A substation operating box modular design system and operating box

Abstract

The application discloses a substation operating box modular design system and an operating box, and belongs to the field of substation secondary equipment design. The system comprises: a substation unit for determining the number of operating boxes and the functional design requirements and constraint conditions of each operating box; a coding unit for performing bit type spectrum coding on each operating box according to the functional design requirements and constraint conditions; a module selection unit for selecting corresponding operating box models according to the bit type spectrum coding and selecting corresponding functional modules from a preset functional module library; and a module assembly unit for determining the installation positions of the functional modules in the operating boxes. The application can realize the standardized, modular and automated design of the substation operating box, effectively reduce the design and production costs, and facilitate the maintenance and management.

Description

Technical Field

[0001] This invention belongs to the field of substation secondary equipment design, and relates to a modular design system for substation operation boxes and an operation box. Background Technology

[0002] As the core hub for power transmission and distribution in a power system, the reliability and flexibility of the secondary circuit equipment in a substation directly affect the safe and stable operation of the power system. The control box, as a key execution unit of the secondary circuit, undertakes core tasks such as circuit breaker tripping and closing control, AC voltage switching / parallel operation, circuit breaker operating status monitoring, and operating mechanism pressure monitoring. It is also a crucial connection unit between protection devices and circuit breakers.

[0003] Traditional control boxes are integrated designs with fixed functions and poor versatility. They are difficult to troubleshoot, have low reliability, and circuit faults are easy to spread and are cumbersome to repair. They also waste resources, are inflexible in configuration, have many redundant circuits, and cannot be easily adjusted. The function and structure of the control box are complex, and it requires professional technicians to carry out complex designs to adapt to different projects. Research and development and production are time-consuming and costly. Summary of the Invention

[0004] The purpose of this invention is to provide a modular design system and control box for substation control boxes, solving the problems of existing integrated control box designs, such as fixed functions, poor versatility, complex design, long development cycle, and high cost. The technical solution of this invention to achieve the above objective is as follows:

[0005] In a first aspect, the present invention provides a modular design system for a substation operating box, comprising:

[0006] The substation unit is used to construct a substation model based on the primary equipment system diagram and secondary equipment configuration of the target substation, and to determine the number of control boxes and the functional design requirements and constraints of each control box based on the substation model.

[0007] The coding unit is used to perform bit-type spectrum coding on each operation box according to functional design requirements and constraints.

[0008] The module selection unit is used to select the corresponding operation box model according to the bit type spectrum code and to select the corresponding functional module from the preset functional module library; wherein, the functional module is used independently or in combination to realize the functional design requirements;

[0009] The module assembly unit is used to determine the installation position of the functional modules in the operation box. The operation box is equipped with standardized interfaces, and each functional module corresponds to one standardized interface. The functional modules are connected to primary and / or secondary equipment through the standardized interfaces.

[0010] The functional design requirements include one or more of the following: three-phase operation, phase-by-phase operation, AC voltage switching operation, and PT parallel operation, as well as one of the following: line protection, transformer protection, and no protection; the constraints include: module quantity constraints and component type constraints.

[0011] The bit-type spectrum encoding includes:

[0012] The first encoding bit indicates the chassis structure, including a full-layer 4U chassis and a half-layer 4U chassis;

[0013] The second encoding bit indicates the first function of the operation box, including phase-by-phase operation, three-phase operation, AC voltage switching operation and PT parallel operation;

[0014] The third encoding bit indicates the second function of the control box, including line protection, transformer protection, and no protection;

[0015] The fourth encoding bit indicates the number of circuit breaker tripping coils, including single tripping coils, double tripping coils, and no circuit breaker.

[0016] The fifth encoding bit indicates the number of operation loops configured.

[0017] The sixth encoding bit indicates the type of AC voltage relay, including single-position, double-position, and AC voltage-free relays;

[0018] The seventh encoding bit indicates the type of extended relay, including single-position, double-position, and no extended relay.

[0019] The functional modules include: a main functional module and / or an auxiliary functional module. The main functional module includes a trip / close output module, an AC voltage switching module, or an AC voltage parallel module. The auxiliary functional modules include one or more of the following: a DC monitoring module, a pressure monitoring module, and a signal extension module.

