CN116125163A - Resistance testing device and resistance testing method - Google Patents

Resistance testing device and resistance testing method Download PDF

Info

Publication number
CN116125163A
CN116125163A CN202211548968.9A CN202211548968A CN116125163A CN 116125163 A CN116125163 A CN 116125163A CN 202211548968 A CN202211548968 A CN 202211548968A CN 116125163 A CN116125163 A CN 116125163A
Authority
CN
China
Prior art keywords
resistance
module
test
resistor
tested
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211548968.9A
Other languages
Chinese (zh)
Inventor
熊超
朱磊
陈海永
徐晟�
胡忠山
黎剑波
黄华
甘卿忠
冯家伟
卢凯欣
王昊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Bureau of Extra High Voltage Power Transmission Co
Original Assignee
Guangzhou Bureau of Extra High Voltage Power Transmission Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou Bureau of Extra High Voltage Power Transmission Co filed Critical Guangzhou Bureau of Extra High Voltage Power Transmission Co
Priority to CN202211548968.9A priority Critical patent/CN116125163A/en
Publication of CN116125163A publication Critical patent/CN116125163A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The application relates to a resistance testing device and a resistance testing method. The device comprises: the power module is used for providing a test electric signal; the first bridge testing module is respectively connected with the power supply module and the resistor device to be tested; the volt-ampere testing module is respectively connected with the power supply module and the resistor to be tested and is used for detecting the current value flowing through the resistor to be tested; the control module is respectively connected with the first bridge testing module, the volt-ampere testing module and the power module and is used for controlling the first bridge testing module to test the resistance value of the resistance device to be tested so as to obtain a first resistance value of the resistance device to be tested, obtaining a second resistance value of the resistance device to be tested according to the current value and the voltage signal provided by the power module and determining the resistance value of the resistance device to be tested according to the first resistance value and the second resistance value. And combining the first bridge test module and the volt-ampere test module, the resistance value of the resistor device to be tested can be accurately obtained, so that the fault of the secondary current loop can be accurately detected.

