CN212780997U

CN212780997U - Ground resistance tester

Info

Publication number: CN212780997U
Application number: CN202021384063.9U
Authority: CN
Inventors: 周茂林
Original assignee: Guangdong Surui Automatic Testing Technology Co ltd
Current assignee: Guangdong Surui Automatic Testing Technology Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-03-23
Anticipated expiration: 2030-07-14

Abstract

The utility model discloses a ground resistance tester, include: the device comprises a main control module, a measuring module, a voltage induction module and a current induction module. The main control module comprises a first processor, a first communication interface, a test result communication unit and a test result display unit, the measuring module comprises a second processor, a second communication interface, a waveform signal generating unit, a power driving unit, a voltage monitoring unit and a feedback signal receiving unit, the voltage sensing module is used for exciting the grounding circuit to generate loop current, and the current sensing module is used for being excited by the loop current of the grounding circuit to generate induced current. The utility model discloses the ground resistance tester can carry out 24 hours automatic measure ground resistance to upload test data to the high in the clouds server automatically or preserve locally at the ground resistance tester, real-time supervision equipment ground resistance's change and trend, in time report to the police and the maintenance, thereby effective prevention production accident. The utility model discloses wide application in ground resistance test technical field.

Description

Ground resistance tester

Technical Field

The utility model belongs to the technical field of ground resistance test technique and specifically relates to a ground resistance tester.

Background

The grounding performance of an electric power system or a key building is very critical, and a special staff is arranged in the electric power system to regularly patrol facilities such as substations in various places. Various problems arise in the implementation. Due to the factors of personnel replacement, difficult journey, lack of supervision and the like, the regular inspection is easy to miss and even cause fakes. Some areas even go to investigation after failure. Therefore, the production accident of poor grounding of the transformer equipment is easily caused, and the accident can not be effectively prevented.

SUMMERY OF THE UTILITY MODEL

To above-mentioned at least one technical problem, an object of the utility model is to provide an earth resistance tester.

The embodiment of the utility model provides an in, ground resistance tester includes:

the main control module comprises a first processor, a first communication interface, a test result communication unit and a test result display unit; the first processor is respectively connected with the first communication interface, the test result communication unit and the test result display unit;

the measuring module comprises a second processor, a second communication interface, a waveform signal generating unit, a power driving unit, a voltage monitoring unit and a feedback signal receiving unit; the second processor is respectively connected with the second communication interface, the waveform signal generating unit, the voltage monitoring unit and the feedback signal receiving unit, and the waveform signal generating unit is connected with the power driving unit;

the voltage induction module is respectively connected with the power driving unit and the voltage monitoring unit and is used for exciting a grounding circuit to generate loop current;

the current sensing module is connected with the feedback signal receiving unit and is used for being excited by loop current of the grounding circuit to generate induced current;

the first communication interface is connected with the second communication interface.

Further, the waveform signal generation unit includes a voltage follower and a low-pass filter circuit connected in series.

Further, the power driving unit comprises an integrated operational amplifier, a ninety-fifth resistor, a ninety-eighth resistor, a one-hundred-zero-first resistor, a one-hundred-second resistor, a one-hundred-third resistor, a fifty-ninth capacitor and a sixty capacitor;

the ninety fifth resistor is connected with the output end and the non-inverting input end of the integrated operational amplifier;

the first hundred-zero second resistor is connected with the output end and the inverted input end of the integrated operational amplifier;

one end of the ninety-eight resistor is connected with the non-inverting input end of the integrated operational amplifier, and the other end of the ninety-eight resistor is grounded through the first hundred-zero resistor;

the one hundred-zero three resistor and the fifty-ninth capacitor are connected in parallel;

and the inverting input end of the integrated operational amplifier is grounded through the first hundred-zero resistor and the sixteenth capacitor in sequence.

Furthermore, the non-inverting input end of the integrated operational amplifier is connected with the waveform signal generating unit, and the output end of the integrated operational amplifier is connected with the voltage sensing module.

Further, the voltage monitoring unit comprises a first double-end-to-single-end circuit and a first band-pass filter circuit which are connected in series.

Further, the feedback signal receiving unit comprises a second double-end-to-single-end circuit and a second band-pass filter circuit which are connected in series.

