US3733520A - Means for limiting the residual level during superimposed over-voltage conditions in a surge diverter - Google Patents

Means for limiting the residual level during superimposed over-voltage conditions in a surge diverter Download PDF

Info

Publication number
US3733520A
US3733520A US3733520DA US3733520A US 3733520 A US3733520 A US 3733520A US 3733520D A US3733520D A US 3733520DA US 3733520 A US3733520 A US 3733520A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
diverter
over
gap
voltage
spark
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.)
Expired - Lifetime
Application number
Inventor
A Schei
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.)
ASEA AB
Original Assignee
ASEA AB
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
Grant date

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20Emergency 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 excess voltage
    • H02H3/22Emergency 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 excess voltage of short duration, e.g. lightning
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01TSPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00Overvoltage arresters using spark gaps
    • H01T4/16Overvoltage arresters using spark gaps having a plurality of gaps arranged in series
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/06Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

Abstract

In a surge diverter, in order to limit the residual level during superimposed over-voltage conditions, a plurality of spark gap stacks with associated non-linear resistors are provided with a shunt spark gap shunting at least one spark gap stack with the associated non-linear resistor. A shunt impedance is provided shunting at least one spark gap stack which is shunted by the shunt spark gap. The surge diverter includes a sufficient number of shunt gaps to prevent the total voltage over the diverter upon super-imposed over-voltage conditions from exceeding the protection level of the diverter.

Description

ilnited States Patent 1191 Schei 1 May 15, 1973 [54] MEANS FOR LIMITING THE [56] References Cited RESIDUAL LEVEL DURING UNITED STATES PATENTS SUPERIMPOSED OVER-VOLTAGE 3,489,949 1/1970 Carpenter ..3I7/69 X CONDITIONS IN A SURGE DIVERTER 3,673,459 6/1972 Carpenter ..3l5/36 3,348,100 10/1967 Kres e l ..3l7/70 [75] Invent Asle sch", Ludvlka, Sweden 3,414,759 12/1968 Conn ell et a1. ....317 70 x Assignee: Aumanna Svenska Elektriska 3,413,524 11/1968 Tram ..3]7/69 tlebolaget Vasteras Sweden Primary ExaminerC. L. Albritton [22] Filed: Apr. 28, 1972 Attorney-Jennings Bailey, Jr. [21] App]. No.: 248,601 ABSTRACT In a surge diverter, in order to limit the residual level [30] Foreign Application Priority Data during superimposed over-voltage conditions, a plurality of spark gap stacks with associated non-linear May 3, 1971 Sweden ..5673/71 resistors are provided with a Shunt spark p shunting at least one spark gap stack with the associated non- CL 317/70, linear resistor. A shunt impedance is provided shunt- 338/2] ing at least one spark gap stack which is shunted by [51] Int. Cl. ..H02h l/00 the shunt spark gap. The surge diverter includes a suf- [58] Field of Search ..338/2l, 13, 20; ficient number of shunt gaps to prevent the total voltage over the diverter upon super-imposed over-voltage conditions from exceeding the protection level of the diverter.

4 Claims, 7 Drawing Figures I MEANS FOR LIMITING THE RESIDUAL LEVEL DURING SUPERIMPOSED OVER-VOLTAGE CONDITIONS IN A SURGE DIVERTER BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a means for limiting the residual level during super-imposed over-voltage conditions in a surge diverter.

2. The Prior Art A surge diverter in an electric power line may under certain conditions during the extinguishing interval of the diverter be subjected to superimposed overvoltages or over-voltages superimposed on the operating voltage. Such conditions are most likely to appear in equipment for high voltage direct current and may occur when different diverters in the equipment ignite at different moments. An example of this is when a diverter for a converter-rectifier sparks-over while a phase-earth diverter discharges a connection overvoltage from the AC side. The phase-earth diverter is then connected to the DC line over the diverter of the converter-rectifier, thus causing a current increase in the phase-earth diverter. At the moment when the diverter over the converter-rectifier is ignited, the phaseearth diverter may very well operate with arcs extended by a magnetic field and under such conditions normal diverters do not give sufficient protection.