Description

Resistance testing device and resistance testing method
Technical Field
The present disclosure relates to the field of testing technologies, and in particular, to a resistance testing device and a resistance testing method.
Background
In the overhaul process of the secondary current loop in the ultra-high voltage converter station, the resistance of the secondary current loop needs to be tested to judge whether the secondary current loop is open or not or whether faults such as loose connection piece of a current terminal, large wiring contact resistance, loose wiring of a wire core, multipoint grounding of the current loop and the like exist.
In the related art, an ohmmeter is generally used to perform a resistance test on a secondary current loop, and whether the current loop has the above faults is determined by data obtained by the ohmmeter test.
However, the resistance obtained by the ohmmeter test is not accurate enough.
Disclosure of Invention
In view of the above, it is desirable to provide a resistance test device and a resistance test method capable of accurately detecting a failure of a secondary current loop.
In one aspect, the present application provides a resistance testing device, comprising:
the power module is used for providing a test electric signal;
the first bridge testing module is respectively connected with the power supply module and the resistor device to be tested;
the volt-ampere testing module is respectively connected with the power supply module and the resistor device to be tested and is used for detecting the current value flowing through the resistor device to be tested;
the control module is respectively connected with the first bridge test module, the volt-ampere test module and the power supply module and is used for controlling the first bridge test module to test the resistance value of the resistance device to be tested so as to obtain a first resistance value of the resistance device to be tested, obtaining a second resistance value of the resistance device to be tested according to the current value and a voltage signal provided by the power supply module and determining the resistance value of the resistance device to be tested according to the first resistance value and the second resistance value.
In one embodiment, the resistance testing device is configured with a first testing terminal and a second testing terminal, wherein the first testing terminal is used for being connected with a first end of the resistance device to be tested, and the second testing terminal is used for being connected with a second end of the resistance device to be tested; wherein, the liquid crystal display device comprises a liquid crystal display device,
the positive electrode end of the power supply module is connected with the first test terminal, and the negative electrode end of the power supply module is connected with the second test terminal;
the volt-ampere test module is connected with the power supply module in parallel.
In one embodiment, the first bridge test module includes: the first resistor, the second resistor, the third resistor, the first adjustable resistor, the second adjustable resistor and the galvanometer; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first end of the first adjustable resistor is connected with the first test terminal, and the second end of the first adjustable resistor is connected with the first end of the first resistor and the first end of the galvanometer respectively;
the first end of the second adjustable resistor is connected with the second test terminal, and the second end of the second adjustable resistor is respectively connected with the first end of the second resistor and the second end of the galvanometer;
the second end of the second resistor and the second test terminal are respectively connected with the first end of the third resistor, and the second end of the first resistor is connected with the second end of the third resistor.
In one embodiment, the control module is further configured to obtain a resistance difference value according to the first resistance value and the second resistance value, and when the difference value is smaller than a preset value, use the first resistance value as the resistance value of the to-be-tested resistor device.
In one embodiment, the control module is further configured to obtain a resistance difference value according to the first resistance value and the second resistance value, and output an overhaul prompt signal when the difference value is greater than a preset value.
In one embodiment, the resistance testing device further comprises:
the verification module is respectively connected with a first test terminal and a second test terminal configured by the resistance test device and is used for detecting the verification internal resistance between the first test terminal and the second test terminal;
the control module is further connected with the verification module and is used for controlling the verification module to work under the condition that the resistance difference between the first resistance value and the second resistance value is larger than a preset value, comparing the verification internal resistance with the initial internal resistance of the first bridge test module, and outputting an alarm signal if the verification internal resistance is smaller than the initial internal resistance.
In one embodiment, the control module is further configured to output an off signal when the current value is higher than a current threshold for a preset period of time;
the resistance test device further includes:
and the overload protection module is respectively connected with the first bridge testing module, the volt-ampere testing module and the control module and is used for disconnecting a testing passage between the volt-ampere testing module and the resistance device to be tested according to the disconnection signal and disconnecting the testing passage between the first bridge testing module and the resistance device to be tested.
In one embodiment, the resistance testing device further comprises:
the second bridge testing module is respectively connected with the power supply module and the resistor device to be tested;
the switch module is respectively connected with the first bridge test module, the second bridge test module, the resistance device to be tested and the control module and is used for conducting a first bridge test passage between the first bridge test module and the resistance device to be tested in a time-sharing mode under the control of the control module so as to detect a first resistance value of the resistance device to be tested and a second bridge test passage between the second bridge test module and the resistance device to be tested.
In one embodiment, the power module is further configured to output test electrical signals of different gears under control of the control module, where the test electrical signals include at least one of a current signal and a voltage signal.
In another aspect, the present application further provides a resistance testing method, including:
acquiring a first resistance value of a resistor to be tested by using a first bridge test module;
acquiring a second resistance value of the resistor to be tested according to the current value detected by the volt-ampere test module and the voltage signal provided by the power supply module; the current value is a current value flowing through the resistor device to be tested and the power supply module;
and determining the resistance value of the resistor to be measured according to the first resistance value and the second resistance value.
