CN113671324B - Automatic testing device and method for testing performance of medium-low voltage distribution board - Google Patents
Automatic testing device and method for testing performance of medium-low voltage distribution board Download PDFInfo
- Publication number
- CN113671324B CN113671324B CN202110928951.5A CN202110928951A CN113671324B CN 113671324 B CN113671324 B CN 113671324B CN 202110928951 A CN202110928951 A CN 202110928951A CN 113671324 B CN113671324 B CN 113671324B
- Authority
- CN
- China
- Prior art keywords
- module
- interface
- testing
- operational amplifier
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 226
- 238000000034 method Methods 0.000 title claims description 14
- 238000009413 insulation Methods 0.000 claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims description 21
- 239000011159 matrix material Substances 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000000875 corresponding effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- 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
-
- 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
-
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention relates to an automatic testing device for testing the performance of a medium-low voltage distribution board, which comprises a resistance testing module, an insulation voltage withstand testing module and an interface module, wherein the interface module comprises a switching unit and a first interface and a second interface matched with the switching unit; the first interface is used for connecting input interfaces of the first device and the second device, the second interface is respectively connected with the insulation voltage resistance test module and the resistance test module, and the switching unit is used for controlling on-off of electrical connection between the first interface and the second interface; and the control device is respectively connected with the interface module, the insulation voltage resistance test module and the resistance test module to control the work of the interface module, the insulation voltage resistance test module and the resistance test module and perform data transmission. The circuit is designed in a modularized mode, the operation of an electric switch in a test program and each checking test step can be automatically completed, the disassembling and wiring difficulty and the testing risk are reduced compared with the traditional technology, and the overhaul efficiency is improved.
Description
Technical Field
The invention relates to the technical field of automatic testing of distribution boards, in particular to an automatic testing device and a testing method for testing the performance of a medium-low voltage distribution board.
Background
The medium-low voltage distribution board is electric equipment for centralizing, switching and distributing electric energy; it is generally composed of a cabinet body, an electric switch (circuit breaker), a protection device, a monitoring device, an electric energy meter and other secondary components, and is installed in a power station.
At present, based on the inspection standard formulated in the aspects of protection and function of electric equipment by a power station, the operation test of a switch of a middle-low voltage distribution board is carried out in a cabinet bin on site, and meanwhile, whether the switch opening and closing action function is normal is judged by measuring a switch auxiliary node. The test method involves a large number of disconnection wires, so that risks of direct current loop short circuit, wrong grounding, wrong wire connection and the like exist, and the secondary terminal position of the cabinet bin is measured for a plurality of times in the test process; because of narrow space and dense wiring, signal measurement is extremely difficult, and has the hidden troubles of large false collision, false measurement, short circuit, grounding and the like.
Disclosure of Invention
The invention aims to solve the technical problems that the wiring is complex, the wiring is easy to make mistakes and the like in the existing test of the performance of a middle-low voltage distribution board, and provides an automatic test device and a test method for testing the performance of the middle-low voltage distribution board.
The technical scheme adopted for solving the technical problems is as follows: an automatic test equipment for testing the performance of medium-low voltage distribution board is composed of
The resistance test module is used for testing the resistance of the first device in the middle-low voltage distribution board;
the insulation voltage withstand test module is used for testing insulation and/or voltage withstand degree of the second device in the medium-low voltage distribution board;
the interface module comprises a switching unit and a first interface and a second interface matched with the switching unit; the first interface is provided with a plurality of ports which are respectively used for connecting input interfaces of the first device and the second device, the second interface is respectively connected with the insulation voltage resistance test module and the resistance test module, and the switching unit is used for controlling on-off of the electrical connection between the first interface and the second interface;
and the control device is respectively connected with the interface module, the insulation voltage resistance test module and the resistance test module to control the work of the interface module, the insulation voltage resistance test module and the resistance test module and perform data transmission.
Preferably, the resistance test module comprises a current output module and a voltage acquisition module, wherein the current output module can be used for adjusting and outputting stable current;
the current output module is connected with the first device to output stable current to the first device; the voltage acquisition module is respectively connected with two ends of the first device.
Preferably, the current output module comprises a power unit for outputting a voltage source, a sampling resistor RS for playing a feedback role, a first differential comparison circuit unit, a second differential comparison circuit unit, an isolation unit and a pulse width modulator;
the positive end and the negative end of the power unit are respectively and electrically connected with the input end of the first differential comparison circuit unit, the output port of the first differential comparison circuit unit is connected with the input end of the pulse width modulator through the isolation unit, and the output end of the pulse width modulator is connected with the power unit;
the positive electrode end of the power unit is connected with the first end of the first device, and the second end of the first device is connected with the negative electrode end of the current output module after being connected with the sampling resistor RS in series; and two ends of the sampling resistor RS are respectively connected with the input end of the second differential comparison circuit unit, and the output end of the second differential comparison circuit unit is connected with the first differential comparison circuit unit.