Further, the voltage induction module is a voltage clamp, and the current induction module is a current clamp.

Furthermore, the main control module further comprises a data storage unit, and the data storage unit is connected with the first processor.

Furthermore, the main control module further comprises a human-computer interaction unit and an external communication interface, and the human-computer interaction unit and the external communication interface are both connected with the first processor.

Furthermore, the test result communication unit is a GPRS communicator, and the test result display unit is an OLED display screen.

The utility model has the advantages that: the ground resistance tester in the embodiment is installed beside a grounding wire of a transformer substation, can automatically measure the ground resistance within 24 hours, and automatically uploads test data to a cloud server or is stored locally in the ground resistance tester. The cloud server can monitor the change and the trend of the grounding resistance of the equipment in real time, and timely give an alarm and maintain, so that production accidents are effectively prevented.

Drawings

Fig. 1 is a schematic structural diagram of a ground resistance tester in an embodiment of the present invention;

fig. 2 is a circuit diagram of a waveform signal generating unit and a power driving unit according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a voltage monitoring unit according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a feedback signal receiving unit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of the ground resistance tester in the embodiment of the present invention;

fig. 6 is a circuit diagram of a data storage unit according to an embodiment of the present invention;

fig. 7 is a circuit diagram of a man-machine interaction unit according to an embodiment of the present invention;

fig. 8 is a circuit diagram of a test result communication unit according to an embodiment of the present invention;

fig. 9 is a circuit diagram of a test result display unit according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an arrangement of the ground resistance tester according to an embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In this embodiment, referring to fig. 1, the ground resistance tester includes a main control module, a measurement module, a voltage sensing module, and a current sensing module.

Referring to fig. 1, the main control module includes a first processor, a first communication interface, a test result communication unit, and a test result display unit. The first processor is respectively connected with the first communication interface, the test result communication unit and the test result display unit.

Referring to fig. 1, the measurement module includes a second processor, a second communication interface, a waveform signal generation unit, a power driving unit, a voltage monitoring unit, and a feedback signal receiving unit. The second processor is respectively connected with the second communication interface, the waveform signal generating unit, the voltage monitoring unit and the feedback signal receiving unit, and the waveform signal generating unit is connected with the power driving unit;

in this embodiment, the voltage sensing module is a voltage clamp and the current sensing module is a current clamp. Referring to fig. 1, the voltage sensing module is connected to the power driving unit and the voltage monitoring unit, respectively, and the current sensing module is connected to the feedback signal receiving unit.

In this embodiment, the second processor controls the waveform signal generating unit to generate waveform signals such as sine waves and triangular waves, and the waveform signals are input to the power driving unit, amplified by the power driving unit, and then sent to the voltage sensing module. The voltage induction module is driven by the power driving unit to excite a grounding circuit such as a tested grounding wire and the like to generate loop current. When the tested ground wire generates loop current, the loop current is induced by the voltage induction module and the current induction module, and a signal induced by the voltage induction module is processed by the voltage monitoring unit and is sent to the second processor; the signal that the current induction module sensed is through feedback signal receiving element's processing, sends to the second treater. The second processor receives signals sent by the voltage sensing module and the current sensing module, generates a data message after analog-to-digital conversion and the like, and sends the data message to the main control module through the second communication interface.

In this embodiment, the main control module and the measurement module are connected by a 32-pin connector. Specifically, a first communication interface in the main control module is connected with a second communication interface in the measurement module through a 32-pin connector.

And a first processor in the main control module receives the data message sent by a second processor through a first communication interface, and the test and sampling of the tested ground wire are completed.

The data message includes information such as induced voltage of the voltage induction module and induced current of the current induction module, and the data message may also include information such as electrical parameters of the waveform signal generated by the waveform signal generation unit controlled by the second processor. Based on the information and the electrical knowledge, the first processor may output the ground resistance of the ground line to be tested, that is, output the test result of the ground line to be tested, through an internal integrated program or a dedicated circuit.

The first treater can control the test result display element and show data message or to the further processing result display of data message, thereby makes the utility model discloses ground resistance tester's user can be through observing test result display element, knows the test result to being surveyed the earth connection immediately. The first processor can also control the test result communication unit to upload the data message or the further processing result of the data message to the cloud server and the like, so that the cloud server can receive and record the data message, and further analysis can be performed. In this embodiment, the test result communication unit may be a GPRS communication module or a bluetooth communication module.

