US3629658A - Static impedance relay - Google Patents

Static impedance relay Download PDF

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Publication number
US3629658A
US3629658A US35504A US3629658DA US3629658A US 3629658 A US3629658 A US 3629658A US 35504 A US35504 A US 35504A US 3629658D A US3629658D A US 3629658DA US 3629658 A US3629658 A US 3629658A
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Prior art keywords
voltage
circuit
pulsating
proportional
secondary winding
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Expired - Lifetime
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US35504A
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English (en)
Inventor
Anders Helge
Torkel Johansson
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ABB Norden Holding AB
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ASEA AB
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    • 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
    • H02H3/40—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 ratio of voltage and current

Definitions

  • ABSTRACT A static impedance relay for controlling a circuit [54]
  • STATIC IMPEDANCE RELAY includes a switch operated by a relay coil which is connected to a zero detector. The zero detector is fed with a first pulsat- 4 Claims, 10 Drawing Figs.
  • the present invention relates to a static impedance relay having great possibilities of variation for the adjustment of various qualities, as well as having an extremely short operating time.
  • the relay comprises a current circuit, a voltage circuit and a zero detector connected to both circuits, the current circuit being arranged to generate a pulsating voltage which is proportional to the current supplied.
  • the invention is characterized in that the voltage circuit comprises a first circuit to generate a direct voltage which proportional to the voltage supplied and a second circuit to generate a second, pulsating voltage which is proportional to the voltage supplied, and a means to summate the two voltages.
  • FIGS. 1 and 3 shown connection diagrams for two slightly different variations of the invention.
  • FIG. 2a shows some examples of different operating curves which can be obtained with the connection according to FIG. 1.
  • FIG. 2b shows how an oval operating curve has been turned in the impedance plane by known means.
  • FIG. 4a shows a circular operating curve obtained with the connection according to FIG. 3.
  • FIGS. 4b and 4c respectively, show voltages from the current circuit and voltage circuit of the case shown in FIG. 4a.
  • FIG. 5a shown a circular operating curve with displaced center point
  • FIGS. 5b and 5c shows the voltages from the current and voltage circuits respectively for the latter case.
  • FIG. 1 The embodiment of the invention shown in FIG. 1 has a transformer l with primary winding 2 and secondary winding 3.
  • the primary winding is connected by terminals 4 and 5 to the current transformer(s) of the object to be protected, and a current I flows through it.
  • the ends of the secondary winding have connection terminals 6 and 7 also a number of extra outputs 8, 9, located between them, whereby the conversion ratio of the transformer can be varied.
  • a rectifier bridge 10 is connected to the secondary winding and connected over the DC output of the bridge is a resistor 11 between the points 12 and 13.
  • the part of the impedance relay described here forms the current circuit mentioned in the introduction.
  • the impedance relay according to the invention also has a voltage circuit including a second transformer with a primary winding 2land two secondary windings 22, 23.
  • the primary winding 21 is connected by means of two terminals 24, 25 to the voltage transformer(s) of the object to be protected and is fed with the voltage U.
  • the secondary winding 22' has two end terminals 26, 27 and also a central output 28.
  • phase-turning circuit consisting of a resistor 50 and a capacitor 51.
  • the three outputs are connected bymeans of conduits 29, 30 and 31 to the center points 32, 33, 34, in individual branches of a rectifier connection 35.
  • the positive pole of the rectifier connection is connected over a resistor 36 to a point 37 in the relay connection.
  • the negative pole of the rectifier connection is connected to another point 38.
  • a capacitor 39 is connected between the two poles of the rectifier connection to equalize any ripple voltage.
  • a resistor 14 is connected between the points 37 and 38.
  • the second secondary winding 23 has two end terminals 40 ad 41 and also a number of intermediate outputs 42 so that the voltage taken out from the winding 23 can be varied stepwise from zero to a maximum value.
  • a rectifier bridge 43 has its AC outputs connected to the secondary winding whereas the DC outputs are connected over a resistor 44 to the end points of the resistor 14.
  • a capacitor 45 may be connected in the feeding circuit to the rectifier bridge 43 if an alternation of the phase position is desired and thus an alteration of the operating conditions to the really.
  • the momentary value of the voltage between points 12 and 37 is sensed by a zero detector 15.
  • This voltage consists of the difference between the voltage over the resistor 11, which is proportional to the current I, and the voltage over the resistor 14, which is proportional to he voltage U.
  • the zero detector emits an output signal which closes the relay 17 when the temporary value of the voltage between the points 12 and 37 is greater than zero.
  • the rectifier connection 35 gives a direct voltage across the resistor 14 which is proportional to the voltage U.
  • the current circuit produces over the resistor 11 a first pulsating direct voltage proportional to the current I.
  • These two voltages give the impedance relay a circular operating curve which is shown by the circle 46 in FIG. 2a. This is assuming the voltage taken out from the secondary winding 23 is zero. If, on the other hand, a voltage is also taken out from the secondary winding 23, a second pulsating direct voltage obtained from the rectifier bridge 43 is supplied to the resistor 14, and the second pulsating voltage is added to the direct voltage from rectifier 35.
  • FIG. 2a shows the appearance of the operating curve for a certain value of the voltage from the secondary winding 23 and a certain value of the capacitance of the capacitor 45.
  • the embodiment of the invention shown in FIG. 3 differs from that shown in FIG. 1 in two aspects.
  • the rectifier bridge 10 in the current circuit is replaced by a one-way rectifier or valve 19 so that the voltage arising over the resistor 11 has the appearance shown in FIG. 4b.
  • the rectifier bridge 43 is omitted so that the voltage arising across the resistor 14 is an alternating voltage insofar as any voltage is taken out from the secondary winding 223.
  • the voltage circuit achieved according to the invention thus makes it possible in an extremely simple manner to influence the operating curve of the relay in several respects so that the relay can be used for different purposes.
  • Static impedance relay comprising a current circuit, a voltage circuit and a zero detector connected to both circuits, the current circuit including means to generate a first pulsating voltage which is proportional to the current supplied, the voltage circuit comprising a first circuit part including means to generate a direct voltage which is proportional to the voltage supplied and a second circuit part including means to generate a second pulsating voltage which is proportional to the voltage supplied, means to form the algebraic sum of the direct and second pulsating voltages, said zero detector connected to be responsive to the difference between the absolute values of said first pulsating voltage and said sum.
  • Impedance relay according to claim 1, the current circuit comprising a full-wave rectifier (l0), and the means for generating the second pulsating voltage comprising a fullwave rectifier (43).
  • Impedance relay according to claim 1, the current circuit comprising a half-wave rectifier (l9), and the means to generate the second pulsating voltage including means to generate an alternating voltage.
  • the voltage circuit includes a voltage transformer (20) having a primary winding 21) and a first and a second secondary winding (22, 23), the first circuit part being connected to the first secondary winding and the second circuit part connected to the second secondary winding, the second secondary winding having a plurality of outputs (40, 41, 42) to adjust the desired amplitude of the second pulsating voltage.

