Transformer protection measurement and control device based on integration of main transformer and rear transformer

Abstract

The utility model relates to a transformer protection measurement and control device based on main and rear integration, which comprises a case, a liquid crystal board, a bus board, a main control board, an analog input board, an on-off output board and an on-off input board, and the liquid crystal board, the bus board, the main control board, the analog input board, the on-off output board and the on-off input board are respectively arranged in the case. The device further comprises a plurality of cover plates, and the cover plates are installed on the case and correspondingly connected with the main control board, the analog quantity input board, the switching value output board and the switching value input board respectively. According to the utility model, a split type installation design is adopted, each board card is respectively connected with one rear cover, the rear covers are installed on the box body, each board card is independently detachable and convenient to install, various hardware resource board cards can be freely combined according to actual requirements on site, the universality is strong, electrical interfaces and physical sizes of all board cards are kept in a unified standard, and the cost is low. And the flexibility and convenience of system configuration are further improved.

Description

Technical Field

[0001] The utility model relates to a transformer protection device, in particular to a transformer protection measurement and control device based on the integration of main and rear components. Background Art

[0002] In power systems, main transformers play a central role in the transmission, conversion, and distribution of electrical energy, making their importance undeniable. A failure in a main transformer can directly disrupt the normal operation of downstream equipment, threatening the safety and stability of the entire power system. Therefore, it is crucial to deploy efficient and reliable protection and measurement and control devices to monitor and protect transformers in real time.

[0003] Currently, most transformer protection devices on the market utilize a split-type configuration with differential protection and backup protection. While this configuration meets protection requirements to a certain extent, it has several drawbacks. First, the split-type configuration complicates wiring, increasing installation difficulty and limiting the flexible deployment of protection devices within the substation, resulting in a high space utilization rate. Second, the integrated rear cover design of the device makes disassembly for repairs or component replacements cumbersome and time-consuming, significantly impacting maintenance efficiency. Furthermore, the fixed-slot installation method requires that multiple panels must be aligned one-to-one, further complicating installation and maintenance.

[0004] More critically, existing protection devices suffer from significant deficiencies in sampling accuracy and the number of sampling points. This low sampling precision and limited number of sampling points limit the accuracy of electrical parameter calculations, making it impossible to accurately reflect the transformer's actual operating status. Furthermore, transformer protection devices require numerous wiring connections, including complex wiring requirements for varying voltage levels. Common wiring errors, such as misplacing current and voltage lines or reversing input and output lines, are common, and existing devices often lack effective configuration methods.

[0005] The utility model patent with publication number CN206977029U discloses a plug-in differential protection device for a multi-winding phase-shifting transformer with arbitrary phase shift angle. It is a plug-in installation structure, including a backplane and a power supply board, a switch board, a main control board, a sampling board, a recording board and a communication board that are plug-in installed with the backplane; a number of bus-type slots are provided on the backplane, and the power supply board, the switch board, the main control board, the sampling board, the recording board and the communication board are inserted into the backplane through the bus-type slots and connected to the backplane. The backplane provides power access, clock routing, and bus interconnection for all plug-in boards in the device, and cooperates with the external chassis of the device to provide mechanical support for all units in the device. This patent is suitable for differential protection of a multi-winding phase-shifting transformer with arbitrary phase shift angle, and uses differential protection as the main protection, but does not combine the main protection of the main transformer with the backup protection of the main transformer. At the same time, the back cover of the board can only be removed at the same time, affecting work efficiency.

[0006] Therefore, providing a transformer protection and measurement control device that combines the main protection and backup protection of a main transformer and has a rear cover that can be independently detached is currently needed to solve the problem. Utility model content

[0007] The utility model discloses a transformer protection and measurement control device based on main and backup integration to overcome the defects of the prior art.

[0008] The utility model discloses a transformer protection and measurement control device based on main and backup integration to overcome the defects of the prior art.

