CN204832415U - Underground power cable trouble range unit - Google Patents
Underground power cable trouble range unit Download PDFInfo
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- CN204832415U CN204832415U CN201520442036.5U CN201520442036U CN204832415U CN 204832415 U CN204832415 U CN 204832415U CN 201520442036 U CN201520442036 U CN 201520442036U CN 204832415 U CN204832415 U CN 204832415U
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an underground power cable trouble range unit, its characterized in that: including the cable fault detection device that opens circuit, the device links to each other with the A line of cable including protection electric capacity C, potentiometre and voltmeter, protection electric capacity C output, and potentiometre R links to each other with the B line of cable with the parallelly connected back of voltmeter, output to be connected the 220V power between the input that allies oneself with the circuit and the input of protecting electric capacity C. The beneficial effects of the utility model are that, simple structure, convenient to use, the cost is low, can follow that the short circuit can be measured to cable one end, the trouble distance opens circuit, leaks electricity.
Description
Technical field
The invention belongs to field of electrical equipment, relate to the distance measuring equipment of cable short circuit, open circuit, leak current fault, particularly relate to a kind of underground power cable fault location device.
Background technology
Along with the generally application of underground cable, underground cable is often damaged, causes short circuit, open circuit, leak current fault, not only can affect the stable of power supply, even jeopardize personal safety, bring unnecessary trouble or loss, but be very difficult to looking up the fault, therefore find above situation extremely important.
Summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides the underground power cable fault location device that a kind of structure is simple, easy to use.
The present invention is achieved through the following technical solutions:
Underground power cable fault location device of the present invention, it is characterized in that: comprise alternating current evener, it comprises an electric capacity C, and two current coil L1, L2, the current transformer of an induced voltage coil L3 three composition, two current coil L1, L2 is in parallel, the output terminal of electric capacity C connects current coil L1, the input end of L2, current coil L1, L2 is that electric current is equal, two coils that direction of current is contrary, L1 is forward current coil, L2 is negative-phase sequence curent coil, L3 is induced voltage coil, electric capacity C is current limiting capacitance, 1 pin, 2 pin are alternating current input, 3 pin, 4 pin are that electric current exports, 5 pin are zero line, 6 pin, 7 pin are that induced voltage exports, 6 pin, digital voltmeter is connected between 7 pin, change the capacity of electric capacity C, various cable and line fault can be surveyed.
Underground power cable fault location device of the present invention, also comprises cable short circuit, earth detector, and this device connects potentiometer by between 6 pin of alternating current evener, 7 pin, and potentiometer connects voltage amplifier, and voltage amplifier connects voltage table.
Underground power cable fault location device of the present invention; also comprise electric discontinuity of cable pick-up unit; this device comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table; output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.
The balance method of alternating current evener, 3,4,5 pin O point be connected, electric current through electric capacity C to L1, L2 coil, to 3 pin, 4 pin, to O point, to 5 pin, to 1 pin, L1, L2 two electric currents of coil are equal, electric current is contrary, cancel out each other in magnetic field, L3 does not just have induced voltage, and 6 pin, 7 pin just do not have voltage to export.
The method of detection streamer short circuit, current balancing device 3 pin, 4 pin connect cable head A, B phase, and 5 pin connect 4 pin, A, B line to line fault, the electric current of 3 pin through cable A phase to short dot, again from B phase to O point, to 5 pin, the electric current of 4 pin is to O point, again to 5 pin, and head end A, B phase of cable has resistance to short dot, and on 3 pin, 4 pin, electric current is just uneven, 6 pin, 7 pin just have voltage to export, the distance of cable A, B phase short dot and cable head is longer, and resistance is larger, and 6 pin, 7 pin voltages are higher; First correct with the cable of known length and short dot distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of short dot distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable short-circuit position to head end.
The method of detection streamer electric leakage, current balancing device 3 pin, 4 pin connect A, B two-phase of cable head, and cable tail end A, B two-phase is connected, 5 pin ground connection, 3 pin electric currents through the A phase of cable to tail end, then by B phase to electric leakage with clicking and entering; 4 pin electric currents click and enter ground through the B phase of cable to electric leakage.Because leakage is different to the resistance value of 3 pin, 4 pin, so current balancing device is just uneven, 6 pin, 7 pin just have voltage to export, and leakage and cable tail end are apart from longer, and resistance is larger, and 6 pin, 7 pin voltages are higher; First correct with the cable of known length and leakage distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of leakage distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable tail end to leakage.
The method of detection streamer open circuit, voltage is through electric capacity C by cable A phase, because cable A, B two-phase has line capacitance, B phase line just produces capacitance voltage; First correct with the cable of known length and breakpoint distance, adjustment potentiometer, make the corresponding 1 meter of breakpoint distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable open-circuit point to head end.
