A 35kV double bus connection power supply system

Abstract

The application discloses a 35kV double-bus connection power supply system and relates to the technical field of protection and control of power supply and distribution networks. The double-bus connection power supply system can realize uninterrupted power supply through switching operation, can realize uninterrupted maintenance, can remove a fault bus alone and can quickly cut off a fault line. The double-bus connection power supply system solves the problem that the existing single-bus connection power supply system causes power supply interruption of users, influences power supply continuity and stability during maintenance. The double-bus connection power supply system is compact, safe and efficient.

Description

Technical Field

[0001] This utility model relates to the field of protection and control technology of power system transmission and distribution networks, specifically a 35kV double busbar connection power supply system. Background Technology

[0002] In the existing 35kV power supply system transmission and distribution network, most use a single busbar system. As the system has been in operation for many years, the performance of the equipment in the power system deteriorates and faults occur frequently. During maintenance, the power supply system needs to be shut down for repairs, which affects the continuity and stability of power supply.

[0003] Therefore, based on the above problems, this utility model provides a 35kV double busbar connection power supply system. Utility Model Content

[0004] To address the aforementioned shortcomings in the existing technology, this utility model provides a 35kV double busbar connection power supply system. The double busbar connection power supply system can achieve uninterrupted power supply during switching operations, enables non-power-off maintenance, allows for the separate removal of faulty busbars, and can quickly disconnect faulty lines.

[0005] This utility model is implemented using the following technical solution: a 35kV double busbar connection power supply system, including two busbars, one being a working busbar section I and the other being a standby busbar section II. Power supply 1, power supply 2 and the circuit of each outgoing line are connected to the two busbars respectively via a circuit breaker and two busbar disconnect switches. The working busbar section I and the standby busbar section II are connected by a busbar tie circuit breaker QFC.

[0006] Furthermore, the bus tie circuit breaker QFC is disconnected, the working bus is section I, the bus disconnecting switch QS1 on the working bus section I side of power supply 1, power supply 2 and outgoing line is connected, the standby bus is section II, the standby bus disconnecting switch QS2 on power supply 1, power supply 2 and outgoing line is disconnected, and the standby bus section II is not energized.

[0007] Compared with the prior art, the technical advantages of this utility model are as follows: the switching bus operation when the double busbar is connected can achieve uninterrupted power supply, the double busbar can achieve non-power-off maintenance, the faulty busbar can be removed separately, and the faulty line can be quickly disconnected. Attached Figure Description

[0008] Figure 1 Wiring system diagram of this utility model.

[0009] Attached reference numerals: Section I - Working busbar, Section II - Standby busbar, QFC - Bus tie circuit breaker, QS1 - Working busbar side disconnecting switch, QS2 - Standby busbar side disconnecting switch, 1QF - Circuit breaker for power supply circuit 1, 1QS1 - Working busbar side disconnecting switch, 1QS2 - Standby busbar side disconnecting switch, QF11 - Circuit breaker for outgoing circuit WL1, QS11 - Working busbar side disconnecting switch for outgoing circuit WL1, QS12 - Standby busbar side disconnecting switch for outgoing circuit WL1, WL1 - Outgoing circuit. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0011] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0012] like Figure 1 As shown, the double busbar power supply system has two busbar sections: a working busbar section I and a standby busbar section II. Power supply 1, power supply 2, and each outgoing circuit are connected to the two busbar sections via a circuit breaker and two busbar disconnect switches, respectively. The working busbar section I and the standby busbar section II are connected by a busbar tie circuit breaker QFC.

[0013] Figure 1 The wiring operation mode is as follows: the bus tie circuit breaker QFC is open, the working bus is section I, and the bus disconnecting switch QS1 on the working bus section I side of power supply 1, power supply 2, and outgoing lines is connected. The standby bus is section II, and the standby bus disconnecting switch QS2 on power supply 1, power supply 2, and outgoing lines is open, so the standby bus section II is not energized. In this way, because the double busbar wiring system has a standby bus, the reliability and flexibility of the wiring are improved. Its characteristics are as follows: When the busbar is under maintenance, the power supply and outgoing lines can continue to operate without interrupting the power supply to users. If the working busbar section I is under maintenance, all circuits can be transferred to the standby busbar section II for operation; this operation is called a switching operation. The specific operating steps are as follows: First, check whether the standby busbar section II is intact and usable. To do this, first connect the disconnecting switches QS1 and QS2 on both sides of the bus tie circuit breaker QFC, and then connect the bus tie circuit breaker QFC. If a short-circuit fault exists in the standby busbar section II, the bus tie circuit breaker QFC will immediately trip under the action of relay protection; if the standby busbar section II is intact, the bus tie circuit breaker QFC will be energized and operated normally after being connected. After that, disconnect the relay protection of the bus tie circuit breaker, and then connect the bus disconnecting switch 1QS2 on the standby busbar section II side and the bus disconnecting switch 1QS1 on the working busbar section I side in sequence. Since the voltages of the working busbar section I and the standby busbar section II are equal at this time, and there is no load on the line, both disconnecting switches 1QS1 and 1QS2 can be opened and closed without generating an electric arc. Finally, the bus tie circuit breaker QFC and its two disconnecting switches QS1 and QS2 are disconnected, and all circuits will then operate on the standby busbar section II, while the original working busbar section I can be inspected. During the above operation, no circuit stopped operating.

[0014] When overhauling the disconnector switch between working busbar section I and standby busbar section II, simply disconnect the disconnector switch circuit. If overhaul is required... Figure 1 For the bus disconnector 1QS1 in the wiring diagram, first disconnect the circuit breaker 1QF and disconnector 1QS1 in the power supply circuit 1, and transfer the power supply 2 and all outgoing lines to the standby bus section II. The switching bus operation steps are the same as above. Then disconnect the bus tie circuit breaker QFC and the disconnectors 1QS1 and 1QS2 on both sides. The working bus section I will then be de-energized, and 1QS2 will be in the open position. At this time, 1QS1 will also be de-energized, and maintenance can be carried out.

[0015] When a fault occurs in section I of the working busbar, operation can be switched to section II of the standby busbar, and power supply to all circuits can be quickly restored. If a short-circuit fault occurs in section I of the working busbar, the circuit breakers of each power supply circuit will automatically trip. Then, the circuit breakers of each outgoing circuit and the disconnecting switches on the working busbar I side are disconnected, the disconnecting switches on the standby busbar II side of each circuit are connected, and the circuit breakers of each power supply and outgoing circuit are connected. In this way, power supply to each circuit is quickly restored on the standby busbar II.

[0016] The above power supply system enables uninterrupted power supply, non-power-off maintenance, individual removal of faulty busbars, and rapid disconnection of faulty lines, greatly ensuring the continuity and stability of power supply.

[0017] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A 35kV double busbar connection power supply system, characterized in that: It includes two busbars: a working busbar section I and a standby busbar section II. The circuits of power supply 1, power supply 2, and each outgoing line are connected to the two busbars via a circuit breaker and two busbar disconnect switches respectively. The working busbar section I and the standby busbar section II are connected by a busbar tie circuit breaker QFC.

2. The 35kV double busbar connection power supply system according to claim 1, characterized in that: When the bus tie circuit breaker QFC is open, the working bus is section I, and the bus disconnecting switch QS1 on the working bus section I side of power supply 1, power supply 2 and outgoing line is connected. The standby bus is section II, and the standby bus disconnecting switch QS2 on power supply 1, power supply 2 and outgoing line is open. The standby bus section II is not energized.

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