[0009] According to one aspect of the utility model, a kind of transformer protection and measurement control device based on main and backup integration, including case, liquid crystal board, bus board, main control board, analog input board, switching output board and switching input board, the liquid crystal board, bus board, main control board, analog input board, switching output board and switching input board are respectively installed in case, the device further include multiple cover plate, the cover plate is installed on case, and respectively with main control board, analog input board, switching output board and switching input board corresponding connection.

[0010] As preferred technical scheme, the bus board includes multiple sockets, the main control board, analog input board, switching output board and switching input board all include pin, the pin and socket are connected.

[0011] As preferred technical scheme, the socket is arranged side by side.

[0012] As preferred technical scheme, the main control board includes main control chip unit, storage unit, output unit and communication board, the storage unit is installed in main control chip unit.

[0013] As preferred technical scheme, the storage unit includes NorFlash subunit and SRAM subunit.

[0014] As preferred technical scheme, the communication board includes RS485 interface, Ethernet interface, GPS interface and USB interface.

[0015] As preferred technical scheme, the analog input board includes voltage transformer, current transformer and analog-digital converter, the voltage transformer and current transformer are connected with analog-digital converter respectively.

[0016] As preferred technical scheme, the switching output board includes passive relay output interface.

[0017] As preferred technical scheme, the switching input board includes switching acquisition loop and power module.

[0018] As a preferred technical scheme, the liquid crystal panel comprises a liquid crystal screen, a key and an indicator light, and the liquid crystal screen, the key and the indicator light are connected with the bus plate respectively.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The cover plate of the utility model adopts split type installation design, each plate card is connected with a rear cover respectively, the rear cover is installed on the box body, each plate card is independently detachable, which is convenient for installation, can freely combine various hardware resource plate cards according to actual needs on site, has strong universality, the electrical interface and physical size of all plate cards are kept uniform standard, so that seamless docking and position interchanging of them are ensured, and the flexibility and convenience of system configuration are further improved.

[0021] 2. The utility model adopts centralized design, combines the differential protection of the main transformer and the backup protection function of the main transformer, concentrates various functions on the same device, realizes current longitudinal differential protection, high-low voltage side three-section type overcurrent protection, zero flow protection, zero sequence overvoltage, PT disconnection and other protection functions; wherein, in the current type protection function, the differential current and protection current channel are optional, and the high-low side complex pressure locking function is added, and the protection condition judgment is more rigorous.

[0022] 3. The utility model discloses the design wiring mapping function, can flexibly configure the voltage current sampling channel, if the wiring problem of different channel sampling connection wrong position or incoming and outgoing line connection is reversed, the wiring mapping function can adjust it, effectively avoids the tedious steps of manual change wiring, thereby greatly improving the convenience and efficiency of operation.

[0023] 4. The utility model discloses real-time monitoring high-low voltage side differential current, protection current, voltage and other electric parameter signals, records internal element action behavior, action time and other information, can view operation log, system record, event record, including protection action sequence time, fault type and fault parameter;It has the fault recording wave function, records the sampling data of input analog quantity and other information before and after the fault, can directly view the fault waveform, and can export the recording wave data through the RS485 interface, the Ethernet interface and the USB interface.

[0024] 5. The utility model discloses the main control board adopts the processor of 550MHz main frequency, combines and adopts 16 bit high accuracy synchronous sampling A / D converter with analog-digital converter, realizes 48 points sampling of every cycle, and is supplemented with real-time parallel computing technology, ensures the high efficiency and precision of data processing;Meanwhile, it is equipped with 1MB flash memory, 564KB SRAM, additional 4MB NorFlash and 1MB static SRAM, and this rich hardware resource combination not only satisfies the demand of complex operation and data storage, but also significantly improves the overall reliability and stability of equipment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Structure block diagram of the utility model;

[0026] Figure 2 Terminal diagram of rear cover plate of the utility model;

[0027] Figure 3 Internal structure schematic view of the utility model;

[0028] Figure 4 Appearance structure view of the utility model.

