Mobile off-line testing device for special / high-voltage direct-current converter station protection device

Abstract

The invention belongs to the technical field of electrical equipment testing devices, and particularly relates to a mobile off-line testing device for an extra / high-voltage direct-current converter station protection device, which comprises a testing platform car shell, a mobile controllable power supply assembly, a control unit and an inverter assembly are arranged at the lower part in the testing platform car shell, and a testing tool storage cabinet is arranged in the middle of the testing platform car shell. An operation panel is arranged on the upper portion of the testing device, a power strip and a terminal strip are arranged on the side face of the operation panel, the terminal strip comprises a direct-current power supply terminal and a signal terminal, and the terminal strip is connected with a protection device through an adaptive cable. The protection device off-line test platform solves the problems that an original debugging system needs to additionally add multiple power supplies and more power lines, and the site is disordered and complex, can ensure that test and verification are easily promoted, is an external power supply system, is light and convenient to move at any time, and can meet different debugging working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical equipment testing devices, and in particular relates to a mobile off-line testing device for a protection device of an ultra-high voltage direct current converter station. Background Art

[0002] At present, the application of relay protection has a history of more than 80 years, but for its experiments and tests, classic electrical measurement methods and conventional electrical instruments have been used for a long time. There are various integrated instruments and power supplies at home and abroad, but a single instrument and power supply cannot simultaneously meet the various voltage levels and power requirements in the debugging process, and cannot solve the problems in the existing debugging process.

[0003] The relay protection device of the converter station is an automatic device for quickly and accurately cutting off power system faults. Its safe and reliable operation is of great significance to the power system. Relay protection devices are generally configured in duplicate (except for circuit breaker protection). When one set of devices fails, it can be temporarily withdrawn for maintenance. After maintenance, protection verification and functional testing are generally required.

[0004] Sometimes, during the verification process, a large number of secondary cables of the operating PT and CT need to be disconnected and connected, which may result in the risk of misoperation of the protection. The site often does not have the conditions for protection verification in the operating screen cabinet. In addition, the test process may require the use of AC and DC power of different voltage levels. Although the power supply cabinet is equipped in the current machine room to test the protection device, it often takes a lot of time to prepare AC and DC power supplies and make test lines during offline testing. Therefore, offline testing of protection devices is urgent, time-consuming and long. The current monitoring device has the following problems: it is not convenient, it cannot be used offline without power supply, and a 220V or 380V power supply is required on site; the debugging efficiency is low, the functions are not complete, the output connector is simple, and a large number of test connection lines need to be made; it is unsafe, the internal protection function is not complete, resulting in power failure debugging interruption failure; there is no data display, no test data recording function, and the test report cannot be output. Summary of the invention

[0005] The purpose of the present invention is to provide a mobile offline test device for a high-voltage DC converter station protection device in view of the problems existing in the prior art. The test device can input the voltage and signal required by the system in an offline state, thereby solving the problem that the original debugging system needs to add multiple power supplies, add more power lines, and the site is cluttered and complicated, and can ensure that the test and verification can be easily carried out. At the same time, the offline test platform of the protection device is an external power supply system with a light shape and is easy to move at any time, which can meet different debugging conditions.

[0006] The technical solution of the present invention is:

[0007] A mobile offline test device for a high-voltage DC converter station protection device comprises a test platform vehicle shell, wherein a mobile controllable power supply component, a control unit and an inverter component are arranged at the lower part of the test platform vehicle shell, a test tool storage cabinet is arranged in the middle part, and an operation panel is arranged at the upper part. A socket strip and a terminal strip are arranged on the sides of the operation panel respectively, and the terminal strip comprises a DC power supply terminal and a signal terminal, and the protection device is connected via an adaptor cable.

[0008] Specifically, the mobile controllable power supply assembly includes a DC part and an AC part, the AC power supply is a 220V / 380V voltage output, and the DC part is an adjustable power supply system.

