Electrical switch cabinet intelligent interlocking control loop based on multi-state cooperative determination

Abstract

An electrical switch cabinet intelligent interlocking control loop based on multi-state cooperative determination is characterized in that the topological arrangement of the interlocking control loop is as follows: an incoming cabinet V1, an incoming cabinet V2, a contact cabinet VL, an incoming cabinet V3 and an incoming cabinet V4, an I-section bus is the incoming cabinet V1, the incoming cabinet V2 and the incoming cabinet V3, and an II-section bus is the incoming cabinet V3 and the incoming cabinet V4. The closing condition of each wire inlet cabinet is controlled as follows: under the condition that a contact cabinet VL is opened, only one wire inlet cabinet is required to supply power to a bus on each side; under the condition that the contact cabinet VL is switched on, only one incoming cabinet is required to supply power to buses on the two sides. According to the invention, topology adaptive reconstruction, multi-source cooperative control, energy efficiency optimization contribution and operation and maintenance intelligentization are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switchgear distribution equipment, and particularly to an interlock control circuit for an electrical switchgear. Background Art

[0002] With the in-depth promotion of the digital transformation of China's power industry, environmentally friendly gas-insulated switchgear with a compact structure design, intelligent operation and maintenance characteristics, and low-carbon environmental protection advantages has become the core equipment for the upgrade and transformation of modern distribution networks. Such equipment plays an important role in key scenarios such as smart city distribution network projects, industrial park microgrid systems, rail transit power supply networks, and data center power hubs. Its operation reliability directly affects the power supply quality and fault self-healing ability of the smart grid.

[0003] The switchgear assembly includes three core modules: an incoming line cabinet, a tie cabinet, and an outgoing line cabinet. Among them, the incoming line cabinet undertakes the function of accessing high-voltage electric energy, the tie cabinet realizes the topological interconnection and operation mode switching between multiple bus systems, and the outgoing line cabinet completes the directional transmission of electric energy and load matching. In order to highlight the core control logic and facilitate description, the load-side outgoing line cabinet configured in the engineering example is hidden in the system architecture schematic.

[0004] Aiming at the control bottlenecks of existing switchgear equipment in complex networking modes, especially the problems of insufficient topological adaptability and lack of multi-source collaborative control in the networking operation of multi-node switchgear, the present invention focuses on solving the compatibility defects of traditional mechanical interlock systems in multi-source and dual-source switch - single-source radiation hybrid power supply modes. By deeply integrating the intelligent interlock control technology of electrical switchgear, multi-modal state identification, and edge computing control architecture, an intelligent interlock control circuit with topological self-adaptive characteristics is constructed, which can effectively meet the core requirements of the new power system for flexible reconfiguration of the distribution network framework, flexible access of distributed power sources, and improvement of power supply reliability. Summary of the Invention

[0005] In order to overcome the deficiencies of the existing switchgear power distribution system, such as poor flexibility in topological reconfiguration and lack of multi-source dynamic coordination mechanism, the present invention proposes an intelligent interlock control circuit for an electrical switchgear based on multi-state collaborative determination, realizing topological self-adaptive reconfiguration, multi-source collaborative control, energy efficiency optimization contribution, and intelligent operation and maintenance.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] An intelligent interlock control circuit for an electrical switchgear based on multi-state collaborative determination. The topological arrangement of the interlock control circuit is as follows: incoming line cabinet V1 - incoming line cabinet V2 - tie cabinet VL - incoming line cabinet V3 - incoming line cabinet V4. Bus section I is between incoming line cabinet V1 and incoming line cabinet V2, and bus section II is between incoming line cabinet V3 and incoming line cabinet V4. Under the opening and closing states of the tie cabinet VL, the following controls are made for the closing conditions of each incoming line cabinet: When the tie cabinet VL is in the open state, it is required that only one incoming line cabinet supplies power to each side of the bus; when the tie cabinet VL is in the closed state, it is required that only one incoming line cabinet supplies power to both sides of the bus.

