CN1295254A - Single-phase earthing-fault display method and instrument for power supply line - Google Patents
Single-phase earthing-fault display method and instrument for power supply line Download PDFInfo
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- CN1295254A CN1295254A CN 99122276 CN99122276A CN1295254A CN 1295254 A CN1295254 A CN 1295254A CN 99122276 CN99122276 CN 99122276 CN 99122276 A CN99122276 A CN 99122276A CN 1295254 A CN1295254 A CN 1295254A
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Abstract
The present invention features that one sample sensor set in the line samples the first current halt wave and the first voltage half wave in the instant of earthing through a capacitor and the phases are compared. When the first current half wave and the first voltage half wave are in-phase and the capacitor current changes abruptly with value greater than certain value, the line is proved to be earthed, and or else to be unearthed. A display instrument is also provided. In case of line earthing, the earthed branch and line segment may be displayed so that the fault point may be found fast.
Description
The present invention relates to a kind of earth fault display packing, particularly transmission line of electricity small connect ground system earth fault display method; The invention still further relates to the used instrument of a kind of this method.
Now 6kv, 10kv, 35kv isolated neutral or have line single phase grounding failure to take place through arc suppression coil earthing system length influences the normal operation of electrical network, and 10kv system working line complexity, and branch is more, and it is very difficult to search fault after the generation ground connection.
Because behind the small connect ground system generation single-phase earthing, ground current is very little only to be several the peace to tens peaces, the not power supply of interrupt system, but because the existence of ground connection is arranged, phase-to-ground voltage raises, reliability of system operation is affected.The method of detection of ground faults roughly has two classes at present: but a class is route selection, and promptly transformer station can judge that road generation ground connection, but just can not differentiate specific to that road outlet branch; Another kind of is to take place not have a power failure after the ground connection, and hand-held instrument is being searched below the circuit branch and below the circuit.After at present single-phase earthing taking place, general just power failure immediately just can't be differentiated fault for this instrument, and the principle of this instrument is the residual voltage and the zero-sequence current of sensor wire, relatively judges mutually, just can not differentiate for the high-and low-voltage circuit of joint using.
The object of the present invention is to provide a kind of supply line that in a single day the method that singlephase earth fault can show rapidly takes place, and can be used to joint use the circuit of height line ball.
Another object of the present invention is to provide a kind of supply line that in a single day the instrument that singlephase earth fault can show rapidly takes place.
Above-mentioned purpose of the present invention is realized by following technical proposals.
A kind of supply line singlephase earth fault display packing, it is characterized in that: on all main lines of circuit, branch line, branch line, be equipped with sampling sensor, by sampling sensor sampling the ground connection first half-wave of capacitance current and the ground connection voltage head half-wave of moment of moment, compare its phase place, when the capacitance current sudden change of sampling ground connection moment and greater than certain numerical value, the first half-wave homophase of the voltage of its first half-wave and ground connection moment, then ground connection takes place in circuit, otherwise ground connection does not take place in circuit.
A kind of instrument that is used for the demonstration earth fault of claim 1 is characterized in that: this instrument is made up of than phase logic decision circuitry and signal indicating circuit capacitance current sample circuit, the positive and negative half-wave decision circuitry of capacitance current, lead voltage of electric field sample circuit, current/voltage.Wherein the positive and negative half-wave of the capacitance current of the sampling sensor in capacitance current sample circuit sampling ground connection moment send capacitance current positive and negative half-wave decision circuitry, the positive and negative half-wave decision circuitry of capacitance current will be according to the direction of first half-wave, send a high level at one of its two output terminal, the first half-wave of voltage of lead voltage of electric field sample circuit sampling ground connection moment is also sent a high level at one of its two output terminal, current/voltage will compare logic determines according to the high level output terminal that the positive and negative half-wave decision circuitry of capacitance current is sent the output terminal of high level and lead voltage of electric field sample circuit here than phase logic decision circuitry will send or not send a high level and feed signals indicating circuit at its output terminal, send the ground connection shows signal when the input end of signal indicating circuit is high level.
Except that above-mentioned essential features, in implementation process, also can replenish following technology contents:
Current sampling circuit is by current sensor, the positive and negative half-wave arbiter of Hi-pass filter and electric current is formed, its effect is the positive and negative half-wave of sampling ground connection moment capacitance current, current sensor can be one to be wound with the magnet ring of coil, this magnet ring is set in the top in institute survey line highway section, two termination Hi-pass filters of coil, when circuit generation earth fault, the immediate current sudden change, the coil two ends HF voltage of will inducting, this HF voltage direction with moment the mutation current direction relevant, through Hi-pass filter filtering 50 all low frequency part, the output of Hi-pass filter connects the positive and negative half-wave arbiter of electric current, the positive and negative half-wave arbiter of electric current will be exported a high level earlier at one of its two output terminal according to the induced potential direction, two input ends of the positive and negative half-wave decision circuitry of two output termination capacitance currents of the positive and negative half-wave arbiter of electric current.
