CN111880116A - Low-voltage line load leakage detection device and method - Google Patents

Abstract

The invention discloses a low-voltage line on-load leakage checking device and a method thereof, the device comprises a pincer-shaped ammeter and a leakage detection circuit, the leakage detection circuit comprises a first power connection clamp, a second power connection clamp, a current limiting element, a rectification module and a third power connection clamp, the first power connection clamp and the second power connection clamp are connected through a lead, the current limiting element and the rectification module are connected in series on the lead connected with the first power connection clamp and the third power connection clamp, and the rectification module is set to enable current to be conducted from the first power connection clamp to the third power connection clamp in a single direction. The invention can quickly and accurately diagnose the leakage position, and greatly improves the quick response of the leakage maintenance of the transmission line; the portable multifunctional portable water heater is convenient to carry and simple to operate, the cost of each component of the device is low, the components can be repeatedly used, and the use cost is reduced; the invention does not need to disassemble the transformer, reduces the labor intensity in the inspection process, can inspect the leakage position without power failure, does not influence the power consumption of residents and enterprises in the inspection process, and is convenient for popularization and application.

Description

Low-voltage line load leakage detection device and method

Technical Field

The invention relates to the field of power transmission, in particular to a device and a method for quickly detecting load leakage of a low-voltage line, which are simple to operate.

Background

In the existing power transmission line, in the process of transmitting power to users by the transmission line of the transformer (below 0.4 KV), the phenomenon of electric leakage sometimes occurs, and further, the troubleshooting and maintenance are required by power technicians.

At present, a common leakage detection method is shown in fig. 1, before leakage detection, an outlet terminal A, B, C of a main switch of a distribution box and N four wires must be completely detached, then the four wires are connected together, and then one phase wire is jumped from any one of the front ends of the switches to the three originally detached phase wires, so that a leakage circuit and a grounding flat iron of a transformer form a loop through the ground. And then detecting the overlapped A, B and C three-phase line by using an alternating current gear of the clamp ammeter, then gradually checking each phase until a leakage point is found, and recovering power transmission after searching and repairing.

The technical personnel need to disassemble each phase line of the output end of the main switch of the distribution box, and meanwhile, the A, B and C three-phase lines need to be checked step by step, so that the workload is very large and the safety is not high; particularly, in the process of inspection, power failure processing needs to be performed on residents or factories and enterprises in the electric leakage area, which brings great inconvenience to life of the residents and production and power utilization of the enterprises.

Disclosure of Invention

The invention aims to provide a low-voltage line load leakage detection device and a method which are simple to operate, can quickly detect the leakage position of a power transmission line and can be repeatedly used.

In order to achieve the above object, the present invention first discloses a low-voltage line on-load leakage checking device, which comprises a pincerlike ammeter and a leakage detection circuit, wherein the leakage detection circuit comprises a first power connection clamp, a second power connection clamp, a current limiting element, a rectifying module and a third power connection clamp, the first power connection clamp and the second power connection clamp are connected through a wire, the current limiting element and the rectifying module are connected in series on the wire connected with the first power connection clamp and the third power connection clamp, and the rectifying module is configured to make a current conduct from the first power connection clamp to the third power connection clamp in a single direction.

Furthermore, the first power connection clamp, the second power connection clamp and the third power connection clamp are all crocodile clamps.

Further, the conducting wire is 800-1200mm long and has a cross section of 4-6mm²The annealed copper wire of (1).

Further, the current limiting element is a bulb, and the power of the bulb is 150 and 200W.

Further, the rectifier module is a rectifier diode, and the type of the rectifier diode is 1N 5408.

Furthermore, the clamp ammeter is a manual range alternating current-direct current clamp ammeter.

The invention also discloses a low-voltage line on-load leakage detection method, which comprises the following steps:

s1, clamping the grounding wire of the transformer by using a first power connection clamp, wherein the clamping position is located at the upper end of the screw from the N phase wire to the grounding flat iron;

s2, clamping the grounding flat iron of the transformer by a second power connection clamp;

s3, removing screws at the grounding flat iron, so that the grounding flat iron is separated from the grounding wire of the transformer;

s4, clamping the grounding flat iron of the transformer by using a third power connection clamp, and loosening the second power connection clamp;

and S5, detecting the A, B and C three-phase line of the output end of the transformer by using a direct current gear of the clip-on ammeter, and if the clip-on ammeter has a current display, checking backwards until a leakage point is reached.

