Intelligent non-full-phase loop testing device

Abstract

The invention relates to an intelligent non-full-phase loop testing device, which comprises a waveform acquisition module, a multi-phase interphase switching path module, an internal and external driving voltage switching module, a control signal core unit, an internal driving voltage generation module, an HMI human-computer interaction module, an energy power supply module and a battery charging module, the battery charging module and the energy power supply module are connected to the control signal core unit, the internal driving voltage generation module and the internal and external driving voltage switching module are connected to the multi-phase interphase switching access module, and the control signal core unit is connected to the multi-phase interphase switching access module and the HMI man-machine interaction module. And the multi-phase interphase switching path module is connected to the waveform acquisition module. The operation is convenient and fast, the test working time can be effectively shortened, the test time can be greatly shortened, the test quality can be improved, and the non-full-phase action time can be accurately metered by controlling the opening and closing of the split-phase switch, recording the action time, generating a test report and supporting and exporting the test report to the mobile storage device.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer substation secondary equipment debugging, and in particular relates to an intelligent non-full-phase loop testing device. Background Art

[0002] Circuit breakers of 220kV and above lines are usually equipped with three-phase inconsistency circuits to ensure that the circuit breaker will promptly trip the three phases in the three-phase inconsistency state to avoid phase-loss operation. Non-full-phase protection is usually implemented by the circuit breaker body mechanism, and its setting time needs to be coordinated with the single-phase reclosing setting to avoid three trips before reclosing.

[0003] The principle of non-full-phase protection implemented by the circuit breaker mechanism is as follows Figure 1 As shown: the three-phase open position relay (TWJ) of the circuit breaker connected in parallel is connected in series with the three-phase closed position relay (HWJ). When the three-phase positions of the circuit breaker do not correspond (one closed and two open or two closed and one open), the non-full-phase circuit will be connected, starting the non-full-phase time relay T, and the three phases will be tripped after a 2s delay.

[0004] On-site testing of non-full-phase circuits is usually carried out by short-circuiting the opening / closing circuits in turn, which is inefficient and cannot accurately measure the non-full-phase action time. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an intelligent non-full-phase circuit testing device, which introduces the opening and closing nodes and operating power supply of the switch into the device, operates the circuit breaker opening and closing in sequence through program control, detects the node potential, and calculates the opening and closing action time through the program, which will greatly improve the work efficiency and the quality of non-full-phase circuit testing.

[0006] The present invention solves the technical problem by the following technical solutions:

[0007] An intelligent non-full-phase loop testing device, characterized in that it includes a waveform acquisition module, a multi-phase interphase switching path module, an internal and external driving voltage switching module, a control signal core unit, an internal driving voltage generation module, an HMI human-computer interaction module, an energy supply module and a battery charging module, wherein the battery charging module and the energy supply module are connected to the control signal core unit in sequence, the internal driving voltage generation module and the internal and external driving voltage switching module are connected to the multi-phase interphase switching path module in sequence, the control signal core unit is respectively connected to the multi-phase interphase switching path module and the HMI human-computer interaction module, and the multi-phase interphase switching path module is connected to the waveform acquisition module.

[0008] Moreover, the working principle of the power supply circuit of the multi-phase interphase switching path module is as follows: after the power supply passes through the F1 insurance to limit overcurrent, it enters D2 to prevent the power supply from being reversed, and then suppresses the common-mode interference signal in the power supply through the T1 common-mode inductor to reduce the power supply interference. The input power supply is further filtered by the filter circuit composed of C2 and C3 and then enters U1 to transform the input voltage. After filtering by the feedback filter circuit composed of L1, D4 and C8, it enters the voltage conversion U2. After filtering by C7 and C5, the voltage is transformed again by U2 to generate the working voltage required by the system. At the same time, it passes through the B0505 ​​isolation module to provide the isolated working voltage required for system communication.

[0009] Moreover, the working principle of the switch input interface of the multi-phase interphase switching path module is as follows: the externally connected digital signal passes through the RX0 current limiting protection and then passes through the RX1 optocoupler and a protective resistor, and then enters the optocoupler UX0 after filtering through CX0. After the optocoupler isolation protection, the isolated and safe signal is passed to the optocoupler post-stage, and the signal is output after current limiting through CX1 and RX2 to complete the signal isolation transmission.

