EP4391004A1 - Schutzschalter, verfahren zur einstellung des nachlaufs eines schutzschalters und stromversorgungssystem - Google Patents

Schutzschalter, verfahren zur einstellung des nachlaufs eines schutzschalters und stromversorgungssystem Download PDF

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Publication number
EP4391004A1
EP4391004A1 EP21957998.4A EP21957998A EP4391004A1 EP 4391004 A1 EP4391004 A1 EP 4391004A1 EP 21957998 A EP21957998 A EP 21957998A EP 4391004 A1 EP4391004 A1 EP 4391004A1
Authority
EP
European Patent Office
Prior art keywords
contact
circuit breaker
pressure
moving
moving contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21957998.4A
Other languages
English (en)
French (fr)
Inventor
Xiaokuan LIU
Sheng Zhang
Jilong YAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP4391004A1 publication Critical patent/EP4391004A1/de
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00

Definitions

  • the present invention relates to the field of mechanical equipment, and in particular to a circuit breaker, a circuit breaker overtravel adjustment method and a power system.
  • Circuit breakers are important switching equipment of a power system. During the running of the power system, circuit breakers can connect or cut off load currents of electrical equipment. When exceptions occur to the power system, circuit breakers can reliably cut off a short-circuit current.
  • a contact pressure spring is connected to the moving contact of circuit breakers.
  • the contact pressure spring accumulates energy to drive the moving contact to move away from the static contact quickly to open circuit breakers again, and the opening reliability is improved.
  • the contact pressure spring has a certain overtravel.
  • Overtravel refers to the length to which the contact pressure spring continues to be compressed after the moving contact and the static contact are in contact with each other in the closing process.
  • the overtravel can increase the contact pressure between the moving contact and the static contact to guarantee the reliable connection and cut-off of a current and the mechanical life of circuit breakers.
  • a pressure detector is adopted to measure the pressure of the contact pressure spring. Since a linear relationship exists between the pressure and the overtravel, the overtravel can be calculated according to the pressure.
  • the precision in this testing method will decrease for the reasons such as wear-out after circuit breakers are used for a period of time. As a result, the measured overtravel is incorrect, and the safety and reliability of the running of circuit breakers are influenced.
  • the present invention provides a circuit breaker, a circuit breaker overtravel adjustment method and a power system.
  • a circuit breaker comprises an arc extinguishing structure, a moving contact and a static contact.
  • the arc extinguishing structure has an arc extinguishing chamber, at least a part of the static contact stretches into the arc extinguishing chamber, and a part of the moving contact stretches into the arc extinguishing chamber.
  • the circuit breaker further comprises a driving assembly, the driving assembly being connected with the moving contact and driving the moving contact to contact or separate from the static contact, and the driving assembly having an accommodating cavity; a contact pressure spring, the contact pressure spring being provided in the accommodating cavity, abutting between the moving contact and the driving assembly and being used to apply an acting force toward the static contact to the moving contact in a closed state of the circuit breaker; a detection assembly, the detection assembly comprising a pressure detector and a distance sensor, the pressure detector being provided between the contact pressure spring and the driving assembly to detect the pressure of the contact pressure spring when the moving contact and the static contact abut tightly against each other, and the distance sensor being used to detect the detection distance between the moving contact and the distance sensor so that the overtravel between the moving contact and the static contact can be determined according to the pressure and the detection distance.
  • the distance between the moving contact and the static contact can be adjusted.
  • the driving assembly comprises an insulating pull rod and a bushing
  • the bushing is provided in the insulating pull rod and can be driven by the insulating pull rod to move relative to the static contact
  • the length the bushing protrudes out of the insulating pull rod can be adjusted to adjust the distance between the moving contact and the static contact in an open state
  • the accommodating cavity is provided in the bushing
  • the contact pressure spring and the detection assembly are provided in the accommodating cavity of the bushing.
  • the insulating pull rod and the bushing are thread-connected.
