DD140802A1 - ARRANGEMENT FOR CONTINUOUS ARC DETECTION IN SECONDARY SWITCHGEAR - Google Patents

Abstract

The arrangement disclosed in the description of the invention for detecting arc faults in encapsulated switchgear offers the possibility of locating the arc fault in a compartment or partition section of a switchgear panel and detecting it in a time of less than 10 ms. This is achieved by using the arc radiation, preferably in the spectral range of thermal radiation, as the detection variable, guiding a portion of the light radiation out of the live area via fiber optic cables and feeding it to an optoelectronic converter, at whose output a further-processable electrical signal can be taken when an arc fault is present. In pressurized gas-insulated switchgear panels, the introduction of a fiber optic cable into the enclosure is possible via a flameproof screw connection or a cast-in or glued-in fitting. The use of several light cables for the same room to be protected allows the safe avoidance of blind spots. By applying the solution according to the invention for arc fault detection in encapsulated switchgear, the extent of damage in the event of arc faults and the repair time are reduced.

Description

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Field of application of the invention

The invention relates to an arrangement for arc fault detection in encapsulated switchgear installations, in particular in switchgear installations with gaseous isolating mediums.

Characteristic of the Known Technical Solutions A known method for detecting StöriichtbÖgen in encapsulated switching cells _s in particular in the MS area looks at the utilization dor caused by Lichthogeneinwirkung pressure increase in a switching cell «. By dsn overpressure Druckentlasΐungs · flap is opened, which in turn mechanically operated a plunger switch

Upper contacts the Stößeltastors ex'folgt the through-connection of a Schuttstromkreise3 "Naob.teile this Stöi'lichtbogenerfassung consist _dariii} that

Giechanischo Übor'tragungsglieder required vjorden, due to a high mechanical !: stress in a relatively short time Yerschleißersoheinungea subjected ε ind

In short periods of time the ability to operate

The Stöx'lichtbogcoGrfasRiing are overrun in the meantime, but for the sake of work, for the sake of the outside world

, bstriobnahtna at least ·? a pig's milkbeel

if necessary, the entire system has to be installed _e In the case of arcing faults of lower currents, the ¥ irk principle is not applicable *

a time delay between the occurrence of the arc fault and its detection of at least 1o ms

arises »·

A further known method is to use the current intensity of the arc fault current as a criterion for arc detection (busbars "diff erentials cliutz) ₆

The disadvantage of this method is that a comparison of all incoming and outgoing flows are made nius, vas leads in switchgear with large number of switching cells to a very high cost, since the detection of the current flow including the directional comparison must be made in each individual switching cell (Reference "Manual Switchgear - Relay Protection)" An indication of the location of the fault arc generation is not possible due to the detection criteria. Similar considerations apply to the query protection (NV 9067/71 λΊ5Β Energiekombinat Ost Dresden - EV-'K.-M «Stadt Title J Sarmannschienenlichtbogensehutz

On the basis of an electrical detection of Störliohtbogenstronistärke continues to use the use of distance relay in the energy supply cells. The disadvantage of this principle is that in multiple feed cells, a high relais-technical effort required .ist and a selectivity of the protection 'not always guaranteed' been can »· · - ··.-...-. ,

- It is also known that the WäriEG ^ is applied MPACT a Störiichtbogens as a criterion for the detection thereof "This is done z, B _e in that - filaments are stretched from organic or inorganic substances in the cells, the burn through. Triggering criterion for the feeding breaker

, (Körner, M © - Konib _e KXein-Umspahnstation "UPS β) ·

The disadvantage of this detection rode is the relatively large variation in the time of detection of the arc fault, so that in general detection gundon can not be achieved below 100 ms. "

Another disadvantage is the fact that a check of the functionality of Störliohtbogenschutzes is possible only with tension-free switching cells. '

· "A" eiteros known method is that accommodate within the encapsulation as an indicator photodiodes or resistors _s are allowing the occurrence of an arc fault with optical-electronic © ^'1 If and development, the detection of arc fault' $ power cables of this arrangement are is that a · 'examination of the indicators are working properly and their Austiochselung only ira de-energized state of the switch cell is possible ₆ there is also di © danger that vulnerable voltages via extended Meldeleitmigen. transferred to ground _"o -

For the purpose of the invention, in particular, in the case of unipolar insulated installations with compressed gas as insulating medium, the detection is possible by means of isolated installation of the installation and measurement of ground fault currents occurring

This method has the disadvantage that a localization of the place of origin of the arc within an isolated unit after Auserbetriebnahü and opening of the enclosure is possible «This leads in particular in pressure-gas-insulated plants rait voltages of 11 ο kV and about to tentaufwendigen measures ©

Detriment of all identified Forfeited is that retrofitting of Störliehtbogenschutzes into existing systems ^ so far do not have an arc fault, always have a prolonged shutdown of the entire plant or Samraelschienenblockes result ".- .... -

Object of the invention

The aim of the invention is to develop an arrangement which allows a localization of the arc fault in a time of small Io ks «.

