CN113253079A - Microcomputer type direct current system insulation monitoring test device and method - Google Patents
Microcomputer type direct current system insulation monitoring test device and method Download PDFInfo
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- CN113253079A CN113253079A CN202110760059.0A CN202110760059A CN113253079A CN 113253079 A CN113253079 A CN 113253079A CN 202110760059 A CN202110760059 A CN 202110760059A CN 113253079 A CN113253079 A CN 113253079A
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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
The invention provides a microcomputer type direct current system insulation monitoring test device and method, and belongs to the technical field of transformer substations. The device comprises: switching value collection module, electric volume collection module, control module, adjustable resistance module, alternating voltage output module and test port, wherein switching value collection module, electric volume collection module are used for gathering switching value and electric volume, control module passes through PID controller control adjustable resistance module for the resistance value of resistance value output module output obtains accurate control, still through the output voltage volume of the accurate control alternating voltage output module of voltage regulator in addition. The invention can simultaneously complete insulation monitoring project tests such as bus-to-ground resistance and branch-to-ground resistance tests, direct current channeling tests, alternating current channeling voltage tests and the like, and improves the working efficiency of the insulation monitoring tests of the direct current system.
Description
Technical Field
The invention relates to the technical field of transformer substations, in particular to a microcomputer type direct current system insulation monitoring test device and method.
Background
The direct current system is used as a power supply of automatic control, relay protection and signal devices in an electric power system and a communication system, and the safety and the stability of the electric power and the communication system are directly influenced by the working condition of the direct current system. The direct current grounding caused by insulation damage and the like is the most common fault of a direct current system, and a fault point must be found immediately to be eliminated, otherwise, the misoperation of a load device is easily caused, and the occurrence of accident events and great economic loss are caused. Therefore, in daily operation, the performance of the insulation monitoring device of the direct current system is critical to the stable operation of the direct current system, and the insulation monitoring device of the direct current system is tested regularly, so that the reliable operation of the insulation monitoring device is ensured.
When a transformer substation direct current system is checked and checked, insulation monitoring project tests such as a bus-to-ground resistance test, a branch-to-ground resistance test, a direct current electricity channeling test and an alternating current voltage channeling test need to be performed on the direct current system respectively. This method also has the following problems:
1. when the bus-to-ground resistance test and the branch-to-ground resistance test and the direct current channeling test are carried out, a plurality of resistors with different resistance values from 1k omega to 300k omega are required to be manufactured and carried, and the resistors are respectively connected into a direct current system for testing, so that the wiring is complicated, the work repeatability is high, the human-machine work efficiency is poor, the precision is limited, and meanwhile, the direct current loop is easy to be touched by mistake during operation to cause short circuit, and further accidents such as equipment damage, personal injury and the like are caused.
2. The alternating current channeling test needs to apply different alternating current voltages through a secondary alternating current screen voltage regulator of the transformer substation and access the secondary alternating current screen voltage regulator into a direct current system for testing, the secondary alternating current screen voltage regulator has limited precision and poor testing effect, the testing requirements are difficult to meet, and a special testing instrument is lacked.
Disclosure of Invention
In view of the above, the present invention aims to solve the problems of complex wiring, poor man-machine work efficiency, low precision and poor test effect when the existing method is used for performing insulation detection project tests on a direct current system.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a microcomputer type dc system insulation monitoring test apparatus for performing at least one of a ground resistance test, a dc current channeling test and an ac current channeling test of a dc system of a substation, including:
the device comprises a control module, a switching value acquisition module, an alternating voltage output module, an adjustable resistance module, an electric quantity acquisition module, a resistance quantity output module and a test port;
the output end of the switching value acquisition module is connected with the first input end of the control module and used for acquiring the switching value of the tested equipment and sending the switching value into the control module;
the input end of the alternating voltage output module is connected with the first output end of the control module through a voltage regulator, the output end of the alternating voltage output module is connected with the first port of the test port, the alternating voltage output module is used for outputting the voltage quantity regulated by the voltage regulator through the test port, and the voltage regulator is connected with an external power supply;
the adjustable resistance module is connected with the resistance output module in series, a control end of the adjustable resistance module is connected with a second output end of the control module through a PID controller, an output end of the adjustable resistance module is connected with a second port of the test port, and the resistance output module is used for outputting the resistance adjusted by the adjustable resistance module through the test port;
the output end of the electrical quantity acquisition module is connected with the second input end of the control module, the input end of the electrical quantity acquisition module is connected with the third port of the test port, and the electrical quantity acquisition module is used for acquiring and processing the electrical quantity of the tested loop through the test port;
the control module is used for controlling the output quantity according to the switching value and the electric quantity and generating a test report, and the output quantity is used for adjusting the output voltage quantity by the alternating-current voltage output module and adjusting the output resistance quantity by the adjustable resistance module.