[0020] When the second coding bit is a phase-splitting operation or a three-phase operation, the functional module includes: a main functional module and an auxiliary functional module. The number of the main functional modules is the product of the corresponding values ​​of the fourth coding bit and the fifth coding bit.

[0021] When the second encoding bit is an AC voltage switching operation or a PT parallel operation, the functional module includes: a main functional module, and the number of the main functional modules is 1.

[0022] The component type constraints include: AC voltage relay position constraints and extension relay position constraints. The AC voltage relay position constraints are determined according to the configuration type of the secondary equipment side protection device. For a single configuration, a dual-position AC voltage relay is selected, and for a dual configuration, a single-position AC voltage relay is selected. The extension relay position constraints are determined by the extension signal type. For a single-position extension signal, a single-position extension relay is used, and for a dual-position extension signal, a dual-position extension relay is used.

[0023] Secondly, the present invention provides an operating box, which adopts the above-mentioned modular design system for substation operating boxes, including: a chassis, functional modules and standardized interfaces. The functional modules are located inside the chassis, and the standardized interfaces are located on one side of the chassis. The functional modules are connected to primary equipment and secondary equipment through the standardized interfaces.

[0024] The standardized interface includes: a trip and close function layout area, an AC voltage function layout area, and an auxiliary function layout area. The trip and close function layout area is used for the installation of the trip and close output module, the AC voltage function layout area is used for the installation of the AC voltage switching module and the AC voltage parallel module, and the auxiliary function layout area is used for the installation of the DC monitoring module, the pressure monitoring module, and the signal expansion module.

[0025] Beneficial effects

[0026] The modular design system and control box for substation operation boxes of this invention can adapt to different types of substation engineering needs, such as phase / three-phase operation, line / transformer protection, voltage switching / parallel operation, etc., solving the problems of fixed functions and poor versatility of traditional integrated control boxes, and avoiding functional redundancy or insufficiency. Unified coding enables convenient and efficient management. The control box design can be automated, standardized, and modularized based on the coding. The coding can be marked on the device panel to achieve standardized management of control boxes with different configurations and functions, facilitating identification and control in production, procurement, operation and maintenance, and improving the informatization and standardization level of power equipment management. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of the modular design system for the substation control box of the present invention;

[0028] Figure 2 This is the bit pattern spectrum coding diagram of the modular design system for substation control boxes of the present invention;

[0029] Figure 3 This is a simplified circuit diagram of the control box of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] refer to Figure 1 As shown, a modular design system for a substation control box includes:

[0033] The substation unit is used to construct a substation model based on the primary equipment system diagram and secondary equipment configuration within the target substation. It determines the number of control boxes and the functional design requirements and constraints for each control box based on the substation model. The functional design requirements and constraints can be requirements input by the designers or requirements that the system selects autonomously based on the substation model.

[0034] The functional design requirements include one or more of the following: three-phase operation, phase-by-phase operation, AC voltage switching operation, and PT parallel operation; and one of the following: line protection, transformer protection, and no protection. Constraints include: module quantity constraints and component type constraints. The module quantity constraint is determined based on the number of coils and operating circuits of the primary equipment side circuit breaker. Component type constraints include: AC voltage relay position constraints and extension relay position constraints. The AC voltage relay position constraint is determined according to the configuration type of the secondary equipment side protection device; a single-set configuration selects a dual-position AC voltage relay, and a dual-set configuration selects a single-position AC voltage relay. The extension relay position constraint is determined by the extension signal type; a single-position extension signal uses a single-position extension relay, and a dual-position extension signal uses a dual-position extension relay.

[0035] The coding unit performs bit-type spectrum coding for each operation box according to the functional design requirements;

[0036] The module selection unit selects the corresponding operation box model based on the bit spectrum encoding and selects the corresponding functional module from the preset functional module library; the combination of the functional modules is used to realize the functional design requirements.

[0037] The module assembly unit is used to determine the installation position of the functional modules in the control box. The control box is equipped with standardized interfaces, which are divided into trip and close function layout area, AC voltage function layout area and auxiliary function layout area according to the module function. The standardized interfaces realize the corresponding connection between the functional modules and the primary and secondary equipment.