  • the moving contact comprises a contact body and a moving rod
  • the moving rod is detachably connected with the contact body, at least a part of the moving rod stretches into the accommodating cavity and abuts against the contact pressure spring, and the distance sensor is used to measure the distance between one end of the moving rod in the accommodating cavity and the distance sensor.
  • the moving rod comprises a rod body and a retaining flange
  • the retaining flange is provided outside the rod body
  • the extension direction of the retaining flange is perpendicular to the lengthwise direction of the rod body
  • a cover plate for retaining the retaining flange is provided in the bushing
  • a first end of the contact pressure spring abuts against the retaining flange
  • a second end of the contact pressure spring abuts against the pressure detector.
  • the pressure detector comprises an upper cover, a pressure-sensitive element and a base
  • the base is provided on the driving assembly
  • the pressure-sensitive element is fixedly provided on the base
  • the upper cover covers the pressure-sensitive element
  • the contact pressure spring abuts against the upper cover
  • the circuit breaker further comprises a data transmission unit, and the data transmission unit is respectively electrically connected with the pressure detector and the distance sensor to receive and transmit a pressure acquired by the pressure detector and the detection data of the distance sensor.
  • a circuit breaker overtravel adjustment method is provided, the method is used for the abovementioned circuit breaker, and the method comprises: receiving a pressure, detected by the pressure detector, of the contact pressure spring and a detection distance detected by the distance sensor; if at least one of the conditions that the pressure is less than a preset nominal pressure and the detection distance is greater than a preset nominal distance is satisfied, generating a driving assembly adjustment message to indicate an adjustment of the length by which the bushing in the driving assembly protrudes out of the insulating pull rod.
  • a power system comprises the abovementioned circuit breaker.
  • the arc extinguishing structure in the present embodiment can be used for installing and protecting the moving contact and the static contact.
  • the closing and opening of the circuit breaker are realized through the contact of the moving contact with the static contact and the separation of the moving contact from the static contact.
  • the driving assembly is used to drive the moving contact to move.
  • the contact pressure spring is provided in the accommodating cavity of the driving assembly, the contact pressure spring is used to provide an abutting force for the moving contact in a closed state, and in addition, the contact pressure spring accumulates some energy in a closing process of the circuit breaker to provide high initial energy for the moving contact at the time of the opening of the circuit breaker so that the moving contact can be separated from the static contact at high speed in an initial condition to break an electrical arc and/or a melted solder connection between the moving contact and the static contact.
  • a detection assembly is provided in the accommodating cavity.
  • the detection assembly comprises the pressure detector and the distance sensor.
  • the pressure detector detects the pressure (the pressure is roughly equal to the abutting force the contact pressure spring provides for the moving contact, the rough equality means that the difference between the pressure and the abutting force is less than the allowable error, and the allowable error can be determined according to the specific structure of the circuit breaker, the gravity of the moving contact and other factors, which are not restricted in the present embodiment) of the contact pressure spring, and the distance sensor detects the detection distance between the moving contact and the distance sensor. In this way, the real overtravel and the abutting force between the moving contact and the static contact can be determined according to the detected pressure and detection distance. Thus, the detection accuracy is improved and the problem of an insufficient abutting force caused by fatigue relaxation of the contact pressure spring, or the wear-out or ablation of the moving contact or the static contact can be avoided.
  • the circuit breaker comprises a moving contact 22, a static contact 21, an arc extinguishing structure 10 and a driving assembly 50.
  • the arc extinguishing structure 10 is used for insulation and sealing.
  • the driving assembly 50 is used to drive the moving contact 22 to move relative to the static contact 21 to realize the opening or closing of the circuit breaker.
  • the closing process of the circuit breaker means that the driving assembly 50 drives the moving contact 22 to move in a direction near to the static contact 21 so that the moving contact 22 contacts the static contact 21 and conducts electricity.