SUMMARY OF THE INVENTION The present invention relates to a means for surge diverters, preferably in equipment for high voltage direct current, to limit the residual level during superimposed over-voltage conditions.

According to the invention, in a surge diverter, in order to limit the residual level during super-imposed over-voltage conditions, a plurality of spark gap stacks with associated non-linear resistors are provided with a shunt spark gap shunting at least one spark gap stack with the associated nonlinear resistor. A shunt impedance is provided shunting at least one spark gap stack which is shunted by the shunt spark gap. The surge diverter includes a sufficient number of shunt gaps to prevent the total voltage over the diverter upon superimposed over-voltage conditions from exceeding the protection level of the diverter.

BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings FIGS. 1, 2 and 3 show three different embodiments of the invention and FIG. 4 shows the total discharge current through the surge diverter as a function of the time;

FIGS. 5 and 6 show the voltage over the non-linear valve-resistors and the voltage over the spark gap in a phase-earth diverter, for example;

FIG. 7 shows the total voltage over the diverter as a function of the time. The four latter figures show the conditions during super-imposed over-voltage conditrons.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A surge diverter according to FIGS. 1, 2, and 3 comprises a number of spark gap stacks 1 alternating with non-linear valve-resistors 2. Parallel therewith is a control chain with control impedances 3. The figures only show part of a diverter.

In order for the diverter to be able to protect even under the conditions mentioned during super-imposed over-voltages, it is now proposed that a number of gapplus-block units are shunted with an extra spark gap, shunt gap,4. FIG. 1 shows two gap stacks and a resistor being shunted, whereas FIG. 2 shows the case in which the shunt gap bridges a gap stack and a resistor. In FIG. 3 the valve-resistor 2 is a part of the control chain. Other combinations are of course also possible. In view of the ability of the diverter to limit the ensuing current it is advisable to use gaps with magnetic blowing for the shunt gaps as well. In the examples shown in FIGS. 1 and 3 it is preferable to shunt one of the spark gap stacks l shunted by the spark gap 4, with a shunt impedanceS. The spark-over voltage of the shunt gap 4 is chosen so high that it does not fire during normal over-voltages but only when such superimposed overvoltages occur as might jeopardize the protective capacity of the diverter. The number of shunts necessary for a certain diverter may vary from time to time and can be determined so that the diverter can ensure the necessary protection level.

FIG. 4 shows the current as a function of the time in a phase-earth diverter,for example. At the time t 0 the phase-earth diverter sparks-over and the current increases to its maximum value, after which it decreases in the normal manner. At the time 2,, however, a converter-rectifier diverter sparks-over so that the DC line is connected to earth over the two diverters in series, the current increasing almost instantaneously to a high value and then decreasing.

FIG. 5 shows the corresponding sequence for the voltage U,, over the resistance block in the first sparked-over phase-earth diverter. At the time t, a voltage peak appears. In the same way, FIG. 6 shows the voltage over the gap stacks. From a low value immediately after the gaps have sparked-over the gap voltage increases as the arcs are extended because of the magnetic blowing. However, here also a strong voltage peak occurs at the time t when the second diverter sparks-over.

FIG. 7 shows the voltage U,, over the phase-earth diverter, this voltage being U,, U

In the last three figures the protection level U of the diverter is indicated by a broken line and from FIG. 7 it is clear that the total voltage over the diverter exceeds its protection level, so that the diverter is not capable of protecting the equipment.

If according to the invention some of the spark gaps and valve-resistor blocks are shunted with extra gaps, this means that part of the voltage peak occuring at the time t in FIGS. 5 and 6 can be removed. The number of shunt gaps is chosen so that the voltage peak at t shown in FIG. 7 is kept under the line U,,.

I claim:

1. In a surge diverter, means to limit the residual level during superimposed over-voltage conditions, said means comprising a plurality of spark gap stacks (1) with associated serially connected non-linear resistors, and a shunt spark gap shunting at least one spark gap stack (1) with the associated non-linear resistor (2).

2. In a device according to claim 1, said shunt spark gap shunting two spark gap stacks (1) having a nonlinear resistor (2) connected therebetween.

3,733,520 3 4 3. In a device according to claim 1, having a shunt vent total voltage (U over the diverter upon superimpedance (5) shunting at least one Spark gap Smck imposed over-voltage conditions from exceeding the (1) which is shunted by the shunt spark gap.

4. In a device according to claim 1, the surge diverter includes a sufficient number of shunt gaps (4) to pre- 5 protection level (U,,) of the diverter.

Claims (4)

1. In a surge diverter, means to limit the residual level during superimposed over-voltage conditions, said means comprising a plurality of spark gap stacks (1) with associated serially connected non-linear resistors, and a shunt spark gap shunting at least one spark gap stack (1) with the associated non-linear resistor (2).
2. In a device according to claim 1, said shunt spark gap shunting two spark gap stacks (1) having a non-linear resistor (2) connected therebetween.
3. In a device according to claim 1, having a shunt impedance (5) shunting at least one spark gap stack (1) which is shunted by the shunt spark gap.
4. In a device according to claim 1, the surge diverter includes a sufficient number of shunt gaps (4) to prevent total voltage (Ua) over the diverter upon super-imposed over-voltage conditions from exceeding the prOtection level (Un) of the diverter.
US3733520A 1971-05-03 1972-04-28 Means for limiting the residual level during superimposed over-voltage conditions in a surge diverter Expired - Lifetime US3733520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE567371 1971-05-03

Publications (1)

Publication Number Publication Date
US3733520A true US3733520A (en) 1973-05-15

Family

ID=20266970

Family Applications (1)

Application Number Title Priority Date Filing Date
US3733520A Expired - Lifetime US3733520A (en) 1971-05-03 1972-04-28 Means for limiting the residual level during superimposed over-voltage conditions in a surge diverter

Country Status (3)

Country Link
US (1) US3733520A (en)
CA (1) CA986574A (en)
DE (1) DE2218962A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029997A (en) * 1973-12-21 1977-06-14 Siemens Aktiengesellschaft Surge voltage arrester arrangement
US4174530A (en) * 1978-01-20 1979-11-13 General Electric Company Voltage surge arrester device
US4472754A (en) * 1981-07-31 1984-09-18 Hitachi, Ltd. Surge arrester with a bypass gap
US20090046406A1 (en) * 2007-08-15 2009-02-19 Leviton Manufacturing Company Inc. Overvoltage device with enhanced surge suppression
US7907371B2 (en) 1998-08-24 2011-03-15 Leviton Manufacturing Company, Inc. Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture
US8599522B2 (en) 2011-07-29 2013-12-03 Leviton Manufacturing Co., Inc. Circuit interrupter with improved surge suppression
US9709626B2 (en) 2008-01-29 2017-07-18 Leviton Manufacturing Company, Inc. Self testing fault circuit apparatus and method
US9759758B2 (en) 2014-04-25 2017-09-12 Leviton Manufacturing Co., Inc. Ground fault detector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348100A (en) * 1965-03-22 1967-10-17 Gen Electric Sparkover control circuit for lightning arrester shunt gap unit
US3413524A (en) * 1964-07-14 1968-11-26 English Electric Co Ltd Apparatus for providing a protective spark gap for a d.c. powerline
US3414759A (en) * 1966-12-01 1968-12-03 Ohio Brass Co Spark gap unit for lightning arresters
US3489949A (en) * 1967-11-13 1970-01-13 Gen Electric Lightning arrester with main and preionizing gaps
US3673459A (en) * 1970-11-18 1972-06-27 Gen Electric Two-wire preionizer for surge voltage arresters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413524A (en) * 1964-07-14 1968-11-26 English Electric Co Ltd Apparatus for providing a protective spark gap for a d.c. powerline
US3348100A (en) * 1965-03-22 1967-10-17 Gen Electric Sparkover control circuit for lightning arrester shunt gap unit
US3414759A (en) * 1966-12-01 1968-12-03 Ohio Brass Co Spark gap unit for lightning arresters
US3489949A (en) * 1967-11-13 1970-01-13 Gen Electric Lightning arrester with main and preionizing gaps
US3673459A (en) * 1970-11-18 1972-06-27 Gen Electric Two-wire preionizer for surge voltage arresters

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029997A (en) * 1973-12-21 1977-06-14 Siemens Aktiengesellschaft Surge voltage arrester arrangement
US4174530A (en) * 1978-01-20 1979-11-13 General Electric Company Voltage surge arrester device
US4472754A (en) * 1981-07-31 1984-09-18 Hitachi, Ltd. Surge arrester with a bypass gap
US7907371B2 (en) 1998-08-24 2011-03-15 Leviton Manufacturing Company, Inc. Circuit interrupting device with reset lockout and reverse wiring protection and method of manufacture
US8054595B2 (en) 1998-08-24 2011-11-08 Leviton Manufacturing Co., Inc. Circuit interrupting device with reset lockout
US8130480B2 (en) 1998-08-24 2012-03-06 Leviton Manufactuing Co., Inc. Circuit interrupting device with reset lockout
US20090046406A1 (en) * 2007-08-15 2009-02-19 Leviton Manufacturing Company Inc. Overvoltage device with enhanced surge suppression
US7697252B2 (en) 2007-08-15 2010-04-13 Leviton Manufacturing Company, Inc. Overvoltage device with enhanced surge suppression
US9709626B2 (en) 2008-01-29 2017-07-18 Leviton Manufacturing Company, Inc. Self testing fault circuit apparatus and method
US8599522B2 (en) 2011-07-29 2013-12-03 Leviton Manufacturing Co., Inc. Circuit interrupter with improved surge suppression
US9759758B2 (en) 2014-04-25 2017-09-12 Leviton Manufacturing Co., Inc. Ground fault detector

Also Published As

Publication number Publication date Type
CA986574A (en) 1976-03-30 grant
DE2218962A1 (en) 1972-12-07 application
CA986574A1 (en) grant

Similar Documents

Publication Publication Date Title
US3512045A (en) Ground fault responsive apparatus for electric power distribution apparatus
US4630163A (en) Method and apparatus for a transient-suppression network
US3934175A (en) Power surge protection system
US4870528A (en) Power line surge suppressor
US4164772A (en) AC fault current limiting circuit
US4389695A (en) Equipment for protecting electronic equipment and personnel against inadvertent occurrence of extended or transient high voltages and method
US5995352A (en) Ignition apparatus and method
US4903161A (en) Surge suppression for low voltage signal circuits
US5323289A (en) Lightning protection for field mounted instruments
US5023746A (en) Suppression of transients by current sharing
US4901183A (en) Surge protection device
US5388022A (en) Auto reset circuit breaker
US4675772A (en) Protector network for A-C equipment
US5440441A (en) Apparatus for protecting, monitoring, and managing an AC/DC electrical line or a telecommunication line using a microprocessor
US4998098A (en) Overvoltage detector to indicate voltage to a remote monitor
US4432029A (en) Protective means for series capacitors
US4878145A (en) Surge/transient protector for a plurality of data lines
US3947726A (en) Reverse voltage surge protection for high-voltage thyristors
US3809959A (en) Circuit interrupting means for high-voltage direct current
US4802055A (en) Transient voltage surge suppressor
US5854730A (en) Transient and voltage surge protection system and method for preventing damage to electrical equipment
US5617288A (en) Automatic surge suppressor disconnect protection system
US4174530A (en) Voltage surge arrester device
US3737725A (en) Circuit overvoltage protector
US4922366A (en) Meltable conductor to be used in series with voltage suppressors