Automatic insulation resistance test system and method and storage medium

Abstract

The invention provides an automatic insulation resistance test system comprising a programmable high-voltage power supply used for outputting a preset test voltage; the relay switch matrix comprises a plurality of relay switches so as to automatically switch different measuring loops for testing in sequence under the control of the processor; the processor is connected with the programmable high-voltage power supply and the relay switch matrix, and is used for controlling the output of the high-voltage power supply and the switching of the relay matrix, receiving and processing the measurement data and calculating the insulation resistance value of the measurement loop; and the measuring module is connected between the programmable high voltage and the relay switch matrix, and is used for acquiring the voltage of the sampling resistor after the programmable high voltage power supply is applied to the selected measuring loop and the high voltage is stable. The invention further discloses a corresponding method and a storage medium. According to the invention, automatic insulation resistance testing can be carried out on multiple groups of measuring loops, repeated wiring is not needed, and the testing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation testing of secondary relay protection substations, and in particular to an automated insulation resistance testing system, method and storage medium. Background Art

[0002] At present, before a new substation is put into operation or after replacing equipment, it is necessary to conduct insulation tests on each circuit in the substation to ensure safety. There are many circuits in the substation, but the insulation meter currently used can only test a single electrical circuit. It is time-consuming and labor-intensive to complete the insulation test of all electrical circuits in the entire substation, and the test efficiency is very low. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an automated insulation resistance testing system, method and storage medium, which can realize automated insulation resistance testing of multiple groups of measurement circuits and improve testing efficiency.

[0004] In order to solve the above technical problems, as a first aspect of the present invention, an automated insulation resistance test system is provided, which at least includes a processor, a programmable high voltage power supply, a relay switch matrix, a measurement module and a display module, wherein:

[0005] Programmable high-voltage power supply for outputting preset test voltage;

[0006] A relay switch matrix, one end of which is connected to a plurality of circuits to be measured and the other end of which is connected to a measuring module, comprising a plurality of relay switches, each of which is configured to connect or disconnect a specific measuring circuit, so as to automatically switch different measuring circuits in sequence for testing under the control of a processor;

[0007] A processor, connected to the programmable high-voltage power supply and the relay switch matrix, for controlling the output of the high-voltage power supply and the switching of the relay matrix, as well as receiving and processing measurement data, and calculating the insulation resistance value of the measurement loop;

[0008] A measuring module connected between the programmable high voltage and the relay switch matrix, for measuring the voltage across the sampling resistor contained therein after the programmable high voltage power supply is applied to the selected measurement loop and the high voltage is stable, and returning the voltage to the processor;

[0009] Display module, used to display measurement results and test status in real time.

[0010] Preferably, it also includes:

[0011] A programmable operational amplifier (PGA), connected to the measurement module, is used to amplify the measurement signal and switch gears to improve the measurement accuracy;

[0012] The analog-to-digital conversion module is arranged between the programmable operational amplifier and the processor, and is used for performing analog-to-digital conversion of signals.

[0013] Preferably, it further comprises:

[0014] The alarm module is used to issue an audible and visual alarm after the test is completed.

[0015] Preferably, in the relay switch matrix, the substation secondary voltage and current loop signals A, B, C, and N are respectively connected to the output positive pole of the programmable high-voltage power supply through a relay; the loop signals B, C, N and the casing ground E are respectively connected to the output negative pole of the programmable high-voltage power supply through a relay.

[0016] Preferably, the processor sends a control signal to a relay switch matrix, and utilizes the on and off of each relay therein to achieve the switching of the measurement circuit.

[0017] Accordingly, as another aspect of the present invention, there is also provided an automated insulation resistance testing method, which is implemented by the aforementioned system, and the method comprises at least the following steps:

[0018] The test parameters are set through the processor, including the output voltage of the high voltage power supply and the circuit to be measured;

[0019] Start the test, control the programmable high voltage power supply to output the test voltage, and switch to the first measurement loop through the relay switch matrix;

[0020] Monitor whether the high-voltage power supply output is stable. After it is stable, measure the voltage across the sampling resistor and calculate the insulation resistance value.

[0021] Turn off the high-voltage test power supply, and after the monitoring voltage drops to a safe range, switch to the next measurement circuit through the relay switch matrix for testing;

[0022] Repeat the above steps until all preset measurement loops are tested;

[0023] The test results are displayed and whether the test is passed is determined based on the preset conditions. An audible and visual alarm is issued after the test is completed.