[0029] 1. Liquid crystal version;2. Bus board;3. Main control board;4. Communication board;5. Analog quantity input board;6. Switching quantity output board;7. Switching quantity input board;10. Chassis;11. Liquid crystal screen;12. Key;13. Indicator lamp;31. Main control chip unit;32. NorFlash subunit;33. SRAM subunit;34. Output unit (34);41. RS485 interface;42. Ethernet interface;43. GPS interface;44. USB interface;51. Voltage transformer;52. Current transformer;61. Passive relay output interface;71. Switching quantity acquisition loop;72. Power module. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative work should belong to the protection scope of the utility model.

[0031] In the power system, the main transformer plays a core role in power transmission, conversion and distribution, and its importance is self-evident. Once the main transformer fails, it will directly interfere with the normal operation of the lower-level equipment, and further threaten the safety and stability of the entire power system. Therefore, it is particularly important to configure efficient and reliable protection and control devices to monitor and protect the transformer in real time.

[0032] At present, most of the transformer protection devices on the market adopt differential protection and backup protection in a split configuration. This configuration method meets the protection requirements to some extent, but has many shortcomings. First, the split configuration leads to complex wiring, which not only increases the installation difficulty, but also limits the flexible deployment of the protection device in the substation, and has a high space occupancy rate. Second, the integrated back cover design on the device makes the disassembly process tedious and time-consuming when repairing or replacing parts, which seriously affects the maintenance efficiency. In addition, the fixed slot installation method requires that multiple plates must be one-to-one corresponding, further increasing the complexity of installation and maintenance.

[0033] More importantly, the existing protection device has obvious shortcomings in sampling accuracy and sampling point number. Due to the low sampling accuracy and the small number of sampling points, the calculation accuracy of electrical parameters is limited, and the actual operating state of the transformer cannot be accurately reflected. At the same time, the actual wiring number of the transformer protection device is large, involving complex wiring requirements of different voltage levels, and common wiring errors such as current and voltage connection error or input and output line connection error are easy to occur. The existing device often lacks effective configuration means.

[0034] Therefore, the utility model provides a kind of transformer protection measurement and control device based on main rear integration.The utility model's cover plate adopts split mounting design, and each plate card is respectively connected with a rear cover, and the rear cover is installed on the box body, and each plate card is independently detachable, easy to install, and a variety of hardware resource plate cards can be freely combined according to actual needs on site, with strong versatility, the electrical interface and physical size of all plate cards are kept uniform standard, ensuring that they can be seamlessly connected, and the flexibility and convenience of system configuration are further improved.The utility model adopts centralized design, combines the differential protection of main transformer and backup protection function of main transformer, concentrates multiple functions on the same device, realizes current longitudinal differential protection, high-low voltage side three-section overcurrent protection, zero-flow protection, zero-sequence overvoltage, PT wire breakage and other protection functions;Among them, the design differential current and protection current channel is optional in current type protection function, and high-low side complex pressure locking function is added, and the protection condition judgment is more rigorous.The utility model designs wiring mapping function, can flexibly configure voltage and current sampling channel, if different channel sampling connection error position or incoming and outgoing line connection problem occurs, wiring mapping function can adjust it, effectively avoids the tedious steps of manual wiring change, thereby greatly improving the convenience and efficiency of operation.The utility model monitors high-low voltage side differential current, protection current, voltage and other electric parameter signals in real time, records internal element action behavior, action time and other information, can view operation log, system record, event record, including protection action sequence time, fault type and fault parameter;With fault recording function, record sampling data and other information before and after fault and input analog quantity, can directly view fault waveform, also can export recording data through RS485 interface, Ethernet interface and USB interface.The utility model's main control board adopts processor with main frequency of 550MHz, combined with 16-bit high-precision synchronous sampling A / D converter, realizes 48-point sampling per cycle, and is assisted by real-time parallel computing technology, ensures the efficiency and accuracy of data processing;Meanwhile, equipped with 1MB Flash memory, 564KB SRAM, additional 4MB NorFlash and 1MB static SRAM, this rich hardware resource combination not only meets the needs of complex operation and data storage, but also significantly improves the overall reliability and stability of equipment.

[0035] Example 1

[0036] As Figures 1-4As shown, a transformer protection measurement and control device based on main and rear integration includes a case 10, a liquid crystal panel 1, a bus board 2, a main control board 3, an analog input board 5, a switching output board 6 and a switching input board 7, the liquid crystal panel 1, the bus board 2, the main control board 3, the analog input board 5, the switching output board 6 and the switching input board 7 are respectively installed in the case 10, and the device further includes a plurality of cover plates, the cover plates are installed on the case 10 and are respectively connected with the main control board 3, the analog input board 5, the switching output board 6 and the switching input board 7.

[0037] In the embodiment, the liquid crystal panel 1, the bus board 2, the main control board 3, the analog input board 5, the switching output board 6 and the switching input board 7 hardware boards arranged in the case 10 are included.

[0038] The bus board 2 is provided with a plurality of sockets arranged side by side, the main control board 3, the analog input board 5, the switching output board 6 and the switching input board 7 are provided with pins at the front ends, which are respectively connected with the sockets on the bus board 2, and the line boards are sequentially inserted into the corresponding sockets on the bus board 2 through the pins at the front ends.

[0039] The main control board 3, the analog input board 5, the switching output board 6 and the switching input board 7 can be flexibly adjusted in position and arbitrarily plugged according to the actual wiring requirements on site.

[0040] The main control board 3 includes a main control chip unit 31, a storage unit, an output unit 34 and a communication board 4, and the storage unit is installed in the main control chip unit 31.

[0041] The storage unit includes a NorFlash sub-unit 32 and an SRAM sub-unit 33.

[0042] In the embodiment, the analog input board 5, the switching input board 7 and the switching output board 6 and other related resource board cards can be matched according to the actual resource requirements on site.

[0043] The main control board 3 adopts an STM32H723ZGT6 main control chip 31 with a main frequency of 550MHz, and the main control chip is internally configured with a 1MB Flash memory and a 564KB SRAM.

[0044] The main control board is further provided with a 4MB NorFlash 32, a 1MB static SRAM 33 and a two-way 4-20mA output 34. The 4-20mA output 34 can be customized by logic programmable software.

[0045] The communication board 4 includes an RS485 interface 41, an Ethernet interface 42, a GPS interface 43 and a USB interface 44.

[0046] In the embodiment, the communication board 4 is installed on the main control board 3, and includes 3 Ethernet interfaces 42, 1 UBS interface 44, 2 RS485 interfaces 41 and 1 GPS time synchronization interface 43.

[0047] The Ethernet interface 42 supports TCP Modbus-RTU and TCP IEC60870-5-103 protocols, the RS485 interface 41 supports Modbus-RTU and IEC60870-5-103 protocols, the USB interface 44 can be upgraded by a U disk, and can export setting value, event and fault recording data, facilitating fault analysis, and the GPS time synchronization interface 43 can be connected to a time synchronization device to perform time calibration through IRIG-B.

[0048] The analog quantity input board 5 includes a voltage transformer 51, a current transformer 52 and an analog-digital converter, and the voltage transformer 51 and the current transformer 52 are connected to the analog-digital converter.

[0049] In the embodiment, the analog quantity input board 5 is equipped with 32 voltage transformers (PT) 51 and current transformers (CT) 52, and the transformers have flexible conversion capability and can be adjusted as required to meet the accurate requirements of different protection functions. The PT and the CT can realize accurate calculation and analysis of various key electrical parameters including power, electric energy, frequency, harmonic content and differential current by using high-precision synchronous sampling technology and an analog-digital converter (A / D converter).

[0050] The switching quantity output board 6 includes a passive relay output interface 61. The switching quantity output board 6 has 16 passive relay output circuits 61, and can define the output function according to actual requirements.

[0051] The switching quantity input board 7 includes a switching quantity collection circuit 71 and a power module 72. The switching quantity input board 7 includes the switching quantity collection circuit 71 and the power module 72, the switching quantity collection circuit includes 22 active switching quantity input collections, and can be connected to AC / DC 110V or AC / DC 220V signals. The power module 72 supports AC / DC 85V-264V power supply.

[0052] The liquid crystal board 1 includes a liquid crystal screen 11, a key 12 and an indicator light 13, and the liquid crystal screen 11, the key 12 and the indicator light 13 are connected to the bus board 2 respectively.

[0053] In the embodiment, the liquid crystal panel 1 comprises a liquid crystal screen 11, a button 12 and an indicator light 13.

[0054] The transformer protection measurement and control device is designed with a wiring mapping function, and can flexibly configure the voltage and current channel order and in-out direction.

[0055] In addition, the device adopts a processor with a main frequency of 550MHz, 16-bit synchronous sampling A / D, 48-point high-speed sampling per cycle, real-time parallel calculation, centralized design of main protection and backup protection functions, wiring reduction, cost reduction, optional design of differential current and protection current channels, addition of high-low side complex pressure locking function, more stringent protection condition judgment, mature protection principle and anti-interference algorithm, effective protection against protection device malfunctions and misoperation, greatly improved protection sensitivity and reliability, split mounting design of device backplate, independent detachable each board, convenient installation, design of Ethernet and RS485 communication interface, support of TCP IEC60870-5-103, TCP Modbus-RTU, IEC60870-5-103, Modbus-RTU and other protocols, convenient system networking, design of USB interface, user maintenance and internal program update through U disk, export of fault waveform, event record and fixed value parameter after on-site fault, convenient fault analysis and improved user experience.

[0056] The utility model can be widely used in the monitoring and protection of the transformer substation, switching station and distribution station of 110kV and below voltage distribution system, real-time monitoring of the state of each loop transformer, and improvement of the reliable operation of the unattended transformer substation comprehensive automation system.

[0057] The above is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A transformer protection and measurement and control device based on the integration of main and rear transformers, characterized in that: The device comprises a chassis (10), a liquid crystal panel (1), a bus board (2), a main control board (3), an analog input board (5), a switch output board (6) and a switch input board (7), wherein the liquid crystal panel (1), the bus board (2), the main control board (3), the analog input board (5), the switch output board (6) and the switch input board (7) are respectively installed in the chassis (10); the device further comprises a plurality of cover plates, wherein the cover plates are installed on the chassis (10) and are respectively connected to the main control board (3), the analog input board (5), the switch output board (6) and the switch input board (7).

2. A transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 1, characterized in that: The bus board (2) includes a plurality of sockets, and the main control board (3), analog input board (5), switch output board (6) and switch input board (7) all include pins, which are connected to the sockets.

3. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 2 is characterized in that: The sockets are arranged side by side.

4. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 1 is characterized in that: The main control board (3) comprises a main control chip unit (31), a storage unit, an output unit (34) and a communication board (4), wherein the storage unit is installed in the main control chip unit (31).

5. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 4 is characterized in that: The storage unit includes a NorFlash subunit (32) and an SRAM subunit (33).

6. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 4 is characterized in that: The communication board (4) includes an RS485 interface (41), an Ethernet interface (42), a GPS interface (43) and a USB interface (44).

7. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 1 is characterized in that: The analog input board (5) comprises a voltage transformer (51), a current transformer (52) and an analog-to-digital converter, and the voltage transformer (51) and the current transformer (52) are respectively connected to the analog-to-digital converter.

8. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 1 is characterized in that: The switching output board (6) includes a passive relay output interface (61).

9. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 1 is characterized in that: The switching value input board (7) comprises a switching value acquisition circuit (71) and a power supply module (72).

10. The transformer protection and measurement and control device based on the integration of main and rear transformers according to claim 1 is characterized in that: The liquid crystal panel (1) comprises a liquid crystal screen (11), a button (12) and an indicator light (13); the liquid crystal screen (11), the button (12) and the indicator light (13) are respectively connected to the bus board (2).

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