CN101290339B - High-voltage cable trouble point checking method and its device - Google Patents
High-voltage cable trouble point checking method and its device Download PDFInfo
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- CN101290339B CN101290339B CN2007100396969A CN200710039696A CN101290339B CN 101290339 B CN101290339 B CN 101290339B CN 2007100396969 A CN2007100396969 A CN 2007100396969A CN 200710039696 A CN200710039696 A CN 200710039696A CN 101290339 B CN101290339 B CN 101290339B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to a method and a device for detecting a high-voltage cable fault point. The device comprises a low-voltage adjustable DC power connected with one end of the cable, a polarity convertor, a DC ammeter and a high internal resistance voltmeter, wherein, another high internal resistance voltmeter is connected with the other end of the cable. In the detecting process, the voltage value at two ends of the high internal resistance voltmeter is recorded by adjusting the DC current and the match of the polarity convertor with the DC ammeter, and the position of the cable fault point is calculated by related formula. The method adopts the low-voltage DC power supply detection and solves the problems of the prior cable that the high-resistor fault detection needs to adopt the high-voltage detection and various harms are caused. In addition, the device is convenient to carry and has low cost, stability and high accuracy.
Description
Technical field
The present invention relates to the cable detection in maintenance of equipment field, more particularly, relate to a kind of high-voltage cable trouble point checking method and device thereof.
Background technology
During high resistive power cable fault point distance detecting, the measuring method of generally using is to adopt High-Voltage Test Technology at present, the main measuring method that adopts towards sudden strain of a muscle method and high-tension bridge method, and domestic and foreign literature introduction at present and practical application also have only the high voltage of employing mode to solve, seek high resistance earthing fault with the high-tension bridge method, its connection principle as shown in Figure 1 because trouble spot resistance is big, must use high-voltage DC power supply, unlikely too little to guarantee by the electric current of trouble spot.The high-tension bridge method also only is only applicable to the high resistive cable grounding fault of stability, is not suitable for cable inner fault detect that discharge is arranged under the high-voltage dc voltage effect.And high resistive Method of Cable Trouble Point flashover fault often, intermittence fault resstance instability under the high-voltage dc voltage effect, there are unsettled electric discharge phenomena, cause current in the fault point suddenly big or suddenly small, even internal flashover punctures and to make current surge, not only measurement is difficult to carry out, and also can damage galvanometer, and certain limitation is arranged.Extensively apply to industry-by-industry at present with the electric cable failure detector that becomes towards sudden strain of a muscle method principle design, towards sudden strain of a muscle method test philosophy as shown in Figure 2, but aspect much, use and remove to solve cable fault, just survey failsafe at all, and probably can produce serious consequence towards the sudden strain of a muscle method.Because use when the sudden strain of a muscle method is found range to the resistive fault of height, when existing the trouble spot can not disruptive discharge or discharge when insufficient, must adopt outside big electric current, high voltage impact the trouble spot, also must carry out frequent, the repetitive shock of long period, until the complete disruptive discharge of Method of Cable Trouble Point.Though help the detection of fault like this, but can cause bigger injury for the major insulation of cable own simultaneously, lay for direct-buried mode especially, the cable that the time limit that puts into operation is long, because cable is subjected to phreatic infringement for a long time, major insulation can produce deterioration in various degree inevitably, if at this moment still adopt continuous high pressure to measure towards the sudden strain of a muscle method, then bigger to cable harmfulness, can cause scrapping of whole return cable when serious and change.The power cable that lays for the tunnel directly uses " towards the sudden strain of a muscle method " to go test failure simultaneously, jeopardizes the safe operation of adjacent cable sometimes.
Summary of the invention
Defectives such as high voltage test that exists at present common cable fault point detecting method and poor stability, the purpose of this invention is to provide a kind of stable high high-voltage cable trouble point checking method and device thereof of low-voltage, this device carries also very convenient.
