CN112540225B - Testing device for secondary circuit insulation resistance - Google Patents
Testing device for secondary circuit insulation resistance Download PDFInfo
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- CN112540225B CN112540225B CN202011227495.3A CN202011227495A CN112540225B CN 112540225 B CN112540225 B CN 112540225B CN 202011227495 A CN202011227495 A CN 202011227495A CN 112540225 B CN112540225 B CN 112540225B
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- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 238000009413 insulation Methods 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 44
- 238000001514 detection method Methods 0.000 claims description 16
- 230000008676 import Effects 0.000 claims description 4
- 238000007726 management method Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- 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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- 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
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a secondary circuit insulation resistance testing device; the test device comprises: the system comprises a system power supply, a main controller, a CPLD, cable selection and measurement, a battery, a power switch and an interface module; the system power supply is respectively connected with the main controller, the CPLD, the cable selection and measurement and interface module to provide power supply management for the testing device; the battery is respectively connected with the main controller and the system power supply and is used for supplying power to the system power supply; the power switch is connected with a system power supply and used for controlling the system power supply; the main controller is connected with the system power supply, the CPLD, the cable selection and measurement module, the battery and the interface module respectively; the cable selection and measurement are respectively connected with the CPLD and the interface module and are used for receiving data input by the CPLD and exchanging data with the interface module. In the embodiment of the invention, the test time can be shortened, and the working efficiency can be improved.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a secondary circuit insulation resistance testing device.
Background
In relay protection definite inspection and acceptance process, often relate to carrying out insulation resistance test work to the secondary circuit, aim at detecting whether circuit ground insulation is good. At present, due to the lack of direct, effective and rapid measuring tools, cables with low insulation are often searched by unlocking tens to hundreds of cable cores and shaking the cable cores one by one, so that the construction period of fixed inspection and acceptance is prolonged, and labor is wasted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a secondary circuit insulation resistance testing device and a secondary circuit insulation resistance testing method, which can shorten testing time and improve working efficiency.
In order to solve the above technical problems, an embodiment of the present invention provides a secondary circuit insulation resistance testing device, including: the system comprises a system power supply, a main controller, a CPLD, cable selection and measurement, a battery, a power switch and an interface module; wherein,
The system power supply is respectively connected with the main controller, the CPLD, the cable selection and measurement and the interface module to provide power management for the testing device; the battery is respectively connected with the main controller and a system power supply and is used for supplying power to the system power supply;
the power switch is connected with the system power supply and used for controlling the system power supply; the main controller is respectively connected with the system power supply, the CPLD, the cable selection and measurement, the battery and the interface module; the cable selection and measurement are respectively connected with the CPLD and the interface module and are used for receiving data input by the CPLD and exchanging data with the interface module.
Optionally, the main controller includes:
Capacitive screen, CPU, LCD display, USB, RAM, flash and power management; wherein,
The CPU is respectively connected with the capacitive screen, the LCD display, USB, RAM, flash and the power supply management; and the power management is connected with the battery and used for realizing charge and discharge of the battery, battery electric quantity and battery temperature indication management.
Optionally, the CPLD includes a hardware scan keypad and an I/O expansion circuit for performing keypad scan of the test device and providing the I/O expansion circuit.
Optionally, the cable selection and measurement includes a multi-path selection relay switch array, a cable current detection module, a 500V/1000V variable voltage control module and a cable resistance voltage state detection module;
The multi-path selection relay switch array is used for selecting each path of cable measurement; the cable current detection module is used for measuring the cable flowing current; the 500V/1000V variable voltage control module is used for applying voltage to the cable line; the cable resistance voltage state detection module is used for detecting and identifying the state of a cable line before cable measurement.
Optionally, the interface module includes a test interface and a universal interface.
Optionally, the test interface includes a 12-core cable-under-test interface and a ground wire interface.
Optionally, the universal interface includes a DC power port, a USB port, and an ethernet port;
the DC power port is used for externally connecting a power supply to the testing device; the USB port and the Ethernet port are used for data import, export and main control computer software upgrading functions.
