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LESSON 1.3

VOLTAGERELAYS

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OPERATING PRINCIPLES

Fig. 1.3-1 Construction of Voltage Relay

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The voltage relay has tap bloc to select the

voltage setting such as !"# $"# 1""# 1"%# an&

11" as a minimum pic-up voltage.

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OVERVOLTAGE RELAY (59) TYPE IAV

'a( )C Circuit 'b( *C Circuit

Fig. 1.3-3 Connection *iagram of +ver Voltage Relay

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Fig. 1.3-, enerator Protection against arth Fault

For generator# it is a stan&ar& practice to provi&e overvoltage protection.

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Powerpoint Templates Page 9Fig. 1.3-% Connection of +ver Voltage with /ocout Relay

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The capacitor 59/C is used as haro!ic "#ter$or the #ea%a&e curre!t '(ero se)ue!ce

curre!t* i!side the de#ta co!!ectio! o$ the+o#ta&e tra!s$orer seco!dar,.

-t co!+erts #ea%a&e curre!t to +o#ta&e app#iedto the re#a,.

The #oc%out re#a, is a! e#ectrica##,

operated a!d ha!d or e#ectrica##, resetau0i#iar, re#a,.

-t is operated upo! the occurre!ce o$

a!ora# co!ditio!s to ai!tai! associatede ui e!t or de+ices out o$ ser+ice u!ti# it is

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For the circuit shown in Fig. 1.3-0# the relay voltage tap setting is $"V# the relay

rating is 11%V# an& time &ial is set to 0. f the voltage reaches 13%V# what is the trip

time of the relay2

Fig. 1.3-0

Percentage of tap voltage 13%4$" 5 1"" 1%"6

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