According to the resistance testing device and the resistance testing method, after the power module provides the testing electric signal, the control module controls the first bridge testing module to conduct resistance testing on the resistance device to be tested to obtain the first resistance value, and then the volt-ampere testing module conducts resistance testing on the resistance device to be tested to obtain the second resistance value. The first bridge test module and the volt-ampere test module are respectively connected with the power module and the resistor to be tested, the test loops are not interfered with each other, and the first resistance value obtained by the first bridge test module is high in accuracy, so that whether the first resistance value obtained by the first bridge test module is accurate or not can be judged according to the first resistance value and the second resistance value obtained by independent tests, and the resistance value of the resistor to be tested can be determined under the condition that the first resistance value obtained by the first bridge test module is accurate. The resistance value of the resistor to be detected can be accurately obtained through the first resistance value and the second resistance value, so that the fault of the secondary current loop can be accurately detected according to the accurate resistance value.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a resistance testing device according to an embodiment;
FIG. 2 is a schematic diagram of a resistance testing device according to an embodiment;
FIG. 3 is a circuit diagram of a first bridge test module in a resistance test apparatus according to one embodiment;
FIG. 4 is a schematic diagram of a resistance testing device according to an embodiment;
FIG. 5 is a schematic diagram of a resistance testing device according to an embodiment;
FIG. 6 is a circuit diagram of a second bridge test module in a resistance test apparatus according to one embodiment;
FIG. 7 is a flow chart of a method for testing resistance in one embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments should be understood as "electrical connection", "communication connection", and the like if there is transmission of electrical signals or data between objects to be connected.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
As described in the background art, in the prior art, in the process of overhauling a secondary current loop, the resistor obtained by the ohmmeter test is inaccurate, fault misjudgment is easy to be caused, and the inventor researches that the problem is caused by the fact that the ohmmeter is easy to be influenced by the electromagnetic field environment in a converter station in an overhauling site, so that the reading of the ohmmeter cannot truly reflect actual data, the test data of the ohmmeter generally remain in the position behind a decimal point, and when the loop resistor with smaller accuracy is tested, the data difference cannot be obviously reflected, so that fault detection cannot be accurately performed.
For the above reasons, the present application provides a resistance testing device.
In one embodiment, as shown in FIG. 1, there is provided a resistance testing apparatus comprising: a power module 10, a first bridge test module 20, a volt-ampere test module 30, and a control module 40, wherein:
the power module 10 is used for providing test electrical signals. The first bridge test module 20 is connected to the power module 10 and the resistive device 50 to be tested, respectively. The volt-ampere test module 30 is connected to the power module 10 and the resistive device 50 to be tested, respectively, and is used for detecting the current value flowing through the resistive device 50 to be tested. The control module 40 is respectively connected to the first bridge testing module 20, the volt-ampere testing module 30, and the power module 10, and is configured to control the first bridge testing module 20 to test the resistance value of the resistive device 50 to be tested, obtain a first resistance value of the resistive device 50 to be tested, obtain a second resistance value of the resistive device 50 to be tested according to the current value and the voltage signal provided by the power module 10, and determine the resistance value of the resistive device 50 to be tested according to the first resistance value and the second resistance value.
Specifically, the power module 10 provides a direct current power supply. Alternatively, it may be powered by a lithium battery. The first bridge test module 20 includes testing based on the two-arm bridge principle. The double-arm bridge is a bridge which combines a four-terminal lead method and a balance comparison method of the bridge to precisely measure low resistance. The voltammetric test module 30 includes an ammeter. The resistive device under test 50 includes a current transformer on the secondary current loop. The control module 40 comprises a single-chip microcomputer. The singlechip has a data processing function, and can calculate and obtain a first resistance value of the resistor device 50 to be tested according to a double-arm bridge test method, and obtain a second resistance value of the resistor device 50 to be tested according to a ratio of a voltage signal provided by the power supply module 10 to a current value detected by the volt-ampere test module 30.
According to the resistance testing device, after the power module provides the test electric signal, the control module controls the first bridge testing module to conduct resistance testing on the resistance device to be tested to obtain the first resistance value, and then the volt-ampere testing module conducts resistance testing on the resistance device to be tested to obtain the second resistance value. The first bridge test module and the volt-ampere test module are respectively connected with the power module and the resistor to be tested, the test loops are not interfered with each other, and the first resistance value obtained by the first bridge test module is high in accuracy, so that whether the first resistance value obtained by the first bridge test module is accurate or not can be judged according to the first resistance value and the second resistance value obtained by independent tests, and the resistance value of the resistor to be tested can be determined under the condition that the first resistance value obtained by the first bridge test module is accurate. The resistance value of the resistor to be detected can be accurately obtained through the first resistance value and the second resistance value, so that the fault of the secondary current loop can be accurately detected according to the accurate resistance value.
In addition, because the power supply potential of the power supply module is higher, the energy is larger, and compared with an ohmmeter, the power supply module is not easily influenced by the electromagnetic field environment in the converter station in the overhaul field, so that the test result cannot deviate due to environmental interference.
In one embodiment, as shown in fig. 2, the resistance testing device is configured with a first test terminal 610 and a second test terminal 620. Wherein the first test terminal 610 is configured to be connected to a first end of the resistive device under test 50 and the second test terminal 620 is configured to be connected to a second end of the resistive device under test 50. Wherein the positive terminal of the power module 10 is connected to the first test terminal 610, and the negative terminal of the power module 10 is connected to the second test terminal 620. The voltammetric test module 30 is connected in parallel with the power module 10.
