Control circuit and looped network switch cabinet

Abstract

The utility model relates to a control circuit and a looped network switch cabinet. The control circuit comprises a control unit, a first circuit breaker of an outgoing line cabinet, a first grounding switch of the outgoing line cabinet, a second circuit breaker of an incoming line cabinet and a second grounding switch of the incoming line cabinet. The first circuit breaker is respectively connected with the first grounding switch and the output end of the wire outlet cabinet, and the second circuit breaker is respectively connected with the second grounding switch and the input end of the wire inlet cabinet; and the control unit is used for controlling the closing and locking loop where the first circuit breaker is located to be in an open state and / or controlling the closing and locking loop where the second circuit breaker is located to be in an open state through the first grounding switch and the second grounding switch. According to the technical scheme of the invention, the electrical locking between the circuit breaker and the grounding switch can be realized, so that the situation of wrong power transmission when the line side grounding switch is switched on can be avoided, the maintenance time can be shortened, and the maintenance efficiency can be improved. And therefore, the safety of the maintenance equipment and related operators can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic technology, and in particular to a control circuit and a ring network switch cabinet. Background Art

[0002] Ring network switchgear is mainly used for ring network operation in power systems, and can realize ring network power supply of power systems. In related technologies, when the ring network switchgear is shut down for maintenance, temporary maintenance grounding is performed on the maintenance line to maintain the ring network switchgear. Utility Model Content

[0003] The purpose of the present disclosure is to provide a control circuit and a ring network switch cabinet to solve the technical problems existing in the above-mentioned related technologies.

[0004] In order to achieve the above-mentioned object, in a first aspect, the present disclosure provides a control circuit applied to a ring network switch cabinet, comprising a control unit, a first circuit breaker of an outgoing cabinet, a first grounding switch of the outgoing cabinet, a second circuit breaker of an incoming cabinet, and a second grounding switch of the incoming cabinet;

[0005] The first circuit breaker is connected to the first grounding switch and the output end of the outgoing line cabinet respectively, and the second circuit breaker is connected to the second grounding switch and the input end of the incoming line cabinet respectively;

[0006] The control unit is used to control the closing lock circuit where the first circuit breaker is located to be in an open state, and / or control the closing lock circuit where the second circuit breaker is located to be in an open state through the first grounding switch and the second grounding switch.

[0007] Optionally, the control unit is used to control the closing lockout circuit where the first circuit breaker is located to be in an open state, and / or control the closing lockout circuit where the second circuit breaker is located to be in an open state when the first opening signal of the first grounding switch and the second opening signal of the second grounding switch are not received at the same time.

[0008] Optionally, the control unit includes a first opening switch of the first grounding switch and a second opening switch of the second grounding switch, the first opening switch and the second opening switch are connected in series in a closing lockout circuit where the first circuit breaker is located, and / or,

[0009] The control unit comprises a third opening switch of the first grounding switch and a fourth opening switch of the second grounding switch. The third opening switch and the fourth opening switch are connected in series in a closing lockout loop where the second circuit breaker is located.

[0010] Optionally, the first circuit breaker includes a first electromagnet and a first working position switch, the first contact of the second opening switch is connected to the first electromagnet through the first working position switch, the second contact of the second opening switch is connected to the third contact of the first opening switch, and the fourth contact of the first opening switch is connected to the outlet cabinet, and / or,

[0011] The second circuit breaker includes a second electromagnet and a second working position switch, the fifth contact of the third opening switch is connected to the second electromagnet through the second working position switch, the sixth contact of the third opening switch is connected to the seventh contact of the fourth opening switch, and the eighth contact of the fourth opening switch is connected to the incoming line cabinet.

[0012] Optionally, the control unit includes a first protection device, a second protection device, a first opening switch of the first grounding switch, and a second opening switch of the second grounding switch;

[0013] The input end of the first protection device is connected to the opening contact of the first grounding switch, the output end of the first protection device is connected to the first circuit breaker, the input end of the second protection device is connected to the opening contact of the second grounding switch, the output end of the second protection device is connected to the second circuit breaker, and the first protection device and the second protection device are connected through a single-mode optical cable;

[0014] The first protection device is used to control the closing lock circuit where the first circuit breaker is located to be in an open state when the first opening signal of the first grounding switch and the second opening signal transmitted by the second protection device are not received at the same time;

[0015] The second protection device is used to control the closing lock circuit where the second circuit breaker is located to be in an open state when the second opening signal of the second grounding switch and the first opening signal transmitted by the first protection device are not received at the same time.

[0016] Optionally, the first protection device comprises a first board, a second board and a first logic controller, the input end of the first board is connected to the opening contact of the first grounding switch, the input end of the second board is connected to the output end of the second protection device, and the output end of the first board and the output end of the second board are both connected to the first logic controller;

[0017] The first board is used to receive the first opening signal of the first grounding switch, and transmit the first opening signal to the first logic controller;

[0018] The second board is used to receive the second opening signal transmitted by the second protection device, and transmit the second opening signal to the first logic controller;

[0019] The first logic controller is used to control the closing lock circuit where the first circuit breaker is located to be in an open state when the first opening signal and the second opening signal are not received at the same time.

[0020] Optionally, the first protection device further comprises a first switch, the first switch is connected to the first logic controller, and the first switch is connected in series in a closing lockout circuit of the first circuit breaker;

[0021] The first logic controller is used to control the first switch to be in an open state when the second opening signal and the first opening signal are not received simultaneously, so that the closing lock circuit where the first circuit breaker is located is in an open state.

[0022] Optionally, the second protection device comprises a third board, a fourth board and a second logic controller, the input end of the third board is connected to the opening contact of the second grounding switch, the input end of the fourth board is connected to the output end of the first protection device, and the output end of the third board and the output end of the fourth board are both connected to the second logic controller;

[0023] The third board is used to receive the second opening signal and transmit the second opening signal to the second logic controller;

[0024] The fourth board is used to receive the first opening signal transmitted by the first protection device, and transmit the first opening signal to the second logic controller;

[0025] The second logic controller is used to control the closing lock circuit where the second circuit breaker is located to be in an open state when the second opening signal and the first opening signal are not received at the same time.

[0026] Optionally, the second protection device further comprises a second switch, the second switch is connected to the second logic controller, and the second switch is connected in series in a closing lockout circuit of the second circuit breaker;

[0027] The second logic controller is used to control the second switch to be in an open state when the second opening signal and the first opening signal are not received at the same time, so that the closing lock circuit where the second circuit breaker is located is in an open state.