In this embodiment, a circuit diagram of the waveform signal generating unit and the power driving unit is shown in fig. 2. Referring to fig. 2, the waveform signal generating unit includes a voltage follower built by taking the integrated operational amplifier U10B as a core and a low-pass filter circuit built by taking the integrated operational amplifier U10A as a core, and the voltage follower and the low-pass filter circuit are connected in series to form the waveform signal generating unit.

Referring to fig. 2, the power driving unit includes an integrated operational amplifier U12, a ninety-fifth resistor R95, a ninety-eighth resistor R98, a one-hundred-zero-first resistor R101, a one-hundred-second resistor R102, a one-hundred-zero-third resistor R103, a fifty-ninth capacitor C59, and a sixty capacitor C60. The ninety-fifth resistor R59 is connected with the output end and the non-inverting input end of the integrated operational amplifier U12, the first hundred-second resistor R102 is connected with the output end and the inverting input end of the integrated operational amplifier U12, one end of the ninety-eighth resistor R98 is connected with the non-inverting input end of the integrated operational amplifier U12, the other end of the ninety-eighth resistor R98 is grounded through the first hundred-zero three resistor R103, the first hundred-zero three resistor R103 is connected with the fifty-ninth capacitor C59 in parallel, and the inverting input end of the integrated operational amplifier U12 is grounded through the first hundred-zero one resistor R101 and the sixty capacitor C60 in sequence.

Referring to fig. 2, the non-inverting input terminal of the integrated operational amplifier U12 is connected to the waveform signal generating unit. The output end of the integrated operational amplifier U12 is connected with the voltage sensing module.

In this embodiment, referring to fig. 3, the voltage monitoring unit includes a first double-end-to-single-end circuit built by integrated operational amplifiers U6A and U7A and a first band-pass filter circuit built by integrated operational amplifier U6B as a core, and the first double-end-to-single-end circuit and the first band-pass filter circuit are connected in series. The input end of the first double-end-to-single-end conversion circuit is connected with the voltage induction module, and the output end of the first band-pass filter circuit is connected with the second processor.

The principle of the voltage monitoring unit shown in fig. 3 is: one end of the first double-end-to-single-end circuit is connected with the voltage induction module, and one end of the first double-end-to-single-end circuit is connected with the first band-pass filter circuit, so that a first band-pass filter signal with a single-ended input end can be matched with the voltage induction module with a double-ended output end. The voltage signal output by the voltage induction module is received through the first double-end-to-single-end circuit, and the first band-pass filtering signal carries out band-pass filtering on the voltage signal and then sends the voltage signal to the second processor.

In this embodiment, the circuit structure of the feedback signal receiving unit is similar to that of the voltage monitoring unit. Referring to fig. 4, the feedback signal receiving unit includes a second double-end-to-single-end circuit built by integrated operational amplifiers U8A and U8B and a second band-pass filter circuit built by an integrated operational amplifier U7B as a core, and the second double-end-to-single-end circuit and the second band-pass filter circuit are connected in series. The input end of the second double-end-to-single-end circuit is connected with the current sensing module, and the output end of the second band-pass filter circuit is connected with the second processor.

The principle of the feedback signal receiving unit shown in fig. 4 is: one end of the double ends of the second double-end-to-single-end circuit is connected with the current sensing module, and one end of the single end of the second double-end-to-single-end circuit is connected with the second band-pass filter circuit, so that a second band-pass filter signal with a single-ended input end can be matched with the current sensing module with a double-ended output end. The current signal output by the current sensing module is received through the second double-end-to-single-end circuit, and the second band-pass filtering signal carries out band-pass filtering on the current signal and then sends the current signal to the second processor.

In this embodiment, referring to fig. 5, the main control module further includes a data storage unit, a human-computer interaction unit, and an external communication interface. The data storage unit, the man-machine interaction unit and the external communication interface are all connected with the first processor.

In this embodiment, the external communication interface may be a USB interface or the like, so that an external device such as a personal computer is connected to the first processor, and acquires a data packet from the first processor, or performs firmware upgrade on the first processor.

In this embodiment, a circuit structure of the data storage unit is as shown in fig. 6. Fig. 6 is a TF card connection interface circuit, when the circuit shown in fig. 6 is connected with a TF card, it has a data storage function, and can store the data message output by the first processor, thereby implementing local storage of the test result.

In this embodiment, a circuit structure of the human-computer interaction unit is shown in fig. 7. Fig. 7 is a circuit for a set of manually operated buttons that may be used to detect button presses and thereby receive control commands from an operator to the first processor.

In this embodiment, a circuit structure of the test result communication unit is shown in fig. 8. Fig. 8 is a circuit diagram of a GPRS communicator, i.e., the test result communication unit in this embodiment may be a GPRS communicator. By setting the GPRS communicator as a test result communication unit, the first processor in this embodiment can send the data packet to a cloud server and other devices through a GPRS network for cloud storage or deep analysis.

In this embodiment, a circuit structure of the test result display unit is shown in fig. 9. Fig. 9 is a circuit diagram of an OLED display panel, that is, the test result display unit in this embodiment may be an OLED display panel. By setting the OLED display screen as the test result display unit, the first processor in this embodiment can display the data message through the OLED display screen in real time for the user to observe.

When the ground resistance tester in this embodiment is used to perform ground resistance testing, a plurality of ground resistance testers may be arranged at different positions of the same ground device in a manner shown in fig. 10, each ground resistance tester uploads a test result to the cloud server through the GPRS network, and the cloud server may store or further analyze the test result. For example, the cloud server may obtain a time variation trend of the test result according to an analysis result of the test result, and alarm if an abnormality occurs.

According to the mode shown in fig. 10, the ground resistance tester is installed beside the grounding wire of the substation, can automatically measure the ground resistance within 24 hours, and automatically uploads the test data to the cloud server. The cloud server runs monitoring software to monitor the change and trend of the ground resistance of the equipment in real time, and timely gives an alarm and maintains, so that production accidents are effectively prevented, feasible convenience and simple application are provided for monitoring the ground resistance of the power system, and contribution is made to industry development and safe production.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present disclosure in the drawings. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, unless defined otherwise, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment, the term "and/or" includes any combination of one or more of the associated listed items.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as, "etc.), provided with the present embodiments is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.

It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.

Further, operations of processes described in this embodiment can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described in this embodiment (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.

Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the computer may be used to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The utility model described in this embodiment includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

A computer program can be applied to input data to perform the functions described in the present embodiment to convert the input data to generate output data that is stored to a non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on the display.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, as long as it achieves the technical effects of the present invention by the same means, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention. The technical solution and/or the embodiments of the invention may be subject to various modifications and variations within the scope of the invention.

Claims

1. An earth resistance tester, comprising:

2. The ground resistance tester of claim 1, wherein the waveform signal generating unit comprises a voltage follower and a low pass filter circuit in series.

3. The ground resistance tester of claim 1, wherein:

the power driving unit comprises an integrated operational amplifier, a ninety-fifth resistor, a ninety-eighth resistor, a first hundred-zero resistor, a second hundred-zero resistor, a third hundred-zero resistor, a fifty-ninth capacitor and a sixty capacitor;

4. The ground resistance tester of claim 3, wherein the non-inverting input of the integrated operational amplifier is connected to the waveform signal generating unit, and the output of the integrated operational amplifier is connected to the voltage sensing module.

5. The ground resistance tester of claim 1, wherein the voltage monitoring unit comprises a first double-to-single-ended circuit and a first band-pass filter circuit connected in series.

6. The ground resistance tester of claim 1, wherein the feedback signal receiving unit comprises a second double-to-single-ended circuit and a second band-pass filter circuit connected in series.

7. The ground resistance tester of any one of claims 1-6 wherein the voltage sensing module is a voltage clamp and the current sensing module is a current clamp.

8. The ground resistance tester of any one of claims 1-6, wherein the master control module further comprises a data storage unit, the data storage unit being connected to the first processor.

9. The ground resistance tester of any one of claims 1-6, wherein the master control module further comprises a human-computer interaction unit and an external communication interface, both of which are connected to the first processor.

10. A ground resistance tester as claimed in any one of claims 1 to 6 wherein the test result communication unit is a GPRS communicator and the test result display unit is an OLED display screen.