Specifically, the first test terminal 610 includes a first current test terminal and a first voltage test terminal, and the second test terminal 620 includes a second current test terminal and a second voltage test terminal. When the test is started, the first current test terminal and the first voltage test terminal are respectively connected with the first end of the resistor device 50 to be tested through the test wires, and the second current test terminal and the second voltage test terminal are respectively connected with the second end of the resistor device 50 to be tested through the test wires. In the connection process, the test wires are firmly connected with the four terminals and the two ends of the resistor device 50 to be tested, so that virtual connection is avoided.
In this embodiment, the first test terminal and the second test terminal are respectively connected with the to-be-tested resistive device, so that the to-be-tested resistive device and the test circuit part inside the resistance test device can form a closed loop, thereby performing resistance test on the to-be-tested resistive device.
In one embodiment, as shown in fig. 3, the first bridge test module includes: a first resistor R1, a second resistor R2, a third resistor R3, a first adjustable resistor RX1, a second adjustable resistor RX2, and a galvanometer 210, wherein:
a first end of the first adjustable resistor RX1 is connected to the first test terminal 610, and a second end of the first adjustable resistor RX1 is connected to the first end of the first resistor R1 and the first end of the galvanometer 210, respectively. The first end of the second adjustable resistor RX2 is connected to the second test terminal 620, and the second end of the second adjustable resistor RX2 is connected to the first end of the second resistor R2 and the second end of the galvanometer 210, respectively. The second end of the second resistor R2 and the second test terminal 620 are respectively connected to the first end of the third resistor R3, and the second end of the first resistor R1 is connected to the second end of the third resistor R3.
Specifically, the resistive device under test 50 is connected between the first test terminal 610 and the second test terminal 620. The galvanometer 210 is used to detect whether current is flowing between the second terminal of the first adjustable resistor RX1 and the second terminal of the second adjustable resistor RX 2. The resistance values of the first resistor R1 and the second resistor R2 are equal, and the third resistor R3 is set to a fixed resistance value. In the test process, the first adjustable resistor RX1 and the second adjustable resistor RX2 should be adjusted to the same resistance value at the same time.
When the first bridge test module detects the resistive device 50 to be tested, the control module adjusts the resistance value of the first adjustable resistor RX1, so that the current value displayed by the galvanometer 210 is 0, and the bridge is in a balanced state. In the first bridge test module 20, the resistance value Rx of the resistive device under test satisfies the formula (1):
Figure BDA0003981311720000091
where r is a constant.
Under the condition of RX 1=rx 2, r1=r2, and thus the resistance value RX of the resistive device to be measured satisfies the formula (2):
Figure BDA0003981311720000092
the control module obtains the resistance values of the first adjustable resistor RX1, the first resistor R1 and the third resistor R3 at the moment, and calculates and obtains the first resistance value of the resistor device 50 to be measured according to the formula (2).
In this embodiment, by adjusting the resistance values of the first adjustable resistor and the second adjustable resistor and detecting the galvanometer, the first bridge test module reaches the bridge balance state, and then the first resistance value and the second resistance value are equal, so that the calculation step of the first resistance value can be simplified. Since the resistor can be manufactured with high accuracy, the first resistance value calculated based on the resistance parameter can also be accurate. And the sensitivity of the galvanometer is high, and whether the bridge is in a balanced state after the resistance value of the first adjustable resistor is adjusted can be reflected in time, so that the accurate resistance value of the first adjustable resistor can be obtained in the balanced state of the bridge.
In one embodiment, the control module is further configured to obtain a resistance difference value according to the first resistance value and the second resistance value, and when the difference value is smaller than a preset value, use the first resistance value as the resistance value of the resistive device to be tested.
Specifically, the resistance difference includes a resistance relative error, that is, a ratio of a difference of the first resistance value and the second resistance value to the first resistance value. The accuracy of the test data of the first resistance value is higher than that of the second resistance value, so that the first resistance value is used as the resistance value of the resistor to be tested when the difference value is smaller than a preset value.
For example, the preset value may be set to 1%, and when the resistance relative error is less than 1%, the first resistance value is taken as the resistance value of the resistance device to be measured.
In this embodiment, since the first resistance value and the second resistance value are test data obtained by different test circuits independently, and the test circuit corresponding to the first resistance value is complex, by comparing the resistance difference obtained by the first resistance value and the second resistance value with a preset value, it can be determined whether the test circuit of the first resistance value has a fault according to the comparison result.
In one embodiment, the control module is further configured to obtain a resistance difference value according to the first resistance value and the second resistance value, and output an overhaul prompt signal when the difference value is greater than a preset value.
Specifically, the control module is connected with the display panel of the resistance testing device, and when the difference value is larger than a preset value, the control module controls the display panel to prompt that maintenance information is needed. Optionally, the control module is connected with the buzzer, and the control module controls the buzzer to ring.
In this embodiment, through the output overhauls the prompt signal when the difference is greater than the default, can remind the inspector in time to inspect and maintain resistance testing arrangement.
In one embodiment, as shown in fig. 4, the resistance testing apparatus further comprises a verification module 70, wherein:
the verification module 70 is respectively connected to the first test terminal 610 and the second test terminal 620 of the resistance test device, and is used for detecting the verification internal resistance between the first test terminal 610 and the second test terminal 620. The control module is further connected to the calibration module 70, and is configured to control the calibration module 70 to operate when the resistance difference between the first resistance value and the second resistance value is greater than a preset value, compare the calibration internal resistance with an initial internal resistance of the first bridge test module, and output an alarm signal if the calibration internal resistance is less than the initial internal resistance.