[0009] Specifically, the power supply assembly includes a battery module, which uses a 48V 100AH ​​lithium battery.

[0010] The adjustable power supply system adopts embedded installation, including a DC power panel used in combination with the test platform vehicle operation panel, connected to the inverter power transmission power supply, the DC power output power is 2kw, and the output voltage is DC 0-110V.

[0011] Specifically, the inverter assembly is connected to the battery module to invert the DC48V voltage of the battery into a three-phase AC380V voltage.

[0012] Specifically, the control unit is controlled by PLC.

[0013] The beneficial effects of the present invention are as follows: the mobile offline test device for the protection device of the high-voltage DC converter station can input the voltage and signal required by the system in an offline state, which solves the problem that the original debugging system needs to add multiple power supplies, add more power lines, and the site is messy and complicated, and can ensure that the test and verification can be easily carried out. At the same time, the offline test platform of the protection device is an external power supply system with a light shape and is easy to move at any time, which can meet different debugging conditions.

[0014] Adopt diversified interfaces: It can output the power required by the system, and is equipped with professional test cables. It uses rubber plugs and sockets for quick connection. It is simpler and more portable to operate, which improves the convenience of operation and improves the efficiency of operation. Lightweight device: The shell material of the mobile protection device offline test device can be made of high-strength 6063 aviation aluminum alloy, which greatly reduces the weight while meeting the strength requirements. The components use high-performance products to improve the electrical safety performance. Technology of the device: The mobile protection device offline test device adopts PLC control technology, which can display and record test data, generate debugging reports, replace manual records, and improve work efficiency. Device applicability: It solves the problem that the original debugging system needs to add multiple power supplies, add more power cords, and the site is messy and complicated. It can ensure that the test and verification can be carried out easily. At the same time, the offline test platform of the protection device is an external power supply system with a lightweight shape and can be moved at any time to meet different debugging conditions; Device portability: Portability is taken into consideration when designing the equipment, and a mobile wheel set design is added for easy mobility. At the same time, the mobile wheel set has a locking function, which can be locked and cannot be moved when in use, which increases safety; The temperature rise of batteries, inverters, overvoltage, overcurrent and other protection functions are considered during the design to prevent safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] 1. Operation panel, 2. Socket strip, 3. Tool storage cabinet, 4. Control unit, 5. Charging port, 6. Power supply assembly, 7. Terminal block, 8. Button, 9. Inverter assembly, 10. Moving wheel, 11. Plug. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] like Figure 1 The structure diagram of the mobile offline test device of the high-voltage DC converter station protection device of the present invention is shown, including a test platform vehicle shell, a mobile controllable power supply component 6, a control unit 4 and an inverter component 9 are arranged in the lower part of the test platform vehicle shell, a test tool storage cabinet 3 is arranged in the middle, and an operation panel 1 is arranged in the upper part. The control unit 4 adopts PLC control, and the sides of the operation panel 1 are respectively provided with a plug strip 2 and a terminal row 7. The terminal row 7 includes a DC power supply terminal and a signal terminal. The protection device is connected through an adaptive cable. The specific terminal adopts a current and voltage terminal installed inside the test platform vehicle, and can also be led to the top of the operation panel of the platform vehicle in the form of a rubber joint. The test cable can be customized as a multi-core cable, one end of which is a matching rubber plug 11, and the other end is an alligator clip, which is convenient for wiring. When the test cable is not in use, the cable placed on the platform vehicle is stored in the test tool storage cabinet 3.

[0019] The mobile controllable power supply assembly includes a DC part and an AC part, the AC power supply is a 220V / 380V voltage output, and the DC part is an adjustable power supply system. The DC part of the power supply assembly 6 includes a battery module, which uses a 48V 100AH ​​lithium battery, and a charging interface 5 is provided on the upper side of the shell. The adjustable power supply system adopts embedded installation, including a DC power supply panel used in combination with the test platform vehicle operation panel, connected to the inverter power transmission power supply, and the inverter assembly is connected to the battery module to invert the DC48V voltage of the battery into a 3-phase AC380V voltage. The inverter output line is 3 live and 1 zero, and 1 live and 1 zero are selected as AC220V voltage, with an output power of 4kW. It can provide stable AC 220V and 380V voltage outputs at the same time. The DC power supply is taken from the AC220V power supply output by the inverter, and the DC power supply output power is 2kw, and the output voltage is DC 0-110V.

