CN204347187U - The pick-up unit of leak current fault and system - Google Patents

Abstract

The utility model discloses a leakage fault detection device and system, comprising: an acquisition module, used to acquire the current voltage value between each of the three-phase lines of the power transmission line and the ground; a detection module, used to detect the three-phase Whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than the predetermined threshold in the line; the marking module is used to detect whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than the predetermined threshold in the three-phase line When the phase wire is detected, mark the detected phase wire as the phase wire with leakage fault. In the embodiment of the utility model, the phase line with a leakage fault can be detected through the voltage drop on the phase line of the power transmission line, without the need to pick the phases of the three phases in the power transmission line phase by phase, thereby solving the problem in the related art The technical problem of low leakage fault detection efficiency improves the detection efficiency of leakage faults.

Description

Leakage fault detection device and system

technical field

The utility model relates to the field of electric power technology, in particular to a leakage fault detection device and system.

Background technique

During the operation of low-voltage lines, it is often encountered that the leakage switch of the line is tripped due to the failure of the user's electrical equipment. In the fault finding, in order to narrow the search range, the method of phase-by-phase picking and trial delivery is usually adopted to determine the faulty phase, and then the fault point is searched for the faulty phase.

However, using the above method not only takes a long time to search and is inefficient, but also has a strong impact on the user's electrical equipment due to repeated trial delivery.

At present, no effective solution has been proposed for the above technical problems.

Utility model content

The embodiment of the utility model provides a leakage fault detection device and system to at least solve the technical problem of low detection efficiency of leakage faults in the related art.

According to an aspect of an embodiment of the present invention, a leakage fault detection device is provided, including: an acquisition module connected to the three-phase lines of the power transmission line The current voltage value between each and the ground; a detection module, connected to the acquisition module, used to detect whether there is a difference between the current voltage value and the normal voltage value greater than a predetermined threshold in the three-phase line Phase line, wherein, the normal voltage value is the voltage value between the phase line and the ground when no leakage fault occurs in the phase line; the marking module is connected with the detection module for When there is a phase line whose difference between the current voltage value and the normal voltage value is greater than the predetermined threshold, the detected phase line is marked as a phase line with a leakage fault.

Optionally, the acquisition module includes: a voltage detection component, arranged between each of the three-phase lines and the ground, and configured to acquire the current voltage value.

Optionally, the acquiring module further includes: a sending unit connected to the voltage detecting component, configured to send a voltage acquiring request to the voltage detecting component; a receiving unit connected to the voltage detecting component, configured to receive the The current voltage value returned by the voltage detection component.

Optionally, the voltage detection component includes: a voltmeter.

Optionally, the output ends of the voltmeters on the three-phase lines are connected together and grounded.

Optionally, the marking module includes: an indicator light, which is used to indicate the phase line marked as having an electric leakage fault.

Optionally, the marking module further includes: an audio alarm, which is used to indicate the phase wire with an electric leakage fault by sending out an audio alarm signal.

According to another aspect of the embodiment of the present utility model, a leakage fault detection system includes the device described in any one of the above, and is used for leakage fault detection of a low-voltage distribution network.

The embodiments of the above-mentioned utility model can achieve the following beneficial effects:

In the embodiment of the present invention, the phase line with leakage fault can be detected through the voltage drop on the above-mentioned phase line, without the need to pick the phases of the three phases in the power transmission line, so as to solve the problem of leakage in the related art. The technical problem of low fault detection efficiency improves the detection efficiency of leakage faults.

Description of drawings

The drawings described here are used to provide a further understanding of the utility model and constitute a part of the application. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is a structural block diagram of an optional leakage fault detection device according to this embodiment of the utility model;

Fig. 2 is a detection flow chart of an optional leakage fault according to an embodiment of the present invention;

FIG. 3 is a structural diagram of an optional detection circuit according to an embodiment of the present invention;

Fig. 4 is a structural block diagram of another optional leakage fault detection device according to this embodiment of the present invention;

Fig. 5 is a flow chart of another optional leakage fault detection according to this embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

Example 1:

Fig. 1 is a structural block diagram of an optional leakage fault detection device according to this embodiment of the present invention.