[0024] Preferably, it further comprises:

[0025] After receiving the measurement data and calculating the insulation resistance value, the processor displays the result on the display and alarm unit.

[0026] Preferably, it further comprises:

[0027] A programmable operational amplifier (PGA) is used to amplify the measurement signal to improve the measurement accuracy.

[0028] Preferably, the processor controls the on and off of each relay in the relay switch matrix by sending a control signal to the relay switch matrix to achieve the switching of the measurement circuit.

[0029] As another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the aforementioned method are implemented.

[0030] The implementation of the embodiments of the present invention has the following beneficial effects:

[0031] The present invention provides an automated insulation resistance testing system, method and storage medium. By setting multiple groups of measurement circuits at the beginning of the test and utilizing the cooperation between a relay switch matrix, a processor and a measurement module during the test, automated insulation resistance testing of the multiple groups of measurement circuits can be achieved without multiple wirings, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0033] Figure 1 A structural schematic diagram of an embodiment of an automated insulation resistance testing system provided by the present invention;

[0034] Figure 2 A schematic diagram of the principle of the automated insulation resistance test involved in the present invention;

[0035] Figure 3 It is a structural schematic diagram of a relay switch matrix involved in the present invention;

[0036] Figure 4 A schematic diagram of a process flow of an embodiment of an automated insulation resistance testing method provided by the present invention. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 FIG. 1 is a schematic diagram showing a structure of an embodiment of an automated insulation resistance test system provided by the present invention. Figure 2 and Figure 3As shown, in this embodiment, the automated insulation resistance test system includes at least a processor, a programmable high voltage power supply, a relay switch matrix, a measurement module and a display module, wherein:

[0039] The programmable high-voltage power supply is used to output a preset test voltage; specifically, at the beginning of the test, the output voltage of the programmable high-voltage power supply can be set, and the circuit to be measured can be configured. Figure 1 As shown, the 'setting' operation can be completed through the "button, display" module in the figure, and the programmable high-voltage power supply is controlled by a digital-to-analog converter module (DAC) connected to the processor; Figure 2 In the figure, “+HV” is the high voltage supply voltage of the programmable high voltage power supply, RL is the circuit under test, and RS is the sampling resistor.

[0040] A relay switch matrix, one end of which is connected to a plurality of circuits to be measured through an input terminal, and one end of which is connected to a measuring module, includes a plurality of relay switches, each of which is configured to connect or disconnect a specific measuring circuit, so as to automatically switch different measuring circuits for testing in sequence under the control of a processor; it is understandable that when a user presses a "start" test button (the "start" button is present on the display key module), the relay switch matrix also needs to be configured at the location where the programmable high-voltage power supply output voltage is configured, and the switch combination corresponding to the relay switch matrix is ​​controlled by directly driving the relay through the IO port of the processor;

[0041] A processor, connected to the programmable high-voltage power supply and the relay switch matrix, for controlling the output of the high-voltage power supply and the switching of the relay matrix, as well as receiving and processing measurement data, and calculating the insulation resistance value of the measurement loop;

[0042] A measuring module connected between the programmable high voltage and the relay switch matrix, for measuring the voltage across the sampling resistor contained therein after the programmable high voltage power supply is applied to the selected measurement loop and the high voltage is stable, and returning the voltage to the processor;

[0043] Display module, used to display measurement results and test status in real time.

[0044] Specifically, Figure 2 , Figure 3As shown, in the relay switch matrix, the input terminals A, B, C, and N corresponding to the secondary voltage and current loop signals of the substation are connected to the output positive electrode of the programmable high-voltage power supply through a relay respectively; the input terminals B, C, and N corresponding to the loop signals and the chassis ground E are connected to the output negative electrode of the programmable high-voltage power supply through a relay respectively. Specifically, terminal A is connected to the output positive electrode through relay K1, terminal B is connected to the output positive electrode through relay K2, terminal C is connected to the output positive electrode through relay K3, and terminal N is connected to the output negative electrode through relay K4; and terminal B is connected to the output negative electrode through relay K6, terminal C is connected to the output negative electrode through relay K7, terminal N is connected to the output negative electrode through relay K8, and terminal E is connected to the output negative electrode through relay K5. Figure 3 The "+" and "-" signs are Figure 2 The two ends of RL in the measurement principle diagram, that is, the relay switch matrix is ​​connected to the secondary voltage and current loop of the substation to replace Figure 2 RL in.

