Simplified method for three power supply single bus sectionalization wiring spare power automatic switching device

Abstract

The application discloses a simplified method of three power supply single bus sectional wiring backup power automatic switching, which can be applied to 220kV and below voltage grade transformer substations, simplifies three power supply single bus sectional wiring backup power automatic switching into several simple wiring backup power automatic switching, and verifies the correctness of the wiring backup power automatic switching operation mode by using logic algebra, wherein the logic algebra expression of the backup power automatic switching operation mode is ABCD+ABCD+ABCD+ABCD+ABCD+ABCD+ABCD+ABCD+ABCD. The application makes the complex mode simple and clear, and is helpful to complete the analysis of the backup power automatic switching action logic. The three simple backup power automatic switching simplified from the three power supply single bus sectional wiring backup power automatic switching is a common backup power automatic switching form of power grids, and does not need to be redesigned and produced. Only corresponding logic setting needs to be performed between the existing simple backup power automatic switching, and the complex wiring backup power automatic switching function demand can be adapted.

Description

Technical Field

[0001] This invention relates to a simplified method for a single busbar segmented connection with backup automatic transfer in a three-power supply system, belonging to the field of power transmission and distribution network control technology. Background Technology

[0002] In practical engineering applications, some 110kV substations have a single busbar segmented connection with three power supplies. Due to the multiple power inputs, the automatic transfer switch (ATS) for backup power supplies in this connection configuration has diverse operating modes, with up to nine possible modes listed exhaustively. Currently, there are no related ATS products on the market for this type of connection, requiring separate design. The logic of this type of ATS, constructed using the exhaustive method, is complex, and there are issues with the difficulty or incompleteness of exhaustively listing all possible operating modes. Engineering experience shows that complex ATS connections can be simplified into multiple simpler ATS connections. Existing technologies have not solved the simplification problem of ATS with a single busbar segmented connection for three power supplies. This invention proposes a simplified method for ATS with a single busbar segmented connection for three power supplies and uses Boolean algebra to verify the correctness of the operating mode of this ATS connection. Summary of the Invention

[0003] The purpose of this invention is to provide a simplified method for automatic transfer switching of a single busbar with three power supplies in a segmented configuration. This method can be applied to substations with voltage levels of 220kV and below. It simplifies the automatic transfer switching of a single busbar with three power supplies in a segmented configuration into several simple automatic transfer switches, and verifies the correctness of the automatic transfer switching operation mode using Boolean algebra.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A simplified method for a three-power supply single busbar segmented connection backup automatic transfer system is proposed, which simplifies the complex backup automatic transfer system into a system consisting of two single busbar segmented connection backup automatic transfer systems and one single busbar connection backup automatic transfer system.

[0006] When the power supply of Line 1 and Line 2 is running and the power supply of Line 3 is not running, it is the first single busbar sectionalized connection backup automatic transfer, that is, the first single busbar sectionalized connection backup automatic transfer is composed of the power supply of Line 1, the power supply of Line 2, circuit breaker QF1, circuit breaker QF2, and circuit breaker QF3.

[0007] When the power supply of Line 1 and Line 3 is running and the power supply of Line 2 is not running, it is the second single busbar sectionalized connection backup automatic transfer, that is, the second single busbar sectionalized connection backup automatic transfer is composed of the power supply of Line 1, the power supply of Line 3, circuit breaker QF1, circuit breaker QF2, and circuit breaker QF4.

[0008] When the power supply of Line 2 or Line 3 is in operation and circuit breaker QF2 is in cold standby, or when the power supply of Line 1 is not in operation, the power supply of Line 2 or Line 3 is in operation and circuit breaker QF2 is in operation, it is a single busbar connection for automatic transfer, that is, the power supply of Line 2, the power supply of Line 3, circuit breaker QF3, and circuit breaker QF4 form a single busbar connection for automatic transfer.

