US1873959A - Overload protective system with resistance operated relay - Google Patents

Overload protective system with resistance operated relay Download PDF

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Publication number
US1873959A
US1873959A US755581A US75558124A US1873959A US 1873959 A US1873959 A US 1873959A US 755581 A US755581 A US 755581A US 75558124 A US75558124 A US 75558124A US 1873959 A US1873959 A US 1873959A
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United States
Prior art keywords
relay
time
resistance
current
circuit
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Expired - Lifetime
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US755581A
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English (en)
Inventor
Frey Ernst Hermann
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BBC Brown Boveri AG Germany
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Bbc Brown Boveri & Cie
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    • 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
    • H02H7/30—Staggered disconnection

Definitions

  • relays In the case of overload protective systems which are to operate selectively, relays whose operation depends upon the magnitude of the resistance in the defective part of the line are I frequently used to determine the tripping time delay. In the case of short circuits, such relays cause those switches which are nearest to the point where the short circuit occurs to operate first. As, however, the relays should of course operate only when a short circuit occurs, they are commonly used in combination with auxiliary relays operating responsively to a function of the current. When a certain pre-determined current is ex- 16 ceeded, such an auxiliary relay might, for
  • the resistance dependent relays may be provided with a second contact, in addition to the tripping contact proper, which is actuated as soon as the line resistance (upon which the action of the relay depends) has reached a certain value, and which closes the circuit and causes a relay having a definite time limit to operate. After the elapse of a time limit determined by the setting of the resistance dependent relay, this definite time limit relay is allowed to actuate the tripping contact in the well known manner.
  • the drawing illustrates diagrammatically one way of arranging the relays and their connections for carrying the invention into effect.
  • a and b are movable coils connected to each other and fixed on shaft 10
  • c is the fixed coil of a relay device j designed on the principle of an ohmmeter
  • d is the switch, the time lag in the operation of which is set by the relay, and which serves to cut out the line section 6.
  • the coils a and 0 are supplied by the current transformer f through which passes the current flowing in this section, the coil 12 being supplied by voltage prevailing in the section via the voltage transformer g.
  • the supporting shaft 10 of the coils a and I) carries two contact devices, viz. the cam or element h and the contact arm Z.
  • a time limit relay device is comprises the member 11 carrying contacts 71 and which is rotated in the direction of the arrow 12 at a uniform rate on the pivot or spindle 13 by suitable clock mechanism or the equivalent, the latter being released, upon excitation of the electromagnet m, by any suitable means such as the interlock designated generally by reference numeral 1 1-.
  • the relay device 7' is responsive to the impedance of the line section 6, and upon occurrence of fault such as a short-circuit operates to rotate or adjust the angular position of the element or cam h in the direction of the arrow 15 and in amount inversely proportional to the impedance, or in other words, inversely proportional to the distance from the switch or breaker (Z to the point of the fault.
  • the element or cam b will be positioned correspondingly further to the right to permit of engagement of contacts 11 with the cam within a correspondingly smaller period of time from the instant of releasing action of interlock 14, in the manner and for the purpose hereinafter explained.
  • the contact arm Z may either lie against the spring supported contact 9, or the spring supported contact p, or be allowed to move freely in the space between the two contacts.
  • the relay Under normal line conditions, the relay is either in the position where the contact Z touches the opposite contact p (with current in positive direction) or in the position where the contact Z touches the opposite contact 9 (with reverse current). Consequently one of the two parallel connected contacts p and g is always closed. If, however, a short circuit occurs, the resistance dependent relay device j moves to 'a position where the contact Z does not touch either of the two counter-contacts p and g, as shown, and changes the angular position of cam 7?. to the right by an amount inversely.
  • A. selectivelyacting protective device including a resistance, dependent relay and a delay action relaycharacterized by the fact that the resistance dependent relay both sets into operation and regulates the time lag of the delayedaction relay.
  • a protective'relay device for said line comprising a relay element responsive to the l ne impedance, and a. time-delay element, said impedance-responsive element controlling the initiation of the action of said time-delay element and the time lag of saidtime-delay element.
  • a protective relay device comprising an impedance-responsive relay element, and a time-dela relay element, said impedance responsive element controlling the initiation of the action of said time-delay element and the time delay efiected thereby.
  • control circuit terminals In a protective relay device, control circuit terminals, a time-delay action relay element for operating said control circuit ter- 1 .aninals, and an impedance-respons1ve relay element for initiating the action of said timeof its action on said control circuit terminals.
  • a protective system the combination of a line, a control circuit therefor, a protective relay device for operating said control circuit, an element responsive tothe impedance of said lineforinitiating the action of said relay device on occurrence of predetermined line impedance conditions, and means responsiveto said impedance as determined by said element for determining the time lag required to carry out the control operation of said relay device on said control circuit.
  • an electrical transmission I line a circuit: breaker therefor, a time-delay element, an actuating element for initiating movement of the ti1ne-delay element to control actuation ofsaid circuit breaker, and means for determining the length of time during which said time-delayelement moves from the moment of initiation of its movement to the carrying out of the same, the operation of said actuating element and said means being responsive to the ratio of the line voltage to the line current, and the rate of move-H ment of thesaid time-delay element being in dependent of said actuating element and said means.
  • a relay including relatively movable cooperating members, and. means for controlling said members including an ohmmeter, a timing element, and ohmmetrically controlled means for controlling the starting of said timing element.
  • an electrical transmission line a circuit 1 breaker therefor, a time-delay element, an element operable to control initiation of movement of'said time-delay elementto control actuation of said circuit breaker, means, i for determining the length of time during'ilo which said time-delay element moves from the moment of initiation of movement thereof to the carryingout ofthe same, and an element actuated responsive to and in depend-, encesolely on the ratio ofvoltage to current of said line. for operating saidmeans and for causing operation of the second said element. 7 l
  • V 9 Ina system of the character described, an electrical transmission line, a circuit flbreaker therefor, a time-delay element, an

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Breakers (AREA)
US755581A 1923-12-15 1924-12-12 Overload protective system with resistance operated relay Expired - Lifetime US1873959A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE1873959X 1923-12-15
DE590463X 1923-12-15
DE111649X 1923-12-15
DE226240T 1923-12-15

Publications (1)

Publication Number Publication Date
US1873959A true US1873959A (en) 1932-08-30

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ID=66099955

Family Applications (1)

Application Number Title Priority Date Filing Date
US755581A Expired - Lifetime US1873959A (en) 1923-12-15 1924-12-12 Overload protective system with resistance operated relay

Country Status (4)

Country Link
US (1) US1873959A (enrdf_load_stackoverflow)
CH (1) CH111649A (enrdf_load_stackoverflow)
FR (1) FR590463A (enrdf_load_stackoverflow)
GB (1) GB226240A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
CH111649A (de) 1925-09-01
FR590463A (fr) 1925-06-17
GB226240A (enrdf_load_stackoverflow) 1925-12-31

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