[0028] Optionally, the control unit is used to:

[0029] After receiving the first grounding signal of the first grounding switch, controlling the closing lock circuit where the first circuit breaker is located to be in an open state, and / or,

[0030] After receiving the second grounding signal of the second grounding switch, the closing lock circuit where the second circuit breaker is located is controlled to be in an open state.

[0031] Optionally, the control circuit further includes a first detector, a third switch, a second detector and a fourth switch, and the control unit includes a first controller and a second controller;

[0032] The input end of the first controller is connected to the first detector, the output end of the first controller is connected to the third switch, and the third switch is connected in series in the closing circuit where the first circuit breaker is located; the input end of the second controller is connected to the second detector, the output end of the second controller is connected to the fourth switch, and the fourth switch is connected in series in the closing circuit where the second circuit breaker is located;

[0033] The first detector is used to detect the first ground signal and transmit the first ground signal to the first controller;

[0034] The first controller is used to control the third switch to be in an open state after receiving the first grounding signal, so that the closing lock circuit where the first circuit breaker is located is in an open state;

[0035] The second detector is used to detect the second ground signal and transmit the second ground signal to the second controller;

[0036] The second controller is used to control the fourth switch to be in an open state after receiving the second grounding signal, so that the closing lock circuit where the second circuit breaker is located is in an open state.

[0037] In a second aspect, the present disclosure provides a ring network switch cabinet, comprising any control circuit provided in the first aspect of the present disclosure.

[0038] Through the above technical solution, a control unit is set in the ring network switch cabinet, and the control unit controls the closing lock circuit of the first circuit breaker to be in an open state through the first grounding switch and the second grounding switch, and / or controls the closing lock circuit of the second circuit breaker to be in an open state. According to the first grounding switch and the second grounding switch, the control unit controls the closing lock circuit of the first circuit breaker to be disconnected, and / or the closing lock circuit of the second circuit breaker to be disconnected, so that the electrical lock between the circuit breaker and the grounding switch can be achieved, thereby avoiding the situation that the line side grounding switch is mistakenly sent when closing. Compared with the temporary grounding maintenance method in the related art, the maintenance time can be reduced, thereby improving the maintenance efficiency. At the same time, the situation of mistaken power transmission can be avoided, thereby improving the safety of maintenance equipment and related operators.

[0039] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0041] Figure 1 is a schematic diagram showing a control circuit according to an exemplary embodiment of the present disclosure.

[0042] Figure 2 is a schematic diagram showing a control circuit according to an exemplary embodiment of the present disclosure.

[0043] Figure 3 It is a schematic diagram showing a closing lockout circuit of a first circuit breaker according to an exemplary embodiment of the present disclosure.

[0044] Figure 4 is a schematic diagram showing a closing lockout circuit of a second circuit breaker according to an exemplary embodiment of the present disclosure.

[0045] Figure 5 is a schematic diagram showing a control circuit according to an exemplary embodiment of the present disclosure.

[0046] Figure 6 The figure is a schematic diagram showing the connection between the first protection device and the second protection device according to an exemplary embodiment of the present disclosure.

[0047] Figure 7 It is a connection diagram showing a closing lockout circuit of a first circuit breaker according to an exemplary embodiment of the present disclosure.

[0048] Figure 8 It is a schematic diagram showing signal control in a first protection device and a second protection device according to an exemplary embodiment of the present disclosure.

[0049] Fig. 9 It is a connection diagram showing a closing lockout circuit of a second circuit breaker according to an exemplary embodiment of the present disclosure.

[0050] Fig.10 is a schematic diagram showing a control circuit according to an exemplary embodiment of the present disclosure.

[0051] Fig.11 The figure is a schematic diagram showing the connection between the first detector and the first controller according to an exemplary embodiment of the present disclosure.

[0052] Fig.12 It is a schematic diagram showing a closing lockout circuit of a first circuit breaker according to an exemplary embodiment of the present disclosure.

[0053] Fig.13 The invention is a block diagram showing a ring network switch cabinet according to an exemplary embodiment.

[0054] Description of Reference Numerals

[0055] 1. Output end of the outgoing cabinet; 2. First circuit breaker; 3. Control unit; 4. Input end of the incoming cabinet; 5. Second circuit breaker; 6. First grounding switch; 7. Second grounding switch; 1301. Ring network switch cabinet; 1302. Control circuit. DETAILED DESCRIPTION

[0056] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0057] In the AC ring network power supply of the Yunba line, power is mainly supplied through a "hand-in-hand" single ring network power supply method. This power supply method mainly provides reliable power supply and stable operation through power supply support between adjacent power supply partitions. When this method is used for power supply, the current direction of the ring network switch cabinet flows from the bus side to the line side, or from the line side to the bus side. In order to avoid the occurrence of erroneous operation of the upstream step-down station sending power downward when the grounding switch of the downstream step-down station is closed during operation, the grounding switch is not installed on the line side of the KYN28 ring network switch cabinet. And through a temporary maintenance grounding method, maintenance is carried out when the ring network switch cabinet is out of power.

[0058] In the related art, the conventionally configured grounding switch is removed from the line side of the outgoing cabinet and the incoming cabinet of the ring network switch cabinet, directly avoiding the possibility of the circuit breaker closing when the line side grounding switch is closed. Alternatively, a grounding switch is set on the line side of the incoming cabinet and the outgoing cabinet of the ring network switch cabinet, and the grounding switch acts on the electrical interlock between the circuit breaker and the grounding switch on this side.

[0059] The inventors found that when the circuit breaker is closed or opened by the method in the related art, the ring network switch cabinet can only be repaired by temporary grounding during power outage maintenance, which increases the maintenance time and reduces the maintenance efficiency. When the circuit breaker is locked by the local grounding switch, there may be a risk of mis-powering when the inter-station cable is grounded, reducing the safety of the equipment and related operators in maintenance.

[0060] In view of this, the present disclosure provides a control circuit and a ring network switch cabinet to solve the technical problems existing in the above related technologies.

[0061] like Figure 1 As shown, Figure 1 is a schematic diagram showing a control circuit according to an exemplary embodiment of the present disclosure, referring to Figure 1, applied to a ring network switch cabinet, comprising a control unit 3, a first circuit breaker 2 of an outgoing cabinet, a first grounding switch 6 of the outgoing cabinet, a second circuit breaker 5 of an incoming cabinet, and a second grounding switch 7 of the incoming cabinet;

[0062] The first circuit breaker 2 is respectively connected to the first grounding switch 6 and the output terminal 1 of the outgoing cabinet, and the second circuit breaker 5 is respectively connected to the second grounding switch 7 and the input terminal 4 of the incoming cabinet;

[0063] The control unit 3 is used to control the closing lock circuit of the first circuit breaker 2 to be in an open state through the first grounding switch 6 and the second grounding switch 7, and / or control the closing lock circuit of the second circuit breaker 5 to be in an open state.