Preferably, the second differential comparison circuit unit includes a third operational amplifier U3, a fourth operational amplifier U4, a first resistor R1 and a first diode D1; the first end of the sampling resistor RS is connected with the negative output end of the power unit and is connected with the inverting input end of the third operational amplifier U3, the second end of the sampling resistor RS is connected with the non-inverting input end of the third operational amplifier U3, the output end of the third operational amplifier U3 is connected with the inverting input end of the fourth operational amplifier U4, the positive input end of the fourth operational amplifier U4 is connected with the reference voltage Vr2, the output end of the fourth operational amplifier U4 is connected with the cathode of the first diode D1, and the anode of the first diode D1 is connected to the first differential comparison circuit unit through the first resistor R1;
the first differential comparison circuit unit comprises a first operational amplifier U1, a second operational amplifier U2 and a second resistor R2, wherein the negative output end of the power unit is connected with the inverting input end of the first operational amplifier U1, the positive output end of the power unit is connected with the non-inverting input end of the first operational amplifier U1, the output end of the first operational amplifier U1 is connected with the inverting input end of the second operational amplifier U2, and the non-inverting input end of the second operational amplifier U2 is respectively connected with the first ends of the first resistor R1 and the second resistor R2; the second end of the resistor R2 is grounded; the output end of the second operational amplifier U2 is connected with the pulse width modulator through the isolation unit.
Preferably, the insulation voltage withstand test module comprises a second controller, a digital-to-analog converter, an amplifying circuit and a boosting rectifying circuit;
the first end of the second controller is connected with the control device, the second end of the second controller is connected with the amplifying circuit through the digital-to-analog converter, and the third end of the second controller is connected with the boosting rectifying circuit; the amplifying circuit is also connected with the boosting rectifying circuit.
The control device controls the second controller to generate a digital signal, and the digital signal passes through the digital-to-analog converter, the amplifying circuit and the boost rectifying circuit and then outputs a high-voltage signal to the second device.
Preferably, the switching unit comprises a relay matrix; the relay matrix is electrically connected between the first interface and the second interface.
Preferably, the control device comprises an upper computer, and the upper computer is electrically or communicatively connected with the resistance test module, the insulation voltage test module and the interface module and is used for sending control signals to the interface module.
Preferably, the first device includes a contact resistor, a loop resistor or a coil winding provided in the medium-low voltage distribution board.
The automatic testing device for testing the performance of the medium-low voltage distribution board is adopted;
the test method for testing the performance of the medium-low voltage distribution board comprises the following steps:
s10: acquiring an external control signal;
s20: the interface module enables the switching unit to correspondingly control on-off of the electrical connection between the first interface and the second interface according to the control signal;
s30: according to the control signal, selecting a starting resistance test module or an insulation voltage withstand test module, and performing test work;
s40: and sending a test result.
Preferably, the method further comprises: s31: if the control signal contains multiple test operations, the process is circulated S20-S30 until the test operations are completed.
The implementation of the invention has the following beneficial effects: the device in the middle-low voltage distribution board is respectively connected with the insulation voltage-resistant testing module and the resistance testing module through the interface module, and the insulation voltage-resistant degree and/or the resistance of the device is controlled and input and tested by the control device; the automatic testing device is used for modularly designing a circuit, can automatically complete the operation of an electric switch and each checking testing step in a testing program, reduces the wire disassembling difficulty and testing risk compared with the traditional technology, and improves the overhaul efficiency.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic block diagram of an automatic test equipment for testing the performance of medium and low voltage distribution boards of the present invention;
FIG. 2 is a schematic circuit diagram of a current output module of an automatic test equipment for testing the performance of medium and low voltage distribution boards according to the present invention;
FIG. 3 is a schematic circuit diagram of a resistance test module of an automatic test device for testing the performance of a medium and low voltage distribution board according to the present invention;
FIG. 4 is a logic block diagram of an insulation and voltage withstand test module of an automatic test device for testing the performance of a medium and low voltage distribution board according to the present invention;
FIG. 5 is a schematic circuit diagram of a switching unit of an automatic test equipment for testing the performance of medium and low voltage distribution boards according to the present invention;
fig. 6 is a program flow chart of a test method for testing the performance of a medium and low voltage switchboard according to the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present invention and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In the prior art, the medium-low voltage distribution board includes a low voltage distribution board with a voltage level of 380v or less and a medium voltage distribution board with a voltage level of 35kv or less. The automatic testing device for testing the performance of the medium-low voltage distribution board is used for carrying out resistance testing or insulation voltage withstand testing on devices such as an electric switch and a secondary side component on the medium-low voltage distribution board.
As shown in fig. 1, an automatic test apparatus for testing performance of a medium and low voltage distribution board according to the present invention may include a resistance test module 300, an insulation and voltage test module 400, an interface module 200, and a control apparatus 100. Specifically, the resistance test module 300 may be used to test the resistance of the first device in the medium-low voltage switchboard, so as to prevent accidents caused by resistance drift; the insulation and voltage withstand test module 400 may be used to test insulation and/or voltage withstand of the second device in the medium-low voltage distribution board; the interface module 200 can be used as a connecting bridge to communicate a first device in the middle-low voltage distribution board with the resistance test module 300 and a second device in the middle-low voltage distribution board with the insulation voltage test module 400 so as to perform test work; the control device 100 may be configured to send a control instruction to the interface module 200, the resistance test module 300, and the insulation voltage test module 400 to control the operation thereof, or may receive test data of the performance test module and on-off control information of the interface module 200, and perform operation processing. It can be understood that the first device refers to a component which needs to be subjected to resistance test, and is not a specific component, and a plurality of first devices are arranged in the medium-low voltage distribution board; the second device refers to a component which needs to be subjected to insulation voltage withstand test, and is not a specific component, and a plurality of second devices are arranged in the middle-low voltage distribution board; meanwhile, the first device and the second device can represent the same electrical element, and only the distinction is made during the test of the resistance value and the insulation voltage resistance test so as to better explain the technical scheme.
