XS2 Current Unbalance Protection Relay

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The relay XS2 of the easy PROFESSIONAL LINE is a negative sequence protection relay with universal application. It serves for negative sequence pro-tection of three-phase generators. With a large number of different tripping characteristics and adjustment possibilities, the tripping characteristic can be made suitable for almost every type of generator with regard to its special thermal time-constant.

Connection XS2
Connection XS2

Protection Settings

Parameter Setting Range
I2s> 3% … 60% × I n (cont.)
I2w> 3% … 50% × I n (cont.)
DEFT 0 … 30 s / 0 …300 s (⌨) (cont.)
INV 100 … 300 s / 100 …3000 s (⌨) (cont.)
Time delay tw for warning 0 … 25 s / 0 … 250 s (⌨) (cont.)

(⌨) Different setting ranges via DIP switches. ( Smart view covers the whole range.)

Auxiliary Voltage

Voltage supply via wide-range power supply unit:

Auxiliary voltage range

19 … 390 V DC or

36 … 275 V AC (f = 40 … 70 Hz)

Power consumption

approx. 4 W (terminals A1 and A2)

Benefits of the Professional Line

  • Fast DIN rail mounting    easy and fast mounting
  • Sealable plastic covers    safe (see if anybody has broken the seal)
  • Super easy settings via front buttons    fast without computer
  • LED and output relays fault indication    easy to find out what has happened
  • Compact form factor    fits in small spaces
  • IT security    no way to attack via Ethernet
  • Robust and reliable    well proven reliable quality
  • Wide Range Power Supply    don’t worry about available supply voltage
  • Integrated Self-Test Procedure (via button)    fast and easy checks: relays, LEDs
  • For all relays except XD1-G and except XRI...: optional interface adapter XRS1 (order code XRS1A or XRS1*);

    for all XRI... [except XD1-G]: optional adapter RS485 to USB (order code RSC2485USB1):

      easy doing high precision settings via Windows ® PC software »Smart view«


Protection of electrical (HV, MV) synchronous generators against:

  • Negative sequence protection, ANSI / IEEE C37.2: 46)

Inputs and Outputs
Current transformer inputs 3
Output relays 2
Protection ANSI
Negative sequence protection 46
Mounting Type
Housing suitable for DIN rail mounting

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