CN109188201B - Method for safely and quickly searching street lamp line fault - Google Patents
Method for safely and quickly searching street lamp line fault Download PDFInfo
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- CN109188201B CN109188201B CN201811015251.1A CN201811015251A CN109188201B CN 109188201 B CN109188201 B CN 109188201B CN 201811015251 A CN201811015251 A CN 201811015251A CN 109188201 B CN109188201 B CN 109188201B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses a method for safely and quickly searching for a street lamp line fault, which comprises the following steps of; selecting the size of the series capacitor according to the power supply radius of the street lamp branch fault cable and the property of the lamp; respectively connecting capacitors with proper capacity in series in A, B, C three-phase outgoing cables, measuring zero sequence current of the outgoing fault cables in a power distribution cabinet, if the zero sequence current exists, judging that a ground fault point is on an N phase, and adding voltage between any phase A, B, C and the N phase; if the situation that zero-sequence current exists in any phase of A, B, C is found, the grounding fault point is judged to be on the phase, voltage is added between the fault phase and the N phase, the zero-sequence current of the cable A, B, C and the N phase is measured from the high-precision clamp-on ammeter to the lamp post, the grounding fault point between two poles or the lamp post leading-up line can be judged according to the mutation point of the zero-sequence current, and the method for safely and quickly searching the grounding fault of the street lamp line can be used for most lamp posts with normal diameters.
Description
Technical Field
The invention relates to a method for searching line faults, in particular to a method for safely and quickly searching ground faults of a street lamp line.
Background
When the leakage protection is installed on the street lamp line, the leakage protection can act in time when the line has a fault, most of the line faults needing to be processed are no longer similar to the faults which are obvious in direct grounding in the prior art, the fault points of the street lamp line are difficult to find by using a method of measuring direct current resistance by a universal meter, and a new safe and effective method needs to be further explored. Therefore, a method capable of safely and quickly searching for the fault of the street lamp line is provided.
Disclosure of Invention
The invention aims to provide a method for safely and quickly searching for a street lamp line fault, which has the advantages that the method for safely and quickly searching for the ground fault of the street lamp line can be used for most lamp poles with normal diameters, and the problems in the background art are solved.
In order to achieve the purpose, the invention provides the following technical scheme: a method for safely and quickly searching for a street lamp line fault comprises the following steps;
s1: selecting the size of the series capacitor according to the power supply radius of the fault cable of the street lamp branch and the property of the lamp;
s2: if the lamp is a high-voltage sodium lamp, 1-5 connection modes with 50 muF capacitors connected in parallel can be connected in series in the fault cable;
s3: if the LED lamp is used, a wiring mode that 1-3 12 muF capacitors are connected in series or 1-2 6 muF capacitors are connected in series can be adopted in the fault cable;
s4: a, B, C and N-phase zero sequence current are measured on a branch fault cable of the power distribution cabinet, the total leakage current of the whole branch is known, and meanwhile, sudden change of the zero sequence current caused by the fact that the position of the cable is changed by turning in the fault finding process is observed, and the hidden ground fault of the cable is found in time;
s5: the voltage of the cable with the fault phase is controlled below 50V by switching on and off the single-pole air switch and selecting a capacitor with proper capacity in the series circuit, A, B, C zero-sequence currents of N phases are measured from the lamp post by a high-precision clamp-on ammeter, and the grounding fault point between the two poles or on the leading line of the lamp post is judged according to the mutation point of the zero-sequence currents.
Preferably, in step S2, the capacitors with different capacities are connected in parallel by 1QF to 3QF according to the branch load, so as to change the total capacitance of the series circuit.
Preferably, in step S3, the capacitors with different capacities are adjusted by dividing and combining 1QF and 2QF according to the sizes of the branch loads, so as to change the size of the total capacitance of the series circuit.
Preferably, in step S4, a clamp ammeter is placed at the cable of the power distribution cabinet, and the change of the zero sequence current is checked at any time, so that when others change the cable position by flipping during the fault finding process, sudden change of the zero sequence current may be caused, and a hidden ground fault of the cable is found in time.
Preferably, capacitors with proper capacity are respectively connected in series in A, B, C three-phase outgoing cables, zero sequence currents of outgoing fault cables are measured in a power distribution cabinet, if the zero sequence currents exist, it is judged that a ground fault point is located on an N phase, and voltage is added between any phase A, B, C and the N phase; if it is found that zero sequence current exists in any phase A, B, C, the earth fault point is judged to be on the phase, and voltage is applied to the fault phase and the N phase.
Preferably, in step S5, A, B, C and N-phase zero-sequence currents are measured from the lamp post by using a high-precision clamp-on ammeter, and according to the discontinuity of the zero-sequence currents, it is determined between which two poles the ground fault point is located or on the lamp post lead.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for safely and quickly searching the line fault of the street lamp, the capacity of the capacitor connected in series in the fault cable is selected according to the size and the property of the load, so that the voltage applied to the fault cable is controlled to be below 50V, and the safety of the fault searching process is ensured; the method is a safer and faster method for searching the ground fault of the street lamp line and can be used for most lamp poles with normal diameters.
Drawings
FIG. 1 is a schematic diagram of a high pressure sodium lamp of the present invention;
FIG. 2 is a schematic diagram of the series capacitor of the present invention;
FIG. 3 is a schematic diagram of the detection of series capacitance in the cable loop of the high pressure sodium lamp of the present invention;
FIG. 4 is a first schematic diagram of the detection of the series capacitance in the cable loop of the LED lamp according to the present invention;
fig. 5 is a schematic diagram of a detection principle of a series capacitor in a cable loop of the LED lamp according to the present invention.
Detailed Description
The technical scheme in the embodiment of the invention will be made clear below by combining the attached drawings in the embodiment of the invention; fully described, it is to be understood that the described embodiments are merely exemplary of some, but not all, embodiments of the invention and that all other embodiments, which can be derived by one of ordinary skill in the art based on the described embodiments without inventive faculty, are within the scope of the invention.
A method for safely and quickly searching for a street lamp line fault comprises the following steps;
referring to fig. 1, according to the principle of the lamp, since the lamp is not lit when the trigger is at a low voltage of 50V ac, the resistance between the triggers a, b, and C is very large, and through experiments, the resistance and inductance of the cable have very small influence on the load, and the influence on the measurement result is the capacitance on the lamp, only the capacitance of the lamp is shown, the schematic diagram is roughly as shown in fig. 2, C is the total capacitance connected in series during measurement, C is the total capacitance connected in series, C is the capacitance on the lamp, and1cn refers to the capacitance across the lamp. A capacitor is connected in series between the alternating current 220V and the outgoing cable, the larger the capacitance value is, the higher the voltage applied to the outgoing cable is, and one principle is that the lamp cannot be lightened, otherwise, the judgment of a fault point is influenced.
The method comprises the following steps: selecting the size of the series capacitor according to the power supply radius of the fault cable of the street lamp branch and the property of the lamp;
step two: referring to fig. 3, if the lamp is a high-voltage sodium lamp, 1 to 5 capacitors of 50 μ F can be connected in series in the fault cable in parallel, and capacitors of different capacities are connected or disconnected in parallel by 1QF to 3QF according to the magnitude of the branch load, so as to change the magnitude of the total capacitor of the series circuit, and control the voltage applied to the fault cable below 50 v;
step three: referring to fig. 4-5, if the LED lamp is used, 1 to 3 capacitors of 12 μ F or 1 to 2 capacitors of 6 μ F can be connected in series in the faulty cable, and 1QF and 2QF can be separated to adjust the capacitors with different capacities, so as to control the voltage applied to the faulty cable below 50 v;
step four: a, B, C and N-phase zero sequence currents are measured on a branch fault cable of a power distribution cabinet, the total leakage current of the whole branch is known, meanwhile, sudden change of the zero sequence current caused by the fact that the position of the cable is changed by turning in the fault finding process is observed, the hidden ground fault of the cable is found in time, when voltage is added to the A, B, C three phases of the fault cable, the zero sequence current is found to exist, the ground fault point is judged to be on the N phase, the voltage can be loaded on any phase of A, B, C and the N phase when the fault is found, and if the fault phase is any phase of A, B, C, the voltage is added on the fault phase and the N phase.
If the device is connected in series, a fuse or a single-pole air switch of the device immediately trips, the loop current exceeds 10A, the fault point is obvious, and a universal meter is used for troubleshooting in a power failure state; if the situation is normal after the device is connected in series, checking the numerical value of a zero sequence ammeter by different phases of the serial branch cables, and judging which phase of cable has a ground fault;
step five: the voltage of the cable with the fault phase is controlled below 50V by switching on and off the single-pole air switch and selecting a capacitor with proper capacity in the series circuit, A, B, C zero-sequence currents of N phases are measured from the lamp post by a high-precision clamp-on ammeter, and the grounding fault point between the two poles or on the leading line of the lamp post is judged according to the mutation point of the zero-sequence currents.
In summary, according to the method for safely and quickly searching the ground fault of the street lamp line, the capacitor with the appropriate capacity is connected in series in the fault cable loop, so that the voltage applied to the fault cable is controlled to be below 50V, the ABCN zero sequence current is measured at the lamp post, and the mutation point of the zero sequence current is found out, so that the position of the fault point is judged.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (5)
1. A method for safely and quickly searching for a street lamp line fault is characterized by comprising the following steps;
s1: selecting the size of the series capacitor according to the power supply radius of the fault cable of the street lamp branch and the property of the lamp;
s2: if the lamp is a high-voltage sodium lamp, 1-5 connection modes with 50 muF capacitors connected in parallel can be connected in series in the fault cable;
s3: if the LED lamp is used, a wiring mode that 1-3 12 muF capacitors are connected in series or 1-2 6 muF capacitors are connected in series can be adopted in the fault cable;
s4: a, B, C and N-phase zero sequence current are measured on a branch fault cable of the power distribution cabinet, the total leakage current of the whole branch is known, and meanwhile, sudden change of the zero sequence current caused by the fact that the position of the cable is changed by turning in the fault finding process is observed, and the hidden ground fault of the cable is found in time;
s5: the voltage of the cable with the fault phase is controlled below 50V by switching on and off the single-pole air switch and selecting a capacitor with proper capacity in the series circuit, A, B, C zero-sequence currents of N phases are measured from the lamp post by a high-precision clamp-on ammeter, and the grounding fault point between the two poles or on the leading line of the lamp post is judged according to the mutation point of the zero-sequence currents.
2. The method for safely and quickly finding the fault of the street lamp line according to claim 1, is characterized in that: in step S2, capacitors with different capacities are connected in parallel by 1QF to 3QF, or disconnected according to the branch load, so as to change the total capacitance of the series circuit.
3. The method for safely and quickly finding the fault of the street lamp line according to claim 1, is characterized in that: in step S3, the capacitors with different capacities are adjusted by dividing and combining 1QF and 2QF according to the size of the branch load, so as to change the size of the total capacitance of the series circuit.
4. The method for safely and quickly finding the fault of the street lamp line according to claim 1, is characterized in that: in the step S4, a clamp ammeter is placed at the cable outlet of the power distribution cabinet, and the change of the zero sequence current is checked at any time, so that a hidden fault point which may exist when others turn over the cable when searching for a fault can be found in time.
5. The method for safely and quickly finding the fault of the street lamp line according to claim 1, is characterized in that: respectively connecting capacitors with proper capacity in series in A, B, C three-phase outgoing cables, measuring zero sequence current of the outgoing fault cables in a power distribution cabinet, if the zero sequence current exists, judging that a ground fault point is on an N phase, and adding voltage between any phase A, B, C and the N phase; if the zero-sequence current exists in any phase of A, B, C, the grounding fault point is judged to be on the phase, the voltage is added on the fault phase and the N phase, then the zero-sequence current of the cable A, B, C and the N phase is measured at the lamp post by using a high-precision clamp-on ammeter, and the grounding fault point between two poles or the lamp post leading line can be judged according to the mutation point of the zero-sequence current.
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| CN201811015251.1A CN109188201B (en) | 2018-08-31 | 2018-08-31 | Method for safely and quickly searching street lamp line fault |
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| CN201811015251.1A CN109188201B (en) | 2018-08-31 | 2018-08-31 | Method for safely and quickly searching street lamp line fault |
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| CN109188201B true CN109188201B (en) | 2020-06-26 |
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| CN115575857B (en) * | 2022-12-08 | 2023-04-28 | 江西广凯新能源股份有限公司 | Emergency protection method and device for high-voltage wire breakage |
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| KR101447736B1 (en) * | 2013-05-15 | 2014-10-13 | 정소영 | Streetlights track remote monitoring system and monitoring method with it |
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Effective date of registration: 20220620 Address after: 362299 No. 931, Century Avenue, Meishan community, Meiling street, Jinjiang City, Quanzhou City, Fujian Province Patentee after: JINJIANG YIZHONG LIGHTING DEVELOPMENT Co.,Ltd. Address before: 362200 No. 679, Shiji Avenue, Jinjiang City, Quanzhou City, Fujian Province Patentee before: Zeng Jianzhong |
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