Further, the interface module 200 includes a switching unit 203, and a first interface 201 and a second interface 202 matched with the switching unit 203; specifically, the switching unit 203 is configured to perform on-off control on the electrical connection between the first interface 201 and the second interface 202; the first interface 201 and the second interface 202 can be respectively arranged at two opposite sides of the switching unit 203, a plurality of first ports are arranged at the first interface 201, and the input interfaces of the first device and the second device in the medium-low voltage distribution board can be respectively connected through cables; the second interface 202 is also provided with a plurality of second ports, which are respectively connected to the insulation voltage withstand test module 400 and the resistance test module 300 through cables; the switching unit 203 may include a relay matrix 2031, where the relay matrix 2031 is electrically connected between the first interface 201 and the second interface 202, and its ports are respectively connected to the first interface 201 and the second interface 202; the relay matrix 2031 may change an electric shock circuit therein according to an instruction of the control apparatus 100 to connect the resistance test module 300 and any first device, and test a resistance of the corresponding first device; or the insulation voltage resistance test module 400 is communicated with any second device to test whether the insulation voltage resistance of the corresponding second device is qualified.
Further, as shown in fig. 3, the resistance testing module 300 includes a current output module 310 and a voltage acquisition module 320, which can adjust and output a stable current. Specifically, the current output module 310 is connected to the first device; the voltage acquisition module 320 is respectively connected with two ends of the first device; the current output module 310 may adjust and stably output the current passing through the first device, and the voltage acquisition module 320 acquires the voltage values of both ends of the first device when the current passes through the first device to measure the resistance value of the first device.
The principle of the resistance test module 300 is: the direct current source, which stably outputs the 0 to 200A current from the current output module 310, tests the resistance value of the first device through the ohm's law four-wire method through the first branch connected to the first device. The first device may include a contact resistor, a loop resistor, or a coil winding disposed within the medium-low voltage distribution board; the resistance of the first device is calculated by ohmic law by stably outputting a current through the first device and measuring a voltage value across the first device at a known current. The current output module 310 is internally provided with a sampling resistor RS, and the current value passing through the corresponding first device can be fed back to the current output module 310 and regulated through the connection of the sampling resistor RS and the first device so as to protect the first device and reduce calculation errors. It is to be understood that the sampling resistor RS may also be a component that can generate a current feedback signal, such as a current sensor, a hall element, a shunt, etc., and is not particularly limited in the present invention, as long as the above-mentioned functions are achieved.
Further, as shown in fig. 2, the current output module 310 includes a power unit 311 for outputting a voltage source, a sampling resistor RS for feedback, a first differential comparison circuit unit 314, a second differential comparison circuit unit 315, an isolation unit 312, and a pulse width modulator 313;
the positive and negative ends of the power unit 311 are respectively and electrically connected with the input end of the first differential comparison circuit unit 314, the output port of the first differential comparison circuit unit 314 is connected with the input end of the pulse width modulator 313 through the isolation unit 312, and the output end of the pulse width modulator 313 is connected with the power unit 311; the positive electrode end of the power unit 311 is connected with the first end of the first device, and the second end of the first device is connected with the negative electrode end of the current output module 310 after being connected with the sampling resistor RS in series; two ends of the sampling resistor RS are respectively connected to an input end of the second differential comparison circuit unit 315, and an output end of the second differential comparison circuit unit 315 is connected to the first differential comparison circuit unit 314.
Further, the second differential comparing circuit unit 315 includes a third operational amplifier U3, a fourth operational amplifier U4, a first resistor R1 and a first diode D1; the first end of the sampling resistor RS is connected with the negative output end of the power unit 311 and the inverting input end of the third operational amplifier U3, the second end of the sampling resistor RS is connected with the non-inverting input end of the third operational amplifier U3, the output end of the third operational amplifier U3 is connected with the inverting input end of the fourth operational amplifier U4, the positive input end of the fourth operational amplifier U4 is connected with the reference voltage Vr2, the output end of the fourth operational amplifier U4 is connected with the cathode of the first diode D1, and the anode of the first diode D1 is connected to the first differential comparison circuit unit 314 through the first resistor R1;
the first differential comparison circuit unit 314 comprises a first operational amplifier U1, a second operational amplifier U2 and a second resistor R2, wherein the negative output end of the power unit 311 is connected with the inverting input end of the first operational amplifier U1, the positive output end of the power unit 311 is connected with the non-inverting input end of the first operational amplifier U1, the output end of the first operational amplifier U1 is connected with the inverting input end of the second operational amplifier U2, and the non-inverting input end of the second operational amplifier U2 is respectively connected with the first ends of the first resistor R1 and the second resistor R2; the second end of the resistor R2 is grounded; the output terminal of the second operational amplifier U2 is connected to the pulse width modulator 313 through the isolation unit 312.
