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 utility model, topology adaptive reconstruction, multi-source cooperative control, energy efficiency optimization contribution and operation and maintenance intelligentization are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical switchgear distribution equipment technical field, especially a kind of interlock control loop for electrical switchgear. BACKGROUND

[0002] With the in-depth promotion of digital transformation of China's electric power industry, environmentally friendly gas insulated switchgear with compact structure design, intelligent operation characteristics and low-carbon environmental protection advantages has become the core equipment of modern distribution network upgrading and reconstruction. This kind of equipment plays an important role in smart city distribution network engineering, industrial park microgrid system, rail transit power supply network and data center power hub and other key scenes, and its operation reliability directly affects the power supply quality and fault self-healing ability of smart grid.

[0003] The switchgear assembly includes three core modules: incoming line cabinet, contact cabinet and outgoing line cabinet. Among them, the incoming line cabinet undertakes the function of high-voltage power access, the contact cabinet realizes the topological interconnection and operation mode switching between multi-bus systems, and the outgoing line cabinet completes the directional power transmission 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 diagram.

[0004] In view of the control bottleneck of existing switchgear equipment under complex networking mode, especially the problems of insufficient topological adaptability and lack of multi-source collaborative control in multi-node switchgear networking operation, the utility model focuses on solving the compatibility defects of traditional mechanical interlocking system under multi-source, dual-source switch-single-source radiation hybrid power supply mode. By deeply integrating the intelligent interlocking control technology of electrical switchgear, multi-modal state recognition and edge computing control architecture, an intelligent interlocking control loop with topological adaptive characteristics is constructed, which can effectively meet the core needs of new power system for flexible reconstruction of distribution network architecture, flexible access of distributed power supply and improvement of power supply reliability. SUMMARY

[0005] In order to overcome the deficiencies of poor topological reconstruction flexibility and lack of multi-source dynamic coordination mechanism in existing switchgear distribution system, the utility model proposes an intelligent interlocking control loop for electrical switchgear based on multi-state collaborative judgment, which realizes topological adaptive reconstruction, multi-source collaborative control, energy efficiency optimization contribution and intelligent operation and maintenance.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] An intelligent interlocking control loop of an electrical switch cabinet based on multi-state cooperative judgment, the interlocking control loop topology is arranged as: incoming line cabinet V1-incoming line cabinet V2-connection cabinet VL-incoming line cabinet V3-incoming line cabinet V4, the I section bus is incoming line cabinet V1-incoming line cabinet V2, the II section bus is incoming line cabinet V3-incoming line cabinet V4, under the condition of opening and closing of the connection cabinet VL, the closing conditions of each incoming line cabinet are controlled as follows: under the condition of opening of the connection cabinet VL, each side bus is required to be powered by only one incoming line cabinet; under the condition of closing of the connection cabinet VL, both sides of the bus are required to be powered by only one incoming line cabinet.

[0008] Further, the incoming line cabinet V1 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF1 of the circuit breaker, the incoming line cabinet V2 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF2 of the circuit breaker, the connection cabinet VL is provided with the normally open contact and the normally closed contact of the auxiliary switch QFL of the circuit breaker, the incoming line cabinet V3 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF3 of the circuit breaker, the incoming line cabinet V4 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF4 of the circuit breaker, the normally open contact and the normally closed contact of each auxiliary switch are linked, and the interlocking control loop comprises a V1 incoming line cabinet closing loop interlocking circuit, a V2 incoming line cabinet closing loop interlocking circuit, a V3 incoming line cabinet closing loop interlocking circuit, a V4 incoming line cabinet closing loop interlocking circuit and a VL connection cabinet closing loop interlocking circuit.

[0009] Still further, the V1 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of the auxiliary switch QF2 of the circuit breaker of the incoming line cabinet V2, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming line cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming line cabinet V4 and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the connection 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.

[0010] Still further, the V2 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of the auxiliary switch QF1 of the circuit breaker of the incoming line cabinet V1, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming line cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming line cabinet V4 and the normally closed contact of the auxiliary switch QFL of the circuit breaker of the connection 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 QF1.