The initial internal resistance is the internal resistance of the resistance test device obtained by connecting the first test terminal 610 and the second test terminal 620 before the resistance test device is first used.
Specifically, in the case where the resistance difference between the first resistance value and the second resistance value is greater than the preset value, the device under test is disconnected from the first test terminal 610 and the second test terminal 620, and the verification module 70 is replaced. And comparing the internal resistance of the first bridge test module with the initial internal resistance, and when the internal resistance of the first bridge test module is smaller than the initial internal resistance, controlling the display panel by the control module to prompt the short-circuit fault information of the internal resistance. Optionally, the control module controls the buzzer to ring.
Illustratively, the verification module 70 is an ohmmeter.
In this embodiment, by comparing the check internal resistance with the initial internal resistance, it is possible to determine whether or not a short-circuit fault occurs in the internal resistance of the resistance test device, and further check the device for faults.
In one embodiment, the control module is further configured to output an off signal when the current value is above the current threshold for a preset period of time. The resistance testing device further comprises an overload protection module which is respectively connected with the first bridge testing module, the volt-ampere testing module and the control module and used for disconnecting a testing passage between the volt-ampere testing module and the resistance device to be tested according to the disconnection signal and disconnecting the testing passage between the first bridge testing module and the resistance device to be tested.
Specifically, the control module outputs a disconnection signal to the overload protection module when the current value is higher than the current threshold for a preset period of time.
Illustratively, the overload protection module includes a current relay.
In this embodiment, through overload protection module, can avoid the electric current that leads to because of the device trouble too high, guarantee resistance test device's safety in utilization.
In one embodiment, as shown in fig. 5, the resistance testing apparatus further includes a second bridge testing module 80 and a switching module 90, wherein:
the second bridge test module 80 is connected to the power module 10 and the resistive device under test 50, respectively.
The switch module 90 is respectively connected to the first bridge test module 20, the second bridge test module 80, the resistive device under test 50, and the control module 40, and is configured to conduct a first bridge test path between the first bridge test module 20 and the resistive device under test 50 in a time-sharing manner under the control of the control module 40 to detect a first resistance value of the resistive device under test 50, and a second bridge test path between the second bridge test module 80 and the resistive device under test 50 to detect a third resistance value of the resistive device under test 50.
Specifically, the switch module 90 includes a plurality of switches that are turned on and off under the control of the control module 40. The first bridge test module 20 and the second bridge test module 80 are connected in parallel.
Specifically, the second bridge test module includes resistance testing based on the single arm bridge principle. Fig. 6 is a circuit diagram of a second bridge test module. As shown in fig. 6, the second bridge test module includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a galvanometer 810. The first ends of the fourth resistor R4 and the fifth resistor R5 are connected to the positive electrode of the power module 10, the second end of the fourth resistor R4 is connected to the first end of the galvanometer 810 and the first end of the sixth resistor R6, the second end of the fifth resistor R5 is connected to the second end of the galvanometer 810 and the first test terminal 610, and the second end of the sixth resistor R6 is connected to the second test terminal 620.
Specifically, during detection, the resistance values of the fourth resistor R4 and the fifth resistor R5 are adjusted to make the bridge in a balanced state, and the current of the galvanometer 810 is 0. Based on the single-arm bridge test principle, the control module obtains resistance values of a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, wherein the third resistance value is a product of a ratio of the fourth resistor R4 to the fifth resistor R5 and the sixth resistor R6.
In this embodiment, by providing the second bridge test module, the corresponding bridge test module can be used according to different resistance value ranges. Through the control of the switch module, the first bridge testing module or the second bridge testing module can be selected according to requirements to conduct resistance testing.
In one embodiment, the power module is further configured to output test electrical signals of different gear under control of the control module, wherein the test electrical signals include at least one of a current signal and a voltage signal.
Specifically, under the resistance values of different resistance devices to be tested, the power module outputs test electric signals of different gears to perform resistance test.
For example, the test currents of different gears can be 5mA, 100mA, 300mA, 1A, 5A and 10A, and the resistors in different resistance value ranges are respectively tested, namely 30 omega-50 kΩ, 500mΩ -60 Ω, 100mΩ -20 Ω, 50mΩ -6 Ω, 1mΩ -0.2 Ω and 500 μΩ -0.1 Ω.
Based on the same inventive concept, the application also provides a resistance testing method.
In one embodiment, as shown in fig. 7, a resistance testing method is provided, which includes the following steps:
s702, a first resistance value of a resistor to be tested is obtained by using a first bridge test module.
Specifically, the first test terminal and the second test terminal are respectively connected with two ends of the resistor device to be tested through the test lead, and the first bridge test module is selected for resistance test. And adjusting the first variable resistor, and under the balanced state of the bridge, acquiring related resistance parameters by the control module, and calculating to acquire a first resistance value of the resistor to be measured.
S704, obtaining a second resistance value of the resistor to be tested according to the current value detected by the volt-ampere test module and the voltage signal provided by the power supply module; the current value is a value flowing through the resistor device to be tested and the power supply module.
Specifically, after the resistance test of the first bridge test module is finished, the resistance device to be tested is connected with the volt-ampere test module through a test interface of the volt-ampere test module. The test interface of the volt-ampere test module comprises a third test terminal and a fourth test terminal. The second resistance value is the ratio of the voltage signal provided by the power supply module to the current value detected by the volt-ampere test module.
S706, determining the resistance value of the resistor to be tested according to the first resistance value and the second resistance value.