Further, the wiring mode that the test device is used for carrying out when experimental ground resistance specifically includes:
the switching value acquisition module is connected with an alarm hard contact of the insulation monitoring device of the tested direct current system, and the test port is respectively connected with a positive bus of the tested direct current system, a negative bus of the tested direct current system and a common grounding end of the direct current screen.
Further, the mode of connection when test device is used for carrying out direct current and scurries electric test specifically includes:
the switching value acquisition module is connected with an alarm hard contact of the insulation monitoring device of the tested direct current system, and the test port is respectively connected with two sections of buses of the tested direct current system.
Further, the mode of connection when test device is used for carrying out the alternating current and scurries electric test specifically includes:
the switching value acquisition module is connected with an alarm hard contact of the insulation monitoring device of the tested direct current system, and the test port is respectively connected with a positive bus of the tested direct current system, a negative bus of the tested direct current system and a common grounding end of the direct current screen.
Further, the voltage regulator specifically includes:
an adjustable rectifier and an adjustable ac inverter;
the input end of the adjustable rectifier is connected with an external power supply, the output end of the adjustable rectifier is respectively connected with the power supply port of the control module and the input end of the adjustable alternating current inverter, the output end of the adjustable alternating current inverter is connected with the input end of the alternating voltage output module, and the control end of the adjustable alternating current inverter is connected with the first output end of the control module.
Further, the control module specifically includes:
microprocessor, control panel, LCD display screen;
the microprocessor is respectively connected with the switching value acquisition module, the PID controller, the voltage regulator and the electric quantity acquisition module and is used for controlling the output quantity according to the switching value and the electric quantity and generating a test report;
the control panel and the LCD display screen are respectively connected with the microprocessor, and the control panel and the LCD display screen are used for human-computer interaction so that the microprocessor can control the output quantity according to the human-computer interaction instruction.
Further, the control module further comprises:
and the communication module is connected with the microprocessor and is used for information transmission between the test device and external terminal equipment.
Further, the adjustable resistance module specifically includes:
two resistance arrays, two resistance arrays concatenate with resistance output module, and every resistance array all includes the different resistance of a plurality of resistances, and an opto-coupler relay is all connected in parallel to every resistance, and control module passes through the opening and shutting of PID controller control opto-coupler relay to the resistance of control output.
Further, each resistor array comprises a plurality of resistors with different resistance values, and the resistors specifically comprise:
each resistor array includes resistors of 0.1 kilo-ohms, 0.2 kilo-ohms, 0.4 kilo-ohms, 0.8 kilo-ohms, 1 kilo-ohms, 2 kilo-ohms, 4 kilo-ohms, 8 kilo-ohms, 16 kilo-ohms, 32 kilo-ohms, 64 kilo-ohms, 128 kilo-ohms, and 256 kilo-ohms.
In a second aspect, the invention provides a microcomputer type direct current system insulation monitoring test method, which comprises the following steps:
selecting a test item, and executing a corresponding process according to the test item, wherein the test item comprises at least one of the following three tests:
a. the method comprises the following steps of:
judging the voltage grade and polarity of the tested loop;
carrying out a corresponding ground resistance test according to the polarity, and starting to reduce the output resistance according to a first preset step length by using a ground resistance test initial value corresponding to the voltage level;
judging whether the direct current system insulation monitoring device sends out a grounding alarm within a setting value range, and if so, recording the open resistance when the alarm is sent out; if not, recording the grounding alarm abnormity of the insulation monitoring device of the direct current system;
b. the direct current of the direct current system of transformer substation is scurried the electric test, and the direct current is scurried the electric test and is included the following step:
starting from the initial value of the direct current channeling test, reducing the output resistance according to a second preset step length;
judging whether a direct current system insulation detection device sends out a direct current channeling alarm within a setting value range or not, and if so, recording the opening resistance when the alarm is sent out; if not, recording the abnormal direct current channeling alarm of the direct current system insulation monitoring device;
c. the alternating current channeling test of the direct current system of the transformer substation comprises the following steps:
starting to increase the AC voltage according to a third preset step length from the initial value of the AC current fleeing test;
judging whether the direct current system insulation monitoring device sends an alternating current power leakage alarm within a setting value range, and if so, recording the output voltage when the alarm is sent; if not, recording the abnormal alternating current electricity channeling alarm of the insulation monitoring device of the direct current system;
generating a test report according to the recorded data of the test process;
