1 PROTECTION GRID PROTECTION Customer Benefits • Ideal for Neutral voltage displacement – detection of E/F irrespective of earthing system. • Tuned to fundamental frequency • Operation annunciation in the form of flag • Environmental friendly Electing phoratic painting process • Draw out type case • Complete dust proof by IP5X class protection Voltage Neutral Displacement Relay VDG 14
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1
PROTECTION
GRID
PROTECTION
Customer Benefits
• Ideal for Neutral voltagedisplacement–detectionofE/Firrespectiveofearthingsystem.
Aheavilydamped inductiondisc relaywithanadjustable in-verse time/voltage characteristic. The coil circuit of the relayistunedtothesupplyfrequencybyaseriesconnectedchokeandcapacitor.Thesecomponentsareenergizedfromatappedauto-transformerwhichprovidesadjustmentoftherelayvolt-agesetting.Atvoltagesabovethesetting,thechokesaturatesanddetunesthecircuitgivingtherelayahighcontinousvolt-agerating.Dampingofthediscmovementisbyaremovablehighretentivitypermanentmagnet.
Theuniquemethodofwindingtheoperatingcoilensuresthatthe time/voltage characteristics are identical on each of thevoltage taps. Selection of the required voltage setting is bymeans of a plug setting bridgewhich has a single insulatedplug. Tunedwound shading coils are fitted so that the relaydevelopsmaximumtorqueatthesupplyfrequencyandismuchlesssensitivetovoltageatthirdharmonicfrequencies.