Further, in step S3, when the screw at the ground flat iron is removed, an insulating glove is worn.

Further, in step S4, after the second power clip is released, the second power clip is connected to the first power clip.

Compared with the prior art, the invention has the advantages that:

1. the invention can quickly and accurately diagnose the leakage position, and greatly improves the quick response of the leakage maintenance of the transmission line;

2. the invention is convenient to carry and simple to operate, the cost of each component of the device is low, the device can be repeatedly used for many times, and the use cost is reduced;

3. the invention does not need to disassemble the transformer, reduces the labor intensity in the inspection process, can inspect the leakage position without power failure, does not influence the power consumption of residents and enterprises in the inspection process, and is convenient for popularization and application.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of leakage detection under load for a low-voltage line disclosed in the prior art;

FIG. 2 is a schematic structural diagram of a clamp-on leakage tester for a low-voltage line loaded leakage testing device and method according to a preferred embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a low-voltage line loaded leakage detection device according to a preferred embodiment of the present invention;

fig. 4 is a schematic flow chart of a leakage detecting method for a low-voltage line with load according to a preferred embodiment of the invention.

Illustration of the drawings:

1. a first power connection clip; 2. a second power connection clip; 3. a third power connection clip; 4. a bulb; 5. a rectifier diode; 6. a transformer; 7. a clamp-on ammeter; 8. grounding flat iron; 9. leakage current; 10. and (4) screws.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

The invention firstly discloses a low-voltage line load leakage checking device, which comprises a pincerlike ammeter 7 and a leakage detection circuit, wherein the leakage detection circuit comprises a first power connection clamp 1, a second power connection clamp 2, a current limiting element, a rectifying module and a third power connection clamp 3, the first power connection clamp 1 and the second power connection clamp 2 are connected through a lead, the lead connected with the first power connection clamp 1 and the third power connection clamp 3 is provided with the current limiting element and the rectifying module in series, the rectifying module is arranged to enable current to be conducted from the first power connection clamp 1 to the third power connection clamp 3 in a single direction, and the lead is 1000mm long and 6mm sectional area²The annealed copper wire of (1). Through the device, can need not realize one-man operation, investigation under the condition of tearing transformer or block terminal open, reduced the intensity of labour of investigation process, more importantly, can arrange the electric leakage position under the circumstances of not having a power failure, the investigation process can not influence resident and enterprise's power consumption, convenient to popularize and apply.

In this embodiment, first connecing electric clamp 1, second to connect electric clamp 2 and third to connect electric clamp 3 and be the crocodile clip that can bear the heavy current, in case press from both sides tightly the connection back, can release both hands, carry out the electric leakage investigation.

In the embodiment, the current limiting element is the bulb 4, the bulb 4 is 200W, and the use cost is remarkably low compared with other large-resistance current limiting components; and rectifier diode 5 is directly selected for use to the rectifier module, and rectifier diode 5's model is 1N5408, and is same, and relative other types of rectifier circuit module, use cost is showing and is reducing, convenient to popularize and apply.

In this embodiment, the clamp ammeter 7 is a manual range ac/dc clamp ammeter, and specifically, a manual range ac/dc clamp ammeter of the type described in the Binjiang brand BM823 can be used, and an automatic range clamp ammeter is not used, because it is possible to prevent the automatic range clamp ammeter from being automatically switched to an ac current level during measurement, and further, measurement cannot be performed or measurement fails.

Then, the invention discloses a low-voltage line loaded leakage detection method, which is operated to avoid a lightning time period, as shown in fig. 3 and 4, the low-voltage line loaded leakage detection device comprising the scheme comprises the following steps:

s1, clamping the grounding wire of the transformer 6 by using the first power clamp 1, wherein the specific position is the upper end from the N phase line to the screw 10 of the grounding flat iron 8;

s2, clamping the grounding flat iron 8 of the transformer 6 by the second grounding clamp 2, so that the grounding circuit of the transformer 6 is positioned between the second grounding clamp 2 and the first grounding clamp 1 to be short-circuited, and the transformer 6 is ensured to be kept in a grounding safe state when the screw 10 at the grounding flat iron 8 is removed;