and displaying the test report and uploading the test report to a substation background machine.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a microcomputer type direct current system insulation monitoring test device and method, which respectively collect the switching value and the electrical value of a tested device or a loop by arranging a switching value collection module and an electrical value collection module, respectively control the voltage value output by an alternating current voltage output module through a voltage regulator and control the resistance value output by a resistance value output module through a PID (proportion integration differentiation) controller by a control module according to the collected switching value and the collected electrical value, and realize the accurate setting of a corresponding bus ground resistance test value, a branch ground resistance test value, a direct current channeling resistance test value and an alternating current channeling voltage test value when a ground resistance test or a direct current channeling test or an alternating current channeling test is carried out. Compared with the existing method, the method can simultaneously complete insulation monitoring project tests such as bus-to-ground resistance and branch-to-ground resistance tests, direct current channeling tests, alternating current channeling voltage tests and the like, and improves the working efficiency of the insulation monitoring tests of the direct current system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an insulation monitoring test device of a microcomputer-type direct current system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an insulation monitoring test device of a microcomputer-type direct current system according to an embodiment of the present invention;
fig. 3 is a schematic wiring diagram and an equivalent schematic diagram of a microcomputer-type dc system insulation monitoring test device according to an embodiment of the present invention when performing a dc bus ground resistance test;
fig. 4 is a schematic wiring diagram and an equivalent schematic diagram of a microcomputer-type dc system insulation monitoring test device according to an embodiment of the present invention during a dc current channeling test;
fig. 5 is a schematic wiring diagram and an equivalent schematic diagram of a microcomputer-type direct-current system insulation monitoring test device provided in an embodiment of the present invention when performing an alternating-current channeling test;
fig. 6 is a test flow chart of an insulation monitoring test method for a microcomputer-based dc system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the insulation monitoring test device for a microcomputer-based direct current system of the invention is explained in detail below.
Referring to fig. 1, the present embodiment provides a microcomputer-based insulation monitoring test device for a dc system of a substation, which is used for performing at least one of a ground resistance test, a dc current channeling test and an ac current channeling test of the dc system of the substation, and includes:
the device comprises a control module, a switching value acquisition module, an alternating voltage output module, an adjustable resistance module, an electric quantity acquisition module, a resistance quantity output module and a test port;
the output end of the switching value acquisition module is connected with the first input end of the control module and used for acquiring the switching value of the tested equipment and sending the switching value into the control module.
It should be noted that, the acquisition of the switching value of the device under test is that the switching value acquisition module is connected to the alarm signal hard contact of the insulation monitoring device of the dc system under test, and the alarm signal sent by the insulation monitoring device of the dc system is sent to the control module through the switching value acquisition module, so that the control module executes the corresponding test process according to the alarm signal.
The input end of the alternating voltage output module is connected with the first output end of the control module through the voltage regulator, the output end of the alternating voltage output module is connected with the first port of the test port, the alternating voltage output module is used for outputting the voltage quantity adjusted by the voltage regulator through the test port, and the voltage regulator is connected with an external power supply.
It should be noted that, because the test device needs to output voltage amount when performing the alternating current flashover test, and the device itself does not have a built-in voltage source, a preferable scheme is to connect the voltage regulator with an external power supply, and this scheme has two functions, namely, supplying power to the control module of the test device through the external power supply, and on the other hand, providing output voltage for the test device as the voltage source.
Specifically, a voltage regulator may be provided, which includes an adjustable rectifier and an adjustable ac inverter, wherein an input terminal of the adjustable rectifier is connected to an external power source, an output terminal of the adjustable rectifier is connected to a power port of the control module and an input terminal of the adjustable ac inverter, an output terminal of the adjustable ac inverter is connected to an input terminal of the ac voltage output module, and a control terminal of the adjustable ac inverter is connected to the first output terminal of the control module.
An external power supply supplies power to a control module of the testing device through an adjustable rectifier, the adjustable rectifier is used as a voltage source of an adjustable alternating current inverter to output voltage quantity, the control module controls the adjustable alternating current inverter to adjust the output voltage quantity, and finally, alternating current voltage of 0-251V is obtained through rectification inversion and is used as a testing power supply for alternating current channeling. Furthermore, the voltage regulator can be controlled by a microcomputer, feedback control is carried out through a high-speed 24-bit ADC chip arranged in the microcomputer, the accuracy of output voltage is ensured, continuous output of voltage is realized, and the precision of the voltage regulator can meet the test requirement of alternating current voltage. It can be understood that the specific arrangement of the adjustable rectifier and the adjustable ac inverter inside the voltage regulator may adopt the prior art, subject to the technology that can implement this scheme.
