EP0243412A4 - Poste a declenchement interdependant. - Google Patents

Poste a declenchement interdependant.

Info

Publication number
EP0243412A4
EP0243412A4 EP19860906242 EP86906242A EP0243412A4 EP 0243412 A4 EP0243412 A4 EP 0243412A4 EP 19860906242 EP19860906242 EP 19860906242 EP 86906242 A EP86906242 A EP 86906242A EP 0243412 A4 EP0243412 A4 EP 0243412A4
Authority
EP
European Patent Office
Prior art keywords
station
intertrip
supervision
voltage
relay
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Withdrawn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
EP19860906242
Other languages
German (de)
English (en)
Other versions
EP0243412A1 (fr
Inventor
Ronald James Coomer
Ah Loy Hoi
John Walton Robinson
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.)
South East Queensland Electricity Board
Original Assignee
SOUTH EAST QUEENSLAND ELECT
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 SOUTH EAST QUEENSLAND ELECT filed Critical SOUTH EAST QUEENSLAND ELECT
Publication of EP0243412A1 publication Critical patent/EP0243412A1/fr
Publication of EP0243412A4 publication Critical patent/EP0243412A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation

Definitions

  • the invention relates to an intertripping system, an intertripping station, a transformer construction and method of controlling and supervising a plurality of intertripping stations.
  • SUBSTITUTESHEET terminal and other remote terminals were coupled in series with one another and to the one remote terminal. Such systems were nqt reliable since a fault in one remote 5 terminal of the series would render all subsequent remote terminals of the series ineffective.
  • SUBSTITUTESHEET n er r pp ng s a on including output means for outputting either a supervision signal or an intertrip signal, said intertrip signal being of a level higher than the level of the supervision signal 5 isolation means between the output means and a bus onto which the signal may be supplied, a supervision sensor for determining the presence of the supervision signal and for providing an alarm in the absence of that signal, an intertrip signal sender for enabling the intertrip signal t
  • the output means of the master station may output two distinct voltage levels. In one
  • the converter may be made adjustable such that the magnitude of the two voltage levels may be adjusted as required, in one embodiment -the converter includes a pulse width 5 modulator which, together with the pulse transformer can provide the two output voltage levels referred to.
  • the slave or remote stations may be constructed essentially the same as the master station but adapted to output a supervision signal different from the supervision signal put out by the master station.
  • the supervision signals are voltages the remote station signal is of a lower level than the master station supervision signal.
  • the Q remaining features of the remote station may be the same as that for the master station.
  • the communication method used between a master station and one or more remote stations or slaves includes outputting a supervision signal onto a bus common to the master station and the or each remote station; the or each remote station outputting a supervision signal; the supervision signals enabling the master and remote stations
  • SUBSTITUTESHEET further includes applying an intertrip signal onto the bus sensing for the presence of the intertrip signal and causing the master and the remote stations to output a control 5 signal.
  • the method may employ voltage signals whereby the master supervision signal is a higher voltage level than the
  • the intertrip signal is higher in magnitude than the master supervision signal.
  • the method may include sensing that each station is providing a supervision signal. In case of the absence of such a supervision signal an alarm may be raised.
  • the core pieces have a core arm about which the windings may locate.
  • the core pieces each have a plurality of core arms - one either side of a central core arm.
  • the transformer may include one or more station blocks relative to which the ends of the windings may be terminated.
  • the station blocks are mounted to or ⁇ associated with the primary former.
  • the primary former has a winding receiving part about which the primary winding may be wound.
  • the primary winding receiving part is preferably receivable within a bore in the secondary former.
  • this part is cylindrical. It is preferred that the primary former have an end flange which may limit the extent to which the primary winding receiving part may fit within the secondary former.
  • Figure 4 is an exploded view of a pulse 10 transformer
  • Figures 5a and 5b are front and end views, respectively, of a former used in the transformer of figure * 4;
  • Figure 5c is an elevational view of a former for a 5 reed relay
  • Figure 6a is a sectional view of the transformer taken along line XX of figure 6b;
  • SUBSTITUTESHEET 12 does not form part of the invention. Master 10 may be located at a central station or substation and panel 12 is
  • the master 10 has a pulse transformer TR for providing a DC voltage at the secondary winding S.
  • the construction of the transformer TR is such that it functions as a flyback pulse transformer which is particularly suitable for use with the operation of the remainder of the
  • Diode Dl is part of the construction necessary for this type of transformer function.
  • the master 10 has an 5 -intertrip receive relay K3, an intertrip send relay K4 and an intertrip faulty alarm relay K5.
  • a source of DC power is supplied to DC supply j_ terminals.
  • the supply voltages may be either 32VDC nominal (range 26 to 36VDC) or 110VDC nominal (range 88 to 121VDC) .
  • suitable resistors Rl, R2, R19 and R2O may be placed in series with relays K3, zener diode Z2, relay K5 and relay K4 respectively.
  • Resistor R2 may be chosen as 820 ohm 5W for 32 VDC and 4K ohm 1W for 110 VDC.
  • Resistors Rl, R19 and R20 5 are not present for the lower nominal voltage and are of a selected value for the higher voltage to ensure continuous operation at this voltage.
  • Each relay K3, K4, K5. has two sets of contacts associated with it.
  • Relay K3 and K4 each have two normally open contacts whilst K5 has two normally Q closed contacts.
  • Each master 10 has a supervising link Ll in series with variable resistor VR1.