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  • Measurement Of Current Or Voltage (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
US35504A 1969-05-08 1970-05-07 Static impedance relay Expired - Lifetime US3629658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE06507/69A SE330930B (enrdf_load_stackoverflow) 1969-05-08 1969-05-08

Publications (1)

Publication Number Publication Date
US3629658A true US3629658A (en) 1971-12-21

Family

ID=20268860

Family Applications (1)

Application Number Title Priority Date Filing Date
US35504A Expired - Lifetime US3629658A (en) 1969-05-08 1970-05-07 Static impedance relay

Country Status (7)

Country Link
US (1) US3629658A (enrdf_load_stackoverflow)
CH (1) CH530102A (enrdf_load_stackoverflow)
FR (1) FR2042480B1 (enrdf_load_stackoverflow)
GB (1) GB1299933A (enrdf_load_stackoverflow)
NO (1) NO125608B (enrdf_load_stackoverflow)
SE (1) SE330930B (enrdf_load_stackoverflow)
YU (1) YU32440B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958153A (en) * 1973-06-07 1976-05-18 Brown, Boveri & Co., Ag Method and apparatus for fault detection in a three-phase electric network
US4636909A (en) * 1984-02-01 1987-01-13 Asea Aktiebolag Digital impedance relay
EP0244649A1 (en) * 1986-04-08 1987-11-11 Asea Ab Method and device for protecting a power tramsmission line

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495166A (en) * 1945-12-29 1950-01-17 Westinghouse Electric Corp Distance-type relay with limited directional discrimination
US3543092A (en) * 1967-09-22 1970-11-24 English Electric Co Ltd Distance relays

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE685594C (de) * 1933-07-08 1939-12-27 Aeg Schutzrelais fuer elektrische Wechselstromanlagen mit zeitabhaengiger Ausloesung
FR1051922A (fr) * 1951-03-28 1954-01-20 Relais à faible impédance pour la protection à distance
US2981867A (en) * 1957-10-25 1961-04-25 Gen Electric Electric relay
FR1347586A (fr) * 1963-02-19 1963-12-27 Bbc Brown Boveri & Cie Dispositif de protection avec montage en pont à redresseurs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495166A (en) * 1945-12-29 1950-01-17 Westinghouse Electric Corp Distance-type relay with limited directional discrimination
US3543092A (en) * 1967-09-22 1970-11-24 English Electric Co Ltd Distance relays

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958153A (en) * 1973-06-07 1976-05-18 Brown, Boveri & Co., Ag Method and apparatus for fault detection in a three-phase electric network
US4636909A (en) * 1984-02-01 1987-01-13 Asea Aktiebolag Digital impedance relay
EP0244649A1 (en) * 1986-04-08 1987-11-11 Asea Ab Method and device for protecting a power tramsmission line
US4731688A (en) * 1986-04-08 1988-03-15 Asea Ab Range limitation for a protection device in a power supply network

Also Published As

Publication number Publication date
FR2042480B1 (enrdf_load_stackoverflow) 1974-07-12
DE2022150B2 (de) 1973-04-12
YU115170A (en) 1974-04-30
YU32440B (en) 1974-10-31
FR2042480A1 (enrdf_load_stackoverflow) 1971-02-12
SE330930B (enrdf_load_stackoverflow) 1970-12-07
NO125608B (enrdf_load_stackoverflow) 1972-10-02
DE2022150A1 (de) 1970-11-19
CH530102A (de) 1972-10-31
GB1299933A (en) 1972-12-13

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