In addition, it can be understood that the test port provided in this embodiment has a plurality of ports, one of which is connected to each module inside the test apparatus, and the other of which is externally connected to a dc system or grounded. The inside of the device can be grounded in a proper mode.
The adjustable resistance module is connected with the resistance output module in series, the control end of the adjustable resistance module is connected with the second output end of the control module through the PID controller, the output end of the adjustable resistance module is connected with the second port of the test port, and the resistance output module is used for outputting the resistance adjusted by the adjustable resistance module through the test port.
It can be understood that, due to the simple algorithm, good robustness and high reliability of the PID control (proportional-integral-derivative control), the PID control adjustable resistance module can be adopted to realize the accurate output of the resistance quantity.
The output end of the electric quantity acquisition module is connected with the second input end of the control module, the input end of the electric quantity acquisition module is connected with the third port of the test port, and the electric quantity acquisition module is used for acquiring and processing the electric quantity of the tested loop through the test port.
It should be noted that the electrical quantity acquisition module acquires the voltage quantity of the dc loop to be tested, and determines the voltage level and the polarity according to the voltage quantity, so that the control module sets a corresponding test value according to the voltage level and the polarity.
The control module is used for controlling the output quantity according to the switching value and the electric quantity and generating a test report, and the output quantity is used for adjusting the output voltage quantity by the alternating-current voltage output module and adjusting the output resistance quantity by the adjustable resistance module.
It should be noted that, in order to enable the tester to perform one-key operation, that is, the tester only selects a corresponding test item, the control module may automatically complete the control of the output quantity, and a test start value of each test item corresponding to the voltage level may be written in the control module in advance. When the control module identifies the corresponding electrical quantity or switching value, the corresponding test initial value can be adopted to start the test.
The embodiment provides a microcomputer type direct current system insulation monitoring test device, which is suitable for collecting relevant test parameters in ground resistance tests, direct current electricity channeling tests and alternating current electricity channeling tests due to the fact that the switching value collecting module and the electrical quantity collecting module are arranged, and output quantity is controlled by the control module according to collected data. In the ground resistance test and the direct current channeling test, the control module controls the size of the adjustable resistor through the PID controller, and then controls the size of the output resistance of the resistance output module, so that the resistance is accurately controlled. In an alternating current channeling test, the control module controls the output voltage quantity through the voltage regulator, and further controls the output voltage quantity of the alternating current voltage output module. Because the device adopts an integrated design, and applies microcomputer acquisition and automatic control technology, the accurate and automatic output of electric quantities such as resistance, alternating current break-in voltage and the like is realized, the working quality of an insulation monitoring test of a direct current system is improved, a detection result can be accurately judged, the safe and reliable operation of the direct current system is ensured, and the power supply reliability of the direct current system is improved.
The above is a detailed explanation of one embodiment of the insulation monitoring test device for the microcomputer-type direct current system according to the present invention, and another embodiment of the insulation monitoring test device for the microcomputer-type direct current system according to the present invention is explained in detail below.
Referring to fig. 2, the present embodiment provides a microcomputer-type dc system insulation monitoring test apparatus, which includes a microprocessor, a control panel, an LCD display screen, a communication module, a switching value acquisition module, an ac voltage output module, an adjustable resistance module, an electrical quantity acquisition module, a resistance quantity output module, and a test port.
And the microprocessor is respectively connected with the switching value acquisition module, the PID controller, the voltage regulator and the electric quantity acquisition module, and is used for controlling the output quantity according to the switching value and the electric quantity and generating a test report.
It can be understood that the function of the microprocessor provided in this embodiment is similar to that of the control module provided in the foregoing embodiment, and the switching value acquisition module, the alternating-current voltage output module, the electrical quantity acquisition module, the resistance output module and the test port are all the same as the corresponding modules provided in the foregoing embodiment, and are not described herein again.
In this embodiment, the control panel and the LCD display are respectively connected to the microprocessor, and the control panel and the LCD display are used for performing human-computer interaction, so that the microprocessor controls the output according to a human-computer interaction instruction.
It should be noted that, in order to realize that the test can be completed by one-key operation of the tester, a control panel and an LCD display screen may be provided, wherein the control panel is provided with corresponding operation buttons, and the LCD display screen may display a function selection menu and a generated test report, so that the tester reads information through the LCD display screen and controls the test process through the buttons on the control panel. The use of a control panel and an LCD display screen to control a microprocessor is well known in the art and will not be described further herein.