  • a slave 11 is constructed in the same fashion as a master except link Ll is not present and resistor VR1 is not necessary.
  • Diode Dl protects the transformer in the case of surges or inadvertant polarity reversal on pilot lines Pl, P2.
  • Suppressor SI may comprise a metal oxide varistor or non-linear resistor.
  • Diode D2 provides for reverse polarity protection and has its anode connected to station V+.
  • Relay K3 is connected in series with a normally open contact of relay K2 and that series connection extends between V+ and V-.
  • a flywheel or back emf protection diode D3 is connected across relay K3.
  • resistor Rl is chosen or is optional depending upon the magnitude of the--supply voltage.
  • resistors are chosen to enable a voltage of an order of magnitude lower than the intertrip signal to be applied to the pilots - that is, the supervision signal.
  • These three voltages may for example be about 2VDC, about 20 VDC and about 120 VDC. These values are arbitrary Q and the high voltage (i.e. 120 VDC) just needs to be appreciably higher than the supervision signal (20 VDC) to ensure that if one slave loses communication with the master . and the impedance seen by the master changes the resultant increase over the supervision signal magnitude is not recognised as an intertrip signal. If it were the remaining
  • the circuit is such that capacitor C3 is -discharged 5 by then.
  • Resistor R15 is a load resistor for the LED and resistor R16 is a biasing resistor for Q4.
  • Diode D5 is a flywheel diode for relay K5.
  • Resistor Rll is a bleed resistor to discharge capacitor C5 and R12 is a bias resistor for Q3. Should the supervision voltage not be on the pilots relay Kl is not energized and its normally open contact will be in its open position and relay K5 will not energize and . the "intertrip faulty" alarm is provided.
  • a master station The operation of a master station is as follows. With power on and energy being transferred to the secondary of transformer TR capacitor C2 and resistors VRl and R5 in parallel with R4 determine the frequency of operation of the PWM and hence the voltage applied to the pilots Pl, P2. When the station is functioning correctly and in the supervisory mode 20VDC is applied to the pilots, relays Kl, K5 are energized and LED is illuminated. If it is desired that the master station produce an intertrip signal to output an appropriate signal to its protection intertrip panel relay K4 is energised. This ensures that R6, C2 control the frequency of the output of the PWM and the 120 VDC intertrip signal is applied to the pilots. The magnitude of this voltage is sufficient to operate reed • re n ser es w re ay
  • a slave is similar in construction and operation to a master except that link Ll is in the position shown in figure 3 and VRl and R5 have no effect. The slave normally outputs 2VDC to the pilot and this enables the slave to check its own operation to ensure that energy is being transferred to the secondary of the transformer. This occurs in an identical fashion to that in the master.
  • a transformer is illustrated in exploded form in
  • former 34b (figure 4) locates.- In this way the windings are closely adjacent one another and in fact coaxial. This enables good coupling between the windings to be achieved.
  • the construction of bobbin 36 is such that it enables this coupling to be effected whilst still affording excellent electrical isolation between the windings.
  • the bobbin has tracking ridges 37, 39 and groove 38 at each of its ends to ensure that a large tracking distance is present between the windings to provide good isolation between them. This assists in the applicability for use of the transformer in high tension applications.
  • the transformer may be used where 15KV isolation is required. Thus, should a fault occur at the primary and 15KV be impressed on it the secondary will be suitably isolated from this fault.
  • FIG. 6a and 6b show views of an assembled 0 transformer encapsulated as shown at 62 in a potting compound which may be cast about the transformer in a • suitable mould.
  • Pins 35 project outwardly from the - assembled transformer and flashover barriers 64 are provided between the pins for electrical insulation and isolation 5 between the pins.
  • the core pieces 30, 31 are assembled to provide a gap 60 between them. This gap is necessary to ensure that the transformer operates in the flyback mode. Typically, the gap is about 0.25 mm.
  • Insulating spacers 61 ensure that core piece 31 is suitably spaced for the Q encapsulating step.
  • Fixing nuts 63 are positioned during or before encapsulation and enable the completed transformer to be suitably mounted in use.
  • SUBSTITUTE SHEET encapsulating material may comprise ARALDITE LC177 resin and LC170 hardener.
  • the flyback pulse transformer may"have its secondary short circuited without damage.
  • Figure ⁇ 5c shows an embodiment of a bobbin 50 for the reed relays Kl, K2.
  • the bobbin has a spool portion 52 with a stem 52a about which the coil of the relay may be wound. End cap 53 and head portion 54 are located adjacent opposite ends of spool portion 52. Grooves 56 are present in cap 53 and head portion 54 and assist in the location of a sleeve (not shown) which may be placed over the bobbin 50,.
  • the bobbin has a central bore 51 within which the switching component or reed of the reed relay is inserted.
  • the reed may be an Email miniature reed, catalogue number 2725.
  • Figure 7 employs a linear magnetic field sensor FS which preferably is a low temperature drift type and may be a SIEMENS SAS 231W or equivalent. Sensor FS is closely coupled with relay K2 and is able to sense the magnitude of the pilot supervision
  • SUBSTITUTESHEET • voltage.
  • Sensor FS is associated with comparator A3 which derives its inputs from a reference and from the sensor and A3 provides at output B a low level signal when the signal detected across -the pilots Tl, T2 is less than the
  • the sensor FS also provides a method of regulating the pilot supervision voltage injected onto the pilots by the master station and removes the need to adjust the pilot supervision voltage in the field by adjusting VRl of figure 3.
  • Resistor R22 limits the range of control of the
  • Resistor VR3 sets the operation threshold of sensor FS and VRS is an offset adjuster.
  • the sensor FS could also be used to sense and regulate the trip