Bf-857

Explanation of the essence of the invention.

The invention has for its object to develop an arrangement for Störliohtbogenerfassung M eiche following conditions is sufficient S-. · '

~ Detection of the fault arc within a time less than 1 ο ras.

- Localization of Störliclitbogens on a specialist odor a partition of a Sohaltfeldes

- testing and evaluation possibilities of the essential components of fault detection outside the live area and easy retrofitting even in installations already constructed or in installations which are not equipped with anti-slip protection systems.

Features dex- Ex'findtmg

Erfindungsgenjci.ß the arc detection in .Cekapsolten switchgear is achieved in that the arc radiation, preferably in Spektralboreich the heat radiation is used as a detection variable and odor a plurality of Lichtleitkabel a part of the light radiation el.nera outside of the monitored space attached optoelectronic transducer '- supplied », At the output of the optooloktronischon converter, ·» constructed according to known circuits »», wiz'd an electrical signal - current or voltage »-, depending on the presence o.itios Siörliehthogen © provided in the Annex _t and can be used as tripping criterion have been abgonoaimen for Störliohtbogeni-oohichtunginrichtungon »

Embodiment:. :. '

The invention is explained below using an exemplary embodiment »

In the accompanying Prinzipzeichmmg Fig «1 shows the arrangement for arc detection in an air- · · · isolated encapsulated MS-Schaltfeld, Fig« 2 in a bulkhead room of a gas-insulated HS-control panel "Occurs in a bulkhead room (k) an arc, so" the associated Lichterseheinung of the through the enclosure (3) guided light guide (i) and your optp-elektroniseben converter (2) fed, ita oto-elektronon converter (2), the conversion of the light pulse via a photodiode with downstream amplifier in an electrical impulse "For the selective determination of the arc, the electrical impulse of the opto-electronic converter is provided, irrespective of the immediate actuation of protective elements (z _e B» circuit breaker, short circuiter)

Place available to query "

The optoelectronic transducer is preferably constructed according to well-known circuits "encapsulated. Compared to the considerably higher radiation intensity of the arc, MS switching field detectors (Fig. 1) can be reached without difficulty «For pressure-gas-insulated cubicles, the introduction of a fiber optic cable (i) into the enclosure (3) via a pressure-tight screw connection a cast-in or glued-in tap in front of the benches ". -. . ' The use of multiple fiber optic fib? the same . The space to be protected allows the safe avoidance of dead spots. The same effect can be achieved by using only one optical cable by dome-shaped spreading of the individual fibers at the end of the field. lead cable or by intent of a converging lens, »·

Claims (1)

Inventory test 1 arrangement for the arc detection in encapsulated Sehaltanlagen characterized in that the Lieht * »arc radiation of a fault arc detected by a Lichtleitkabel and fed to a outside of the .spannungsführenden area mounted optoelectronic transducer (2) 2 »arrangement for arc detection in encapsulated switchgear according to point 1 ^ characterized in that. For indication, preferably the spectral range of the heat radiation is used * 3e arrangement for arc fault detection in encapsulated switchgear according to item 1 ^ characterized in that by adjusting the Ansprecherapfindlichkeit the. Opto-electronic T / andlers a selectivity to daylight is achieved h e Arrangement for Stöx \ Lichtbogenerf tion in encapsulated switchgear according to item 1, characterized in that in gas-insulated Schaltanlogen the introduction of the optical fiber cable in the enclosure on a druekfeste screw or a cast or glued fitting "made". 5 * 'arrangement- to Störlichtbogenerfassung in encapsulated switchgear according to FUNC 1 _{f t} characterized in that the Unterbrirtgvuig the opto-electronic transducer hler- at a generals adjusting © Z ¹ ₉ B ^ Fe' register is vorgonomnaen tabular '' · Hi he 2-u / 1 Let me drawing