[0008] Further, the incoming line cabinet V1 is provided with normally open and normally closed contacts of the auxiliary switch QF1 of the circuit breaker, the incoming line cabinet V2 is provided with normally open and normally closed contacts of the auxiliary switch QF2 of the circuit breaker, the tie cabinet VL is provided with normally open and normally closed contacts of the auxiliary switch QFL of the circuit breaker, the incoming line cabinet V3 is provided with normally open and normally closed contacts of the auxiliary switch QF3 of the circuit breaker, and the incoming line cabinet V4 is provided with normally open and normally closed contacts of the auxiliary switch QF4 of the circuit breaker. The normally open and normally closed contacts of each auxiliary switch are interlocked. The interlock control circuit includes the closing circuit interlock circuit of incoming line cabinet V1, the closing circuit interlock circuit of incoming line cabinet V2, the closing circuit interlock circuit of incoming line cabinet V3, the closing circuit interlock circuit of incoming line cabinet V4, and the closing circuit interlock circuit of tie cabinet VL.

[0009] Still further, the closing circuit interlock circuit of incoming line cabinet V1 includes the normally closed contact of the auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4, and the normally closed contact of the auxiliary switch QFL of the circuit breaker of tie cabinet VL. The normally closed contacts of QF3 and QF4 are connected in series and then in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF2.

[0010] Even further, the closing circuit interlock circuit of incoming line cabinet V2 includes the normally closed contact of the auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4, and the normally closed contact of the auxiliary switch QFL of the circuit breaker of tie cabinet VL. The normally closed contacts of QF3 and QF4 are connected in series and then in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF1.

[0011] The interlock circuit of the closing loop of the V3 incoming line cabinet includes the normally closed contact of the auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally closed contact of the auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4, and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the tie cabinet VL. The normally closed contacts of QF1 and QF2 are connected in series and then in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF4.

[0012] The interlock circuit of the closing loop of the V4 incoming line cabinet includes the normally closed contact of the auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally closed contact of the auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3, and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the tie cabinet VL. The normally closed contacts of QF1 and QF2 are connected in series and then in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF3.

[0013] The interlock circuit of the closing loop of the VL tie cabinet includes the normally open and normally closed contacts of the auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally open and normally closed contacts of the auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally open and normally closed contacts of the auxiliary switch QFL of the circuit breaker of the tie cabinet VL, the normally open and normally closed contacts of the auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3, and the normally open and normally closed contacts of the auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4;

[0014] The normally closed contacts of QF1 and QF2 are connected in parallel, the normally open contacts of QF1 and QF2 are connected in parallel, the normally closed contacts of QF3 and QF4 are connected in series, and the above three branches are connected in series successively and named branch 1;

[0015] The normally closed contacts of QF3 and QF4 are connected in parallel, the normally open contacts of QF3 and QF4 are connected in parallel, the normally closed contacts of QF1 and QF2 are connected in series, and the above three branches are connected in series successively and named branch 2;

[0016] The two ends of branch 1 and branch 2 are connected in parallel.

[0017] The beneficial effects of the present invention are mainly manifested in: topological adaptive reconstruction, multi-source collaborative control, energy efficiency optimization contribution, and operation and maintenance intelligence. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the arrangement combination of four incoming line switch cabinets, two outgoing line cabinets and one tie cabinet. For the convenience of description, the load-side outgoing line cabinets configured in the engineering example are hidden subsequently.

[0019] Figure 2It is the electrical interlock truth table used for the electrical incoming cabinet and the electrical connection cabinet.

[0020] Figure 3 It is the off position (normally closed contacts 1-2) and on position (normally open contacts 3-4) of the auxiliary switch QF of the interlocking circuit breaker used for the electrical incoming cabinet and the electrical connection cabinet. The off position and on position of the QF contacts of the same electrical cabinet are logically in a reverse interlocking relationship.

[0021] Figure 4 It is the electrical interlock logical relationship of the electrical incoming cabinet and the electrical connection cabinet. Specific implementation mode

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Refer to Figures 1 to 4 , an intelligent interlock control circuit for an electrical switchgear based on multi-state collaborative determination. The switch distribution unit in this embodiment adopts a five-cabinet combined structure, namely incoming cabinet V1, incoming cabinet V2, connection cabinet VL, incoming cabinet V3, and incoming cabinet V4. The topological arrangement of the interlock control circuit is: incoming cabinet V1 - incoming cabinet V2 - connection cabinet VL - incoming cabinet V3 - incoming cabinet V4. The I-section busbar is incoming cabinet V1 - incoming cabinet V2 (the outgoing cabinet is omitted), and the II-section busbar is incoming cabinet V3 - incoming cabinet V4 (the outgoing cabinet is omitted).