In addition, in order to realize information transmission between the device and terminal equipment such as a background machine in a transformer substation, a communication module can be arranged to be connected with the microprocessor, and the communication module can adopt an RS-485 standard.
In this embodiment, the adjustable resistance module specifically can set up to including two resistance arrays, two resistance arrays concatenate with resistance output module, every resistance array all includes the different resistance of a plurality of resistances, an opto-coupler relay is all connected in parallel to every resistance, microprocessor passes through opening and shutting of the corresponding opto-coupler relay of PID controller control, so that the resistance of control output, realize the withdrawal and the access on the loop that concatenates of resistance output module with this opto-coupler relay through controlling every opto-coupler relay closure or disconnection promptly. Preferably, a resistor array consisting of resistors of 0.1k omega, 0.2k omega, 0.4k omega, 0.8k omega, 1k omega, 2k omega, 4k omega, 8k omega, 16k omega, 32k omega, 64k omega, 128k omega and 256k omega is adopted, two thousand different resistance values can be reached at the resistor threshold value of 0-33 k omega according to the permutation and combination principle, and the precision can meet the test requirements of simulating different grounding resistors and channeling resistors of a 220V direct current system and a 110V direct current system.
The embodiment provides a microcomputer type direct current system insulation monitoring test device, through setting up LCD display screen and control panel, can make the tester have a better human-computer interaction with this device in the test process, the tester only needs to select corresponding function menu and control corresponding button and can accomplish different test items on the LCD display screen. In addition, a communication module is further arranged, so that information transmission can be realized between the device and terminal equipment such as a background machine in a transformer substation. Furthermore, the resistors with different resistance values and the optical coupling relay connected with the resistance values in parallel can well meet the resistance test requirements of various test items. Insulation monitoring project tests such as a bus-to-ground resistance test, a branch-to-ground resistance test, a direct current channeling test, an alternating current channeling voltage test and the like can be simultaneously completed.
In addition, the device can also accurately set a bus line to ground resistance test value, a branch line to ground resistance test value, a direct current fleeing resistance test value and an alternating current fleeing voltage test value, can judge whether the insulation monitoring device is normal or not by one-key operation, automatically generates a test report, is convenient for operation of workers and has good man-machine work efficiency. When the direct current system bus or branch circuit ground resistance test is carried out, the device can automatically judge the voltage grade and polarity of the access tested loop and automatically select a corresponding set value for testing.
The above is a detailed explanation of an embodiment of the insulation monitoring test device for the microcomputer-type direct current system of the present invention, and the following is a detailed explanation of the insulation monitoring test method for the microcomputer-type direct current system of the present invention.
Referring to fig. 6, the present embodiment provides an insulation monitoring test method for a microcomputer-based dc system, which is applied to the insulation monitoring test apparatus for a microcomputer-based dc system provided in the foregoing embodiment, and the method includes:
selecting a test item, and executing a corresponding process according to the test item, wherein the test item comprises at least one of three tests: a. a ground resistance test, a direct current electricity channeling test and a c alternating current electricity channeling test;
generating a test report according to the recorded data of the test process;
it should be noted that the recorded data in the test process includes the corresponding open resistance amount and open voltage amount in the test process, which is specifically described in the specific flow of the above three test items.
And displaying the test report and uploading the test report to a substation background machine.
It should be noted that after the test is completed, the microprocessor provided in the foregoing embodiment may generate a test report from the related data recorded during the test process and display the test report on the LCD for the tester to check. In addition, the test report is uploaded to the transformer substation background through the communication module, so that the tester can conveniently check and file the test report.
The specific procedures of the above three tests are described in detail below.
a. Transformer substation DC system ground resistance test (including bus or branch ground resistance test)
1) Wiring mode
Referring to fig. 3, the switching value acquisition module of the microcomputer type dc system insulation monitoring test device is connected to the alarm signal hard contact of the dc system insulation monitoring device, and the test port of the microcomputer type dc system insulation monitoring test device is connected to the positive and negative buses of the dc system and the common ground terminal of the dc screen, respectively. In the test, the microcomputer type direct current system insulation monitoring test device is equivalent to two groups of adjustable resistors controlled by a microprocessor.
The test port of the microcomputer type direct current system insulation monitoring test device is respectively connected with a positive terminal and a negative terminal of a direct current feeder line and a common grounding terminal of a direct current screen.
