EP2182537A1 - Relaisschaltung - Google Patents

Relaisschaltung Download PDF

Info

Publication number
EP2182537A1
EP2182537A1 EP08105717A EP08105717A EP2182537A1 EP 2182537 A1 EP2182537 A1 EP 2182537A1 EP 08105717 A EP08105717 A EP 08105717A EP 08105717 A EP08105717 A EP 08105717A EP 2182537 A1 EP2182537 A1 EP 2182537A1
Authority
EP
European Patent Office
Prior art keywords
relay
circuit
contacts
monitor
driver
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Withdrawn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
EP08105717A
Other languages
English (en)
French (fr)
Inventor
Richard Kenney
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
Priority to EP08105717A priority Critical patent/EP2182537A1/de
Publication of EP2182537A1 publication Critical patent/EP2182537A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits

Definitions

  • This invention relates to relays for providing isolated safe digital outputs from electronic equipment.
  • auxiliary contact which is used to determine the switching state of the relay.
  • a pair of relays is used and it is desirable to determine that they are operating correctly. This may be done by observing the state of the auxiliary contacts when a switching command is applied to one of the relays. If the auxiliary contacts fail to open when commanded to do so then it is assumed that the relay has failed and the control system then opens both relays and signals a fault.
  • FIG. 1 An example of a prior art arrangement is shown in figure 1 . It will be seen that the upper relay R1 operates contact set A and the lower relay R2 operates contact set B. For circuit C to operate both contact sets have to be closed as they are connected in series.
  • the contact sets include auxiliary contacts which are connected to a relay status monitor M which determines when the contacts are open or closed. If it determines that a fault has occurred in one relay, say the upper one R1, it will issue a command to the relay controller to open both relays. The lower relay will then break the connection to the circuit C.
  • the prior art arrangement relies upon the auxiliary contacts operating in tandem with the primary contacts in order to infer from them the state of the primary contacts. It is however possible for the primary contacts to fail in such a way that the auxiliary contacts continue to function as expected (for example, if the primary contacts become oxidised no current will flow even though they are brought together). Not all faults are therefore detectable in the prior art.
  • the present invention arose in an attempt to provide a more reliable relay arrangement that avoids or at least mitigates the possibility of undetectable faults.
  • a relay circuit having a set of contacts to be actuated to in use to be connected to a circuit to be operated and a relay status indicating circuit energised by closure of the contacts to provide an indication of the relay status.
  • the relay status indicating circuit comprises an isolating coupling device which connects the circuit to a relay monitor. This ensures good electrical isolation although other ways of coupling a signal providing an indication of the relay status may be used.
  • An opto-coupler is preferred but other types of coupler may be used such as capacitive or inductive couplers
  • the relay monitor is preferably coupled to a relay driver to provide a signal thereto indicating a condition of the relay. In the event that the condition is that the relay is faulty then the driver will switch the relay to an off state.
  • a pairing of relays as earlier described is provided in series connection such that by breaking the contacts in one relay disconnects both sets of contacts from another item of electronic equipment.
  • a relay circuit 1 comprises a pair of relays 2 and 3; a relay driver 4 connected to the relays 2, 3; respective relay contacts 5 and 6 for the relays 2 and 3 respectively; a rectifier circuit 7 and 8 connected across each set of contacts; opto-couplers 9 and 10 powered by the rectifier circuits and a relay monitor 11.
  • a circuit 12 is shown in the figure connected to the output of the relay circuit 1.
  • relay contacts 5 and 6 are arranged in series and thus both have to be closed by their respective relays in order that the output is closed for the circuit 12.
  • the rectifiers 7 and 8 are coupled across each of the contacts such that when both are closed they provide power to a diode 13 and 14 via resistors 15 and 16.
  • the diodes 13 and 14 are light emitting diodes and when powered, the light is propagated over a gap to a respective detector 17 and 18.
  • the gap provides the electrical isolation.
  • the detectors 17 and 18 provide outputs to the relay monitor 11.
  • the relay monitor 11 provides a control signal to the relay driver 4 and also receives a signal indicating whether or not the driver has activated the relays. In the event that the relay monitor does not receive a signal from the optical - couplers, when the driver is switching the relays on, a fault condition is determined.
  • the relay monitor 11 then sends a signal to the relay driver 4 to switch the relays 2 and 3 off.