The working principle of the internal structure of the whole resistance test module 300 is as follows: the output voltage signal of the power unit 311 enters the first operational amplifier U1 to be amplified and then outputs a first voltage Vf1, the first voltage Vf1 and the feedback voltage Vr1 are compared through the second operational amplifier U2 and then output a control voltage Vc1, the control voltage Vc1 is input to the pulse width modulator 313 through the isolation unit 312, so that the pulse width modulator 313 outputs a pulse control signal, the duty ratio is changed, the power unit 311 is driven to regulate the output current, and finally the output current in a stable state is output; wherein the feedback voltage Vr1 is generated by the second differential comparing circuit: the current feedback signal generated by the sampling resistor RS enters a third operational amplifier U3 to be amplified and output a second voltage Vf2, the second voltage Vf2 is compared with a reference voltage Vr2 to output a comparison voltage Vc2, and the comparison voltage Vc2 passes through a first diode D1 and a first resistor R1 to output a feedback voltage Vr1; the first diode D1 and the first resistor R1 are used for adjusting the feedback voltage Vr1 finally output.
Alternatively, the reference voltage Vr2 may be set and controlled by the control apparatus 100, and the reference voltage Vr2 may be adjusted relatively when testing different first devices; when the voltage at two ends of the sampling resistor is smaller than the reference voltage Vr2, the current output by the power unit 311 is smaller, the duty ratio is correspondingly increased, and the current output by the power unit 311 is increased; conversely, the duty cycle is reduced, and the output current of the power unit 311 is reduced.
The voltage acquisition module 320 may refer to the prior art, so long as the voltage values at the two ends of the first device can be acquired when the current passes through the first device, and will not be described in detail herein.
As shown in fig. 4, the insulation voltage withstand test module 400 includes a second controller 401, a digital-to-analog converter 404, an amplifying circuit 402, and a boost rectifying circuit 403; the insulation voltage test module 400 outputs a high-voltage source of 0-2500V to test the insulation performance and/or voltage resistance of the second device in the middle-low voltage distribution board. In particular, the second device may comprise an insulation resistor and the amplifying circuit 402 may comprise a power amplifier; the first end of the second controller 401 is connected with the control device 100, the second end of the second controller is connected with the power amplifier through the digital-to-analog converter 404, and the third end of the second controller is connected with the boost rectifying circuit 403; the power amplifier is also connected to a boost rectifier circuit 403. The control device 100 transmits a signal to the second controller 401 to enable the second controller 401 to operate, so that the second controller 401 generates a digital signal and outputs a second control signal; the second control signal is used for commanding the digital-to-analog converter 404, the power amplifier and the boost rectifying circuit 403 to work; the digital signal is converted into an analog small signal through a digital-to-analog converter 404; the analog small signal is converted into a power signal after being processed by a power amplifier, and is transmitted to the boost rectifying circuit 403. The boost rectifying circuit 403 includes a boost unit 4031 and a rectifying unit 4032, where the boost unit 4031 boosts the power signal and then rectifies and filters the power signal through the rectifying unit 4032, and finally outputs a high-voltage signal for testing insulation and/or voltage-resistant performance of the second device.
Optionally, the second controller 401 may be an Xilinx ZYNQ 7000-series FPGA, and the generated digital signal is converted into an analog signal by the 18-bit high-precision DAC digital-to-analog converter 404; the rectifying unit 4032 may include a rectifying bridge.
As shown in fig. 5, the switching unit 203 may include a relay matrix 2031 and a third controller 2032, where the third controller 2032 is connected to the relay matrix 2031 and the control device 100, and the third controller 2032 receives a control instruction from the control device 100 and outputs a control signal to change the communication relationship of each relay in the relay matrix 2031 so as to implement an automatic test.
Specifically, in some embodiments of the present invention, relay matrix 2031 includes a matrix of relays K1-K6 and relays K1 '-K6'; specifically, the first relay K1 and the eleventh relay K1' are double-pole double-throw relays; the third relay K3, the fifth relay K5, the thirteenth relay K3', the fourteenth relay K4', the fifteenth relay K5', the sixteenth relay K6' adopt single-pole three-throw relays; the fourth relay K4 and the sixth relay K6 adopt single-pole four-throw relays; the second relay K2 and the twelfth relay K2' adopt double-pole three-throw relays. The movable contacts of the first relay K1 are respectively connected with high-voltage ports (UZ and UN), and the fixed contacts of the first relay K1 are respectively connected with the movable contacts of the third relay K3, the fourth relay K4, the fifth relay K5 and the sixth relay K6; the movable contact of the eleventh relay K1 'is respectively connected with the first current ports (IZ and IN), and the fixed contact of the eleventh relay K1' is respectively connected with the movable contact of the thirteenth relay K3', the fourteenth relay K4', the fifteenth relay K5', and the sixteenth relay K6'; the fixed contact of the third relay K3 is connected with the fixed contact of the thirteenth relay K3', and the fixed contact of the fifth relay K5 is connected with the fixed contact of the fifteenth relay K5'; the first fixed contact of the fourth relay K4 is grounded, and the other fixed contacts are respectively connected with the three-phase wire inlet end of the second device; the first fixed contact of the sixth relay K6 is grounded, and the other fixed contacts are respectively connected with the three-phase outlet terminal of the second device; the fixed contacts of the fourteenth relay K4 'are respectively connected with the three-phase wire inlet end of the second device, and the fixed contacts of the sixteenth relay K6' are respectively connected with the three-phase wire outlet end of the second device; the movable contacts of the second relay are respectively connected with second current ports (IS, ISN), and the fixed contacts of the second relay K2 are respectively connected with the three-phase inlet end and the three-phase outlet end of the first device; the movable contact of the twelfth relay K2' is respectively connected with the acquisition voltage ports (US and USN), and the fixed contact of the second relay is respectively connected with the three-phase inlet end and the three-phase outlet end of the first device.