In addition, the embodiment of the invention also provides a secondary circuit insulation resistance testing method device, which comprises the following steps when testing is performed, wherein the testing method comprises the following steps:
After the test device is electrified, configuring and initializing a main controller and a CPLD in the test device;
entering a testing interface of the testing device according to the configured and initialized main controller and CPLD, and starting testing;
each cable is scanned one by one through cable selection and measurement of the testing device, and whether the resistance and the voltage on each accessed cable line meet insulation resistance testing conditions or not is checked;
If the serial numbers are in accordance with the serial numbers, marking the serial numbers as testable cable serial numbers, and if the serial numbers are not in accordance with the serial numbers, marking the serial numbers as testable cable serial numbers;
applying test voltage to the cable with the serial number of the testable cable based on the cable selection and measurement, and measuring and calculating the cable resistance value according to the test voltage;
judging whether the cable resistance value accords with a threshold;
if so, the color label of the cable serial number is normal, and if not, the color label of the cable serial number is warned;
judging whether each accessed cable is scanned or not by the cable selection and measurement;
If yes, displaying the color of the cable serial number and the corresponding cable resistance value on an LCD display in the main controller.
In the embodiment of the invention, the secondary circuit insulation resistance is measured by the testing device provided by the invention, so that the time for measuring the resistance can be shortened, the working efficiency of secondary circuit insulation resistance measurement is greatly improved, and the accuracy and the reliability of secondary circuit insulation resistance measurement are also improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a secondary circuit insulation resistance testing device in an embodiment of the invention;
Fig. 2 is a schematic diagram of a test flow of a secondary circuit insulation resistance test method device in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1, fig. 1 is a schematic structural diagram of a secondary circuit insulation resistance testing device according to an embodiment of the invention.
As shown in fig. 1, a secondary circuit insulation resistance testing device includes: the system comprises a system power supply, a main controller, a CPLD, cable selection and measurement, a battery, a power switch and an interface module; the system power supply is respectively connected with the main controller, the CPLD, the cable selection and measurement and the interface module to provide power management for the testing device; the battery is respectively connected with the main controller and a system power supply and is used for supplying power to the system power supply; the power switch is connected with the system power supply and used for controlling the system power supply; the main controller is respectively connected with the system power supply, the CPLD, the cable selection and measurement, the battery and the interface module; the cable selection and measurement are respectively connected with the CPLD and the interface module and are used for receiving data input by the CPLD and exchanging data with the interface module.
Optionally, the main controller includes:
Capacitive screen, CPU, LCD display, USB, RAM, flash and power management; wherein,
The CPU is respectively connected with the capacitive screen, the LCD display, USB, RAM, flash and the power supply management; and the power management is connected with the battery and used for realizing charge and discharge of the battery, battery electric quantity and battery temperature indication management.
Optionally, the CPLD includes a hardware scan keypad and an I/O expansion circuit for performing keypad scan of the test device and providing the I/O expansion circuit.
Optionally, the cable selection and measurement includes a multi-path selection relay switch array, a cable current detection module, a 500V/1000V variable voltage control module and a cable resistance voltage state detection module;
The multi-path selection relay switch array is used for selecting each path of cable measurement; the cable current detection module is used for measuring the cable flowing current; the 500V/1000V variable voltage control module is used for applying voltage to the cable line; the cable resistance voltage state detection module is used for detecting and identifying the state of a cable line before cable measurement.
Optionally, the interface module includes a test interface and a universal interface.
Optionally, the test interface includes a 12-core cable-under-test interface and a ground wire interface.
Optionally, the universal interface includes a DC power port, a USB port, and an ethernet port;
the DC power port is used for externally connecting a power supply to the testing device; the USB port and the Ethernet port are used for data import, export and main control computer software upgrading functions.
