Detection device for electric leakage of low-voltage transformer area

Abstract

The invention provides a detection device for electric leakage of a low-voltage transformer area, and the device comprises a first controller which is disposed in a signal transmitting device, and is used for transmitting a first characteristic signal to a first position of a to-be-detected line according to a received electric leakage detection instruction; wherein the first characteristic signal is transmitted through the signal transmitting equipment, and is used for positioning a fault position; the second controller is arranged in the signal receiving device and is used for receiving a second characteristic signal corresponding to the first characteristic signal at a second position of the to-be-detected line; wherein the second characteristic signal is received by the signal receiving device and is used for determining an electric leakage fault of the line to be detected; and the first controller is also used for determining whether the to-be-detected line has an electric leakage fault or not according to the receiving condition of the second characteristic signal. According to the invention, through signal emission and signal reception, the technical problem of low detection efficiency of an existing low-voltage transformer area electric leakage detection method is solved, and the electric leakage detection efficiency of the low-voltage transformer area is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage platform leakage detection, and in particular to a low-voltage platform leakage detection device. Background Art

[0002] As various household appliances enter the homes of urban residents in large numbers, the demand for electricity is growing day by day, causing some of the already built low-voltage lines to have an unbalanced load development due to disorderly increase in load; or because the zero line diameter is too small in the design; or because of inadequate operation and maintenance, the low-voltage line has fallen into disrepair, etc., which eventually leads to the zero line being overloaded and burned out, or the load imbalance causing the zero line to be energized. After the zero line is energized due to various reasons, it is difficult for the power supply department to find defects and faults during normal operation and maintenance. The time to find and troubleshoot the fault varies depending on personal experience and business skills. In particular, those who lack experience often take a long time to find the cause of the fault. Summary of the invention

[0003] The purpose of the present invention is to provide a device for detecting leakage in low-voltage areas, so as to solve the technical problem of how to improve the efficiency of leakage detection in low-voltage areas.

[0004] On the one hand, a device for detecting leakage in a low-voltage area is provided, comprising:

[0005] A first controller is provided in the signal transmitting equipment, and is used to send a first characteristic signal to a first position of the line to be tested according to a received leakage detection instruction; wherein the first characteristic signal is sent by the signal transmitting equipment and is used to locate the fault position;

[0006] A second controller is provided in the signal receiving device, and is used to receive a second characteristic signal corresponding to the first characteristic signal at a second position of the circuit to be tested; wherein the second characteristic signal is received by the signal receiving device and is used to determine a leakage fault of the circuit to be tested;

[0007] The first controller is further used to determine whether there is a leakage fault in the line to be tested according to the reception status of the second characteristic signal.

[0008] Preferably, the preset signal transmitting equipment is connected to the line to be tested through a test line, forming a loop between the signal transmitting equipment, the leakage fault location in the line to be tested and the earth, and sends a first characteristic signal to the line to be tested when working in a power grid outage state.

[0009] Preferably, the preset signal receiving device is preset in the circuit to be tested, and is used to determine the leakage fault position according to the reception status of the second characteristic signal.

[0010] Preferably, the first controller is further used to disconnect the path between the line to be tested and the power grid when receiving the leakage detection instruction and before sending the first characteristic signal to the line to be tested.

[0011] Preferably, the first controller is further used to determine that a leakage fault exists in the circuit to be tested, and the leakage fault position is between the signal transmitting equipment and a preset position, if the signal receiving device detects a second characteristic signal.

[0012] Preferably, the first controller is also used to, if the signal receiving device cannot detect the second characteristic signal, detect the current vector of the circuit to be tested through the differential current sensor in the signal transmitting equipment; if the detected current vector meets the preset fault range, it is determined that there is a leakage fault in the circuit to be tested.

[0013] Preferably, the differential current sensor is electrically connected to the first controller, and is used to detect the four-phase current vector of the circuit to be tested, and measure the online leakage current and the daily average leakage current value in real time.

[0014] Preferably, the first controller is also used to, when a leakage fault exists in the circuit to be tested, adjust the second position close to the first position until the difference between the first characteristic signal and the second characteristic signal meets the preset fault signal characteristic, determine the location of the leakage fault, and output an alarm signal.