It can be understood that, when a bus or branch circuit ground resistance test is carried out, the microcomputer type direct current system insulation monitoring test device firstly collects the voltage of the tested loop through the electric quantity collection module, and automatically judges the voltage grade and polarity of the tested loop. In the DC system, the voltage level of the tested loop comprises 220V and 110V, and the polarity is divided into positive polarity and negative polarity.
2) Test procedure
Judging the voltage grade and polarity of the tested loop;
carrying out a corresponding ground resistance test according to the polarity, and starting to reduce the output resistance according to a first preset step length by using a ground resistance test initial value corresponding to the voltage level;
judging whether the direct current system insulation monitoring device sends out a grounding alarm within a setting value range, and if so, recording the open resistance when the alarm is sent out; if not, recording the grounding alarm abnormity of the insulation monitoring device of the direct current system.
It should be noted that, the anode-to-ground resistance test is performed first, the microprocessor controls the adjustable resistance module to start from the initial value of the set corresponding voltage level-to-ground resistance test, the resistance is reduced by a certain step length, and the resistance is output by the resistance output module through the test port, where the test step length should meet the precision requirement of the test. According to the technical specification of a transformer substation direct current power supply system of a southern power grid, the insulation monitoring grounding alarm setting value of a 110V direct current system is 15k omega, and the insulation monitoring grounding alarm setting value of a 220V direct current system is 25k omega. The initial value of the 110V DC system test can be set to be 17k omega, and the initial value of the 220V DC system test can be set to be 28k omega. In addition, the lower limit of the output resistance can be set to be 10k omega, so that the direct current system is prevented from being grounded in the test process, and equipment damage and operation risks are avoided. And then, carrying out a negative electrode ground resistance test, wherein the process and the positive electrode ground resistance test are not repeated herein.
When the ground resistance test is carried out, if the direct current system insulation monitoring device sends out a grounding alarm within a setting value range, an alarm signal enters a microprocessor of the microcomputer type direct current system insulation monitoring test device through a switching value acquisition module, the microprocessor controls an adjustable resistance module to stop adjusting the resistance value, and the open resistance value when the alarm is sent out is recorded. And if the direct current system insulation monitoring device does not send out a grounding alarm within the setting value range, recording the abnormal grounding alarm of the direct current system insulation monitoring device. The setting value range of the grounding alarm of the 110V direct current system can be set to be 15.75k omega-14.25 k omega, and the setting value range of the grounding alarm of the 220V direct current system is set to be 26.25k omega-23.75 k omega.
And then, carrying out a negative electrode ground resistance test, wherein the process and the positive electrode ground resistance test are not repeated herein.
b. Direct current channeling test of direct current system of transformer substation
1) Wiring mode
Referring to fig. 4, the switching value acquisition module is connected to the alarm hard contact of the insulation monitoring device of the dc system to be tested, and the test port is connected to two segments of buses of the dc system to be tested.
It can be understood that in the test, the microcomputer type direct current system insulation monitoring test device is equivalent to two groups of adjustable resistors controlled by a microprocessor.
2) Test procedure
Starting from the initial value of the direct current channeling test, reducing the output resistance according to a second preset step length;
judging whether a direct current system insulation detection device sends out a direct current channeling alarm within a setting value range or not, and if so, recording the opening resistance when the alarm is sent out; if not, recording the abnormal direct current channeling alarm of the direct current system insulation monitoring device.
It should be noted that, when the dc current channeling test is performed, the microprocessor controls the adjustable resistance module to reduce the resistance according to a certain step length from a set dc current channeling test initial value, and the resistance is output by the resistance output module through the test port, where the test step length should meet the test precision requirement. According to the technical specification of a direct current power supply system of a transformer substation of a southern power grid, the setting value of the direct current channeling alarm is 30k omega, and the initial value of the direct current channeling test can be set to be 33k omega. In addition, the lower limit of the output resistance can be set to be 10k omega, so that the short circuit of two sections of buses in the test process of the direct current system is prevented, and equipment damage and operation risks are avoided.
When a direct current channeling test is carried out, if a direct current system insulation monitoring device sends out a direct current channeling alarm within a setting value range, an alarm signal enters a microprocessor of the microcomputer type direct current system insulation monitoring test device through a switching value acquisition module, the microprocessor controls an adjustable resistance module to stop adjusting the resistance, and the output resistance when the alarm is sent out is recorded. And if the direct current system insulation monitoring device does not send out the direct current channeling alarm within the setting value range, recording the direct current channeling alarm abnormity of the direct current system insulation monitoring device. The setting value range of the direct current channeling alarm can be set to be 31.5k omega-28.5 k omega.
c. AC current channeling test of DC system of transformer substation
1) Wiring mode
Referring to fig. 5, the switching value collecting module of the microcomputer type dc system insulation monitoring test device is connected to the alarm signal hard contact of the dc system insulation monitoring device, and when the insulation monitoring device gives an alarm, the switching value collecting module collects the alarm signal and sends the alarm signal to the microprocessor. The test ports of the microcomputer type direct current system insulation monitoring test device are respectively connected with the positive and negative buses of the direct current system and the common grounding end of the direct current screen.