[0009] The logical algebraic expression satisfied by the first single-busbar segmented connection standby automatic transfer operation mode is:

[0010]

[0011] The logical algebraic expression satisfied by the second single-busbar segmented connection automatic transfer operation mode is:

[0012]

[0013] The logical algebraic expression satisfied by the single busbar connection automatic transfer operation mode is:

[0014]

[0015] The logical relationship between the first single-busbar segmented connection backup automatic transfer, the second single-busbar segmented connection backup automatic transfer, and the single-busbar connection backup automatic transfer is "OR". Considering the actual power grid operation requirements, the integrated and simplified logical algebraic expression for the operation mode of the three-power supply single-busbar segmented connection backup automatic transfer is:

[0016]

[0017] Where A, B, C, and D represent the closed operating states of circuit breakers QF1, QF2, QF3, and QF4, respectively, represented by 1 in Boolean algebra. These represent circuit breakers QF1, QF2, QF3, and QF4 respectively in a non-closing operating state, which is represented by 0 in Boolean algebra.

[0018] In the above formula, the logical algebraic expression of each field represents one operating mode of a three-power supply single bus section connection with automatic transfer backup, for a total of 9 operating modes.

[0019] The objective of this invention can also be further achieved through the following technical measures:

[0020] The simplified method for automatic transfer switching of a single busbar with three power supplies mentioned above applies as follows: when power supplies for Line 1 and Line 2 are operating and power supply for Line 3 is not operating, the first automatic transfer switch with single busbar sectional connection is used first; when power supplies for Line 1 and Line 3 are operating and power supply for Line 2 is not operating, the second automatic transfer switch with single busbar sectional connection is used first; when power supplies for Line 2 or Line 3 are operating and circuit breaker QF2 is in cold standby mode, or when power supply for Line 1 is not operating, power supplies for Line 2 or Line 3 are operating and circuit breaker QF2 is operating, the automatic transfer switch with single busbar connection is used first.

[0021] The aforementioned simplified method for automatic transfer switching of a single busbar with three power supplies is implemented by remotely or locally engaging or disengaging the automatic transfer switch.

[0022] The aforementioned simplified method for three-power supply single busbar segmented connection backup automatic transfer, wherein the first single busbar segmented connection backup automatic transfer, the second single busbar segmented connection backup automatic transfer, and the single busbar connection backup automatic transfer are electromagnetic backup automatic transfer devices or microcomputer backup automatic transfer devices.

[0023] The simplified method for the aforementioned three-power supply single busbar segmented wiring backup automatic transfer is implemented by integrating three backup automatic transfer logics into a single PLC backup automatic transfer device, where the first single busbar segmented wiring backup automatic transfer, the second single busbar segmented wiring backup automatic transfer, and the single busbar wiring backup automatic transfer logic are all implemented by integrating three backup automatic transfer logics.

[0024] The simplified method for the aforementioned three-power supply single busbar segmented wiring backup automatic transfer system is implemented by integrating three backup automatic transfer logics into a microcomputer backup automatic transfer device, where the first single busbar segmented wiring backup automatic transfer, the second single busbar segmented wiring backup automatic transfer, and the single busbar wiring backup automatic transfer logic are all implemented by integrating three backup automatic transfer logics.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The method of this invention simplifies the complex operation mode of three-power supply single busbar segmented wiring backup automatic transfer to three simple wiring backup automatic transfers, including two single busbar segmented wiring backup automatic transfers and one single busbar wiring backup automatic transfer, making the complex mode simple and clear, which helps to complete the analysis of the operation logic of this complex backup automatic transfer.

[0027] 2. The simplified three-power supply single busbar segmented wiring backup automatic transfer system allows the three simple backup automatic transfer devices to operate separately. When some equipment in the system's primary wiring stops operating, some backup automatic transfer devices can also be activated, avoiding the complete shutdown of the backup automatic transfer device due to changes in wiring methods or equipment outages. This improves operational flexibility and enhances the functionality and applicability of the backup automatic transfer device.

[0028] 3. The logical algebraic expression of the three-power supply single bus segmented wiring backup automatic transfer provided by the present invention is simple, clear and easy to understand, and convenient to implement and apply. At the same time, it verifies the correctness of the simplified operation mode.