[0038] refer to Figure 3As shown, the functional modules include optional main functional modules and auxiliary functional modules. The main functional modules include a trip / close output module, an AC voltage switching module, and an AC voltage parallel module. The auxiliary functional modules include a DC monitoring module, a pressure monitoring module, and a signal extension module.

[0039] Trip and close output module: Integrates core output functions such as protection tripping, protection closing, tripping and closing current holding, anti-pumping, and position monitoring. Internally, it uses a tripping and closing current holding relay as the core, and forms a circuit with resistors and diodes. The anti-pumping function can be flexibly canceled through jumpers, adapting to different control requirements such as single tripping and single closing and reclosing of circuit breakers. When the tripping and closing output current is ≥1A, the current holding function can be realized by shorting the jumper, adapting to the current requirements of different circuit breakers. Figure 3 The diagram in the middle is a simplified schematic of the trip and close circuit. Relay HBJ is the closing holding relay, relay TBJ is the trip protection relay, and the parallel shunt resistor is adapted to different current requirements.

[0040] AC voltage switching module: It is divided into single-position and dual-position types. Both are based on voltage switching relays and DC power monitoring relays, and are equipped with current-limiting resistors to complete the switching function of two sets of AC voltages in a double bus connection. Figure 3 The diagram below is a simplified schematic of the AC voltage switching circuit. Relay 1YQJ1 is the I bus voltage switching holding relay, relay 1YQJ2 is the I bus voltage switching action relay, relay 2YQJ1 is the II bus voltage switching holding relay, and relay 2YQJ2 is the II bus voltage switching action relay. The two sets of relays work together to achieve the AC voltage switching function.

[0041] AC voltage parallel module: It is divided into two types: single position and double position. It uses the AC voltage parallel relay and isolating switch position as the core to complete the parallel function of two sets of AC voltages. Figure 3 The diagram shows a simplified schematic of the AC voltage parallel circuit. Relay 1PTJ is the parallel relay for bus I voltage, and relay 2PTJ is the parallel relay for bus II voltage. The two sets of relays work together to achieve the AC voltage parallel function by combining the positions of the isolating switch.

[0042] DC monitoring module: It is composed of a DC monitoring relay as the core and a step-down resistor. It provides the DC power supply monitoring function of the control box. When the DC power supply is normal, the DC monitoring relay is energized and works. When the DC is abnormal, the normally closed contact of the relay closes and outputs a DC abnormality signal.

[0043] Pressure monitoring module: It is composed of a pressure monitoring relay as the core and a step-down resistor. It provides four independent pressure monitoring circuits: pressure reduction prohibits tripping, closing, reclosing, and operation. The relay is normally energized and operates normally. When the pressure is abnormal, the coil is short-circuited to lock the circuit and output a central signal. The step-down resistor is configured in the circuit to prevent the resistor from overheating and being damaged after the coil is short-circuited.

[0044] Signal expansion module: includes single-position expansion circuit and dual-position expansion circuit, with the expansion relay as the core, to realize the expansion output of single-position signal and dual-position signal.

[0045] More specifically, relay JJ is a power monitoring relay. When the device is running normally, relay JJ is energized, and its normally closed contact opens. When the device is de-energized, the normally closed contact closes, thereby realizing the power monitoring function. Relay TJ is an extended reclosing relay. After energization, it can be extended with multiple signal nodes for combined use. Relay YJJ is a pressure relay. After energization, it provides a pressure interlocking node. The node is connected in series in the trip and close output circuit through a standardized interface to realize the pressure interlocking function. Relay SHJ is a manual closing reclosing relay, relay STJ is a manual trip reclosing relay, and relay KKJ is a post-closing position monitoring relay. The three sets of relays are used in combination to provide manual closing reclosing node, manual trip reclosing node, and post-closing position monitoring node.

[0046] refer to Figure 2 As shown, in this embodiment, the bit type spectrum encoding of each operating box includes a first encoding bit, a second encoding bit, a third encoding bit, a fourth encoding bit, a fifth encoding bit, a sixth encoding bit, and a seventh encoding bit. The bit functions represented by each encoding bit are as follows: chassis structure, first function, second function, number of circuit breaker trip coils, number of operating circuit configurations, AC voltage relay type, and extension relay type. Among them, the first encoding bit is used to determine the external structure of the operating box, the second and third encoding bits are used to determine the type of internal functional modules of the operating box, the third and fourth encoding bits are used to determine the number of the determined functional modules, and the sixth and seventh encoding bits are used to determine the type of components inside the determined functional modules.

[0047] In this embodiment, the chassis structure includes: a full-layer 4U chassis with a coding value of A, suitable for the combined deployment of multiple functional modules, and a half-layer 4U chassis with a coding value of B; the first function of the operation box includes: phase-by-phase operation with a coding value of F, three-phase operation with a coding value of S, AC voltage switching operation with a coding value of Q, and PT parallel operation with a coding value of P; the second function of the operation box includes: line protection with a coding value of L, transformer protection with a coding value of T, no protection with a coding value of 0, circuit breaker tripping coil number: single coil with a coding value of 1, double coil with a coding value of 2, no circuit breaker with a coding value of 0; number of operation circuits configured: coding value of 0~5; AC voltage relay type: single position with a coding value of 1, double position with a coding value of 2, no AC voltage relay with a coding value of 0; extension relay type: single position with a coding value of 1, double position with a coding value of 2, no extension relay with a coding value of 0.

[0048] The coding bits for AC voltage relay types are used to constrain the relay selection for AC voltage parallel modules and AC voltage switching modules, ensuring that the entire substation system can operate in a matched manner.

[0049] For the FL, SL, FT, and ST operation boxes, the number of main function modules is equal to the product of the corresponding values ​​of the fourth and fifth coding bits; for the Q0 and P0 operation boxes, the number of main function modules is 1.

[0050] It should be noted that the number of bits in the bit pattern spectrum encoding described in this application is not limited to the aforementioned 7 bits, nor is it limited to the corresponding bit function description. Relevant personnel may add, change, or delete bits according to actual design requirements, all of which fall within the protection scope of this application.

[0051] Example 2

[0052] For a 220kV substation, the designer, based on the existing substation model, inputs the corresponding functional design requirement into the system: PT parallel operation is required, and the AC voltage relay type is single-position. Combining the bit type spectrum coding, the single-function implementation chassis structure is selected as a half-layer 4U chassis; therefore, the first coded bit is B. Because the input functional design requirement is PT parallel operation, the second coded bit is P. The third, fourth, fifth, and seventh coded bits are 0 because the function is not used. Since the input AC voltage relay type is single-position, the sixth coded bit is 1. The corresponding bit type spectrum coding result for the operating box is: BP00010. Based on the bit type spectrum coding structure, a half-layer 4U chassis is selected. The single-position voltage parallel module is installed inside the chassis, and product assembly and delivery are completed through a standardized interface.

[0053] Example 3

[0054] For a 220kV line protection substation project, according to the engineering design requirements, the chassis is designed as a full-layer 4U chassis. The functional design requirements of the operating box are phase-by-phase operation and line protection, with two circuit breaker trip coils, and an additional single-position extension circuit for signal expansion. Based on the type spectrum coding, multiple functional modules need to be combined for deployment. The selected chassis structure is a full-layer 4U chassis. The first coding bit is A, the second coding bit is P (for phase-by-phase operation), the third coding bit is L (for line protection), the fourth coding bit is 2 (for dual trip coils), the fifth coding bit is 1 (for use in one operating circuit), the sixth coding bit is 1 (for single-position voltage switching), and the seventh coding bit is 1 (for single-position extension circuit). The corresponding type spectrum coding result for the operating box is: AFL2111. During implementation, a full-layer 4U chassis is selected according to the aforementioned type spectrum coding structure. The chassis houses a trip / close output module, a pressure monitoring module, a DC monitoring module, and a signal expansion module. The number of trip / close output modules is two. Product assembly and delivery are completed through standardized interfaces.

[0055] Example 4

[0056] For the 110kV substation project, based on its primary equipment system diagram and secondary equipment configuration, the substation is equipped with two 110kV incoming lines, one main transformer, and three-phase circuit breakers. The 110kV side adopts a single busbar segmented connection, and the secondary equipment of the 110kV substation is configured as a single set. Among them, the primary main wiring diagram is a single busbar segmented connection, so there is a need for voltage paralleling. The AC voltage relay adopts a dual-position method, which requires one operating box for voltage paralleling, with a position spectrum code of BP00020. The three-phase circuit breaker is a single-coil mode. Because it adopts a single busbar segmented connection method, the line operating box does not need to be configured with a voltage switching module. At the same time, considering the signal expansion needs of the line bay, the line operating box can reserve an expansion circuit. At this time, two operating boxes for line protection are also required, with a position spectrum code of ASL1101. The main transformer is configured on both high and low voltage sides, so the operating circuit is configured on both high and low voltage sides, with no voltage switching requirement and no need for expansion circuit. At this time, one operating box for transformer protection is also required, with a position spectrum code of AST1200. In summary, a 110kV substation project requires the delivery of two ASL1101 control boxes, one AST1200 control box, and one BP00020 control box.

[0057] For the ASL1101 operating box, a full-layer 4U chassis is selected according to the bit spectrum encoding result. The chassis is equipped with a trip and close output module, a pressure monitoring module, a DC monitoring module and a signal expansion module. The number of trip and close output modules is 1.

[0058] The corresponding AST1200 operating box selects a full-layer 4U chassis based on the bit spectrum encoding result. The chassis is equipped with a trip and close output module, a pressure monitoring module, a DC monitoring module, and a signal expansion module. The number of trip and close output modules is 2.

[0059] According to the bit spectrum encoding result, the corresponding BP00020 operation box selects a half-layer 4U chassis, and the chassis is equipped with an AC voltage parallel module.

[0060] Example 5

[0061] An operating box includes: a chassis, a functional module, and a standardized interface. The functional module is disposed inside the chassis, and the standardized interface is disposed on one side of the chassis. The functional module is connected to primary equipment and secondary equipment through the standardized interface.

[0062] The standardized interface includes: a trip and close function layout area, an AC voltage function layout area, and an auxiliary function layout area. The trip and close function layout area is used for the installation of trip and close output modules, the AC voltage function layout area is used for the installation of AC voltage switching modules and AC voltage parallel modules, and the auxiliary function layout area is used for the installation of DC monitoring modules, pressure monitoring modules, and signal expansion modules.

[0063] In summary, the modular design system and control box of the substation control box of this invention can adapt to different types of substation engineering needs such as phase / three-phase operation, line / transformer protection, voltage switching / parallel operation, etc., solving the problems of fixed functions and poor versatility of traditional integrated control boxes, and avoiding functional redundancy or insufficiency. Unified coding ensures convenient and efficient management. The control box design can be fully automated based on the coding, which can be marked on the device panel to achieve standardized management of control boxes with different configurations and functions. This facilitates identification and control in production, procurement, operation and maintenance, and improves the informatization and standardization level of power equipment management. Modular design significantly improves operation and maintenance efficiency. Each module is a functionally independent unit, which can be directly plugged in and replaced in case of failure without disassembling the entire control box. External wiring does not need to be modified, and maintenance time is reduced from more than 2 hours to less than 10 minutes. The independent functions between modules prevent module failures from coupling, reducing the scope of fault impact and improving system reliability. Anti-pumping and trip / close current functions can be flexibly configured via jumpers without redesigning circuits, adapting to the control requirements of different circuit breakers. Integrating functions such as pressure interlocking, anti-pumping, DC power supply monitoring, and control circuit disconnection detection, this circuit breaker provides comprehensive protection during operation. The monitoring circuit is equipped with a step-down resistor to prevent overheating damage after coil short-circuiting, further enhancing operational safety. Standardized interface design reduces total lifecycle costs. All modules use standardized mechanical and electrical interfaces, enabling mass production and reuse without the need for repeated R&D for different projects, shortening the development cycle and reducing costs. On-demand module configuration reduces material consumption and production time, lowering production costs. Faulty modules can be repaired or replaced individually, reducing spare parts inventory and maintenance costs. Flexible expansion adapts to intelligent upgrades, allowing for easy integration of new auxiliary function modules without large-scale modifications to existing systems, meeting the needs of intelligent substation upgrades and extending equipment lifespan.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A modular design system for a substation control box, characterized in that, include: The substation unit is used to construct a substation model based on the primary equipment system diagram and secondary equipment configuration of the target substation, and to determine the number of control boxes and the functional design requirements and constraints of each control box based on the substation model. The coding unit is used to perform bit-type spectrum coding on each operation box according to functional design requirements and constraints. The module selection unit is used to select the corresponding operation box model according to the bit type spectrum encoding and to select the corresponding functional module from the preset functional module library; wherein, the functional module is used independently or in combination to realize the functional design requirements; The module assembly unit is used to determine the installation position of the functional modules in the operation box. The operation box is equipped with standardized interfaces, and each functional module corresponds to one standardized interface. The functional modules are connected to primary and / or secondary equipment through the standardized interfaces.