In the test, the insulation monitoring test device of the microcomputer type direct current system is equivalent to two groups of adjustable alternating current voltage sources controlled by the microprocessor.
2) Test procedure
Starting to increase the AC voltage according to a third preset step length from the initial value of the AC current fleeing test;
judging whether the direct current system insulation monitoring device sends an alternating current power leakage alarm within a setting value range, and if so, recording the output voltage when the alarm is sent; if not, recording the abnormal alternating current channeling alarm of the insulation monitoring device of the direct current system.
When the alternating current channeling test is performed, the microprocessor controls the voltage regulator to increase the alternating current voltage according to a certain step length from a set initial value of the alternating current channeling test, the alternating current voltage is output by the alternating current voltage output module through the test port, and the test step length meets the precision requirement of the test. According to the technical specification of a direct-current power supply system of a transformer substation of a southern power grid, the setting value of the alternating-current electricity channeling alarm is 10V, and the initial value of the alternating-current electricity channeling test can be set to be 9V.
When an alternating current channeling test is carried out, if the direct current system insulation monitoring device sends an alternating current channeling alarm within a setting value range, an alarm signal enters a microprocessor of the microcomputer type direct current system insulation monitoring test device through a switching value acquisition module, the microprocessor controls a voltage regulator to stop regulating voltage, and a starting voltage value when the alarm is sent is recorded. And if the direct current system insulation monitoring device does not send out an alternating current channeling alarm in the setting value range, recording the abnormal alternating current channeling alarm of the direct current system insulation monitoring device. The setting value range of the alternating current channeling alarm can be set to be 9.5V-10.5V. Alternatively, the upper limit of the output voltage may be set to 15V to end the ac current flowing test in an appropriate time.
According to the microcomputer type direct current system insulation monitoring test method provided by the embodiment, insulation monitoring project tests such as a bus-to-ground resistance and branch-to-ground resistance test, a direct current channeling test and an alternating current channeling voltage test can be completed, and the work efficiency of the direct current system insulation monitoring test is improved. In addition, the experimental report generated by the method can be conveniently read and filed by workers.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a microcomputer type direct current system insulation monitoring test device for carry out transformer substation's direct current system to ground resistance test, direct current scurry at least one kind in electric test and the alternating current scurry electric test, its characterized in that includes:
the device comprises a control module, a switching value acquisition module, an alternating voltage output module, an adjustable resistance module, an electric quantity acquisition module, a resistance quantity output module and a test port;
the output end of the switching value acquisition module is connected with the first input end of the control module and is used for acquiring the switching value of the tested equipment and sending the switching value into the control module;
the input end of the alternating voltage output module is connected with the first output end of the control module through a voltage regulator, the output end of the alternating voltage output module is connected with the first port of the test port, the alternating voltage output module is used for outputting the voltage quantity regulated by the voltage regulator through the test port, and the voltage regulator is connected with an external power supply;
the adjustable resistance module is connected with the resistance output module in series, a control end of the adjustable resistance module is connected with a second output end of the control module through a PID (proportion integration differentiation) controller, an output end of the adjustable resistance module is connected with a second port of the test port, and the resistance output module is used for outputting the resistance adjusted by the adjustable resistance module through the test port;
the output end of the electrical quantity acquisition module is connected with the second input end of the control module, the input end of the electrical quantity acquisition module is connected with the third port of the test port, and the electrical quantity acquisition module is used for acquiring and processing the electrical quantity of the tested loop through the test port;
the control module is used for controlling an output quantity according to the switching value and the electrical quantity and generating a test report, wherein the output quantity is used for adjusting the output voltage quantity by the alternating current voltage output module and adjusting the output resistance quantity by the adjustable resistance module.
2. The insulation monitoring test device for the microcomputer-type direct current system according to claim 1, wherein a wiring mode of the test device for performing a ground resistance test specifically comprises:
the switching value acquisition module is connected with an alarm hard contact of the insulation monitoring device of the tested direct current system, and the test port is respectively connected with a positive bus of the tested direct current system, a negative bus of the tested direct current system and a public grounding end of the direct current screen.