[0045] The processor realizes the switching of the measurement circuit by sending a control signal to the relay switch matrix and using the on and off of each relay therein. Specifically, by controlling K1 and K5 to be connected and other relays to be disconnected, the AE measurement circuit can be selected; by controlling K2 and K5 to be connected and other relays to be disconnected, the BE measurement circuit can be selected; by controlling K3 and K5 to be connected and other relays to be disconnected, the CE measurement circuit can be selected; by controlling K4 and K5 to be connected and other relays to be disconnected, the NE measurement circuit can be selected; by controlling K1 and K6 to be connected and other relays to be disconnected, the AB measurement circuit can be selected; by controlling K1 and K7 to be connected and other relays to be disconnected, the AC measurement circuit can be selected; by controlling K1 and K8 to be connected and other relays to be disconnected, the AN measurement circuit can be selected; by controlling K2 and K7 to be connected and other relays to be disconnected, the BC measurement circuit can be selected; by controlling K2 and K8 to be connected and other relays to be disconnected, the BN measurement circuit can be selected; by controlling K3 and K8 to be connected and other relays to be disconnected, the CN measurement circuit can be selected.

[0046] Furthermore, the system of the present invention also includes:

[0047] A programmable operational amplifier (PGA) is connected to the measurement module and is used to amplify the measurement signal and switch gears to improve the measurement accuracy; the PGA (programmable operational amplifier) ​​here is to improve the measurement accuracy within a large measurement range and to automatically switch gears according to the actual input measurement voltage to improve the measurement accuracy.

[0048] The analog-to-digital conversion module is arranged between the programmable operational amplifier and the processor, and is used for performing analog-to-digital conversion of the signal; specifically, the analog signal after signal amplification by the PGA is converted into a digital signal by the analog-to-digital converter and provided to the processor for measurement and calculation.

[0049] The alarm module is used to issue an audible and visual alarm after the test is completed.

[0050] It can be understood that the programmable high-voltage power supply is turned on through the internal program control of the processor, and the measurement circuit monitors the voltage value output by the programmable high-voltage power supply. When the programmable high-voltage power supply reaches the preset value and stabilizes, the measurement circuit starts to measure the voltage across the sampling resistor RS. This is used to calculate the current value of the measurement circuit. Thus, the insulation resistance value measurement of one of the circuits is completed.

[0051] In order to switch the relay to the next measurement safely, the programmable high-voltage power supply must be turned off first, and the measurement loop must be used to monitor whether the voltage across the programmable high-voltage power supply has dropped to a safe range. When the voltage of the high-voltage power supply drops to a safe range, the relay matrix switches to the next measurement loop. A new round of loop insulation resistance measurement begins. On the display interface, after each loop is measured, the measured insulation resistance value will be displayed, and whether the test has passed will be displayed based on the preset insulation resistance judgment conditions. When all measurement loops are completed, the device stops measuring and sounds an audible and visual alarm.

[0052] In the embodiment of the present invention, up to ten measurement loops can be measured at one time. Only one wiring operation and setting of the measurement loop are required before the measurement starts, and automatic measurement can be realized. In the current common insulation test loop measurement mode, up to ten wiring and measurement operations are required. The present invention can greatly improve the efficiency of insulation testing.

[0053] like Figure 4 As another aspect of the present invention, an automated insulation resistance test method is also provided, which uses the above Figures 1 to 3 The method is implemented by the system described above, and the method comprises at least the following steps:

[0054] Set the test parameters through the processor, including the output voltage of the high-voltage power supply and the circuit to be measured; specifically, after clicking "Start", you can set the output voltage and select the measurement circuit (A, B, C, D, N, etc.);

[0055] Start the test, control the programmable high voltage power supply to output the test voltage, and switch to the first measurement loop through the relay switch matrix;

[0056] Monitor whether the high-voltage power supply output is stable. After it is stable, measure the voltage across the sampling resistor and calculate the insulation resistance value; and display the result on the display and alarm unit;

[0057] Turn off the high-voltage test power supply, and after the monitoring voltage drops to a safe range, switch to the next measurement circuit through the relay switch matrix for testing;

[0058] Repeat the above steps until all preset measurement loops are tested;

[0059] The test results are displayed and whether the test is passed is determined based on the preset conditions. An audible and visual alarm is issued after the test is completed.

