CN103941154A - Ungrounded system single-phase earth fault monitoring device and method - Google Patents
Ungrounded system single-phase earth fault monitoring device and method Download PDFInfo
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Abstract
The invention relates to an ungrounded system single-phase earth fault monitoring device and method, and belongs to the field of power system fault monitoring. The primary side of a single-phase voltage mutual inductor in the device is connected with any one and only one of a phase A, a phase B and a phase C through a primary side fuse, and the other end of the primary side is grounded; one end of a secondary side of the single-phase voltage mutual inductor is connected with one end of a parallel suppression resistor through a secondary side fuse, and the other end of the secondary side is connected with the other end of the parallel suppression resistor and grounded; an overvoltage relay is connected with the two ends of the parallel suppression resistor; a low-voltage relay is connected with the two ends of the parallel suppression resistor. The method includes the steps that firstly, the ungrounded system single-phase earth fault monitoring device is arranged, then a setting value of the overvoltage relay and a setting value of the low-voltage relay are set, and finally fault judgment is carried out. The device is simple in structure and low in cost. Voltage to earth of any phase is used for judgment, and judgment is not influenced by the magnitude of voltage and current and is not influenced by the unbalanced current of a zero-sequence current filter.
Description
Technical field
The present invention relates to a kind of isolated neutral system singlephase earth fault monitoring device and method, belong to the malfunction monitoring field of electric system.
Background technology
In electric system, having many distributions is isolated neutral system, there is singlephase earth fault in isolated neutral system time, because the electric current of trouble spot is very little, and line voltage between three-phase still keeps symmetrical, power supply on load does not affect, therefore, all allow in the ordinary course of things to continue operation 1～2 hour, and needn't trip immediately.But fault phase voltage-to-ground reduces when isolated neutral system generation singlephase earth fault, other two phase-to-ground voltage raises 1.73 times, for preventing that fault from further expanding, should send in time signal, so that operations staff takes measures.
Current existing isolated neutral system singlephase earth fault monitoring has two classes.
One class is that the residual voltage occurring on system busbar while utilizing isolated neutral system generation single-phase earthing is monitored, its schematic diagram as shown in Figure 1, the voltage transformer (VT) TV installing on system busbar is the voltage transformer (VT) of a three-phase five-limb, its secondary side open-delta reactive system residual voltage 3U0, over voltage relay KV0 two ends are connected to residual voltage 3U0.The method can be monitored out the system failure, but can only send the non-selectivity anticipating signal of system earth, can not judge generation Earth Phase, the voltage transformer (VT) of three-phase five-limb has the three-phase three winding voltage mutual inductors of 5 magnetic posts simultaneously, and required expense is high more than single-phase potential transformer.
Another kind of is that while utilizing isolated neutral system generation single-phase earthing, the zero-sequence current feature large compared with non-fault line on faulty line realizes; its schematic diagram as shown in Figure 2; monitor all outlet zero-sequence currents; although the method can be monitored the circuit that is out of order in theory; but owing to being subject to the impact of zero-sequence current filtrator out-of-balance current, in the time that the capacitance current capacitance current less or protected circuit of system is larger, cannot make accurate judgment.
Summary of the invention
The invention provides a kind of isolated neutral system singlephase earth fault monitoring device and method, less economical and be subject to zero-sequence current filtrator out-of-balance current and be subject to the deficiency of line capacitance current affects for overcoming prior art.
Technical scheme of the present invention is: a kind of isolated neutral system singlephase earth fault monitoring device, comprises single-phase potential transformer 1, primary side fuse 2, secondary side fuse 3, resistance 4, over voltage relay 5, the under-voltage replay 6 of suppressing in parallel; Wherein single-phase potential transformer 1 primary side is connected to arbitrary phase in mutually of A phase, B phase, C and is only connect a phase, other end ground connection by primary side fuse 2; Single-phase potential transformer 1 secondary side one end is connected to one end that suppresses resistance 4 in parallel by secondary side fuse 3, and the other end is connected to the other end ground connection of suppressing resistance 4 in parallel; Over voltage relay 5 is connected to resistance 4 two ends that suppress in parallel; Under-voltage replay 6 is connected to resistance 4 two ends that suppress in parallel.