[0029] 4. The three simplified automatic transfer switches of the single busbar segmented wiring with three power supply are common automatic transfer switch forms in the power grid. They do not require redesign or remanufacturing. Only the corresponding logic settings between the existing simple automatic transfer switches are needed to adapt to the automatic transfer switch function requirements of complex wiring. Attached Figure Description

[0030] Figure 1 This is the primary main wiring diagram of the three-power supply single busbar segmented wiring method applied in the simplified method of this invention;

[0031] Figure 2 This is the first single-busbar segmented wiring primary main wiring diagram in the simplified method of the present invention;

[0032] Figure 3 This is the second single-busbar segmented wiring primary main wiring diagram in the simplified method of the present invention;

[0033] Figure 4 is a single busbar primary wiring diagram in the simplified method of the present invention. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figure 1 As shown, in the primary main wiring of the substation of the power transmission and distribution network to which the method of the present invention is applied, it is a standard three-power supply single busbar segmented wiring, with three power supply incoming lines, namely Line 1, Line 2 and Line 3. The wiring includes circuit breakers QF1, QF2, QF3 and QF4, 110kV Section I busbar, 110kV Section II busbar, transformer No. 1 and transformer No. 2. Among them, the incoming power circuit breakers for Line 1, Line 2, and Line 3 are circuit breakers QF1, QF3, and QF4, respectively, and circuit breaker QF2 is a sectional circuit breaker. Line 1 supplies power to the 110kV Section I busbar, and transformer No. 1 is connected to the 110kV Section I busbar. Line 2 and Line 3 supply power to the 110kV Section II busbar, and transformer No. 2 is connected to the 110kV Section II busbar. Voltage transformers TV1 and TV2 are connected to the 110kV Section I busbar and the 110kV Section II busbar, respectively.

[0036] The simplified process of this invention is specifically implemented as follows:

[0037] 1. Simplification of three-power supply single busbar segmented wiring and its automatic transfer switch

[0038] 1.1 Three-power supply single busbar segmented wiring backup automatic transfer operation mode

[0039] The primary main wiring diagram for a three-power supply single busbar segmented connection is shown below. Figure 1 Based on actual operating experience of power systems, it is known that in the three power supply connections of the voltage level described in this invention, since each pair of power supplies (i.e., between line 1 and line 2, between line 2 and line 3, and between line 1 and line 3) cannot operate in parallel for a long time, for the equipment status in the primary connection, that is, at least one circuit breaker in the loop between each pair of power supplies should be in a non-closed operating state. Using the "exhaustive method", nine operating modes of the three-power supply single busbar segmented connection with automatic transfer backup are listed, including those in Table 1.

[0040] Table 1. Possible Operating Modes for Three-Power Supply Single Busbar Sectional Connection with Automatic Transfer Switch.

[0041] 1 <![CDATA[QF1、QF2]]> <![CDATA[QF3、QF4]]> <![CDATA[When the incoming line 1 loses power, trip QF1 and put QF3 or QF4 into operation]]> 2 <![CDATA[QF1、QF3]]> <![CDATA[QF2、QF4]]> <![CDATA[When the incoming line 1 loses power, trip QF1 and close QF2; when the incoming line 2 loses power, trip QF3 and close QF2 or close QF4]]> 3 <![CDATA[QF2、QF4]]> <![CDATA[QF1、QF3]]> <![CDATA[When the incoming line 3 loses power, trip QF4 and put QF1 or QF3 into operation]]> 4 <![CDATA[QF2、QF3]]> <![CDATA[QF1、QF4]]> <![CDATA[When the incoming line 2 loses power, trip QF3 and put QF1 or QF4 into operation]]> 5 <![CDATA[QF1、QF4]]> <![CDATA[QF2、QF3]]> <![CDATA[When the incoming line 1 loses power, trip QF1 and close QF2; when the incoming line 3 loses power, trip QF4 and close QF2 or close QF3]]> 6 <![CDATA[QF1]]> <![CDATA[QF2、QF3、QF4]]> <![CDATA[When the incoming line 1 loses power, trip QF1 and close QF2 and QF3, or close QF2 and QF4]]> 7 <![CDATA[QF4]]> <![CDATA[QF1、QF2、QF3]]> <![CDATA[When the incoming line 3 loses power, trip QF4, close QF3 or close QF1 and QF2]]> 8 <![CDATA[QF3]]> <![CDATA[QF1、QF2、QF4]]> <![CDATA[When the incoming line 2 loses power, trip QF3 and switch on QF4, or switch on QF1 and QF2]]>

[0042] Note: Regardless of whether Line 1, Line 2, or Line 3 in a single wiring connection is in operation or not, the corresponding automatic transfer switch is considered to be in operation when it is not in use.

