WO2018201593A1

WO2018201593A1 - Leakage overvoltage test circuit, leakage overvoltage tester and test method

Info

Publication number: WO2018201593A1
Application number: PCT/CN2017/090056
Authority: WO
Inventors: 马健; 马骥
Original assignee: 中领世能（天津）科技有限公司
Priority date: 2017-05-04
Filing date: 2017-06-26
Publication date: 2018-11-08
Also published as: CN107015100A

Abstract

A leakage overvoltage test circuit and a leakage overvoltage tester, relating to the technical field of leakage detection. The leakage overvoltage test circuit comprises: a transformer circuit (11), a rectifier filter circuit (12), a comparison circuit (13), an output circuit (14), and a voltmeter. The transformer circuit is used for transforming a leakage voltage and outputting the transformed leakage voltage to the rectifier filter circuit. The rectifier filter circuit is used for rectifying and filtering the transformed leakage voltage. The comparison circuit is used for comparing the rectified and filtered leakage voltage with a reference voltage, and outputting a comparison result to the output circuit. The output circuit displays the comparison result. The voltmeter is disposed at an input end of the transformer circuit, the rectifier filter circuit, the comparison circuit or the output circuit. The invention solves the problem in the prior art that there is no way to simultaneously determine if a current leakage voltage is an overvoltage and the type of leakage, and achieves the technical effect of automatically indicating that an active leakage voltage is an overvoltage.

Description

Leakage overvoltage test circuit, leakage overvoltage tester and test method

Cross-reference to related applications

This application claims priority to Chinese Patent Application No. CN201710306652.1, entitled "Leakage Overvoltage Test Circuit and Leakage Overvoltage Tester", submitted to the Chinese Patent Office on May 4, 2017, the entire contents of which are hereby incorporated by reference. Combined in this application.

Technical field

The invention relates to the technical field of leakage detection, in particular to a leakage overvoltage test circuit, a leakage overvoltage tester and a test method.

Background technique

In the process of repairing the transmission line or electrical equipment, when a ground leakage occurs, the leakage line forms a loop with the ground, and at the same time, a voltage is generated and a current flows. This voltage can drive the electrical equipment to work, which is similar to the use of the power supply voltage. Usually this voltage is called the active voltage. It can be measured with a voltmeter or a multimeter.

However, not all voltages measured by voltmeters or multimeters can drive electrical equipment to work, so that electrical equipment works, that is, the voltage measured by a voltmeter or multimeter may not have load capacity, usually this kind of work can not be done. The voltage is called the reactive voltage. This voltage will not drive the load and will not cause harm to people.

However, when leakage occurs, the prior art cannot simultaneously give the type of leakage, and whether the current leakage voltage is overvoltage. The type of leakage refers to the active voltage and the reactive voltage, which often causes maintenance personnel to perform unnecessary maintenance, or cannot Reasonably arrange the maintenance order according to the priority of the emergency, and the inspection efficiency is low.

Summary of the invention

In view of the above, an object of the present invention is to provide a leakage overvoltage test circuit, a leakage overvoltage tester, and a test method, so as to solve the problem that the leakage detection device existing in the prior art cannot simultaneously provide a leakage voltage, and leakage. Type of technical issue.

In a first aspect, an embodiment of the present invention provides a leakage overvoltage test circuit, including: a transformer circuit, a rectifier filter circuit, a comparison circuit, an output circuit, and a voltmeter;

The transformer circuit is used for transforming the leakage voltage and outputting to the rectifier filter circuit;

The rectifying and filtering circuit is used for rectifying and filtering the leakage voltage after the voltage transformation;

The comparison circuit is configured to compare the rectified and filtered leakage voltage with a reference voltage, and output the comparison result to the output circuit;

The output circuit displays the comparison result;

The voltmeter is disposed at an input end of the transformer circuit, the rectifier filter circuit, the comparison circuit, or the output circuit.

In conjunction with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the leakage overvoltage test circuit further includes a gear selection circuit, and the leakage voltage is input to the variable after the gear selection circuit Pressure circuit.

In conjunction with the first aspect, an embodiment of the present invention provides a second possible implementation of the first aspect, wherein the input of the gear selection circuit is further connected with a fuse.

