Abstract                       

    • 6 voltage ranges provide a total setting range of 5 V to 480 V

• Excellent resetting ratios:

          97 % for operation on overvoltage

          <::;103 % for operation on undervoltage

• High continuous-overload capacity
• The operate value for the overvoltage re­ lay changes maximum 3 % within the range 45-500 Hz

• Insensitive to stray magnetic fields

• Electromechanical output relay with 2 me­ dium- (trip-) duty transter contacts and hand-reset  target

 APPLICATION : 

The RXEG 2f 'is a general purpose instanta­ neous voltage relay which can be used in both overvoltage and undervoltage protection schemes. Depending on the additional relays and modules with which it is used, the RXEG 21 can be applied in many ways:

 RK 411 102-DF

Neutral-point voltage detection

For power systems which are not solidly ground­ ed

Automatic selection of neutral-point voltage

For the detection of neutral voltage from either of 2 three-phase sources and automatic transfer­ ence of this quantity to the as80ciated protective relay

Flashover protection

For transformers on low voltage systems which

• are not solidly The relay operates on the occurrence of a flashover from the high to low voltage side

Overvoltage protection

To detect excessive voltage rise on transmissic lines, usually 400 kV-800 kV systems. The relc would typically be time-delayed to prevent ur necessary tripping for voltage rises of short du ation. The relay can also be used for generat< overvoltage protection. The high reset value is 1 particular value in these applications

Undervoltage protection

For  motors,  single-phase  for  less  important  ir duction   motors   and  three-phase   positive  s1 quence  for  synchronous  or  important  inductic motors. For these  motors, a voltage  proportion to   the   positive   sequence   component   of   tr three-phase    voltage    would    be    supplied RXEG 21 by a RXTBEA 2 filter

The high ratio (13) of continuous voltage ratir to minimum setting means that the relay can t

used where sensitive undervoltage settings a desired.