More specific circuit connection relationships may be referred to in fig. 5, which is not repeated here. It will be appreciated that fig. 5 is a simplified circuit diagram, and the actual circuit diagram is provided with a plurality of ports for respectively connecting a plurality of first devices and second devices, and the principle and connection of the ports are consistent with the above.
In specific implementation, if the third controller 2032 controls the electric shock selection of the first relay K1, the fourth relay K4, and the sixth relay K6 during the insulation voltage withstand test, the insulation voltage withstand test module 400 is connected to the high-potential end of the primary/secondary insulation loop provided with the second device in the medium-low voltage distribution board through the first end UZ of the high-voltage port, and is connected to the second end UN of the high-voltage port through the low-potential end of the primary/secondary insulation loop provided with the second device in the medium-low voltage distribution board, so as to communicate the branch between the insulation voltage withstand test module 400 and the second device to be tested, and inputs high voltage to test the insulation and/or voltage withstand performance of the second device, thereby completing the whole insulation voltage withstand test process.
Further, in the case of performing the withstand voltage test, the resistance value of the second device may also be tested. The first current port (IZ, IN) can output three-phase current through the second device, and the resistance value of the second device can be calculated through ohm's law under the condition that the voltage value of the applied high voltage is known.
If the resistance test IS performed, the current output module 310 in the resistance test module 300 can generate high-precision direct current up to 200A, and the high-precision direct current IS output through the first end IS of the second current port, and after the high-precision direct current IS connected with the three-phase inlet end of the first device to be tested through the relay K2, the high-precision direct current returns to the second end ISN of the second current port of the current output module 310 from the three-phase outlet end of the first device; the voltage acquisition module 320 acquires voltages at two ends of the first device to be tested through acquisition voltage ports (US, USN); and then the resistance value of the first device is measured by ohm's law.
Further, the control device 100 of the automatic test device for testing the performance of the medium-low voltage distribution board in the invention comprises an upper computer, an upper computer electrical connection or communication connection resistance test module 300, an insulation voltage withstand test module 400 and an interface module 200; may be used to transmit a control signal to the resistance value test module 300, the withstand voltage test module 400, or the interface module 200. The upper computer is equivalent to a master controller, and can send control information of testing to the resistance test module 300 and/or the insulation voltage test module 400 to control and select to start corresponding testing functions, and the switching unit 203 of the corresponding control interface module 200 conducts corresponding testing channels to perform corresponding function tests on the medium-low voltage distribution board. Optionally, the selection of the test items and the on-off control of the switching unit 203 may utilize display modules such as an indicator light or a display screen to perform feedback, so that the staff can know the test progress conveniently.
Further, the upper computer can regulate the current value and the voltage value output by the resistance value testing module 300 and the insulation voltage testing module 400 so as to test each different first device and second device. Preferably, for the second device that fails the withstand voltage test, the withstand voltage test module 400 may also feed back failure information to the upper computer.
Furthermore, the upper computer can also be used for receiving the test data fed back from the resistance test module 300 and the insulation voltage test module 400 and the on-off control information fed back by the interface module 200, performing operation processing and testing one by one according to a preset flow, and the automation degree of the test process is high due to the control of the upper computer; in the testing process, the upper computer can acquire the current value and the voltage value passing through the first device and the second device, and calculate the current value and the voltage value based on the computing capability of the upper computer to obtain an accurate testing result.
In this embodiment, the upper computer may be a notebook computer, and in other alternative embodiments, the upper computer may also be a controller with logic control calculation and display functions, such as a PLC controller. The upper computer can also be in communication connection with the resistance test module 300, the insulation voltage test module 400 and the interface module 200 through the communication module; the communication module is a network interface module 200, which has a plurality of network interfaces, so that the upper computer, the resistance test module 300, the insulation voltage test module 400 and the interface module 200 can be connected to the communication module through the Ethernet cable, and the signal or data transmission between the upper computer and each module can be realized.
Based on the same inventive concept, as shown in fig. 6, the embodiment of the disclosure further provides a testing method for testing performance of a medium-low voltage distribution board, where the testing method adopts the automatic testing device for testing performance of a medium-low voltage distribution board, and the testing method includes:
s10: acquiring an external control signal;
s20: the interface module 200 enables the switching unit 203 to perform corresponding on-off control on the electrical connection between the first interface 201 and the second interface 202 according to the control signal;
s30: according to the control signal, selecting a starting resistance test module 300 or an insulation voltage withstand test module 400, and performing test work;
s40: and sending a test result.
In step S10 of this embodiment, the external control signal may be from the host computer, and the steps S10 to S40 may be controlled and automatically performed by deploying an automatic control test program in the host computer. After the upper computer confirms the test flow, a control signal is sent to the resistance test module 300, the insulation voltage test module 400 and the interface module 200, so that the test module and the interface module 200 execute corresponding actions according to the control signal. It can be understood that the test flow includes testing the plurality of first devices and the plurality of second devices sequentially according to a user setting, where the setting includes a test sequence, and voltage values and current values output to different first devices and second devices. For example, in the upper computer, if the selected testing procedure in the man-machine interface is to test the resistance value of the first device in the middle-low voltage distribution board, a control signal for testing the resistance value is sent to the resistance value testing module 300 and the interface module 200.