Optionally, the voltmeter is coupled to an input of the gear selection circuit.

Optionally, the transformer circuit includes a primary induction coil, a core, and a secondary induction coil;

The gear selection circuit includes a plurality of gear switches, and the different gear switches are connected to different positions of the primary induction coil according to different voltage values.

With reference to the first aspect, the embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the gear voltage of the gear selection circuit includes: 2V, 127V, 220V, 380V, 660V, 1140V. And 1250V.

With reference to the first aspect, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the rectifying and filtering circuit comprises a bridge rectifying circuit, and a π-type filtering circuit connected in series with the bridge rectifying circuit, and the π-type The filter circuit is connected to the comparison circuit;

The bridge rectifier circuit is configured to perform full-wave rectification on the leakage voltage, and the π-type filter circuit is configured to filter the full-wave rectified leakage voltage, and output the rectified and filtered leakage voltage to the comparison circuit.

In conjunction with the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the leakage overvoltage test circuit further includes an alarm, and the output circuit displays the comparison result by using an alarm, and the alarm presets There are several alarm sounds;

The output circuit is configured to classify the comparison results and to align the classified comparison results with the alarm sounds.

With reference to the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein when the leakage voltage is an active voltage, and the rectified and filtered leakage voltage is greater than or equal to the reference voltage, the alarm output First alarm sound;

When the rectified and filtered leakage voltage is less than the reference voltage, the alarm outputs a second alarm sound.

In conjunction with the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the alarm is in an inactive state when the leakage voltage is a reactive voltage.

In conjunction with the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, wherein the output circuit further includes an indicator light, and the state of the indicator light corresponds to an alarm sound of the alarm.

Optionally, the leakage overvoltage test circuit further includes a reference voltage input circuit;

The reference voltage input circuit is configured to receive a reference voltage manually input by a user and transmit the same To the comparison circuit.

In a second aspect, an embodiment of the present invention provides a leakage overvoltage tester, including the leakage overvoltage test circuit of the first aspect and its possible embodiments.

Optionally, the leakage overvoltage tester further includes a display screen;

The display screen is configured to display a leakage voltage output by the leakage overvoltage test circuit.

In a third aspect, an embodiment of the present invention further provides a leakage overvoltage test method, which is applied to the above leakage overvoltage test circuit, and the method includes:

The transformer circuit converts the leakage voltage and outputs it to the rectifier filter circuit;

The rectifying and filtering circuit rectifies and filters the voltage leakage voltage after the voltage transformation and outputs the same to the comparison circuit;

The comparison circuit compares the rectified and filtered leakage voltage with a reference voltage, and outputs the comparison result to the output circuit;

The output circuit displays the comparison result;

The voltmeter detects and displays the leakage voltage.

Optionally, the reference voltages of the leakage voltages of different gears are the same voltage value.

Optionally, the leakage voltages of different gears are configured with reference voltages of different voltage values.

Optionally, the method further includes:

When the leakage voltage is the active voltage, if the rectified and filtered leakage voltage is greater than or equal to the reference voltage, the alarm sound of the control alarm is the first alarm sound, and the control indicator shows the first color; if the rectified and filtered leakage voltage If it is less than the reference voltage, the control alarm outputs a second alarm sound, and the control indicator displays a second color;

When the leakage voltage is reactive voltage, the control alarm is in a non-working state, the control indicator is in a non-operating state, and the voltmeter displays the leakage voltage value;

When the transmission line or electrical equipment has no leakage, the control alarm and indicator light are in non-working state. The voltmeter has no voltage value.

The embodiments of the present invention bring the following beneficial effects:

The leakage overvoltage test circuit, the leakage overvoltage tester and the test method provided by the embodiment of the invention transform the leakage voltage through the transformer circuit and output to the rectifier filter circuit; the rectifier voltage is rectified by the rectifier filter circuit Filtering; comparing the rectified and filtered leakage voltage with the reference voltage through a comparison circuit, and outputting the comparison result to the output circuit; finally, the output circuit displays the comparison result. Corresponding display according to the comparison results, both the leakage type and the overvoltage display of the active voltage are provided, which facilitates the leakage detection and maintenance of the transmission network and electrical equipment.

Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention are realized and attained by the invention particularly pointed in

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

DRAWINGS

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the specific embodiments or the description of the prior art will be briefly described below, and obviously, the attached in the following description The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a schematic diagram of a leakage overvoltage test circuit according to Embodiment 1 of the present invention;

2 is a schematic diagram of a preferred embodiment of a leakage overvoltage test circuit according to Embodiment 1 of the present invention;

3 is a schematic diagram of a preferred embodiment of a leakage overvoltage test circuit according to Embodiment 1 of the present invention; Road map

4 is a circuit diagram of another preferred embodiment of a leakage overvoltage test circuit according to Embodiment 1 of the present invention;

5 is a schematic diagram of a leakage overvoltage tester according to Embodiment 2 of the present invention;

FIG. 6 is a flowchart of a method for using a leakage overvoltage tester according to Embodiment 2 of the present invention.

Icon: 1-leakage overvoltage test circuit; 10-speed selection circuit; 11-transformer circuit; 12-rectification filter circuit; 13-comparison circuit; 14-output circuit; 15-reference voltage input circuit; .

detailed description

The embodiments of the present invention will be clearly and completely described in detail with reference to the accompanying drawings. An embodiment. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The current leakage test circuit cannot simultaneously provide the leakage current, and the leakage current is the active voltage or the reactive voltage. Based on this, the leakage current overvoltage test circuit, the leakage overvoltage tester and the test method provided by the embodiments of the present invention can simultaneously Give the leakage and leakage type.

In order to facilitate understanding of the embodiment, a leakage overvoltage test circuit disclosed in the embodiment of the present invention is first introduced in detail.

Example 1

As shown in FIG. 1, a leakage overvoltage test circuit includes: a transformer circuit 11, a rectification filter circuit 12, a comparison circuit 13, an output circuit 14, and a voltmeter V; and a transformer circuit 11 for transforming a leakage voltage And output to the rectification and filtering circuit 12; the rectification and filtering circuit 12 is used for the leakage current after the transformation The voltage is rectified and filtered; the comparison circuit 13 is configured to compare the rectified and filtered leakage voltage with a reference voltage, and output the comparison result to the output circuit 14; the output circuit 14 displays the comparison result; the voltmeter V is disposed in the transformer circuit 11, The input of the rectification filter circuit 12, the comparison circuit 13 or the output circuit 14.

Based on the leakage overvoltage test circuit of the above architecture, the present embodiment provides a leakage overvoltage test method, and the specific implementation manner is as follows.

The leakage voltage is transformed by the transformer circuit 11 and output to the rectifying and filtering circuit 12; the rectified leakage voltage is rectified and filtered by the rectifying and filtering circuit 12; and the rectified and filtered leakage voltage and the reference voltage are performed by the comparing circuit 13. The comparison result is output to the output circuit 14; finally, the output circuit 14 displays the comparison result; the voltmeter detects and displays the leakage voltage. Corresponding display according to the comparison results, both the leakage type and the overvoltage display of the active voltage are provided, which facilitates the leakage detection and maintenance of the transmission network and electrical equipment.

As shown in FIG. 2 and FIG. 3, as another embodiment of the present embodiment, a gear selection circuit 10 is further included, and the leakage voltage is input to the transformer circuit 11 via the gear selection circuit 10. The transformer circuit 11 includes a primary induction coil L1, a core, and a secondary induction coil L2.

The gear selection circuit 10 includes a plurality of gear switches, and the different gear switches are connected to different positions of the primary induction coil L1 according to different voltage values. The voltage range voltage of the gear selection circuit 10 in this embodiment is preferably, but not limited to, 2V, 127V, 220V, 380V, 660V, 1140V, and 1250V, which can meet the leakage detection of common transmission networks and electrical equipment. Corresponding configuration is made according to the range of the applied voltage of the detected object.

