EP0538269A1 - Procede d'exploitation d'un sectionneur de puissance - Google Patents

Procede d'exploitation d'un sectionneur de puissance

Info

Publication number
EP0538269A1
EP0538269A1 EP19910910143 EP91910143A EP0538269A1 EP 0538269 A1 EP0538269 A1 EP 0538269A1 EP 19910910143 EP19910910143 EP 19910910143 EP 91910143 A EP91910143 A EP 91910143A EP 0538269 A1 EP0538269 A1 EP 0538269A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
time
pressure
pump
pump cycle
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.)
Withdrawn
Application number
EP19910910143
Other languages
German (de)
English (en)
Inventor
Eckard Pflaum
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 EP0538269A1 publication Critical patent/EP0538269A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/593—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for ensuring operation of the switch at a predetermined point of the ac cycle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H2009/566—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle with self learning, e.g. measured delay is used in later actuations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H2033/306—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator monitoring the pressure of the working fluid, e.g. for protection measures

Definitions

  • the invention relates to a method for operating a circuit breaker, in particular a high-voltage circuit breaker, with a hydraulic drive, which can be pressurized by an intermittently drivable hydraulic pump in a range between two pressure values, using a trigger control unit that responds to a switching signal the actuation of the switching elements at a time related to the zero crossing of the current to be switched or the applied mains voltage.
  • Such a method is described, for example, in US-A-3,555,354.
  • the purpose of the method is to keep the duration of the arc discharge between the circuit breakers of the circuit breaker as short as possible or to reliably prevent the arc from re-igniting at the time of zero current passage through a sufficient contact opening.
  • the phase angle of the current to be switched is measured via a converter.
  • the switch is actuated only on the condition that there is a period of time between the triggering time and the time of the next current zero crossing that is sufficient for the necessary opening of the switching elements of the switch.
  • Circuit breaker from the time the trigger signal is given until the time of disconnection of the contact pieces in a previous switch-off is supplied as a correction variable.
  • This method takes into account the aging-related long-term changes in the switching time. Since this correction variable is still dependent on the prevailing, short-term changing operating conditions of the switch, it is further proposed to provide the trigger control unit with further correction variables such as the temperature of the drive device, the time elapsed since the last switching operation, the supply voltage of a trigger magnet and the temperature of the winding of the release magnet.
  • the invention is based on the object of specifying a method of the type mentioned at the outset in which the acceleration force made available by the switch drive is detected and taken into account as a " correction variable when determining the triggering time.
  • the object is achieved in that the hydraulic pressure for a given switching signal is derived from the period of time that has elapsed since the end of the directly preceding pump cycle and the duration of this pump cycle, and in that the trigger control unit assigns a trigger delay time to this derived pressure value and emits a trigger signal at a point in time , which is before the time of actuation of the switching elements by the tripping delay time.
  • the time that elapses from the time the trigger signal for the switch is reached until a sufficient contact opening or closing is reached depends on the acceleration force that the switch drive system provides. In the case of a hydraulic drive, this acceleration force depends primarily on the hydraulic pressure available.
  • the pressure of the hydraulic fluid normally falls due to the internal leaks in the system such as e.g. B. on valves after a certain time function.
  • a hydraulic pump which from time to time pumps hydraulic fluid into the hydraulic system against the pressure of a gas spring in the hydraulic accumulator.
  • Two pressure switches are installed in the hydraulic system to control the hydraulic pump. If the pressure drops below a minimum pressure required for the switching operation to be carried out correctly, a signal is sent to a
  • Dispensed control device that switches on the hydraulic pump. If a nominal pressure valid for the system is exceeded, a further signal is sent to the control device, whereupon the hydraulic pump is switched off. After the hydraulic pump has been switched off, there is a slow drop in pressure to the minimum pressure, whereupon the hydraulic pump is switched on again.
  • the present invention takes the path of mathematically determining the hydraulic pressure. This takes advantage of the fact that the time course of the pressure drop in the hydraulic system during a pump cycle is highly identical to the time course of the previous pump cycle. From the knowledge of the duration of the previous pump cycle and the time that has elapsed since the end of the previous pump cycle, the current hydraulic pressure can be calculated approximately, provided the time function of the pressure drop is known.
  • An advantageous embodiment of the invention provides that the time constant for the pressure drop in the hydraulic system is calculated from the duration of the directly preceding pump cycle of the hydraulic drive, and that the hydraulic pressure for the time of the switching signal from the period past since the end of the directly preceding pump cycle by extrapolation is determined.
  • the time constant can be calculated from the duration of a pump cycle. If the initial value of the hydraulic pressure at the beginning of the pumping cycle is known, the instantaneous hydraulic pressure can be calculated from this at any point in time within this cycle.
  • a linear interpolation of the hydraulic pressure can also be sufficiently precise under certain circumstances.
  • the invention can advantageously be designed in such a way that a signal from one or more pressure switches is used to determine the start time and / or end time of a pump cycle.
  • a pump cycle can, for example, be defined in such a way that it begins when the minimum pressure in the hydraulic system is reached and ends when the minimum pressure in the hydraulic system is reached again.
  • the start of the pump cycle can then be defined by the signal of a pressure monitoring switch, which is sent to the control device to switch on the hydraulic pump.
  • the end of the pump cycle can then be defined by the following signal from the same pressure monitoring switch which causes the hydraulic pump to be switched on again.
