intelligent protection system in neutral flexible grounding mode |
| CN111682533A (en) * | 2018-09-14 | 2020-09-18 | 广东电网有限责任公司 | Automatic switching method and device for grounding transformer |
| CN111682533B (en) * | 2018-09-14 | 2022-01-18 | 广东电网有限责任公司 | Automatic switching method and device for grounding transformer |
| CN110148931A (en) * | 2019-06-05 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
| CN110148931B (en) * | 2019-06-05 | 2021-01-08 | 南方电网科学研究院有限责任公司 | Arc suppression coil parallel low-resistance grounding device and control method |
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