[0015] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0016] The present invention provides a device for detecting leakage in a low-voltage area, which receives a second characteristic signal corresponding to a first characteristic signal at a second position of the circuit to be tested through a signal receiving device; based on the second characteristic signal, it determines whether there is a leakage fault in the circuit to be tested, and through signal transmission and signal reception, it alleviates the technical problem of low detection efficiency of the existing low-voltage area leakage detection method, thereby improving the low-voltage area leakage detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0018] Figure 1 It is a schematic diagram of a device for detecting leakage in a low-voltage area according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 FIG. 1 is a schematic diagram of an embodiment of a detection device for low voltage area leakage provided by the present invention. In this embodiment, it includes:

[0021] The first controller is arranged in the signal transmitting equipment, and is used to send a first characteristic signal to the first position of the line to be tested according to the received leakage detection instruction; wherein the first characteristic signal is sent by the signal transmitting equipment and is used to locate the fault position; the second controller is arranged in the signal receiving device, and is used to receive a second characteristic signal corresponding to the first characteristic signal at the second position of the line to be tested; wherein the second characteristic signal is received by the signal receiving device and is used to determine the leakage fault of the line to be tested; the first controller is also used to determine whether the line to be tested has a leakage fault according to the reception of the second characteristic signal. It can be understood that the first controller is arranged in the signal transmitting equipment and the second controller is arranged in the signal receiving device; the first controller is used to receive the leakage detection instruction of the user and control the signal transmitting equipment to send the first characteristic signal to the first position of the line to be tested; the second controller is used to control the above-mentioned signal receiving device to receive the second characteristic signal corresponding to the first characteristic signal at the second position of the line to be tested; the first controller is also used to determine whether the above-mentioned line to be tested has a leakage fault according to the above-mentioned first characteristic signal and the above-mentioned second characteristic signal. The above-mentioned signal transmitting equipment is the host of the low-voltage leakage locator. The low-voltage leakage locator needs to work in the state of power grid outage. The host of the low-voltage leakage locator is connected to the line to be tested through a test line, so that a loop is formed between the host of the low-voltage leakage locator and the leakage fault position in the line to be tested to the ground and the host of the low-voltage leakage locator. The host of the low-voltage leakage locator sends a first characteristic signal to the fault line. The signal receiving device is the slave of the low-voltage leakage locator. The slave detects the characteristic signal. The slave can detect the second characteristic signal before the preset position of the leakage fault position. The receiving slave cannot detect the second characteristic signal after the leakage fault point, so as to realize the location of the leakage fault position of the faulty line.

[0022] In one embodiment, the device further comprises a power supply connected to the first controller, the second controller, the signal transmitting device and the signal receiving device; the power supply is used to power the first controller, the second controller, the signal transmitting device and the signal receiving device. A human-computer interaction interface connected to the first controller; the first controller is also used to control the human-computer interaction interface to display the leakage fault. The human-computer interaction interface is provided with an interactive control; the first controller is also used to determine the leakage fault level and the fault location of the leakage fault according to the first characteristic signal and the second characteristic signal; the interactive control is used to display the leakage fault level and the fault location after receiving the user's operation instruction. A memory connected to the first controller; the memory is used to store the leakage fault level and the fault location. An alarm device connected to the first controller; the first controller is also used to generate a warning signal when it is determined that there is a leakage fault in the circuit to be tested; the alarm device is used to respond to the warning signal and alarm. The alarm device includes a buzzer and an LED of a specified color.

[0023] In one embodiment, the preset signal transmitting equipment is connected to the line to be tested through a test line, forming a loop between the signal transmitting equipment, the leakage fault position in the line to be tested and the earth, and sends a first characteristic signal to the line to be tested when the power grid is shut down. The preset signal receiving device is preset in the line to be tested, and is used to determine the leakage fault position according to the reception of the second characteristic signal.

[0024] In one embodiment, the first controller is further configured to disconnect the path between the line to be tested and the power grid when receiving a leakage detection instruction and before sending a first characteristic signal to the line to be tested.

[0025] In one embodiment, the first controller is further used to determine that a leakage fault exists in the line to be tested, and the leakage fault position is between the signal transmitting equipment and a preset position, if the signal receiving device detects a second characteristic signal.