In order to improve the safety of the leakage detection, the input terminal of the gear selection circuit 10 of the present embodiment is further connected with a fuse FUSE, that is, the leakage current enters the gear selection circuit 10 via the fuse FUSE. If the transmission line or electrical equipment has a large current due to a short circuit, or if other conditions occur, the current exceeds the fuse. When FUSE is rated for current, blow the fuse to protect other circuits.

It should be noted that the voltmeter V of this embodiment is preferably provided at the input end of the gear selection circuit 10.

The rectifying and filtering circuit 12 in this embodiment includes a bridge rectifying circuit, and a π-type filtering circuit connected in series with the bridge rectifying circuit, and the π-type filtering circuit is connected to the comparing circuit 13.

First, the leakage voltage is full-wave rectified by the bridge rectifier circuit, and then the rectified leakage voltage is filtered by a π-type filter circuit, and the rectified and filtered leakage voltage is output to the comparison circuit 13.

The comparison circuit 13 in this embodiment uses the existing comparison chip to compare the filter-rectified leakage voltage with the reference voltage, and the reference voltage can be the same voltage value. The comparison circuit of the embodiment has a simple structure and is directly compared. Faster.

In this embodiment, different reference voltages may be configured for different gears, and the reference voltage is preferably associated with the gear, that is, the reference voltage is also selected while the gear is selected. This embodiment is suitable for A leakage overvoltage test circuit having a large voltage measurement range, and a leakage overvoltage test circuit using such an embodiment has a wider use range.

As shown in FIG. 4, the comparison circuit 13 in this embodiment is preferably further connected to the reference voltage input circuit 15, receives the reference voltage manually input by the user, and sends it to the comparison circuit 13, which compares the rectified and filtered leakage voltage. Compared with the received reference voltage, this embodiment is flexible and allows the user to change the reference voltage based on experience and detection scenarios.

As an embodiment of the embodiment, the output circuit 14 displays the comparison result through the alarm, and the alarm includes a plurality of alarm sounds; the comparison result is classified, and the classified comparison result is associated with the alarm sound. Specifically:

When the leakage voltage is an active voltage, and when the rectified and filtered leakage voltage is greater than or equal to the reference voltage, the alarm outputs a first alarm sound; when the rectified and filtered leakage voltage is less than the reference voltage, The policer outputs a second alarm sound.

The active voltage can drive the electrical equipment to work. Therefore, when the leakage is the active voltage, different classification comparison results are output through the alarm sounds of different alarms. At the same time, the voltmeter also shows the value of the leakage voltage.

The reactive voltage cannot drive the electrical equipment. Therefore, when the leakage voltage is reactive voltage, the alarm is in a non-operating state, but at this time, the voltmeter has a leakage voltage value.

It should be noted that when there is no leakage in the transmission line, the voltmeter has no voltage value, and the alarm has no alarm sound.

In addition, the output circuit 14 of the embodiment further includes an indicator light, and the state of the indicator light corresponds to the alarm sound of the alarm, specifically:

When the leakage voltage is the active voltage, and when the rectified and filtered leakage voltage is greater than or equal to the reference voltage, the alarm sound of the alarm is the first alarm sound, and the indicator light displays the first color; the rectified and filtered leakage current When the voltage is less than the reference voltage, the alarm outputs a second alarm sound, and the indicator light displays the second color.

When the leakage is reactive voltage, the alarm is in the non-working state, the indicator light is also in the non-working state, and the voltmeter displays the leakage voltage value.

When the transmission line or electrical equipment has no leakage, the alarm and indicator lights are in non-operating state, and the voltmeter has no voltage value.

The first alarm sound and the second alarm sound in this embodiment may be distinguished by frequency or content. The present embodiment preferably distinguishes by frequency, specifically: the frequency of the first alarm sound is higher than the second alarm sound.

Example 2

This embodiment provides a leakage overvoltage tester, including the leakage overvoltage test circuit 1 described in Embodiment 1.

As shown in FIG. 5, the leakage overvoltage tester in this embodiment further includes a display screen 2 for displaying the leakage voltage.

The embodiment preferably further includes a reference voltage input circuit 15 for inputting a reference voltage, and the reference voltage input circuit 15 allows a worker to set the reference voltage according to experience and a detection scene.