For achieving the above object, one aspect of the present invention provides a kind of high-voltage cable trouble point checking method, may further comprise the steps:
A. at an end of high-tension cable, the adjustable direct supply of low-voltage is connected with the input end of polarity converter by DC ammeter, an output terminal of described polarity converter is connected with the normal conductor heart yearn of described high-tension cable, another output terminal of described polarity converter is connected with the screen layer copper strips of described high-tension cable, one end of high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable;
B. at the other end of high-tension cable, one end of another high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable, the normal conductor heart yearn of described high-tension cable is connected with the screen layer copper strips of described high-tension cable;
C. the adjustable direct supply of described low-voltage is begun to regulate from no-voltage, when the numerical value of described DC ammeter reaches a predetermined value, stop to regulate the adjustable direct supply of described low-voltage, write down the magnitude of voltage of described high internal resistance voltage table of a step and the described high internal resistance voltage table of b step respectively;
D. the adjustable direct supply voltage of described low-voltage is returned zero, change the output polarity of described polarity converter;
E. the adjustable direct supply of described low-voltage is begun to regulate from no-voltage, when the numerical value of described DC ammeter reaches the described predetermined value of c step, stop to regulate the adjustable direct supply of described low-voltage, write down the magnitude of voltage of described high internal resistance voltage table of a step and the described high internal resistance voltage table of b step respectively;
F. calculate the mean value of the magnitude of voltage of twice record of two high internal resistance voltage tables described in described c and the e step respectively;
G. calculate the distance of high resistive trouble spot of described high-tension cable and the adjustable direct supply of described low-voltage position according to following formula: { the described high internal resistance voltage table mean value of a step/(the described high internal resistance voltage table mean value of a step+described high internal resistance voltage table mean value of b step) } * high-tension cable is measured length.
The adjustable direct supply of the low-voltage of described a step is the low-voltage dc power supply of 30V.
Described a step also has a D.C. voltmeter, and the two ends of described D.C. voltmeter are connected with two output terminals of described polarity converter respectively.
One predetermined value of the described DC ammeter of described c step is 10A.
Described high-voltage cable trouble point checking method can detect to the high resistive fault more than the 1M Ω of the high-tension cable generation of 220KV 3KV.
The present invention provides a kind of high-voltage cable trouble point pick-up unit on the other hand, it is characterized in that, comprising:
The direct supply output unit, be positioned at an end of described high-tension cable, described continuous-current plant comprises low-voltage dc power supply and the polarity converter that is connected with described low-voltage dc power supply, an output terminal of described polarity converter is connected with the normal conductor heart yearn of described high-tension cable, and another output terminal of described polarity converter is connected with the screen layer copper strips of described high-tension cable;
The other end of described high-tension cable is connected the normal conductor heart yearn of high-tension cable with the screen layer copper strips of high-tension cable;
DC ammeter, described low-voltage dc power supply is connected with the input end of described polarity converter by described DC ammeter;
Two high internal resistance voltage tables,
A described high internal resistance voltage table and described direct supply output unit are in same position, one end of described high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable
Another described high internal resistance voltage table is positioned at the other end of described high-tension cable, and an end of described high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, and the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable.
The low-voltage dc power supply of described direct supply output unit is the adjustable direct supply of low-voltage, and the adjustable direct supply of described low-voltage is the low-voltage dc power supply of 30V.
Described high-voltage cable trouble point pick-up unit also comprises D.C. voltmeter, and the two ends of described D.C. voltmeter are connected with two output terminals of described polarity converter respectively.
Described high-voltage cable trouble point pick-up unit can detect to the high resistive fault more than the 1M Ω of the high-tension cable generation of 220KV 3KV.
Adopt a kind of high-voltage cable trouble point checking method of the present invention and device thereof,, must adopt the high voltage detection and produce the problem of various harm with regard to having solved the high resistive fault detect of present high-tension cable owing to adopted the low-voltage dc power supply of 30V; These apparatus and method utilize the shielding copper strips of the normal conductor heart yearn of failure cable and failure cable as measuring the loop, it is impartial principle that every meter pressure drop is measured on the shielding copper strips of cable on the loop in utilization, just can quick and accurately obtain a result by the simple computation after measuring; This device only comprises several better simply parts in addition, suitable cheap of cost, price generally be equivalent on the present market same device 1/20, and the testing staff to carry this device very convenient, be fit to very much field work.
Description of drawings
Fig. 1 is traditional high-tension bridge detection method principle schematic;
Fig. 2 is that traditional sudden strain of a muscle method of dashing detects principle schematic;
Fig. 3 is a measurement mechanism circuit theory synoptic diagram of the present invention;
Fig. 4 is an Application Example synoptic diagram of the present invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
With reference to figure 3 and Fig. 4, first talk about principle of the present invention, it is even along the line that its ultimate principle is based on described cable, and the characteristics that cable length and conductor core wire resistance and shielding copper strips resistance are directly proportional are utilized the normal conductor heart yearn R of failure cable
S, fault conductor core wire R
T(contain R
T1And R
T2) and screen layer copper strips R
G(contain R
G1And R
G2) as measuring the loop, on the measurement loop, add an adjustable low-voltage dc power supply E
dAfter, cable shield copper strips R then
GLast every meter pressure drop also is impartial.Utilize fault conductor core wire R
TMake slotted line, by cable fault stake resistance R
fWith screen layer copper strips R
GConstitute the measurement loop of voltage, with high internal resistance voltage table V
1And V
2Measure trouble spot two end shield layer copper strips R respectively
GVoltage, and the length of proportionate relationship by voltage and measured cable is calculated and is demarcated the distance of position of failure point.In this process in order to eliminate the earth potential E at Method of Cable Trouble Point place
S, the present invention has adopted the direct supply E of convertible polarity
d, direct supply E
dThe conversion of polarity realizes by connected polarity converter K.
Concrete calculating as follows:
1) screen layer copper strips R
GPressure drop V
1, V
2Measurement
Normal conductor heart yearn R
SOn:
Add positive polarity voltage: V
11=V
RG1+ E
S-(1)
V
21＝-V
RG2+E
S-(2)
Add reverse voltage: V
12=-V
RG1+ E
S-(3)
V
22＝+V
RG2+E
S-(4)
V
1Virtual voltage calculate (earth potential E
SRemoving method)
V
1＝(V
11-V
12)/2＝[(V
RG1+E
S)-(-V
RG1+E
S)]/2
＝(V
RG1+V
RG1)/2＝V
RG1
V
2Virtual voltage calculate (earth potential E
SRemoving method):
V
1＝(V
22-V
21)/2＝[(V
RG2+E
S)-(-V
RG2+E
S)]/2
＝(V
RG2+V
RG2)/2＝V
RG2
2) calculating of trouble spot distance X:
X＝(V
RG1/V
RG1+V
RG2)×L
More than in, X is that Method of Cable Trouble Point is to measuring direct supply E
dDistance, L is the length of measured cable.
With reference to figure 3 and Fig. 4, described high-voltage cable trouble point pick-up unit comprises with lower member: the direct supply output unit, be positioned at an end of described high-tension cable, and described continuous-current plant comprises direct supply E
dAnd with described direct supply E
dThe polarity converter K that connects, described polarity converter K has two input ends, described two input ends respectively with described direct supply E
dTwo output terminals connect, one of them input end is by DC current Table A and direct supply E
dOutput terminal connect.The normal conductor heart yearn R of the output terminal of described polarity converter K and described high-tension cable
SConnect the screen layer copper strips R of another output terminal of described polarity converter and described high-tension cable
GConnect, also have a DC voltage Table V to be connected, regulate direct supply E to observe with two output terminals of described polarity converter
dThe time voltage condition; Two high internal resistance voltage table V
1And V
2, described high internal resistance voltage table V
1With described direct supply output unit in same position, described high internal resistance voltage table V
1An end and the fault conductor core wire R of described high-tension cable
TConnect described high internal resistance voltage table V
1The other end and the screen layer copper strips R of described high-tension cable
GConnect described high internal resistance voltage table V
2Be positioned at the other end of described high-tension cable, described high internal resistance voltage table V
2An end and the fault conductor core wire R of described high-tension cable
TConnect described high internal resistance voltage table V
2The other end and the screen layer copper strips R of described high-tension cable
GConnect.
The direct supply E of described direct supply output unit
dBe adjustable direct supply, and be the low-voltage dc power supply of 30V.
The course of work below by to the described once high-voltage cable trouble point pick-up unit of explanation of described high-voltage cable trouble point checking method said method comprising the steps of:
A. at an end of high-tension cable, with adjustable direct supply E
dBe connected the normal conductor heart yearn R of the output terminal of described polarity converter K and described high-tension cable with the input end of polarity converter K by a DC current Table A
SConnect the screen layer copper strips R of another output terminal of described polarity converter K and described high-tension cable
GConnect, with high internal resistance voltage table V
1An end and the fault conductor core wire R of described high-tension cable
TConnect, with described high internal resistance voltage table V
1The other end and the screen layer copper strips R of described high-tension cable
GConnect;
B. at the other end of high-tension cable, with a high internal resistance voltage table V
2An end and the fault conductor core wire R of described high-tension cable
TConnect, with described high internal resistance voltage table V
2The other end and the screen layer copper strips R of described high-tension cable
GConnect, with the normal conductor heart yearn R of described high-tension cable
SScreen layer copper strips R with described high-tension cable
GConnect;
C. referring to the demonstration of DC voltage Table V, with described adjustable direct supply E
dBegin to regulate from no-voltage, when the numerical value of described DC current Table A reaches 10A, stop to regulate described adjustable direct supply E
d, write down the described high internal resistance voltage table V of a step respectively
1With the described high internal resistance voltage table V of b step
2Magnitude of voltage;
D. with described adjustable direct supply E
dVoltage returns zero, changes the output polarity of described polarity converter K;
E. referring to the demonstration of DC voltage Table V, with described adjustable direct supply E
dBegin to regulate from no-voltage, when the numerical value of described DC current Table A reaches 10A, stop to regulate described adjustable direct supply E
d, write down the described high internal resistance voltage table V of a step respectively
1With the described high internal resistance voltage table V of b step
2Magnitude of voltage;
F. calculate two high internal resistance voltage table V described in described c and the e step respectively
1And V
2The mean value of magnitude of voltage of twice record;
G. calculate high resistive trouble spot of described high-tension cable and described adjustable direct supply E according to following formula
dThe distance X of position: { high internal resistance voltage table V
1Mean value/(high internal resistance voltage table V
1Mean value+high internal resistance voltage table V
2Mean value) } * high-tension cable measurement length L.