[0011] The V3 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally closed contact of auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally closed contact of auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4 and the normally closed contact of auxiliary switch QFL of the circuit breaker of 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.

[0012] The V4 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally closed contact of auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally closed contact of auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3 and the normally closed contact of auxiliary switch QFL of the circuit breaker of 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.

[0013] The VL contact cabinet closing loop interlocking circuit comprises the normally open contact and normally closed contact of auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally open contact and normally closed contact of auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally open contact and normally closed contact of auxiliary switch QFL of the circuit breaker of contact cabinet VL, the normally open contact and normally closed contact of auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3 and the normally open contact and normally closed contact of auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4.

[0014] 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 three branches are connected in series, and the branch is named as branch 1.

[0015] The normally closed contact of QF3 is connected in parallel with the normally closed contact of QF4, the normally open contact of QF3 is connected in parallel with the normally open contact of QF4, the normally closed contact of QF1 is connected in series with the normally closed contact of QF2, and the three branches are connected in series, and the branch is named as branch 2.

[0016] The branch 1 and the branch 2 are connected in parallel at both ends.

[0017] The beneficial effects of the utility model mainly show in: topology self-adapting reconstruction, multi-source collaborative control, energy efficiency optimization contribution and operation and maintenance intelligentization. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the arrangement and combination schematic view of four incoming line switch cabinets, two outgoing line cabinets and one contact cabinet, and the outgoing line cabinet configured in the subsequent engineering example is hidden for the convenience of description.

[0019] Figure 2Is the electrical interlocking truth table used by electrical incoming line cabinet and electrical contact cabinet.

[0020] Figure 3 Is the linkage circuit breaker auxiliary switch QF contact sub-position (normally closed point 1-2) and the closing position (normally open point 3-4) used by the electrical incoming line cabinet and the electrical contact cabinet. The sub-position and the closing position of the same electrical cabinet QF contact are logically linked in opposite relationship.

[0021] Figure 4 Is the electrical interlocking logic relationship of the electrical incoming line cabinet and the electrical contact cabinet. DETAILED DESCRIPTION

[0022] The utility model will be further described below with reference to the drawings.

[0023] Referring to Figures 1 to 4 , a kind of based on multi-state collaborative determination electrical switchgear intelligent interlocking control loop, the switchgear unit of this embodiment adopts five cabinet combination structure, namely incoming line cabinet V1, incoming line cabinet V2, contact cabinet VL, incoming line cabinet V3 and incoming line cabinet V4, the topology arrangement of interlocking control loop is as follows: incoming line cabinet V1-incoming line cabinet V2-contact cabinet VL-incoming line cabinet V3-incoming line cabinet V4, I section busbar is incoming line cabinet V1-incoming line cabinet V2 (omitting outgoing line cabinet), II section busbar is incoming line cabinet V3-incoming line cabinet V4 (omitting outgoing line cabinet).

[0024] In the embodiment, in the case where contact cabinet VL is opened, it is required that each side busbar is powered by only one incoming line cabinet. For example: V1 and V3 incoming line cabinet are closed, then V2 and V4 cannot be closed; V1 and V4 incoming line cabinet are closed, then V2 and V3 cannot be closed; V2 and V3 incoming line cabinet are closed, then V1 and V4 cannot be closed; V2 and V4 incoming line cabinet are closed, then V1 and V3 cannot be closed.

[0025] In the embodiment, in the case where contact cabinet VL is closed, it is required that both sides busbar is powered by only one incoming line cabinet, and the remaining incoming line cabinet cannot be closed. For example: when V1 and VL cabinet are closed, the remaining incoming line cabinets V2, V3 and V4 cannot be closed; when V2 and VL cabinet are closed, the remaining incoming line cabinets V1, V3 and V4 cannot be closed; when V3 and VL cabinet are closed, the remaining incoming line cabinets V1, V2 and V4 cannot be closed; when V4 and VL cabinet are closed, the remaining incoming line cabinets V1, V2 and V3 cannot be closed.