The positive and negative half-wave decision circuitry of this capacitance current is to be a Sheffer stroke gate trigger, and model can be 4093 or 4011, and its two output terminal C, D connect current/voltage than phase logic decision circuitry;
Current/voltage is made up of two Sheffer stroke gate triggers than phase logic decision circuitry, its input end is C, D, Z1, Z2, and wherein C and Z1 are two input contacts of same trigger, and this trigger is output as M, D and Z2 are two input contacts of another trigger, and this trigger is output as N;
Lead voltage of electric field sample circuit is by diode D9, after the D10 series connection again with a resistance and connect, the contact of two diodes, it is the negative pole of the positive pole of D9 and D10 connects current sensor with lead magnet ring, promptly connect the power transmission line of surveying, the negative pole of diode D9 is just connecing power supply by diode D13, the negative pole of D9 is as output point output Z1 signal, the negative pole of D9 also meets a Sheffer stroke gate U2:C, Sheffer stroke gate U2:C exports as signal Z2 after with signal Z1 paraphase, Z1, Z2 connects current/voltage respectively than the Z1 in the phase logic decision circuitry, Z2 imports contact, current/voltage is than the output terminal M of two triggers of phase logic decision circuitry, N connects signal indicating circuit by an OR circuit, show earth fault, wherein, the positive pole of D10 connects the negative pole of power supply B1 and connects a copper sheet unsettled, and the effect of this copper sheet is that the earth is formed a capacitor C 6.
The invention has the advantages that: when circuit takes place can show ground connection branch and ground wire highway section after the ground connection, can find the trouble spot rapidly, enhance productivity greatly, improve the reliability of power supply, reduce labor intensity.
Foundation of the present invention is, electric current radio-frequency component on the general normal power supply circuit is very little, and when single-phase earthing takes place, the radio-frequency component that significant proportion is arranged in its ground current, this ground connection high-frequency current instantaneous direction is relevant with ground connection transient voltage direction, when detecting the HF voltage electric current that homophase is arranged in certain moment on certain circuit, and the high-frequency current sudden change is greater than certain numerical value, and can judge on this circuit has singlephase earth fault.
Below in conjunction with drawings and Examples the present invention is described in further detail:
Description of drawings:
Fig. 1 specifically uses exemplary plot on the line for display packing of the present invention;
Fig. 2 is the circuit block diagram of the used display instrument of display packing of the present invention;
Fig. 3 is the circuit diagram of the used display instrument of display packing of the present invention;
As seen from Figure 1, at O
1O
2On the H place earth fault takes place, at sensor G
1On the electric current and the voltage homophase that are flow through, and electric current and voltage inversion in the sensor that each circuit is thereafter installed are as the sensor G among the figure
2When sensor receives the signal of electric current and voltage homophase, and current break is greater than certain numerical value, on the display circuit of its instrument indication will be arranged by the differentiation of the instrument of circuit as shown in Figure 2, and sensor G
2To not have indication on the display circuit of instrument.So will at an easy rate earth fault line be found.
Fig. 2 is the circuit block diagram of the designed display instrument of display packing according to the present invention.This instrument is made up of than phase logic decision circuitry and signal indicating circuit capacitance current sample circuit, the positive and negative half-wave decision circuitry of capacitance current, lead voltage of electric field sample circuit, current/voltage.Wherein the positive and negative half-wave of the capacitance current of the sampling sensor in capacitance current sample circuit sampling ground connection moment send capacitance current positive and negative half-wave decision circuitry, the positive and negative half-wave decision circuitry of capacitance current will be according to the direction of first half-wave, send a high level at one of its two output terminal, the first half-wave of voltage of lead voltage of electric field sample circuit sampling ground connection moment is also sent a high level at one of its two output terminal, current/voltage will compare logic determines according to the high level output terminal that the positive and negative half-wave decision circuitry of capacitance current is sent the output terminal of high level and lead voltage of electric field sample circuit here than phase logic decision circuitry will send or not send a high level and feed signals indicating circuit at its output terminal, send the ground connection shows signal when the input end of signal indicating circuit is high level.Its physical circuit can be as shown in Figure 3.