Because have potentiometer inside circuit, can adjusting resistance size, some step voltage amplifying circuits are had inside voltage amplifier, voltage table detects the voltage levels that voltage amplifier finally exports, the height of the output voltage that potentiometer resistance variable effect voltage table records, by cable short circuit, earth detector connects the cable of known length and short circuit distance in advance, by adjustment potentiometer, make the reading of output voltage and digital voltmeter corresponding consistent with short circuit distance, the i.e. corresponding 1 meter of distance of 1V, after such check and correction completes, the cable under test changing known cable into same model detects, the numeral of voltage table display is exactly the distance of short dot to cable head.Before detection streamer electric leakage, also use the cable of known length and leakage distance, by adjustment potentiometer, proofread, make the corresponding 1 meter of distance of 1V, after having proofreaded, cable under test known cable being changed into same model just can detect.
The invention has the beneficial effects as follows, structure is simple, easy to use, and cost is low, can measure short circuit, open circuit, leak current fault distance from cable one end.
Accompanying drawing explanation
Fig. 1 is electric discontinuity of cable failure detector circuit schematic diagram.
Fig. 2 is the schematic equivalent circuit of alternating current evener.
Fig. 3 is cable short trouble testing circuit schematic diagram.
Fig. 4 is cable leakage testing circuit schematic diagram.
The distance (rice) of the numeral fault in the present invention shown by digital voltmeter.
Embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.
Fig. 1 is electric discontinuity of cable fault test circuitry figure.Electric discontinuity of cable failure detector comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table, output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.Adjustment potentiometer, makes voltage reach within the range of voltage table.Voltage is through electric capacity C by cable A phase, because A, B two-phase has line capacitance, B phase line just produces capacitance voltage; First correct with the cable of known length and breakpoint distance, adjustment potentiometer, makes voltage table show numeral (V) corresponding to the distance (rice) of head end with cable open-circuit point, even if the corresponding 1 meter of breakpoint distance of 1V voltage on voltage table.During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable open-circuit point to head end.
Fig. 2 is alternating current equalizer circuit figure.For solving short circuit, leak current fault, the resistance value of cable line can be made to transfer voltage to, and the present invention devises current balancing device.Current balancing device is by an electric capacity C, and two current coil L1, L2, the current transformer of an induced voltage coil L3 three composition constitutes equivalent electrical circuit, two current coil L1, L2 is in parallel, and the output terminal of electric capacity C connects current coil L1, the input end of L2, current coil L1, L2 is that electric current is equal, two coils that direction of current is contrary, L1 is forward current coil, and L2 is negative-phase sequence curent coil, and L3 is induced voltage coil, and electric capacity C is current limiting capacitance, changes the capacity of electric capacity C, can survey various cable and line fault, 1 pin, 2 pin are alternating current input, 3 pin, 4 pin are that electric current exports, and 5 pin are zero line, 6 pin, 7 pin are that induced voltage exports, 6 pin, digital voltmeter is connected, 3 between 7 pin, 4, 5 pin are connected at O point, and electric current is through electric capacity C to L1, L2 coil, to 3 pin, 4 pin, to O point, to 5 pin, to 1 pin, L1, the electric current of L2 two coil is equal, and electric current is contrary, and cancel out each other in magnetic field, L3 does not just have induced voltage, 6 pin, 7 pin just do not have voltage to export.
Fig. 3 is cable short-circuit test figure.Current balancing device 3 pin, 4 pin connect cable head A, B phase, 5 pin connect 4 pin, AB line to line fault, the electric current of 3 pin through the A phase of cable to short dot, the point from B phase to O again, to 5 pin, the electric current of 4 pin to O point, then to 5 pin, head end A, B phase of cable has resistance to short dot, on 3 pin, 4 pin, electric current is just uneven, and 6 pin, 7 pin just have voltage to export, and the distance of cable A, B phase short dot and cable head is longer, resistance is larger, 6 pin, 7 pin voltages are higher, amplify, adjust through voltage amplifier, and the numeral of voltage table display is exactly the distance of short dot to cable head.
Fig. 4 is cable leakage test pattern.Current balancing device 3 pin, 4 pin connect A, B two-phase of cable head, and cable tail end A, B two-phase is connected, 5 pin ground connection, and 3 pin electric currents to tail end, then click and enter ground by B phase to electric leakage through the A phase of cable.4 pin electric currents click and enter ground through the B phase of cable to electric leakage.Because leakage is different to the resistance value of 3 pin, 4 pin, so current balancing device is just uneven, 6 pin, 7 pin just have voltage to export, leakage and cable tail end longer, resistance is larger, 6 pin, 7 pin voltages are higher, amplify, adjust through voltage amplifier, and the numeral of voltage table display is exactly the distance of tail end to leakage.
Claims (8)
1. a underground power cable fault location device, it is characterized in that: comprise alternating current evener, it comprises an electric capacity C, and two current coil L1, L2, the current transformer of an induced voltage coil L3 three composition, two current coil L1, L2 is in parallel, the output terminal of electric capacity C connects current coil L1, the input end of L2, current coil L1, L2 is that electric current is equal, two coils that direction of current is contrary, L1 is forward current coil, L2 is negative-phase sequence curent coil, L3 is induced voltage coil, electric capacity C is current limiting capacitance, 1 pin, 2 pin are alternating current input, 3 pin, 4 pin are that electric current exports, 5 pin are zero line, 6 pin, 7 pin are that induced voltage exports, 6 pin, digital voltmeter is connected between 7 pin, change the capacity of electric capacity C, various cable and line fault can be surveyed.
2. underground power cable fault location device according to claim 1, it is characterized in that: also comprise cable short circuit, earth detector, this device connects potentiometer by between 6 pin of alternating current evener, 7 pin, potentiometer connects voltage amplifier, and voltage amplifier connects voltage table.
3. underground power cable fault location device according to claim 2; it is characterized in that: also comprise electric discontinuity of cable pick-up unit; this device comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table; output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.
4. underground power cable fault location device according to claim 1, is characterized in that: alternating current evener, and 3,4,5 pin are connected at O point, electric current is through electric capacity C to L1, L2 coil, to 3 pin, 4 pin, to O point, to 5 pin, to 1 pin, L1, L2 two electric currents of coil are equal, and electric current is contrary, cancels out each other in magnetic field, L3 does not just have induced voltage, and 6 pin, 7 pin just do not have voltage to export.
5. underground power cable fault location device according to claim 2, it is characterized in that: cable short circuit, earth detector, current balancing device 3 pin, 4 pin meet cable head A, B phase, 5 pin connect 4 pin, A, B line to line fault, the electric current of 3 pin through the A phase of cable to short dot, the point from B phase to O again, to 5 pin, the electric current of 4 pin is to O point, again to 5 pin, the head end A of cable, B phase has resistance to short dot, 3 pin, on 4 pin, electric current is just uneven, 6 pin, 7 pin just have voltage to export, cable A, the distance of B phase short dot and cable head is longer, resistance is larger, 6 pin, 7 pin voltages are higher, first correct with the cable of known short dot distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of short dot distance of 1V voltage on voltage table, during detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable short-circuit position to head end.
6. underground power cable fault location device according to claim 2, it is characterized in that: cable short circuit, earth detector, current balancing device 3 pin, 4 pin connect A, B two-phase of cable head, cable tail end A, B two-phase is connected, 5 pin ground connection, 3 pin electric currents to tail end, then click and enter ground by B phase to electric leakage through the A phase of cable; 4 pin electric currents click and enter ground through the B phase of cable to electric leakage; Because leakage is different to the resistance value of 3 pin, 4 pin, so current balancing device is just uneven, 6 pin, 7 pin just have voltage to export, and leakage and cable tail end are apart from longer, and resistance is larger, and 6 pin, 7 pin voltages are higher; First correct with the cable of known leakage distance, through voltage amplifier amplification, potentiometer adjustment, make the corresponding 1 meter of leakage distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable tail end to leakage.
7. a underground power cable fault location device; it is characterized in that: comprise electric discontinuity of cable failure detector; this device comprises protection electric capacity C, potentiometer and voltage table; protection electric capacity C output terminal is connected with the A line of cable; after potentiometer R is in parallel with voltage table; output terminal is connected with the B line of cable, and the input end of parallel circuit is connected 220V power supply with between the input end of protection electric capacity C.
8. underground power cable fault location device according to claim 7, is characterized in that: electric discontinuity of cable failure detector, and voltage is through electric capacity C by cable A phase, because cable A, B two-phase has line capacitance, B phase line just produces capacitance voltage; First correct with the cable of known length and breakpoint distance, adjustment potentiometer, make the corresponding 1 meter of breakpoint distance of 1V voltage on voltage table; During detection, change correction electricity consumption cable into same model cable to be determined, the voltage digital (V) of voltage table display is just equal to the distance (rice) of cable open-circuit point to head end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520442036.5U CN204832415U (en) | 2015-06-25 | 2015-06-25 | Underground power cable trouble range unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520442036.5U CN204832415U (en) | 2015-06-25 | 2015-06-25 | Underground power cable trouble range unit |
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| Publication Number | Publication Date |
|---|---|
| CN204832415U true CN204832415U (en) | 2015-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520442036.5U Withdrawn - After Issue CN204832415U (en) | 2015-06-25 | 2015-06-25 | Underground power cable trouble range unit |
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| Country | Link |
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| CN (1) | CN204832415U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044553A (en) * | 2015-06-25 | 2015-11-11 | 邵珠真 | Underground power cable fault distance measuring device |
-
2015
- 2015-06-25 CN CN201520442036.5U patent/CN204832415U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044553A (en) * | 2015-06-25 | 2015-11-11 | 邵珠真 | Underground power cable fault distance measuring device |
| CN105044553B (en) * | 2015-06-25 | 2018-02-09 | 邵珠真 | Underground power cable fault location device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151202 Effective date of abandoning: 20180209 |
|
| AV01 | Patent right actively abandoned |