System and method for realizing multi-mode control by building logical relationships using relays

Abstract

The present invention relates to the field of low-voltage power distribution technology, and discloses a system and method for realizing multi-mode control by using relays to build logical relationships, including a first incoming line cabinet with a circuit breaker QF1, a second incoming line cabinet with a circuit breaker QF2, and a bus coupling cabinet with a circuit breaker QF3; the incoming line end of the first incoming line cabinet is connected to the transformer 1T, and the outgoing line end of the first incoming line cabinet is connected to the I section bus; the incoming line end of the second incoming line cabinet is connected to the transformer 2T, and the outgoing line end of the second incoming line cabinet is connected to the II section bus; the first end of the bus coupling cabinet is connected to the I section bus, and the second end of the bus coupling cabinet is connected to the II section bus; by switching on and off the circuit breakers QF1, QF2, and QF3, the I section bus and the II section bus are powered. The present invention does not rely on the PLC solution, and can simultaneously realize the three modes of manual throwing, automatic throwing and automatic recovery, and automatic throwing and manual recovery.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage power distribution technology, and in particular to a system and method for realizing multi-mode control by building logical relationships using relays. Background Art

[0002] At present, the airport project lighting station and other low-voltage power distribution equipment have high electromagnetic compatibility requirements; in addition, the airport operation and maintenance and owners believe that the existing technical solutions are uncontrollable during actual operation (the owners and operation and maintenance believe that the automatic switching and PLC are unreliable through software). Therefore, the existing low-voltage power distribution two-input line plus busbar solution almost always uses automatic switching devices or PLC devices to achieve functions such as automatic switching and automatic recovery, automatic switching and manual recovery. On the one hand, the existing automatic switching solutions and PLC solutions are prone to failure in the complex electromagnetic environment of the airport. On the other hand, such equipment uses software to realize functions and is easily exploited by criminals. In particular, the lighting station equipment is related to the aircraft take-off and landing lighting guidance. Once the lighting system fails due to the failure of low-voltage equipment, the consequences will be very serious. Summary of the invention

[0003] The purpose of the present invention is to realize three modes of manual throwing, automatic throwing and automatic recovery, and automatic throwing and manual recovery simultaneously without relying on PLC scheme, and to provide a system and method for realizing multi-mode control by building logical relationships by using relays.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] A system for realizing multi-mode control by using relays to establish logical relationships comprises a first incoming line cabinet having a circuit breaker QF1, a second incoming line cabinet having a circuit breaker QF1 and a bus coupling cabinet having a circuit breaker QF3; the incoming line end of the first incoming line cabinet is connected to a transformer 1T, and the outgoing line end of the first incoming line cabinet is connected to a section I bus; the incoming line end of the second incoming line cabinet is connected to a transformer 2T, and the outgoing line end of the second incoming line cabinet is connected to a section II bus; the first end of the bus coupling cabinet is connected to a section I bus, and the second end of the bus coupling cabinet is connected to a section II bus; power is supplied to the section I bus and the section II bus by switching on and off the circuit breakers QF1, QF2 and QF3.

[0006] Compared with the prior art, the invention has the following beneficial effects: the invention uses common relays, time relays, voltage relays, etc., and builds logical relationships through secondary principle wiring to achieve functions such as self-throwing and self-recovery, and self-throwing and manual recovery. The parameters of time relays, voltage relays, etc. are all manually set by on-site operation and maintenance personnel. The entire logic control is not affected by the software system, avoiding failure of the low-voltage power distribution system due to special reasons. The operation of the entire system will not fail due to the complex electromagnetic environment of the airport, and there is no software operation, so there is no need to worry about lawbreakers using software networks to attack the lighting distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 This is a simulation diagram of the operation mode of the two-incoming-line-one-bus-tie system of the present invention;

[0009] Figure 2 This is a circuit diagram of the reset state of the first incoming line cabinet of the present invention;

[0010] Figure 3 This is a circuit diagram of the reset state of the second incoming line cabinet of the present invention;

[0011] Figure 4 This is a circuit diagram of the reset state of the mother coupling cabinet of the present invention;

[0012] Figure 5 It is a schematic diagram of the mode switching of the transfer switch SA1 and the transfer switch SA2 in the first incoming line cabinet of the present invention;

[0013] Figure 6 It is a schematic diagram of the mode switching of the transfer switch SA3 and the transfer switch SA4 in the second incoming line cabinet of the present invention;

[0014] Figure 7 It is a schematic diagram of the mode switching of the transfer switch SA5 and the transfer switch SA6 in the busbar cabinet of the present invention. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0016] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance, or implying any such actual relationship or order between these entities or operations. In addition, the terms "connected", "connected", etc. can be directly connected between elements, or indirectly connected via other elements.

[0017] The present invention is implemented by the following technical solution: a system that uses relays to build logical relationships to achieve multi-mode control, such as Figure 1 As shown, it includes a first incoming cabinet with a circuit breaker QF1, a second incoming cabinet with a circuit breaker QF2, and a bus coupling cabinet with a circuit breaker QF3. The incoming terminal of the first incoming cabinet is connected to the transformer 1T, and the outgoing terminal of the first incoming cabinet is connected to the bus section I; the incoming terminal of the second incoming cabinet is connected to the transformer 2T, and the outgoing terminal of the second incoming cabinet is connected to the bus section II; the first end of the bus coupling cabinet is connected to the bus section I, and the second end of the bus coupling cabinet is connected to the bus section II. By switching on and off the circuit breakers QF1, QF2, and QF3, power is supplied to the bus sections I and II.

[0018] When both transformer 1T and transformer 2T are energized, transformer 1T and transformer 2T operate separately, circuit breaker QF1 is closed, circuit breaker QF2 is closed, and circuit breaker QF3 is opened. Transformer 1T supplies power to bus section I, and transformer 2T supplies power to bus section II. When transformer 1T loses power and transformer 2T is energized, circuit breaker QF1 is opened, circuit breaker QF2 is closed, and circuit breaker QF3 is closed. Transformer 2T supplies power to bus section I and bus section II. When transformer 1T resumes power supply: in the automatic transfer and automatic recovery mode, circuit breaker QF3 is opened, circuit breaker QF2 is closed, and circuit breaker QF3 is closed. Transformer 2T supplies power to bus section I and bus section II. F1 is closed and the operation mode is restored to the split-column mode. In the automatic throw-in and manual restoration mode, the on-site operation and maintenance personnel shall determine whether the split-column operation mode is restored. When transformer 1T is energized and transformer 2T is de-energized, circuit breaker QF1 is closed, circuit breaker QF2 is opened, and circuit breaker QF3 is closed. Transformer 1T supplies power to bus sections I and bus sections II. When transformer 2T resumes power supply: in the automatic throw-in and automatic restoration mode, circuit breaker QF3 is opened, circuit breaker QF2 is closed, and the operation mode is restored to the split-column mode. In the automatic throw-in and manual restoration mode, the on-site operation and maintenance personnel shall determine whether the split-column operation mode is restored.

[0019] See also Figure 2The first incoming line cabinet includes: fuse FU15, fuse FU16, circuit breaker QF1, transfer switch SA1, transfer switch SA2, symmetrical on-off delay relay KT11 (corresponding to normally open contact KT11.1, normally open contact KT11.2), power-on delay relay KT12 (corresponding to Figure 4Normally open contact KT12), power-off delay relay KT13 (corresponding to normally closed contact KT13), normally open contact KA33.1, normally closed contact KA33.2, voltage relay JVR, undervoltage release delay relay KT6, undervoltage release electrical resetter QF1.KT, push button switch SC, push button switch SO, auxiliary switch QF1.S, normally closed auxiliary contact QF1.OF, normally closed auxiliary contact QF2.OF, normally closed auxiliary contact QF3.OF. Connection relationship: Transformer 1T is connected to the incoming terminal of the first incoming cabinet, and the reliable control power supply is connected to the processor power supply terminal K1 of the circuit breaker QF1, the energy storage motor terminal U1 of the circuit breaker QF1, the pin 1 of the transfer switch SA1, the pin 3 of the transfer switch SA1, the pin 5 of the transfer switch SA1, the pin 7 of the transfer switch SA2, the first terminal of the normally closed auxiliary contact QF1.OF, and the first control terminal of the symmetrical on-off delay relay KT11 through the fuse FU15; Pin 4 of the transfer switch SA1 is respectively connected to the first terminal of the normally open contact KA33.1 and the first terminal of the normally closed contact KA33.2. A terminal is connected, pin 2 of the transfer switch SA1 is respectively connected to the second terminal of the normally open contact KA33.1, the first terminal of the push button switch SC, and the first terminal of the push button switch SO; pin 6 of the transfer switch SA1 is respectively connected to the second terminal of the normally closed contact KA33.2, the first terminal of the normally open contact KT11.1, and the first terminal of the normally open contact KT11.2; the second terminal of the push button switch SC is respectively connected to the second terminal of the normally open contact KT11.1, the first terminal of the normally closed auxiliary contact QF2.OF, and the first terminal of the normally closed auxiliary contact QF3.OF; The second terminal of the normally open contact KT11.2 is connected to the first terminal of the normally closed contact KT13, and the second terminal of the normally closed contact KT13 and the second terminal of the push button switch SO are respectively connected to the opening terminal B1 of the circuit breaker QF1; the second terminal of the normally closed auxiliary contact QF2.OF and the second terminal of the normally closed auxiliary contact QF3.OF are respectively connected to the closing terminal C1 of the circuit breaker QF1; the second terminal of the normally closed auxiliary contact QF1.OF is connected to the reset terminal R1 of the undervoltage release electrical resetter QF1.KT; the pin 8 of the conversion switch SA2 is connected to the pin 11 of the voltage relay JVR, Pin 12 of voltage relay JVR is respectively connected to the second control terminal of symmetrical on-off delay relay KT11, the first control terminal of on-delay relay KT12, and the first control terminal of off-delay relay KT13; the incoming terminal of the first incoming cabinet is connected to pin 13 of undervoltage tripping delay relay KT6 through fuse FU16, pin 15 of undervoltage tripping delay relay KT6 is connected to undervoltage tripping terminal D1 of circuit breaker QF1, and pin 16 of undervoltage tripping delay relay KT6 is connected to undervoltage tripping terminal D2 of circuit breaker QF1; the closing terminal C2 of circuit breaker QF1 is connected to auxiliary switch QF1.S's pin 25, the opening terminal B2 of the circuit breaker QF1 is connected to the pin 26 of the auxiliary switch QF1.S; the pin 14 of the undervoltage tripping delay relay KT6, the processor power supply terminal K2 of the circuit breaker QF1, the energy storage motor terminal U2 of the circuit breaker QF1, the pin 27 of the auxiliary switch QF1.S, the reset terminal R2 of the undervoltage tripping electrical resetter QF1.KT, the third control terminal of the symmetrical power-on and power-off delay relay KT11, the second control terminal of the power-on delay relay KT12, and the second control terminal of the power-off delay relay KT13 are all connected to the reliable control power supply neutral line of the first incoming cabinet. A coil I1 is connected between the undervoltage tripping terminal D1 and the undervoltage tripping terminal D2 of the circuit breaker QF1, a coil I2 is connected between the closing terminal C1 and the closing terminal C2, a coil I3 is connected between the opening terminal B1 and the opening terminal B2, and a coil I4 is connected between the reset terminal R1 and the reset terminal R2 of the undervoltage tripping electrical resetter QF1.KT.

[0020] See also Figure 5 , when the hand-throwing mode is required, the conversion switch SA1 and the conversion switch SA2 are simultaneously moved to the first column, so that pins 1 and 2 of the conversion switch SA1 are connected, pins 3 and 4 are not connected, pins 5 and 6 are not connected, and pins 7 and 8 of the conversion switch SA2 are not connected. The black dot in the conversion switch SA1 indicates that the pins at this location are connected when it is moved to this column. Similarly, when the automatic throwing and automatic recovery mode is required, the conversion switch SA1 and the conversion switch SA2 are simultaneously moved to the second column, so that pins 1 and 2 of the conversion switch SA1 are not connected, pins 3 and 4 are not connected, pins 5 and 6 are connected, and pins 7 and 8 of the conversion switch SA1 are connected. When the automatic throwing and hand-throwing mode is required, the conversion switch SA1 and the conversion switch SA2 are simultaneously moved to the third column, so that pins 1 and 2 of the conversion switch SA1 are not connected, pins 3 and 4 are connected, pins 5 and 6 are not connected, and pins 7 and 8 of the conversion switch SA1 are connected.

[0021] See also Figure 3 The second incoming line cabinet includes: fuse FU25, fuse FU26, circuit breaker QF2, transfer switch SA3, transfer switch SA4, symmetrical on-off delay relay KT21 (corresponding to normally open contact KT21.1, normally open contact KT21.2), power-on delay relay KT22 (corresponding to Figure 4Normally open contact KT22), power-off delay relay KT23 (corresponding to normally closed contact KT23), normally open contact KA33.1, normally closed contact KA33.2, voltage relay JVR, undervoltage release delay relay KT6, undervoltage release electrical resetter QF2.KT, push button switch SC, push button switch SO, auxiliary switch QF2.S, normally closed auxiliary contact QF1.OF, normally closed auxiliary contact QF2.OF, normally closed auxiliary contact QF3.OF. Connection relationship: Transformer 2T is connected to the incoming terminal of the second incoming cabinet, and the reliable control power supply is connected to the processor power supply terminal K1 of the circuit breaker QF2, the energy storage motor terminal U1 of the circuit breaker QF2, the pin 32 of the transfer switch SA3, the pin 34 of the transfer switch SA3, the pin 36 of the transfer switch SA3, the pin 38 of the transfer switch SA4, the first terminal of the normally closed auxiliary contact QF2.OF, and the first control terminal of the symmetrical on-off delay relay KT21 through the fuse FU25; the pin 35 of the transfer switch SA3 is respectively connected to the first terminal of the normally open contact KA33.1 and the normally closed contact KA33. 2, the pin 33 of the transfer switch SA3 is respectively connected to the second terminal of the normally open contact KA33.1, the first terminal of the push button switch SC, and the first terminal of the push button switch SO; the pin 37 of the transfer switch SA3 is respectively connected to the second terminal of the normally closed contact KA33.2, the first terminal of the normally open contact KT21.1, and the first terminal of the normally open contact KT21.2; the second terminal of the push button switch SC is respectively connected to the second terminal of the normally open contact KT21.1, the first terminal of the normally closed auxiliary contact QF1.OF, and the first terminal of the normally closed auxiliary contact QF3.OF The second terminal of the normally open contact KT21.2 is connected to the first terminal of the normally closed contact KT23, and the second terminal of the normally closed contact KT23 and the second terminal of the push button switch SO are respectively connected to the opening terminal B1 of the circuit breaker QF2; the second terminal of the normally closed auxiliary contact QF1.OF and the second terminal of the normally closed auxiliary contact QF3.OF are respectively connected to the closing terminal C1 of the circuit breaker QF2; the second terminal of the normally closed auxiliary contact QF2.OF is connected to the reset terminal R1 of the undervoltage release electrical resetter QF2.KT; the pin 39 of the conversion switch SA4 is connected to the pin 42 of the voltage relay JVR The 43rd pin of the voltage relay JVR is respectively connected to the second control terminal of the symmetrical on-off delay relay KT21, the first control terminal of the on-delay relay KT22, and the first control terminal of the off-delay relay KT23; the incoming terminal of the first incoming cabinet is connected to the pin 44 of the undervoltage tripping delay relay KT6 through the fuse FU26, the pin 46 of the undervoltage tripping delay relay KT6 is connected to the undervoltage tripping terminal D1 of the circuit breaker QF2, and the pin 47 of the undervoltage tripping delay relay KT6 is connected to the undervoltage tripping terminal D2 of the circuit breaker QF2; the closing terminal C2 of the circuit breaker QF2 is connected to the auxiliary switch QF2.S's pin 56, the opening terminal B2 of the circuit breaker QF2 is connected to the pin 57 of the auxiliary switch QF1.S; the pin 45 of the undervoltage tripping delay relay KT6, the processor power supply terminal K2 of the circuit breaker QF2, the energy storage motor terminal U2 of the circuit breaker QF2, the pin 58 of the auxiliary switch QF2.S, the reset terminal R2 of the undervoltage tripping electrical resetter QF2.KT, the third control terminal of the symmetrical power-on and power-off delay relay KT21, the second control terminal of the power-on delay relay KT22, and the second control terminal of the power-off delay relay KT23 are all connected to the reliable control power supply neutral line of the second incoming cabinet. A coil I1 is connected between the undervoltage tripping terminal D1 and the undervoltage tripping terminal D2 of the circuit breaker QF2, a coil I2 is connected between the closing terminal C1 and the closing terminal C2, a coil I3 is connected between the opening terminal B1 and the opening terminal B2, and a coil I4 is connected between the reset terminal R1 and the reset terminal R2 of the undervoltage tripping electrical resetter QF2.KT.

[0022] See also Figure 6 , when the hand-throwing mode is required, the conversion switch SA3 and the conversion switch SA4 are simultaneously moved to the first column, so that the pin 32 and the pin 33 of the conversion switch SA3 are connected, the pin 34 and the pin 35 are not connected, the pin 36 and the pin 37 are not connected, and the pin 38 and the pin 39 of the conversion switch SA4 are not connected. Similarly, when the automatic throwing and automatic recovery mode is required, the conversion switch SA3 and the conversion switch SA4 are simultaneously moved to the second column, so that the pin 32 and the pin 33 of the conversion switch SA3 are not connected, the pin 34 and the pin 35 are not connected, the pin 36 and the pin 37 are connected, and the pin 38 and the pin 39 of the conversion switch SA4 are connected. When the self-throwing and hand-throwing mode is required, the conversion switch SA3 and the conversion switch SA4 are simultaneously moved to the third column, so that the pin 32 and the pin 33 of the conversion switch SA3 are not connected, the pin 34 and the pin 35 are connected, the pin 36 and the pin 37 are not connected, and the pin 38 and the pin 39 of the conversion switch SA4 are connected.

[0023] See also Figure 4 The busbar cabinet includes: fuse FU35, circuit breaker QF3, transfer switch SA5, transfer switch SA6, intermediate relay KA33 (corresponding to normally open contact KA33, and Figure 2 and Figure 3Normally open contact KA33.1, normally closed contact KA33.2), normally open contact KT12, normally open contact KT22, intermediate relay KA34 (corresponding to normally open contact KA34.1, normally closed contact KA34.2), push button switch SC, push button switch SO, push button switch SB, auxiliary switch QF3.S, normally closed auxiliary contact QF1.OF, normally closed auxiliary contact QF2.OF, normally closed auxiliary contact QF1.OF1, normally closed auxiliary contact QF1.OF2, normally closed auxiliary contact QF2.OF1, normally closed auxiliary contact QF2.OF2.Connection relationship: Section I busbar is connected to the first incoming line terminal of the bus coupling cabinet, and the reliable control power supply is connected to the processor power supply terminal K1 of the circuit breaker QF3, the energy storage motor terminal U1 of the circuit breaker QF3, the 63rd pin of the transfer switch SA5, the 65th pin of the transfer switch SA5, the 67th pin of the transfer switch SA5, and the 69th pin of the transfer switch SA6 through the fuse FU35; the 66th pin of the transfer switch SA5 is respectively connected to the first terminal of the normally open contact KA34.1, the first terminal of the normally closed auxiliary contact QF1.OF1, and the first terminal of the normally closed auxiliary contact QF2.OF1; the 64th pin of the transfer switch SA5 is respectively connected to the second terminal of the normally open contact KA34.1, the push button switch S The first terminal of C is connected to the first terminal of the push button switch SO; the 68 pin of the conversion switch SA5 is respectively connected to the first terminal of the normally closed contact KA34.2 and the first terminal of the normally open contact KT12, and the second terminal of the normally open contact KT12 is connected to the first terminal of the normally open contact KT22; the second terminal of the normally closed contact KA34.2 is respectively connected to the first terminal of the normally closed auxiliary contact QF1.OF2 and the first terminal of the normally closed auxiliary contact QF2.OF2; the second terminal of the push button switch SC is respectively connected to the second terminal of the normally closed auxiliary contact QF1.OF1, the second terminal of the normally closed auxiliary contact QF2.OF1, and the second terminal of the normally closed auxiliary contact QF1.OF2. The second terminal of the normally closed auxiliary contact QF1.OF and the second terminal of the normally closed auxiliary contact QF2.OF are connected to the closing terminal C1 of the circuit breaker QF3; the second terminal of the push button switch SO and the second terminal of the normally open contact KT22 are connected to the opening terminal B1 of the circuit breaker QF3; the pin 70 of the transfer switch SA6 is connected to the first terminal of the push button switch SB and the first control terminal of the intermediate relay KA34, and the second terminal of the push button switch SB is connected to the first terminal of the push button switch SO. The first terminal of the normally open contact KA33 is connected to the second terminal of the push button switch SO and the second terminal of the normally open contact KA33 are respectively connected to the first control terminal of the intermediate relay KA33; the closing terminal C2 of the circuit breaker QF3 is connected to the pin 77 of the auxiliary switch QF3.S, and the opening terminal B2 of the circuit breaker QF3 is connected to the pin 78 of the auxiliary switch QF3.S; the processor power supply terminal K2 of the circuit breaker QF3, the energy storage motor terminal U2 of the circuit breaker QF3, the pin 79 of the auxiliary switch QF3.S, the second control terminal of the intermediate relay KA33, and the second control terminal of the intermediate relay KA34 are all connected to the reliable control power supply neutral line of the bus coupler, and the outlet terminal of the bus coupler is connected to the bus section II. A coil I1 is connected between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3, and a coil I2 is connected between the opening terminal B1 and the opening terminal B2.

[0024] See also Figure 7 , when the hand-throwing mode is required, the conversion switch SA5 and the conversion switch SA6 are simultaneously moved to the first column, so that the pin 63 and the pin 64 of the conversion switch SA5 are connected, the pin 65 and the pin 66 are not connected, the pin 67 and the pin 68 are not connected, and the pin 69 and the pin 70 of the conversion switch SA6 are not connected. Similarly, when the automatic throwing and automatic recovery mode is required, the conversion switch SA5 and the conversion switch SA6 are simultaneously moved to the second column, so that the pin 63 and the pin 64 of the conversion switch SA5 are not connected, the pin 65 and the pin 66 are not connected, the pin 67 and the pin 68 are connected, and the pin 69 and the pin 70 of the conversion switch SA6 are not connected. When the self-throwing and hand-throwing mode is required, the conversion switch SA5 and the conversion switch SA6 are simultaneously moved to the third column, so that the pin 63 and the pin 64 of the conversion switch SA5 are not connected, the pin 65 and the pin 66 are connected, the pin 67 and the pin 68 are not connected, and the pin 69 and the pin 70 of the conversion switch SA6 are connected.

[0025] Based on the above system, this solution proposes a method of using relays to build logical relationships to achieve multi-mode control. The multi-mode is reflected in the ability to achieve manual throwing, automatic throwing and automatic recovery, and automatic throwing and manual recovery. This embodiment will describe these three modes separately.

[0026] (I) The hand-casting mode control method includes the following steps:

[0027] Step 1: Transformer 1T and transformer 2T are both energized, and circuit breaker QF1 is controlled to be closed, circuit breaker QF2 is controlled to be closed, and circuit breaker QF3 is controlled to be opened, so that transformer 1T is powered by bus section I, and transformer 2T is powered by bus section II.

[0028] For a specific implementation, see Figure 2 and Figure 5, turn the transfer switch SA1 and the transfer switch SA2 to the first column at the same time, only the pin 1 and pin 2 of the transfer switch SA1 are connected, line 103 is valid, and lines 109, 111, and 119 are invalid. Manually press the button switch SC, line 105 is valid, the normally closed auxiliary contact QF2.OF and the normally closed auxiliary contact QF3.OF remain closed, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is activated, the coil I2 is energized, and the pin 25 and pin 27 of the auxiliary switch QF1.S are connected, Circuit breaker QF1 is closed; at the moment when circuit breaker QF1 is closed, pins 25 and 27 of auxiliary switch QF1.S are disconnected, circuit breaker QF1 remains closed, normally closed auxiliary contact QF1.OF is disconnected, and line 117 fails; since pins 7 and 8 of transfer switch SA2 are not connected, voltage relay JVR is disconnected, line 121 fails, symmetrical on-off delay relay KT11, power-on delay relay KT12, and power-off delay relay KT13 all have no action, and at this time, circuit breaker QF1 is switched on and off.

[0029] See also Figure 3 and Figure 6 , turn the transfer switch SA3 and the transfer switch SA4 to the first column at the same time, only the pin 32 and pin 33 of the transfer switch SA3 are connected, line 203 is valid, and lines 209, 211, and 219 are invalid. Press the button switch SC manually, line 205 is valid, because the circuit breaker QF1 has been closed, the normally closed auxiliary contact QF1.OF is disconnected, the normally closed auxiliary contact QF3.OF remains closed, and line 207 is valid (regardless of whether the circuit breaker QF1 is closed in advance, because the circuit breaker QF3 is open, the normally closed auxiliary contact QF3.OF is always closed, then line 207 is valid), the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 are closed. Coil I2 between terminals C2 is actuated, coil I2 is energized, pin 56 and pin 58 of auxiliary switch QF2.S are connected, and circuit breaker QF2 is closed; at the moment circuit breaker QF2 is closed, pin 56 and pin 58 of auxiliary switch QF2.S are disconnected, circuit breaker QF2 remains closed, normally closed auxiliary contact QF2.OF is disconnected, and line 217 fails; since pin 38 and pin 39 of transfer switch SA4 are not connected, voltage relay JVR is disconnected, line 221 fails, symmetrical on-off delay relay KT21, power-on delay relay KT22, and power-off delay relay KT23 are all inactive, and at this time, circuit breaker QF2 is switched on and off.

[0030] See also Figure 4 and Figure 7, switch SA5 and switch SA6 are simultaneously switched to the first column, only pin 63 and pin 64 of switch SA5 are connected, line 303 is valid, line 309, line 313, line 319 are invalid, because transformer 1T and transformer 2T are energized and normal at this time, there is no need to switch on circuit breaker QF3, at this time Figure 4 All devices in the system do not take any action and remain in reset state.

[0031] At this point, transformer 1T supplies power to bus section I through the closed circuit breaker QF1, and transformer 2T supplies power to bus section II through the closed circuit breaker QF2.

[0032] Step 2: Transformer 1T loses power, circuit breaker QF1 opens, and circuit breaker QF3 is controlled to close, so that the energized transformer 2T supplies power to section II bus, and transformer 2T then supplies power to section I bus through the closed circuit breaker QF3.

[0033] For more details, please see Figure 2 After the transformer 1T loses power, first the pins 13 and 14 of the undervoltage trip delay relay KT6 receive the power-off signal, and the pins 15 and 16 are disconnected, causing the coil I1 between the undervoltage trip terminal D1 and the undervoltage trip terminal D2 of the circuit breaker QF1 to lose power, and the circuit breaker QF1 trips and disconnects, and the entire first incoming line cabinet fails. Figure 2 Each device in the system is restored to its reset state.

[0034] Please continue to see Figure 3 , since transformer 2T is still energized normally, Figure 3 All devices in the circuit breaker QF2 remain in the state after closing.

[0035] Please continue to see Figure 4 Since transformer 1T loses power, circuit breaker QF3 needs to be closed. At this time, the button switch SC is manually pressed, and lines 303 and 305 are valid. Since circuit breaker QF1 has tripped and disconnected, the normally closed auxiliary contact QF1.OF is closed, and circuit breaker QF2 is in a normal closed state. The normally closed auxiliary contact QF2.OF is in an open state, and line 307 is valid. The coil I1 between the closing terminal C1 and the closing terminal C2 of circuit breaker QF3 is actuated, and the coil I1 is energized. Pins 77 and 79 of the auxiliary switch QF3.S are connected, and circuit breaker QF3 is closed; at the moment when circuit breaker QF3 is closed, pins 77 and 79 of the auxiliary switch QF3.S are disconnected, and circuit breaker QF3 remains closed.

[0036] In manual operation mode, when transformer 1T is restored, the on-site operation and maintenance personnel will determine whether to restore the split operation mode. If restoration is required, the on-site operation and maintenance personnel will first open the circuit breaker QF3, and then close the incoming line switch corresponding to the restored transformer 1T.

[0037] When the undervoltage release electrical resetter QF1.KT is energized, it is used to reset the coil I1 between the undervoltage release terminal D1 and the undervoltage release terminal D2 of the circuit breaker QF1. Because once the coil I1 between the undervoltage release terminal D1 and the undervoltage release terminal D2 of the circuit breaker QF1 is actuated, if it is not reset, the circuit breaker QF1 cannot perform the next opening and closing operation.

[0038] Step 3: Transformer 2T loses power, circuit breaker QF2 opens, and circuit breaker QF3 is controlled to close, so that the energized transformer 1T supplies power to section I bus, and transformer 1T then supplies power to section II bus through the closed circuit breaker QF3.

[0039] It should be noted that the above step 2 is followed by step 1, and step 3 is also followed by step 1, but there is no logical relationship between step 2 and step 3.

[0040] For more details, see Figure 2 , since transformer 1T is still energized normally, Figure 2 All devices in the circuit breaker QF1 remain in the state after closing.

[0041] See also Figure 3 After the transformer 2T loses power, pins 44 and 45 of the undervoltage trip delay relay KT6 receive the power-off signal, and pins 46 and 47 are disconnected, causing the coil I1 between the undervoltage trip terminal D1 and the undervoltage trip terminal D2 of the circuit breaker QF2 to lose power, and the circuit breaker QF2 trips and disconnects, and the entire second incoming line cabinet fails.

[0042] Please continue to see Figure 4 Since transformer 2T loses power, circuit breaker QF3 needs to be closed. At this time, the button switch SC is manually pressed, and lines 303 and 305 are valid. Since circuit breaker QF2 has tripped and disconnected, the normally closed auxiliary contact QF2.OF is closed, circuit breaker QF1 is in a normal closed state, the normally closed auxiliary contact QF1.OF is in an open state, line 307 is valid, and coil I1 between closing terminals C1 and C2 of circuit breaker QF3 is actuated, coil I1 is energized, pin 77 and pin 79 of auxiliary switch QF3.S are connected, and circuit breaker QF3 is closed; at the moment circuit breaker QF3 is closed, pin 77 and pin 79 of auxiliary switch QF3.S are disconnected, and circuit breaker QF3 remains closed.

[0043] In the manual operation mode, when transformer 2T is restored, the on-site operation and maintenance personnel will determine whether to restore the split operation mode. If restoration is required, the on-site operation and maintenance personnel will first open the circuit breaker QF3, and then close the incoming line switch corresponding to the restored transformer 2T.

[0044] (II) The automatic transfer and automatic recovery mode control method includes the following steps:

[0045] Step 1: Transformer 1T and transformer 2T are both energized, and circuit breaker QF1 is controlled to be closed, circuit breaker QF2 is controlled to be closed, and circuit breaker QF3 is controlled to be opened, so that transformer 1T is powered by bus section I, and transformer 2T is powered by bus section II.

[0046] For a specific implementation, see Figure 2 and Figure 5 , turn the transfer switch SA1 and the transfer switch SA2 to the second column at the same time, only pin 5 and pin 6 of the transfer switch SA1 are connected, pin 7 and pin 8 of the transfer switch SA2 are connected, line 111 and line 119 are valid, line 103 and line 109 are invalid, after the voltage relay JVR detects the normal voltage, the voltage relay JVR is closed, line 121 is valid, the power-off delay relay KT13 is actuated, and the corresponding normally closed contact KT13 is disconnected at the 0th second, line 115 is invalid, the symmetrical on-off delay relay KT11 is actuated, and the corresponding normally open contact KT11.1 is closed at the 15th second, and the normally open contact KT11.2 is closed at the 15th second, line 105 is valid, the normally closed auxiliary contact QF2.OF is closed, the normally closed auxiliary contact QF3.OF is closed, line 107 is valid, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is actuated, the coil I2 is energized, the pin 25 and the pin 27 of the auxiliary switch QF1.S are connected, and the circuit breaker QF1 is closed; at the moment when the circuit breaker QF1 is closed, the pin 25 and the pin 27 of the auxiliary switch QF1.S are disconnected, the circuit breaker QF1 remains closed, the normally closed auxiliary contact QF1.OF is disconnected, and the line 117 fails. At this time, the circuit breaker QF1 is switched on and off.

[0047] See also Figure 3 and Figure 6, switch SA3 and switch SA4 are simultaneously moved to the second column, only pin 36 and pin 37 of switch SA3 are connected, pin 38 and pin 39 of switch SA4 are connected, line 211 and line 219 are valid, line 203 and line 209 are invalid, after voltage relay JVR detects normal voltage, voltage relay JVR closes, line 221 is valid, power-off delay relay KT23 operates, the corresponding normally closed contact KT23 is disconnected at 0s, line 215 is invalid, symmetrical power-on and power-off delay relay KT21 operates, the corresponding normally open contact KT21.1 is closed at 15s, normally open contact KT21.2 is closed at 15s, line 205 is valid, since circuit breaker QF1 is closed , so the normally closed auxiliary contact QF1.OF is disconnected, the normally closed auxiliary contact QF3.OF is closed, and line 207 is valid (regardless of whether the circuit breaker QF1 is closed in advance, because the circuit breaker QF3 is open, the normally closed auxiliary contact QF3.OF is always closed, then line 207 is valid), the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, the coil I2 is energized, the pin 56 and the pin 58 of the auxiliary switch QF2.S are connected, and the circuit breaker QF2 is closed; at the moment when the circuit breaker QF2 is closed, the pin 56 and the pin 58 of the auxiliary switch QF2.S are disconnected, the circuit breaker QF2 remains closed, the normally closed auxiliary contact QF2.OF is disconnected, and the line 217 fails. At this time, the circuit breaker QF2 is switched on and off.

[0048] See also Figure 4 and Figure 7 , the transfer switches SA5 and SA6 are simultaneously moved to the second column, only the pins 67 and 68 of the transfer switch SA5 are connected, the line 313 is valid, the lines 303, 309, and 319 are invalid. Since the circuit breakers QF1 and QF2 have been switched at this time, the normally closed auxiliary contacts QF1.OF2, QF2.OF2, QF1.OF, and QF2.OF are all disconnected, the lines 311, 305, and 307 are invalid, the circuit breaker QF3 is opened, and the pins 78 and 79 of the auxiliary switch QF3.S are disconnected. Figure 2 The power-on delay relay KT12 and Figure 3 The power-on delay relay KT22 in the Figure 4 The normally open contact KT12 and the normally open contact KT22 are closed, but the lines 317 and 327 are still ineffective, so the circuit breaker QF3 is not switched on at this time.

[0049] At this point, transformer 1T supplies power to bus section I through the closed circuit breaker QF1, and transformer 2T supplies power to bus section II through the closed circuit breaker QF2.

[0050] Step 2: Transformer 1T loses power, circuit breaker QF1 opens, and circuit breaker QF3 is controlled to close, so that the energized transformer 2T supplies power to section II bus, and transformer 2T then supplies power to section I bus through the closed circuit breaker QF3.

[0051] For more details, please see Figure 2 After the transformer 1T loses power, pins 13 and 14 of the undervoltage trip delay relay KT6 receive the power-off signal, and pins 15 and 16 are disconnected, causing the coil I1 between the undervoltage trip terminal D1 and the undervoltage trip terminal D2 of the circuit breaker QF1 to lose power, and the circuit breaker QF1 trips and disconnects, and the entire first incoming line cabinet fails.

[0052] Please continue to see Figure 3 , since transformer 2T is still energized normally, Figure 3 All devices in the circuit breaker QF2 remain in the state after closing.

[0053] Please continue to see Figure 4 Since transformer 1T loses power, circuit breaker QF3 needs to be closed. At this time, pin 67 and pin 68 of transfer switch SA5 are connected, and line 313 is valid. Since circuit breaker QF1 has been opened, normally closed auxiliary contact QF1.OF2 is closed and normally closed auxiliary contact QF1.OF is closed. Because pin 69 and pin 70 of transfer switch SA6 are not connected, line 319 is invalid. Therefore, normally closed contact KA34.2 of intermediate relay KA34 does not act. Line 311, line 305, and line 307 are valid. Coil I1 between closing terminal C1 and closing terminal C2 of circuit breaker QF3 acts, coil I1 is energized, pin 77 and pin 79 of auxiliary switch QF3.S are connected, and circuit breaker QF3 is closed. At the moment when circuit breaker QF3 is closed, pin 77 and pin 79 of auxiliary switch QF3.S are disconnected, and circuit breaker QF3 remains closed.

[0054] In the automatic transfer and automatic recovery mode, when the transformer 1T is restored, Figure 2 When the medium voltage relay JVR detects that the voltage is normal, the voltage relay JVR closes, lines 119 and 121 are valid, the power-off delay relay KT13 operates, and the corresponding normally closed contact KT13 is disconnected at the 0th second. Lines 113 and 115 fail, and the symmetrical on-off delay relay KT11 operates. The corresponding normally open contact KT11.1 is closed at the 15th second, and the normally open contact KT11.2 is closed at the 15th second. The power-on delay relay KT12 operates. Figure 4 The corresponding normally open contact KT12 closes at the 10th second. Figure 2 The middle line 111 and line 105 are effective; Figure 4The normally open contact KT12 is closed, the normally open contact KT22 is closed, the lines 313, 315 and 317 are effective, the coil I2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, the coil I2 is energized, the pins 78 and 79 of the auxiliary switch QF3.S are connected, and the circuit breaker QF3 is opened; at the moment when the circuit breaker QF3 is opened, the pins 78 and 79 of the auxiliary switch QF3.S are disconnected, and the circuit breaker QF3 remains opened; because the circuit breaker QF3 is opened, Figure 2 The normally closed auxiliary contact QF3.OF in the middle is closed, lines 111, 105 and 107 are effective, coil I2 between closing terminals C1 and C2 of circuit breaker QF1 is actuated, coil I2 is energized, and QF1 is closed and switched. At this point, transformer 1T is restored to supply power to bus section I, and transformer 2T is restored to supply power to bus section II.

[0055] Step 3: Transformer 2T loses power, circuit breaker QF2 opens, and circuit breaker QF3 is controlled to close, so that the energized transformer 1T supplies power to section I bus, and transformer 1T then supplies power to section II bus through the closed circuit breaker QF3.

[0056] It should be noted that the above step 2 is followed by step 1, and step 3 is also followed by step 1, but there is no logical relationship between step 2 and step 3.

[0057] For more details, see Figure 2 , since transformer 1T is still energized normally, Figure 2 All devices in the circuit breaker QF1 remain in the state after closing.

[0058] See also Figure 3 After the transformer 2T loses power, pins 44 and 45 of the undervoltage trip delay relay KT6 receive the power-off signal, and pins 46 and 47 are disconnected, causing the coil I1 between the undervoltage trip terminal D1 and the undervoltage trip terminal D2 of the circuit breaker QF2 to lose power, and the circuit breaker QF2 trips and disconnects, and the entire second incoming line cabinet fails.

[0059] Please continue to see Figure 4Since transformer 2T loses power, circuit breaker QF3 needs to be closed. At this time, pin 67 and pin 68 of transfer switch SA5 are connected, and line 313 is valid. Since circuit breaker QF2 has been opened, the normally closed auxiliary contact QF2.OF2 is closed and the normally closed auxiliary contact QF2.OF is closed. Because pin 69 and pin 70 of SA6 are not connected, line 319 is invalid, so the normally closed contact KA34.2 of intermediate relay KA34 does not act, and lines 311, 305, and 307 are valid. Coil I1 between closing terminal C1 and closing terminal C2 of circuit breaker QF3 acts, coil I1 is energized, pin 77 and pin 79 of auxiliary switch QF3.S are connected, and circuit breaker QF3 is closed; at the moment when circuit breaker QF3 is closed, pin 77 and pin 79 of auxiliary switch QF3.S are disconnected, and circuit breaker QF3 remains closed.

[0060] In the automatic transfer and automatic recovery mode, when the transformer 2T is restored, Figure 3 When the medium voltage relay JVR detects that the voltage is normal, the voltage relay JVR closes, lines 219 and 221 are valid, the power-off delay relay KT23 operates, and the corresponding normally closed contact KT23 is disconnected at the 0th second. Lines 213 and 215 fail, and the symmetrical on-off delay relay KT21 operates. The corresponding normally open contact KT21.1 is closed at the 15th second, and the normally open contact KT21.2 is closed at the 15th second. The power-on delay relay KT22 operates. Figure 4 The corresponding normally open contact KT22 closes at the 10th second. Figure 3 The middle line 211 and line 205 are effective; Figure 4 The normally open contact KT12 is closed, the normally open contact KT22 is closed, the lines 313, 315 and 317 are effective, the coil I2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, the coil I2 is energized, the pins 78 and 79 of the auxiliary switch QF3.S are connected, and the circuit breaker QF3 is opened; at the moment when the circuit breaker QF3 is opened, the pins 78 and 79 of the auxiliary switch QF3.S are disconnected, and the circuit breaker QF3 remains opened; because the circuit breaker QF3 is opened, Figure 3 The normally closed auxiliary contact QF3.OF in the middle is closed, lines 211, 205 and 207 are effective, coil I2 between closing terminals C1 and C2 of circuit breaker QF2 is actuated, coil I2 is energized, and QF2 is closed and switched. At this point, transformer 1T is restored to supply power to bus section I, and transformer 2T is restored to supply power to bus section II.

[0061] (III) The self-pitching mode control method includes the following steps:

[0062] Step 1: Transformer 1T and transformer 2T are both energized, and circuit breaker QF1 is controlled to be closed, circuit breaker QF2 is controlled to be closed, and circuit breaker QF3 is controlled to be opened, so that transformer 1T is powered by bus section I, and transformer 2T is powered by bus section II.

[0063] For a specific implementation, see Figure 2 and Figure 5 , turn the transfer switch SA1 and the transfer switch SA2 to the third column at the same time, only pin 3 and pin 4 of the transfer switch SA1 are connected, pin 7 and pin 8 of the transfer switch SA2 are connected, line 109 and line 119 are valid, line 103 and line 111 are invalid, after the voltage relay JVR detects the normal voltage, the voltage relay JVR is closed, line 121 is valid, the power-off delay relay KT13 is actuated, and the corresponding normally closed contact KT13 is disconnected at the 0th second, the symmetrical on-off delay relay KT11 is actuated, and the corresponding normally open contact KT11.1 is closed at the 15th second, and the normally open contact KT11.2 is closed at the 15th second. It is closed at 15s, line 105 is valid, line 115 is invalid, the normally closed auxiliary contact QF2.OF is closed, the normally closed auxiliary contact QF3.OF is closed, line 107 is valid, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is actuated, the coil I2 is energized, the pin 25 and the pin 27 of the auxiliary switch QF1.S are connected, and the circuit breaker QF1 is closed; at the moment when the circuit breaker QF1 is closed, the pin 25 and the pin 27 of the auxiliary switch QF1.S are disconnected, the circuit breaker QF1 remains closed, the normally closed auxiliary contact QF1.OF is disconnected, and the line 117 is invalid. At this time, the circuit breaker QF1 is switched on and off.

[0064] See also Figure 3 and Figure 6, switch SA3 and switch SA4 are simultaneously moved to the third column, only pin 34 and pin 35 of switch SA3 are connected, pin 38 and pin 39 of switch SA4 are connected, line 209 and line 219 are valid, line 203 and line 211 are invalid, after voltage relay JVR detects normal voltage, voltage relay JVR is closed, line 221 is valid, power-off delay relay KT23 is actuated, and the corresponding normally closed contact KT23 is disconnected at 0s, symmetrical on-off delay relay KT21 is actuated, and the corresponding normally open contact KT21.1 is closed at 15s, and the normally open contact KT21.2 is closed at 15s. Closed, line 205 is valid, line 215 is invalid. Since the circuit breaker QF1 is closed, the normally closed auxiliary contact QF1.OF is disconnected, the normally closed auxiliary contact QF3.OF is closed, and line 207 is valid. The coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, the coil I2 is energized, the pin 56 and the pin 58 of the auxiliary switch QF2.S are connected, and the circuit breaker QF2 is closed; at the moment when the circuit breaker QF2 is closed, the pin 56 and the pin 58 of the auxiliary switch QF2.S are disconnected, the circuit breaker QF2 remains closed, the normally closed auxiliary contact QF2.OF is disconnected, and the line 217 is invalid. At this time, the switching of the circuit breaker QF2 is completed.

[0065] See also Figure 4 and Figure 7 , the transfer switches SA5 and SA6 are simultaneously moved to the third column, only pins 65 and 66 of the transfer switch SA5 are connected, pins 69 and 70 of the transfer switch SA6 are connected, lines 309 and 319 are valid, lines 303 and 313 are invalid, since the circuit breakers QF1 and QF2 have been switched at this time, the normally closed auxiliary contacts QF1.OF1, normally closed auxiliary contacts QF2.OF1, normally closed auxiliary contacts QF1.OF, and normally closed auxiliary contacts QF2.OF are all disconnected, the intermediate relay KA34 is actuated, the corresponding normally open auxiliary contacts KA34.1 are closed, and the normally closed auxiliary contacts KA34.2 are disconnected, lines 305 and 307 are invalid, the circuit breaker QF3 is not switched, and pins 78 and 79 of the auxiliary switch QF3.S are disconnected, even if Figure 2 The power-on delay relay KT12 and Figure 3 The power-on delay relay KT22 in the Figure 4 The normally open contact KT12 and the normally open contact KT22 are closed, but the lines 313, 315, 317 and 327 are still ineffective, so the circuit breaker QF3 is not switched at this time.

[0066] At this point, transformer 1T supplies power to bus section I through the closed circuit breaker QF1, and transformer 2T supplies power to bus section II through the closed circuit breaker QF2.

[0067] Step 2: Transformer 1T loses power, circuit breaker QF1 opens, and circuit breaker QF3 is controlled to close, so that the energized transformer 2T supplies power to section II bus, and transformer 2T then supplies power to section I bus through the closed circuit breaker QF3.

[0068] For more details, please see Figure 2 After the transformer 1T loses power, pins 13 and 14 of the undervoltage trip delay relay KT6 receive the power-off signal, and pins 15 and 16 are disconnected, causing the coil I1 between the undervoltage trip terminal D1 and the undervoltage trip terminal D2 of the circuit breaker QF1 to lose power, and the circuit breaker QF1 trips and disconnects, and the entire first incoming line cabinet fails.

[0069] Please continue to see Figure 3 , since transformer 2T is still energized normally, Figure 3 All devices in the circuit breaker QF2 remain in the state after closing.

[0070] Please continue to see Figure 4 Since transformer 1T loses power, circuit breaker QF3 needs to be closed. At this time, pins 65 and 66 of transfer switch SA5 are connected, and line 309 is valid. Since circuit breaker QF1 has been opened, the normally closed auxiliary contact QF1.OF1 is closed, the normally closed auxiliary contact QF1.OF is closed, and lines 305 and 307 are valid. Coil I1 between closing terminal C1 and closing terminal C2 of circuit breaker QF3 is actuated, coil I1 is energized, pins 77 and 79 of auxiliary switch QF3.S are connected, and circuit breaker QF3 is closed; at the moment circuit breaker QF3 is closed, pins 77 and 79 of auxiliary switch QF3.S are disconnected, and circuit breaker QF3 remains closed.

[0071] In the automatic manual recovery mode, when the transformer 1T is restored, the on-site operation and maintenance personnel need to determine whether it is necessary to restore to the split operation mode. If necessary, press the Figure 4 The push button switch SO in the circuit 319, line 321, and line 323 are valid, the intermediate relay KA33 is actuated, the intermediate relay KA34 is actuated, the corresponding normally open auxiliary contact KA34.1 is closed, and the normally closed auxiliary contact KA34.2 is disconnected. Because the push button switch SO is manually pressed, the circuit 317 is valid, and the I2 coil between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, and the coil I2 is energized. Because the circuit breaker QF3 is in the closed state at this time, the pins 78 and 79 of the auxiliary switch QF3.S are in the connected state, the circuit 327 is valid, and the circuit breaker QF3 is opened; at the moment when the circuit breaker QF3 is opened, the pins 78 and 79 of the auxiliary switch QF3.S are disconnected, and the circuit breaker QF3 remains opened; then the push button switch SO is manually pressed again. Figure 2 The push button switch SC in Figure 4The intermediate relay KA33 is activated, so Figure 2 The normally open contact KA33.1 is closed, and the normally closed contact KA33.2 is disconnected. Since the circuit breaker QF3 has been opened, the normally closed auxiliary contact QF3.OF is closed, and the lines 103, 105, and 107 are effective. The coil I2 between the closing terminals C1 and C2 of the circuit breaker QF1 is actuated, the coil I2 is energized, and the circuit breaker QF1 is closed. At this point, the transformer 1T is restored to supply power to the bus section I, and the transformer 2T is restored to supply power to the bus section II.

[0072] Next, since it is in the self-resetting mode, in order for the circuit breaker QF3 to automatically switch when the transformer 1T loses power next time, after the circuit breaker QF1 is switched again, it is necessary to press Figure 4 The middle button switch SB makes the line 321 invalid, and the intermediate relay KA34 operates again, and the corresponding normally open contact KA34.1 returns to the open state, and the corresponding normally closed contact KA34.2 returns to the closed state. In this way, the circuit breaker QF3 can be automatically switched when the transformer 1T loses power next time.

[0073] Step 3: Transformer 2T loses power, circuit breaker QF2 opens, and circuit breaker QF3 is controlled to close, so that the energized transformer 1T supplies power to section I bus, and transformer 1T then supplies power to section II bus through the closed circuit breaker QF3.

[0074] It should be noted that the above step 2 is followed by step 1, and step 3 is also followed by step 1, but there is no logical relationship between step 2 and step 3.

[0075] For more details, see Figure 2 , since transformer 1T is still energized normally, Figure 2 All devices in the circuit breaker QF1 remain in the state after closing.

[0076] See also Figure 3 After the transformer 2T loses power, pins 44 and 45 of the undervoltage trip delay relay KT6 receive the power-off signal, and pins 46 and 47 are disconnected, causing the coil I1 between the undervoltage trip terminal D1 and the undervoltage trip terminal D2 of the circuit breaker QF2 to lose power, and the circuit breaker QF2 trips and disconnects, and the entire second incoming line cabinet fails.

[0077] Please continue to see Figure 4Since transformer 2T loses power, circuit breaker QF3 needs to be closed. At this time, pins 65 and 66 of transfer switch SA5 are connected, and line 309 is valid. Since circuit breaker QF2 has been opened, the normally closed auxiliary contact QF2.OF1 is closed, the normally closed auxiliary contact QF2.OF is closed, and lines 309, 305, and 307 are valid. Coil I1 between closing terminals C1 and C2 of circuit breaker QF3 is activated, and coil I1 is energized. Pins 77 and 79 of auxiliary switch QF3.S are connected, and circuit breaker QF3 is closed; at the moment circuit breaker QF3 is closed, pins 77 and 79 of auxiliary switch QF3.S are disconnected, and circuit breaker QF3 remains closed.

[0078] In the automatic reset mode, when the transformer 2T is restored, you need to manually press Figure 4 The push button switch SO in the circuit 319, line 321, and line 323 are valid, the intermediate relay KA33 is actuated, the intermediate relay KA34 is actuated, the corresponding normally open auxiliary contact KA34.1 is closed, and the normally closed auxiliary contact KA34.2 is disconnected. Because the push button switch SO is manually pressed, the circuit 317 is valid, and the coil i2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, and the coil I2 is energized. Because the circuit breaker QF3 is in the closed state at this time, the pins 78 and 79 of the auxiliary switch QF3.S are in the connected state, the circuit 327 is valid, and the circuit breaker QF3 is opened; at the moment when the circuit breaker QF3 is opened, the pins 78 and 79 of the auxiliary switch QF3.S are disconnected, and the circuit breaker QF3 remains opened; then the push button switch SO is manually pressed again. Figure 3 The push button switch SC in Figure 4 The intermediate relay KA33 is activated, so Figure 2 The normally open contact KA33.1 is closed and the normally closed contact KA33.2 is disconnected. Since the circuit breaker QF3 has been opened, the normally closed auxiliary contact QF3.OF is closed, and the lines 203, 205, and 207 are effective. The coil I2 between the closing terminals C1 and C2 of the circuit breaker QF2 is actuated, the coil I2 is energized, and the circuit breaker QF2 is closed. At this point, the transformer 1T is restored to supply power to the bus section I, and the transformer 2T is restored to supply power to the bus section II.

[0079] Next, since it is in the self-resetting mode, in order for the circuit breaker QF3 to automatically switch when the transformer 2T loses power next time, after the circuit breaker QF2 is switched again, you need to press Figure 4 The middle button switch SB makes the line 321 invalid, and the intermediate relay KA34 operates again, and the corresponding normally open contact KA34.1 returns to the open state, and the corresponding normally closed contact KA34.2 returns to the closed state. In this way, the circuit breaker QF3 can be automatically switched when the transformer 2T loses power next time.

[0080] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A system for realizing multi-mode control by using relays to build logical relationships, characterized in that: It comprises a first incoming line cabinet with a circuit breaker QF1, a second incoming line cabinet with a circuit breaker QF2 and a bus coupling cabinet with a circuit breaker QF3; the incoming line terminal of the first incoming line cabinet is connected to the transformer 1T, and the outgoing line terminal of the first incoming line cabinet is connected to the bus section I; the incoming line terminal of the second incoming line cabinet is connected to the transformer 2T, and the outgoing line terminal of the second incoming line cabinet is connected to the bus section II; the first end of the bus coupling cabinet is connected to the bus section I, and the second end of the bus coupling cabinet is connected to the bus section II; by switching on and off the circuit breakers QF1, QF2 and QF3, power is supplied to the bus sections I and II; The busbar cabinet includes: fuse FU35, circuit breaker QF3, transfer switch SA5, transfer switch SA6, intermediate relay KA33, normally open contact KT12, normally open contact KT22, intermediate relay KA34, push button switch SC, push button switch SO, push button switch SB, auxiliary switch QF3.S, normally closed auxiliary contact QF1.OF, normally closed auxiliary contact QF2.OF, normally closed auxiliary contact QF1.OF1, normally closed auxiliary contact QF1.OF2, normally closed auxiliary contact QF2.OF1, normally closed auxiliary contact QF2.OF2; the intermediate relay KA33 has corresponding normally open contact KA33, normally open contact KA33.1, normally closed contact KA33.2; the intermediate relay KA34 has corresponding normally open contact KA34.1, normally closed contact KA34.2; Connection relationship: Section I busbar is connected to the first incoming line terminal of the busbar cabinet, and the reliable control power supply is connected to the 63rd pin of the transfer switch SA5, the 65th pin of the transfer switch SA5, the 67th pin of the transfer switch SA5, and the 69th pin of the transfer switch SA6 through the fuse FU35; the 66th pin of the transfer switch SA5 is respectively connected to the first terminal of the normally open contact KA34.1, the first terminal of the normally closed auxiliary contact QF1.OF1, and the first terminal of the normally closed auxiliary contact QF2.OF1; the 64th pin of the transfer switch SA5 is respectively connected to the second terminal of the normally open contact KA34.1, the first terminal of the push button switch SC, and the first terminal of the push button switch SO; the transfer switch Pin 68 of SA5 is respectively connected to the first terminal of the normally closed contact KA34.2 and the first terminal of the normally open contact KT12, and the second terminal of the normally open contact KT12 is connected to the first terminal of the normally open contact KT22; the second terminal of the normally closed contact KA34.2 is respectively connected to the first terminal of the normally closed auxiliary contact QF1.OF2 and the first terminal of the normally closed auxiliary contact QF2.OF2; the second terminal of the push button switch SC is respectively connected to the second terminal of the normally closed auxiliary contact QF1.OF1, the second terminal of the normally closed auxiliary contact QF2.OF1, the second terminal of the normally closed auxiliary contact QF1.OF2, the second terminal of the normally closed auxiliary contact QF2.OF2, The first terminal of the normally closed auxiliary contact QF1.OF and the first terminal of the normally closed auxiliary contact QF2.OF are connected; the second terminal of the normally closed auxiliary contact QF1.OF and the second terminal of the normally closed auxiliary contact QF2.OF are respectively connected to the closing terminal C1 of the circuit breaker QF3; the second terminal of the push button switch SO and the second terminal of the normally open contact KT22 are respectively connected to the opening terminal B1 of the circuit breaker QF3; the pin 70 of the transfer switch SA6 is respectively connected to the first terminal of the push button switch SB and the first control terminal of the intermediate relay KA34, the second terminal of the push button switch SB is respectively connected to the first terminal of the push button switch SO and the first terminal of the normally open contact KA33, and the push button The second terminal of the switch SO and the second terminal of the normally open contact KA33 are respectively connected to the first control terminal of the intermediate relay KA33; the closing terminal C2 of the circuit breaker QF3 is connected to the pin 77 of the auxiliary switch QF3.S, and the opening terminal B2 of the circuit breaker QF3 is connected to the pin 78 of the auxiliary switch QF3.S; the pin 79 of the auxiliary switch QF3.S, the second control terminal of the intermediate relay KA33, and the second control terminal of the intermediate relay KA34 are all connected to the reliable control power supply neutral line of the main coupling cabinet, and the outlet terminal of the main coupling cabinet is connected to the bus section II; a coil I1 is connected between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3, and a coil I2 is connected between the opening terminal B1 and the opening terminal B2.

2. The system for realizing multi-mode control by using relays to establish logical relationships according to claim 1, characterized in that: The first incoming line cabinet includes: fuse FU15, fuse FU16, circuit breaker QF1, transfer switch SA1, transfer switch SA2, symmetrical on-off delay relay KT11, power-on delay relay KT12, power-off delay relay KT13, normally open contact KA33.1, normally closed contact KA33.2, voltage relay JVR, undervoltage release delay relay KT6, undervoltage release electrical resetter QF1.KT, button Switch SC, push button switch SO, auxiliary switch QF1.S, normally closed auxiliary contact QF1.OF, normally closed auxiliary contact QF2.OF, normally closed auxiliary contact QF3.OF; the symmetrical on-off delay relay KT11 corresponds to the normally open contact KT11.1 and the normally open contact KT11.2; the power-on delay relay KT12 corresponds to the normally open contact KT12; the power-off delay relay KT13 corresponds to the normally closed contact KT13; Connection relationship: Transformer 1T is connected to the incoming terminal of the first incoming cabinet, and the reliable control power supply is connected to pin 1 of the transfer switch SA1, pin 3 of the transfer switch SA1, pin 5 of the transfer switch SA1, pin 7 of the transfer switch SA2, and the first control terminal of the symmetrical on-off delay relay KT11 through the fuse FU15; pin 4 of the transfer switch SA1 is connected to the first terminal of the normally open contact KA33.1 and the first terminal of the normally closed contact KA33.2, respectively, and pin 2 of the transfer switch SA1 is connected to the second terminal of the normally open contact KA33.1, the first terminal of the push button switch SC, and the first terminal of the push button switch SO; pin 6 of the transfer switch SA1 is connected to the normally closed contact KA33.2 The second terminal of the push button switch SC is connected to the second terminal of the normally open contact KT11.1, the first terminal of the normally open contact KT11.2, and the first terminal of the normally closed auxiliary contact QF2.OF; the second terminal of the normally open contact KT11.2 is connected to the first terminal of the normally closed contact KT13, and the second terminal of the normally closed contact KT13 and the second terminal of the push button switch SO are respectively connected to the opening terminal B1 of the circuit breaker QF1; the second terminal of the normally closed auxiliary contact QF2.OF and the second terminal of the normally closed auxiliary contact QF3.OF are respectively connected to the closing terminal C1 of the circuit breaker QF1. Connection; Pin 8 of the transfer switch SA2 is connected to Pin 11 of the voltage relay JVR, and Pin 12 of the voltage relay JVR is respectively connected to the second control terminal of the symmetrical on-off power delay relay KT11, the first control terminal of the power-on delay relay KT12, and the first control terminal of the power-off delay relay KT13; the incoming terminal of the first incoming line cabinet is connected to Pin 13 of the undervoltage tripping delay relay KT6 through the fuse FU16, Pin 15 of the undervoltage tripping delay relay KT6 is connected to the undervoltage tripping terminal D1 of the circuit breaker QF1, and Pin 16 of the undervoltage tripping delay relay KT6 is connected to the undervoltage tripping terminal D2 of the circuit breaker QF1; the closing terminal C2 of the circuit breaker QF1 is connected to Pin 25 of the auxiliary switch QF1.S, and the circuit breaker The opening terminal B2 of QF1 is connected to pin 26 of the auxiliary switch QF1.S; pin 14 of the undervoltage tripping delay relay KT6, pin 27 of the auxiliary switch QF1.S, the third control terminal of the symmetrical on-off delay relay KT11, the second control terminal of the power-on delay relay KT12, and the second control terminal of the power-off delay relay KT13 are all connected to the reliable control power supply neutral line of the first incoming line cabinet; a coil I1 is connected between the undervoltage tripping terminal D1 and the undervoltage tripping terminal D2 of the circuit breaker QF1, a coil I2 is connected between the closing terminal C1 and the closing terminal C2, a coil I3 is connected between the opening terminal B1 and the opening terminal B2, and a coil I4 is connected between the reset terminal R1 and the reset terminal R2 of the undervoltage tripping electrical resetter QF1.KT.

3. The system for realizing multi-mode control by using relays to establish logical relationships according to claim 1, characterized in that: The second incoming line cabinet includes: fuse FU25, fuse FU26, circuit breaker QF2, transfer switch SA3, transfer switch SA4, symmetrical on-off delay relay KT21, power-on delay relay KT22, power-off delay relay KT23, normally open contact KA33.1, normally closed contact KA33.2, voltage relay JVR, undervoltage release delay relay KT6, undervoltage release electrical resetter QF2.KT, button Switch SC, push button switch SO, auxiliary switch QF2.S, normally closed auxiliary contact QF1.OF, normally closed auxiliary contact QF2.OF, normally closed auxiliary contact QF3.OF; the symmetrical on-off delay relay KT21 corresponds to the normally open contact KT21.1 and the normally open contact KT21.2; the power-on delay relay KT22 corresponds to the normally open contact KT22; the power-off delay relay KT23 corresponds to the normally closed contact KT23; Connection relationship: Transformer 2T is connected to the incoming terminal of the second incoming cabinet, and the reliable control power supply is connected to pin 32 of the transfer switch SA3, pin 34 of the transfer switch SA3, pin 36 of the transfer switch SA3, pin 38 of the transfer switch SA4, and the first control terminal of the symmetrical on-off delay relay KT21 through fuse FU25; pin 35 of the transfer switch SA3 is connected to the first terminal of the normally open contact KA33.1 and the first terminal of the normally closed contact KA33.2, respectively, and pin 33 of the transfer switch SA3 is connected to the second terminal of the normally open contact KA33.1, the first terminal of the push button switch SC, and the first terminal of the push button switch SO; pin 37 of the transfer switch SA3 is connected to the normally closed contact K The second terminal of A33.2 is connected to the first terminal of the normally open contact KT21.1 and the first terminal of the normally open contact KT21.2; the second terminal of the push button switch SC is respectively connected to the second terminal of the normally open contact KT21.1, the first terminal of the normally closed auxiliary contact QF1.OF and the first terminal of the normally closed auxiliary contact QF3.OF; the second terminal of the normally open contact KT21.2 is connected to the first terminal of the normally closed contact KT23, the second terminal of the normally closed contact KT23 and the second terminal of the push button switch SO are respectively connected to the opening terminal B1 of the circuit breaker QF2; the second terminal of the normally closed auxiliary contact QF1.OF and the second terminal of the normally closed auxiliary contact QF3.OF are respectively connected to the closing terminal B1 of the circuit breaker QF2. The pin 39 of the transfer switch SA4 is connected to the pin 42 of the voltage relay JVR, and the pin 43 of the voltage relay JVR is respectively connected to the second control terminal of the symmetrical on-off delay relay KT21, the first control terminal of the power-on delay relay KT22, and the first control terminal of the power-off delay relay KT23; the incoming terminal of the first incoming cabinet is connected to the pin 44 of the undervoltage tripping delay relay KT6 through the fuse FU26, the pin 46 of the undervoltage tripping delay relay KT6 is connected to the undervoltage tripping terminal D1 of the circuit breaker QF2, and the pin 47 of the undervoltage tripping delay relay KT6 is connected to the undervoltage tripping terminal D2 of the circuit breaker QF2; the closing terminal C2 of the circuit breaker QF2 is connected to the pin 56 of the auxiliary switch QF2.S, and the circuit breaker QF2 is connected to the undervoltage tripping terminal D2 of the circuit breaker QF2. The opening terminal B2 of the circuit breaker QF2 is connected to the pin 57 of the auxiliary switch QF1.S; the pin 45 of the undervoltage tripping delay relay KT6, the pin 58 of the auxiliary switch QF2.S, the third control terminal of the symmetrical on-off delay relay KT21, the second control terminal of the power-on delay relay KT22, and the second control terminal of the power-off delay relay KT23 are all connected to the reliable control power supply neutral line of the second incoming line cabinet; a coil I1 is connected between the undervoltage tripping terminal D1 and the undervoltage tripping terminal D2 of the circuit breaker QF2, a coil I2 is connected between the closing terminal C1 and the closing terminal C2, a coil I3 is connected between the opening terminal B1 and the opening terminal B2, and a coil I4 is connected between the reset terminal R1 and the reset terminal R2 of the undervoltage tripping electrical resetter QF2.KT.

4. A method for realizing multi-mode control by building logical relationships using relays, based on the system according to any one of claims 1 to 3, characterized in that: Implementing the hand casting mode includes the following steps: Step 1, turn the transfer switch SA1 and the transfer switch SA2 to the first column at the same time, manually press the button switch SC in the first incoming line cabinet, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is actuated, and the circuit breaker QF1 is closed; the normally closed auxiliary contact QF1.OF is disconnected, and the circuit breaker QF1 is switched on and off at this time; Turn the transfer switch SA3 and the transfer switch SA4 to the first column at the same time, and manually press the button switch SC in the second incoming line cabinet. The coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, and the circuit breaker QF2 is closed; the normally closed auxiliary contact QF2.OF is disconnected, and the circuit breaker QF2 is switched on and off at this time; Step 2: After the transformer 1T loses power, the undervoltage tripping delay relay KT6 in the first incoming line cabinet is disconnected, causing the circuit breaker QF1 to trip and disconnect; at this time, the button switch SC in the busbar cabinet is manually pressed, and the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is closed; Step 3: After the transformer 2T loses power, the undervoltage tripping delay relay KT6 in the second incoming line cabinet is disconnected, causing the circuit breaker QF2 to trip and disconnect; at this time, the button switch SC in the busbar cabinet is manually pressed, and the coil I1 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is closed; There is no logical relationship between step 2 and step 3.

5. A method for realizing multi-mode control by building logical relationships using relays, based on the system according to any one of claims 1 to 3, characterized in that: To achieve the automatic transfer and automatic recovery mode, the following steps are included: Step 1, the transfer switch SA1 and the transfer switch SA2 are simultaneously turned to the second column. After the voltage relay JVR in the first incoming line cabinet detects that there is a normal voltage, the voltage relay JVR is closed, the power-off delay relay KT13 is actuated, and the corresponding normally closed contact KT13 is disconnected at the 0th second. The symmetrical on-off delay relay KT11 is actuated, and the corresponding normally open contact KT11.1 is closed at the 15th second, and the normally open contact KT11.2 is closed at the 15th second. The coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is actuated, and the circuit breaker QF1 is closed. At this time, the switching of the circuit breaker QF1 is completed; The transfer switches SA3 and SA4 are simultaneously turned to the second column. After the voltage relay JVR in the second incoming line cabinet detects normal voltage, the voltage relay JVR is closed, the power-off delay relay KT23 is actuated, and the corresponding normally closed contact KT23 is disconnected at the 0th second. The symmetrical on-off delay relay KT21 is actuated, and the corresponding normally open contact KT21.1 is closed at the 15th second, and the normally open contact KT21.2 is closed at the 15th second. The coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, and the circuit breaker QF2 is closed. At this time, the switching of the circuit breaker QF2 is completed; Step 2: After the transformer 1T loses power, the undervoltage tripping delay relay KT6 in the first incoming line cabinet is disconnected, causing the circuit breaker QF1 to trip and disconnect; the transfer switch SA5 and the transfer switch SA6 are simultaneously turned to the second column, and the coil I1 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is closed; When transformer 1T is restored, the voltage relay JVR in the first incoming cabinet detects that the voltage is normal, then the voltage relay JVR is closed, the power-off delay relay KT13 is actuated, and the corresponding normally closed contact KT13 is disconnected at the 0th second, the symmetrical power-on and power-off delay relay KT11 is actuated, and the corresponding normally open contact KT11.1 is closed at the 15th second, and the normally open contact KT11.2 is closed at the 15th second, the power-on delay relay KT12 is actuated, and the normally open contact KT12 is closed at the 10th second; the coil I2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is opened; the coil I2 between the opening terminal C1 and the opening terminal C2 of the circuit breaker QF1 is actuated, and QF1 is closed and switched on; Step 3: After the transformer 2T loses power, the undervoltage tripping delay relay KT6 in the second incoming line cabinet is disconnected, so that the circuit breaker QF2 is disconnected; the transfer switch SA5 and the transfer switch SA6 are simultaneously turned to the second column, and the coil I1 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is closed; When transformer 2T is restored, the voltage relay JVR in the second incoming cabinet detects that the voltage is normal, then the voltage relay JVR is closed, the power-off delay relay KT23 is actuated, and the corresponding normally closed contact KT23 is disconnected at the 0th second, the symmetrical power-on and power-off delay relay KT21 is actuated, and the corresponding normally open contact KT21.1 is closed at the 15th second, and the normally open contact KT21.2 is closed at the 15th second, the power-on delay relay KT22 is actuated, and the normally open contact KT22 is closed at the 10th second; the coil I2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is opened; the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, and QF2 is closed and switched on; There is no logical relationship between step 2 and step 3.

6. A method for realizing multi-mode control by building logical relationships using relays, based on the system according to any one of claims 1 to 3, characterized in that: To implement the self-pitcher recovery mode, the following steps are included: Step 1, turn the transfer switch SA1 and the transfer switch SA2 to the third column at the same time. After the voltage relay JVR in the first incoming line cabinet detects that there is a normal voltage, the voltage relay JVR is closed, the power-off delay relay KT13 is actuated, and the corresponding normally closed contact KT13 is disconnected at the 0th second. The symmetrical on-off delay relay KT11 is actuated, and the corresponding normally open contact KT11.1 is closed at the 15th second, and the normally open contact KT11.2 is closed at the 15th second. The coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is actuated, and the circuit breaker QF1 is closed. At this time, the switching of the circuit breaker QF1 is completed; The transfer switches SA3 and SA4 are simultaneously turned to the third column. After the voltage relay JVR in the second incoming line cabinet detects normal voltage, the voltage relay JVR is closed, the power-off delay relay KT23 is actuated, and the corresponding normally closed contact KT23 is disconnected at the 0th second. The symmetrical on-off delay relay KT21 is actuated, and the corresponding normally open contact KT21.1 is closed at the 15th second, and the normally open contact KT21.2 is closed at the 15th second. The coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, and the circuit breaker QF2 is closed. At this time, the switching of the circuit breaker QF2 is completed; Step 2: After the transformer 1T loses power, the undervoltage tripping delay relay KT6 in the first incoming line cabinet is disconnected, causing the circuit breaker QF1 to trip and disconnect; the transfer switches SA5 and SA6 are simultaneously turned to the third column, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is closed; when the transformer 1T is restored, the on-site operation and maintenance personnel need to determine whether it is necessary to restore to the split operation mode. If necessary, manually press the button switch SO in the mother coupling cabinet, the intermediate relay KA33 is actuated, and the intermediate relay KA33 is actuated. Relay KA34 is actuated, the corresponding normally open auxiliary contact KA34.1 is closed, the normally closed auxiliary contact KA34.2 is disconnected, the coil I2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is opened; then the button switch SC in the first incoming line cabinet is manually pressed, and because the intermediate relay KA33 is actuated, the normally open contact KA33.1 is closed, the normally closed contact KA33.2 is disconnected, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF1 is actuated, and the circuit breaker QF1 is closed; Step 3: After the transformer 2T loses power, the undervoltage tripping delay relay KT6 in the second incoming line cabinet is disconnected, causing the circuit breaker QF2 to trip and disconnect; the transfer switches SA5 and SA6 are simultaneously turned to the third column, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is closed; when the transformer 2T is restored, the on-site operation and maintenance personnel need to determine whether it is necessary to restore to the split operation mode. If necessary, manually press the button switch SO in the mother coupling cabinet, the intermediate relay KA33 is actuated, and the intermediate relay KA33 is actuated. Relay KA34 is actuated, the corresponding normally open auxiliary contact KA34.1 is closed, the normally closed auxiliary contact KA34.2 is disconnected, the coil I2 between the opening terminal B1 and the opening terminal B2 of the circuit breaker QF3 is actuated, and the circuit breaker QF3 is opened; then the button switch SC in the second incoming line cabinet is manually pressed, and because the intermediate relay KA33 is actuated, the normally open contact KA33.1 is closed, the normally closed contact KA33.2 is disconnected, the coil I2 between the closing terminal C1 and the closing terminal C2 of the circuit breaker QF2 is actuated, and the circuit breaker QF2 is closed; There is no logical relationship between step 2 and step 3.

7. The method for realizing multi-mode control by building logical relationships using relays according to claim 6, characterized in that: In the self-resetting mode, when the transformer 1T resumes power supply and the circuit breaker QF1 is re-closed, press the button switch SB in the main coupling cabinet, the intermediate relay KA34 will operate again, and the corresponding normally open contact KA34.1 will return to the open state, and the corresponding normally closed contact KA34.2 will return to the closed state.

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