  • the opening process of the circuit breaker means that the driving assembly 50 drives the moving contact 22 to move in a direction away from the static contact 21 so that the moving contact 22 is separated from the static contact 21 and stops conducting electricity.
  • the contact pressure spring used to apply an acting force to the moving contact 22 has a certain overtravel.
  • Overtravel refers to the length to which the contact pressure spring 30 continues to be compressed after the moving contact 22 and the static contact 21 are in contact with each other.
  • the driving assembly 50 moves to a first position
  • the moving contact 22 contacts the static contact 21.
  • the driving assembly 50 continues to move a distance, namely, the overtravel, to reach a second position.
  • the contact pressure spring continues to be compressed to increase the abutting force between the moving contact 22 and the static contact 21, and thus, the contact resistance between them is low.
  • a circuit breaker In order to realize the reliable detection of the overtravel and the abutting force between the moving contact 22 and the static contact 21, a circuit breaker is provided in the present embodiment, and the circuit breaker comprises an arc extinguishing structure 10, a moving contact 22 and a static contact 21, the arc extinguishing structure 10 has an arc extinguishing chamber 11, at least a part of the static contact 21 stretches into the arc extinguishing chamber 11, a part of the moving contact 22 stretches into the arc extinguishing chamber 11, and the circuit breaker further comprises a driving assembly 50, a contact pressure spring 30 and a detection assembly 40.
  • the driving assembly 50 is connected with the moving contact 22 and drives the moving contact 22 to contact or separate from the static contact 21, and the driving assembly 50 has an accommodating cavity.
  • the contact pressure spring 30 is provided in the accommodating cavity, abuts between the moving contact 22 and the driving assembly 50 and is used to apply an acting force toward the static contact 21 to the moving contact 22 in a closed state of the circuit breaker.
  • the detection assembly 40 comprises a pressure detector 41 and a distance sensor 42, the pressure detector 41 is provided between the contact pressure spring 30 and the driving assembly 50 to detect the pressure of the contact pressure spring 30 when the moving contact 22 and the static contact 21 abut tightly against each other, and the distance sensor 42 is used to detect the detection distance between the moving contact 22 and the distance sensor 42 so that the overtravel between the moving contact 22 and the static contact 21 can be determined according to the pressure and the detection distance.
  • the arc extinguishing structure 10 can protect the moving contact 22 and the static contact 21.
  • the arc extinguishing structure 10 may be a cylinder of a column or a cylinder whose cross-section is a rectangle or other shape, and the cylinder comprises a side wall, a top wall and a bottom wall, which form the arc extinguishing chamber 11.
  • the arc extinguishing structure 10 may be other proper structures in other embodiments and the specific structure is not restricted here.
  • At least a part of the static contact 21 stretches into the arc extinguishing chamber 11 (the static contact 21 may be fully fixed in the arc extinguishing chamber 11 or one part stretches into the arc extinguishing chamber 11 and the other part is located outside the arc extinguishing chamber 11), a part of the moving contact 22 stretches into the arc extinguishing chamber 11, the moving contact 22 can move relative to the static contact 21, and the opening or closing of the circuit breaker is realized through the contact or separation between the moving contact and the static contact.
  • the driving assembly 50 is used to drive the moving contact 22 to move.
  • the contact pressure spring 30 is provided in the accommodating cavity of the driving assembly 50, the contact pressure spring 30 is used to provide an abutting force for the moving contact 22 in a closed state, and in addition, the contact pressure spring 30 accumulates some energy in a closing process of the circuit breaker to provide high initial energy for the moving contact 22 at the time of the opening of the circuit breaker so that the moving contact 22 can be separated from the static contact 21 at high speed in an initial condition to break an electrical arc and/or a melted solder connection between the moving contact 22 and the static contact 21.