[0024] In this embodiment, when the connection cabinet VL is tripped, it is required that only one incoming cabinet supplies power to each side of the busbar respectively. For example: if incoming cabinets V1 and V3 are closed, then incoming cabinets V2 and V4 cannot be closed; if incoming cabinets V1 and V4 are closed, then incoming cabinets V2 and V3 cannot be closed; if incoming cabinets V2 and V3 are closed, then incoming cabinets V1 and V4 cannot be closed; if incoming cabinets V2 and V4 are closed, then incoming cabinets V1 and V3 cannot be closed.

[0025] In this embodiment, when the connection cabinet VL is closed, it is required that only one incoming cabinet supplies power to both sides of the busbar, and the remaining incoming cabinets cannot be closed. For example: when incoming cabinet V1 and connection cabinet VL are closed, the remaining incoming cabinets V2, V3, and V4 cannot be closed; when incoming cabinet V2 and connection cabinet VL are closed, the remaining incoming cabinets V1, V3, and V4 cannot be closed; when incoming cabinet V3 and connection cabinet VL are closed, the remaining incoming cabinets V1, V2, and V4 cannot be closed; when incoming cabinet V4 and connection cabinet VL are closed, the remaining incoming cabinets V1, V2, and V3 cannot be closed.

[0026] Refer to Figure 3, the incoming line cabinet V1 is provided with normally open contacts (referred to as normally open points, i.e., closed position) and normally closed contacts (referred to as normally closed points, i.e., open position) of the auxiliary switch QF1 of the circuit breaker, the incoming line cabinet V2 is provided with normally open contacts (referred to as normally open points, i.e., closed position) and normally closed contacts (referred to as normally closed points, i.e., open position) of the auxiliary switch QF2 of the circuit breaker, the tie cabinet VL is provided with normally open contacts (referred to as normally open points, i.e., closed position) and normally closed contacts (referred to as normally closed points, i.e., open position) of the auxiliary switch QFL of the circuit breaker, the incoming line cabinet V3 is provided with normally open contacts (referred to as normally open points, i.e., closed position) and normally closed contacts (referred to as normally closed points, i.e., open position) of the auxiliary switch QF3 of the circuit breaker, and the incoming line cabinet V4 is provided with normally open contacts (referred to as normally open points, i.e., closed position) and normally closed contacts (referred to as normally closed points, i.e., open position) of the auxiliary switch QF4 of the circuit breaker. The normally open contacts (referred to as normally open points, i.e., closed position) and normally closed contacts (referred to as normally closed points, i.e., open position) of each auxiliary switch are interlocked.

[0027] Refer to Figure 4 , the interlock circuit of the closing loop of the V1 incoming line cabinet: The normally closed contacts of the auxiliary switches QF3 and QF4 of the V3 incoming line cabinet and the V4 incoming line cabinet are connected in series and then in parallel with the normally closed contact of the auxiliary switch QFL of the tie cabinet VL, and then in series with the normally closed contact of the auxiliary switch QF2 of the V2 incoming line cabinet to form the electrical interlock circuit of the closing loop of the V1 incoming line cabinet. The conditions for the V1 incoming line cabinet to be able to close are as follows: Assuming that the VL tie cabinet is in the closed position, then QFL is in the closed position and the normally closed contact is separated; then it is necessary to ensure that the V2, V3, and V4 incoming line cabinets are simultaneously tripped, that is, the normally closed points in the open positions of QF2, QF3, and QF4 are connected in series. Or assuming that the VL tie cabinet is in the open position and QFL is in the open position, the normally closed contact is closed; it is necessary to ensure that the V2 incoming line cabinet is tripped, QF2 is in the open position, and the normally closed contact in the open position of QF2 is connected in series with the normally closed contact in the open position of QFL. Through comprehensive analysis, first connect the normally closed contact in the open position of QF3 and the normally closed contact in the open position of QF4 in series, connect its series branch in parallel with the normally closed contact in the open position of QFL, and connect its parallel branch in series with the normally closed contact in the open position of QF2 to finally form the interlock circuit of the closing loop of the V1 incoming line cabinet.