The described Standard resistance range that suppresses resistance 4 in parallel is 35 ohm～250 ohm.
A kind of isolated neutral system monitoring single-phase earth fault, the concrete steps of described method are as follows:
A, arrange isolated neutral system singlephase earth fault monitoring device: single-phase potential transformer 1 primary side is connected to arbitrary phase in mutually of A phase, B phase, C and is only connect a phase, other end ground connection by primary side fuse 2; Single-phase potential transformer 1 secondary side one end is connected to one end that suppresses resistance 4 in parallel by secondary side fuse 3, and the other end is connected to the other end ground connection of suppressing resistance 4 in parallel; Over voltage relay 5 is connected to resistance 4 two ends that suppress in parallel; Under-voltage replay 6 is connected to resistance 4 two ends that suppress in parallel;
B, the setting valve of over voltage relay 5 and under-voltage replay 6 is set: the setting valve of over voltage relay 5 can be set to 1.5pu, and the setting valve of under-voltage replay 6 can be set to 0.5pu;
C, fault judgement:
In the time that parallel connection suppresses the voltage V=1.0pu at resistance 4 two ends, show that system is normal, over voltage relay 5 and under-voltage replay 6 are all failure to actuate;
In the time that parallel connection suppresses the voltage V=0 at resistance 4 two ends, show the single-phase potential transformer 1 phase singlephase earth fault that connects, over voltage relay 5 is failure to actuate, and under-voltage replay 6 moves;
In the time that parallel connection suppresses the voltage V=1.73pu at resistance 4 two ends, show except connect arbitrary phase singlephase earth fault in all the other two-phases phase, under-voltage replay 6 is failure to actuate, over voltage relay 5 moves.
The described voltage that suppresses resistance 4 two ends in parallel is proportional to the primary side voltage of single-phase potential transformer 1, and the voltage of experiencing of over voltage relay 5, under-voltage replay 6 is proportional to single-phase potential transformer 1 phase voltage that connects; Wherein the voltage of experiencing of over voltage relay 5, under-voltage replay 6 is the voltage that suppresses resistance 4 two ends in parallel.
When described over voltage relay 5 moves, its normal opened contact closure, the normal opened contact in monitoring device sends singlephase earth fault alerting signal.
When described under-voltage replay 6 moves, its normally closed contact closure, the normally closed contact in monitoring device sends singlephase earth fault alerting signal.
Principle of work of the present invention is:
1, first by single-phase potential transformer 1, primary side fuse 2, secondary side fuse 3, in parallelly suppress resistance 4, over voltage relay 5, under-voltage replay 6 each several parts to press Fig. 3 connection good.
2, primary side one end of single-phase potential transformer 1 is connected to A, B, the arbitrary phase bus of C, other end ground connection through primary side fuse 2; Single-phase potential transformer 1 secondary side one end is connected to one end that suppresses resistance 4 in parallel by secondary side fuse 3, and the other end is connected to the other end ground connection of suppressing resistance 4 in parallel; Over voltage relay 5 and under-voltage replay 6 are connected in parallel in the two ends that suppress resistance 4 in parallel.
3, the voltage at the two ends that suppress resistance 4 in parallel is proportional to the primary side voltage of single-phase potential transformer 1, is proportional to system busbar B phase (primary side of supposing single-phase potential transformer 1 is connected to B phase bus) voltage (ratio value of direct ratio depends on single-phase potential transformer 1 no-load voltage ratio).
What 4, over voltage relay 5 and under-voltage replay 6 were experienced is the both end voltage that suppresses resistance 4 in parallel, and this is experienced voltage and is proportional to system busbar B phase (primary side of supposing single-phase potential transformer 1 is connected to B phase bus) voltage (ratio value of direct ratio depends on single-phase potential transformer 1 no-load voltage ratio).
5, set the setting valve of over voltage relay 5 and under-voltage replay 6.The setting valve of over voltage relay 1KV can be set to 1.5pu(perunit value); The setting valve of under-voltage replay 2KV can be set to 0.5pu(perunit value).
6, in the time that system is normal, the voltage that suppresses resistance R two ends in parallel is B phase (primary side of supposing single-phase potential transformer 1 is connected to B phase bus) secondary side ratings, V=1.0pu(perunit value), do not exceed the setting valve 1.5pu(perunit value of over voltage relay 1KV), therefore over voltage relay 1KV is failure to actuate; Not lower than under-voltage replay 2KV setting valve 0.5pu(perunit value), therefore under-voltage replay 2KV is failure to actuate.
7, over voltage relay 1KV and under-voltage replay 2KV are all failure to actuate, and illustrative system is normal, and device does not signal.
8, in the time of system B phase singlephase earth fault (primary side of supposing single-phase potential transformer 1 is connected to B phase bus), the voltage that suppresses resistance R two ends in parallel is 0, V=0, lower than under-voltage replay 2KV setting valve 0.5pu(perunit value), therefore under-voltage replay 2KV action; Do not exceed the setting valve 1.5pu(perunit value of over voltage relay 1KV), therefore over voltage relay 1KV is failure to actuate.
9, under-voltage replay 2KV action, its normally closed contact closure, as shown in Figure 4.Illustrating that single-phase potential transformer 1 connects there is singlephase earth fault mutually, and monitoring device just sends " system B phase single-phase earthing " failure alarm signal.
10, in the time of system A phase or C phase singlephase earth fault (primary side of supposing single-phase potential transformer 1 is connected to B phase bus), the voltage that suppresses resistance R two ends in parallel is 1.73 times of ratings, V=1.73pu(perunit value), exceed the setting valve 1.5pu(perunit value of over voltage relay 1KV), therefore over voltage relay 1KV action; Not lower than under-voltage replay 2KV setting valve 0.5pu(perunit value), therefore under-voltage replay 2KV is failure to actuate.
11, over voltage relay 1KV action, its normal opened contact closure, as shown in Figure 4.Illustrate in all the other two-phases and have one singlephase earth fault occurs mutually, monitoring device just sends " system A phase or C phase single-phase earthing " failure alarm signal.
The invention has the beneficial effects as follows: simple in structure, cost is lower; By utilizing arbitrary phase-to-ground voltage to judge, be not subject to the impact of system capacitive current size, be not subject to the impact of zero-sequence current filtrator out-of-balance current.
Brief description of the drawings
Fig. 1 monitors isolated neutral system generation singlephase earth fault schematic diagram with residual voltage in prior art;
Fig. 2 monitors isolated neutral system generation singlephase earth fault schematic diagram with zero-sequence current in prior art;
Fig. 3 is circuit theory diagrams of the present invention;
Fig. 4 is signal circuit figure of the present invention;
Each label in figure: 1 is that single-phase potential transformer, 2 is that primary side fuse, 3 is that secondary side fuse, 4 is that over voltage relay, 6 is under-voltage replay for parallel connection suppresses resistance, 5.
Embodiment
Embodiment 1: as Figure 1-4, a kind of isolated neutral system singlephase earth fault monitoring device, comprises single-phase potential transformer 1, primary side fuse 2, secondary side fuse 3, resistance 4, over voltage relay 5, the under-voltage replay 6 of suppressing in parallel; Wherein single-phase potential transformer 1 primary side is connected to arbitrary phase in mutually of A phase, B phase, C and is only connect a phase, other end ground connection by primary side fuse 2; Single-phase potential transformer 1 secondary side one end is connected to one end that suppresses resistance 4 in parallel by secondary side fuse 3, and the other end is connected to the other end ground connection of suppressing resistance 4 in parallel; Over voltage relay 5 is connected to resistance 4 two ends that suppress in parallel; Under-voltage replay 6 is connected to resistance 4 two ends that suppress in parallel.
The described Standard resistance range that suppresses resistance 4 in parallel is 35 ohm～250 ohm.
A kind of isolated neutral system monitoring single-phase earth fault, the concrete steps of described method are as follows:
A, arrange isolated neutral system singlephase earth fault monitoring device: single-phase potential transformer 1 primary side is connected to arbitrary phase in mutually of A phase, B phase, C and is only connect a phase, other end ground connection by primary side fuse 2; Single-phase potential transformer 1 secondary side one end is connected to one end that suppresses resistance 4 in parallel by secondary side fuse 3, and the other end is connected to the other end ground connection of suppressing resistance 4 in parallel; Over voltage relay 5 is connected to resistance 4 two ends that suppress in parallel; Under-voltage replay 6 is connected to resistance 4 two ends that suppress in parallel;
B, the setting valve of over voltage relay 5 and under-voltage replay 6 is set: the setting valve of over voltage relay 5 is set to 1.5pu, and the setting valve of under-voltage replay 6 can be set to 0.5pu;
C, fault judgement:
In the time that parallel connection suppresses the voltage V=1.0pu at resistance 4 two ends, show that system is normal, over voltage relay 5 and under-voltage replay 6 are all failure to actuate;
In the time that parallel connection suppresses the voltage V=0 at resistance 4 two ends, show the single-phase potential transformer 1 phase singlephase earth fault that connects, over voltage relay 5 is failure to actuate, and under-voltage replay 6 moves;
In the time that parallel connection suppresses the voltage V=1.73pu at resistance 4 two ends, show except connect arbitrary phase singlephase earth fault in all the other two-phases phase, under-voltage replay 6 is failure to actuate, over voltage relay 5 moves.
The described voltage that suppresses resistance 4 two ends in parallel is proportional to the primary side voltage of single-phase potential transformer 1, and the voltage of experiencing of over voltage relay 5, under-voltage replay 6 is proportional to single-phase potential transformer 1 phase voltage that connects; Wherein the voltage of experiencing of over voltage relay 5, under-voltage replay 6 is the voltage (ratio value of direct ratio depends on single-phase potential transformer 1 no-load voltage ratio) that suppresses resistance 4 two ends in parallel.
When described over voltage relay 5 moves, its normal opened contact closure, the normal opened contact in monitoring device sends singlephase earth fault alerting signal.
When described under-voltage replay 6 moves, its normally closed contact closure, the normally closed contact in monitoring device sends singlephase earth fault alerting signal.
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skill in the art, can also under the prerequisite that does not depart from aim of the present invention, make various variations.
Claims (6)
1. an isolated neutral system singlephase earth fault monitoring device, is characterized in that: comprise single-phase potential transformer (1), primary side fuse (2), secondary side fuse (3), resistance (4), over voltage relay (5), the under-voltage replay (6) of suppressing in parallel; Wherein single-phase potential transformer (1) primary side is connected to arbitrary phase in mutually of A phase, B phase, C and is only connect a phase, other end ground connection by primary side fuse (2); Single-phase potential transformer (1) secondary side one end is connected to one end that suppresses resistance (4) in parallel by secondary side fuse (3), and the other end is connected to the other end ground connection of suppressing resistance (4) in parallel; Over voltage relay (5) is connected to resistance (4) two ends that suppress in parallel; Under-voltage replay (6) is connected to resistance (4) two ends that suppress in parallel.
2. isolated neutral system singlephase earth fault monitoring device according to claim 1, is characterized in that: the described Standard resistance range that suppresses resistance (4) in parallel is 35 ohm～250 ohm.
3. an isolated neutral system monitoring single-phase earth fault, is characterized in that: the concrete steps of described method are as follows:
A, arrange isolated neutral system singlephase earth fault monitoring device: single-phase potential transformer (1) primary side is connected to arbitrary phase in mutually of A phase, B phase, C and is only connect a phase, other end ground connection by primary side fuse (2); Single-phase potential transformer (1) secondary side one end is connected to one end that suppresses resistance (4) in parallel by secondary side fuse (3), and the other end is connected to the other end ground connection of suppressing resistance (4) in parallel; Over voltage relay (5) is connected to resistance (4) two ends that suppress in parallel; Under-voltage replay (6) is connected to resistance (4) two ends that suppress in parallel;
B, the setting valve of over voltage relay (5) and under-voltage replay (6) is set: the setting valve of over voltage relay (5) can be set to 1.5pu, and the setting valve of under-voltage replay (6) can be set to 0.5pu;
C, fault judgement:
In the time that parallel connection suppresses the voltage V=1.0pu at resistance (4) two ends, show that system is normal, over voltage relay (5) and under-voltage replay (6) are all failure to actuate;
In the time that parallel connection suppresses the voltage V=0 at resistance (4) two ends, show single-phase potential transformer (1) the phase singlephase earth fault that connects, over voltage relay (5) is failure to actuate, under-voltage replay (6) action;
In the time that parallel connection suppresses the voltage V=1.73pu at resistance (4) two ends, show arbitrary phase singlephase earth fault in all the other two-phases except institute connects phase, under-voltage replay (6) is failure to actuate, and over voltage relay (5) moves.
4. isolated neutral system monitoring single-phase earth fault according to claim 3, it is characterized in that: the described voltage that suppresses resistance (4) two ends in parallel is proportional to the primary side voltage of single-phase potential transformer (1), and the voltage of experiencing of over voltage relay (5), under-voltage replay (6) is proportional to single-phase potential transformer (1) phase voltage that connects; Wherein the voltage of experiencing of over voltage relay (5), under-voltage replay (6) is the voltage that suppresses resistance (4) two ends in parallel.
5. isolated neutral system monitoring single-phase earth fault according to claim 3, is characterized in that: when described over voltage relay (5) action, and its normal opened contact closure, the normal opened contact in monitoring device sends singlephase earth fault alerting signal.
6. isolated neutral system monitoring single-phase earth fault according to claim 3, is characterized in that: when described under-voltage replay (6) action, and its normally closed contact closure, the normally closed contact in monitoring device sends singlephase earth fault alerting signal.
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| CN201410132287.3A CN103941154A (en) | 2014-04-03 | 2014-04-03 | Ungrounded system single-phase earth fault monitoring device and method |
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| CN201410132287.3A CN103941154A (en) | 2014-04-03 | 2014-04-03 | Ungrounded system single-phase earth fault monitoring device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155513A (en) * | 2014-07-24 | 2014-11-19 | 国网河南省电力公司平顶山供电公司 | Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer |
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|---|---|---|---|---|
| CN1096877A (en) * | 1993-06-22 | 1994-12-28 | 山东工业大学 | Universal small current grounding system single-phase grounding selecting and locating device |
| CN201797374U (en) * | 2010-08-31 | 2011-04-13 | 重庆市电力公司 | Intelligent protection device for neutral line fault and open phase |
| CN202351365U (en) * | 2011-12-08 | 2012-07-25 | 中国神华能源股份有限公司 | Small-current grounding alarm equipment and alarm system |
| CN202471888U (en) * | 2012-02-07 | 2012-10-03 | 杨程 | Online insulation fault analysis system device |
| CN202816637U (en) * | 2012-08-15 | 2013-03-20 | 山西省电力公司大同供电分公司 | Voltage transformer |
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2014
- 2014-04-03 CN CN201410132287.3A patent/CN103941154A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096877A (en) * | 1993-06-22 | 1994-12-28 | 山东工业大学 | Universal small current grounding system single-phase grounding selecting and locating device |
| CN201797374U (en) * | 2010-08-31 | 2011-04-13 | 重庆市电力公司 | Intelligent protection device for neutral line fault and open phase |
| CN202351365U (en) * | 2011-12-08 | 2012-07-25 | 中国神华能源股份有限公司 | Small-current grounding alarm equipment and alarm system |
| CN202471888U (en) * | 2012-02-07 | 2012-10-03 | 杨程 | Online insulation fault analysis system device |
| CN202816637U (en) * | 2012-08-15 | 2013-03-20 | 山西省电力公司大同供电分公司 | Voltage transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155513A (en) * | 2014-07-24 | 2014-11-19 | 国网河南省电力公司平顶山供电公司 | Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer |
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