[0026] In one embodiment, the first controller is also used to detect the current vector of the circuit to be tested through the differential current sensor in the signal transmitting equipment if the signal receiving device cannot detect the second characteristic signal; if the detected current vector meets the preset fault range, it is determined that the circuit to be tested has a leakage fault. The differential current sensor detects the four-phase current vector of the circuit to be tested, and measures the online leakage current and the daily average leakage value in real time. It is understandable that if the above leakage fault is not detected, the current vector of the circuit to be tested is detected through the differential current sensor in the signal transmitting equipment; according to the current vector, it is determined whether the circuit to be tested has a leakage fault. The differential current sensor is a Rogowski coil. Before the step of detecting the current vector of the circuit to be tested through the differential current sensor in the signal transmitting equipment, the method includes: connecting the Rogowski coil to the A phase, B phase, C phase and N phase of the circuit to be tested. The Rogowski coil is placed on the A phase, B phase, C phase and N phase of the circuit to be tested, and the blue-black banana plug of the Rogowski coil is inserted into the corresponding color jack of the host. Select the leakage assessment function, the host detects the four-phase current vector and situation, and measures the online leakage current and daily average leakage value in real time.

[0027] In an embodiment, the first controller is also used to, when a leakage fault exists in the circuit to be tested, adjust the second position close to the first position until the difference between the first characteristic signal and the second characteristic signal meets the preset fault signal characteristics, determine the location of the leakage fault, and output an alarm signal. It is understandable that if a leakage fault exists in the circuit to be tested, adjust the second position to bring the second position close to the first position until the location of the leakage fault is determined based on the first characteristic signal and the second characteristic signal. The types of the first characteristic signal and the second characteristic signal are both voltage signals; the location of the leakage fault is determined based on the difference between the first characteristic signal and the second characteristic signal. When the location of the leakage fault is determined, a preset alarm signal is sent out by the alarm device of the signal transmitting equipment. The alarm device includes: a buzzer and an LED light, and the location of the leakage fault is displayed on a display.

[0028] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0029] The present invention provides a method and device for detecting leakage in a low-voltage substation, which receives a second characteristic signal corresponding to a first characteristic signal at a second position of the circuit to be tested through a signal receiving device; based on the second characteristic signal, it is determined whether there is a leakage fault in the circuit to be tested, and through signal transmission and signal reception, the technical problem of low detection efficiency of the existing low-voltage substation leakage detection method is alleviated, thereby improving the leakage detection efficiency of the low-voltage substation.

[0030] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A device for detecting leakage in low voltage areas, characterized in that: include, A first controller is provided in the signal transmitting equipment, and is used to send a first characteristic signal to a first position of the line to be tested according to a received leakage detection instruction; wherein the first characteristic signal is sent by the signal transmitting equipment and is used to locate the fault position; A second controller is provided in the signal receiving device, and is used to receive a second characteristic signal corresponding to the first characteristic signal at a second position of the circuit to be tested; wherein the second characteristic signal is received by the signal receiving device and is used to determine a leakage fault of the circuit to be tested; The first controller is further used to determine whether there is a leakage fault in the line to be tested according to the reception status of the second characteristic signal.

2. The device according to claim 1, characterized in that The preset signal transmitting equipment is connected to the line to be tested through a test line, forming a loop between the signal transmitting equipment, the leakage fault position in the line to be tested and the earth, and sends a first characteristic signal to the line to be tested when working in a power grid outage state.

3. The device according to claim 2, characterized in that The preset signal receiving device is preset in the circuit to be tested, and is used to determine the leakage fault position according to the reception condition of the second characteristic signal.

4. The device according to claim 1, characterized in that The first controller is further configured to disconnect the path between the line to be tested and the power grid upon receiving a leakage detection instruction and before sending a first characteristic signal to the line to be tested.

5. The device according to claim 4, characterized in that The first controller is also used to determine that a leakage fault exists in the circuit to be tested, and the leakage fault position is between the signal transmitting equipment and a preset position, if the signal receiving device detects a second characteristic signal.

6. The device according to claim 5, characterized in that The first controller is further configured to detect the current vector of the circuit to be tested by a differential current sensor in the signal transmitting equipment if the signal receiving device cannot detect the second characteristic signal; If the detected current vector meets the preset fault range, it is determined that the circuit to be tested has a leakage fault.

7. The device according to claim 6, characterized in that The differential current sensor is electrically connected to the first controller, and is used to detect the four-phase current vector of the circuit to be tested, and measure the online leakage current and the daily average leakage value in real time.

8. The device according to claim 6, characterized in that The first controller is also used to, when a leakage fault exists in the circuit to be tested, adjust the second position close to the first position until the difference between the first characteristic signal and the second characteristic signal meets the preset fault signal characteristic, determine the location of the leakage fault, and output an alarm signal.

Images