In the implementation process of the invention, the testing device comprises a system power supply, a main controller, a CPLD, cable selection and measurement, a battery, a power switch and an interface module; the system power supply is mainly responsible for providing an electric system for the whole testing device, the main power supply consists of 3.3V and 5V, and the stable power supply system is a reliable guarantee of the whole calibrator; the main controller provides a running program Flash space and a memory RAM, is responsible for completing functions of LCD display, a capacitive touch screen, USB and Ethernet interfaces besides external control, and the LCD is mainly used for completing functions of test parameter setting, data management, system setting, software upgrading, help support, version information and the like; the main controller includes: capacitive screen, CPU, LCD display, USB, RAM, flash and power management; the CPU is respectively connected with the capacitive screen, the LCD display, USB, RAM, flash and the power supply management; and the power management is connected with the battery and used for realizing charge and discharge of the battery and indication management of the battery electric quantity and the battery temperature.
The CPLD comprises a hardware scanning keyboard and an I/O expansion circuit, and is mainly used for finishing the scanning of the key keyboard and providing the I/O expansion circuit; the cable selection and measurement multiplexing relay switch array, the cable current detection module, the 500V/1000V variable voltage control module and the cable resistance voltage state detection module; the multi-path selection relay switch array is used for selecting each path of cable measurement; the cable current detection module is used for measuring the cable flowing current; the 500V/1000V variable voltage control module is used for applying voltage to the cable line; the cable resistance voltage state detection module is used for detecting and identifying the state of a cable line before cable measurement.
The interface module comprises a test interface and a universal interface; the test interface comprises a 12-core tested cable interface and a ground wire interface; the universal interface comprises a DC power port, a USB port and an Ethernet port; the DC power port is used for externally connecting a power supply to the testing device; the USB port and the Ethernet port are used for data import, export and main control computer software upgrading functions.
In the embodiment of the invention, the secondary circuit insulation resistance is measured by the testing device provided by the invention, so that the time for measuring the resistance can be shortened, the working efficiency of secondary circuit insulation resistance measurement is greatly improved, and the accuracy and the reliability of secondary circuit insulation resistance measurement are also improved.
Examples
Referring to fig. 2, fig. 2 is a flow chart of a testing method of a secondary circuit insulation resistance testing device according to an embodiment of the invention.
As shown in fig. 2, a secondary circuit insulation resistance testing apparatus performs the following steps when performing a test, the testing method comprising:
S101: after the test device is electrified, configuring and initializing a main controller and a CPLD in the test device;
s102: entering a testing interface of the testing device according to the configured and initialized main controller and CPLD, and starting testing;
s103: each cable is scanned one by one through cable selection and measurement of the testing device, and whether the resistance and the voltage on each accessed cable line meet insulation resistance testing conditions or not is checked;
s104: if the serial numbers are in accordance with the serial numbers, marking the serial numbers as testable cable serial numbers, and if the serial numbers are not in accordance with the serial numbers, marking the serial numbers as testable cable serial numbers;
S105: applying test voltage to the cable with the serial number of the testable cable based on the cable selection and measurement, and measuring and calculating the cable resistance value according to the test voltage;
s106: judging whether the cable resistance value accords with a threshold; if so, the color label of the cable serial number is normal, and if not, the color label of the cable serial number is warned;
s107: judging whether each accessed cable is scanned or not by the cable selection and measurement;
S108: if yes, displaying the color of the cable serial number and the corresponding cable resistance value on an LCD display in the main controller.
Specifically, the task of the novel efficient secondary circuit insulation resistance tester is completed by matching with hardware, after a specific process is electrified, a display screen, a touch screen, an I/O port and a CPLD are firstly configured and initialized, and the secondary circuit insulation resistance tester enters a starting-up state according to set parameters of a user and directly enters a test interface.
When entering the test interface, the user can select the corresponding serial number test cable according to the requirement, or default all serial number cable tests, and the instrument automatically detects the cable line according to the set parameters according to the start test, if the condition can reach the condition which can be tested, the voltage (500V/1000V) is applied to each cable one by one according to the set program, the insulation resistance of each cable is scanned and tested, the test result is displayed on the liquid crystal screen, and meanwhile, the test result is compared with the threshold value, and the cables with the result value lower than or exceeding the threshold are lightened by different colors, so that the user can see clearly.