2. The modular design system for substation control boxes according to claim 1, characterized in that, The functional design requirements include one or more of the following: three-phase operation, phase-by-phase operation, AC voltage switching operation, and PT parallel operation, as well as one of the following: line protection, transformer protection, and no protection; the constraints include: module quantity constraints and component type constraints.

3. The modular design system for substation control boxes according to claim 1, characterized in that, The bit-type spectrum encoding includes: The first encoding bit indicates the chassis structure, including a full-layer 4U chassis and a half-layer 4U chassis; The second encoding bit indicates the first function of the operation box, including phase-by-phase operation, three-phase operation, AC voltage switching operation and PT parallel operation; The third encoding bit indicates the second function of the control box, including line protection, transformer protection, and no protection; The fourth encoding bit indicates the number of circuit breaker tripping coils, including single tripping coils, double tripping coils, and no circuit breaker. The fifth encoding bit indicates the number of operation loops configured. The sixth encoding bit indicates the type of AC voltage relay, including single-position, double-position, and AC voltage-free relays; The seventh encoding bit indicates the type of extended relay, including single-position, double-position, and no extended relay.

4. The modular design system for substation control boxes according to claim 1, characterized in that, The functional modules include: a main functional module and / or an auxiliary functional module. The main functional module includes a trip / close output module, an AC voltage switching module, or an AC voltage parallel module. The auxiliary functional modules include one or more of the following: a DC monitoring module, a pressure monitoring module, and a signal extension module.

5. The modular design system for substation control boxes according to claim 3, characterized in that, When the second coding bit is a phase-splitting operation or a three-phase operation, the functional module includes: a main functional module and an auxiliary functional module. The number of the main functional modules is the product of the corresponding values ​​of the fourth coding bit and the fifth coding bit.

6. The modular design system for substation control boxes according to claim 3, characterized in that, When the second encoding bit is an AC voltage switching operation or a PT parallel operation, the functional module includes: a main functional module, and the number of the main functional modules is 1.

7. The modular design system for substation control boxes according to claim 2, characterized in that, The component type constraints include: AC voltage relay position constraints and extension relay position constraints. The AC voltage relay position constraints are determined according to the configuration type of the secondary equipment side protection device. For a single configuration, a dual-position AC voltage relay is selected, and for a dual configuration, a single-position AC voltage relay is selected. The extension relay position constraints are determined by the extension signal type. For a single-position extension signal, a single-position extension relay is used, and for a dual-position extension signal, a dual-position extension relay is used.

8. An operating box, characterized in that, The control box adopts the modular design system of substation control box according to any one of claims 1 to 7, including: a chassis, a functional module and a standardized interface. The functional module is set inside the chassis, and the standardized interface is set on one side of the chassis. The functional module is connected to primary equipment and secondary equipment through the standardized interface.

9. The operating box according to claim 8, characterized in that, The standardized interface includes: a trip and close function layout area, an AC voltage function layout area, and an auxiliary function layout area. The trip and close function layout area is used for the installation of the trip and close output module, the AC voltage function layout area is used for the installation of the AC voltage switching module and the AC voltage parallel module, and the auxiliary function layout area is used for the installation of the DC monitoring module, the pressure monitoring module, and the signal expansion module.

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