[0043] 1.2 Simplification of Three-Power Supply Single Busbar Sectional Wiring and Automatic Transfer Switch

[0044] 1.2.1 Simplification of segmented wiring for a single busbar in a three-power supply system

[0045] right Figure 1 The primary main wiring of a single busbar segmented power supply system with three power sources is simplified. When power sources 1 and 2 are operating and power source 3 is not operating, the primary main wiring of the first single busbar segmented power supply system is formed, and its primary wiring consists of circuit breakers QF1, QF2, and QF3 (see...). Figure 2 The power supply to the 110kV Section I and Section II busbars is controlled by circuit breakers QF1, QF2 and QF3, with circuit breaker QF2 being a sectional circuit breaker.

[0046] When the power supplies for Line 1 and Line 3 are operational, and the power supply for Line 2 is not operational, the second single busbar segment primary main wiring is configured, consisting of circuit breakers QF1, QF2, and QF4 (see...). Figure 3 The power supply to the 110kV Section I and Section II busbars is controlled by circuit breakers QF1, QF2 and QF4, with circuit breaker QF2 being a sectional circuit breaker.

[0047] When the power supply of Line 2 or Line 3 is in operation and circuit breaker QF2 is in cold standby, or when the power supply of Line 1 is not in operation, the power supply of Line 2 or Line 3 is in operation and circuit breaker QF2 is in operation, it is a single busbar connection primary main connection (see Figure 4), in which the power supply of the 110kV II section busbar is controlled by circuit breaker QF3 or QF4.

[0048] 1.2.2 Simplification of Three-Power Supply Single Busbar Sectional Wiring with Automatic Transfer Switch

[0049] As can be seen from the above analysis, the three-power supply single busbar segmented wiring can be simplified into three simple primary main wirings, that is, it can be composed of two single busbar segmented wirings and one single busbar wiring. Therefore, the three-power supply single busbar segmented wiring backup automatic transfer can be composed of two single busbar segmented wiring backup automatic transfers and one single busbar wiring backup automatic transfer.

[0050] 2. Simplified operation mode of three-power supply single busbar segmented wiring with automatic transfer switch: logical algebraic expression and correctness verification.

[0051] 2.1 Mathematical Model of Automatic Switching

[0052] Can the automatic transfer switch (ATS) of a three-power supply single busbar sectionalized connection be simplified to consist of two single busbar sectionalized ATSs and one single busbar ATS? The correctness of this simplification method can be proven using Boolean algebra. The opening and closing states of a circuit breaker can be represented by Boolean algebra, where 1 indicates that the circuit breaker is in a closed operating state, and 0 indicates that the circuit breaker is in a non-closed operating state. Figure 1 Circuit breakers QF1, QF2, QF3, and QF4 are represented by A, B, C, and D, respectively. A, B, C, and D represent the closed operating state of circuit breakers QF1, QF2, QF3, and QF4, respectively, and are represented by 1 using Boolean algebra. These represent circuit breakers QF1, QF2, QF3, and QF4 in a non-closing operating state, respectively, and are represented by 0 in Boolean algebra.

[0053] 2.1.1 Mathematical Model for the First Single Busbar Segmented Connection with Automatic Transfer Switch

[0054] like Figure 2 As shown, the operation and non-operation of the primary main wiring circuit breakers QF1, QF2, and QF3 constitute the six operating modes of the first single busbar sectionalized automatic transfer switch, one of which is the deactivation mode:

[0055] a. Circuit breakers QF1 and QF3 are in operation, with circuit breaker QF2 as the standby switch. When line one loses power, circuit breaker QF1 trips and circuit breaker QF2 is switched on. When line two loses power, circuit breaker QF3 trips and circuit breaker QF2 is switched on. The logical algebraic expression for its operation mode is:

[0056] b. Circuit breakers QF1 and QF2 are in operation, with circuit breaker QF3 as the standby circuit breaker; when the line loses power, circuit breaker QF1 trips and circuit breaker QF3 is switched on. The logical algebraic expression for its operation mode is:

[0057] c. Circuit breakers QF2 and QF3 are in operation, with circuit breaker QF1 as the backup; when line two loses power, circuit breaker QF3 trips and circuit breaker QF1 is switched on. The logical algebraic expression for its operation mode is:

[0058] d. Circuit breaker QF1 is in operation, with circuit breakers QF2 and QF3 on standby. When the line loses power, circuit breaker QF1 trips, and circuit breakers QF3 and QF2 are put into operation. The logical algebraic expression for its operation mode is:

[0059] e. Circuit breaker QF3 is in operation, with circuit breakers QF1 and QF2 on standby. When line two loses power, circuit breaker QF3 trips, and circuit breakers QF1 and QF2 are put into operation. The logical algebraic expression for its operation mode is:

[0060] f. Regardless of whether Line 1, Line 2, or Line 3 in a single wiring connection is in operation or deactivated, the deactivated mode is defined as the corresponding automatic transfer switch not operating. The logical algebraic expression for this operation mode is:

[0061] Therefore, the logical algebraic expression satisfied by the first single-busbar segmented connection automatic transfer operation mode is equation (5):

[0062]

[0063] 2.1.2 Mathematical Model for the Second Single Busbar Segmented Connection with Automatic Transfer Switch

[0064] like Figure 3 As shown, the operation and non-operation of the primary main wiring circuit breakers QF1, QF2, and QF4 constitute the six operating modes of the second single busbar sectionalized automatic transfer switch, one of which is the deactivation mode:

[0065] a. Circuit breakers QF1 and QF4 are in operation, with circuit breaker QF2 as the standby switch. When line one loses power, circuit breaker QF1 trips and circuit breaker QF2 is switched on. When line three loses power, circuit breaker QF4 trips and circuit breaker QF2 is switched on. The logical algebraic expression for its operation mode is:

[0066] b. Circuit breakers QF1 and QF2 are in operation, with circuit breaker QF4 as the backup; when the line loses power, circuit breaker QF1 trips and circuit breaker QF4 is switched on. The logical algebraic expression for its operation mode is:

[0067] c. Circuit breakers QF2 and QF4 are in operation, with circuit breaker QF1 as the backup; when line three loses power, circuit breaker QF4 trips and circuit breaker QF1 is switched on. The logical algebraic expression for its operation mode is:

[0068] d. Circuit breaker QF1 is in operation, with circuit breakers QF2 and QF4 on standby. When the line loses power, circuit breaker QF1 trips, and circuit breakers QF4 and QF2 are put into operation. The logical algebraic expression for its operation mode is:

[0069] e. Circuit breaker QF4 is in operation, with circuit breakers QF1 and QF2 on standby. When line three loses power, circuit breaker QF4 trips, and circuit breakers QF1 and QF2 are put into operation. The logical algebraic expression for its operation mode is:

[0070] f. Regardless of whether Line 1, Line 2, or Line 3 in a single wiring connection is in operation or deactivated, the deactivated mode is defined as the corresponding automatic transfer switch not operating. The logical algebraic expression for this operation mode is:

[0071] Therefore, the logical algebraic expression satisfied by the second single-busbar segmented connection automatic transfer operation mode is equation (6):

[0072]

[0073] 2.1.3 Mathematical Model for Automatic Transfer Switching in Single Busbar Connection

[0074] As shown in Figure 4, the operation and non-operation of circuit breakers QF3 and QF4 constitute three operating modes for this type of single busbar connection with automatic transfer switch, one of which is the shutdown mode:

[0075] a. Circuit breaker QF3 is in operation, with circuit breaker QF4 as the backup; when line two loses power, circuit breaker QF3 trips and circuit breaker QF4 is put on. The logical algebraic expression for its operation mode is:

[0076] b. Circuit breaker QF4 is in operation, with circuit breaker QF3 as the backup; when line three loses power, circuit breaker QF4 trips and circuit breaker QF3 is put on. The logical algebraic expression for its operation mode is:

[0077] c. Regardless of whether Line 2 or Line 3 in a single wiring connection is in operation or deactivated, the deactivated mode is defined as the corresponding automatic transfer switch not operating. The logical algebraic expression for this operation mode is:

[0078] Therefore, the logical algebraic expression satisfied by this operating mode is equation (7):

[0079]

[0080] 2.2 Simplified Theoretical Analysis of Single Busbar Sectional Wiring and Automatic Transfer Switching for Three-Power Supply

[0081] A full wiring analysis is performed on the three simplified automatic transfer switch (ATS) operation modes. From 1.2.1, it is known that in the first single-busbar sectionalized ATS operation mode, circuit breaker QF4 does not operate. Combining this with 2.1.1, the logical algebraic expression satisfied in this case is equation (8):