In the embodiment of the invention, the secondary circuit insulation resistance is measured by the testing device provided by the invention, so that the time for measuring the resistance can be shortened, the working efficiency of secondary circuit insulation resistance measurement is greatly improved, and the accuracy and the reliability of secondary circuit insulation resistance measurement are also improved.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
In addition, the device and the method for testing the secondary circuit insulation resistance provided by the embodiment of the invention are described in detail, and specific examples are adopted to illustrate the principle and the implementation of the invention, and the description of the above examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. A secondary circuit insulation resistance testing device, the testing device comprising: the system comprises a system power supply, a main controller, a CPLD, cable selection and measurement, a battery, a power switch and an interface module; wherein,
The system power supply is respectively connected with the main controller, the CPLD, the cable selection and measurement and the interface module and is used for providing power management for the testing device; the battery is respectively connected with the main controller and a system power supply and is used for supplying power to the system power supply;
The power switch is connected with the system power supply and used for controlling the system power supply; the main controller is respectively connected with the system power supply, the CPLD, the cable selection and measurement, the battery and the interface module; the cable selection and measurement are respectively connected with the CPLD and the interface module and are used for receiving data input by the CPLD and exchanging data with the interface module;
the CPLD comprises a hardware scanning keyboard and an I/O expansion circuit, and is used for finishing the scanning of the key keyboard of the testing device and providing the I/O expansion circuit;
The cable selection and measurement comprises a multi-path selection relay switch array, a cable current detection module, a 500V/1000V variable voltage control module and a cable resistance voltage state detection module;
The multi-path selection relay switch array is used for selecting each path of cable measurement; the cable current detection module is used for measuring the cable flowing current; the 500V/1000V variable voltage control module is used for applying voltage to the cable line; the cable resistance voltage state detection module is used for detecting and identifying the state of a cable line before cable measurement;
When the secondary circuit insulation resistance testing device is used for testing, the following steps are executed:
After the test device is electrified, configuring and initializing a main controller and a CPLD in the test device;
entering a testing interface of the testing device according to the configured and initialized main controller and CPLD, and starting testing;
each cable is scanned one by one through cable selection and measurement of the testing device, and whether the resistance and the voltage on each accessed cable line meet insulation resistance testing conditions or not is checked;
If the serial numbers are in accordance with the serial numbers, marking the serial numbers as testable cable serial numbers, and if the serial numbers are not in accordance with the serial numbers, marking the serial numbers as testable cable serial numbers;
applying test voltage to the cable with the serial number of the testable cable based on the cable selection and measurement, and measuring and calculating the cable resistance value according to the test voltage;
judging whether the cable resistance value accords with a threshold;
If yes, the color standard of the cable serial number is normal; if not, the color label of the cable serial number warns;
judging whether each accessed cable is scanned or not by the cable selection and measurement;
If yes, displaying the color of the cable serial number and the corresponding cable resistance value on an LCD display in the main controller.
2. The test device of claim 1, wherein the main controller comprises:
Capacitive screen, CPU, LCD display, USB, RAM, flash and power management; wherein,
The CPU is respectively connected with the capacitive screen, the LCD display, USB, RAM, flash and the power supply management; and the power management is connected with the battery and used for realizing charge and discharge of the battery, battery electric quantity and battery temperature indication management.
3. The test device of claim 1, wherein the interface module comprises a test interface and a universal interface.
4. A test device according to claim 3, wherein the test interface comprises a 12-core cable-under-test interface and a ground interface.
5. A test device according to claim 3, wherein the universal interface comprises a DC power port, a USB port and an ethernet port;
The DC power port is used for externally connecting a power supply to the testing device; the USB port and the Ethernet port are used for data import, export and realize the software upgrading function of the main control computer.
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| CN113960367A (en) * | 2021-10-29 | 2022-01-21 | 国网湖南省电力有限公司 | A multi-channel secondary cable insulation detection system and its testing method |
| CN115327226B (en) * | 2022-08-01 | 2025-06-27 | 国网河南省电力公司电力科学研究院 | Insulation resistance testing method, system, terminal and storage medium for coiled secondary cable |
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