  • a detection assembly 40 is provided in the accommodating cavity, the detection assembly 40 comprises the pressure detector 41 and the distance sensor 42, the pressure detector 41 detects the pressure (the pressure is roughly equal to the abutting force the contact pressure spring 30 provides for the moving contact 22, the rough equality means that the difference between the pressure and the abutting force is less than the allowable error, and the allowable error can be determined according to the specific structure of the circuit breaker, the gravity of the moving contact 22 and other factors, which are not restricted in the present embodiment) of the contact pressure spring 30, and the distance sensor 42 detects the detection distance between the moving contact 22 and the distance sensor 42.
  • the real overtravel and the abutting force between the moving contact 22 and the static contact 21 can be determined according to the detected pressure and detection distance.
  • the detection accuracy is improved and the problem of an insufficient abutting force caused by fatigue relaxation of the contact pressure spring 30, or the wear-out or ablation of the moving contact 22 or the static contact 21 can be avoided.
  • the cylinder or the casing in other shapes of the arc extinguishing structure 10 is an insulating casing.
  • the static contact 21 is fixed relative to the arc extinguishing structure 10.
  • the moving contact 22 can move relative to the arc extinguishing structure 10 to contact or separate from the static contact 21.
  • the distance between the moving contact 22 and the static contact 21 can be adjusted in an open state of the circuit breaker in the present embodiment.
  • the driving assembly 50 may be located in a first position.
  • the distance between the moving contact 22 and the static contact 21 can be adjusted by adjusting the position of the moving contact 22. If the distance between the moving contact 22 and the static contact 21 before the adjustment is a first distance, then the distance between them after the adjustment is a second distance, and the second distance is less than the first distance.
  • the overtravel of the contact pressure spring 30 increases in the process of the movement of the driving assembly 50 from the first position to the second position because the distance between the moving contact 22 and the static contact 21 decreases.
  • the driving assembly 50 comprises an insulating pull rod 52 and a bushing 53.
  • the insulating pull rod 52 is connected with the power source in the circuit breaker so that it is driven by the power source to move and then drive the bushing 53, the contact pressure spring 30 and the moving contact 22 to move.
  • the insulating pull rod may comprise a pull rod segment and a pull rod frame, the pull rod frame may be integrated with the pull rod segment, and the pull rod segment is connected with the power source.
  • the pull rod frame is provided on an end portion of the pull rod segment and is used to accommodate the bushing 53.
  • the bushing 53 is provided in the insulating pull rod 52 and can be driven by the insulating pull rod 52 to move relative to the static contact 21.
  • the bushing 53 has the previously-mentioned accommodating cavity, and the contact pressure spring 30 and the detection assembly 40 are provided in the accommodating cavity so that they are borne by the bushing 53.
  • the length by which the bushing 53 protrudes out of the insulating pull rod 52 can be adjusted to adjust the distance between the moving contact 22 and the static contact 21 in an open state.
  • the length by which the bushing 53 protrudes out of the insulating pull rod 52 may be the distance between the upper end face 51 of the bushing 53 and the upper end face of the pull rod frame. Since a part of the moving contact 22 stretches into the bushing 53, the distance between the moving contact 22 and the static contact 21 can be changed by adjusting the length by which the bushing 53 protrudes out of the insulating pull rod 52. Such an adjustment way is simple, reliable and safe. In addition, since the structures of the bushing 53 and the insulating pull rod 52 are simple, the reliability is further improved and the probability of a failure is reduced.
  • the insulating pull rod 52 and the bushing 53 are thread-connected. Such a connection way guarantees that not only the length by which the bushing 53 protrudes out of the insulating pull rod 52 can be adjusted, but also the pitch of thread can be set according to the required adjustment precision to satisfy the adjustment precision requirement.
  • the moving contact 22 in the present embodiment comprises a contact body 221 and a moving rod 222.
  • the contact body 221 is mainly used to contact the static contact 21 to conduct electricity.
  • the moving rod 222 is detachably connected with the contact body 221, and at least a part of the moving rod 222 stretches into the accommodating cavity to abut against the contact pressure spring 30 to realize the cooperation between the moving contact 22 and the contact pressure spring 30.