In step S20 of the present embodiment, the interface module 200 executes:
the third controller 2032 generates on-off control signals for the relay matrix 2031 according to control signals of the upper computer, so as to control the K2 and K2' in the relay matrix 2031 to be closed,
the path between the resistance test module 300 and the first device IS conducted, so that the current output module 310 outputs through the first end IS of the second current port, and after the current output module IS connected with the three-phase inlet end of the first device to be tested through the relay K2, the current output module returns to the second end ISN of the second current port of the current output module 310 from the three-phase outlet end of the first device; the voltage acquisition module 320 acquires voltages at two ends of the first device to be tested through acquisition voltage ports (US, USN).
In step S30 of the present embodiment, the resistance test module 300 executes:
starting the resistance test module 300, wherein the current output module 310 generates high-precision direct current of 0-200A according to the difference of the first devices, the high-precision direct current IS output through the first end IS of the second current port, and the high-precision direct current IS returned to the second end ISN of the second current port of the current output module 310 from the three-phase outlet end of the first device after being connected with the three-phase inlet end of the first device to be tested through the relay K2; the voltage acquisition module 320 acquires voltages at two ends of the first device to be tested through acquisition voltage ports (US, USN).
In step S40 of this embodiment, after the resistance testing module 300 completes execution:
the resistance test module 300 transmits test data to the upper computer; the test data comprises a passing current value and an acquired voltage value; the upper computer receives the test data of the resistance test module 300, and calculates the test result according to a preset calculation rule (such as ohm's law). The interface module 200 can also transmit the on-off control information to the upper computer, so that the upper computer can know the test progress.
In this embodiment, the test method further includes:
s31: if the control signal contains multiple test jobs, the process is repeated S20-S30 until the test is completed.
Still further to the above example, the control signal may include testing the plurality of first devices and the plurality of second devices, and after the resistance test module 300 and the interface module 200 perform the test for one time according to the control signal preset by the user, the next test is continued. The interface module 200 continues to generate on-off control signals for the relay matrix 2031, which can be communicated with the connection branch of the resistance test module 300 and the first device, or the connection branch of the insulation voltage withstand test module 400 and the second device; the resistance test module 300 or the withstand voltage test module 400 continues the test until the test is completed, and the test data is uploaded.
The uploading test data can be set according to a user, and the data can be transmitted after the single test is completed or the whole test flow is completed.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (7)
1. An automatic testing device for testing the performance of a medium-low voltage distribution board is characterized by comprising a resistance testing module (300) for testing the resistance of a first device in the medium-low voltage distribution board;
an insulation and voltage withstand test module (400) for testing insulation and/or voltage withstand degree of the second device in the medium-low voltage distribution board;
an interface module (200) comprising a switching unit (203), a first interface (201) and a second interface (202) which are matched with the switching unit (203); the first interface (201) is provided with a plurality of ports which are respectively used for connecting input interfaces of the first device and the second device, the second interface (202) is respectively connected with the insulation voltage resistance test module (400) and the resistance test module (300), and the switching unit (203) is used for controlling on-off of electrical connection between the first interface (201) and the second interface (202);
the control device (100) is respectively connected with the interface module (200), the insulation voltage resistance test module (400) and the resistance test module (300) so as to control the work of the interface module, the insulation voltage resistance test module and the resistance test module and perform data transmission;
the resistance value testing module (300) comprises a current output module (310) and a voltage acquisition module (320), wherein the current output module (310) can adjust and output stable current;
the current output module (310) is connected with the first device to output a stable current thereto; the voltage acquisition module (320) is respectively connected with two ends of the first device;
the current output module (310) comprises a power unit (311) for outputting a voltage source, a sampling Resistor (RS) for playing a feedback role, a first differential comparison circuit unit (314), a second differential comparison circuit unit (315), an isolation unit (312) and a pulse width modulator (313);
the positive end and the negative end of the power unit (311) are respectively and electrically connected with the input end of the first differential comparison circuit unit (314), the output port of the first differential comparison circuit unit (314) is connected with the input end of the pulse width modulator (313) through the isolation unit (312), and the output end of the pulse width modulator (313) is connected with the power unit (311);
one end of the positive electrode of the power unit (311) is connected with the first end of the first device, and the second end of the first device is connected with one end of the negative electrode of the current output module (310) after being connected with the sampling resistor RS in series; two ends of the sampling resistor RS are respectively connected with the input end of the second differential comparison circuit unit (315), and the output end of the second differential comparison circuit unit (315) is connected with the first differential comparison circuit unit (314);
the second differential comparison circuit unit (315) comprises a third operational amplifier U3, a fourth operational amplifier U4, a first resistor R1 and a first diode D1; the sampling resistor RS is connected with the negative output end of the power unit (311), the first end of the sampling resistor RS is connected with the inverting input end of the third operational amplifier U3, the second end of the sampling resistor RS is connected with the non-inverting input end of the third operational amplifier U3, the output end of the third operational amplifier U3 is connected with the inverting input end of the fourth operational amplifier U4, the positive input end of the fourth operational amplifier U4 is connected with the reference voltage Vr2, the reference voltage Vr2 is set and controlled by the control device (100), the output end of the fourth operational amplifier U4 is connected with the cathode of the first diode D1, and the anode of the first diode D1 is connected to the first differential comparison circuit unit (314) through the first resistor R1;
the first differential comparison circuit unit (314) comprises a first operational amplifier U1, a second operational amplifier U2 and a second resistor R2, wherein the negative output end of the power unit (311) is connected with the inverting input end of the first operational amplifier U1, the positive output end of the power unit (311) is connected with the non-inverting input end of the first operational amplifier U1, the output end of the first operational amplifier U1 is connected with the inverting input end of the second operational amplifier U2, and the non-inverting input end of the second operational amplifier U2 is respectively connected with the first ends of the first resistor R1 and the second resistor R2; the second end of the resistor R2 is grounded; the output end of the second operational amplifier U2 is connected with the pulse width modulator (313) through the isolation unit (312).