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Poste à déclenchement interdépendant (10) d'un système de déclenchement interdépendant servant à la protection des réseaux d'alimentation de puissance et à d'autres applications où des déclenchements interdépendants isolés sont requis. Le poste est équipé de moyens de sortie (10a) pour fournir soit un signal de surveillance soit un signal de déclenchement interdépendant sur la barre omnibus du circuit de pilotage. Le signal de déclenchement interdépendant est d'un niveau supérieur à celui du signal de surveillance, et des moyens d'isolation (TR) sont prévus entre les moyens de sortie et la barre omnibus. Le poste comporte un capteur de surveillance (K1) pour détecter la présence d'un signal de surveillance et pour fournir une alarme (4, 5) en l'absence de ce signal. Un émetteur de signal de déclenchement interdépendant (K4) est également fourni pour permettre aux moyens de sortie de fournir un signal de déclenchement interdépendant, et le poste comporte également un capteur de déclenchement (K2) pour détecter la présence d'un signal de déclenchement interdépendant sur la barre omnibus et pour fournir une fonction de commande de déclenchement au niveau du poste.
EP19860906242 1985-10-31 1986-10-30 Poste a declenchement interdependant. Withdrawn EP0243412A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPH318885 1985-10-31
AU3188/85 1985-10-31

Publications (2)

Publication Number Publication Date
EP0243412A1 EP0243412A1 (fr) 1987-11-04
EP0243412A4 true EP0243412A4 (fr) 1990-02-21

Family

ID=3771351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860906242 Withdrawn EP0243412A4 (fr) 1985-10-31 1986-10-30 Poste a declenchement interdependant.

Country Status (4)

Country Link
EP (1) EP0243412A4 (fr)
JP (1) JPS63501610A (fr)
KR (1) KR880700514A (fr)
WO (1) WO1987002836A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2276150A (en) * 1939-06-13 1942-03-10 Westinghouse Electric & Mfg Co Pilot wire supervision
GB741423A (en) * 1952-07-24 1955-12-07 Gen Electric Co Ltd Improvements in or relating to electric protective systems
US3866086A (en) * 1972-06-28 1975-02-11 Matsushita Electric Ind Co Ltd Flyback transformer apparatus
JPS6046615B2 (ja) * 1977-06-13 1985-10-17 東京電力株式会社 保護制御装置
JPS55151307A (en) * 1979-05-14 1980-11-25 Victor Co Of Japan Ltd Closed magnetic circuit device
GB2098417B (en) * 1981-05-09 1984-10-24 Northern Eng Ind Pilot wire line protection systems
DE3222027A1 (de) * 1982-06-11 1983-12-15 Siemens AG, 1000 Berlin und 8000 München Elektrischer uebertrager
US4549130A (en) * 1983-07-12 1985-10-22 International Business Machines Corporation Low leakage transformers for efficient line isolation in VHF switching power supplies
NL8401185A (nl) * 1984-04-13 1985-11-01 Philips Nv Transformator met coaxiale spoelkokers.

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Brown Boveri Mitteilungen, Vol. 58, No. 7, July 1971, pages 293-304, Baden, CH; H. UNGRAD: "Distanzrelais mit Signaluebertragung als Grund- und Reserveschutz von Leitungen", page 295, left-hand column, paragraph 2 - page 296, left-hand column, paragraph 1; figures 2,3. *
See also references of WO8702836A1 *

Also Published As

Publication number Publication date
KR880700514A (ko) 1988-03-15
WO1987002836A1 (fr) 1987-05-07
EP0243412A1 (fr) 1987-11-04
JPS63501610A (ja) 1988-06-16

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Inventor name: ROBINSON, JOHN, WALTON

Inventor name: COOMER, RONALD, JAMES

Inventor name: HOI, AH, LOY