  • the signals of the pressure monitoring switch are fed to the trigger control device or to a control unit connected to it, where they are further processed by calculation.
  • An embodiment of the invention is also conceivable in which a pump cycle is used to determine the start time and / or end time, the signal of a sensor which detects the activity of the hydraulic pump.
  • the start of a pump cycle can be defined by the end of the activity of the hydraulic pump and the end of a pump cycle by the start of the next active phase of the hydraulic pump.
  • the method according to the invention can be designed particularly advantageously such that the sensor for detecting the activity of the hydraulic pump detects the energy consumption of the pump motor.
  • the respective hydraulic pressure depends not only on the course of the pump cycle but also on the influence of the ambient temperature on the hydraulic system, in particular on the pressure of the gas spring. If the temperature is detected anyway by a temperature sensor, this influence of the temperature can be taken into account in the calculation of the hydraulic pressure.
  • FIG. 1 A hydraulic drive system for a power switch
  • Figure 2 a diagram with the time course of the switch
  • the high-voltage circuit breaker is actuated via the drive rod 1 by means of a hydraulic drive 2.
  • the hydraulic drive 2 has a pressure chamber for the hydraulic fluid as a hydraulic accumulator.
  • the hydraulic fluid is carried by a gas spring via a movable piston 4
  • Hydraulic pump 6 can be used to pump hydraulic fluid from a reservoir 7 into the pressure chamber. Such pumping of hydraulic fluid into the pressure chamber 3 is necessary if hydraulic fluid is lost in the long term due to internal leaks in the hydraulic system, such as on moving pistons.
  • Two pressure monitoring switches 8, 9 are provided for monitoring the hydraulic pressure. One of the pressure monitoring switches sends a signal to the pressure monitoring unit 10 as soon as a certain minimum pressure has been reached in the hydraulic system. The second pressure switch emits a signal to the pressure monitoring unit 10 as soon as a certain maximum pressure in the hydraulic system is exceeded.
  • the pressure monitoring unit 10 directly controls the hydraulic pump 6.
  • the pressure monitoring unit 10 switches on the hydraulic pump 6.
  • the hydraulic pump 6 then delivers hydraulic fluid from the reservoir 7 into the pressure chamber 3 until the other pressure switch 8, 9 reaches the nominal pressure * detected in the hydraulic system and reports to the pressure monitoring unit 10.
  • the pressure monitoring unit 10 then switches off the hydraulic pump 6.
  • the piston 4 is displaced against the pressure of the gas spring 5, whereby the gas spring is tensioned.
  • the pressure in the hydraulic system repeatedly drops from the maximum pressure in the course of a pumping cycle 11 (FIG. 3) to the minimum pressure, in order to be raised to the maximum value again by actuating the hydraulic pump.
  • the internal leaks in the hydraulic system remain unchanged, if the viscosity of the hydraulic fluid does not change, the leak rate and thus also the duration of a pump cycle remains constant for a long time.
  • FIG. 3 shows a diagram of the typical time course of the hydraulic pressure (Y axis) versus time (X axis).
  • a pump cycle 11 can, for example, be defined such that its start time 12 is when the minimum pressure is reached and the end time 13 is when the minimum pressure is reached again.
  • the following example relates to the case that a switching signal occurs during the pump cycle 21 (FIG. 3).
  • the duration of a directly preceding pump cycle 11 is known, the value for the hydraulic pressure currently available can be extrapolated from the end 13 of the pump cycle 11.
  • the maximum pressure and the minimum pressure of the Hydraulic systems are fixed by the pressure monitoring switches 8, 9.
  • the functional dependency of the hydraulic pressure on time is generally known or can be easily determined.
  • the duration of each pump cycle is determined by a computing unit 15.
  • the signals that are sent from the pressure monitoring switches 8, 9 to the pressure monitoring unit 10 and from there to the computing unit 15 are used for this purpose.
  • the duration of the pump cycle is included as a parameter in the functional dependence of the hydraulic pressure on the time.
  • the computing unit 15 thus has the functional dependency of the hydraulic pressure on the time available for the directly preceding pump cycle 11. This function is used for the calculation of the hydraulic pressure for the subsequent pump cycle.
  • the computing unit 15 is able to calculate the hydraulic pressure currently available from the time that has elapsed since the start time 13 of the current pump cycle 21. This calculation assumes that no further leaks have occurred in the hydraulic system between the previous pump cycle 11 and the pump cycle 21 that is currently running. Any change in the duration of a pump cycle that may occur is taken into account in the following pump cycle when calculating the hydraulic pressure.
  • the computing unit 15 is able to calculate the hydraulic pressure currently available.
  • a time device 22 is reset to zero and started at the start signal of each pump cycle, and the elapsed time period is read out at the start signal of the following pump cycle and stored as a parameter in a memory 23.
  • the time measuring device 22 is reset to zero and started for the next pump cycle. If a switching signal occurs, the time period that has elapsed since the start of the current pump cycle is read out from the time measuring device 22 and fed to an arithmetic logic unit 24.
  • the arithmetic unit calculates from this time period and that in the memory 23 parameters with the aid of a fixed extrapolation algorithm an approximate value for the hydraulic pressure currently available. This is fed to the trigger control unit 16.
  • the trigger control unit 16 assigns the available hydraulic pressure to an expected trigger delay time 17 (FIG. 2) between the trigger pulse and the desired phase-accurate opening of the switching pieces. Further operating conditions of the circuit breaker, such as, for example, the ambient temperature or the temperature of the hydraulic fluid, can also be included as correction values.
  • the trigger control device 16 is supplied with a phase-correct signal via a voltage or current converter 18.
  • the triggering control unit 16 emits a triggering pulse to the triggering device 25 of the circuit breaker at a point in time 19 which is around the triggering delay time 17 before the desired switching point 20, for example the point in time of zero current.
  • the contact pieces of the switch are then actuated and, for example, have reached a sufficient opening at time 20 of the zero current crossing, which prevents the arc from reigniting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