[0010] Moreover, the working principle of the multi-phase interphase switching path module is: the program control signal is amplified and driven by the UY0, UY1, and UY2 driving chips to directly drive the relays of the corresponding paths, thereby completing the program-controlled switching action of the interphase paths, and the path relay status indication circuit composed of RY1 and DY1 completes the indication of the relay status.

[0011] Moreover, the program-controlled communication circuit principle of the control signal core unit is that the communication signals A and B enter the communication conversion chip U6 through the anti-interference protection circuit composed of R24, R26, R25, D9, D10, R23, and R22 to convert the communication signals and forward them to the U7 isolation communication chip. Through the isolation protection of the isolation communication chip, the converted data is sent to the main control chip after current limiting by R18 and R19 to transmit data information.

[0012] Moreover, the main control core circuit principle of the control signal core unit is: the main control chip adopts a high-performance ARMCortex-M3 32-bit RISC core, a high-speed embedded memory, an operating frequency of 72MHz, and a large number of enhanced I / Os and peripherals connected to 2 APB buses. The clock circuit composed of Y1, C22, and C23 provides a working clock for the entire system, and a filtering system is provided for the main chip through multiple capacitors. The main chip provides programmable logic control for the entire switching and acquisition system and communication functions with the data processing system.

[0013] The advantages and beneficial effects of the present invention are:

[0014] 1. The present invention simplifies the work process, shortens the working time, and simplifies the non-full-phase test that originally required the cooperation of two people to be completed with one key to improve work efficiency and quality, and will eventually be promoted and applied in future substation projects.

[0015] 2. The present invention can automatically complete the non-full-phase test of the three-phase circuit breaker in one test, has a rectifier power supply, can output a 0-220V DC adjustable voltage, and can use a temporary AC power supply for non-full-phase testing when the control circuit does not have a DC power supply.

[0016] 3. During use, the external wiring of the present invention only requires the connection of eight test wires, 101, 102, 107A, 107B, 107C, 137A, 137B, and 137C, and the wiring can be reduced according to actual conditions.

[0017] 4. The present invention can output DC power and has the function of opening and closing circuit breakers. It can be used in applications where DC power is provided and circuit breakers are opened and closed when there is a lack of DC power.

[0018] 5. The present invention can record the action time of the phase switch and generate an electronic report, which can be exported to a mobile storage device. If conditions permit, the size of the test device should not be too large, and the overall size is controlled at 300*200*150. It is designed with a carrying handle for easy carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of non-full-phase protection;

[0020] Figure 2 It is a structural schematic diagram of the present invention;

[0021] Figure 3 It is a schematic diagram of the principle of the present invention;

[0022] Figure 4 It is a hardware principle block diagram of the present invention;

[0023] Figure 5 The working principle diagram of the power circuit of the multi-phase interphase switching path module of the present invention;

[0024] Figure 6 It is a working principle diagram of the switch quantity input interface of the multi-phase interphase switching path module of the present invention;

[0025] Figure 7 This is a working principle diagram of the multi-phase interphase switching path module of the present invention;

[0026] Figure 8 The schematic diagram of the program control communication circuit of the control signal core unit of the present invention;

[0027] Fig. 9This is a schematic diagram of the main control core circuit of the control signal core unit of the present invention;

[0028] Fig.10 This is a control flow chart of the control signal core unit of the present invention;

[0029] Fig.11 It is a schematic diagram of the working interface of the present invention;

[0030] Fig.12 It is a schematic diagram of the working measurement interface of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0032] like Figure 2 The structure diagram of the present invention is shown. The front side mainly has eight wiring sockets, namely KM+, KM-, 107A, 107B, 107C, 137A, 137B, and 137C. The corresponding terminals of the circuit to be tested are connected through the experimental line. Human-computer interaction is realized through the touch screen interface. The single-phase split-and-close switch is realized by short-circuiting the split-and-close nodes inside the device, and the potential is monitored in real time to determine the position of the split-phase switch. The internal program determines whether the test is qualified according to the switch action logic and action time. If there is an abnormality, the on-site personnel are prompted to handle it. If the action is normal, the action record is saved and a test report is generated. The front side of the test device also has an AC power socket for the test device to provide power for the test device, and is equipped with a fuse to ensure power safety.

[0033] The overall system of the test device is as follows Figure 3 As shown, the non-full-phase action logic part is mainly realized by the single-chip microcomputer controller, which detects the node potential to determine the switch position, and controls the switch by closing the opening and closing nodes. It is equipped with six groups of relays that are independently controlled by the program to open and close, and act in sequence (three-phase open → A close → B close → C close → three-phase close → A open → three-phase close → B open → three-phase close → C open). At the same time, it is equipped with seven potential detection nodes to measure the output voltage (110V) and six groups of circuit breaker position nodes respectively. Detect the potential of the six groups of relay nodes and record the displacement time, generate an electronic report and support export through USB, and record the non-full-phase action time through the single-chip microcomputer potential displacement time detection and generate a report.

