CN105785197A - Distribution automation device integrated tester - Google Patents

Abstract

The invention provides a comprehensive tester for power distribution automation devices, which includes a chassis and a circuit device; the circuit device includes an industrial computer for testing the main control and providing an operation interface; a liquid crystal touch screen for realizing human-machine information interaction; and the industrial computer and the computer. I/O unit information interaction, signal processing unit for processing switch signals and generating and outputting voltage and current signals according to set parameters; I/O unit for input/output of switch signals; for adjustable output A voltage amplifier for AC voltage, a current amplifier for outputting an adjustable AC current, and a power supply unit for supplying power. The invention is small in size, light in weight, easy to carry, low in cost, convenient in wiring during use, saves man-hours, and can perform high-precision detection on the tested power distribution automation device.

Description

Distribution automation device comprehensive tester

technical field

The invention relates to the field of distribution automation, in particular to a comprehensive tester for distribution automation devices.

Background technique

With the development of society and the advancement of technology, the use of automation devices in distribution networks is becoming more and more common. Distribution automation devices generally have the functions of remote signaling, telemetry, remote control and relay protection. During the new installation or renovation process of power distribution automation devices, its performance and status need to be tested, especially DTU (DataTransferunit, which is specially used to convert serial data into IP data or convert IP data into serial data through wireless communication. The wireless terminal equipment that transmits through the network) performs sampling, protection setting value verification, time measurement, signal loop inspection, linkage test and exchange with dispatching channel, etc. At present, at least three types of testing equipment are used to test the distribution automation device, such as a protection calibrator, a DC power supply, and an analog circuit breaker. Measure and test the relay protection function of the device under test; the analog circuit breaker is used to test the remote control circuit and switching value circuit of the device under test; the DC power supply is used to provide working power for the device under test. Its shortcomings are as follows: first, the commonly used protection calibrator is mainly composed of a voltage regulator and a phase shifter, which is large in size and weight, and the test accuracy is not high; second, it needs to carry three sets of Test equipment, and the three sets of equipment are large in size and weight, which is very inconvenient to carry during work; third, there are a large number of on-site test points, and the use of three sets of equipment for testing requires repeated disassembly and wiring, which seriously affects work efficiency and prolongs Power outage time; Fourth, the cost of using three sets of equipment is relatively high.

Contents of the invention

The purpose of the present invention is: to solve the problems in the prior art, to provide a distribution automation device with small volume, light weight, easy portability, low cost, convenient wiring during use, and high-precision detection of the tested device Tester.

The technical scheme of the present invention is: the power distribution automation device comprehensive tester of the present invention, comprises casing and circuit device; /O unit, voltage amplifier, current amplifier and power supply unit; where:

Industrial computer, used to test the main control and provide the operation interface;

LCD touch screen is used to realize human-computer information interaction, and the LCD touch screen is electrically connected to the industrial computer with two-way signals;

The signal processing unit interacts with the industrial computer and the I/O unit information, and is used to process the switch signal, generate and output voltage and current signals according to the set parameters; the signal processing unit is electrically connected to the industrial computer for two-way signals;

The I/O unit is used for the input/output of the switching signal; the I/O unit is electrically connected with the signal processing unit for bidirectional signals;

The voltage amplifier is used to amplify the power of the voltage signal sent by the signal processing unit, and output 3 adjustable AC voltages from 0 to 120V; the input terminal of the voltage amplifier is electrically connected to the signal processing unit;

The current amplifier is used to amplify the power of the current signal sent by the signal processing unit, and output 3 adjustable alternating currents of 0-30A; the input end of the current amplifier is electrically connected to the signal processing unit;

The power supply unit includes an AC/DC module, a transformer and a rectification and filtering module; among them, the AC/DC module is used to convert AC220V mains power into DC110V power output; the transformer is used to convert AC220V mains power into 3-way AC power output; Rectification and filtering module, which is used to rectify and filter the 3-way AC power output from the transformer, and then output 2-way AC power and 1-way DC power; 1 way of AC power supply is used for the voltage amplifier, and the other 1 way of AC power supply is used for The current amplifier provides working power; 1 DC power supply is used to provide working power for the signal processing unit, I/O unit, industrial computer and LCD touch screen.

A further scheme is: the above-mentioned signal processing unit includes an MCU module, a DSP module, a D/A module and an operational amplifier connected in series in sequence; wherein:

The MCU module is used for signal and operation command processing; the signal processing unit is electrically connected to the industrial computer and the I/O unit for bidirectional signals by its MCU module;

The DSP module is used to process the phase and amplitude of the voltage/current signal transmitted by the MCU module;

The D/A module is used to convert the digital signal sent by the DSP module into an analog signal;

The operational amplifier is used to amplify the analog signal sent by the D/A module, and output 3 voltage signals and 3 current signals.

A further solution is: the D/A module of the above-mentioned signal processing unit is a 16-bit D/A conversion module.

A further solution is: the above-mentioned circuit device also includes a power switch, an AC voltage output terminal set, a current output terminal set, a DC voltage output terminal set, a binary input terminal set, and a binary output terminal set arranged on the chassis panel. terminal set;

The AC voltage output terminal group is electrically connected to the output terminal of the voltage amplifier; the current output terminal group is electrically connected to the output terminal of the current amplifier; the DC voltage output terminal group is electrically connected to the output terminal of the AC/DC module of the power supply unit; Both the input terminal group and the binary output terminal group are electrically connected to the I/O unit signal; the power switch is used to control the on-off of the external AC220V mains power supply of the tester.

A further solution is: one of the three outputs of the voltage amplifier can be switched to output an adjustable direct current voltage of 0-250V; one of the three outputs of the current amplifier can be switched to output an adjustable direct current of 0-15A.

A further solution is: the above-mentioned circuit device also includes a communication interface for external communication equipment and a USB interface for external USB equipment arranged on the chassis panel; the communication interface and the USB interface are electrically connected to the industrial computer with bidirectional signals.

The present invention has positive effects: (1) The distribution automation device comprehensive tester of the present invention not only has all the functions of the protection calibrator, DC power supply and analog circuit breaker for on-site verification of distribution network automation devices in the prior art , and the present invention is a single device, small in size, light in weight, and easy to carry. (2) The comprehensive tester for power distribution automation device of the present invention, when in use, because it is a single device, it is very convenient to disassemble the input and output wiring. Compared with the three sets of equipment in the prior art, it can greatly save The waste of time caused by wiring can effectively improve work efficiency and shorten the detection time of power outages. (3) The comprehensive tester for power distribution automation device of the present invention, when it is in use, according to the difference between the power distribution automation device and the project to be tested, the staff only need to conveniently set the parameters through the LCD touch screen, and the tester will automatically Output the required voltage and current signals to complete the test, and conveniently view the corresponding test results through the LCD touch screen. Compared with the existing technology, the test accuracy is higher and the labor intensity is greatly reduced.

Description of drawings

Fig. 1 is a schematic block diagram of the circuit structure of the present invention;

FIG. 2 is a structural schematic diagram of the chassis panel and related circuit devices disposed on the chassis panel of the present invention.

The reference signs in the above-mentioned accompanying drawings are as follows:

Chassis panel 1, LCD touch screen 2, power switch 3, AC voltage output terminal group 4, current output terminal group 5, DC voltage output terminal group 6, binary input terminal group 7, binary output terminal group 8 , communication interface 9, USB interface 10.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

(Example 1)

Referring to Fig. 1 and Fig. 2, the comprehensive tester for power distribution automation device of this embodiment is mainly composed of a chassis and a circuit device. The case has a case body (not shown in the drawings) and a case panel 1 . The circuit device is mainly composed of a power supply unit, a signal processing unit, an I/O unit, a voltage amplifier, a current amplifier and an industrial computer arranged in the chassis, and a liquid crystal touch screen 2, a power switch 3, and an AC voltage output terminal set on the chassis panel 1 Group 4, current output terminal group 5, DC voltage output terminal group 6, binary input terminal group 7, binary output terminal group 8, communication interface 9 and USB interface 10.

The power supply unit is mainly composed of AC/DC modules, transformers and rectification and filtering modules. The AC/DC module is used to convert the externally connected AC220V mains power into DC110V power supply to provide working power for the distribution automation device under test during use; the transformer is used to convert the externally connected AC220V mains power into 3-way AC power supply during use The output is to the rectification and filtering module, and the transformer is preferably a linear transformer; the rectification and filtering module rectifies and filters the 3-way AC power provided by the transformer, and then outputs 2-way AC power and 1-way DC power: one of the AC power supplies is for the voltage amplifier, Another 1-way AC power supply is used for the current amplifier; 1-way DC power supply is used to provide working power for the signal processing unit, I/O unit, industrial computer and LCD touch screen 2; the input terminals of the AC/DC module and the transformer are connected in series through a power switch 3 Externally connected to AC220V mains; the output end of the AC/DC module is electrically connected to the DC voltage output terminal group 6; the input end of the rectification filter module is connected in series with the output end of the transformer; one output end of the rectification filter module is connected to the voltage amplifier The power supply is electrically connected; the other output end of the rectification and filtering module is electrically connected to the power supply of the current amplifier.

The signal processing unit is used for the interaction with the industrial computer, the processing of the switch signal, and the output of the voltage and current signals for testing; the signal processing unit is mainly composed of MCU modules, DSP modules, D/A modules and operational amplifiers connected in series; Among them, the MCU module is used for signal and operation command processing; the DSP module (DSP is the English abbreviation of digital signal processing) takes advantage of its fast speed and high precision, according to the set parameters transmitted by the MCU module, the output voltage/ Phase and amplitude processing are performed on the current signal to generate a corresponding voltage/current waveform signal; the signal processed by the DSP module is converted into an analog signal by the D/A module and then sent to the operational amplifier for signal amplification; the operational amplifier is equipped with 3 voltage channels Signal output terminal and 3 current signal output terminals; D/A module is a 16-bit DA conversion module.

The I/O unit is used for input/output connection conversion; the I/O unit is electrically connected with the MCU module of the signal processing unit for bidirectional signals; the I/O unit is connected to the binary input terminal group 7 and the binary output terminal group 8 signal electrical connection.

The voltage amplifier is used to amplify the power of the 3-way voltage signal sent by the operational amplifier of the signal processing unit, and output 3-way 0-120V adjustable AC voltage, one of which can be switched to output 0-250V adjustable DC voltage; for test use ; The input end of the voltage amplifier is electrically connected to the operational amplifier of the signal processing unit; the output end of the voltage amplifier is electrically connected to the AC voltage output terminal group 4; the voltage amplifier obtains the working power from the power module.

The current amplifier is used to amplify the power of the 3-way current signal sent by the operational amplifier of the signal processing unit, and output 3-way 0-30A adjustable AC current, one of which can be switched to output DC0-15A adjustable DC current; for use It is used for DC relay or corresponding DC current test; the input terminal of the current amplifier is electrically connected with the operational amplifier of the signal processing unit; the output terminal of the current amplifier is electrically connected with the current output terminal group 5; the current amplifier obtains the working power from the power module .

The industrial computer is used to realize the test master control and provide the operation interface; the industrial computer has a built-in comprehensive test program for the power distribution automation device, and displays the operation interface through the LCD touch screen 2; the industrial computer communicates with the MCU module of the signal processing unit, the LCD touch screen 2, and The interface 9 and the USB interface 10 are electrically connected with bidirectional signals.

The liquid crystal touch screen 2 is used to realize human-computer information interaction through the operation interface, such as setting of test parameters and working process, display of test related parameters, selection of test items, start and stop of test, etc.

The power switch 3 is used to control the on-off of the external power supply of the tester.

The AC voltage output terminal group 4 includes 4 terminal terminals UA, UB, UC and UN; when in use, the tester connects the 4 terminal terminals of the AC voltage output terminal group 4 with the power distribution automation device under test with cables. Connect, output 3 channels of 0-120V adjustable AC voltage or switch output 1 channel of 0-120V adjustable DC voltage.

The current output terminal group 5 includes 4 terminal terminals of IA, IB, IC and IN; when in use, the tester is electrically connected to the power distribution automation device under test through the 4 terminal terminals of the current output terminal group 5 with cables. Output 3 channels of 0-30A adjustable AC current or switch output 1 channel of 0-15A adjustable DC current;

The DC voltage output terminal group 6 includes 2 terminals, positive and negative. When in use, the tester is electrically connected to the power distribution automation device under test through the DC voltage output terminal group 6, and outputs DC110V power.

Binary input terminal group 7 includes A, B, C, R, a, b, c, r8 groups of 16 terminals; binary output terminal group 8 includes 4 groups of 8 terminals. The instrument is electrically connected with the tested power distribution automation device through the binary input terminal group 7 and the binary output terminal group 8 to realize the input and output of the switch signal.

The communication interface 9 is used for externally connecting related communication devices during use, and the externally connected communication devices interact with the industrial computer through the communication interface 9; the USB interface 10 is used for externally connecting related USB devices during use. The USB device interacts with the industrial computer through the USB interface 10 .

The working principle of the distribution automation device comprehensive tester of the present embodiment is briefly described as follows:

When the power switch 3 on the chassis panel 1 is turned on, the tester starts, and the power supply unit outputs DC110V working power to the device under test; the industrial computer displays the main operation menu through the LCD touch screen 2, and when a certain test item is selected, the industrial computer turns on. The soft switch of the power supply of the voltage amplifier and the current amplifier, if the power amplifier button displayed on the LCD touch screen 2 is pressed at this time, the power amplifier of the voltage amplifier and/or the power amplifier of the current amplifier is put into operation, and the power amplifier can work normally; according to the test items and the set parameters of the industrial computer , calculate the voltage and current waveform data of various states, and send them to the signal processing unit, and send them to the DSP module through the MCU module of the signal processing unit for phase modulation and amplitude modulation processing to generate corresponding voltage and current waveform signals, which are then converted by the D/A module The analog signal is amplified by the operational amplifier, and the amplified voltage/current signal is amplified by the voltage/current amplifier through the voltage amplifier and/or current amplifier, and then the terminal group 4 and/or current are output from the AC voltage on the chassis panel 1 The output terminal group 5 is output to the device under test; at the same time, the switching signal interacting with the device under test passes through the binary input terminal group 7 and/or the binary output terminal group 8, the I/O unit, and the signal processing unit. After the MCU module interacts with the industrial computer, the industrial computer continuously queries the I/O module while sending the data until the test is completed.

(Application example)

The distribution automation device comprehensive tester of the foregoing embodiment is used for the test process of the high-voltage circuit breaker, which is one of the distribution automation devices, as follows:

1. Turn on the power of the tester, set the parameters through the LCD touch screen 2, set the AC voltage output to 57.5V, and the AC current output to 5A;

2. Connect the tester to the secondary voltage and current measurement circuit of the high-voltage circuit breaker through the voltage and current wires; check whether the relay protection device of the high-voltage circuit breaker shows that the measured voltage value is 57.5V and the current is 5A; if the display is normal, it means The measuring circuit of the relay protection device of the high voltage circuit breaker is normal;

3. Connect the voltage and current wires of the tester to the secondary voltage and current protection circuit of the high-voltage circuit breaker; set the overcurrent setting value of the relay protection device of the high-voltage circuit breaker to 5A, and check whether the high-voltage circuit breaker is from close to open; if so, explain The protection circuit of the high-voltage circuit breaker relay protection device is normal.

The distribution automation device comprehensive tester of the aforementioned embodiment, when it is used for medium and low voltage switchgear or DTU device testing, the tester is connected with the medium and low voltage switchgear through its binary input connection terminal group 7 and binary output connection terminal group 8. Or the corresponding handcart, switch close position, ground knife position, etc. on the DTU device side; turn on the power of the tester, and set the corresponding parameters through the LCD touch screen 2; after starting the test, the tester repeatedly detects the I/O port. When the position state changes, the tester responds in time through the LCD touch screen 2; if everything is normal, it means that the position circuit of the device under test is normal.

The above embodiments are descriptions of specific implementations of the present invention, rather than limitations of the present invention. Those skilled in the relevant technical fields can also make various transformations and changes without departing from the spirit and scope of the present invention. Corresponding equivalent technical solutions, therefore all equivalent technical solutions should fall into the patent protection scope of the present invention.

Claims (6)

1. A distribution automation device comprehensive tester, comprising a chassis and a circuit device; the cabinet comprises a chassis panel; it is characterized in that: the circuit device comprises an industrial computer, a liquid crystal touch screen, a signal processing unit, an I/O unit, and a voltage amplifier , current amplifier and power supply unit; where: Industrial computer, used to test the main control and provide the operation interface; LCD touch screen is used to realize human-computer information interaction, and the LCD touch screen is electrically connected to the industrial computer with two-way signals; The signal processing unit interacts with the industrial computer and the I/O unit information, and is used to process the switch signal, generate and output voltage and current signals according to the set parameters; the signal processing unit is electrically connected to the industrial computer for two-way signals; The I/O unit is used for the input/output of the switching signal; the I/O unit is electrically connected with the signal processing unit for bidirectional signals; The voltage amplifier is used to amplify the power of the voltage signal sent by the signal processing unit, and output 3 adjustable AC voltages from 0 to 120V; the input terminal of the voltage amplifier is electrically connected to the signal processing unit; The current amplifier is used to amplify the power of the current signal sent by the signal processing unit, and output 3 adjustable alternating currents of 0-30A; the input end of the current amplifier is electrically connected to the signal processing unit; The power supply unit includes an AC/DC module, a transformer and a rectification and filtering module; among them, the AC/DC module is used to convert AC220V mains power into DC110V power output; the transformer is used to convert AC220V mains power into 3-way AC power output; Rectification and filtering module, which is used to rectify and filter the 3-way AC power output from the transformer, and then output 2-way AC power and 1-way DC power; 1 way of AC power supply is used for the voltage amplifier, and the other 1 way of AC power supply is used for The current amplifier provides working power; 1 DC power supply is used to provide working power for the signal processing unit, I/O unit, industrial computer and LCD touch screen. 2. The distribution automation device comprehensive tester according to claim 1, characterized in that: the signal processing unit comprises an MCU module, a DSP module, a D/A module and an operational amplifier connected in series successively; wherein: The MCU module is used for signal and operation command processing; the signal processing unit is electrically connected to the industrial computer and the I/O unit for bidirectional signals by its MCU module; The DSP module is used to process the phase and amplitude of the voltage/current signal transmitted by the MCU module; The D/A module is used to convert the digital signal sent by the DSP module into an analog signal; The operational amplifier is used to amplify the analog signal sent by the D/A module, and output 3 voltage signals and 3 current signals. 3. The comprehensive tester for power distribution automation device according to claim 2, characterized in that: the D/A module of the signal processing unit is a 16-bit D/A conversion module. 4. The comprehensive tester for power distribution automation device according to claim 1, characterized in that: said circuit device also includes a power switch, an AC voltage output terminal group, a current output terminal group, DC voltage output terminal group, binary input terminal group and binary output terminal group; The AC voltage output terminal group is electrically connected to the output terminal of the voltage amplifier; the current output terminal group is electrically connected to the output terminal of the current amplifier; the DC voltage output terminal group is electrically connected to the output terminal of the AC/DC module of the power supply unit; Both the input terminal group and the binary output terminal group are electrically connected to the I/O unit signal; the power switch is used to control the on-off of the external AC220V mains power supply of the tester. 5. The comprehensive tester for power distribution automation device according to claim 1, characterized in that: one of the three outputs of the voltage amplifier can be switched to output 0-250V adjustable DC voltage; the three outputs of the current amplifier One of the outputs can be switched to output 0-15A adjustable DC current. 6. The comprehensive tester for power distribution automation device according to claim 1, characterized in that: said circuit device also includes a communication interface for external communication equipment and a USB interface for external USB equipment arranged on the chassis panel. interface; the communication interface and the USB interface are respectively electrically connected with the industrial computer for bidirectional signals.