Selon un procédé d'exploitation d'un sectionneur de puissance, la pression hydraulique disponible dans un système hydraulique d'entraînement (2) est prise en considération en tant que valeur de correction afin de déterminer le retard de déclenchement, ce qui permet d'obtenir une commutation synchrone d'un commutateur de puissance à haute tension pourvu d'un entraînement hydraulique et exploité au moyen d'un appareil de commande du déclenchement (16). La pression hydraulique retombe de façon répétée dans le système hydraulique au cours d'un cycle de pompage (12) jusqu'à une valeur minimale, puis est ramenée à la valeur maximale par pompage d'appoint de fluide hydraulique contenu dans un réservoir (7) au moyen d'une pompe hydraulique (6). Etant donné que la chute de pression obéit à une fonction temporelle déterminée, la pression hydraulique dans chaque cycle de pompage peut être calculée à partir du temps écoulé depuis le début du cycle. Il n'est donc pas nécessaire de mesurer en continu la pression hydraulique. L'invention peut être avantageusement utilisée dans des commutateurs synchronisés.
EP19910910143 1990-07-12 1991-06-04 Procede d'exploitation d'un sectionneur de puissance Withdrawn EP0538269A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904022262 DE4022262A1 (de) 1990-07-12 1990-07-12 Verfahren zum betrieb eines leistungsschalters
DE4022262 1990-07-12

Publications (1)

Publication Number Publication Date
EP0538269A1 true EP0538269A1 (fr) 1993-04-28

Family

ID=6410187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910910143 Withdrawn EP0538269A1 (fr) 1990-07-12 1991-06-04 Procede d'exploitation d'un sectionneur de puissance

Country Status (3)

Country Link
EP (1) EP0538269A1 (fr)
DE (1) DE4022262A1 (fr)
WO (1) WO1992001303A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107037753A (zh) * 2017-03-23 2017-08-11 国家电网公司 一种高压开关设备用储能监测控制方法及装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6331687B1 (en) 1995-05-15 2001-12-18 Cooper Industries Inc. Control method and device for a switchgear actuator
US6538347B1 (en) 1995-05-15 2003-03-25 Mcgraw-Edison Company Electrical switchgear with synchronous control system and actuator
US6291911B1 (en) 1995-05-15 2001-09-18 Cooper Industries, Inc. Electrical switchgear with synchronous control system and actuator
EP4006938A1 (fr) * 2020-11-25 2022-06-01 Hitachi Energy Switzerland AG Moniteur pour appareillage de commutation ou disjoncteurs

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1173164B (de) * 1960-07-29 1964-07-02 Siemens Ag Steuergeraet fuer Wechselstrom-Synchronschalter
US3555354A (en) * 1969-03-11 1971-01-12 Gen Electric Alternating current circuit breaker having a control for timing opening relative to the current wave
US3622725A (en) * 1970-02-24 1971-11-23 Ite Imperial Corp Pressure controller for gas circuit breaker
GB2069762A (en) * 1980-02-14 1981-08-26 Lyons Claude Ltd Arrangement for controlling the operation of switch contacts
DE3545782A1 (de) * 1985-12-20 1987-06-25 Siemens Ag Hydraulische antriebsvorrichtung fuer einen elektrischen druckgasschalter
DE3710082C2 (de) * 1987-03-27 1994-05-19 Asea Brown Boveri Hydraulischer Antrieb für ein Hochspannungsschaltgerät
DD260364A1 (de) * 1987-04-30 1988-09-21 Berlin Treptow Veb K Schaltungsanordnung zum lastarmen schalten von kontakten
DE3812734A1 (de) * 1988-04-16 1989-10-26 Asea Brown Boveri Verfahren und einrichtung zur steuerung einer antriebseinrichtung eines mittel- oder hochspannungsschaltgeraetes
DE3905822A1 (de) * 1989-02-22 1990-08-23 Siemens Ag Verfahren zum betrieb eines leistungsschalters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9201303A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107037753A (zh) * 2017-03-23 2017-08-11 国家电网公司 一种高压开关设备用储能监测控制方法及装置
CN107037753B (zh) * 2017-03-23 2019-04-05 国家电网公司 一种高压开关设备用储能监测控制方法及装置

Also Published As

Publication number Publication date
WO1992001303A1 (fr) 1992-01-23
DE4022262A1 (de) 1992-01-16

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