[0034] The device is equipped with an AC power supply and a rectifier module, which can convert 220V AC into ±110V DC, which is used to provide temporary power when the circuit breaker has no operating power. The action interval can be adjusted through the touch screen interface to match various types of circuit breakers and usage scenarios.

[0035] The specific operation of the present invention is:

[0036] 1. Connect the eight wiring sockets +KM, -KM, 107A, 107B, 107C, 137A, 137B, and 137C to the corresponding terminals of the circuit to be tested, i.e., the opening and closing circuit of the circuit breaker and the positive and negative DC common terminals, through the experimental wires. Connect the AC 220V working power supply, open the test interface, select the test mode as non-full-phase whole group test, set the test action time interval according to the energy storage time of the circuit breaker mechanism, press the start test button, and the device starts testing. During the test, observe whether the phase switch action logic is correct. After the test is completed, check whether the switch opening and closing action logic and action time during the action report action meet the requirements;

[0037] 2. When the device is used to open and close the circuit breaker, the tester can output DC power and has the function of opening and closing the circuit breaker. It can be used to provide DC and open and close the circuit breaker in the absence of DC. Connect the DC +KM, -KM terminals to the common end of the circuit breaker body mechanism operation circuit, connect the six opening and closing wiring sockets 107A, 107B, 107C, 137A, 137B, and 137C to the circuit breaker operation circuit to be opened and closed (the three-phase linkage switch can only connect one terminal each). When the circuit breaker is in the open position, press the corresponding phase circuit breaker to close. When the circuit breaker is in the closed position, press the corresponding phase circuit breaker to open. The circuit breaker can be operated flexibly.

[0038] 3. When the device needs to copy the report, insert the storage device from the USB port, select the corresponding report in the action record column, and click Export Data to import the report into the storage device.

[0039] like Figure 4 As shown, an intelligent non-full-phase loop testing device, the innovation of which lies in: comprising a waveform acquisition module, a multi-phase interphase switching path module, an internal and external driving voltage switching module, a control signal core unit, an internal driving voltage generation module, an HMI human-computer interaction module, an energy supply module and a battery charging module, the battery charging module and the energy supply module are connected to the control signal core unit in sequence, the internal driving voltage generation module and the internal and external driving voltage switching module are connected to the multi-phase interphase switching path module in sequence, the control signal core unit is respectively connected to the multi-phase interphase switching path module and the HMI human-computer interaction module, and the multi-phase interphase switching path module is connected to the waveform acquisition module.

[0040] The working principle of the power circuit of the multi-phase interphase switching path module is as follows Figure 5As shown: the power supply passes through the F1 insurance to limit overcurrent and then enters D2 to prevent the power supply from being reversed. The common-mode interference signal in the power supply is suppressed by the T1 common-mode inductor to reduce power supply interference. The input power supply is further filtered by the filter circuit composed of C2 and C3 and then enters U1 to transform the input voltage. After being filtered by the feedback filter circuit composed of L1, D4 and C8, it enters the voltage converter U2. After being filtered by C7 and C5, the voltage is transformed again by U2 to generate the working voltage required by the system. At the same time, it passes through the B0505 ​​isolation module to provide the isolated working voltage required for system communication.

[0041] The working principle of the switch input interface of the multi-phase interphase switching path module is as follows Figure 6 As shown: the external digital signal passes through the RX0 current limiting protection, then passes through the RX1 optocoupler and connected to the protection resistor, is filtered through CX0, enters the optocoupler UX0, and is isolated and protected by the optocoupler. The isolated and safe signal is passed to the optocoupler post-stage, and the signal is output after current limiting through CX1 and RX2, completing the signal isolation transmission.

[0042] The working principle of the multi-phase switching path module is as follows Figure 7 As shown: the program control signal is amplified and driven by the UY0, UY1, and UY2 driver chips and directly drives the relays of the corresponding paths to complete the program-controlled switching action of the phase-to-phase paths. The path relay status indication circuit composed of RY1 and DY1 completes the indication of the relay status.