[0082]

[0083] As shown in 1.2.1, under the second single busbar sectionalized automatic transfer switch operation mode, circuit breaker QF3 does not operate. Combined with 2.1.2, the logical algebraic expression satisfied in this case is equation (9):

[0084]

[0085] As shown in 1.2.1, in the single busbar connection automatic transfer operation mode, Case 1: As shown in Figure 4(a), the primary main connection circuit breaker QF2 is in cold standby, that is, circuit breaker QF2 is not in operation, and circuit breaker QF1 can be in operation or not in operation. Combining with 2.1.3, therefore, the logical algebraic expression satisfied by this operation mode is equation (10):

[0086]

[0087] Case 2: As shown in Figure 4(b), in the primary main wiring, the power supply of line one is not operating, the power supply of line two or line three is operating, and circuit breaker QF2 is operating, that is, circuit breaker QF2 is operating and circuit breaker QF1 is not operating. The logical algebraic expression satisfied by this operating mode is equation (11):

[0088]

[0089] Based on the analysis of both scenarios 1 and 2, the logical algebraic expression satisfied by the single busbar connection automatic transfer operation mode is equation 12:

[0090]

[0091] The logical relationship between the first single-busbar segmented connection backup automatic transfer, the second single-busbar segmented connection backup automatic transfer, and the single-busbar connection backup automatic transfer is an "OR" logical relationship. Therefore, the simplified logical algebraic expression for the three-power supply single-busbar segmented connection backup automatic transfer operation mode is as follows:

[0092]

[0093] Calculate and rearrange equation 13, considering that no two power sources (i.e., between line 1 and line 2, between line 2 and line 3, and between line 1 and line 3) can operate in parallel for extended periods. For the equipment status in a single wiring configuration, circuit breakers QF1, QF2, and QF3 cannot be closed simultaneously, or circuit breakers QF1, QF2, and QF4 cannot be closed simultaneously, or circuit breakers QF3 and QF4 cannot be closed simultaneously. Also consider... Since this is a non-existent operating mode, equation (13) becomes:

[0094]

[0095] In formula ⒁, the Boolean algebraic expression of each field represents one operating mode of the three-power supply single bus sectionalized wiring backup automatic transfer system. If formula ⒁ has 9 fields, it means that the simplified three-power supply single bus sectionalized wiring backup automatic transfer system has 9 operating modes.

[0096] 2.3 Comparison of Operating Modes

[0097] The results of the automatic transfer switch (ATS) operation mode of the three-power supply single busbar segmented wiring, obtained through Boolean algebraic calculations, were compared with the operation modes obtained by the "exhaustive method" shown in Table 1. This verified that the simplified ATS operation mode is the same as the operation modes listed by the "exhaustive method," meaning their operational effects are identical. Furthermore, the Boolean algebraic expression for the three-power supply single busbar segmented wiring decomposed by the method of this invention is simple, clear, easy to understand, and convenient to implement.

[0098] To achieve better and safer operation, the following technical measures need to be taken: The simplified method of single busbar sectionalized backup automatic transfer switch (SATS) for three-power supply systems is as follows: When Line 1 and Line 2 are powered, and Line 3 is not operating, the first single busbar sectionalized backup automatic transfer switch should be used first. When Line 1 and Line 3 are powered, and Line 2 is not operating, the second single busbar sectionalized backup automatic transfer switch should be used first. When Line 2 or Line 3 is operating and circuit breaker QF2 is in cold standby mode, or when Line 1 is not operating, Line 2 or Line 3 is operating, and circuit breaker QF2 is operating, the single busbar backup automatic transfer switch should be used first.

[0099] This invention provides a simplified automatic transfer switch (ATS) logic for single busbar segmented wiring with three power supplies. In specific engineering implementations, the implementation of the first, second, and single busbar segmented wiring ATS logics can be achieved by integrating three ATS logics into one ATS device, or by combining multiple ATS devices. The ATS devices used are electromagnetic or microcomputer-based.

[0100] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A simplified method for a three-power supply single busbar sectionalized wiring system with automatic transfer switch, wherein circuit breakers QF1, QF3, and QF4 are the incoming power circuit breakers for Line 1, Line 2, and Line 3, respectively, and circuit breaker QF2 is the sectionalizing circuit breaker between Line 1 and Line 2, characterized in that... The simplified automatic transfer switch consists of two single-busbar sectionalized automatic transfer switches and one single-busbar connected automatic transfer switch; When the power supply of Line 1 and Line 2 is running and the power supply of Line 3 is not running, it is the first single busbar sectionalized connection backup automatic transfer, that is, the first single busbar sectionalized connection backup automatic transfer is composed of the power supply of Line 1, the power supply of Line 2, circuit breaker QF1, circuit breaker QF2, and circuit breaker QF3. When the power supply of Line 1 and Line 3 is running and the power supply of Line 2 is not running, it is the second single busbar sectionalized connection backup automatic transfer, that is, the second single busbar sectionalized connection backup automatic transfer is composed of the power supply of Line 1, the power supply of Line 3, circuit breaker QF1, circuit breaker QF2, and circuit breaker QF4. When the power supply of Line 2 or Line 3 is in operation and circuit breaker QF2 is in cold standby, or when the power supply of Line 1 is not in operation, the power supply of Line 2 or Line 3 is in operation and circuit breaker QF2 is in operation, it is a single busbar connection for automatic transfer, that is, the power supply of Line 2, the power supply of Line 3, circuit breaker QF3, and circuit breaker QF4 form a single busbar connection for automatic transfer. The logical algebraic expression satisfied by the first single-busbar segmented connection standby automatic transfer operation mode is: ⑴ The logical algebraic expression satisfied by the second single-busbar segmented connection automatic transfer operation mode is: ⑵ The logical algebraic expression satisfied by the single busbar connection automatic transfer operation mode is: ⑶ The logical relationship between the first single-busbar segmented connection backup automatic transfer, the second single-busbar segmented connection backup automatic transfer, and the single-busbar connection backup automatic transfer is "OR". Considering the requirements of actual power grid operation, the integrated and simplified logical algebraic expression for the operation mode of the three-power supply single-busbar segmented connection backup automatic transfer is: ⑷ Where A, B, C, and D represent the closed operating states of circuit breakers QF1, QF2, QF3, and QF4, respectively, represented by 1 in Boolean algebra. , , , These represent circuit breakers QF1, QF2, QF3, and QF4 respectively in a non-closing operating state, which is represented by 0 in Boolean algebra. In the above formula, the logical algebraic expression of each field represents one operating mode of a three-power supply single bus section connection with automatic transfer backup, for a total of 9 operating modes.

2. The simplified method for three-power supply single busbar segmented wiring with automatic transfer switch as described in claim 1, characterized in that, When the power supply of Line 1 and Line 2 is running, and the power supply of Line 3 is not running, the first single busbar section automatic transfer switch shall be used first. When the power supply of Line 1 and Line 3 is running, and the power supply of Line 2 is not running, the second single busbar section automatic transfer switch shall be used first. When the power supply of Line 2 or Line 3 is running and circuit breaker QF2 is in cold standby mode, or when the power supply of Line 1 is not running, the power supply of Line 2 or Line 3 is running and circuit breaker QF2 is running, the single busbar connection automatic transfer switch shall be used first.

3. The simplified method for three-power supply single busbar segmented wiring with automatic transfer switch as described in claim 1, characterized in that, The deactivation or activation of the automatic transfer switch for a single busbar with three power supplies is achieved through remote or local activation / deactivation of the switch plate.

4. The simplified method for three-power supply single busbar segmented wiring with automatic transfer switch as described in claim 1, characterized in that, The first single busbar section automatic transfer switch, the second single busbar section automatic transfer switch, and the single busbar connection automatic transfer switch are electromagnetic automatic transfer switches or microcomputer automatic transfer switches.

5. The simplified method for three-power supply single busbar segmented wiring with automatic transfer switch as described in claim 1, characterized in that, The first single busbar segment backup automatic transfer, the second single busbar segment backup automatic transfer, and the single busbar connection backup automatic transfer logic are implemented by a PLC backup automatic transfer device integrating three backup automatic transfer logics.

6. The simplified method for three-power supply single busbar segmented wiring with automatic transfer switch as described in claim 1, characterized in that, The first single busbar section automatic transfer switch, the second single busbar section automatic transfer switch, and the single busbar connection automatic transfer switch logic are implemented by a microcomputer automatic transfer switch device integrating three automatic transfer switch logics.

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