The leakage overvoltage tester provided by the embodiment of the present invention has the same technical features as the leakage overvoltage test circuit 1 provided in the above embodiment, so that the same technical problem can be solved and the same technical effect can be achieved.

As shown in FIG. 6, the embodiment provides a method for using a leakage overvoltage tester, which includes the following steps:

S1. Select the appropriate voltage range according to the power environment.

The gear voltage in this embodiment is preferably, but not limited to, 2V, 127V, 220V, 380V, 660V, 1140V, and 1250V.

S2. Connect the black line to the ground line and place the red line at the leakage detection.

As shown in Figure 3, connect the black line at B to the ground line and the red line at the A end to the leakage detection. The leakage detection location in this step may be the leakage detection of the transmission line, or the leakage detection of the electrical equipment. For example, the induction coil or the switch of the relay may leak, so both of them may become the embodiment. The leakage detection location.

S3. Turn on the circuit, and judge the type of leakage and whether there is leakage overvoltage according to the output information of the output circuit.

When the alarm sounds the first alarm sound and the indicator light is red, the leakage current is active voltage and overvoltage. At this time, timely measures should be taken to repair them.

When the alarm sounds the second alarm sound, the indicator light is yellow, indicating that the leakage current is the active voltage, no There is overpressure.

When the alarm and indicator are in the non-working state, and the voltmeter has a number, the leakage is the reactive voltage.

When the alarm and indicator are in non-operating state, and the voltmeter has no indication, there is no leakage voltage.

In the description of the embodiments of the present invention, the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, a fixed connection or a detachable connection, or Connected integrally; can be mechanical or electrical; can be directly connected or indirectly connected through an intermediate medium, which can be the internal communication between the two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

In the description of the present invention, it is to be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. The orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplified description, rather than indicating or implying that the device or component referred to has a specific orientation, in a specific orientation. Construction and operation, so it cannot be understood as Limitations of the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that the above-mentioned embodiments are merely specific embodiments of the present invention, and are used to explain the technical solutions of the present invention, and are not limited thereto, and the scope of protection of the present invention is not limited thereto, although reference is made to the foregoing. The present invention has been described in detail, and those skilled in the art should understand that any one skilled in the art can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed by the present invention. The changes may be easily conceived, or equivalents may be substituted for some of the technical features. The modifications, variations, or substitutions of the present invention are not intended to depart from the spirit and scope of the technical solutions of the embodiments of the present invention. Within the scope of protection. Therefore, the scope of the invention should be determined by the scope of the claims.

Industrial applicability:

The leakage overvoltage test circuit 1 and the leakage overvoltage tester provided by the embodiment of the present invention transform the leakage voltage through the transformer circuit 11 and output it to the rectification filter circuit 12; the rectification filter circuit 12 performs the voltage leakage voltage after the transformation. Rectifying and filtering; comparing the rectified and filtered leakage voltage with the reference voltage by the comparison circuit 13, and outputting the comparison result to the output circuit 14; finally, the output circuit 14 displays the comparison result. Corresponding display according to the comparison results, both the leakage type and the overvoltage display of the active voltage are provided, which facilitates the leakage detection and maintenance of the transmission network and electrical equipment.

Claims

A leakage overvoltage test circuit, comprising: a transformer circuit, a rectifier filter circuit, a comparison circuit, an output circuit and a voltmeter;

The transformer circuit is configured to transform a leakage voltage and output the same to the rectifier filter circuit;

The rectifying and filtering circuit is configured to perform rectification and filtering on the voltage leakage voltage after the voltage transformation;

The comparison circuit is configured to compare the rectified and filtered leakage voltage with a reference voltage, and output the comparison result to the output circuit;

The output circuit is configured to display the comparison result;

The voltmeter is disposed at an input end of the transformer circuit, the rectifier filter circuit, the comparison circuit, or the output circuit.
The leakage overvoltage test circuit according to claim 1, wherein the leakage overvoltage test circuit further comprises a gear selection circuit, and the leakage voltage is input to the transformer circuit via the gear selection circuit .
The leakage overvoltage test circuit according to claim 2, wherein the input of the gear selection circuit is further connected with a fuse.
The leakage overvoltage test circuit according to claim 2 or 3, wherein said voltmeter is connected to an input terminal of said gear selection circuit.
The leakage overvoltage test circuit according to any one of claims 2 to 4, wherein the transformer circuit comprises a primary induction coil, a core and a secondary induction coil;