[0043] The principle of program control communication circuit of control signal core unit is as follows Figure 8 As shown, the communication signals A and B enter the communication conversion chip U6 through the anti-interference protection circuit composed of R24, R26, R25, D9, D10, R23, and R22 to convert the communication signals and forward them to the U7 isolation communication chip. Through the isolation protection of the isolation communication chip, the converted data is sent to the main control chip after current limiting by R18 and R19 for data information transmission.

[0044] The main control core circuit principle of the control signal core unit is as follows Fig. 9 As shown: the main control chip adopts a high-performance ARMCortex-M3 32-bit RISC core, high-speed embedded memory, an operating frequency of 72MHz, and a large number of enhanced I / Os and peripherals connected to 2 APB buses. The clock circuit composed of Y1, C22, and C23 provides the working clock for the entire system, and a filtering system is provided for the main chip through multiple capacitors. The main chip provides programmable logic control for the entire switching and acquisition system and communication functions with the data processing system.

[0045] like Fig.10 The control flow chart of the control signal core unit is shown as follows. Fig.11It is a schematic diagram of the working interface of the present invention, Fig.12 This is a working measurement interface diagram of the present invention.

[0046] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An intelligent non-full-phase loop test device, characterized in that: It includes a waveform acquisition module, a multi-phase interphase switching path module, an internal and external driving voltage switching module, a control signal core unit, an internal driving voltage generation module, an HMI human-computer interaction module, an energy supply module and a battery charging module. The battery charging module and the energy supply module are connected to the control signal core unit in sequence, the internal driving voltage generation module and the internal and external driving voltage switching module are connected to the multi-phase interphase switching path module in sequence, the control signal core unit is respectively connected to the multi-phase interphase switching path module and the HMI human-computer interaction module, and the multi-phase interphase switching path module is connected to the waveform acquisition module.

2. The intelligent non-full-phase loop test device according to claim 1, characterized in that: The working principle of the power supply circuit of the multi-phase interphase switching path module is as follows: after the power supply passes through the F1 insurance to limit overcurrent, it enters D2 to prevent the power supply from being reversed, and then suppresses the common-mode interference signal in the power supply through the T1 common-mode inductor to reduce the power supply interference. The input power supply is further filtered by the filter circuit composed of C2 and C3 and then enters U1 to transform the input voltage. After filtering by the feedback filter circuit composed of L1, D4 and C8, it enters the voltage conversion U2. After filtering by C7 and C5, the voltage is transformed again by U2 to generate the working voltage required by the system. At the same time, it passes through the B0505 ​​isolation module to provide the isolated working voltage required for system communication.

3. The intelligent non-full-phase loop testing device according to claim 1, characterized in that: The working principle of the switch input interface of the multi-phase interphase switching path module is as follows: the externally connected digital signal passes through the RX0 current limiting protection and then passes through the RX1 optocoupler in parallel with the protection resistor, and then enters the optocoupler UX0 after filtering through CX0. After the optocoupler isolation protection, the isolated and safe signal is passed to the optocoupler post-stage, and the signal is output after current limiting through CX1 and RX2 to complete the signal isolation transmission.

4. The intelligent non-full-phase loop test device according to claim 1, characterized in that: The working principle of the multi-phase interphase switching path module is: the program control signal is amplified and driven by the UY0, UY1, and UY2 driving chips to directly drive the relay of the corresponding path to complete the program-controlled switching action of the interphase path, and the path relay state indication circuit composed of RY1 and DY1 completes the indication of the relay state.

5. The intelligent non-full-phase loop testing device according to claim 1, characterized in that: The principle of the program-controlled communication circuit of the control signal core unit is that the communication signals A and B enter the communication conversion chip U6 through the anti-interference protection circuit composed of R24, R26, R25, D9, D10, R23, and R22 to convert the communication signals and forward them to the U7 isolation communication chip. Through the isolation protection of the isolation communication chip, the converted data is sent to the main control chip after current limiting by R18 and R19 to transmit data information.

6. The intelligent non-full-phase loop testing device according to claim 1, characterized in that: The main control core circuit principle of the control signal core unit is as follows: the main control chip adopts a high-performance ARM Cortex-M3 32-bit RISC core, a high-speed embedded memory, an operating frequency of 72MHz, and a large number of enhanced I / Os and peripherals connected to two APB buses. The clock circuit composed of Y1, C22, and C23 provides a working clock for the entire system, and a filtering system is provided for the main chip through multiple capacitors. The main chip provides programmable logic control for the entire switching and acquisition system and communication functions with the data processing system.

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