As shown in Figure 1, optionally, it includes: an acquisition module 1, which is respectively connected to the three-phase lines of the power transmission line, and is used to acquire the current voltage value between each of the three-phase lines of the power transmission line and the ground; a detection module 2. Connected to the acquisition module 1, used to detect whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold in the three-phase line according to the acquired current voltage value, wherein the normal voltage value is a phase line The voltage value between the phase line and the ground when there is no leakage fault; the marking module 3 is connected to the detection module 2, and is used to detect that the difference between the current voltage value and the normal voltage value in the three-phase line is greater than the predetermined Threshold phases are marked as phases with leakage faults.

Fig. 2 is a flow chart of an optional leakage fault detection according to an embodiment of the present invention. As shown in Figure 2, including:

S102: Obtain the current voltage value between each of the three-phase lines of the power transmission line and the ground;

S104: Detect whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold in the three-phase line, wherein the normal voltage value is the phase line between the phase line and the ground when no leakage fault occurs on the phase line Voltage value;

S106: If there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold among the three-phase lines, mark the detected phase line as a phase line with a leakage fault.

For example, the normal voltage value is 220 (V), and the predetermined threshold value is 4 (V). Assuming that the voltage of the a-phase line in the three-phase lines detected by the voltmeter 11 is 210 (V), like this, the difference between the voltage of the a-phase line and the normal voltage value is 10 (V), which is greater than the predetermined threshold, thus It is judged that phase a of the three-phase lines has a leakage fault, and the phase a of the three-phase lines is marked as a phase line with a leakage fault.

The above judgment method is also applicable to the b-phase line and the c-phase line among the three-phase lines.

It should be noted that the above predetermined threshold is 4 (V), which is just an example, and is not limited in this embodiment.

Optionally, in addition to the voltage drop on the phase line, other factors may also be combined to determine whether a leakage fault occurs on the phase line, wherein the other factors may be but not limited to the ground current of the phase line. For example, if it is satisfied that the ground current is above 800mA and the voltage drop reaches 4V or above, the phase wire can be determined as the phase wire of the leakage fault.

In this embodiment, the current voltage value between each of the three-phase lines of the power transmission line and the ground is obtained in real time through the corresponding acquisition module 1 connected to each phase of the three-phase lines of the low-voltage distribution network; the detection module 2. Connected to the acquisition module 1, used to detect whether there is a phase line whose difference between the current voltage value and the normal voltage value is greater than a predetermined threshold value among the three-phase lines according to the acquired current voltage value. When a ground fault occurs in a certain phase of the power transmission line, while the ground current is generated, the voltage on the corresponding phase line drops. By detecting the current voltage value, it is detected whether there is a difference between the current voltage value and the normal voltage value in the three-phase line. A phase line greater than a predetermined threshold can be obtained as a faulty phase line. Under normal circumstances, the phase line that satisfies the grounding current of 800mA or more and the voltage drop of 4V or more can be determined as the leakage fault phase line. The leakage fault detection method of this embodiment can not only improve the detection efficiency of leakage faults, but also avoid the impact on electrical equipment caused by the phase-by-phase picking and testing method adopted in the related art to determine the fault phase.

Example 2:

Fig. 3 is an optional detection circuit structure diagram according to an embodiment of the present invention; as shown in Fig. 3, the acquisition module 1 includes: a voltage detection component, which is arranged between each of the three-phase lines and the ground , used to obtain the current voltage value. Optionally, the voltage detection component includes: a voltmeter 11 . Through the corresponding voltage detection component voltmeter 11 connected to each phase of the three-phase line of the low-voltage distribution network, the neutral terminals of the three voltmeters 11 on the three-phase line are connected together and grounded. Real-time monitoring of the voltage change between each phase of the three-phase line and the ground. When a ground fault occurs in a certain phase of the power transmission line, while the ground current is generated, the voltage on the corresponding phase line drops, and the change of the corresponding voltage can be monitored. A faulty phase conductor was detected.

Fig. 4 is a structural block diagram of another optional leakage fault detection device according to this embodiment of the utility model.

As shown in Figure 4, optionally, the acquisition module 1 also includes: a sending unit 12, connected to the voltage detection component voltmeter 11, for sending a voltage acquisition request to the voltage detection component; a receiving unit 13, connected to the voltage detection component voltmeter 11 is connected to receive the current voltage value returned by the voltage detection component.

Fig. 5 is a flow chart of another optional leakage fault detection according to this embodiment of the present invention. As shown in Figure 5, including:

S202: Send a voltage acquisition request to the voltage detection component through the sending unit 12;

S204: Receive the current voltage value returned by the voltage detection component through the receiving unit 13 .

In order to facilitate the detection personnel to quickly grasp the phase wires with ground faults, optionally, the marking module 3 includes: an indicator light 31 for indicating the phase wires marked by the marking module 3 as having leakage faults. The marking module 3 also includes: an audio alarm device 32, which is used to mark the phase line where the leakage fault occurs by sending out an audio alarm signal. When a leakage fault occurs in the corresponding phase line, the faulty phase line can be identified by lighting the indicator light 31 corresponding to the phase line marked as the leakage fault or by sending an audio sound through the corresponding audio alarm, so that the inspector can intuitively and quickly Grasp the faulty phase line in the power transmission line.

For example, the voltage detection part voltmeter 11 of the a-phase line, b-phase line and c-phase line of the power transmission line of the sending unit 12 all sends a voltage acquisition request, and the voltmeter 11 returns the current voltage acquired in real time to the receiving unit 13, so Said unit 13 transmits the current voltage value received by each phase line to the detection module 2, assuming that the voltages of the a-phase line and the c-phase line in the three-phase lines detected by the voltmeter 11 are respectively 218 (V) and 212 ( V), so that the difference between the voltage of the a-phase line and the normal voltage value is 2 (V), within the predetermined threshold range, and the difference between the voltage of the c-phase line and the normal voltage value is 8 (V ), exceeds the predetermined threshold range, so that it is judged that a leakage fault occurs in the c-phase line of the three-phase lines, and the c-phase line in the three-phase lines is marked as a phase line with a leakage fault.

The detection of leakage faults in this embodiment can not only improve the detection efficiency of leakage faults, but also avoid the impact on electrical equipment caused by the phase-by-phase picking and test delivery method adopted in the related art to determine the fault phase, and at the same time in the actual detection of leakage faults In the process, the inspector can intuitively and quickly grasp the faulty phase line in the power transmission line, so as to realize the rapid processing of the fault.

The embodiment of the utility model also provides a leakage fault detection system, which includes the device described in any one of the above, and is used for leakage fault detection of a low-voltage power grid.

The serial numbers of the above-mentioned embodiments of the utility model are only for description, and do not represent the advantages and disadvantages of the embodiments.

In the above-mentioned embodiments of the present invention, the descriptions of each embodiment have their own emphases, and for the parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (8)

1. a pick-up unit for leak current fault, is characterized in that, comprising:

Acquisition module, is connected respectively with the triple-phase line of power transmission line, for obtaining the current voltage value between each and the ground in the triple-phase line of described power transmission line;

Detection module, be connected with described acquisition module, the phase line of predetermined threshold is greater than for detecting the difference whether existed between described current voltage value and normal voltage value in described triple-phase line, wherein, described normal voltage value is the magnitude of voltage of described phase line when there is not leak current fault between described phase line and described ground;

Mark module, be connected with described detection module, when being greater than the described phase line of described predetermined threshold for the difference existed between described current voltage value and described normal voltage value in described triple-phase line, the described phase line detected is labeled as the phase line occurring leak current fault.

2. device according to claim 1, is characterized in that, described acquisition module comprises:

Voltage check part, is arranged between each and the described ground in described triple-phase line, for obtaining described current voltage value.

3. device according to claim 2, is characterized in that, described acquisition module also comprises:

Transmitting element, is connected with described voltage check part, obtains request for sending voltage to described voltage check part;

Receiving element, is connected with described voltage check part, for receiving the described current voltage value that described voltage check part returns.

4. the device according to Claims 2 or 3, is characterized in that, described voltage check part comprises: voltage table.

5. device according to claim 4, is characterized in that, the voltage table output terminal in described triple-phase line links together and ground connection.

6. device according to any one of claim 1 to 3, is characterized in that, described mark module comprises:

Pilot lamp, is labeled as the phase line occurring leak current fault described in being used to indicate.

7. device according to any one of claim 1 to 3, is characterized in that, described mark module also comprises:

Audio alarm, for by sending audio alarming signal, indicates the phase line occurring leak current fault.

8. a detection system for leak current fault, is characterized in that, comprises the device according to any one of claim 1,2,3 or 5, and the leak current fault for low-voltage network detects.