[0028] Similarly, for the conditions for the V2, V3, and V4 incoming line cabinets to be able to close, first assume that the VL tie cabinet is closed, then the remaining incoming line cabinets need to be simultaneously in the open position; or, if the VL tie cabinet is open, the other incoming line cabinet on the same bus also remains open. From the above analysis, the relevant interlock loops can be drawn: The open position of the other incoming line cabinet on the same bus is located in the main circuit, and the open positions of the other incoming line cabinets on the other buses and the VL tie cabinet are located in the branch parallel circuits, and the specific settings are as follows:

[0029] a) Connect the open position of QF3 and the open position of QF4 in series, connect its series branch in parallel with the open position of QFL, and connect its parallel branch in series with the open position of QF1 to form the interlock loop of the V2 incoming line cabinet.

[0030] b) Connect the QF1 tertiary position and the QF2 tertiary position in series, connect the series branch with the QFL tertiary position in parallel, and connect the parallel branch with the QF4 tertiary position in series to form the interlocking circuit of the V3 incoming cabinet.

[0031] c) Connect the QF1 tertiary position and the QF2 tertiary position in series, connect the series branch with the QFL tertiary position in parallel, and connect the parallel branch with the QF3 tertiary position in series to form the interlocking circuit of the V4 incoming cabinet.

[0032] Next, we need to determine the conditions for closing the VL contactor, which is more complicated. First, we determine the bus section I. If V1 is closed and QF1 is in the closed position, then V2, V3, and V4 should be opened, and QF2, QF3, and QF4 should be opened; if V2 is closed and QF2 is in the closed position, then V1, V3, and V4 should be opened, and QF1, QF3, and QF4 should be opened; from these two conditions, we can extract that if either V1 or V2 is closed, the other is opened, and the bus section II is opened. Through the above analysis, we can infer the situation of the bus section II in the same way: if either V3 or V4 is closed, the other is opened, and the bus section I is opened.

[0033] Based on the above discussion, the interlocking circuit of VL closing is drawn: first, QF1 is connected in parallel with QF2, QF1 is connected in parallel with QF2, QF3 is connected in series with QF4, and the above three branches are connected in series one by one, named branch 1.

[0034] Next, connect the QF3 quantile and the QF4 quantile in parallel, connect the QF3 combined quantile and the QF4 combined quantile in parallel, connect the QF1 quantile and the QF2 quantile in series, and connect the above three branches in series one by one, which is named branch 2.

[0035] Finally, connect the two ends of branch 1 and branch 2 in parallel to obtain the interlocking circuit of the VL contact cabinet.

[0036] The contents described in the embodiments of this specification are merely enumerations of implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. An intelligent interlocking control circuit for electrical switch cabinets based on multi-state collaborative judgment, characterized in that: The interlocking control loop is topologically arranged as follows: incoming cabinet V1-incoming cabinet V2-connecting cabinet VL-incoming cabinet V3-incoming cabinet V4, section I busbar is incoming cabinet V1-incoming cabinet V2, section II busbar is incoming cabinet V3-incoming cabinet V4, and when the connecting cabinet VL is in the open and closed state, the closing conditions of each incoming cabinet are controlled as follows: when the connecting cabinet VL is open, only one incoming cabinet on each side of the busbar is required to supply power; when the connecting cabinet VL is closed, only one incoming cabinet on both sides of the busbar is required to supply power.

