CN-224233339-U - Zero-loss depth current limiting system

Abstract

The utility model discloses a zero-loss deep current limiting system, a controller, an upper level switch and an electric signal transmission system, wherein the zero-loss deep current limiting device comprises a high-speed eddy current driving mechanism breaker, a current limiting reactor and a current transformer; the controller receives current signals transmitted by the current transformer and controls the high-speed eddy current driving mechanism breaker to switch on and off, the upper switch receives the jump signal from the controller, and the electric signal transmission system consists of a cable and an optical cable and is used for transmitting electric signals among the zero-loss deep current limiting device, the controller and the upper switch, so that the continuous energy consumption of the traditional current limiting device is avoided, zero-loss operation is realized, and the operation cost is effectively reduced.

Inventors

• ZHOU WEIQI
• FANG JIANFEI
• LIAO BIN
• YANG WENHAO
• Weng Changjun

Assignees

• 衢州东港环保热电有限公司

Dates

Publication Date

20260512

Application Date

20250403

Claims (1)

1. 1. The zero-loss depth current limiting system is characterized by comprising a zero-loss depth current limiting device (1), a controller (5), an upper-level switch (6) and an electric signal transmission system, wherein the zero-loss depth current limiting device (1) comprises a high-speed eddy current driving mechanism breaker (2), a current limiting reactor (3) and a current transformer (4), the high-speed eddy current driving mechanism breaker (2) is in closing short circuit with the current limiting reactor (3) when in normal operation, the high-speed eddy current driving mechanism breaker (2) is connected with the current limiting reactor (3) in parallel, and the current transformer (4) is arranged in a main loop to collect current signals; The controller (5) is electrically connected with the zero-loss depth current limiting device (1) to receive a current signal of the current transformer (4) and control the high-speed eddy current driving mechanism breaker (2) to be switched on and off, the upper switch (6) receives a jump signal from the controller (5), and the electric signal transmission system consists of a cable and an optical cable and is used for transmitting electric signals among the zero-loss depth current limiting device (1), the controller (5) and the upper switch (6); The high-speed eddy current driving mechanism circuit breaker (2) is of the type SPD-12kV/1250A-40kA, the switching-off time is less than or equal to 20ms, the maximum outer diameter DC of the zero-loss depth current limiting device (1) is less than or equal to 1200mm, the equipment inter-phase distance is more than or equal to 1.7DC, the equipment-to-barrier distance is more than or equal to 1.1DC, the distance from the top barrier is more than or equal to 0.5DC, the base is provided with a grounding terminal, each secondary wire with specific specifications is matched with the secondary wire, the secondary wire comprises a 4X 10mm 2 cable, a 2X 2.5mm 2 cable and a 6X 1.5mm 2 cable and is used for secondary loop signal transmission, the rated voltage of the current limiting reactor (3) is 6.3kV, and the type of the controller (5) is ZLB-ZK.

Description

Zero-loss depth current limiting system Technical Field The utility model belongs to the technical field of deep current limiting systems, and particularly relates to a zero-loss deep current limiting system. Background In the operation of a modern power system, short-circuit faults frequently occur, and the short-circuit current level is continuously increased, so that the problem of insufficient interruption capacity of a circuit breaker is increasingly highlighted. Meanwhile, the traditional current limiting device has huge energy consumption in the operation process, not only causes a great amount of energy waste, but also obviously increases the operation cost of the power system, and the existing current limiting technology is difficult to realize low-energy operation while effectively limiting short-circuit current. Disclosure of utility model The utility model aims to provide a zero-loss deep current limiting system so as to solve the technical defects that the current limiting device has huge energy consumption in the operation process, not only causes a great amount of energy waste, but also obviously increases the operation cost of an electric power system, and the current limiting technology is difficult to realize low-energy operation while effectively limiting short-circuit current. The zero-loss deep current limiting device comprises a high-speed eddy current driving mechanism circuit breaker, a current limiting reactor and a current transformer, wherein the high-speed eddy current driving mechanism circuit breaker is switched on and shorted with the current limiting reactor when in normal operation, the high-speed eddy current driving mechanism circuit breaker is connected with the current limiting reactor in parallel, and the current transformer is arranged in a main loop to collect current signals. The controller is electrically connected with the zero-loss depth current limiting device, receives a current signal transmitted by the current transformer and controls the switching on and off of the high-speed eddy current driving mechanism breaker, the upper switch receives a jump signal from the controller, and the electric signal transmission system consists of a cable and an optical cable and is used for transmitting electric signals among the zero-loss depth current limiting device, the controller and the upper switch. As a further scheme of the utility model, the type of the breaker of the high-speed eddy current driving mechanism is SPD-12kV/1250A-40kA, and the opening time is less than or equal to 20ms. As a further scheme of the utility model, the maximum outer diameter DC of the zero-loss depth current limiting device is less than or equal to 1200mm, the equipment inter-phase distance is more than or equal to 1.7DC, the equipment-to-obstacle distance is more than or equal to 1.1DC, the distance from the top obstacle is more than or equal to 0.5DC, the base is provided with a grounding terminal, and each secondary wire with specific specification is matched. As a further aspect of the present utility model, the secondary line includes a4×10mm2 cable, a 2×2.5mm2 cable, and a 6×1.5mm2 cable for secondary loop signal transmission. As a preferable scheme of the utility model, the rated voltage of the current limiting reactor is 6.3kV. As a preferable scheme of the utility model, the model of the controller is ZLB-ZK. Compared with the prior art, the zero-loss deep current limiting system has the following beneficial effects: 1. When the current limiting device is in normal operation, the circuit breaker of the high-speed eddy current driving mechanism is switched on, short-circuited and current limiting reactor, so that the continuous energy consumption of the traditional current limiting device is avoided, zero-loss operation is realized, and the operation cost is effectively reduced. 2. When a short circuit fault occurs, the controller can control the breaker of the high-speed eddy current driving mechanism to break in 20ms, rapidly cut off the short circuit current and transfer the short circuit current to the current limiting reactor, rapidly limit the short circuit current and protect power system equipment from the impact of the short circuit current. 3. After the short circuit fault is removed, the controller automatically detects the current state and controls the high-speed eddy current driving mechanism to switch on, so that the current limiting device is restored to a 'lossless' state, manual intervention is not needed, and the reliability and convenience of system operation are improved. 4. The utility model has the lower branch protection refusing processing mechanism, can jump the upper switch in a linked way when judging that the lower branch protection refuses, controls the switching on to avoid overheat burnout of the reactor, has reliable system grounding and reasonable secondary circuit configuration, and improves the operation safety and stability of the power system.