CN202994956U - Device of searching grounding fault point of circuit - Google Patents

Device of searching grounding fault point of circuit Download PDF

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Publication number
CN202994956U
CN202994956U CN 201220361707 CN201220361707U CN202994956U CN 202994956 U CN202994956 U CN 202994956U CN 201220361707 CN201220361707 CN 201220361707 CN 201220361707 U CN201220361707 U CN 201220361707U CN 202994956 U CN202994956 U CN 202994956U
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China
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signal
unit
current
circuit
point
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CN 201220361707
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王汝钢
白海江
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Pite Tech Inc
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Pite Tech Inc
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Abstract

The utility model provides a device of searching a grounding fault point of a circuit. The device of searching the grounding fault point of the circuit comprises a signal transmitter and a signal receiver, wherein the signal receiver comprises a signal generating unit, a current detecting unit, an analyzing processing unit, a direction indicating unit and a reference point setting unit, and the signal generating unit, the current detecting unit, the direction indicating unit and the reference point setting unit are connected with the analyzing processing unit separately. According to the utility model, the signal receiver generates a reference voltage signal having a frequency same as that of a sending voltage signal to obtain the sending direction of a current signal in a to-be-tested circuit, so that the grounding fault point in the to-be-tested circuit can be positioned accurately and rapidly.

Description

Search the device of line-to-ground fault point
Technical field
The utility model relates to the wireline inspection field, more particularly, relates to a kind of device of searching line-to-ground fault point.
Background technology
When earth fault occurring in circuit, need to search, locate the trouble spot.Usually adopt following methods to search, locate the trouble spot: to exchange or the voltage signal of direct current to sending between circuit to be measured and ground by a sender unit, due to line-to-ground resistance and the existence of distributed capacitance over the ground, circuit to be measured can produce and search accordingly current signal, use simultaneously a signal receiver to search current signal along wireline inspection to be measured, the place that occurs cataclysm in the intensity of searching current signal or phase place is earth fault.
Be to flow out from the sender unit output terminal owing to searching current signal, the circuit to be measured of flowing through flows out from earth fault at last, flow back to sender unit by ground, if therefore signal receiver can be indicated and be searched sense of current, can along searching sense of current, find fast earth fault.By this mode, when searching the earth fault of complicated netted circuit, work efficiency can significantly improve.
At present, when searching line-to-ground fault point, the method for the detection of leaks current signal direction that usually adopts has following several:
(1) AC signal method: by the voltage signal (reference signal) of sender unit to the alternation of transmission lower frequency between circuit to be measured and ground, namely produce in circuit to be measured and search accordingly current signal, this frequency of searching current signal is identical with voltage signal (reference signal), but phase place difference to some extent.Sender unit is simultaneously also by wired, wireless or sent the modulated signal of the upper frequency after being modulated by reference signal and high-frequency signal to signal receiver by circuit to be measured self.Signal receiver detects along line trace to be checked and searches current signal, with receiving by wired, wireless or by circuit to be measured self, the modulated signal that reception is sent by sender unit after its demodulation is restored reference signal, compares with the phase place of the Leakage Current signal that detects.If phase differential is near 0 °, the signal receiver indicated direction is with to search the current signal direction identical; If phase differential is near 180 °, the signal receiver indicated direction with search the current signal opposite direction.
The shortcoming of the method is to need sender unit and signal receiver to intercom mutually by wired or wireless mode.When adopting wired mode to communicate, need special-purpose telecommunication cable to connect sender unit and signal receiver, and search in the earth fault point process, telecommunication cable moves around in tow, and is extremely inconvenient; When adopting communication, sender unit and signal receiver may be positioned at the different location, the centre has the barriers such as wall and intercepts mutually, radio communication is often interrupted, and because signal receiver is portable set, generally adopts powered battery, radio communication can cause the power consumption meeting significantly to increase, after battery was full of electricity, in use procedure, the electric weight of battery storage exhausted very soon, and the working time of equipment is very limited.Carrier signal is transmitted on road itself if survey line is looked in utilization, when having larger undesired signal on, circuit faint when Leakage Current, the carrier signal decay of upper frequency is very large, causes phase measurement error larger, be difficult to correctly indicate the Leakage Current direction, can't drop into practical application.