3. The insulation monitoring test device for the microcomputer-type direct current system according to claim 1, wherein a wiring mode of the test device for performing a direct current channeling test specifically comprises:
the switching value acquisition module is connected with an alarm hard contact of the insulation monitoring device of the tested direct current system, and the test port is respectively connected with two sections of buses of the tested direct current system.
4. The insulation monitoring test device for the microcomputer-type direct-current system according to claim 1, wherein a wiring mode when the test device is used for performing an alternating-current electricity channeling test specifically comprises:
the switching value acquisition module is connected with an alarm hard contact of the insulation monitoring device of the tested direct current system, and the test port is respectively connected with a positive bus of the tested direct current system, a negative bus of the tested direct current system and a public grounding end of the direct current screen.
5. The microcomputer type direct current system insulation monitoring test device according to claim 1, wherein the voltage regulator specifically comprises:
an adjustable rectifier and an adjustable ac inverter;
the input end of the adjustable rectifier is connected with the external power supply, the output end of the adjustable rectifier is respectively connected with the power port of the control module and the input end of the adjustable alternating current inverter, the output end of the adjustable alternating current inverter is connected with the input end of the alternating voltage output module, and the control end of the adjustable alternating current inverter is connected with the first output end of the control module.
6. The insulation monitoring test device for the microcomputer-type direct current system according to claim 1, wherein the control module specifically comprises:
microprocessor, control panel, LCD display screen;
the microprocessor is respectively connected with the switching value acquisition module, the PID controller, the voltage regulator and the electrical value acquisition module, and is used for controlling the output quantity according to the switching value and the electrical value and generating the test report;
the control panel and the LCD display screen are respectively connected with the microprocessor, and the control panel and the LCD display screen are used for human-computer interaction so that the microprocessor can control the output quantity according to a human-computer interaction instruction.
7. The insulation monitoring test device of the microcomputer-based direct current system according to claim 6, wherein the control module further comprises:
and the communication module is connected with the microprocessor and is used for information transmission between the test device and external terminal equipment.
8. The insulation monitoring test device for the microcomputer-type direct current system according to claim 1, wherein the adjustable resistance module specifically comprises:
the two resistor arrays are connected with the resistance output module in series, each resistor array comprises a plurality of resistors with different resistances, each resistor is connected with an optocoupler relay in parallel, and the control module controls the on and off of the optocoupler relays through the PID controller so as to control the output resistance.
9. The insulation monitoring test device for the microcomputer-type direct current system according to claim 8, wherein each resistor array comprises a plurality of resistors with different resistance values, and the resistor array specifically comprises:
each of the resistor arrays includes resistors of 0.1 kilo-ohms, 0.2 kilo-ohms, 0.4 kilo-ohms, 0.8 kilo-ohms, 1 kilo-ohms, 2 kilo-ohms, 4 kilo-ohms, 8 kilo-ohms, 16 kilo-ohms, 32 kilo-ohms, 64 kilo-ohms, 128 kilo-ohms, and 256 kilo-ohms.
10. A microcomputer type direct current system insulation monitoring test method is characterized by comprising the following steps:
selecting a test item, and executing a corresponding process according to the test item, wherein the test item comprises at least one of the following three tests:
a. the method comprises the following steps of:
judging the voltage grade and polarity of the tested loop;
carrying out a corresponding ground resistance test according to the polarity, and starting to reduce the output resistance according to a first preset step length by using a ground resistance test initial value corresponding to the voltage level;
judging whether the direct current system insulation monitoring device sends out a grounding alarm within a setting value range, and if so, recording the open resistance when the alarm is sent out; if not, recording the grounding alarm abnormity of the insulation monitoring device of the direct current system;
b. the direct current of direct current system of transformer substation scurries the electric test, direct current scurries the electric test and includes the following step:
starting from the initial value of the direct current channeling test, reducing the output resistance according to a second preset step length;
judging whether a direct current system insulation detection device sends out a direct current channeling alarm within a setting value range or not, and if so, recording the opening resistance when the alarm is sent out; if not, recording the abnormal direct current channeling alarm of the direct current system insulation monitoring device;
c. the alternating current electricity channeling test of the direct current system of the transformer substation comprises the following steps:
starting to increase the AC voltage according to a third preset step length from the initial value of the AC current fleeing test;
judging whether the direct current system insulation monitoring device sends an alternating current power leakage alarm within a setting value range, and if so, recording the output voltage when the alarm is sent; if not, recording the abnormal alternating current electricity channeling alarm of the insulation monitoring device of the direct current system;
generating a test report according to the information for executing the test item record;
and displaying the test report and uploading the test report to a substation background machine.
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