  • one end of the moving rod 222 in the accommodating cavity abuts against the contact pressure spring 30.
  • the moving rod 222 comprises a rod body and a retaining flange 2221, the retaining flange 2221 is provided outside the rod body, the extension direction (left-to-right direction shown in Fig. 1 ) of the retaining flange 2221 is perpendicular to the lengthwise direction (up-to-down direction shown in Fig. 1 ) of the rod body, and a first end of the contact pressure spring 30 abuts against the retaining flange 2221 to push the moving contact 22 to move.
  • a part of the contact pressure spring 30 can be put on the rod body.
  • the rod body is utilized to guide the extension and retraction of the contact pressure spring 30, and in addition, the rod body can be utilized to provide some support for the contact pressure spring 30 and avoid the contact pressure spring from being twisted when the contact pressure spring is pressed.
  • the retaining flange 2221 may be in the shape of a ring or in any other proper shape, and the specific shape is not restricted here.
  • a cover plate 531 for retaining the retaining flange 2221 is provided in the bushing 53. The reliability of cooperation is guaranteed after the cover plate 531 retains the retaining flange 2221.
  • the pressure detector 41 is provided in the bushing 53. Specifically, the second end of the contact pressure spring 30 abuts against the pressure detector 41. In this way, the pressure detector 41 can reliably detect the pressure of the contact pressure spring 30.
  • the pressure detector 41 comprises an upper cover 411, a pressure-sensitive element 412 and a base 413
  • the base 413 is provided on the driving assembly 50 (for example, in the bushing 53 of the driving assembly 50)
  • the pressure-sensitive element 412 is fixedly provided on the base 413
  • the upper cover 411 covers the pressure-sensitive element 412
  • the contact pressure spring 30 abuts against the upper cover 411.
  • the upper cover 411 can protect the pressure-sensitive element 412 on the one hand, and can transfer the pressure applied by the contact pressure spring 30 on the pressure-sensitive element 412 on the other hand.
  • the pressure-sensitive element 412 is used to convert the pressure into an electrical signal to realize the accurate measurement of the pressure.
  • the base 413 can support the pressure-sensitive element 412 and the upper cover 411.
  • a groove is provided in the middle of the base 413, the distance sensor 42 is provided in the groove, and the distance sensor 42 is used to measure the distance between one end of the moving rod 222 in the accommodating cavity and the distance sensor 42.
  • the distance is a detection distance.
  • the overtravel can be accurately determined according to the detection distance, and then whether the overtravel satisfies the requirement can be determined.
  • the distance sensor 42 may be any sensor, for example, laser sensor, which can realize a distance detection and convert the detected distance into an electrical signal.
  • the type of the distance sensor is not restricted in the present embodiment.
  • the circuit breaker further comprises a data transmission unit 43, and the data transmission unit 43 is respectively electrically connected with the pressure detector 41 and the distance sensor 42 to receive and transmit a pressure acquired by the pressure detector 41 and the detection data of the distance sensor 42.
  • the data transmission unit 43 may be a wired data transmission chip or a wireless data transmission chip (for example, WIFI chip or Bluetooth chip).
  • Fig. 1 and Fig. 2 two through-holes are provided in the base 413 to correspond to the distance sensor 42 and the pressure-sensitive element 412, respectively, and one transmission line passes through one through-hole and connects the distance sensor 42 and the data transmission unit 43 to send the detection distance detected by the distance sensor 42 to the data transmission unit 43.
  • Another transmission line passes through the other through-hole and connects the pressure-sensitive element 412 and the data transmission unit 43 to send the acquired pressure to the data transmission unit 43.
  • the data transmission unit 43 can send a pressure and a detection distance to a gateway in a wired or wireless way, and the pressure and the detection distance are transmitted to an external monitor through the gateway.
  • the monitor can display the pressure and the detection distance in real time, or determine whether it is necessary to adjust the distance between the moving contact 22 and the static contact 21 in an open state according to the pressure and the detection distance to guarantee the abutting force between the moving contact 22 and the static contact 21 in a closed state.