[0060] The method further comprises:

[0061] A programmable operational amplifier (PGA) is used to amplify the measurement signal to improve the measurement accuracy.

[0062] The processor controls the on and off of each relay in the relay switch matrix by sending a control signal to the relay switch matrix to achieve the switching of the measurement circuit.

[0063] For more details, please refer to and combine the above Figures 1 to 3 The description is not repeated here.

[0064] As another aspect of the present invention, there is also provided a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the above-mentioned Figure 4 For more details, please refer to and combine the above Figure 4 The description is not repeated here.

[0065] The implementation of the embodiments of the present invention has the following beneficial effects:

[0066] The present invention provides an automated insulation resistance testing system, method and storage medium. By setting multiple groups of measurement circuits at the beginning of the test and utilizing the cooperation between a relay switch matrix, a processor and a measurement module during the test, automated insulation resistance testing of the multiple groups of measurement circuits can be achieved without multiple wirings, thereby improving the test efficiency.

[0067] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0068] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0069] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An automated insulation resistance testing system, characterized in that: It at least includes a processor, a programmable high voltage power supply, a relay switch matrix, a measurement module and a display module, wherein: Programmable high-voltage power supply for outputting preset test voltage; A relay switch matrix, one end of which is connected to a plurality of circuits to be measured and the other end of which is connected to a measuring module, comprising a plurality of relay switches, each of which is configured to connect or disconnect a specific measuring circuit, so as to automatically switch different measuring circuits in sequence for testing under the control of a processor; A processor, connected to the programmable high-voltage power supply and the relay switch matrix, for controlling the output of the high-voltage power supply and the switching of the relay matrix, as well as receiving and processing measurement data, and calculating the insulation resistance value of the measurement loop; A measuring module connected between the programmable high voltage and the relay switch matrix, for measuring the voltage across the sampling resistor contained therein after the programmable high voltage power supply is applied to the selected measurement loop and the high voltage is stable, and returning the voltage to the processor; Display module, used to display measurement results and test status in real time.

2. The system according to claim 1, characterized in that Also includes: A programmable operational amplifier (PGA), connected to the measurement module, is used to amplify the measurement signal and switch gears to improve the measurement accuracy; The analog-to-digital conversion module is arranged between the programmable operational amplifier and the processor, and is used for performing analog-to-digital conversion of signals.

3. The system according to claim 1, characterized in that Further including: The alarm module is used to issue an audible and visual alarm after the test is completed.

4. The system according to claim 3, characterized in that In the relay switch matrix, the substation secondary voltage and current loop signals A, B, C, and N are each connected to the output positive pole of the programmable high-voltage power supply through a relay; the loop signals B, C, N and the casing ground E are each connected to the output negative pole of the programmable high-voltage power supply through a relay.

5. The system according to claim 4, characterized in that The processor sends a control signal to the relay switch matrix, and utilizes the on and off of each relay therein to implement the switching of the measurement circuit.

6. An automated insulation resistance testing method, characterized in that: The method is implemented by the system according to any one of claims 1 to 5, wherein the method comprises at least the following steps: The test parameters are set through the processor, including the output voltage of the high voltage power supply and the circuit to be measured; Start the test, control the programmable high voltage power supply to output the test voltage, and switch to the first measurement loop through the relay switch matrix; Monitor whether the high-voltage power supply output is stable. After it is stable, measure the voltage across the sampling resistor and calculate the insulation resistance value. Turn off the high-voltage test power supply, and after the monitoring voltage drops to a safe range, switch to the next measurement circuit through the relay switch matrix for testing; Repeat the above steps until all preset measurement loops are tested; The test results are displayed and whether the test is passed is determined based on the preset conditions. An audible and visual alarm is issued after the test is completed.

7. The method according to claim 6, characterized in that Further including: After receiving the measurement data and calculating the insulation resistance value, the processor displays the result on the display and alarm unit.

8. The method according to claim 7, characterized in that Further including: A programmable operational amplifier (PGA) is used to amplify the measurement signal to improve the measurement accuracy.

9. The method according to claim 8, characterized in that The processor controls the on and off of each relay in the relay switch matrix by sending a control signal to the relay switch matrix to achieve the switching of the measurement circuit.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 6 to 9 are implemented.

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