Described high-voltage cable trouble point checking method and device can detect to the high resistive fault more than the 1M Ω of the high-tension cable generation of 220KV 3KV.
Be the embodiment of a detection failure cable below:
The high-tension cable parameter that detects:
Model: YJV-6/10kV; Measure length (L): 745m; Cross section: single core 185mm2; System of laying: tunnel style; Trouble spot fault ground resistance is: 4M Ω.
1, changes the correlation values that detects before the output polarity of polarity converter K
Adjustable direct supply E
dOutput: 30.9V;
The numerical value of DC current Table A: 10A;
High internal resistance voltage table V
1Magnitude of voltage: 4.231V;
High internal resistance voltage table V
2Magnitude of voltage: 5.682V;
2, change the correlation values that detects behind the output polarity of polarity converter K
Adjustable direct supply E
dOutput: 30.9V;
The numerical value of DC current Table A: 10A;
High internal resistance voltage table V
1Magnitude of voltage: 4.266V;
High internal resistance voltage table V
2Magnitude of voltage: 5.735V;
3, fault distance calculates
High internal resistance voltage table V
1Average voltage level: 4.25V;
High internal resistance voltage table V
2Average voltage level: 5.71V;
The trouble spot from the distance of the adjustable direct supply Ed of proving installation is:
High internal resistance voltage table V
1Mean value/(high internal resistance voltage table V
1Mean value+high internal resistance voltage table V
2Magnitude of voltage) * cable length, promptly
4.25/(4.25+5.71)×745＝318m
Behind the pinpoint, find physical fault point at the 330m place, absolute error is 1.6%, and all working to the location from measuring distance has 3 people to finish in 30 minutes.
As can be seen from the above embodiments, the present invention can fast detect the localization of faults accurately, reaches the purpose requirement of invention fully, fully realistic need of work.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (9)
1. a high-voltage cable trouble point checking method is characterized in that, may further comprise the steps:
A. at an end of high-tension cable, the adjustable direct supply of low-voltage is connected with the input end of polarity converter by DC ammeter, an output terminal of described polarity converter is connected with the normal conductor heart yearn of described high-tension cable, another output terminal of described polarity converter is connected with the screen layer copper strips of described high-tension cable, one end of high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable;
B. at the other end of high-tension cable, one end of another high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable, the normal conductor heart yearn of described high-tension cable is connected with the screen layer copper strips of described high-tension cable;
C. the adjustable direct supply of described low-voltage is begun to regulate from no-voltage, when the numerical value of described DC ammeter reaches a predetermined value, stop to regulate the adjustable direct supply of described low-voltage, write down the magnitude of voltage of described high internal resistance voltage table of a step and the described high internal resistance voltage table of b step respectively;
D. the adjustable direct supply voltage of described low-voltage is returned zero, change the output polarity of described polarity converter;
E. the adjustable direct supply of described low-voltage is begun to regulate from no-voltage, when the numerical value of described DC ammeter reaches the described predetermined value of c step, stop to regulate the adjustable direct supply of described low-voltage, write down the magnitude of voltage of described high internal resistance voltage table of a step and the described high internal resistance voltage table of b step respectively;
F. calculate the mean value of the magnitude of voltage of twice record of two high internal resistance voltage tables described in described c and the e step respectively;
G. calculate the distance of high resistive trouble spot of described high-tension cable and the adjustable direct supply of described low-voltage position according to following formula: { the described high internal resistance voltage table mean value of a step/(the described high internal resistance voltage table mean value of a step+described high internal resistance voltage table mean value of b step) } * high-tension cable is measured length.
2. high-voltage cable trouble point checking method according to claim 1 is characterized in that the adjustable direct supply of the low-voltage of described a step is the low-voltage dc power supply of 30V.
3. high-voltage cable trouble point checking method as claimed in claim 1 or 2 is characterized in that described a step also has a D.C. voltmeter, and the two ends of described D.C. voltmeter are connected with two output terminals of described polarity converter respectively.
4. high-voltage cable trouble point checking method according to claim 1 is characterized in that a predetermined value of the described DC ammeter of described c step is 10A.
5. high-voltage cable trouble point checking method according to claim 1 is characterized in that, the high resistive fault more than the 1M Ω that described high-voltage cable trouble point checking method can take place to the high-tension cable of 220KV 3KV detect.
6. a high-voltage cable trouble point pick-up unit is characterized in that, comprising:
The direct supply output unit, be positioned at an end of described high-tension cable, described continuous-current plant comprises low-voltage dc power supply and the polarity converter that is connected with described low-voltage dc power supply, an output terminal of described polarity converter is connected with the normal conductor heart yearn of described high-tension cable, and another output terminal of described polarity converter is connected with the screen layer copper strips of described high-tension cable;
The other end of described high-tension cable is connected the normal conductor heart yearn of high-tension cable with the screen layer copper strips of high-tension cable;
DC ammeter, described low-voltage dc power supply is connected with the input end of described polarity converter by described DC ammeter;
Two high internal resistance voltage tables,
A described high internal resistance voltage table and described direct supply output unit are in same position, one end of described high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable
Another described high internal resistance voltage table is positioned at the other end of described high-tension cable, and an end of described high internal resistance voltage table is connected with the fault conductor core wire of described high-tension cable, and the other end of described high internal resistance voltage table is connected with the screen layer copper strips of described high-tension cable.
7. as high-voltage cable trouble point pick-up unit as described in the claim 6, it is characterized in that the low-voltage dc power supply of described direct supply output unit is the adjustable direct supply of low-voltage, the adjustable direct supply of described low-voltage is the low-voltage dc power supply of 30V.
8. as high-voltage cable trouble point pick-up unit as described in the claim 6, it is characterized in that described high-voltage cable trouble point pick-up unit also comprises D.C. voltmeter, the two ends of described D.C. voltmeter are connected with two output terminals of described polarity converter respectively.
9. as high-voltage cable trouble point pick-up unit as described in the claim 6, it is characterized in that the high resistive fault more than the 1M Ω that described high-voltage cable trouble point pick-up unit can take place to the high-tension cable of 220KV 3KV detect.
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| CN2007100396969A CN101290339B (en) | 2007-04-20 | 2007-04-20 | High-voltage cable trouble point checking method and its device |
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|---|---|---|---|
| CN2007100396969A CN101290339B (en) | 2007-04-20 | 2007-04-20 | High-voltage cable trouble point checking method and its device |
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| CN101290339A CN101290339A (en) | 2008-10-22 |
| CN101290339B true CN101290339B (en) | 2010-10-06 |
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| CN2007100396969A Expired - Fee Related CN101290339B (en) | 2007-04-20 | 2007-04-20 | High-voltage cable trouble point checking method and its device |
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| CN102298104B (en) * | 2010-06-25 | 2016-01-13 | 上海宝钢工业检测公司 | A kind of method for detecting ground fault of bridge cable |
| CN102879682A (en) * | 2012-09-26 | 2013-01-16 | 国家电网公司 | Cable fault tester |
| CN102967796A (en) * | 2012-10-31 | 2013-03-13 | 陕西海泰电子有限责任公司 | Detecting method for short dot position of cable |
| CN105203925A (en) * | 2015-10-12 | 2015-12-30 | 国家电网公司 | Method for online detecting fault sections of 110-KV or 220-KV cable lines |
| CN106950478B (en) * | 2017-04-25 | 2023-12-22 | 南方电网科学研究院有限责任公司 | GIS equipment internal joint overheat fault simulation test device and method |
| CN110554295A (en) * | 2018-06-04 | 2019-12-10 | 中冶天工集团有限公司 | method for searching power cable insulation fault point by using high-precision multimeter |
| EP3588111B1 (en) * | 2018-06-29 | 2022-08-17 | ABB Schweiz AG | Partial discharge monitoring system with a compatibility-function for a voltage indication system |
| CN110045238A (en) * | 2019-04-09 | 2019-07-23 | 山东鲁源电气股份有限公司 | Cable shield fault determination method, device, equipment and storage medium |
| CN116660597B (en) * | 2023-07-31 | 2023-11-07 | 国网天津市电力公司城西供电分公司 | High-voltage cable fault detection method and device |
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