  • the overtravel adjustment process of the circuit breaker is described as follows: Before fatigue relaxation occurs to the contact pressure spring 30 and wear-out or ablation occurs to the moving contact 22 and the static contact 21, the power source drives the insulating pull rod 52 to move from the first position to the second position, the insulating pull rod 52 drives the bushing 53 and the moving contact 22 to move to allow the moving contact 22 to contact the static contact 21, and the overtravel to which the contact pressure spring 30 is compressed is a first overtravel in a closing process.
  • the pressure of the contact pressure spring 30 detected by the pressure detector 41 is denoted as pressure P1
  • the abutting force between the moving contact 22 and the static contact 21 may be considered approximately equal to P1.
  • the detection distance detected by the distance sensor 42 between the distance sensor and the lower end face of the rod body of the moving contact 22 (namely, the end face of one end of the rod body in the bushing 53) is denoted as distance H1.
  • the power source drives the insulating pull rod 52 to move from the first position to the second position, the insulating pull rod 52 drives the bushing 53 and the moving contact 22 to move to allow the moving contact 22 to contact the static contact 21, and the overtravel to which the contact pressure spring 30 is compressed is a first overtravel in a closing process.
  • the detection distance detected by the distance sensor 42 between the distance sensor and the lower end face of the rod body of the moving contact 22 is still distance Hl.
  • the elasticity produced by the same compressed distance decreases so that the pressure (denoted as pressure P2) detected by the pressure detector 41 also decreases, that is to say, pressure P2 is less than pressure P1, and then, the abutting force between the moving contact 22 and the static contact 21 is less than pressure P1.
  • the contact resistance between the moving contact 22 and the static contact 21 is likely to increase.
  • the bushing 53 can be rotated to increase the length by which the bushing 53 protrudes out of the insulating pull rod after the opening of the circuit breaker. In this way, the insulating pull rod 52 still moves from the first position to the second position, but the compressed overtravel of the contact pressure spring 30 is greater than the first overtravel. Then, the elasticity produced by the contact pressure spring 30 increases, and the abutting force between the moving contact 22 and the static contact 21 increases to reduce the contact resistance.
  • the distance between the moving contact 22 and the static contact 21 increases in an open state (that is to say, the insulating pull rod 52 is in the first position).
  • the compressed overtravel of the contact pressure spring 30 is denoted as a second overtravel, and the second overtravel is less than the first overtravel. In this way, the detection distance (denoted as distance H2) detected by the distance sensor 42 is less than distance H1.
  • the compressed overtravel of the contact pressure spring 30 decreases, the acting force applied by the contact pressure spring 30 on the moving contact 22 decreases, resulting in an increase of the contact resistance between the moving contact 22 and the static contact 21.
  • the distance the bushing 53 protrudes out of the insulating pull rod 52 can be adjusted to increase the compressed overtravel of the contact pressure spring 30 in an open state.
  • a circuit breaker overtravel adjustment method is provided.
  • the method is used for the abovementioned circuit breaker and the method comprises: receiving a pressure, detected by the pressure detector 41, of the contact pressure spring 30 and a detection distance detected by the distance sensor 42; if at least one of the conditions that the pressure is less than a preset nominal pressure and the detection distance is greater than a preset nominal distance is satisfied, generating a driving assembly 50 adjustment message to indicate an adjustment of the length by which the bushing 53 in the driving assembly 50 protrudes out of the insulating pull rod 52.
  • the method may be executed by a monitor deployed outside the circuit breaker or a data processing chip (for example, PLC, embedded processor, IMU or CPU) deployed inside the circuit breaker and having a data processing capability.
  • a data processing chip for example, PLC, embedded processor, IMU or CPU
  • the executor of the method is not restricted here.
  • the method executed by an external monitor for example, is described, and the monitor can acquire the pressure and the detection distance from the data transmission unit 43 of the circuit breaker through a gateway.
  • a driving assembly 50 adjustment message may be generated to indicate an adjustment of the length by which the bushing 53 in the driving assembly 50 protrudes out of the insulating pull rod 52.
  • the driving assembly 50 adjustment message may be a prompt message displayed on the monitor to inform a worker of adjusting the length by which the bushing 53 protrudes out of the insulating pull rod 52. In this way, the worker can adjust the bushing 53 in time after seeing the message.
  • the message may further contain a length after an adjustment, calculated according to information such as pressure, parameters of the contact pressure spring 30, for example, elasticity coefficient, and detection distance to help the worker to quickly adjust the length to the correct one.
  • the detection distance is greater than a preset nominal distance (which can be measured and determined before the circuit breaker leaves the factory or can be measured and calibrated when the circuit breaker is used for the first time.
  • a preset nominal distance which can be measured and determined before the circuit breaker leaves the factory or can be measured and calibrated when the circuit breaker is used for the first time.
  • the overtravel is insufficient and a driving assembly 50 adjustment message may be generated to indicate an adjustment of the length by which the bushing 53 in the driving assembly 50 protrudes out of the insulating pull rod 52.
  • the process of generating the message is similar to that in the previous case and therefore will not be described again.
  • a power system comprises the abovementioned circuit breaker.
  • the circuit breaker since the pressure detector 41 and the distance sensor 42 in the circuit breaker can collaborate to acquire the pressure and the detection distance, a decrease of the pressure or overtravel of the contact pressure spring 30 can be detected in time when ablation or wear-out occurs to the moving contact or the static contact or fatigue relaxation occurs to the contact pressure spring 30, avoiding the problem of incorrect monitoring results caused by low adaptability of a single detection method to the two changes, improving the accuracy of the monitoring results and then improving the reliability.
  • the bushing 53 is connected in the pull rod frame and the length by which the bushing 53 protrudes relative to the pull rod frame can be adjusted; the length by which the bushing protrudes can conveniently and quickly be adjusted to increase the pressure or overtravel when the pressure or the overtravel decreases.
  • the adjustment is more convenient, quicker and safer.
  • the abutting force namely, contact pressure

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Breakers (AREA)
EP21957998.4A 2021-09-26 2021-09-26 Schutzschalter, verfahren zur einstellung des nachlaufs eines schutzschalters und stromversorgungssystem Pending EP4391004A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/120803 WO2023044880A1 (zh) 2021-09-26 2021-09-26 断路器、断路器超程调整方法及电力系统

Publications (1)

Publication Number Publication Date
EP4391004A1 true EP4391004A1 (de) 2024-06-26

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EP21957998.4A Pending EP4391004A1 (de) 2021-09-26 2021-09-26 Schutzschalter, verfahren zur einstellung des nachlaufs eines schutzschalters und stromversorgungssystem

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EP (1) EP4391004A1 (de)
WO (1) WO2023044880A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116754934B (zh) * 2023-05-22 2024-02-23 杭州轨物科技有限公司 一种高压断路器机械特性故障诊断方法
CN117524785A (zh) * 2023-10-30 2024-02-06 正泰电气股份有限公司 灭弧室及具有其的断路器
CN117690752B (zh) * 2024-02-02 2024-04-09 广东正超电气有限公司 永磁真空断路器超程设定方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4064383A (en) * 1976-04-26 1977-12-20 General Electric Company Vacuum circuit breaker with improved means for limiting overtravel of movable contact at end of opening stroke
CN201332066Y (zh) * 2009-01-15 2009-10-21 常州市明及电气技术开发有限公司 断路器用新型操作绝缘子
CN203572932U (zh) * 2013-11-19 2014-04-30 川开电气股份有限公司 一种断路器触头分合时刻和超程的监测装置
CN108054051B (zh) * 2017-11-09 2020-03-20 河南平高通用电气有限公司 一种断路器及其超程弹性装置

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