[0020] The operation panel is located on the front of the test platform vehicle, and is mainly provided with a miniature circuit breaker, an instrument, a button 8, and a display light. The panel component identification is clear and intuitive, and the layout is scientific and beautiful.

[0021] Example 1

[0022] This embodiment uses the test device provided by the present invention to test the device in the production workshop and on site: 48V voltage can be inverted into 380V three-phase voltage, and the measured voltage values ​​are as follows:

[0023] AC phase voltage 385V, BC phase voltage 384V, AB phase voltage 385V,

[0024] The AN voltage is 223V, the BN voltage is 222V, and the CN voltage is 224V.

[0025] The adjustable value of DC power supply is between 3V and 150V. The DC power supply is relatively stable when it is tested at 24V, 48V, 72V or 110V.

[0026] After the relay tester is connected to the device, it can be powered on and run stably.

[0027] The data on the PLC and display screen are set to be stable. The protection value is set to 65 degrees in the battery and inverter temperature rise protection setting. The temperature probe is heated with a hot air gun. When the set value is reached, it can be automatically protected to disconnect the power supply of the device.

[0028] In order to test the output power of the device, a 2.5KW single-phase motor was connected to the 220V output port for testing. It was found that the motor can run for more than 1.5 hours.

[0029] After testing, the larger the battery capacity (storage capacity), the longer the battery can be used after testing the control and protection and connecting to the relay protection instrument. The specific values ​​are as follows:

[0030]

[0031] From the above experiments, it can be seen that the test device provided by the present invention solves the problem of offline testing of protection devices and can steadily advance the debugging work. At the same time, the experimental platform is designed with multiple outlets of different voltage levels to meet various debugging environments. The lightweight multi-interface design makes the operation simpler and more portable, improves the convenience of operation, and improves the efficiency of operation.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A mobile offline test device for protection devices of UHV DC converter stations, comprising a test platform vehicle housing, characterized in that: The lower part of the shell of the test platform vehicle is provided with a mobile controllable power supply component (6), a control unit (4) and an inverter component (9), the middle part is provided with a test tool storage cabinet (3), and the upper part is provided with an operation panel (1). The sides of the operation panel (1) are respectively provided with a socket strip (2) and a terminal block (7), and the terminal block (7) includes a DC power supply terminal and a signal terminal, and is connected to a protection device via an adapter cable.

2. According to claim 1, the mobile offline testing device for protection device of UHV DC converter station is characterized in that: The mobile controllable power supply assembly (6) comprises a DC part and an AC part, the AC power supply has a 220V / 380V voltage output, and the DC part is an adjustable power supply system.

3. The mobile offline testing device for UHV / HV DC converter station protection device according to claim 1 is characterized in that: The power supply component (6) comprises a battery module, and adopts a 48V 100AH ​​lithium battery.

4. The mobile offline testing device for UHV / HV DC converter station protection device according to claim 2 is characterized in that: The adjustable power supply system adopts embedded installation, including a DC power supply panel used in combination with the test platform vehicle operation panel, connected to the inverter power supply, the DC power supply output power is 2kw, and the output voltage is DC 0-110V.

5. According to claim 1, the mobile offline testing device for protection device of UHV DC converter station is characterized in that: The inverter assembly is connected to the battery module to invert the DC48V voltage of the battery into a three-phase AC380V voltage.

6. The mobile offline testing device for UHV / HV DC converter station protection device according to claim 1 is characterized in that: The control unit (4) is controlled by PLC.

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