2. The intelligent interlocking control circuit of an electrical switch cabinet based on multi-state collaborative judgment according to claim 1 is characterized in that: The incoming line cabinet V1 is provided with a normally open contact and a normally closed contact of the auxiliary switch QF1 of the circuit breaker, the incoming line cabinet V2 is provided with a normally open contact and a normally closed contact of the auxiliary switch QF2 of the circuit breaker, the connecting cabinet VL is provided with a normally open contact and a normally closed contact of the auxiliary switch QFL of the circuit breaker, the incoming line cabinet V3 is provided with a normally open contact and a normally closed contact of the auxiliary switch QF3 of the circuit breaker, the incoming line cabinet V4 is provided with a normally open contact and a normally closed contact of the auxiliary switch QF4 of the circuit breaker, and the normally open contacts and the normally closed contacts of each auxiliary switch are linked, and the interlocking control circuit includes a closing circuit interlocking circuit of the V1 incoming line cabinet, a closing circuit interlocking circuit of the V2 incoming line cabinet, a closing circuit interlocking circuit of the V3 incoming line cabinet, a closing circuit interlocking circuit of the V4 incoming line cabinet and a closing circuit interlocking circuit of the VL connecting cabinet.

3. The intelligent interlocking control circuit of an electrical switch cabinet based on multi-state collaborative judgment according to claim 2 is characterized in that: The V1 incoming cabinet closing circuit interlocking circuit includes the normally closed contact of the auxiliary switch QF2 of the circuit breaker of the incoming cabinet V2, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming cabinet V4 and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the contact cabinet VL. The normally closed contact of QF3 and the normally closed contact of QF4 are connected in series and then connected in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF2.

4. The intelligent interlocking control circuit of an electrical switch cabinet based on multi-state collaborative determination according to claim 2 is characterized in that: The V2 incoming cabinet closing circuit interlocking circuit includes the normally closed contact of the auxiliary switch QF1 of the circuit breaker of the incoming cabinet V1, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming cabinet V4 and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the contact cabinet VL. The normally closed contact of QF3 and the normally closed contact of QF4 are connected in series and then in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF1.

5. The intelligent interlocking control circuit of an electrical switch cabinet based on multi-state collaborative determination according to claim 2 is characterized in that: The V3 incoming cabinet closing circuit interlocking circuit includes the normally closed contact of the auxiliary switch QF1 of the circuit breaker of the incoming cabinet V1, the normally closed contact of the auxiliary switch QF2 of the circuit breaker of the incoming cabinet V2, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming cabinet V4 and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the contact cabinet VL. The normally closed contact of QF1 and the normally closed contact of QF2 are connected in series and then connected in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF4.

6. The intelligent interlocking control circuit of an electrical switch cabinet based on multi-state collaborative determination according to claim 2, characterized in that: The V4 incoming cabinet closing circuit interlocking circuit includes the normally closed contact of the auxiliary switch QF1 of the circuit breaker of the incoming cabinet V1, the normally closed contact of the auxiliary switch QF2 of the circuit breaker of the incoming cabinet V2, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming cabinet V3 and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the contact cabinet VL. The normally closed contact of QF1 and the normally closed contact of QF2 are connected in series and then connected in parallel with the normally closed contact of QFL, and the parallel branch is connected in series with the normally closed contact of QF3.

7. The intelligent interlocking control circuit of an electrical switch cabinet based on multi-state collaborative determination according to claim 2 is characterized in that: The VL contact cabinet closing circuit interlocking circuit includes the normally open contact and normally closed contact of the auxiliary switch QF1 of the incoming cabinet V1 circuit breaker, the normally open contact and normally closed contact of the auxiliary switch QF2 of the incoming cabinet V2 circuit breaker, the normally open contact and normally closed contact of the auxiliary switch QFL of the contact cabinet VL circuit breaker, the normally open contact and normally closed contact of the auxiliary switch QF3 of the incoming cabinet V3 circuit breaker, and the normally open contact and normally closed contact of the auxiliary switch QF4 of the incoming cabinet V4 circuit breaker; The normally closed contact of QF1 is connected in parallel with the normally closed contact of QF2, the normally open contact of QF1 is connected in parallel with the normally open contact of QF2, the normally closed contact of QF3 is connected in series with the normally closed contact of QF4, and the above three branches are connected in series one by one, named branch 1; Connect the normally closed contact of QF3 and the normally closed contact of QF4 in parallel, connect the normally open contact of QF3 and the normally open contact of QF4 in parallel, connect the normally closed contact of QF1 and the normally closed contact of QF2 in series, and connect the above three branches in series one by one, named branch 2; The two ends of the branch 1 and the branch 2 are connected in parallel.

Images