Landscapes

  • Relay Circuits (AREA)
EP08105717A 2008-10-31 2008-10-31 Relaisschaltung Withdrawn EP2182537A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08105717A EP2182537A1 (de) 2008-10-31 2008-10-31 Relaisschaltung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08105717A EP2182537A1 (de) 2008-10-31 2008-10-31 Relaisschaltung

Publications (1)

Publication Number Publication Date
EP2182537A1 true EP2182537A1 (de) 2010-05-05

Family

ID=40445748

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105717A Withdrawn EP2182537A1 (de) 2008-10-31 2008-10-31 Relaisschaltung

Country Status (1)

Country Link
EP (1) EP2182537A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0694937A2 (de) * 1994-07-29 1996-01-31 Siemens Aktiengesellschaft Verfahren zur Bestimmung der Restlebensdauer von Kontakten in Schaltgeräten und zugehörige Anordnung
EP0994546A2 (de) * 1998-10-16 2000-04-19 Alstom UK Limited Verbesserungen bezüglich Vorrichtungen zur Überwachung für elektrische Schaltungen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0694937A2 (de) * 1994-07-29 1996-01-31 Siemens Aktiengesellschaft Verfahren zur Bestimmung der Restlebensdauer von Kontakten in Schaltgeräten und zugehörige Anordnung
EP0994546A2 (de) * 1998-10-16 2000-04-19 Alstom UK Limited Verbesserungen bezüglich Vorrichtungen zur Überwachung für elektrische Schaltungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "SPER 1B1 C4, SPER 1C1 and SPER 1C2 Supervision relay", ABB USER'S MANUAL AND TECHNICAL DESCRIPTION, 22 March 2007 (2007-03-22), ABB, VAASA, FINLAND, XP002520582, Retrieved from the Internet <URL:http://library.abb.com/global/scot/scot229.nsf/veritydisplay/6c7b646e455aa8ecc12572aa004955e5/$File/FM_SPER1_1_750231_ENe.pdf> *

Similar Documents

Publication Publication Date Title
EP2256777B1 (de) Fehlererkennungsvorrichtung für einen beweglichen Kontakt
US7933104B2 (en) Safety switching apparatus for a failsafe disconnection of an electrical load
CN101400939B (zh) 安全地接通和断开包括微控制器的用电器的设备和方法
CN101203930B (zh) 安全断开电力负载的安全开关装置
US20070182255A1 (en) Safety switching module
US8218281B2 (en) Control circuit for controlling a semiconductor switch system
CN102135578A (zh) 用于诊断电连接线路的方法和输出组件
CN105304411B (zh) 继电器监视
EP2256565A2 (de) System zum Senden von Signalen zwischen Modulen
CN109560529A (zh) 电源电路及音响设备
US6813132B1 (en) Control system for an electromagnetic switching device and electromagnetic switching device corresponding thereto
TWI740940B (zh) 故障電流限制器及其方法
CN109585219B (zh) 安全开关
JP5951524B2 (ja) 電源装置
CN113078620B (zh) 配电系统和监测配电系统中的区域选择性联锁的方法
US8934208B2 (en) Trip circuit supervision relay for low and medium voltage applications
EP2182537A1 (de) Relaisschaltung
CN101271787B (zh) 自动识别和区分连接至安全组合设备的电子传感器的装置及方法
KR100442326B1 (ko) 자기진단형 안전 계전기
JP2000244373A (ja) 中継器及びそれを用いたネットワーク
CN110058153B (zh) 继电器监视装置
CN101821946B (zh) 用于将变换器装置连接至两极线路的接口
JP6676803B2 (ja) 第１の機器用電源装置及び警報システム
JPH09101336A (ja) 制御機器用駆動装置
CN115159281A (zh) 二通道抱闸控制电路

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

AKY No designation fees paid
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20101106