A disconnector control circuit

Abstract

The application provides an isolating switch control circuit, which is applied to a single bus section connection with a bypass, and adopts a brand-new outgoing line control circuit, a bypass control circuit, a section switch control circuit and a bypass connection switch control circuit. The control circuit is simplified, and under the premise of realizing the anti-misoperation locking, various normal operations cannot be locked by mistake, so that the safety of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of disconnector switch control technology, and in particular to a disconnector switch control circuit. Background Technology

[0002] Disconnecting switches (also known as "knife switches") are among the most common electrical devices in substations, used to connect or disconnect high-voltage circuits. Compared to circuit breakers (also known as "switches"), which also connect or disconnect high-voltage circuits, knife switches lack an arc-extinguishing chamber in their mechanical structure; therefore, their maximum connecting or disconnecting current generally does not exceed 5A. If the connecting or disconnecting current exceeds the knife switch's maximum connecting or disconnecting capacity, an accident may occur; this is called "closing (opening) the knife switch under load." Simultaneously, if electrical equipment is grounded and connected to other live equipment via a knife switch, an extremely large fault current will be generated, far exceeding the knife switch's maximum connecting capacity; this is called "closing the switch with the ground wire connected." Both "closing (opening) the knife switch under load" and "closing the switch with the ground wire connected" are strictly prohibited "malicious electrical misoperations" in power systems.

[0003] Disconnectors with voltage levels of 110kV and above have two operating modes: electric and manual. For electrically operated disconnectors, to prevent "serious electrical misoperation" accidents, relevant anti-misoperation interlocking measures need to be implemented in the electric operation control circuit of the disconnector. This typically involves connecting auxiliary contacts of other switches, disconnectors, and grounding switches (referred to as "grounding switches") related to the disconnector in series. The electric operation control circuit of this disconnector can only be activated when the relevant equipment is in the correct state. Therefore, the anti-misoperation interlocking logic and the electric operation control circuit are different for disconnectors with different main wiring methods or in different locations under the same main wiring method.

[0004] "Single busbar segmented with bypass and the bypass switch also functions as a segment switch" is a relatively special main wiring configuration. Under this configuration, the interlocking logic of the bypass switch on the busbar side of the equipment bay not on the same busbar as the bypass switch is more complex than the normal interlocking logic, and the electric operation control circuit is also more complex. For this wiring configuration, four types of disconnectors are most critical: bypass disconnectors in each outgoing line (main transformer) bay, bypass disconnectors in the bypass bay, segment disconnectors, and bypass-connected disconnectors. For these four types of disconnectors, the existing basic approach to preventing misoperation interlocking is still to connect the auxiliary contacts of the relevant switches or disconnectors to the control circuit of this disconnector. The electric operation control circuit of this disconnector can only be activated when the relevant equipment is in the correct state.

[0005] However, there is no unified standard regarding which auxiliary contacts of switches, disconnectors, or grounding switches should be connected to the control circuit of each of the four types of disconnectors mentioned above—that is, the specific interlocking logic conditions. The design of the corresponding electrical interlocking circuits in the electrical control circuits of the four most critical types of disconnectors is not perfect, leading to two types of problems: 1. Inability to completely interlock erroneous operations; 2. Incorrectly interlocking normal operations in certain situations. For example:

[0006] 1. The bypass switch interlocking circuit of each outgoing line (main transformer) bay has defects. Under the above wiring method, there are two situations for the outgoing line (main transformer) bay: (1) connected to the same busbar as the bypass bay; (2) connected to a different busbar than the bypass bay. In the prior art, different electrical interlocking logics are adopted for the bypass switches of these two types of outgoing line (main transformer) bays. This approach not only complicates the switch control circuit, but may also lead to the erroneous blocking of the normal operation of the switch in some cases.

[0007] 2. The interlocking circuit of the sectional disconnector has defects. Under the above wiring method, the sectional disconnector actually has two different operating scenarios: (1) When both busbars are running, it cooperates with the bypass bay and the bypass disconnector to realize the parallel operation of the two busbars; (2) When one busbar is running normally, while the other busbar is unloaded or out of service, the sectional disconnector is used to de-energize the unloaded busbar or charge the out-of-service busbar. In the existing technology, only the first scenario is considered and the second scenario is not considered, which leads to the sectional disconnector being incorrectly interlocked in the second operation. Summary of the Invention

[0008] The purpose of this invention is to propose a disconnector control circuit that simplifies the control circuit and ensures that, while achieving anti-misoperation interlocking, various normal operations will not be erroneously interlocked, thus ensuring that the sectional disconnector can operate correctly under various circumstances.

[0009] As one aspect of the present invention, a disconnector control circuit is provided, applied in a single busbar segmented wiring with bypass, comprising:

[0010] The first busbar and the second busbar connected to the first busbar via a sectional disconnector;

[0011] The bypass busbar is connected to the first busbar via a bypass bay and to the second busbar via a bypass disconnect switch.

[0012] Multiple outgoing line bays are led out from the first busbar and the second busbar, and each outgoing line bay is connected to the bypass busbar through a bypass switch.

[0013] The first busbar, the second busbar, and the bypass busbar are each connected to a transformer coil via a PT interval, and the PT interval includes at least one grounding switch.

[0014] Each outgoing line bay includes a busbar-side disconnect switch, an outgoing line circuit breaker, and a bypass busbar-side disconnect switch connected in series. The busbar-side disconnect switch is connected to the first busbar or the second busbar. One end of the bypass disconnect switch in the outgoing line bay is connected to the bypass busbar, and the other end is connected between the circuit breaker and the bypass busbar-side disconnect switch.

[0015] The bypass bay includes a bus-side disconnect switch, a bypass circuit breaker, and a bypass disconnect switch connected in series. The bus-side disconnect switch is connected to the first bus, and the bypass disconnect switch is connected to the bypass bus.

[0016] The bypass switch in each outgoing line bay is controlled by a preset outgoing line control circuit; the bypass switch in the bypass bay is controlled by a preset bypass control circuit; the segmented switch is controlled by a preset segmented switch control circuit; and the bypass switch is controlled by a preset bypass switch control circuit, in order to realize the anti-misoperation interlocking of each switch and the driving circuit of each switch motor.

[0017] Preferably, the outgoing line control circuit includes:

[0018] The first control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar.

[0019] The first switching handle has its first and third ends connected to the ninth connection part of the control box; its second end is connected to an outgoing control panel, and the other side of the outgoing control panel is connected to the eighth and tenth connection parts of the control box respectively; the fourth end of the first switching handle is connected in series with the first five anti-lock and the first emergency stop button, and the other end of the first emergency stop button is connected to the eighth connection part of the control box through the first closing button and to the tenth connection part of the control box through the first opening button.

[0020] Between the fifteenth and sixteenth connection parts of the control box are connected in series the normally closed auxiliary contact of the outgoing side grounding switch in the outgoing line bay, the normally open auxiliary contact of the bypass bus side disconnect switch, and the normally open contact of the blocking relay PBJ in the bypass circuit breaker.

[0021] Preferably, the bypass control loop includes:

[0022] The second control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar.

[0023] Between the fifth and sixth terminals of the control box, the power supply air switch of the bypass bay, the normally closed auxiliary contact of the bypass circuit breaker, the normally closed auxiliary contact of the grounding switch of the PT bay on the bypass bus side, the normally closed auxiliary contacts of each bypass disconnector of all outgoing bays, the normally closed auxiliary contacts of the bypass disconnector, and the bypass interlocking relay are connected in series.

[0024] The second switching handle has its first and third ends connected to the ninth connection part of the control box; its second end is connected to a bypass monitoring and control panel, and the other side of the bypass monitoring and control panel is connected to the eighth and tenth connection parts of the control box respectively; the fourth end of the second switching handle is connected in series with the second fifth anti-lock and the second emergency stop button, and the other end of the second emergency stop button is connected to the eighth connection part of the control box through the second closing button and to the tenth connection part of the control box through the second opening button.

[0025] A normally closed auxiliary contact of a bypass circuit breaker and a normally closed auxiliary contact of a grounding switch in the PT bay on the bypass busbar side are connected in series between the fifteenth and sixteenth connection parts of the control box.

[0026] Preferably, the segmented disconnect switch control circuit includes:

[0027] The third control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar.

[0028] The third switching handle has its first and third ends connected to the ninth connection part of the control box; its second end is connected to a busbar and a PT control panel, and the other side of the busbar and the PT control panel is connected to the eighth and tenth connection parts of the control box respectively; the fourth end of the third switching handle is connected in series with the third fifth anti-lock and the third emergency stop button, and the other end of the third emergency stop button is connected to the eighth connection part of the control box through the third closing button and to the tenth connection part of the control box through the third opening button.

[0029] Three branches are connected in parallel between the fifteenth and sixteenth connecting parts of the control box, wherein:

[0030] The first branch consists of the normally open auxiliary contacts of the bypass disconnectors, bypass circuit breakers, bus-side disconnectors, and bypass disconnectors in the interconnected bypass bays.

[0031] The second branch consists of the normally closed auxiliary contacts of the bus-side disconnectors, bus-side disconnectors, and grounding switches in the PT bay, which are connected in series on the first bus side.

[0032] The third branch consists of the bus-side disconnectors on the second busbar side and the normally closed auxiliary contacts of the grounding switch in the PT bay, which are connected in series.

[0033] Preferably, the bypass disconnector control circuit includes:

[0034] The fourth control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar.

[0035] The fourth switching handle has its first and third ends connected to the ninth connection part of the control box; its second end is connected to a busbar and a PT control panel, and the other side of the busbar and the PT control panel is connected to the eighth and tenth connection parts of the control box respectively; the fourth end of the fourth switching handle is connected in series with the fourth and fifth anti-lock and the fourth emergency stop button, and the other end of the fourth emergency stop button is connected to the eighth connection part of the control box through the fourth closing button and to the tenth connection part of the control box through the fourth opening button.

[0036] The normally closed auxiliary contact of the grounding switch of the PT interval on the second busbar side and the normally open contact of the blocking relay PBJ in the bypass circuit breaker are connected in series between the fifteenth and sixteenth connection parts of the control box.

[0037] Preferably, the AC busbar is a three-phase four-wire AC busbar, which is connected to a miniature circuit breaker. Its A phase is connected to the first, fourth, and sixth connection parts of the corresponding control box, its B phase is connected to the second connection part of the control box, its C phase is connected to the third connection part of the control box, and its N line is connected to the fifth and seventh connection parts of the control box.

[0038] Preferably, the normally open contact PBJ in each outgoing control circuit is controlled by the coil of the locking relay PBJ in the bypass switch control circuit.

[0039] Implementing the embodiments of the present invention has the following beneficial effects:

[0040] This invention provides a disconnector control circuit that, in a single busbar segmented wiring configuration with bypass, employs novel outgoing line control circuits, bypass control circuits, segmented disconnector control circuits, and bypass disconnector control circuits. This not only simplifies the control circuit but also ensures that, while implementing anti-misoperation interlocking, various normal operations are not erroneously blocked, thus improving equipment safety. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0042] Figure 1 This is a schematic diagram illustrating the application environment of a disconnector control circuit provided by the present invention.

[0043] Figure 2 This is a schematic diagram of the outgoing line control circuit according to an embodiment of the present invention.

[0044] Figure 3 This is a schematic diagram of the bypass control loop involved in an embodiment of the present invention.

[0045] Figure 4 This is a schematic diagram of the segmented disconnector control circuit involved in an embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of the bypass disconnector control circuit according to an embodiment of the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 The diagram shown illustrates the application environment of a disconnector control circuit provided by this invention. (In conjunction with...) Figures 2 to 5 As shown, in this embodiment, the disconnector control circuit is applied to a single busbar segmented wiring with bypass, and it includes at least:

[0049] The first busbar (110KV1M) and the second busbar (110KV2M) connected to the first busbar via a sectional disconnector (10012).

[0050] The bypass busbar (110KV3M) is connected to the first busbar through a bypass bay and to the second busbar through a bypass disconnector (10023);

[0051] Multiple outgoing line bays are led out from the first busbar and the second busbar, and each outgoing line bay is connected to the bypass busbar through a bypass disconnect switch; for example, in Figure 1 In the structure shown, the second busbar leads out two outgoing bays (WL1 and WL2), while the first busbar leads out one outgoing bay (WL3).

[0052] The first busbar, the second busbar, and the bypass busbar are each connected to a transformer coil via a PT bay, and the PT bay includes at least one grounding switch. Specifically, the first busbar is connected to the transformer coil (111PT), with the PT terminal being 111PT1 and its grounding switch being labeled (111A0); the second busbar is connected to the transformer coil (112PT), with the PT terminal being 112PT1 and its grounding switch being labeled (112A0); and the bypass busbar is connected to the transformer coil (113PT), with the PT terminal being 113PT1, and the bypass busbar PT bay has a secondary terminal (113PT0) and its grounding switch being labeled (113A0).

[0053] Each outgoing line bay includes a bus-side disconnect switch, an outgoing circuit breaker, and a bypass bus-side disconnect switch connected in series. The bus-side disconnect switch is connected to the first bus or the second bus. One end of the bypass disconnect switch in the outgoing line bay is connected to the bypass bus, and the other end is connected between the circuit breaker and the bypass bus-side disconnect switch. Specifically, in outgoing line bay WL1, it includes a bus-side disconnect switch (11032), an outgoing circuit breaker (1103), and a bypass bus-side disconnect switch (11034), which is connected to the bypass bus via a bypass disconnect switch (11024). The other two outgoing line bays WL2 and WL3 have the same structure, only the component designations are different. For details, please refer to [link to relevant documentation]. Figure 1 As shown. For example, outgoing line bay WL2 includes a bus-side disconnector (11022), an outgoing circuit breaker (1102), and a bypass bus-side disconnector (11024); outgoing line bay WL3 includes a bus-side disconnector (11011), an outgoing circuit breaker (1101), and a bypass bus-side disconnector (11014). It is understood that in this invention, the main station bay (not shown) can also adopt the structure of the outgoing line bay described above. For ease of explanation, only the structure of the outgoing line bay and the corresponding control circuit are described below. This control circuit can also be used to control the main station bay.

[0054] The bypass bay includes a bus-side disconnect switch (10311), a bypass circuit breaker (1031), and a bypass disconnect switch (10313) connected in series. The bus-side disconnect switch (10311) is connected to the first bus, and the bypass disconnect switch (10313) is connected to the bypass bus.

[0055] It is understood that the main wiring method of the disconnector control circuit provided by the present invention is a single busbar segmented wiring with bypass connection, without a dedicated segmented switch, the bypass switch also serves as a segmented switch, and in substations equipped with segmented disconnectors (10012) and bypass disconnectors (10023), an open disconnector control circuit with a voltage level of 35kV and above can be realized.

[0056] Specifically, the bypass disconnectors in each outgoing line bay are controlled by a preset outgoing line control circuit; the bypass disconnectors in the bypass bay are controlled by a preset bypass control circuit; the segmented disconnectors are controlled by a preset segmented disconnector control circuit; and the bypass disconnectors are controlled by a preset bypass disconnector control circuit, in order to realize the anti-misoperation interlocking of each disconnector and the driving circuit of each disconnector motor. The following will be combined with the appendix... Figure 2-5 Each control loop is described in detail.

[0057] like Figure 2The diagram shows a schematic representation of an outgoing line control circuit according to the present invention. It can be understood that the bypass switch in each outgoing line bay is controlled by a pre-set outgoing line control circuit. Figure 2 The diagram shows the outgoing line control circuit corresponding to the bypass switch (11023) in outgoing line bay WL2. The bypass switches (such as 11013 and 11033) in other outgoing line bays can use the same outgoing line control circuit.

[0058] More specifically, the outgoing line control circuit includes at least:

[0059] The first operating box (11023 disconnector operating box) includes a motor circuit and has multiple connection parts (XT1-1 to XT1-16). Some of these connection parts are connected to an AC busbar. Specifically, the AC busbar is a three-phase four-wire AC busbar (~A, ~B, ~C, ~N), which is connected to a miniature circuit breaker (3MCB). Phase A is connected to the first, fourth, and sixth connection parts of the corresponding operating box (i.e., XT1-1, XT1-4, XT1-4), phase B is connected to the second connection part (XT1-2), phase C is connected to the third connection part (XT1-3), and the N wire is connected to the fifth and seventh connection parts (i.e., XT1-5, XT1-7). The phase A terminal (A31), phase B terminal (B31), and phase C terminal (C31) of the AC busbar are respectively connected to the corresponding terminals of the operating box.

[0060] The first switching handle (3QK) has its first and third ends connected to the ninth connection part (XT1-9) of the first operating box; its second end is connected to an outgoing line monitoring and control panel (1102 monitoring and control panel), and the other side of the outgoing line monitoring and control panel is connected to the eighth and tenth connection parts (XT1-8, XT1-10) of the operating box respectively; the fourth end of the first switching handle is connected in series with the first five-proof interlock (3G05) and the first emergency stop button (3GWF), and the other end of the first emergency stop button (3GWF) is connected to the eighth connection part (XT1-8) of the operating box through the first closing button (3HA), and connected to the tenth connection part (XT1-10) of the operating box through the first opening button (3TA); the first switching handle (3QK) is equipped with a remote operation contact (3G01), a local operation contact (3G03), and an auxiliary contact (3G033). The first closing button (3HA) is connected to the first operating box through the closing control contact (3G09).

[0061] Between the fifteenth and sixteenth connection parts (i.e., XT1-15 and XT1-16) of the control box, there are connected in series the normally closed auxiliary contact of the outgoing side grounding switch (110240) in the outgoing line bay, the normally open auxiliary contact of the bypass bus side disconnect switch (11024), and the normally open contact of the blocking relay PBJ in the bypass circuit breaker (1031). The blocking circuit is provided with an input terminal (3G13), an intermediate terminal (3G17), and an output terminal (3G19).

[0062] In an embodiment of the present invention, the first switching handle (3QK) is a remote-to-local switching handle for a knife switch, which includes two docking points. One docking point (first and second ends) is used to realize the remote operation of the relevant knife switch, and the other docking point (third and fourth ends) is used to realize the local operation of the relevant knife switch.

[0063] The function of the outgoing line monitoring and control panel is to remotely operate the relevant disconnect switches.

[0064] The first five-proof interlock (3GWF) is used to provide a microcomputer-based five-proof interlock function when the relevant disconnector is operated locally.

[0065] The first emergency stop button (3GJT) is used to provide an emergency stop function when the relevant disconnect switch is operated locally and a misoperation occurs.

[0066] The functions of the first trip button (3TA) and the first close button (3HA) are to enable local tripping or closing operations of the relevant disconnectors.

[0067] The first control box includes the motor circuit of the relevant knife switch. When the control circuit of the relevant knife switch is turned on, the motor circuit of the relevant knife switch is turned on, and the moving and stationary contacts of the relevant knife switch are driven to open and close.

[0068] In the above-mentioned outgoing control circuit, the anti-misoperation interlocking part consists of an external circuit, namely the normally closed auxiliary contact of 110240, the normally open auxiliary contact of 11024, and the normally open contact of the interlocking relay PBJ in the bypass circuit breaker (1031) connected in series. Its function is to prevent the relevant disconnectors from closing with the grounding switch or from opening and closing the disconnectors under load.

[0069] More specifically, taking the second outgoing line bay WL2 as an example, when remotely operating the disconnect switch, the control circuit is connected as follows: ~A-3MCB-(XT1-6)-(XT1-9)-3QK(1-2)-1102 Measurement and Control Panel-(XT1-8) / (XT1-10)-(XT1-15)-110240 Normally Closed Contact-11024 Normally Open Contact-PBJ Normally Open Contact-(XT1-16)-(XT1-5)-~N

[0070] When operating the disconnect switch locally, the control circuit is connected as follows: ~A-3MCB-(XT1-6)- (XT1-9)-3QK(3-4)-3GWF-3GJT-3HA / 3TA-(XT1-8) / (XT1-10)-(XT1-15)-110240 normally closed contact-11024 normally open contact-PBJ normally open contact-(XT1-16)-(XT1-5)-~N.

[0071] As can be seen from the above, in the wiring of a single busbar segmented circuit with bypass, the outgoing line (main transformer bay) has two scenarios: first, it is connected to the same busbar segment as the bypass bay; second, it is connected to a different busbar. In existing operations, the electrical interlocking logic for these two scenarios differs. For the first scenario, the state of the segmented disconnectors does not need to be considered; however, for the second scenario, the two busbar segments must be connected in parallel before the bypass disconnector of the bay being replaced can be operated. Therefore, in existing technologies, not only is the disconnector control circuit very complex, but it may also lead to erroneous interlocking of normal disconnector operation in certain situations. The structure adopted in this invention summarizes a unified interlocking logic condition for the bypass disconnectors of these two types of bays, without distinguishing whether they are on the same busbar as the bypass bay, nor distinguishing between closing and opening operations. This not only simplifies the control circuit but also ensures that, while implementing anti-misoperation interlocking, various normal operations will not be erroneously interlocked.

[0072] like Figure 3 The diagram shows a schematic representation of a bypass control circuit for controlling a bypass switch in a bypass bay, as per the present invention. Specifically, the bypass control circuit includes:

[0073] The second control box (10313 disconnector control box) includes a motor circuit and has multiple connection points, some of which are connected to an AC busbar. The specific connection between the AC busbar and the second control box can be referred to the aforementioned section. Figure 2 Description;

[0074] Between the fourth and seventh terminals of the second operating box, the following components are connected in series: a power supply circuit breaker (1ZK) for the bypass bay, a normally closed auxiliary contact of the bypass circuit breaker (1031), a normally closed auxiliary contact of the grounding switch (113A00) for the PT bay on the bypass busbar side, normally closed auxiliary contacts of each bypass disconnector (11013, 11023, 11033) for all outgoing bays, a normally closed auxiliary contact of the bypass disconnector (10023), and a bypass interlocking relay (PBJ); the AC busbar of the bypass control circuit is equipped with A-phase terminal (A21), B-phase terminal (B21), and C-phase terminal (C21); the bypass bay is equipped with a power supply miniature circuit breaker (2MCB).

[0075] The second switching handle (2QK), whose first and third ends are connected to the ninth connecting part of the second operating box; its second end is connected to a bypass measurement and control panel (1031 measurement and control panel), and the other side of the bypass measurement and control panel is respectively connected to the eighth and tenth connecting parts of the second operating box; the fourth end of the second switching handle is sequentially connected in series with a second five-prevention lock (2G05) and a second emergency stop button (2GWF), and the other end of the second emergency stop button (2GWF) is respectively connected to the eighth connecting part of the operating box through a second closing button (2HA) and to the tenth connecting part of the operating box through a second tripping button (2TA); the bypass measurement and control panel is provided with an input contact (2G01), an output contact (2G03), an auxiliary contact (2G033), and a common contact (2G11); the second closing button (2HA) is connected to the second operating box through a closing contact (2G09); the second emergency stop button is provided with an auxiliary contact (2GJT);

[0076] A normally closed auxiliary contact of the bypass circuit breaker (1031) and a normally closed auxiliary contact of the grounding knife (113A00) of the bypass bus side PT interval are connected in series between the fifteenth and sixteenth connecting parts of the operating box. The bypass interlock circuit is provided with terminals (2G13, 2G15, 2G17).

[0077] It can be understood that, in the embodiment of the present invention, the normally open contacts PBJ in each outgoing line control circuit are controlled by the coil of the interlock relay PBJ in the bypass disconnecting switch control circuit.

[0078] Among them, the functions of components such as the second switching handle (2QK), the second five-prevention lock (2G05), the second emergency stop button (2GWF), the second closing button (2HA), and the second tripping button (2TA) can be referred to and combined with the foregoing description of Figure 2 .

[0079] In the bypass control circuit provided by the present invention, its anti-misoperation interlock part includes two external circuits.

[0080] Specifically, the first external circuit is the series-connected normally closed auxiliary contacts of 1ZK, 1031, 113A00, 11013, 11023, 11033, 10023 and PBJ described above; its function is to connect or disconnect the normally open contact of the above-mentioned bypass interlock relay PBJ to achieve anti-misoperation interlock for the above-mentioned bypass disconnecting switches and bypass connecting switches, and prevent the relevant disconnecting switches from closing with the grounding knife or pulling and closing the disconnecting switches with load.

[0081] The second external circuit is: the series-connected normally closed auxiliary contact of the bypass circuit breaker (1031) and the normally closed auxiliary contact of the grounding knife (113A00) of the bypass bus side PT interval; its function is to provide an anti-misoperation interlock function for the bypass disconnecting switch of the bypass interval, and prevent the disconnecting switch from closing with the grounding knife or pulling and closing the disconnecting switch with load.

[0082] More specifically, in this bypass control circuit, when remotely operating the disconnecting switch, the control circuit is connected in the following manner: ~A - 2MCB - (XT1 - 6) - (XT1 - 9) - 2QK(1 - 2) - 1031 measuring and control panel - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - 1031 normally closed contact - 113A00 normally closed contact - (XT1 - 16) - (XT1 - 5) - ~N.

[0083] When locally operating the disconnecting switch, the control circuit is connected in the following manner: ~A - 3MCB - (XT1 - 6) - (XT1 - 9) - 2QK(3 - 4) - 2GWF - 2GJT - 2HA / 2TA - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - 1031 normally closed contact - 113A00 normally closed contact - (XT1 - 16) - (XT1 - 5) - ~N.

[0084] The excitation circuit of the bypass blocking relay PBJ is connected in the following manner: ~A - 2MCB - 1ZK - 1031 normally closed contact - 113A00 normally closed contact - 11013 normally closed contact - 11023 normally closed contact - 11033 normally closed contact - 10023 normally closed contact - PBJ coil - ~N.

[0085] As can be seen from the above, in the present invention, the bypass disconnecting switch control circuit includes two parts: one part is the blocking circuit for preventing misoperation of itself, and the other part is the blocking circuit for preventing misoperation of other bays. For the blocking circuit for preventing misoperation of itself, regardless of its closing circuit or opening circuit, the same blocking circuit for preventing misoperation is adopted, that is, the normally closed auxiliary contacts of the circuit breaker in this bay and the normally closed auxiliary contacts of the bypass bus grounding switch are connected in series. For the blocking circuit for preventing misoperation of other bays, by connecting the normally closed auxiliary contacts of the switch in this bay, the normally closed auxiliary contacts of the bypass bus grounding switch, the normally closed auxiliary contacts of the bypass disconnecting switches of all bays, and the normally closed auxiliary contacts of the bypass - connecting disconnecting switch in series with the coil of the bypass blocking relay, and then using the contacts of the bypass blocking relay inserted into the control circuits of the bypass disconnecting switches of other bays, the blocking of misoperation of the bypass disconnecting switches of other bays is achieved.

[0086] As Figure 4 shown, a schematic structural diagram of the sectional disconnecting switch control circuit for controlling the sectional disconnecting switch according to the present invention is shown. The sectional disconnecting switch control circuit includes:

[0087] The third operation box (10012 disconnecting switch operation box), which includes a motor circuit inside, and has a plurality of connection parts on it, and some of the connection parts are connected to an AC small bus; the specific connection between the AC small bus and the third operation box can be referred to the foregoing for Figure 2Description: The sectional disconnector control circuit is equipped with a miniature circuit breaker (4MCB); the AC busbar of the sectional circuit is equipped with A-phase terminal (A41), B-phase terminal (B41), and C-phase terminal (C41).

[0088] The third switching handle (4QK) has its first and third ends connected to the ninth connection part of the third operating box; its second end is connected to a busbar and a PT monitoring and control panel, and the other side of the busbar and the PT monitoring and control panel is connected to the eighth and tenth connection parts of the third operating box, respectively; the fourth end of the third switching handle is connected in series with the third fifth anti-lock (4G05) and the third emergency stop button (4GWF), and the other end of the third emergency stop button (4GWF) is connected to the eighth connection part of the third operating box through the third closing button (4HA) and to the tenth connection part of the third operating box through the third opening button (4TA); the third switching handle is equipped with a remote contact (4G01), a local contact (4G03), and an auxiliary contact (4G033); the third closing button is connected to the third operating box through the closing contact (4G09); the third emergency stop button is equipped with an auxiliary contact (4GJT); the segmented interlocking circuit is equipped with terminals (4G13, 4G19).

[0089] Three branches are connected in parallel between the fifteenth and sixteenth connecting parts of the third operating box, wherein:

[0090] The first branch consists of the normally open auxiliary contacts of the bypass disconnector (10313), bypass circuit breaker (1031), bus-side disconnector (10311), and bypass connection disconnector (10023) in the interconnected bypass bay;

[0091] The second branch consists of the normally closed auxiliary contacts of the bus-side disconnectors (11011), the bus-side disconnectors (10311), and the grounding switch (111A00) of the PT bay, which are connected in series with each other.

[0092] The third branch consists of the normally closed auxiliary contacts of the bus-side disconnectors (11022, 1032) on the second bus side and the grounding switch (112A00) in the PT bay, which are connected in series.

[0093] Through the three branches mentioned above, it is possible to use sectional disconnectors to connect busbars in parallel, and to charge or shut down the first or second busbar. Specifically:

[0094] When remotely operating the disconnecting switch, if the sectionalizing disconnecting switch (10012) is used for busbar paralleling, the control circuit is connected as follows: ~A - 4MCB - (XT1 - 6) - (XT1 - 9) - 4QK(1 - 2) - busbar and PT measurement and control panel - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - normally open contact of 10023 - normally open contact of 10313 - normally open contact of 1031 - normally open contact of 10311 - (XT1 - 16) - (XT1 - 5) - ~N.

[0095] When remotely operating the disconnecting switch, if the sectionalizing disconnecting switch (10012) is used for charging or decommissioning the first busbar, the control circuit is connected as follows: ~A - 4MCB - (XT1 - 6) - (XT1 - 9) - 4QK(1 - 2) - busbar and PT measurement and control panel - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - normally closed contact of 111A00 - normally closed contact of 11011 - normally closed contact of 10311 - (XT1 - 16) - (XT1 - 5) - ~N.

[0096] When remotely operating the disconnecting switch, if the sectionalizing disconnecting switch (10012) is used for charging or decommissioning the second busbar, the control circuit is connected as follows: ~A - 4MCB - (XT1 - 6) - (XT1 - 9) - 4QK(1 - 2) - busbar and PT measurement and control panel - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - normally closed contact of 112A00 - normally closed contact of 11022 - normally closed contact of 11032 - (XT1 - 16) - (XT1 - 5) - ~N.

[0097] When locally operating the disconnecting switch, if the sectionalizing disconnecting switch (10012) is used for busbar paralleling, the control circuit is connected as follows: ~A - 4MCB - (XT1 - 6) - (XT1 - 9) - 4QK(3 - 4) - 4GWF - 4GJT - 4HA / 4TA - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - normally open contact of 10023 - normally open contact of 10313 - normally open contact of 1031 - normally open contact of 10311 - (XT1 - 16) - (XT1 - 5) - ~N.

[0098] When locally operating the disconnecting switch, if the sectionalizing disconnecting switch 10012 is used for charging or decommissioning the first busbar, the control circuit is connected as follows: ~A - 4MCB - (XT1 - 6) - (XT1 - 9) - 4QK(3 - 4) - 4GWF - 4GJT - 4HA / 4TA - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - normally closed contact of 111A00 - normally closed contact of 11011 - normally closed contact of 10311 - (XT1 - 16) - (XT1 - 5) - ~N.

[0099] When performing in-situ operation of the disconnecting switch, if the sectionalizing disconnecting switch 10012 is used to charge or decommission the second bus, the control circuit is connected in the following manner: ~A - 4MCB - (XT1 - 6) - (XT1 - 9) - 4QK(3 - 4) - 4GWF - 4GJT - 4HA / 4TA - (XT1 - 8) / (XT1 - 10) - (XT1 - 15) - normally closed contact of 112A00 - normally closed contact of 11022 - normally closed contact of 11032 - (XT1 - 16) - (XT1 - 5) - ~N.

[0100] In summary, in the present invention, by analyzing three operation situations of the sectionalizing disconnecting switch, three different anti-misoperation interlocking circuits are designed for the three operation situations, and the interlocking circuits of the three operation situations are connected in parallel. For the interlocking circuit during bus sectionalization or paralleling, the normally open auxiliary contacts of the bypass disconnecting switch, bypass circuit breaker, bus-side disconnecting switch, and shunt disconnecting switch in the bypass interval are connected in series. For bus charging or decommissioning, regardless of the charging operation circuit or decommissioning operation circuit, the normally closed auxiliary contacts of the bus-side grounding switch of the corresponding bus and the normally closed contacts of the bus-side disconnecting switches of all intervals on that bus are connected in series.

[0101] As Figure 5 shown, a schematic structural diagram of a shunt disconnecting switch control circuit for controlling the shunt disconnecting switch according to the present invention is shown. Specifically, the shunt disconnecting switch control circuit includes:

[0102] The fourth operation box (disconnecting switch operation box 10023), which includes a motor circuit inside, and has a plurality of connection parts on it, and some of the connection parts are connected to an AC small bus; the specific connection between the AC small bus and the fourth operation box can be referred to the description of Figure 2 above; a miniature circuit breaker (5MCB) is provided in the shunt disconnecting switch control circuit; the shunt circuit AC small bus is provided with an A-phase terminal (A21), a B-phase terminal (B21), and a C-phase terminal (C21);

[0103] The fourth switching handle (5QK), its first and third terminals are connected to the ninth connecting part of the fourth operating box; its second terminal is connected to a busbar and a PT measurement and control panel, and the other sides of the busbar and the PT measurement and control panel are respectively connected to the eighth and tenth connecting parts of the fourth operating box; the fourth terminal of the fourth switching handle is sequentially connected in series with a fourth five-prevention lock (5GWF) and a fourth emergency stop button (5GJT), and the other end of the fourth emergency stop button (5GJT) is respectively connected to the eighth connecting part of the operating box through a fourth closing button (5HA), and connected to the tenth connecting part of the operating box through a fourth tripping button (5TA); the fourth switching handle is provided with a remote contact (5G01), a local contact (5G03), an auxiliary contact (5G033), and a common contact (5G11); the fourth closing button is connected to the fourth operating box through a closing contact (5G09); the fourth five-prevention lock is provided with a contact (5G05);

[0104] A normally closed auxiliary contact of the grounding knife (112A00) of the second busbar side PT interval and a normally open contact of the blocking relay PBJ in the bypass circuit breaker are connected in series between the fifteenth and sixteenth connecting parts of the fourth operating box. The by-pass blocking circuit is provided with terminals (5G13, 5G17, 5G19).

[0105] It can be understood that in the above-mentioned knife-switch control circuit, the anti-misoperation blocking part consists of an external circuit, that is, the serially connected normally closed auxiliary contact of 112A00 and the normally open contact of PBJ, and its function is to prevent closing the knife-switch with the grounding knife or pulling and closing the knife-switch with load when operating the by-pass knife-switch (10023).

[0106] When performing remote operation of the knife-switch, the control circuit is connected in the following manner: ~A-5MCB-(XT1-6)-(XT1-9)-5QK(1-2)-busbar and PT measurement and control panel-(XT1-8) / (XT1-10)-(XT1-15)-normally closed contact of 112A00-normally open contact of PBJ-(XT1-16)-(XT1-5)-~N.

[0107] When performing local operation of the knife-switch, the control circuit is connected in the following manner: ~A-5MCB-(XT1-6)-(XT1-9)-5QK(3-4)-5GWF-5GJT-5HA / 5TA-(XT1-8) / (XT1-10)-(XT1-15)-normally closed contact of 112A00-normally open contact of PBJ-(XT1-16)-(XT1-5)-~N.

[0108] In summary, in the present invention, for the by-pass knife-switch, regardless of its closing circuit or tripping circuit, the same anti-misoperation blocking circuit is adopted, that is, the normally closed auxiliary contact of the grounding knife of the PT interval of the busbar where it is located and the normally open contact of the blocking relay PBJ in the bypass circuit breaker are serially connected.

[0109] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0110] This invention provides a disconnector control circuit that, in a single busbar segmented wiring configuration with bypass, employs novel outgoing line control circuits, bypass control circuits, segmented disconnector control circuits, and bypass disconnector control circuits. This not only simplifies the control circuit but also ensures that, while implementing anti-misoperation interlocking, various normal operations are not erroneously blocked, thus improving equipment safety.

[0111] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A disconnector control circuit, applied in a single busbar segmented wiring with bypass, characterized in that, At least including: The first busbar and the second busbar connected to the first busbar via a sectional disconnector; The bypass busbar is connected to the first busbar via a bypass bay and to the second busbar via a bypass disconnect switch. Multiple outgoing line bays are led out from the first busbar and the second busbar, and each outgoing line bay is connected to the bypass busbar through a bypass switch. The first busbar, the second busbar, and the bypass busbar are each connected to a transformer coil via a PT interval, and the PT interval includes at least one grounding switch. Each outgoing line bay includes a busbar-side disconnect switch, an outgoing line circuit breaker, and a bypass busbar-side disconnect switch connected in series. The busbar-side disconnect switch is connected to the first busbar or the second busbar. One end of the bypass disconnect switch in the outgoing line bay is connected to the bypass busbar, and the other end is connected between the circuit breaker and the bypass busbar-side disconnect switch. The bypass bay includes a bus-side disconnect switch, a bypass circuit breaker, and a bypass disconnect switch connected in series. Its bus-side disconnect switch is connected to the first bus, and its bypass disconnect switch is connected to the bypass bus. The bypass switch in each outgoing line bay is controlled by a preset outgoing line control circuit; the bypass switch in the bypass bay is controlled by a preset bypass control circuit; the segmented switch is controlled by a preset segmented switch control circuit; and the bypass switch is controlled by a preset bypass switch control circuit, in order to realize the anti-misoperation interlocking of each switch and drive the motor circuit of each switch. The outgoing control circuit includes: The first control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar. The first switching handle has its first and third ends connected to the ninth connection part of the first operating box; its second end is connected to an outgoing line monitoring and control panel, and the other side of the outgoing line monitoring and control panel is respectively connected to the eighth and tenth connection parts of the first operating box; the fourth end of the first switching handle is connected in series with the first five anti-lock and the first emergency stop button, and the other end of the first emergency stop button is respectively connected to the eighth connection part of the first operating box through the first closing button and connected to the tenth connection part of the first operating box through the first opening button. Between the fifteenth and sixteenth connection parts of the first operating box are connected in series the normally closed auxiliary contact of the outgoing side grounding switch in the outgoing line bay, the normally open auxiliary contact of the bypass busbar side switch, and the normally open contact of the blocking relay PBJ in the bypass circuit breaker. The bypass control loop includes: The second control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar. Between the fourth and seventh terminals of the second control box, the power supply air switch of the bypass bay, the normally closed auxiliary contact of the bypass circuit breaker, the normally closed auxiliary contact of the grounding switch of the PT bay on the bypass bus side, the normally closed auxiliary contacts of each bypass disconnector of all outgoing bays, the normally closed auxiliary contacts of the bypass disconnector, and the bypass interlocking relay are connected in series. The second switching handle has its first and third ends connected to the ninth connection part of the first operating box; its second end is connected to a bypass monitoring and control panel, and the other side of the bypass monitoring and control panel is connected to the eighth and tenth connection parts of the second operating box respectively; the fourth end of the second switching handle is connected in series with the second fifth anti-lock and the second emergency stop button, and the other end of the second emergency stop button is connected to the eighth connection part of the second operating box through the second closing button and to the tenth connection part of the first operating box through the second opening button. A normally closed auxiliary contact of a bypass circuit breaker and a normally closed auxiliary contact of a grounding switch in the PT bay on the bypass busbar side are connected in series between the fifteenth and sixteenth connection parts of the first operating box. The segmented disconnect switch control circuit includes: The third control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar. The third switching handle has its first and third ends connected to the ninth connection part of the third operating box; its second end is connected to a busbar and a PT monitoring and control panel, and the other side of the busbar and the PT monitoring and control panel is respectively connected to the eighth and tenth connection parts of the third operating box; the fourth end of the third switching handle is connected in series with the third fifth anti-lock and the third emergency stop button, and the other end of the third emergency stop button is connected to the eighth connection part of the third operating box through the third closing button and to the tenth connection part of the third operating box through the third opening button. Three branches are connected in parallel between the fifteenth and sixteenth connecting parts of the third operating box, wherein: The first branch consists of bypass disconnectors, bypass circuit breakers, bus-side disconnectors of the bypass bay, and normally open auxiliary contacts of the bypass disconnectors connected in series. The second branch consists of the normally closed auxiliary contacts of the busbar side disconnect switch in the outgoing bay of the first busbar, the busbar side disconnect switch in the bypass bay, and the grounding switch in the PT bay, which are connected in series. The third branch consists of the bus-side disconnectors on the second busbar side and the normally closed auxiliary contacts of the grounding switch in the PT bay, which are connected in series. The bypass disconnector control circuit includes: The fourth control box contains a motor circuit and has multiple connection parts, some of which are connected to an AC busbar. The fourth switching handle has its first and third ends connected to the ninth connection part of the fourth operating box; its second end is connected to a busbar and a PT monitoring and control panel, and the other side of the busbar and the PT monitoring and control panel is respectively connected to the eighth and tenth connection parts of the fourth operating box; the fourth end of the fourth switching handle is connected in series with the fourth and fifth anti-lock and the fourth emergency stop button, and the other end of the fourth emergency stop button is connected to the eighth connection part of the fourth operating box through the fourth closing button and to the tenth connection part of the fourth operating box through the fourth opening button; The normally closed auxiliary contact of the grounding switch of the PT interval on the second busbar side and the normally open contact of the blocking relay PBJ in the bypass circuit breaker are connected in series between the fifteenth and sixteenth connection parts of the fourth operating box.

2. The circuit as described in claim 1, characterized in that, The AC busbar is a three-phase four-wire AC busbar, which is connected to a miniature circuit breaker. Its A phase is connected to the first, fourth, and sixth connection parts of the corresponding control box, its B phase is connected to the second connection part of the corresponding control box, its C phase is connected to the third connection part of the corresponding control box, and its N line is connected to the fifth and seventh connection parts of the corresponding control box.

3. The circuit as described in claim 2, characterized in that, The normally open contact PBJ in each outgoing control circuit is controlled by the coil of the lockout relay PBJ in the bypass switch control circuit.

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