The gear selection circuit includes a plurality of gear switches, and the different gear switches are connected to different positions of the primary induction coil according to different voltage values.
The leakage overvoltage test circuit according to any one of claims 2 to 5, characterized in that The gear voltages of the gear selection circuit include: 2V, 127V, 220V, 380V, 660V, 1140V and 1250V.
The leakage overvoltage test circuit according to any one of claims 1 to 6, wherein the rectification and filtering circuit comprises a bridge rectifier circuit, and a π-type filter circuit connected in series with the bridge rectifier circuit, and a π-type filter circuit is connected to the comparison circuit;

The bridge rectifier circuit is configured to perform full-wave rectification on the leakage voltage, and the π-type filter circuit is configured to filter the full-wave rectified leakage voltage, and output the rectified and filtered leakage voltage to the comparison circuit.
The leakage overvoltage test circuit according to any one of claims 1 to 7, wherein the leakage overvoltage test circuit further includes an alarm, and the output circuit displays the comparison result through the alarm. The alarm is pre-set with several kinds of alarm sounds;

The output circuit is configured to classify the comparison result and to match the classified comparison result with the alarm sound.
The leakage overvoltage test circuit according to claim 8, wherein when the leakage voltage is an active voltage, and when the rectified and filtered leakage voltage is greater than or equal to the reference voltage, the alarm configuration And outputting a first alarm sound; when the rectified and filtered leakage voltage is less than the reference voltage, the alarm is configured to output a second alarm sound.
The leakage overvoltage test circuit according to claim 8 or 9, wherein the alarm is configured to be in an inoperative state when the leakage voltage is a reactive voltage.
The leakage overvoltage test circuit according to any one of claims 8 to 10, characterized in that the output circuit further comprises an indicator light whose state corresponds to an alarm sound of the alarm.
The leakage overvoltage test circuit according to any one of claims 1 to 11, characterized in that The leakage overvoltage test circuit further includes a reference voltage input circuit;

The reference voltage input circuit is configured to receive a reference voltage manually input by a user and send it to the comparison circuit.
A leakage overvoltage tester comprising the leakage overvoltage test circuit of any of claims 1-12.
The leakage overvoltage tester according to claim 13, wherein the leakage overvoltage tester further comprises a display screen;

The display screen is configured to display a leakage voltage output by the leakage overvoltage test circuit.
A leakage overvoltage test method, characterized by being applied to the leakage overvoltage test circuit according to any one of claims 1 to 12, the method comprising:

The transformer circuit converts the leakage voltage and outputs it to the rectifier filter circuit;

The rectifying and filtering circuit rectifies and filters the voltage leakage voltage after the voltage transformation and outputs the same to the comparison circuit;

The comparison circuit compares the rectified and filtered leakage voltage with a reference voltage, and outputs the comparison result to the output circuit;

The output circuit displays the comparison result;

The voltmeter detects and displays the leakage voltage.
The leakage overvoltage test method according to claim 15, wherein the reference voltages of the leakage voltages of the different gears are the same voltage value.
The leakage overvoltage test method according to claim 15, wherein the leakage voltages of the different gears are configured with reference voltages of different voltage values.
The leakage current overvoltage test method according to any one of claims 15 to 17, wherein the method further comprises:

When the leakage voltage is an active voltage, if the rectified and filtered leakage voltage is greater than or equal to the reference current Pressing, the alarm sound of the control alarm is the first alarm sound, and the control indicator light displays the first color; if the rectified filtered leakage voltage is less than the reference voltage, the control alarm outputs the second alarm sound, and the control indicator shows the first Two colors;

When the leakage voltage is reactive voltage, the control alarm is in a non-working state, the control indicator is in a non-operating state, and the voltmeter displays the leakage voltage value;

When the transmission line or electrical equipment has no leakage, the control alarm and indicator light are in non-operating state, and the voltmeter has no voltage value.