2. The automatic test equipment for testing the performance of a medium-low voltage distribution board according to claim 1, wherein the insulation voltage withstand test module (400) comprises a second controller (401), a digital-to-analog converter (404), an amplifying circuit (402) and a boost rectifying circuit (403);
the first end of the second controller (401) is connected with the control device (100), the second end of the second controller is connected with the amplifying circuit (402) through the digital-to-analog converter (404), and the third end of the second controller is connected with the boosting rectifying circuit (403); the amplifying circuit (402) is also connected with the boosting rectifying circuit (403);
the control device (100) controls the second controller (401) to generate a digital signal, and the digital signal passes through the digital-to-analog converter (404), the amplifying circuit (402) and the boost rectifying circuit (403) and then outputs a high-voltage signal to the second device.
3. The automatic test equipment for testing the performance of medium and low voltage distribution boards according to claim 1, characterized in that the switching unit (203) comprises a relay matrix (2031); the relay matrix (2031) is electrically connected between the first interface (201) and the second interface (202).
4. The automatic test equipment for testing the performance of a medium and low voltage distribution board according to claim 1, wherein the control equipment (100) comprises a host computer, and the host computer is electrically or communicatively connected with the resistance test module (300), the insulation and voltage withstand test module (400) and the interface module (200) and is used for sending control signals to the host computer.
5. The automatic test equipment for testing the performance of a medium and low voltage distribution board according to claim 1, wherein the first device comprises a contact resistor, a loop resistor or a coil winding provided in the medium and low voltage distribution board.
6. A test method for testing the performance of a medium and low voltage distribution board, characterized in that an automatic test device for testing the performance of a medium and low voltage distribution board according to any one of the preceding claims 1-5 is used;
the test method for testing the performance of the medium-low voltage distribution board comprises the following steps:
s10: acquiring an external control signal;
s20: the interface module (200) enables the switching unit (203) to correspondingly control on-off of the electrical connection between the first interface (201) and the second interface (202) according to the control signal;
s30: according to the control signal, selecting a starting resistance test module (300) or an insulation voltage withstand test module (400) and performing test work;
s40: and sending a test result.
7. The method for testing the performance of a medium and low voltage switchboard according to claim 6, further comprising:
s31: if the control signal contains multiple test operations, the process is circulated S20-S30 until the test operations are completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110928951.5A CN113671324B (en) | 2021-08-13 | 2021-08-13 | Automatic testing device and method for testing performance of medium-low voltage distribution board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110928951.5A CN113671324B (en) | 2021-08-13 | 2021-08-13 | Automatic testing device and method for testing performance of medium-low voltage distribution board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113671324A CN113671324A (en) | 2021-11-19 |
| CN113671324B true CN113671324B (en) | 2023-11-24 |
Family
ID=78542776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110928951.5A Active CN113671324B (en) | 2021-08-13 | 2021-08-13 | Automatic testing device and method for testing performance of medium-low voltage distribution board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113671324B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285042A (en) * | 1997-12-23 | 2001-02-21 | 泰斯特瑞R&D管理股份有限公司 | Electrical parameter monitoring system |
| CN101471602A (en) * | 2007-12-29 | 2009-07-01 | 比亚迪股份有限公司 | Bidirectional DC power supply circuit |
| CN103107697A (en) * | 2013-01-22 | 2013-05-15 | 深圳市华星光电技术有限公司 | Current regulating device and regulating method thereof |
| CN104022697A (en) * | 2014-06-13 | 2014-09-03 | 四川亚美动力技术有限公司 | Constant current source driving module for stepping motor of engine |
| CN104159357A (en) * | 2014-06-20 | 2014-11-19 | 东南大学 | Method and system for controlling output current effective value and power factor of LED lighting circuit |
| CN205721468U (en) * | 2016-05-11 | 2016-11-23 | 国神光电科技（上海）有限公司 | A kind of constant-current source circuit |
| CN208226842U (en) * | 2017-12-21 | 2018-12-11 | 深圳市皓文电子有限公司 | Flow equalizing circuit and power module for large power supply module |
| CN208270707U (en) * | 2018-05-31 | 2018-12-21 | 西安交通大学城市学院 | Calculus of finite differences high voltage power distributing cabinet discharging detecting system |
| CN109460099A (en) * | 2018-12-21 | 2019-03-12 | 煤科集团沈阳研究院有限公司 | Electrical equipment surface temperature rise current tracking examination and adjustment device and the method for inspection |