[0064] Through the above technical solution, a control unit 3 is provided in the ring network switch cabinet, and the control unit 3 controls the closing lock circuit of the first circuit breaker 2 to be in an open state through the first grounding switch 6 and the second grounding switch 7, and / or controls the closing lock circuit of the second circuit breaker 5 to be in an open state. According to the first grounding switch 6 and the second grounding switch 7, the control unit 3 controls the closing lock circuit of the first circuit breaker 2 to be disconnected, and / or the closing lock circuit of the second circuit breaker 5 to be disconnected, so that the electrical interlock between the circuit breaker and the grounding switch can be achieved, thereby avoiding the occurrence of the situation that the line side grounding switch is mistakenly supplied with power when closing. Compared with the temporary grounding maintenance method in the related art, the maintenance time can be reduced, thereby improving the maintenance efficiency. At the same time, the situation that the power is mistakenly supplied can be avoided, thereby improving the safety of the maintenance equipment and related operators.

[0065] In order to enable those skilled in the art to better understand the control circuit provided by the present disclosure, the above steps are described in detail with examples below.

[0066] For example, the ring network switch cabinet includes an incoming cabinet, an outgoing cabinet, a first circuit breaker 2, a first grounding switch 6, a second circuit breaker 5, and a second grounding switch 7. When the ring network switch cabinet needs to receive an external power supply, the external power supply can be connected to other electronic components of the ring network switch cabinet through the first circuit breaker 2. When the ring network switch cabinet needs to transmit power to an external switch device or load, the internal current can be output through the second circuit breaker 5 and the outgoing cabinet.

[0067] Among them, the outgoing cabinet in the ring network switch cabinet can be used to receive power input from an external power supply or other power supplies. The incoming cabinet of the ring network switch cabinet can be used to output power from the ring network switch cabinet to different switch devices or loads. The first circuit breaker 2 can be used to control the flow direction of the input current of the outgoing cabinet. The second circuit breaker 5 can be used to control the flow direction of the current output from the incoming cabinet to the switch device or load. The first grounding switch 6 and the second grounding switch 7 can both ground the equipment or power system in the ring network switch cabinet.

[0068] In the embodiment of the present disclosure, the first grounding switch 6 can be connected to the first circuit breaker 2, and the second grounding switch 7 can be connected to the second circuit breaker 5. The control unit 3 can control the closing lockout circuit where the first circuit breaker 2 is located to be in an open state, and / or control the closing lockout circuit where the second circuit breaker 5 is located to be in an open state through the first grounding switch 6 and the second grounding switch 7. Among them, the closing lockout circuit can be used to close the circuit breaker while ensuring the safety of the circuit breaker.

[0069] When the line side of the outgoing cabinet or incoming cabinet of the ring network switch cabinet needs to be repaired, when the first grounding switch 6 and the second grounding switch 7 are both open, regardless of whether the first circuit breaker 2 and the second circuit breaker 5 are closed, the closing lockout circuit where the first circuit breaker 2 is located and the closing lockout circuit where the second circuit breaker 5 is located can be disconnected. Therefore, when the relevant operators repair the line side of the outgoing cabinet or the incoming cabinet, the line side grounding switch can be prevented from sending power by mistake when closing. Compared with the temporary grounding maintenance method in the related technology, the maintenance time can be reduced, thereby improving the maintenance efficiency. At the same time, the situation of wrong power transmission can be avoided, thereby improving the safety of the maintenance equipment and the relevant operators.

[0070] In a possible manner, the control unit 3 is used to control the closing lockout circuit where the first circuit breaker 2 is located to be in an open state, and / or control the closing lockout circuit where the second circuit breaker 5 is located to be in an open state when the first opening signal of the first grounding switch 6 and the second opening signal of the second grounding switch 7 are not received at the same time.

[0071] It should be understood that when the closing lockout circuit where the first circuit breaker 2 is located and the closing lockout circuit where the second circuit breaker 5 is located are controlled by the control unit 3, when the first opening signal of the first grounding switch 6 and the second opening signal of the second grounding switch 7 are not received at the same time, the closing lockout circuit where the first circuit breaker 2 is located can be controlled to be in an open state, and / or the closing lockout circuit where the second circuit breaker 5 is located can be controlled to be in an open state.

[0072] When the control unit 3 does not simultaneously receive the first opening signal of the first grounding switch 6 and the second opening signal of the second grounding switch 7, the closing lock circuit of the first circuit breaker 2 is controlled to be in an open state, which can effectively prevent the first circuit breaker 2 from sending the primary power supply from the outgoing cabinet to the incoming cabinet after the first circuit breaker 2 is closed when the first grounding switch 6 or the second grounding switch 7 is closed, causing a ground short circuit. When the control unit 3 does not simultaneously receive the first opening signal of the first grounding switch 6 and the second opening signal of the second grounding switch 7, the closing lock circuit of the second circuit breaker 5 is controlled to be in an open state, which can effectively prevent the first circuit breaker 5 from sending the primary power supply from the incoming cabinet to the outgoing cabinet after the second circuit breaker 5 is closed when the first grounding switch 6 or the second grounding switch 7 is closed, causing a ground short circuit.

[0073] In a possible manner, the control unit 3 includes a first opening switch of the first grounding switch 6 and a second opening switch of the second grounding switch 7, the first opening switch and the second opening switch are connected in series in a closing lockout circuit where the first circuit breaker 2 is located, and / or,

[0074] The control unit 3 comprises a third opening switch of the first grounding switch 6 and a fourth opening switch of the second grounding switch 7 . The third opening switch and the fourth opening switch are connected in series in a closing locking circuit where the second circuit breaker 5 is located.

[0075] It should be understood that the first grounding switch 6 may include a plurality of opening switches, and the second grounding switch 7 may include a plurality of opening switches. When the opening switch in the first grounding switch 6 is closed, a first opening signal may be generated, and when the opening switch in the second grounding switch 7 is closed, a second opening signal may be generated. In the closing lockout circuit where different circuit breakers are located in this embodiment, the opening switches connected in series may be different.

[0076] In the closing lockout circuit where the first circuit breaker 2 is located, the first opening switch and the second opening switch can be connected in series to the closing lockout circuit, so that the closing lockout circuit where the first circuit breaker 2 is located can be turned on only when the first opening switch and the second opening switch are both in the closed state. When the first opening switch is closed, it can represent that the first grounding switch 6 is in the open state. When the second opening switch is closed, it can represent that the second grounding switch 7 is in the open state.

[0077] In the closing lockout circuit where the second circuit breaker 5 is located, the third opening switch and the fourth opening switch can be connected in series to the closing lockout circuit, so that the closing lockout circuit where the second circuit breaker 5 is located can be turned on only when the third opening switch and the fourth opening switch are both in the closed state. When the third opening switch is closed, it can represent that the first grounding switch 6 is in the open state. When the fourth opening switch is closed, it can represent that the second grounding switch 7 is in the open state.

[0078] In practical applications, such as Figure 2 As shown, in Figure 2 In the figure, QF1 can be the first circuit breaker 2, QF2 can be the second circuit breaker 5, QE1 can be the first grounding switch 6, QE2 can be the second grounding switch 7, A-H4 can be the outgoing cabinet of the ring network switch cabinet, B-H1 can be the incoming cabinet of the ring network switch cabinet, and the dotted line can represent the control cable, but it is not a specific connection line. Among them, A-H4 and B-H1 can be adjacent cabinets. The cable can simultaneously connect the opening auxiliary contact of QE1 in A-H4 and the opening auxiliary contact of QE2 in the adjacent station B-H1 into the closing lock circuit of QF1 in A-H4, which can ensure that QF1 is allowed to close only when QE1 and QE2 are in the opening state at the same time, effectively preventing the situation that QF1 closes and sends the primary power from A-H4 to B-H1 when QE1 or QE2 is closed, causing a ground short circuit. Similarly, the opening contacts of QE1 and QE2 can be connected in series to the closing circuit of QF2 in B-H1 at the same time, which can effectively prevent the situation where QF2 is closed and the primary power is sent from B-H1 to A-H4 when QE1 or QE2 is closed, causing a ground short circuit.

[0079] In a possible manner, the first circuit breaker 2 includes a first electromagnet and a first working position switch, a first contact of a second opening switch is connected to the first electromagnet through the first working position switch, a second contact of the second opening switch is connected to a third contact of the first opening switch, a fourth contact of the first opening switch is connected to the outlet cabinet, and / or,

[0080] The second circuit breaker 5 includes a second electromagnet and a second working position switch, the fifth contact of the third opening switch is connected to the second electromagnet through the second working position switch, the sixth contact of the third opening switch is connected to the seventh contact of the fourth opening switch, and the eighth contact of the fourth opening switch is connected to the incoming line cabinet.

[0081] It should be understood that the first electromagnet can be used to control the closing lock circuit of the first circuit breaker 2 to be in the on state when it is powered on. The first working position switch can be used to allow current to pass when the first circuit breaker 2 is in the closed state. The second electromagnet can be used to control the closing lock circuit of the second circuit breaker 5 to be in the on state when it is powered on. The second working position switch can be used to allow current to pass when the second circuit breaker 5 is in the closed state.

[0082] In specific applications, such as Figure 3 As shown, BT1 can be the first working position switch, and RL1 can be the first electromagnet. When BT1 in QF1 is turned on, the primary circuit is connected, and the third contact and the fourth contact of the first opening switch in QE1 and the first contact and the fourth contact of the second opening switch in QE2 are connected in series to the closing lock RL1 power supply circuit of QF1. When the first opening switch and the second opening switch are closed at the same time, their first contact, second contact, third contact and fourth contact are turned on, and RL1 is energized to unlock the closing lock condition of QF1. At this time, when QF1 receives the closing command issued locally or from the background and other closing permission conditions are met, QF1 executes the closing action. When any of the first opening switch and the second opening switch is in the opening state, that is, when the ring network cable is grounded, RL1 cannot be powered to unlock the closing lock condition of QF1. Even if QF1 receives a closing command, it cannot perform the closing action, thereby avoiding the situation where QF1 is mistakenly closed when any of the first grounding switch 6 and the second grounding switch 7 is in the closing state. BT2 can be a test position switch of the circuit breaker, which is used to disconnect the circuit breaker for maintenance. BT2 can be connected to RL1 to form a loop. DK1 can be a switch connected to the outgoing cabinet, and DK2 can be a switch connected to the incoming cabinet.

[0083] like Figure 4As shown, BT3 can be the second working position switch, and RL2 can be the second electromagnet. When BT3 in QF2 is turned on, the primary circuit is connected, and the fifth contact and the sixth contact of the third opening switch in QE1 and the seventh contact and the eighth contact of the fourth opening switch in QE2 are connected in series to the closing lock RL2 power supply circuit of QF2. When the third opening switch and the fourth opening switch are closed at the same time, their fifth contact, the sixth contact, the seventh contact and the eighth contact are turned on, and RL2 is energized to unlock the closing lock condition of QF2. At this time, when QF2 receives the closing command issued locally or from the background and other closing permission conditions are met, QF2 executes the closing action. When any of the third opening switch and the fourth opening switch is in the opening state, that is, when the ring network cable is grounded, RL2 cannot be powered to unlock the closing lock condition of QF2. Even if QF2 receives the closing command, it cannot perform the closing action, thereby avoiding the situation where QF1 is mistakenly closed when any of the first grounding switch 6 and the second grounding switch 7 is in the closing state. BT4 can be a test position switch of the circuit breaker, which is used to disconnect the circuit breaker for maintenance. BT4 can be connected to RL2 to form a loop. DK4 can be a switch connected to the outgoing cabinet, and DK3 can be a switch connected to the incoming cabinet.

[0084] By connecting the first opening switch in the first grounding switch 6 and the second opening switch in the second grounding switch 7 in series to the closing lockout circuit where the first circuit breaker 2 is located, and connecting the third opening switch in the first grounding switch 6 and the fourth opening switch in the second grounding switch 7 in series to the closing lockout circuit where the second circuit breaker 5 is located, the electrical lockout between the circuit breaker and the grounding switch can be realized by only relying on cables without adding new equipment, effectively avoiding the wrong power supply when the line-side grounding switch is closed, improving the maintenance efficiency, and the solution is simple and highly executable.

[0085] In a possible manner, the control unit 3 includes a first protection device, a second protection device, a first opening switch of the first grounding switch 6 and a second opening switch of the second grounding switch 7;

[0086] The input end of the first protection device is connected to the opening contact of the first earthing switch 6, the output end of the first protection device is connected to the first circuit breaker 2, the input end of the second protection device is connected to the opening contact of the second earthing switch 7, the output end of the second protection device is connected to the second circuit breaker 5, and the first protection device and the second protection device are connected via a single-mode optical cable;

[0087] The first protection device is used to control the closing lock circuit where the first circuit breaker 2 is located to be in an open state when the first opening signal of the first grounding switch 6 and the second opening signal transmitted by the second protection device are not received at the same time;

[0088] The second protection device is used to control the closing lock circuit where the second circuit breaker 5 is located to be in an open state when the second opening signal of the second grounding switch 7 and the first opening signal transmitted by the first protection device are not received at the same time.

[0089] It should be understood that the first protection device and the second protection device are both protection devices in the ring network switch cabinet. The first protection device and the second protection device can be used to monitor parameters in various systems in the ring network switch cabinet, and take measures to protect the components of the system and equipment when abnormal conditions are detected.

[0090] The single-mode optical cable can be used to transmit the first trip signal transmitted in the first protection device to the second protection device, and to transmit the second trip signal transmitted in the second protection device to the first protection device. The single-mode optical cable can be a GOOSE (Generic Object-Oriented Substation Event) channel, which is not specifically limited in this embodiment.

[0091] The first protection device can be used to receive the first opening signal and the second opening signal transmitted from the second protection device, and only when the first opening signal and the second opening signal are received at the same time, the closing lock circuit where the first circuit breaker 2 is located is controlled to be in a closed state. In other words, when the first opening signal or the second opening signal is not received, the closing lock circuit where the first circuit breaker 2 is located is controlled to be in an open state.

[0092] The second protection device can be used to receive the second opening signal and the first opening signal transmitted from the first protection device, and only when the first opening signal and the second opening signal are received at the same time, the closing lock circuit where the second circuit breaker 5 is located is controlled to be in a closed state. In other words, when the first opening signal or the second opening signal is not received, the closing lock circuit where the second circuit breaker 5 is located is controlled to be in an open state.

[0093] like Figure 5As shown, BH1 can be the first protection device, and BH2 can be the second protection device. The first opening signal of QE1 can be connected to BH1 through a cable as a remote signal point of BH1, and at the same time, the second opening signal of QE2 can be connected to BH2 through a cable as a remote signal point of BH2. Afterwards, the information between BH1 and BH2 can be exchanged through the inter-station GOOSE channel composed of the process layer optical port between BH1 and BH2 and the inter-station single-mode optical cable, and the first opening signal of QE1 and the second opening signal of QE2 can be shared. The first opening signal of QE1 and the second opening signal of QE2 can be used as a necessary condition for the closing permission of QF1 and QF2, which can ensure that only when the first opening signal of QE1 and the second opening signal of QE2 are received at the same time, the closing permission contacts of BH1 and BH2 can be turned on, and QF1 and QF2 can be closed, effectively preventing the occurrence of closing grounding short circuit.

[0094] By connecting the first protection device and the second protection device, and when both the first protection device and the second protection device do not receive the first opening signal and the second opening signal at the same time, the closing lockout circuit of the corresponding circuit breaker is controlled to be in an open state, thereby preventing the occurrence of a closing grounding short circuit, and avoiding the occurrence of a wrong power supply of the line-side grounding switch when closing. Compared with the temporary grounding maintenance method in the related art, the maintenance time can be reduced, thereby improving the maintenance efficiency. At the same time, the occurrence of wrong power supply can be avoided, thereby improving the safety of the maintenance equipment and related operators.

[0095] In a possible manner, the first protection device includes a first board, a second board and a first logic controller, the input end of the first board is connected to the opening contact of the first grounding switch 6, the input end of the second board is connected to the output end of the second protection device, and the output end of the first board and the output end of the second board are both connected to the first logic controller;

[0096] The first board is used to receive the first opening signal of the first grounding switch 6, and transmit the first opening signal to the first logic controller;

[0097] The second board is used to receive the second opening signal transmitted by the second protection device, and transmit the second opening signal to the first logic controller;

[0098] The first logic controller is used to control the closing lock circuit where the first circuit breaker 2 is located to be in an open state when the first opening signal and the second opening signal are not received at the same time.

[0099] It should be understood that in the first protection device, a first board for receiving a first opening signal and a second board for receiving a second opening signal transmitted by a second protection device can be provided. When the opening contact of the first grounding switch 6 is closed, the generated first opening signal can be transmitted to the first board, and the first opening signal is transmitted to the first logic controller. The second board is used to receive the second opening signal transmitted by the second protection device, and transmit the second opening signal to the first logic controller. Among them, the first board can be a DIO for digital signal input and output. The second board can be a communication board.

[0100] The first logic controller may be a device for automatic control. When the first logic controller does not receive the first opening signal and the second opening signal at the same time, the closing lock circuit where the first circuit breaker 2 is located may be controlled to be in an open state. The first logic controller may be a programmable logic controller, and may determine whether the first opening signal and the second opening signal are received at the same time through a logic operation stored in the relevant technology, and the embodiments of the present disclosure do not make specific limitations on this.

[0101] like Figure 6 As shown, in the first protection device, the X3 (DIO) board can be the first board, wherein the communication input 3, communication input 4, communication input 7, communication input 10 and communication input 11 are all used for receiving the remote signal point of the signal. Then, the first opening signal can be received through the remote signal input 11. X4 (COM) can be the second board, wherein TX can be the port for sending the signal, and RX can be the port for receiving the signal. Then, the second opening signal transmitted by the second protection device can be received through ETH: R1.

[0102] In a possible manner, the first protection device further comprises a first switch, the first switch is connected to the first logic controller, and the first switch is connected in series in a closing lockout circuit of the first circuit breaker 2;

[0103] The first logic controller is used to control the first switch to be in an open state when the second opening signal and the first opening signal are not received simultaneously, so that the closing lock circuit where the first circuit breaker 2 is located is in an open state.

[0104] It should be understood that a first switch can also be provided in the first protection device, and the first switch is connected in series in the closing lockout circuit where the first circuit breaker 2 is located. The closed state and the open state of the first switch can be controlled by the first logic controller. When the first logic controller does not receive the first opening signal and the second opening signal at the same time, the first switch can be controlled to be in an open state, and then the closing lockout circuit where the first circuit breaker 2 is located is in an open state regardless of whether the first circuit breaker 2 is closed or opened. It can then be ensured that the first opening signal and the second opening signal are two necessary conditions for closing in the closing lockout circuit where the first circuit breaker 2 is located, and it can be ensured that the closing lockout circuit where the first circuit breaker 2 is located can be turned on only when the first opening signal and the second opening signal are received.

[0105] like Figure 7 As shown, MC1 is an electromagnetic coil in the first circuit breaker 2. When the first protection device does not receive the first opening signal and the second opening signal, it can control the open nodes BH1:3:a12 and BH1:3:c12 of the first switch to be disconnected, and then the electromagnetic coil MC1 is disconnected through the circuit connected between the 2:a18 node and the 2:c18 node, and then no matter whether the first circuit breaker 2 is in a closed state or an open state, the closing lock circuit where the first circuit breaker 2 is located is in a disconnected state, and then the line side where the first circuit breaker 2 is located can be repaired, which can improve the safety of the maintenance equipment and related operators. When the first protection device receives the first opening signal and the second opening signal at the same time, it can control the open nodes BH1:3:a12 and BH1:3:c12 of the first switch to be closed and turned on, and then the electromagnetic coil MC1 is turned on through the circuit connected between the 2:a18 node and the 2:c18 node, and the closing lock circuit where the first circuit breaker 2 is located can only be turned on when the first circuit breaker 2 is in a closed state.

[0106] like Figure 8 As shown, when controlling whether the first switch is closed, in addition to controlling the state of the first switch upon receiving the first opening signal and the second opening signal, the protection device can also be used to determine whether the circuit is disconnected, the circuit is disconnected, the spring in the first protection device has no energy storage, the first circuit breaker is in position 2, the first working position switch signal and the first test position switch signal are greater than or equal to 1, the bus voltage UA, UB, UC, the bus is pressure-free, the bus PT circuit MCB is closed, and the high-voltage belt display is locked. The control methods all adopt the control methods in the protection device provided in the ring network switch cabinet in the related technology, and the embodiments of the present disclosure do not make specific limitations on this.

[0107] In a possible manner, the second protection device includes a third board, a fourth board and a second logic controller, the input end of the third board is connected to the opening contact of the second grounding switch 7, the input end of the fourth board is connected to the output end of the first protection device, and the output end of the third board and the output end of the fourth board are both connected to the second logic controller;

[0108] The third board is used to receive the second opening signal and transmit the second opening signal to the second logic controller;

[0109] The fourth board is used to receive the first opening signal transmitted by the first protection device, and transmit the first opening signal to the second logic controller;

[0110] The second logic controller is used to control the closing lock circuit where the second circuit breaker 5 is located to be in an open state when the second opening signal and the first opening signal are not received at the same time.

[0111] It should be understood that in the second protection device, a third board for receiving the second opening signal and a fourth board for receiving the first opening signal transmitted by the first protection device can be provided. When the opening contact of the second grounding switch 7 is closed, the generated second opening signal can be transmitted to the third board, and the second opening signal is transmitted to the second logic controller. The fourth board is used to receive the first opening signal transmitted by the first protection device, and transmit the first opening signal to the second logic controller. Among them, the third board can be a DIO for digital signal input and output. The fourth board can be a communication board.

[0112] The second logic controller may be a device for automatic control. When the second logic controller does not receive the first opening signal and the second opening signal at the same time, the closing lock circuit where the second circuit breaker 5 is located may be controlled to be in an open state. The second logic controller may be a programmable logic controller, and may determine whether the first opening signal and the second opening signal are received at the same time through a logic operation stored in the relevant technology, and the embodiments of the present disclosure do not make specific limitations on this.

[0113] like Figure 6 As shown, in the second protection device, the X1 (DIO) board can be the third board, wherein communication input 3, communication input 4, communication input 7, communication input 10 and communication input 11 are all used for receiving the remote signal point of the signal. The first opening signal can be received through the remote signal input 11. X2 (COM) can be the fourth board, TX can be the port for sending signals, and RX can be the port for receiving signals. The first opening signal transmitted by the first protection device can be received through ETH: R2.

[0114] In a possible manner, the second protection device further comprises a second switch, the second switch is connected to the second logic controller, and the second switch is connected in series in the closing lockout circuit of the second circuit breaker 5;

[0115] The second logic controller is used to control the second switch to be in an open state when the second opening signal and the first opening signal are not received at the same time, so that the closing lock circuit where the second circuit breaker 5 is located is in an open state.

[0116] It should be understood that a second switch can also be provided in the second protection device, and the second switch is connected in series in the closing lockout circuit where the second circuit breaker 5 is located. The closed state and the open state of the second switch can be controlled by the second logic controller. When the second logic controller does not receive the first opening signal and the second opening signal at the same time, the second switch can be controlled to be in the open state, and then the closing lockout circuit where the second circuit breaker 5 is located is in the open state regardless of whether the second circuit breaker 5 is closed or opened. It can then be ensured that the first opening signal and the second opening signal are two necessary conditions for closing in the closing lockout circuit where the second circuit breaker 5 is located, and it can be ensured that the closing lockout circuit where the second circuit breaker 5 is located can be turned on only when the first opening signal and the second opening signal are received.

[0117] like Fig. 9 As shown, MC2 is an electromagnetic coil in the second circuit breaker 5. When the second protection device does not receive the first opening signal and the second opening signal, it can control the open nodes BH2:3:a12 and BH2:3:c12 of the second switch to be disconnected, and then the circuit connected by the electromagnetic coil MC2 through the 2:a18 node and the 2:c18 node is disconnected. Regardless of whether the second circuit breaker 5 is in a closed state or an open state, the closing lock circuit where the second circuit breaker 5 is located is in a disconnected state, and then the line side where the second circuit breaker 5 is located can be repaired, which can improve the safety of the maintenance equipment and related operators. When the second protection device receives the first opening signal and the second opening signal at the same time, it can control the open nodes BH2:3:a12 and BH2:3:c12 of the second switch to be closed and turned on, and then the circuit connected by the electromagnetic coil MC2 through the 2:a18 node and the 2:c18 node is turned on, and then the closing lock circuit where the second circuit breaker 5 is located can be turned on only when the second circuit breaker 5 is in a closed state.

[0118] like Figure 6As shown, the opening and closing auxiliary contacts of QE1 and QE2 can be connected to BH1 and BH2 as remote signal signals, and then the GOOSE channels of the process layers of BH1 and BH2 can be used to exchange information between different protection devices, and the opening and closing status information of the grounding switch on the opposite side can be shared. And the received opening signal of the grounding switch on the opposite side and the opening signal of the grounding switch in this cabinet can be used as two necessary conditions for the closing permission of the circuit breaker in this cabinet, ensuring that the closing permission contact of the circuit breaker can only be turned on when QE1 and QE2 are opened at the same time. The closing permission contact of the protection device can be connected in series in the closing circuit of the circuit breaker, and the closing coil MC of the circuit breaker can be energized to execute the closing command when QE1 and QE2 are opened at the same time, effectively preventing the possibility of human error in power transmission when the line side is grounded, and ensuring the personal safety of equipment and operators.

[0119] By using the first protection device and the second protection device to control the state of the closing locking circuit of the circuit breaker, it is possible to establish a GOOSE channel for a pair of ring network inlet and outlet cabinets between stations by using the existing protection devices and the spare core of the optical differential jumper cable between stations without adding new equipment, and to obtain the real-time state of the interactive grounding switch. The electrical locking between the circuit breaker and the grounding switch can be achieved through the closing permission logic of the circuit breaker. The solution is reliable and highly feasible.

[0120] In a possible embodiment, the control unit 3 is used to:

[0121] After receiving the first grounding signal of the first grounding switch 6, the closing lock circuit of the first circuit breaker 2 is controlled to be in an open state, and / or,

[0122] After receiving the second grounding signal of the second grounding switch 7 , the closing lock circuit where the second circuit breaker 5 is located is controlled to be in an open state.

[0123] It should be understood that, in addition to controlling the corresponding closing lockout circuit when the control unit 3 does not simultaneously receive the first opening signal of the first grounding switch 6 and the second opening signal of the second grounding switch 7, it can also control the closing lockout circuit where the first circuit breaker 2 is located to be in an open state according to the received first grounding signal of the first grounding switch 6, and / or control the closing lockout circuit where the second circuit breaker 5 is located to be in an open state after receiving the second grounding signal of the second grounding switch 7.

[0124] By receiving the first grounding signal to control the closing lockout circuit where the first circuit breaker 2 is located, and receiving the second grounding signal to control the closing lockout circuit where the second circuit breaker 5 is located, the occurrence of grounding faults caused by human error operations can be avoided.

[0125] In a possible manner, the control circuit further includes a first detector, a third switch, a second detector and a fourth switch, and the control unit 3 includes a first controller and a second controller;

[0126] The input end of the first controller is connected to the first detector, the output end of the first controller is connected to the third switch, and the third switch is connected in series in the closing circuit where the first circuit breaker 2 is located; the input end of the second controller is connected to the second detector, the output end of the second controller is connected to the fourth switch, and the fourth switch is connected in series in the closing circuit where the second circuit breaker 5 is located;

[0127] The first detector is used to detect the first ground signal and transmit the first ground signal to the first controller;

[0128] The first controller is used to control the third switch to be in an open state after receiving the first grounding signal, so that the closing lock circuit where the first circuit breaker 2 is located is in an open state;

[0129] The second detector is used to detect the second ground signal and transmit the second ground signal to the second controller;

[0130] The second controller is used to control the fourth switch to be in an open state after receiving the second grounding signal, so that the closing lock circuit where the second circuit breaker 5 is located is in an open state.

[0131] It should be understood that the first detector can be used to detect the first grounding signal in the first grounding switch 6, and the second detector can be used to detect the second grounding signal in the second grounding switch 7. The first detector and the second detector can both be resistance testers, voltage testers, and current testers, which are not specifically limited in the embodiments of the present disclosure.

[0132] The first controller can be used to control the third switch to be in an open state after receiving the first grounding signal. At this time, no matter what state the first circuit breaker 2 is in, the closing lock circuit where the first circuit breaker 2 is located is in an open state. The second controller can be used to control the fourth switch to be in an open state after receiving the second grounding signal. At this time, no matter what state the second circuit breaker 5 is in, the closing lock circuit where the second circuit breaker 5 is located is in an open state.

[0133] like Fig.10As shown, the first detector and the second detector can be used to detect whether the inter-station ring network cable is grounded due to the closing of the grounding switch online in real time, output the ring network cable grounding signal, and then string the grounding signal into the closing circuit of QF1 or QF2. It can ensure that QF1 or QF2 can be closed only if the ring network cable is not grounded, avoiding the occurrence of grounding faults caused by human error.

[0134] In practical applications, such as Fig.11 As shown, in A-H4, the first detector can be connected to the A phase, B phase, C phase, and grounding bar of the primary cable through four 1.0mm2 single-core shielded cables, and the primary cable can be detected in real time to see if it is connected to the system ground, and the information is uploaded to the first controller. When the first detector is operating normally, the primary cable is connected to the ground, and the first controller can control the third switch to be disconnected after receiving the first grounding signal. Fig.12 As shown, the normally closed auxiliary contacts ZJ:11 / ZJ:12 of the third switch are connected in series in the closing lock circuit of the first circuit breaker 2. When the inter-station cable is connected to the ground, the normally closed auxiliary contacts ZJ:11 / ZJ:12 of the third switch are disconnected, the closing lock circuit where the first circuit breaker 2 is located is disconnected, and the first circuit breaker 2 cannot be closed after receiving the closing command. When the inter-station cable is insulated from the ground, the normally closed auxiliary contacts ZJ:11 / ZJ:12 of the third switch do not act and remain in a closed state. After the first circuit breaker 2 receives the closing command, the closing is successful. The second circuit breaker 5 is controlled in the same way as the first circuit breaker 2, which will not be repeated here.

[0135] By setting up detectors and controllers to control the closing interlocking circuit where the circuit breaker is located, it is possible to avoid incorrect power supply when the line-side grounding switch is closed, thereby improving maintenance efficiency.

[0136] Based on the same concept, this embodiment also discloses a ring network switch cabinet 1301, including the control circuit 1302 disclosed in this embodiment.

[0137] Fig.13 FIG. 1 is a block diagram showing a ring network switch cabinet 1301 according to an exemplary embodiment. Fig.13 As shown, the ring network switch cabinet 1301 is provided with a control circuit 1302 provided in this embodiment.

[0138] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0139] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0140] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A control circuit, characterized in that: Applicable to a ring network switch cabinet, comprising a control unit (3), a first circuit breaker (2) of an outgoing cabinet, a first grounding switch (6) of the outgoing cabinet, a second circuit breaker (5) of an incoming cabinet, and a second grounding switch (7) of the incoming cabinet; The first circuit breaker (2) is respectively connected to the first grounding switch (6) and the output end (1) of the outgoing line cabinet, and the second circuit breaker (5) is respectively connected to the second grounding switch (7) and the input end (4) of the incoming line cabinet; The control unit (3) is used to control the closing lock circuit of the first circuit breaker (2) to be in an open state, and / or control the closing lock circuit of the second circuit breaker (5) to be in an open state through the first grounding switch (6) and the second grounding switch (7).

2. The control circuit according to claim 1, characterized in that: The control unit (3) is used to control the closing lock circuit of the first circuit breaker (2) to be in an open state, and / or control the closing lock circuit of the second circuit breaker (5) to be in an open state when the first opening signal of the first grounding switch (6) and the second opening signal of the second grounding switch (7) are not received simultaneously.

3. The control circuit according to claim 2, characterized in that: The control unit (3) comprises a first opening switch of the first grounding switch (6) and a second opening switch of the second grounding switch (7), the first opening switch and the second opening switch being connected in series in a closing lockout circuit where the first circuit breaker (2) is located, and / or, The control unit (3) comprises a third opening switch of the first grounding switch (6) and a fourth opening switch of the second grounding switch (7), and the third opening switch and the fourth opening switch are connected in series in a closing lockout circuit where the second circuit breaker (5) is located.

4. The control circuit according to claim 3, characterized in that: The first circuit breaker (2) comprises a first electromagnet and a first working position switch, a first contact of a second opening switch is connected to the first electromagnet via the first working position switch, a second contact of the second opening switch is connected to a third contact of the first opening switch, a fourth contact of the first opening switch is connected to the outlet cabinet, and / or, The second circuit breaker (5) comprises a second electromagnet and a second working position switch, the fifth contact of the third opening switch is connected to the second electromagnet via the second working position switch, the sixth contact of the third opening switch is connected to the seventh contact of the fourth opening switch, and the eighth contact of the fourth opening switch is connected to the incoming line cabinet.

5. The control circuit according to claim 2, characterized in that: The control unit (3) comprises a first protection device, a second protection device, a first opening switch of the first grounding switch (6) and a second opening switch of the second grounding switch (7); The input end of the first protection device is connected to the opening contact of the first earthing switch (6), the output end of the first protection device is connected to the first circuit breaker (2), the input end of the second protection device is connected to the opening contact of the second earthing switch (7), the output end of the second protection device is connected to the second circuit breaker (5), and the first protection device and the second protection device are connected via a single-mode optical cable; The first protection device is used to control the closing lock circuit of the first circuit breaker (2) to be in an open state when the first opening signal of the first grounding switch (6) and the second opening signal transmitted by the second protection device are not received simultaneously; The second protection device is used to control the closing lock circuit of the second circuit breaker (5) to be in an open state when the second opening signal of the second grounding switch (7) and the first opening signal transmitted by the first protection device are not received at the same time.

6. The control circuit according to claim 5, characterized in that: The first protection device comprises a first board, a second board and a first logic controller, the input end of the first board is connected to the opening contact of the first grounding switch (6), the input end of the second board is connected to the output end of the second protection device, and the output end of the first board and the output end of the second board are both connected to the first logic controller; The first board is used to receive the first opening signal of the first grounding switch (6) and transmit the first opening signal to the first logic controller; The second board is used to receive the second opening signal transmitted by the second protection device, and transmit the second opening signal to the first logic controller; The first logic controller is used to control the closing lock circuit where the first circuit breaker (2) is located to be in an open state when the first opening signal and the second opening signal are not received simultaneously.

7. The control circuit according to claim 6, characterized in that: The first protection device further comprises a first switch, the first switch is connected to the first logic controller, and the first switch is connected in series in a closing and locking circuit of the first circuit breaker (2); The first logic controller is used to control the first switch to be in an open state when the second opening signal and the first opening signal are not received simultaneously, so that the closing lock circuit where the first circuit breaker (2) is located is in an open state.

8. The control circuit according to claim 5, characterized in that: The second protection device comprises a third board, a fourth board and a second logic controller, the input end of the third board is connected to the opening contact of the second grounding switch (7), the input end of the fourth board is connected to the output end of the first protection device, and the output end of the third board and the output end of the fourth board are both connected to the second logic controller; The third board is used to receive the second opening signal and transmit the second opening signal to the second logic controller; The fourth board is used to receive the first opening signal transmitted by the first protection device, and transmit the first opening signal to the second logic controller; The second logic controller is used to control the closing lock circuit where the second circuit breaker (5) is located to be in an open state when the second opening signal and the first opening signal are not received simultaneously.

9. The control circuit according to claim 8, characterized in that: The second protection device further comprises a second switch, the second switch is connected to the second logic controller, and the second switch is connected in series in the closing and locking circuit of the second circuit breaker (5); The second logic controller is used to control the second switch to be in an open state when the second opening signal and the first opening signal are not received simultaneously, so that the closing lock circuit where the second circuit breaker (5) is located is in an open state.

10. The control circuit according to claim 1, characterized in that: The control unit (3) is used for: After receiving the first grounding signal from the first grounding switch (6), the closing lock circuit of the first circuit breaker (2) is controlled to be in an open state, and / or, After receiving the second grounding signal from the second grounding switch (7), the closing lock circuit where the second circuit breaker (5) is located is controlled to be in an open state.

11. The control circuit according to claim 10, characterized in that: The control circuit further comprises a first detector, a third switch, a second detector and a fourth switch, and the control unit (3) comprises a first controller and a second controller; The input end of the first controller is connected to the first detector, the output end of the first controller is connected to the third switch, and the third switch is connected in series in the closing circuit where the first circuit breaker (2) is located; the input end of the second controller is connected to the second detector, the output end of the second controller is connected to the fourth switch, and the fourth switch is connected in series in the closing circuit where the second circuit breaker (5) is located; The first detector is used to detect the first ground signal and transmit the first ground signal to the first controller; The first controller is used to control the third switch to be in an open state after receiving the first grounding signal, so that the closing lock circuit where the first circuit breaker (2) is located is in an open state; The second detector is used to detect the second ground signal and transmit the second ground signal to the second controller; The second controller is used to control the fourth switch to be in an open state after receiving the second grounding signal, so that the closing lock circuit where the second circuit breaker (5) is located is in an open state.

12. A ring network switch cabinet, characterized in that: The control circuit comprises the control circuit according to any one of claims 1 to 11.

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