Specifically, a resistance difference between the first resistance value and the second resistance value is determined based on the first resistance value and the second resistance value. And when the resistance difference value is smaller than a preset value, setting the first resistance value as the resistance value of the resistor device to be tested. When the resistance difference is larger than a preset value, a detector is prompted to fail the first bridge test module through the display panel and the buzzer.
It should be understood that, although the steps in the flowchart of fig. 7 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 7 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily sequential, but may be performed in rotation or alternatively with at least a portion of the steps or stages in other steps or other steps.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. A resistance testing device, comprising:
the power module is used for providing a test electric signal;
the first bridge testing module is respectively connected with the power supply module and the resistor device to be tested;
the volt-ampere testing module is respectively connected with the power supply module and the resistor device to be tested and is used for detecting the current value flowing through the resistor device to be tested;
the control module is respectively connected with the first bridge test module, the volt-ampere test module and the power supply module and is used for controlling the first bridge test module to test the resistance value of the resistance device to be tested so as to obtain a first resistance value of the resistance device to be tested, obtaining a second resistance value of the resistance device to be tested according to the current value and a voltage signal provided by the power supply module and determining the resistance value of the resistance device to be tested according to the first resistance value and the second resistance value.
2. The resistance testing apparatus according to claim 1, wherein the resistance testing apparatus is configured with a first test terminal for connection with a first end of the resistance device under test and a second test terminal for connection with a second end of the resistance device under test; wherein, the liquid crystal display device comprises a liquid crystal display device,
the positive electrode end of the power supply module is connected with the first test terminal, and the negative electrode end of the power supply module is connected with the second test terminal;
the volt-ampere test module is connected with the power supply module in parallel.
3. The resistance testing device of claim 2, wherein the first bridge testing module comprises: the first resistor, the second resistor, the third resistor, the first adjustable resistor, the second adjustable resistor and the galvanometer; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first end of the first adjustable resistor is connected with the first test terminal, and the second end of the first adjustable resistor is respectively connected with the first end of the first resistor and the first end of the galvanometer;
the first end of the second adjustable resistor is connected with the second test terminal, and the second end of the second adjustable resistor is respectively connected with the first end of the second resistor and the second end of the galvanometer;
the second end of the second resistor and the second test terminal are respectively connected with the first end of the third resistor, and the second end of the first resistor is connected with the second end of the third resistor.
4. The resistance testing apparatus according to claim 1, wherein the control module is further configured to obtain a resistance difference value according to the first resistance value and the second resistance value, and when the difference value is smaller than a preset value, use the first resistance value as the resistance value of the resistive device to be tested.
5. The resistance testing device according to claim 1, wherein the control module is further configured to obtain a resistance difference value according to the first resistance value and the second resistance value, and output an overhaul prompt signal when the difference value is greater than a preset value.
6. The resistance testing device of claim 1, further comprising:
the verification module is respectively connected with a first test terminal and a second test terminal configured by the resistance test device and is used for detecting the verification internal resistance between the first test terminal and the second test terminal;
the control module is further connected with the verification module and is used for controlling the verification module to work under the condition that the resistance difference between the first resistance value and the second resistance value is larger than a preset value, comparing the verification internal resistance with the initial internal resistance of the first bridge test module, and outputting an alarm signal if the verification internal resistance is smaller than the initial internal resistance.
7. The resistance testing device of claim 1, wherein the control module is further configured to output an off signal when the current value is above a current threshold for a predetermined period of time;
the resistance test device further includes:
and the overload protection module is respectively connected with the first bridge testing module, the volt-ampere testing module and the control module and is used for disconnecting a testing passage between the volt-ampere testing module and the resistance device to be tested according to the disconnection signal and disconnecting the testing passage between the first bridge testing module and the resistance device to be tested.
8. The resistance testing device of claim 1, further comprising:
the second bridge testing module is respectively connected with the power supply module and the resistor device to be tested;
the switch module is respectively connected with the first bridge test module, the second bridge test module, the resistance device to be tested and the control module and is used for conducting a first bridge test passage between the first bridge test module and the resistance device to be tested in a time sharing mode under the control of the control module so as to detect a first resistance value of the resistance device to be tested and a second bridge test passage between the second bridge test module and the resistance device to be tested so as to detect a third resistance value of the resistance device to be tested.
9. The resistance testing device of claim 1, wherein the power module is further configured to output test electrical signals of different gear under control of the control module, wherein the test electrical signals include at least one of a current signal and a voltage signal.
10. A method of testing resistance, comprising:
acquiring a first resistance value of a resistor to be tested by using a first bridge test module;
acquiring a second resistance value of the resistor to be tested according to the current value detected by the volt-ampere test module and the voltage signal provided by the power supply module; the current value is a current value flowing through the resistor device to be tested and the power supply module;
and determining the resistance value of the resistor to be measured according to the first resistance value and the second resistance value.
CN202211548968.9A 2022-12-05 2022-12-05 Resistance testing device and resistance testing method Pending CN116125163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211548968.9A CN116125163A (en) 2022-12-05 2022-12-05 Resistance testing device and resistance testing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211548968.9A CN116125163A (en) 2022-12-05 2022-12-05 Resistance testing device and resistance testing method