Among Fig. 3, current sampling circuit is made up of current sensor, Hi-pass filter and direction of current arbiter, and its effect is the positive and negative half-wave of sampling ground connection moment capacitance current.Current sensor can be one to be wound with the magnet ring of coil, and this magnet ring is set in the top in institute survey line highway section, two termination Hi-pass filters of coil.When having electric current to flow through in the circuit, the coil two disconnected voltages of will inducting, this voltage direction is relevant with direction of current, through Hi-pass filter filtering low frequency part.The output of Hi-pass filter connects the direction of current arbiter, and the direction of current arbiter will be exported a high level in its output terminals A or B according to the induced potential direction.Two input end A, the B of the positive and negative half-wave decision circuitry 2 of two output termination capacitance currents of direction of current arbiter.
The positive and negative half-wave decision circuitry 2 of this capacitance current is to be a Sheffer stroke gate trigger, and model can be 4093 or 4011, and its output terminal C, D connect current/voltage than phase logic decision circuitry 3.When the A point was high level earlier, then exporting C was high level, and D is a low level; When the B point was high level earlier, then exporting D was high level, and C is a low level;
Current/voltage is made up of two Sheffer stroke gate Schmidt triggers than phase logic decision circuitry 3.Its input end is C, D, Z1, Z2, and wherein C and Z1 are two input contacts of same trigger, and this trigger is output as M.D and Z2 are two input contacts of another trigger, and this trigger is output as N.
When the C point is high level, and Z1 also is high level, and then exporting M is high level; As C is that high level and Z1 hysteresis also are high level, and then exporting M is low level; As Z1 is low level, and C is a high level, and then exporting M is low level.
When D is high level, and Z2 also is high level, and then exporting N is high level; As D is that high level and Z2 hysteresis also are high level, and then exporting N is low level; As Z2 is high level, and D is a low level, and then exporting N is low level.
Other is provided with a lead voltage of electric field sample circuit, this circuit be by after diode D9, the D10 series connection again with a resistance and connect, the contact of two diodes, it is the negative pole of the positive pole of D9 and D10 connects current sensor with lead magnet ring, promptly connect the power transmission line of surveying, the negative pole of diode D9 is just connecing power supply by diode D13, and the negative pole of D9 is as output point output Z1 signal, the negative pole of D9 also meets a Sheffer stroke gate U2:C, and Sheffer stroke gate U2:C exports as signal Z2 after with signal Z1 paraphase.Z1, Z2 connect current/voltage respectively than the Z1 in the phase logic decision circuitry, Z2 input contact.Current/voltage connects signal indicating circuit than output terminal M, the N of two triggers of phase logic decision circuitry by an OR circuit, shows earth fault.Wherein, the positive pole of D10 connects the negative pole of power supply B1 and connects copper sheet 6 unsettled, and the effect of this copper sheet is that the earth is formed a capacitor C 6.When the F point was positive half-wave voltage, Z1 was high level output, and Z2 then is low level output; When F point during for negative half-wave voltage, Z1 is low level output, and Z2 then exports for high level.
When voltage on the circuit was positive half-wave, capacitance current was that positive flow is crossed and capacitance current sudden change during greater than certain numerical value, then exports a high level from M; When voltage on the circuit during for negative half-wave, capacitance current is that reverse direction flow is crossed and capacitance current sudden change during greater than certain numerical value, then exports a high level from N; Otherwise M, N are low level.As long as there is one to be high level among M or the N, then signal indicating circuit promptly shows earth fault.
Claims (7)
1, a kind of supply line singlephase earth fault display packing, it is characterized in that: this method is to be equipped with sampling sensor on all main lines, branch line, branch line at circuit, by sampling sensor sampling the ground connection first half-wave of capacitance current and the ground connection voltage head half-wave of moment of moment, compare its phase place, when the capacitance current sudden change of sampling ground connection moment and greater than certain numerical value, the first half-wave homophase of the voltage of its first half-wave and ground connection moment, then ground connection takes place in circuit, otherwise ground connection does not take place in circuit.
2, a kind of instrument that is used for the demonstration earth fault of claim 1, it is characterized in that: this instrument is by the capacitance current sample circuit, the positive and negative half-wave decision circuitry of capacitance current, lead voltage of electric field sample circuit, current/voltage is formed than phase logic decision circuitry and signal indicating circuit, wherein the positive and negative half-wave of the capacitance current of the sampling sensor in capacitance current sample circuit sampling ground connection moment send capacitance current positive and negative half-wave decision circuitry, the positive and negative half-wave decision circuitry of capacitance current will be according to the direction of first half-wave, send a high level at one of its two output terminal, the first half-wave of voltage of lead voltage of electric field sample circuit sampling ground connection moment is also sent a high level at one of its two output terminal, current/voltage will compare logic determines according to the high level output terminal that the positive and negative half-wave decision circuitry of capacitance current is sent the output terminal of high level and lead voltage of electric field sample circuit here than phase logic decision circuitry will send or not send a high level and feed signals indicating circuit at its output terminal, send the ground connection shows signal when the input end of signal indicating circuit is high level.
3, instrument as the said demonstration earth fault of claim 2, it is characterized in that: current sampling circuit is by current sensor, the positive and negative half-wave arbiter of Hi-pass filter and electric current is formed, its effect is the positive and negative half-wave of sampling ground connection moment capacitance current, current sensor can be one to be wound with the magnet ring of coil, this magnet ring is set in the top in institute survey line highway section, two termination Hi-pass filters of coil, when circuit generation earth fault, the immediate current sudden change, the coil two ends HF voltage of will inducting, this HF voltage direction with moment the mutation current direction relevant, through Hi-pass filter filtering 50 all low frequency part, the output of Hi-pass filter connects the direction of current arbiter, the direction of current arbiter will be exported a high level earlier at its two output terminal according to the induced potential direction, two input ends of the positive and negative half-wave decision circuitry of two output termination capacitance currents of direction of current arbiter.
4, as the instrument of the said demonstration earth fault of claim 2, it is characterized in that: the positive and negative half-wave decision circuitry of this capacitance current is to be a Sheffer stroke gate trigger, model can be 4093 or 4011, and it has two output terminals, and this two output termination current/voltage is than phase logic decision circuitry.
5, as the instrument of the said demonstration earth fault of claim 2, it is characterized in that: current/voltage is made up of the Sheffer stroke gate trigger of two parallel connections than phase logic decision circuitry, its input end is [C], [D], [Z1], [Z2], wherein [C] is two input contacts of same trigger with [Z1], this trigger is output as [M], [D] and [Z2] are two input contacts of another trigger, and this trigger is output as [N].
6, as the instrument of the said demonstration earth fault of claim 2, it is characterized in that: signal indicating circuit is made up of delay circuit and acousto-optic or other indicators, this delay circuit adds rc-delay circuit by Sheffer stroke gate or trigger and forms, or is a delay counter.
7, instrument as the said demonstration earth fault of claim 2, it is characterized in that: lead voltage of electric field sample circuit is by diode [D9], after [D10] series connection again with a resistance and connect, the contact of two diodes, promptly the negative pole of the positive pole of [D9] and [D10] connects the magnet ring of current sensor with lead, promptly connect the power transmission line of surveying, the negative pole of diode [D9] is just connecing power supply by diode [D13], the negative pole of [D9] is exported [Z1] signal as an output point, the negative pole of [D9] also connects a Sheffer stroke gate [U2:C], Sheffer stroke gate [U2:C] is exported as signal [Z2] after with signal [Z1] paraphase, [Z1], [Z2] connects current/voltage respectively than [Z1] in the phase logic decision circuitry, [Z2] imports contact, current/voltage is than the output terminal [M] of two triggers of phase logic decision circuitry, [N] connects signal indicating circuit by an OR circuit, show earth fault, wherein, the positive pole of [D10] connects the negative pole of power supply [B1] and connects a copper sheet unsettled, and the effect of this copper sheet is that the earth is formed an electric capacity [C6].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99122276 CN1109249C (en) | 1999-11-08 | 1999-11-08 | Single-phase earthing-fault display method and instrument for power supply line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99122276 CN1109249C (en) | 1999-11-08 | 1999-11-08 | Single-phase earthing-fault display method and instrument for power supply line |
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| Publication Number | Publication Date |
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| CN1295254A true CN1295254A (en) | 2001-05-16 |
| CN1109249C CN1109249C (en) | 2003-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99122276 Expired - Fee Related CN1109249C (en) | 1999-11-08 | 1999-11-08 | Single-phase earthing-fault display method and instrument for power supply line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221664A (en) * | 2011-05-30 | 2011-10-19 | 北京豪锐达科技有限公司 | Grounding fault detection method of overhead high voltage circuit |
| CN102621451A (en) * | 2012-03-28 | 2012-08-01 | 北京水木源华电气有限公司 | Distribution line single-phase grounding fault detecting method and system based on instantaneous signal method |
-
1999
- 1999-11-08 CN CN 99122276 patent/CN1109249C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221664A (en) * | 2011-05-30 | 2011-10-19 | 北京豪锐达科技有限公司 | Grounding fault detection method of overhead high voltage circuit |
| CN102621451A (en) * | 2012-03-28 | 2012-08-01 | 北京水木源华电气有限公司 | Distribution line single-phase grounding fault detecting method and system based on instantaneous signal method |
| CN102621451B (en) * | 2012-03-28 | 2016-01-06 | 北京水木源华电气股份有限公司 | Based on the distribution circuit single-phase earth fault detection method of momentary signal method |
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| Publication number | Publication date |
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| CN1109249C (en) | 2003-05-21 |
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