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

[0027] Referring to Figure 4 The V1 incoming line cabinet closing loop interlocking circuit: 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, then connected in parallel with the normally closed contact of the auxiliary switch QFL of the contactor cabinet VL, then connected in series with the normally closed contact of the auxiliary switch QF2 of the V2 incoming line cabinet to form the V1 incoming line cabinet closing loop electrical interlocking circuit. The conditions for the V1 incoming line cabinet to be closed, assuming that the VL contactor cabinet is in the closed position, the QFL is in the closed position, and the normally closed contact is open; then it is necessary to ensure that the V2, V3 and V4 incoming line cabinets are simultaneously opened, i.e. the normally closed contacts of the QF2, QF3 and QF4 are connected in series. Or assume that the VL contactor cabinet is in the open position, the QFL is in the open position, and the normally closed contact is closed; it is necessary to ensure that the V2 incoming line cabinet is opened, i.e. the QF2 is in the open position, and the normally closed contact of the QF2 open position is connected in series with the normally closed contact of the QFL open position. After comprehensive analysis, the normally closed contacts of the QF3 open position and the QF4 open position are connected in series, the series branch is connected in parallel with the normally closed contact of the QFL open position, and the parallel branch is connected in series with the normally closed contact of the QF2 open position, to finally form the closing loop interlocking circuit of the V1 incoming line cabinet.

[0028] Similarly, the conditions for the V2, V3 and V4 incoming line cabinets to be closed are that, according to the assumption that the VL contactor cabinet is closed, the remaining incoming line cabinets all need to be simultaneously in the open position; or the VL contactor cabinet is opened, and the other incoming line cabinet of the bus also remains open. From the above analysis, the relevant interlocking circuit can be drawn: the other incoming line cabinet of the bus is in the open position in the main loop, and the open positions of the remaining incoming line cabinets and the VL contactor cabinet are in the branch parallel loop, which is specifically set as:

[0029] a) the normally closed contacts of the QF3 open position and the QF4 open position are connected in series, the series branch is connected in parallel with the normally closed contact of the QFL open position, and the parallel branch is connected in series with the normally closed contact of the QF1 open position to form the interlocking circuit of the V2 incoming line cabinet.

[0030] b) QF1 is connected in series with QF2, the series branch of which is connected in parallel with QFL, the parallel branch of which is connected in series with QF4, forming the interlocking loop of V3 incoming line cabinet.

[0031] c) QF1 is connected in series with QF2, the series branch of which is connected in parallel with QFL, the parallel branch of which is connected in series with QF3, forming the interlocking loop of V4 incoming line cabinet.

[0032] Next, the condition of closing VL contact cabinet is determined, which is more complex. First, the I section bus is determined, if V1 is closed, QF1 is in the closing position, then V2, V3, V4 should be opened, QF2, QF3, QF4 are in the open position; if V2 is closed, QF2 is in the closing position, then V1, V3, V4 should be opened, QF1, QF3, QF4 are in the open position; from the above two, it is extracted that V1 and V2 are closed, and the other is opened, and the II section bus is opened. Through the above analysis, the II section bus can be deduced in the same way, V3 and V4 are closed, and the other is opened, and the I section bus is opened.

[0033] According to the above discussion, the interlocking loop 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, named branch 1.

[0034] Next, QF3 is connected in parallel with QF4, QF3 is connected in parallel with QF4, QF1 is connected in series with QF2, and the above three branches are connected in series, named branch 2.

[0035] Finally, the two ends of branch 1 and branch 2 are connected in parallel, and the interlocking loop of VL contact cabinet is obtained.

[0036] The content described in the embodiments of the specification is only a list of implementation forms of the utility model concept, and is only for illustrative purposes. The protection scope of the utility model should not be regarded as limited to the specific forms described in the embodiments, and the protection scope of the utility model also extends to the equivalent technical means that can be thought of by those skilled in the art according to the utility model concept.