Publications (1)

Publication Number Publication Date
CN116125163A true CN116125163A (en) 2023-05-16

Family

ID=86301821

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211548968.9A Pending CN116125163A (en) 2022-12-05 2022-12-05 Resistance testing device and resistance testing method

Country Status (1)

Country Link
CN (1) CN116125163A (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809739A (en) * 2012-08-23 2012-12-05 四川电力科学研究院 Method and device for checking storage battery internal resistance tester
CN203949973U (en) * 2014-07-18 2014-11-19 苏州华兴源创电子科技有限公司 A kind of impedance measurement device
CN104977554A (en) * 2014-04-10 2015-10-14 陈书欣 Detection device for storage battery internal resistance tester
CN104977557A (en) * 2015-07-08 2015-10-14 南车青岛四方机车车辆股份有限公司 Device and method for calibrating contact resistance tester
CN206292382U (en) * 2016-12-02 2017-06-30 广东电网有限责任公司汕头供电局 A kind of resistance meter calibrating installation
CN107064642A (en) * 2017-06-23 2017-08-18 东旭科技集团有限公司 Resistivity test device and method
CN108008191A (en) * 2017-11-06 2018-05-08 湖北三江航天万峰科技发展有限公司 A kind of precision aid of Minitype resistance
CN109782070A (en) * 2019-03-08 2019-05-21 大唐东营发电有限公司 A kind of method of PT test short-circuit impedance
CN112394229A (en) * 2021-01-21 2021-02-23 广州思泰信息技术有限公司 Insulation resistance testing device and insulation resistance testing method
CN113702710A (en) * 2020-05-21 2021-11-26 圣邦微电子（北京）股份有限公司 Resistance test circuit and resistance test method
US20210376637A1 (en) * 2020-05-27 2021-12-02 Delta Electronics (Shanghai) Co., Ltd. Battery internal resistance detection device and method
CN217606070U (en) * 2022-04-01 2022-10-18 清陶（昆山）自动化装备有限公司 Calibration device of side voltage and side resistance measuring device

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809739A (en) * 2012-08-23 2012-12-05 四川电力科学研究院 Method and device for checking storage battery internal resistance tester
CN104977554A (en) * 2014-04-10 2015-10-14 陈书欣 Detection device for storage battery internal resistance tester
CN203949973U (en) * 2014-07-18 2014-11-19 苏州华兴源创电子科技有限公司 A kind of impedance measurement device
CN104977557A (en) * 2015-07-08 2015-10-14 南车青岛四方机车车辆股份有限公司 Device and method for calibrating contact resistance tester
CN206292382U (en) * 2016-12-02 2017-06-30 广东电网有限责任公司汕头供电局 A kind of resistance meter calibrating installation
CN107064642A (en) * 2017-06-23 2017-08-18 东旭科技集团有限公司 Resistivity test device and method
CN108008191A (en) * 2017-11-06 2018-05-08 湖北三江航天万峰科技发展有限公司 A kind of precision aid of Minitype resistance
CN109782070A (en) * 2019-03-08 2019-05-21 大唐东营发电有限公司 A kind of method of PT test short-circuit impedance
CN113702710A (en) * 2020-05-21 2021-11-26 圣邦微电子（北京）股份有限公司 Resistance test circuit and resistance test method
US20210376637A1 (en) * 2020-05-27 2021-12-02 Delta Electronics (Shanghai) Co., Ltd. Battery internal resistance detection device and method
CN112394229A (en) * 2021-01-21 2021-02-23 广州思泰信息技术有限公司 Insulation resistance testing device and insulation resistance testing method
CN217606070U (en) * 2022-04-01 2022-10-18 清陶（昆山）自动化装备有限公司 Calibration device of side voltage and side resistance measuring device

Similar Documents

Publication Publication Date Title
CN106997007B (en) Insulation resistance measuring device and method for electric automobile direct-current high-voltage system
CN113447885B (en) Electric energy meter wrong wiring rapid detection circuit and device
CN111505562B (en) Test system for metering performance self-monitoring capability of electric energy meter
CN111781521B (en) Method for detecting storage battery of vehicle and battery detection equipment
CN112946563A (en) Rapid calibration method for three-phase intelligent electric meter and three-phase intelligent electric meter
CN116125163A (en) Resistance testing device and resistance testing method
CN218240380U (en) Battery internal resistance instrument point inspection device
CN215678646U (en) Test system of PWM circuit
CN102466788B (en) Universal meter calibration source
TWI731448B (en) Self-testing system for test device and test method using the same
CN110031774B (en) Online measurement method and device for internal resistance of battery pack
CN113125835A (en) Current precision detection system and detection method and BMS (battery management system)
CN204439820U (en) Once-through type lightning arrester on-Line Monitor Device detector
CN107870298B (en) Circuit parameter detection circuit and method of voltage dividing circuit and electric energy meter
CN208847828U (en) A kind of power supply product tester
CN112526427A (en) Auxiliary inspection device for direct current system of transformer substation
CN112485530A (en) System and method for testing resistance value of high-voltage arm of direct-current voltage transformer
CN111736108A (en) Device for rapidly measuring polarity of current transformer
CN217605972U (en) Impedance measuring device
CN217932031U (en) Electric energy meter field inspection device
CN210123964U (en) Junction box and photovoltaic panel assembly with same
CN216816833U (en) Comprehensive tester for electricity inspection
CN217606069U (en) Calibration device
CN219142977U (en) Detection circuit, device and system
CN220584388U (en) Channel switching device and verification system for verifying multi-channel test equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination