CN1388382A - One-phase earthing failure searching method and monitor - Google Patents
One-phase earthing failure searching method and monitor Download PDFInfo
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- CN1388382A CN1388382A CN 01118274 CN01118274A CN1388382A CN 1388382 A CN1388382 A CN 1388382A CN 01118274 CN01118274 CN 01118274 CN 01118274 A CN01118274 A CN 01118274A CN 1388382 A CN1388382 A CN 1388382A
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Abstract
The one-phase earthing catching method features that one DC power source with one end connected to ground via a resistor is connected to each of the triphase buses in power station, so one DC circuit is constituted by the DC power source, the resistor and the switch. Several monitors are set in the triphase power line, the variation in the voltage of each phase line to the ground is judged via triggering the switch to close and to produce one DC current in the failure phase line, and DC current drives the monitor to send indication signal. The present invention is superior in that stable DC is used to detect failure and this can avoid the effect of distribution capacitance and current fluctuation.
Description
The present invention relates to a kind of method and monitor of seeking earth fault, particularly a kind of method and monitor of seeking distribution line isolated neutral system singlephase earth fault.
Because distribution line adopts isolated neutral or the mode by grounding through arc mostly, when singlephase earth fault takes place when, the capacitance current of system is only flow through in the trouble spot, this electric current is generally less, does not influence system's powered operation, but causes the voltage-to-ground of earth-free phase to raise, threaten the safety of line insulation porcelain vase, porcelain insulator causes circuit breaker trip in case puncture will cause two relative ground circuits.For this reason, the problem that has some products to come out one after another and seek unidirectional earth fault position to solve.A kind of method is the signal source that installs an injection particular frequencies signal (as 220Hz) on the fault phase line additional, and this signal is got back to signal source through earth fault line, earth point through the earth, constitutes loop flow.Monitor the signal of this particular frequencies with hand-held current field signal monitoring device, seek the place that descends to the particular frequencies signal, be the position at earth fault place along faulty line.This method can only detect the very little fault of grounding resistance.Just limit the marking current intensity of injecting when the stake resistance resistance is big, makes it be difficult to be detected by the field signal monitoring device, success ratio is very low.And the signal source of the added different frequency of this method is interchange, and alternating current is subject to the influence of line distribution capacitance and current fluctuation, further the success ratio of influence monitoring.
The purpose of this invention is to provide a kind of method and monitor of monitoring the searching singlephase earth fault of distribution line isolated neutral system.This method and monitor can avoid line distribution capacitance and current fluctuation to the influence of monitoring, improve the success ratio of monitoring.
Above-mentioned purpose of the present invention is realized by following technical scheme.
A kind of method of seeking single-phase earthing, it is characterized in that: on the three-phase bus of transformer station, respectively connect a direct supply that is connected to switch, this other end that is connected to the direct supply of switch passes through resistance eutral grounding, the direct current active circuit that formation one is made up of direct supply, resistance and switch between each phase line and ground; Hang a plurality of monitors on three phase line, the variation that utilizes earth fault phase phase line-to-earth voltage produces a DC current as criterion trigger switch closure on the earth fault phase line, this direct current driven monitor action.
This method also can be replenished following technology contents in specific implementation process:
This switch DC power supply that is connected to that is connected on each three-phase bus is that the output terminal of any two-phase in the three-phase output winding of the three phase supply transformer of transformer station respectively connects a switch and commutation diode constitutes, utilize the variation of earth fault phase line-to-earth voltage to trigger the switch closure of non-fault wire as criterion, on the earth fault phase line, produce a DC current, this direct current driven monitor action.
This switch DC power supply that is connected to that is connected on each three-phase bus is to connect the three-phase grounding transformer that a Y shape connects on the three-phase bus of transformer station, connects a switch on the neutral line of this three-phase grounding transformer, and another termination diode in series of switch constitutes; In case generation earth fault, then the voltage of grounding transformer neutral point rises, rise as criterion trigger switch closure with this grounding transformer neutral point voltage, this phase ground connection Transformer Winding arrives diode in series and resistance and switch by earth fault phase line, trouble spot through the earth and forms the loop, in this loop, produce a direct current electric current, this direct current driven monitor action.
The resistance of the resistance of described and diode series connection is between Europe, 20 Europe-200.
The monitor that is used for the method for above-mentioned said searching singlephase earth fault provided by the present invention is realized by following technical scheme.
A kind of monitor that is used for the method for above-mentioned searching singlephase earth fault is characterized in that: be provided with magnet on the disk of a band rotating shaft, be fixed with magnetisable material on support, disk is provided with conductive contact, establishes another conductive contact on the support of fixed rotating shaft.
Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:
Set magnet is one on the disk of band rotating shaft, and is fixed in the center of disk, and the polarity of magnet is consistent with the radial direction of disk.
Set magnet is two on the disk of band rotating shaft, is fixedly arranged on respectively on the symmetric position of disk diameter, and the pole orientation of two magnet is opposite, and the direction of magnetic field of magnets and this disk is axial vertical.
Advantage of the present invention is:
When the resistance of earth fault is big, the voltage that is added in these resistance two ends is phase voltage, be generally 10KV, so to be added on the stake resistance its power inevitable very big for high voltage, its resistance value is descended its puncture, make the easy perception of monitor: or it is blown, stake resistance and fault thereof disappear, and circuit recovers normal operation.Owing to the direct current detection failure of stable state, can avoid the influence of line distribution capacitance and current fluctuation, make the easier perception of monitor.
The present invention is described in more detail below in conjunction with drawings and Examples:
Description of drawings:
Fig. 1 is one of electrical block diagram of the present invention.
Fig. 2 is two of an electrical block diagram of the present invention.
Fig. 3 is one of structural representation of monitor of the present invention.
Fig. 4 be monitor of the present invention structural representation two.
Fig. 5 is the schematic top plan view of monitor of the present invention, expression disk, magnet mutual alignment relation.
A kind of method of seeking singlephase earth fault provided by the present invention, be respectively to connect a direct supply that is connected to switch 1 on three-phase bus A, B, the C in transformer station, this other end that is connected to the direct supply of switch 1 passes through resistance 3 ground connection, the direct current active circuit that formation one is made up of direct supply, resistance and switch between each phase line and ground; Hang a plurality of monitors 13 on three phase line, the variation that utilizes earth fault phase phase line-to-earth voltage produces a DC current as criterion trigger switch 1 closure on the earth fault phase line, this direct current driven monitor action.
The method of searching singlephase earth fault shown in Figure 1 preferred embodiment in: this switch DC power supply that is connected to that is connected on each three-phase bus is that three-phase output winding A, the output terminal of any two-phase among B, the C in the three phase supply transformer T of transformer station respectively connects a switch 1 and commutation diode 2 constitutes, utilize the variation of earth fault phase phase line-to-earth voltage to trigger switch 1 closure of non-fault wire as criterion, on the earth fault phase line, produce a DC current, these direct current driven monitor 13 actions.As shown in the figure, when singlephase earth fault takes place in C mutually, the C phase-to-ground voltage descends, when transformer station detects C voltage relatively and descends, send the pass for the switch 1 that is connected in the B phase and close instruction, electric current is returned through the fault phase line by the earth, trouble spot through switch 1, diode 2, resistance 3 by B, the C phase coil of three-phase transformer T.The monitor that hangs on the C phase phase line detects this DC current, and the trigger pip show circuit sends signal.And do not have this DC current on the circuit below non-fault branch, non-fault phase line and the trouble spot, so the monitor of hanging thereon can not send indicator signal.Can find guilty culprit immediately according to this.
Fig. 2 is another preferred embodiment of the present invention, this switch DC power supply that is connected to that is connected on each three-phase bus is to meet the three-phase grounding transformer T1 that a Y shape connects on the three-phase bus of transformer station, connect a switch 1 on the neutral line of this three-phase grounding transformer T1, another termination diode in series 2 of switch 1 constitutes; In case generation earth fault, then the voltage of grounding transformer T1 neutral point rises, rise as criterion trigger switch 1 closure with this grounding transformer T1 neutral point voltage, this phase grounding transformer T1 winding arrives diode in series and resistance and switch by earth fault phase line, trouble spot through the earth and forms the loop, in this loop, produce a direct current electric current, this direct current driven monitor action.As shown in Figure 2, in when, earth fault not taking place, switch 1 is in the separating brake position, when singlephase earth fault takes place when, the neutral point voltage of grounding transformer T1 raises, send reclosing command for switch 1 as criterion, electric current is through the grounding transformer coil, faulty line, earth point flows back to resistance 3, diode 2 and switch 1 through the earth, form DC current path on the earth fault line between transformer station to the trouble spot, the monitor 13 that hangs over this faulty line detects DC current and sends indication immediately.And on the circuit below non-fault branch, non-fault phase line and the earth point, not having this DC current, 13 of the monitors of hanging thereon can not send indicator signal.
In above-mentioned two kinds of enforcements, switch closure, on faulty line, produce DC current, this DC current is superimposed upon on the load current, the monitor 13 that will have perception DC component function hangs over each bifurcation of distribution line, or segmentation hangs up a plurality of monitors 13 on a branchiess circuit, and a circuit is divided into several sections.When singlephase earth fault takes place when, the monitor of hanging on this circuit 13 is experienced DC current, will send indicator signal, the hunting workman seeks by this indicator signal, and in the end one is sent between signal and the previous monitor that does not send indication and can find earth fault.The resistance of the resistance of described and diode series connection is between Europe, 20 Europe-200.
Fig. 3, shown in Figure 4 be the structural representation of monitor, this monitor is to be provided with magnet 5 (as shown in Figure 3) on the disk 6 of a band rotating shaft 7, set magnet 5 is one, and is fixed in the center of disk, the polarity of magnet 5 is radially consistent with disk.Also can be that being shown in set on the disk of band rotating shaft as Fig. 4,5 is two magnet 10, these two blocks of magnet are fixedly arranged on respectively on the symmetric position at disk 6 diameter two ends, the pole orientation of two magnet 10 is opposite, and the direction of magnetic field of magnets is vertical with the diametric(al) of this disk 6.Be fixed with magnetisable material 11 on support 4, magnetisable material 11 plays holding magnet 5 or 10 balances.Disk 6 is provided with conductive contact 9, establishes another conductive contact 8 on the support 4 of fixed rotating shaft.
Monitor is mounted in the below of distribution line 12 shown in Fig. 3,4, when DC current is passed through, the generation magnetic field of DC current, original balance has been destroyed in this magnetic field, drive magnet 5 or 10 drives disk 6 and rotates, contact 9 on the disk 6 rotate and with contact 8 closures that are fixed on the support 4, trigger the indication loop and send indicator signal.
Claims (7)
1, a kind of method of seeking single-phase earthing, it is characterized in that: on the three-phase bus of transformer station, respectively connect a direct supply that is connected to switch, this other end that is connected to the direct supply of switch passes through resistance eutral grounding, the direct current active circuit that formation one is made up of direct supply, resistance and switch between each phase line and ground; Hang a plurality of monitors on three phase line, the variation that utilizes earth fault phase line-to-earth voltage produces a DC current as criterion trigger switch closure on the earth fault phase line, this direct current driven monitor action.
2, according to the method for the said searching singlephase earth fault of claim 1, it is characterized in that: this switch DC power supply that is connected to that is connected on each three-phase bus is that the output terminal of any two-phase in the three-phase output winding of the three phase supply transformer of transformer station respectively connects a switch and commutation diode constitutes, utilize the variation of earth fault phase line-to-earth voltage to trigger the switch closure of non-fault wire as criterion, on the earth fault phase line, produce a DC current, this direct current driven monitor action.
3, according to the method for the said searching singlephase earth fault of claim 1, it is characterized in that: this switch DC power supply that is connected to that is connected on each three-phase bus is to connect the three-phase grounding transformer that a Y shape connects on the three-phase bus of transformer station, connect a switch on the neutral line of this three-phase grounding transformer, another termination diode in series of switch constitutes; In case generation earth fault, then the voltage of grounding transformer neutral point rises, rise as criterion trigger switch closure with this grounding transformer neutral point voltage, this phase ground connection Transformer Winding arrives diode in series and resistance and switch by earth fault phase line, trouble spot through the earth and forms the loop, in this loop, produce a direct current electric current, this direct current driven monitor action.
4, according to the method for claim 1 or 2 said searching singlephase earth faults, it is characterized in that: the resistance of the resistance of described and diode series connection is between Europe, 20 Europe-200.
5, a kind of monitor that is used for the method for claim 1 or 2 or 3 said searching singlephase earth faults, it is characterized in that: on the disk of a band rotating shaft, be provided with magnet, be fixed with magnetisable material on support, disk is provided with conductive contact, establishes another conductive contact on the support of fixed rotating shaft.
6, according to the said monitor that is used to seek the method for singlephase earth fault of claim 5, it is characterized in that: set magnet is one on the disk of band rotating shaft, and is fixed in the center of disk, and the polarity of magnet is consistent with the radial direction of disk.
7, according to the said monitor that is used to seek the method for singlephase earth fault of claim 5, it is characterized in that: set magnet is two on the disk of band rotating shaft, be individually fixed on the symmetric position of disk diameter, the pole orientation of two magnet is opposite, and the direction of magnetic field of magnets and this disk is axial vertical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01118274 CN1388382A (en) | 2001-05-25 | 2001-05-25 | One-phase earthing failure searching method and monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01118274 CN1388382A (en) | 2001-05-25 | 2001-05-25 | One-phase earthing failure searching method and monitor |
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| CN1388382A true CN1388382A (en) | 2003-01-01 |
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| CN 01118274 Pending CN1388382A (en) | 2001-05-25 | 2001-05-25 | One-phase earthing failure searching method and monitor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334458C (en) * | 2005-06-02 | 2007-08-29 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN100348990C (en) * | 2005-05-09 | 2007-11-14 | 昆明理工大学 | Adaptive approach for route selection of grounded system connected to arc suppression coil |
| CN100367043C (en) * | 2004-06-03 | 2008-02-06 | 昆明理工大学 | Fault selecting method by attenuated DC component |
| CN102539854A (en) * | 2010-12-10 | 2012-07-04 | 上海蓝瑞电气有限公司 | Power grid signal injecting device for one-way earth fault location |
| CN102778636A (en) * | 2012-07-26 | 2012-11-14 | 北京飞举电气有限公司 | Single-phase ground fault location method and apparatus |
| CN113644634A (en) * | 2021-01-18 | 2021-11-12 | 保定钰鑫电气科技有限公司 | Interphase short circuit processing device |
-
2001
- 2001-05-25 CN CN 01118274 patent/CN1388382A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367043C (en) * | 2004-06-03 | 2008-02-06 | 昆明理工大学 | Fault selecting method by attenuated DC component |
| CN100348990C (en) * | 2005-05-09 | 2007-11-14 | 昆明理工大学 | Adaptive approach for route selection of grounded system connected to arc suppression coil |
| CN100334458C (en) * | 2005-06-02 | 2007-08-29 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN102539854A (en) * | 2010-12-10 | 2012-07-04 | 上海蓝瑞电气有限公司 | Power grid signal injecting device for one-way earth fault location |
| CN102778636A (en) * | 2012-07-26 | 2012-11-14 | 北京飞举电气有限公司 | Single-phase ground fault location method and apparatus |
| CN102778636B (en) * | 2012-07-26 | 2016-03-02 | 北京飞举电气有限公司 | Method for locating single-phase ground fault and equipment |
| CN113644634A (en) * | 2021-01-18 | 2021-11-12 | 保定钰鑫电气科技有限公司 | Interphase short circuit processing device |
| CN113644634B (en) * | 2021-01-18 | 2023-07-18 | 保定钰鑫电气科技有限公司 | Interphase short circuit treatment device |
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