(2) direct current signaling: send d. c. voltage signal by sender unit to circuit to be measured and make circuit generation to be measured search accordingly current signal, then followed the tracks of to receive by signal receiver along circuit to be measured and search current signal.Direct current signal itself is directive, and signal receiver utilizes the directivity of direct current signal, thus the direction of indication Leakage Current.
The shortcoming of the method is: first, due to the zero point drift of acceptor circuit, be difficult to detect faint Leakage Current signal, during undesired signal that therefore on, circuit faint when Leakage Current, existence is larger, detect error larger, can't correctly indicate the direction of Leakage Current.The second, the method is only suitable in the not troubleshooting of charged working line, when the charged work of circuit, owing to itself working current being arranged on circuit, can't carry out troubleshooting.
(3) with the direct current signaling of zero compensation: the similar direct current signaling of the method, but sender unit produces low-frequency square-wave signal (searching signal), sender unit, signal receiver are by wired, wireless or communicated by circuit to be measured self mode, when square-wave signal low level (being no signal output), manually or automatically with signal receiver zero setting, when the square-wave signal high level, the detection of searching signal.
Although the method can be avoided the zero point drift of signal receiver circuit, but when having the undesired signal of complicated alternating current-direct current on circuit, can't eliminate the impact of undesired signal, thereby when having larger undesired signal on, circuit faint when Leakage Current, the method error is larger, can't correctly indicate the direction of searching current signal.In addition, the method also needs sender unit and signal receiver to intercom mutually by wired or wireless mode.When adopting wired mode to communicate, need special-purpose telecommunication cable to connect sender unit and signal receiver, and search in the earth fault point process, telecommunication cable moves around in tow, and is extremely inconvenient; When adopting communication, sender unit and signal receiver may be positioned at the different location, the centre has the barriers such as wall and intercepts mutually, radio communication can often be interrupted, and because signal receiver is portable set, generally adopts powered battery, radio communication can cause the power consumption meeting significantly to increase, after battery was full of electricity, in use procedure, the electric weight of battery storage can exhaust very soon, and the working time of equipment is very limited.If utilize and to be looked into survey line road itself and transmit carrier signal, when having larger undesired signal on, circuit faint when Leakage Current, the carrier signal decay of upper frequency is very large, can't drop into practical application.
In sum, can detect at present the method for searching earth fault and the device of searching direction of current, use extremely inconvenient, be not easy to indicate exactly the direction of searching current signal, especially for searching searching of the very faint high resistance earthing fault point of electric current, and the searching of the on-the-spot earth fault that has a stronger interference.
The utility model content
The technical problems to be solved in the utility model is, can't accurately indicate the problem of searching the current signal direction in searching for above-mentioned earth fault, and a kind of device of searching line-to-ground fault point is provided.
the technical scheme that the utility model solves the problems of the technologies described above is, a kind of device of searching line-to-ground fault point is provided, comprise sender unit and signal receiver, wherein said sender unit is used for applying to circuit to be measured the transmission voltage signal that frequency is f0 and sends current signal so that circuit to be measured produces, described signal receiver comprises for generation of a signal generating unit with the reference voltage signal of described transmission voltage signal same frequency, current detecting unit for detection of the transmission current signal in circuit to be measured, be used for described transmission current signal and reference voltage signal are carried out synchronized sampling, and calculate the transmission current signal with respect to the analysis and processing unit of the correction phase am ' of datum, be used for circuit to be measured according to described correction phase am ' indication and send the direction unit of direction of current signal and the reference point setting unit that is used for carrying out the reference point setting, wherein said signal generating unit, current detecting unit, direction unit and reference point setting unit are connected respectively to analysis and processing unit.
In the device of searching line-to-ground fault point described in the utility model, described signal generating unit, direction unit, reference point setting unit and analysis and processing unit are positioned at same housing, described current detecting unit comprises a current sensor with pincerlike opening, and described current sensor is connected to analysis and processing unit in housing by connecting line.
In the device of searching line-to-ground fault point described in the utility model, described direction unit comprises the display screen that is used for the display direction sign that is arranged on the direction signs on current sensor and is positioned at housing.
In the device of searching line-to-ground fault point described in the utility model, described signal generating unit, direction unit, reference point setting unit and analysis and processing unit are positioned at same housing, described current detecting unit comprises a current sensor with pincerlike opening, and described current sensor is fixed on described housing and with described analysis and processing unit and is electrically connected to.
In the device of searching line-to-ground fault point described in the utility model, described direction unit comprises the display screen that is positioned on housing and is used for the display direction sign.
In the device of searching line-to-ground fault point described in the utility model, described reference point setting unit comprises button and storage unit, and the transmission current signal of the datum that when described button is pressed, analytic unit calculate is obtained and the phase difference φ b of reference voltage signal store storage unit into.
In the device of searching line-to-ground fault point described in the utility model, described analysis and processing unit is calculated the correction phase place that sends current signal relative datum point place by following formula: φ am '=φ am-φ bm-Δ φ b, wherein φ am is the phase place of the signal content of f0 for the frequency that sends current signal, and φ bm is that the frequency of reference voltage signal is the phase place of the signal content of f0.
In the device of searching line-to-ground fault point described in the utility model, described direction unit indicates by display screen to send direction of current and be " forward " when-90 °<φ am '<90 °; During in 90 °≤φ am '≤180 ° or-180 °≤φ am '≤-90 °, indicate by display screen to send direction of current and be " oppositely ".
In the device of searching line-to-ground fault point described in the utility model, described sender unit comprises the negative output terminal that is used for ground connection be used to the positive output end that connects circuit to be measured and i.
The device of searching line-to-ground fault point of the present utility model, produce a reference voltage signal with transmission voltage signal same frequency by signal receiver is inner, and transmission current signal, reference voltage signal are carried out synchronized sampling, analysis, determine the correction phase place with respect to reference point, the direction and relative amplitude of diverse location transmission current signal on circuit, thereby determine the direction of the transmission current signal in circuit, to locate accurately and rapidly the earth fault on circuit to be measured.Especially, in the utility model, signal receiver only utilizes the phase relation of the reference voltage signal that sends current signal on circuit to be measured and self produce, differentiate each position transmission sense of current on circuit to be measured, thereby locate fast earth fault, and need not to adopt any wired or wireless communication method to communicate by letter with sender unit.
Description of drawings
Fig. 1 is the schematic diagram that the utility model is searched the application scenarios of line-to-ground fault point apparatus.
Fig. 2 is the schematic diagram of signal receiver embodiment in Fig. 1.
Fig. 3 is the schematic diagram of the transmission current signal at A point place in Fig. 1.
Fig. 4 is the schematic diagram of the transmission current signal at B point place in Fig. 1.
Fig. 5 is the schematic diagram of the transmission current signal at D point place in Fig. 1.
Fig. 6 is the schematic diagram of phase place of the transmission current signal at A in Fig. 1, B, C, D each point place.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, 2, the device of searching line-to-ground fault point of the present utility model comprises sender unit 1 and signal receiver 2, wherein sender unit 1 to applying the transmission voltage signal that frequency is f0 (for example sine wave, square wave, triangular wave) between circuit to be measured and ground, sends current signal (due to the existence of stake resistance and distributed capacitance) so that circuit to be measured produces by connecting line 3.Particularly, the positive output end of above-mentioned sender unit 1 is connected to circuit to be measured, negative output terminal ground connection.The transmission current signal that signal receiver 2 detects on above-mentioned circuit to be measured, simultaneously it innerly produces a reference voltage signal with transmission voltage signal same frequency, this signal receiver 2 is by carrying out synchronized sampling, analysis to transmission current signal, reference voltage signal, determine that on circuit to be measured, diverse location sends phase place, direction and the amplitude of current signal, thereby locate accurately and rapidly the earth fault on circuit to be measured.
Signal receiver 2 comprises signal generating unit 21, current detecting unit 22, analysis and processing unit 23, direction unit 25 and reference point setting unit 24.Above-mentioned signal generating unit 21, current detecting unit 22, direction unit 25 and reference point setting unit 24 are connected respectively to analysis and processing unit 23.
Signal generating unit 21 is for generation of a reference voltage signal with the transmission voltage signal same frequency of sender unit 1.
Current detecting unit 22 is for detection of the transmission current signal in the circuit to be measured of Ka Cedianchu.Particularly, this current detecting unit 22 comprises a current sensor with pincerlike opening, may be stuck on circuit to be measured and obtains current signal in circuit to be measured by way of electromagnetic induction.When specific implementation, above-mentioned current sensor with pincerlike opening namely can be connected with other parts of signal receiver 2 by connecting line, also can be fixed on signal receiver 2.
Analysis and processing unit 23 is used for transmission current signal and reference voltage signal that current detecting unit 22 obtains are carried out synchronized sampling, and correction phase am ' and the relative amplitude Im ' at the transmission current signal relative datum point place at computer card measuring point place.Particularly, transmission current signal and the reference voltage signal of 23 pairs of synchronized samplings of this analysis and processing unit, adopt respectively and pay sharp leaf algorithm, calculating the frequency that sends current signal is the phase am of the signal content of f0, the frequency of calculating the reference voltage signal is the phase bm of the signal content of f0, and the datum of storage sends the phase difference φ b of current signal and reference voltage signal, and calculates accordingly the correction phase place of transmission current signal at this moment: φ am '=φ am-φ bm-Δ φ b.
Reference point setting unit 24 is used for carrying out the reference point setting according to transmission current signal and the reference voltage signal of circuit to be measured.Particularly, this reference point setting unit 24 comprises button and storage unit and by above-mentioned button reception reference point, instruction is set.When receiving reference point instruction (for example specific button is pressed) be set, reference point setting unit 24 is calculated with analysis and processing unit 23 Parameter storage that obtains and is arrived storage unit, above-mentioned parameter comprises that datum sends the phase difference φ b of current signal and reference voltage signal, and datum sends the reference value I b of current signal size, and with this as the reference point parameter.
Direction unit 25 is used for calculating according to analysis and processing unit 23 direction that this Ka Cedianchu of correction phase am ' indication that obtains sends current signal.
When specific implementation, signal generating unit 21, direction unit 25, reference point setting unit 24 and analysis and processing unit 23 are positioned at same housing, wherein current detecting unit 22 comprises a current sensor with pincerlike opening, and this current sensor is that current sensor is not fixed on the housing of signal receiver 2 by the analysis and processing unit 23(that connecting line is connected in housing).At this moment, direction unit 25 comprises the direction signs that are arranged on current sensor (such as direction arrow etc.) and is positioned at the display screen that is used for display direction sign (such as " forward ", " oppositely ", direction arrow etc.) of housing.Particularly, above-mentioned direction signs can be arranged on the side of pincerlike opening; Show that the method that the direction signs of screen display show is: when-90 °<φ am '<90 °, be shown as " forward ", the direction signs that arrange on the direction of the transmission current signal of expression Ka Cedianchu and signal receiver are identical; When 90 °≤φ am '≤180 ° or-180 °≤φ am '≤-90 °, be shown as " oppositely ", the direction signs that arrange on the transmission current signal of expression Ka Cedianchu and signal receiver are opposite.
In addition, also signal generating unit 21, direction unit 25, reference point setting unit 24 and analysis and processing unit 23 can be located in same housing, the current sensor with pincerlike opening of current detecting unit 22 is fixed on housing and with analysis and processing unit 23 and is electrically connected to.At this moment, the direction signs that direction unit 25 can save on current sensor, and directly show the transmission direction of current by the display screen that is positioned on housing.
Using signal receiver 2 to carry out reference point when arranging, can select in circuit to be measured to send that direction of current determines a bit as reference point, for example the point of the E in Fig. 1 is (near the junction of sender unit 1 with circuit to be measured, can determine that transmission direction of current is herein pointed to other parts of circuit to be measured by the E point), or (can determine that transmission direction of current herein is to point to circuit to be measured by sender unit 1) on the positive output line of sender unit.after selected reference point, make the direction signs of direction unit 25 of signal receiver 2 with to send the current signal direction identical, analysis and processing unit 23 is calculated the transmission current signal of this moment and the phase differential of reference voltage signal at this moment, when receiving reference point instruction (for example specific button is pressed) be set, reference point setting unit 24 inventory analysis processing units 23 calculate the transmission current signal of acquisition and the phase differential of reference voltage signal: Δ φ b=φ a0-φ b0, wherein φ a0 is that the frequency of the transmission current signal of datum is the phase place of the signal content of f0, φ b0 is that the frequency of corresponding reference voltage signal is the phase place of the signal content of f0.
It is the amplitude Im of the signal content of f0 that above-mentioned analysis and processing unit 23 also can be calculated the frequency that sends current signal, and calculates the relative amplitude that this place sends current signal: Im '=Im/Ib * 100%.And reference point setting unit 24 also is stored in and receives analysis and processing unit when instruction is set 23 and calculate the amplitude I0 that obtains for sending the reference value I b:Ib=I0 of current signal size.
As shown in Figure 1, in circuit to be measured, with earth fault C, the trouble spot stake resistance is R, and the distributed capacitance over the ground of both sides, trouble spot circuit equivalence respectively is C 1, C 2At first by sender unit 1 to applying sinusoidal wave voltage signal: u between circuit to be measured and ground 0(t)=U 0* sin (2 π f 0T), due to the existence of line-to-ground resistance and distributed capacitance, produce sinusoidal wave current signal: the i of transmission am(t)=Iamsin (2 π f 0T+ φ am).
At circuit each point to be measured place, the amplitude Iam that sends current signal is different with phase am, as shown in Figure 3: at the A of circuit to be measured point, send current signal I A=I C1+ I C2+ I R, phase place sends voltage signal φ in advance AThe angle.As shown in Figure 4: at the B of circuit to be measured point, send current signal I B=I C2+ I R, phase place sends voltage signal φ in advance BThe angle.As shown in Figure 5: at the D of circuit to be measured point, send current signal I C=I C2, phase place sends voltage signal φ in advance DThe angle.
In fact, the distributed capacitance over the ground of circuit all exists in whole circuit, send the variation of current signal phase place in actual track as shown in Figure 6, Fig. 6 (b) sends current signal amplitude situation of change along circuit to be measured, Fig. 6 (c) sends current signal phase place situation of change along circuit to be measured, and in Fig. 6 (c), the phase place that sends current signal is all take reference point E place's transmission current signal as benchmark, numerical value is leading for just representing, numerical value is that negative indication lags behind.
Signal receiver 2 is not owing to communicating by letter with sender unit 1, so signal receiver 2 can't be known the phase place that sends voltage signal.The utility model has been introduced " reference point " and has been sent the concept of " the correction phase place " of current signal, the correction phase place of the transmission current signal of " reference point " is 0 °, and on circuit to be measured, the correction phase place of the transmission current signal of other each point is all the relative phase with respect to the transmission current signal of " reference point ".
Signal receiver 2 is that generate by inside presses signal: u with the electric reference that sends the voltage signal same frequency b(t)=U b* sin (2 π f 0T+ φ b), as reference point and the foundation of revising phase calculation.
Using method of searching the device of line-to-ground fault point of the present utility model below is described.
At first the positive output end with sender unit 1 is connected to circuit to be measured, and negative output terminal ground connection is to applying the transmission voltage signal that frequency is f0 between circuit to be measured and ground.
Signal receiver produces a reference voltage signal with transmission voltage signal same frequency.
Signal receiver 2 is stuck on signal positive output line, should blocks measuring point as " reference point ", make the direction signs on signal receiver 2 sides identical with the direction that the transmission current signal flows out on signal positive output line; 2 pairs of signal receivers send current signal, the reference voltage signal carries out synchronized sampling, adopt and pay sharp leaf algorithm, calculating the frequency that sends current signal respectively is amplitude I0, the phase a0 of the signal content of f0, and the frequency of calculating the reference voltage signal is the phase b0 of the signal content of f0.
Press " reference settings " button on signal receiver 2, with this moment signal receiver the card measuring point as the reference point that sends current signal, calculate and store the transmission current signal of datum and the phase differential of reference voltage signal: Δ φ b=φ a0-φ b0; Calculating the frequency that sends current signal is the amplitude I0 of the signal content of f0, and stores this amplitude I0 for sending the reference value I b:Ib=I0 of current signal size.
After completing reference point and arranging, can block the transmission current signal of surveying any point on circuit to be measured with respect to the correction phase am ' of reference point, with according to described correction phase am ', indicate this Ka Cedianchu to send the direction of current signal; The frequency of calculating this Ka Cedianchu transmission current signal is the relative amplitude of the signal content of f0: Im '=Im/Ib * 100%.
After completing reference point and arranging, if block survey at reference point, can obtain following result: send current signal correction phase am '=0, display screen shows that sending direction of current be " forward ", the relative amplitude Im ' of transmission current signal=100%.
Again signal receiver 2 is stuck in any point on circuit to be measured, transmission current signal, the reference voltage signal at 2 pairs of these places of signal receiver carry out synchronized sampling, adopt and pay sharp leaf algorithm, calculating the frequency that sends current signal respectively is amplitude Im, the phase am of the signal content of f0, and the frequency of reference voltage signal is f 0The phase bm of signal content, and calculate the correction phase place that this Ka Cedianchu sends current signal: φ am '=φ am-φ bm-Δ φ b.Synchronous signal receiver 2 also can calculate the relative amplitude that this Ka Cedianchu sends current signal: Im '=Im/Ib * 100%.
Further this Ka Cedianchu of judgement sends the direction of current signal: when-90 °≤φ am '≤90 °, show that the direction that sends current signal be " forward ", on the direction that expression sends current signal and signal receiver 2, the direction signs of setting are identical; When 90 °≤φ am '≤180 ° or-180 °≤φ am '≤-90 °, show that the direction that sends current signal be " oppositely ", on the direction of expression transmission current signal and signal receiver 2, the direction signs of setting are opposite.
That positive output end from sender unit 1 flows out owing to sending current signal, the circuit to be measured of flowing through, earth fault from circuit to be measured flows out at last, flow back to sender unit 1 by ground again, if therefore signal receiver 2 can be indicated the direction that sends current signal, along the direction that sends current signal, pointwise card volume can find earth fault fast.
After detecting correction phase am ', direction and the relative amplitude Im ' that sends the current signal signal on circuit to be measured, can according to circuit and knowledge, determine easily earth fault:
Single-wire line: as Fig. 1, shown in Figure 3, along the direction that sends current signal, rear (as B, D 2 points on circuit to be measured in Fig. 1, Fig. 3 before the earth fault C of circuit to be measured, the relative amplitude (being Im ') that sends current signal can diminish suddenly, the correction phase place that sends simultaneously current signal is at earth fault the most negative (in as Fig. 3 on circuit to be measured C point), after earth fault (as D point on circuit to be measured in Fig. 3), the correction phase place that sends current signal can rise suddenly, according to this feature, can accurately locate earth fault.
Complicated netted circuit: judge according to following features: sending current signal must be to flow out from sender unit 1 output terminal, the circuit to be measured of flowing through, flow out from earth fault at last, flow back to sender unit 1 by ground again, and the correction phase place that sends current signal is the most negative in earth fault.Therefore, when running into branched line, should continue to look into and survey the branch road that the relative amplitude that sends current signal is maximum, correction phase place that send current signal is the most negative, the transmission current signal flows out, after branch road is determined, according to the survey method of looking into of single-wire line, determine at last earth fault again.
The above; it is only the better embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement are within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims (9)

1. a device of searching line-to-ground fault point, comprise sender unit and signal receiver, and wherein said sender unit is used for applying to circuit to be measured the transmission voltage signal that frequency is f0 and sends current signal so that circuit to be measured produces, it is characterized in that: described signal receiver comprises for generation of a signal generating unit with the reference voltage signal of described transmission voltage signal same frequency, current detecting unit for detection of the transmission current signal in circuit to be measured, be used for described transmission current signal and reference voltage signal are carried out synchronized sampling, and calculate the transmission current signal with respect to the analysis and processing unit of the correction phase am ' of datum, be used for circuit to be measured according to described correction phase am ' indication and send the direction unit of direction of current signal and the reference point setting unit that is used for carrying out the reference point setting, wherein said signal generating unit, current detecting unit, direction unit and reference point setting unit are connected respectively to analysis and processing unit.
2. the device of searching line-to-ground fault point according to claim 1, it is characterized in that: described signal generating unit, direction unit, reference point setting unit and analysis and processing unit are positioned at same housing, described current detecting unit comprises a current sensor with pincerlike opening, and described current sensor is connected to analysis and processing unit in housing by connecting line.
3. the device of searching line-to-ground fault point according to claim 2 is characterized in that: described direction unit comprises the display screen that is used for the display direction sign that is arranged on the direction signs on current sensor and is positioned at described housing.
4. the device of searching line-to-ground fault point according to claim 1, it is characterized in that: described signal generating unit, direction unit, reference point setting unit and analysis and processing unit are positioned at same housing, described current detecting unit comprises a current sensor with pincerlike opening, and described current sensor is fixed on described housing and with described analysis and processing unit and is electrically connected to.
5. the device of searching line-to-ground fault point according to claim 4 is characterized in that: described direction unit comprises the display screen that is positioned on housing and is used for the display direction sign.
6. the device of searching line-to-ground fault point according to claim 1, it is characterized in that: described reference point setting unit comprises button and storage unit, and the transmission current signal of the datum that when described button is pressed, analytic unit calculate is obtained and the phase difference φ b of reference voltage signal store storage unit into.
7. the device of searching line-to-ground fault point according to claim 6, it is characterized in that: described analysis and processing unit is calculated the correction phase place that sends current signal relative datum point place by following formula: φ am '=φ am-φ bm-Δ φ b, wherein φ am is the phase place of the signal content of f0 for the frequency that sends current signal, and φ bm is that the frequency of reference voltage signal is the phase place of the signal content of f0.
8. the device of searching line-to-ground fault point according to claim 7 is characterized in that: described direction unit indicates by display screen to send direction of current and be " forward " when-90 °<φ am '<90 °; During in 90 °≤φ am '≤180 ° or-180 °≤φ am '≤-90 °, indicate by display screen to send direction of current and be " oppositely ".
9. the device of searching line-to-ground fault point according to claim 1 is characterized in that: described sender unit comprises be used to the positive output end that connects circuit to be measured and the negative output terminal that is used for ground connection.
CN 201220361707 2012-07-25 2012-07-25 Device of searching grounding fault point of circuit Withdrawn - After Issue CN202994956U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102788934A (en) * 2012-07-25 2012-11-21 深圳市普禄科智能检测设备有限公司 Method and device for finding line ground fault point
CN104360215A (en) * 2014-11-12 2015-02-18 江苏省电力公司淮安供电公司 Detection device for multi-point earthing fault of small bus N600

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102788934A (en) * 2012-07-25 2012-11-21 深圳市普禄科智能检测设备有限公司 Method and device for finding line ground fault point
CN102788934B (en) * 2012-07-25 2015-09-30 深圳市普禄科智能检测设备有限公司 Search method and the device of line-to-ground fault point
CN104360215A (en) * 2014-11-12 2015-02-18 江苏省电力公司淮安供电公司 Detection device for multi-point earthing fault of small bus N600
CN104360215B (en) * 2014-11-12 2017-10-03 江苏省电力公司淮安供电公司 N600 multipoint earth faults detection means

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