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CN-114784749-B - Circuit breaker system

CN114784749BCN 114784749 BCN114784749 BCN 114784749BCN-114784749-B

Abstract

For a circuit breaker system (3) comprising a first circuit breaker (1) and a second circuit breaker (2), the first circuit breaker (1) having a first trip unit, a first control unit and a first electrical sensor, the first control unit controlling the first trip unit, the second circuit breaker (2) having a second trip unit, a second control unit and a second electrical sensor, the second control unit controlling the second trip unit, the circuit breaker system (3) further comprising means for communication of the first control unit with the second control unit, it is suggested that the first control unit monitors via the means for communication whether an internal device fault is present in the second circuit breaker (2), wherein the first control unit is adapted to change its standard trip characteristics to emergency trip characteristics when an internal device fault of the second circuit breaker (2) is detected.

Inventors

  • R. Jurkovice
  • R. Messel
  • W. Dickler

Assignees

  • 伊顿智能动力有限公司

Dates

Publication Date
20260505
Application Date
20220104
Priority Date
20210105

Claims (8)

  1. 1. A circuit breaker system (3), the circuit breaker system (3) comprising: A first circuit breaker (1) and a second circuit breaker (2), the first circuit breaker (1) having a first trip unit, a first control unit and a first electrical sensor, the first control unit controlling the first trip unit, the second circuit breaker (2) having a second trip unit, a second control unit and a second electrical sensor, the second control unit controlling the second trip unit, characterized in that the circuit breaker system (3) further comprises means for communication of the first control unit with the second control unit, the first control unit monitoring via the means for communication whether an internal device fault is present in the second circuit breaker (2), wherein the first control unit is adapted to change its standard trip characteristic to an emergency trip characteristic when an internal device fault of the second circuit breaker (2) is detected.
  2. 2. Circuit breaker system (3) according to claim 1, characterized in that the second control unit has means for detecting an internal device fault in the second circuit breaker (2) and if the second control unit is detecting an internal device fault, the second control unit sends the internal device fault of the second circuit breaker (2) to the first control unit.
  3. 3. The circuit breaker system (3) of claim 1 or 2 wherein the first control unit is adapted to continuously poll the second circuit breaker (2) to detect an internal device failure of the second circuit breaker (2).
  4. 4. A circuit breaker system (3) according to any of claims 1 to 3 wherein the second circuit breaker (2) has at least a semiconductor switch.
  5. 5. The circuit breaker system (3) of any one of claims 1 to 4 wherein said standard trip characteristics and said emergency trip characteristics comprise trip currents related to overcurrent or short-circuit current thresholds and/or residual current thresholds.
  6. 6. The circuit breaker system (3) of any one of claims 1 to 5 wherein the emergency trip characteristics of the first control unit are in particular in compliance with the trip characteristics of the second control unit.
  7. 7. A power distribution network comprising a circuit breaker system (3) according to any one of claims 1 to 6, wherein the first circuit breaker is located upstream of the second circuit breaker (2).
  8. 8. A method for operating a circuit breaker system (3), the circuit breaker system (3) comprising: The circuit breaker comprises a first circuit breaker (1) and a second circuit breaker (2), wherein the first circuit breaker (1) is provided with a first tripping unit, a first control unit and a first electric sensor, the first control unit controls the first tripping unit, the second circuit breaker (2) is provided with a second tripping unit, a second control unit and a second electric sensor, and the second control unit controls the second tripping unit, and the circuit breaker is characterized in that the first control unit is communicated with the second control unit, the first control unit monitors whether an internal device fault exists in the second circuit breaker (2), and when the internal device fault of the second circuit breaker (2) is detected, the first control unit changes the standard tripping characteristic of the first control unit into the emergency tripping characteristic.

Description

Circuit breaker system Technical Field The present invention relates to a circuit breaker system according to the generic part of claim 1. Background Conventionally, programmable circuit breakers having a processor and different trip curves are used in different circuit breaker systems. It is common practice for a power distribution network to include circuit breakers downstream of other circuit breakers. In the case of defective circuit breakers, such as Miniature Circuit Breakers (MCBs), hybrid Circuit Breakers (HCBs) or Solid State Circuit Breakers (SSCBs), different methods can be used, for example, to notify the system operator via immediate tripping or via fault communication. However, due to this single failure, one part of the system may be taken offline or the security level may be reduced. It may happen that tripping is no longer possible. In the case of a second fault, such as an overcurrent or residual current, the level of fault required for tripping the upstream circuit breaker is higher than the original level of fault. For example, if the MCB detects a trip condition, but fails to fully perform the trip due to an internal fault condition that it detects along the line after the trip has been initiated, portions of the system may be damaged if the device still tries to use them to interrupt the current. Such internal damage may occur, for example, if the interrupting semiconductor is unable to break and the series isolation relay has no breaking capacity rating for this trip current in a solid state or hybrid circuit breaker. Other system components may also be damaged. For example, the downstream electrical wires may overheat due to higher currents because the upstream circuit breaker will trip only after reaching its trip threshold. Disclosure of Invention The object of the present invention is to overcome the drawbacks of the prior art by providing a circuit breaker system for achieving safe operation. According to the invention, the aforementioned object is solved by the features of claim 1. As a result, the circuit breaker system achieves this object and has the advantage of achieving safe operation. As a result the first control unit monitors via the means for communicating whether there is an internal device fault in the second circuit breaker, wherein the first control unit is adapted to change its standard trip characteristic to an emergency trip characteristic when an internal device fault of the second circuit breaker is detected, the internal device fault can be detected in an efficient and fast manner, and a complete system fault can be avoided. It is possible to prevent a defective circuit breaker from being harmfully exploded and damaging surrounding components in the closure member. Therefore, the safety level of the circuit breaker system is not lowered, and the total system normal operation time can be prolonged. It is another object of the present invention to overcome the disadvantages of the prior art by providing a method for operating a circuit breaker system for achieving safe operation. According to the invention, the object is solved by the features of claim 8. The advantages of this method are consistent with the advantages of the apparatus. Further preferred embodiments of the invention are described in the dependent claims. Drawings The present invention is described with reference to the accompanying drawings. The drawings illustrate only exemplary embodiments of the invention. Fig. 1 shows a preferred embodiment of a circuit breaker system in a schematic view. Detailed Description Fig. 1 shows at least a part of a preferred embodiment of a circuit breaker system 3 comprising a first circuit breaker 1 and a second circuit breaker 2, the first circuit breaker 1 having a first trip unit, a first control unit and a first electrical sensor, the first control unit controlling the first trip unit, the second circuit breaker 2 having a second trip unit, a second control unit and a second electrical sensor, the second control unit controlling the second trip unit, the circuit breaker system 3 further comprising means for communication of the first control unit with the second control unit, wherein the first control unit monitors via the means for communication whether an internal device fault is present in the second circuit breaker 2, wherein the first control unit is adapted to change its standard trip characteristic to an emergency trip characteristic when an internal device fault of the second circuit breaker 2 is detected. Further, a method for operating a circuit breaker system 3 is provided, the circuit breaker system 3 comprising a first circuit breaker 1 and a second circuit breaker 2, the first circuit breaker 1 having a first trip unit, a first control unit and a first electrical sensor, the first control unit controlling the first trip unit, the second circuit breaker 2 having a second trip unit, a second control unit and a second electrical sensor, the secon