s3, removing the screw 10 at the position of the grounding flat iron 8, so as to separate the grounding flat iron 8 from the grounding wire of the transformer 6, and grounding the transformer 6 through the first grounding clamp 1, the second grounding clamp 2 and the conducting wires between the first grounding clamp and the second grounding clamp;

s4, clamping the grounding flat iron 8 of the transformer 6 by the third electricity-connecting clamp 3, and loosening the second electricity-connecting clamp 2, so that the transformer 6 forms a direct current conductive loop with a leakage point after being grounded through the bulb 4 and the rectifier diode 5;

s5, the direct current gear of the clamp ammeter 7 is used for detecting the A, B and C three-phase line at the output end of the transformer 6, if the clamp ammeter 7 has current display, the phase line has electric leakage (the leakage detection circuit and the leakage position are formed with leakage current 9 through the ground), so that the phase line with the electric leakage can be judged quickly, and then the phase line is checked backwards until the leakage point, so that the leakage position can be found simply and quickly, and the screw 10 for installing the grounding flat iron 8 is recovered after the checking is finished.

In this embodiment, in step S3, after removing the screws 10 on the grounding flat iron 8, the insulating gloves are worn to prevent the leakage of electricity from the transformer 6 and the electric shock of the technician.

In the present embodiment, in step S4, after the second power receiving clip 2 is released, the second power receiving clip 2 is connected to the first power receiving clip 1, so that the wire between the second power receiving clip 2 and the first power receiving clip 1 is short-circuited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a low-voltage line load leakage detection device, characterized in that, includes pincerlike ampere meter (7) and electric leakage detection circuit, electric leakage detection circuit includes first electricity clamp (1), second electricity clamp (2), current limiting element, rectifier module and third electricity clamp (3) that connects, first electricity clamp (1) and second electricity clamp (2) are connected through the wire, current limiting element and rectifier module establish ties on the wire that first electricity clamp (1) and third electricity clamp (3) are connected, rectifier module sets up to make the electric current follow first electricity clamp (1) connects third electricity clamp (3) unidirectional conduction.

2. The low-voltage line loaded leakage detection device according to claim 1, wherein the first (1), second (2) and third (3) electrical connection clamps are all crocodile clamps.

3. The low-voltage line on-load leakage inspection device as claimed in claim 1, wherein the conductive line is 800-1200mm long and has a cross-sectional area of 4-6mm²The annealed copper wire of (1).

4. The low-voltage line on-load leakage inspection device as claimed in claim 1, wherein the current limiting element is a lamp (4), and the power of the lamp (4) is 150-200W.

5. The low-voltage line loaded leakage detection device according to claim 1, wherein the rectifying module is a rectifying diode (5), and the type of the rectifying diode (5) is 1N 5408.

6. The low-voltage line loaded leakage detection device according to claim 1, wherein the clamp ammeter (7) is a manual range ac/dc clamp ammeter.

7. A low-voltage line on-load leakage detection method comprising the low-voltage line on-load leakage detection device as claimed in any one of claims 1 to 5, comprising the steps of:

s1, clamping the grounding wire of the transformer (6) by using the first electric clamp (1), and clamping the upper end of the screw (10) positioned from the N phase line to the grounding flat iron (8);

s2, clamping the grounding flat iron (8) of the transformer (6) by using the second electric clamp (2);

s3, removing the screw (10) at the grounding flat iron (8), so that the grounding flat iron (8) is separated from the grounding wire of the transformer (6);

s4, clamping the grounding flat iron (8) of the transformer (6) by using the third power connection clamp (3), and loosening the second power connection clamp (2);

and S5, detecting the A, B and C three-phase line of the output end of the transformer (6) by using the direct current gear of the clamp ammeter (7), and if the clamp ammeter (7) has current display, checking backwards until a leakage point is reached.

8. The low-voltage line loaded leakage testing method according to claim 7, wherein in step S3, the insulating gloves are worn while removing the screws (10) at the grounding flat iron (8).

9. The low-voltage line loaded leakage detection method according to claim 7, wherein in step S4, after the second clamp (2) is released, the second clamp (2) is connected to the first clamp (1).

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