Claims

1. An intelligent interlocking control loop for electrical switchgear based on multi-state cooperative decision making, characterized in that, The interlocking control loop topology is: incoming line cabinet V1-incoming line cabinet V2-contact cabinet VL-incoming line cabinet V3-incoming line cabinet V4, the I section bus is incoming line cabinet V1-incoming line cabinet V2, the II section bus is incoming line cabinet V3-incoming line cabinet V4, and the closing condition of each incoming line cabinet is controlled as follows under the opening and closing state of the contact cabinet VL: in the case of opening of the contact cabinet VL, each side bus is required to be powered by only one incoming line cabinet; in the case of closing of the contact cabinet VL, both sides of the bus are required to be powered by only one incoming line cabinet.

2. The intelligent interlocking control loop for electrical switchgear based on multi-state cooperative decision as claimed in claim 1, wherein, The incoming line cabinet V1 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF1 of the circuit breaker, the incoming line cabinet V2 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF2 of the circuit breaker, the contact cabinet VL is provided with the normally open contact and the normally closed contact of the auxiliary switch QFL of the circuit breaker, the incoming line cabinet V3 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF3 of the circuit breaker, and the incoming line cabinet V4 is provided with the normally open contact and the normally closed contact of the auxiliary switch QF4 of the circuit breaker, the normally open contact and the normally closed contact of each auxiliary switch are linked, and the interlocking control loop comprises a V1 incoming line cabinet closing loop interlocking circuit, a V2 incoming line cabinet closing loop interlocking circuit, a V3 incoming line cabinet closing loop interlocking circuit, a V4 incoming line cabinet closing loop interlocking circuit and a VL contact cabinet closing loop interlocking circuit.

3. The intelligent interlocking control loop for electrical switchgear based on multi-state cooperative decision as claimed in claim 2, wherein, The V1 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of the auxiliary switch QF2 of the circuit breaker of the incoming line cabinet V2, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming line cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming line 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 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 loop for electrical switchgear based on multi-state cooperative decision as claimed in claim 2, wherein, The V2 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of the auxiliary switch QF1 of the circuit breaker of the incoming line cabinet V1, the normally closed contact of the auxiliary switch QF3 of the circuit breaker of the incoming line cabinet V3, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming line 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 connected 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 loop for electrical switchgear based on multi-state coordination decision as claimed in claim 2, wherein, The V3 incoming line cabinet closing loop interlocking circuit comprises the normally closed contact of the auxiliary switch QF1 of the circuit breaker of the incoming line cabinet V1, the normally closed contact of the auxiliary switch QF2 of the circuit breaker of the incoming line cabinet V2, the normally closed contact of the auxiliary switch QF4 of the circuit breaker of the incoming line 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 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 loop for electrical switchgear based on multi-state coordination decision as claimed in claim 2, wherein, The closing loop interlocking circuit of the V4 incoming line cabinet comprises the normally closed contact of auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally closed contact of auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally closed contact of auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3 and the normally closed contact of auxiliary switch QFL of the circuit breaker of 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 loop for electrical switchgear based on multi-state coordination decision as claimed in claim 2, wherein, The closing loop interlocking circuit of the VL contact cabinet comprises the normally open contact and normally closed contact of auxiliary switch QF1 of the circuit breaker of incoming line cabinet V1, the normally open contact and normally closed contact of auxiliary switch QF2 of the circuit breaker of incoming line cabinet V2, the normally open contact and normally closed contact of auxiliary switch QFL of the circuit breaker of contact cabinet VL, the normally open contact and normally closed contact of auxiliary switch QF3 of the circuit breaker of incoming line cabinet V3 and the normally open contact and normally closed contact of auxiliary switch QF4 of the circuit breaker of incoming line cabinet V4; 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, which is named as branch 1; The normally closed contact of QF3 is connected in parallel with the normally closed contact of QF4, the normally open contact of QF3 is connected in parallel with the normally open contact of QF4, the normally closed contact of QF1 is connected in series with the normally closed contact of QF2, and the above three branches are connected in series one by one, which is named as branch 2; The branch 1 and the branch 2 are connected in parallel at both ends.

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