| CN111487516A (en) * | 2020-04-24 | 2020-08-04 | 中国科学院微电子研究所 | Semiconductor device testing device, method and system |
| CN111736068A (en) * | 2020-06-24 | 2020-10-02 | 无锡中科电气设备有限公司 | Intelligent detection method and system for medium-voltage distribution board |
| CN112309594A (en) * | 2020-10-30 | 2021-02-02 | 无锡中科电气设备有限公司 | Modular intelligent testing device for low-voltage disk cabinet of nuclear power station |
| CN112505420A (en) * | 2020-11-13 | 2021-03-16 | 武汉瑞莱保科技有限公司 | Intelligent test analysis system for distribution board |
| CN213459079U (en) * | 2020-10-30 | 2021-06-15 | 无锡中科电气设备有限公司 | Modular intelligent testing device for low-voltage disk cabinet of nuclear power station |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201698013U (en) * | 2010-02-01 | 2011-01-05 | 鸿富锦精密工业（深圳）有限公司 | DC power supply testing device |
-
2021
- 2021-08-13 CN CN202110928951.5A patent/CN113671324B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285042A (en) * | 1997-12-23 | 2001-02-21 | 泰斯特瑞R&D管理股份有限公司 | Electrical parameter monitoring system |
| CN101471602A (en) * | 2007-12-29 | 2009-07-01 | 比亚迪股份有限公司 | Bidirectional DC power supply circuit |
| CN103107697A (en) * | 2013-01-22 | 2013-05-15 | 深圳市华星光电技术有限公司 | Current regulating device and regulating method thereof |
| CN104022697A (en) * | 2014-06-13 | 2014-09-03 | 四川亚美动力技术有限公司 | Constant current source driving module for stepping motor of engine |
| CN104159357A (en) * | 2014-06-20 | 2014-11-19 | 东南大学 | Method and system for controlling output current effective value and power factor of LED lighting circuit |
| CN205721468U (en) * | 2016-05-11 | 2016-11-23 | 国神光电科技（上海）有限公司 | A kind of constant-current source circuit |
| CN208226842U (en) * | 2017-12-21 | 2018-12-11 | 深圳市皓文电子有限公司 | Flow equalizing circuit and power module for large power supply module |
| CN208270707U (en) * | 2018-05-31 | 2018-12-21 | 西安交通大学城市学院 | Calculus of finite differences high voltage power distributing cabinet discharging detecting system |
| CN109460099A (en) * | 2018-12-21 | 2019-03-12 | 煤科集团沈阳研究院有限公司 | Electrical equipment surface temperature rise current tracking examination and adjustment device and the method for inspection |
| CN111487516A (en) * | 2020-04-24 | 2020-08-04 | 中国科学院微电子研究所 | Semiconductor device testing device, method and system |
| CN111736068A (en) * | 2020-06-24 | 2020-10-02 | 无锡中科电气设备有限公司 | Intelligent detection method and system for medium-voltage distribution board |
| CN112309594A (en) * | 2020-10-30 | 2021-02-02 | 无锡中科电气设备有限公司 | Modular intelligent testing device for low-voltage disk cabinet of nuclear power station |
| CN213459079U (en) * | 2020-10-30 | 2021-06-15 | 无锡中科电气设备有限公司 | Modular intelligent testing device for low-voltage disk cabinet of nuclear power station |
| CN112505420A (en) * | 2020-11-13 | 2021-03-16 | 武汉瑞莱保科技有限公司 | Intelligent test analysis system for distribution board |
Non-Patent Citations (1)
| Title |
|---|
| 绝缘电阻与接地电阻测试系统的设计;赵岩等;《国外电子测量技术》;20070422(第04期);第71-73页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113671324A (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109142881B (en) | Intelligent switching line device for electric test of power transformer | |
| CN110161331B (en) | Detection platform for primary and secondary fusion complete equipment and control method | |
| CN101950011A (en) | Electricity transformer verification connection analog system and connection judging method thereof | |
| CN107544001B (en) | The insulating test set of spacecraft thermal test cable | |
| CN112083309B (en) | Intelligent test system and method for memory plate | |
| CN104020376A (en) | Three-remote automatic testing method for power distribution terminal | |
| CN112810837B (en) | Flight parameter recorder test system and test method | |
| CN113671324B (en) | Automatic testing device and method for testing performance of medium-low voltage distribution board | |
| KR101443245B1 (en) | Devices for low-voltage circuit breaker testing | |
| CN103995207A (en) | Three-remote automatic test device for power distribution terminal | |
| CN110901950A (en) | Automatic detection test platform for helicopter electrical system | |
| CN204008911U (en) | A kind of coil apparatus proving installation | |
| CN215768802U (en) | Multifunctional pipe jacking tunneling machine detection equipment and detection circuit thereof | |
| RU2436108C2 (en) | Complex of board cable networks monitoring | |
| CN110857953A (en) | Tester and method for measuring resistance of conductor connection point in power-on circuit | |
| CN113848462A (en) | Automatic test platform and test method for PCBA single board in power electronic industry | |
| RU102393U1 (en) | CONTROL COMPLEX | |
| CN204882817U (en) | General if converting circuit test system | |
| CN219609194U (en) | Multichannel wireless test calibrating device | |
| CN216646727U (en) | Automatic PCBA single board test platform for power electronic industry | |
| CN116873220B (en) | Multi-agent technology-based aircraft telex bench test system and method | |
| CN217227957U (en) | Analog load management system | |
| CN219302582U (en) | Radio equipment distribution box test device | |
| CN219085127U (en) | Portable multifunctional display device for measuring excitation characteristics of voltage transformer | |
| CN218099531U (en) | Automatic testing device for control power supply assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |