XE2 DC Current Relay for Loss of Excitation Protection

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Documentation (Brochures & Manuals)

  • XE2 – ANSI 64REF

The relay XE2 of the easy PROFESSIONAL LINE is used for supervision of the exciter current. By the exciter current element the direct current of the excitation machine in brushless machines is supervised. The protection function includes detection of overcurrent and undercurrent as well as supervision of the ripple component of the exciter current and so faults of the rotating diodes would be revealed.

Connection XE2

Protection Settings

Parameter Setting Range
I> 0 … 15 A (min. 0.2 A)
I< 0 … 5 A (min. 0.2 A)
IR> 0 … 125% (min. 10%)
tI> 0 … 5 s / 0 … 50 s (⌨) (cont.)
tI< 0 … 5 s / 0 … 50 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)

Features of the XE2

  • 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:

  • Protection against damages by short-circuit currents.

  • Underexcitation damages (field failure protection, ANSI / IEEE C37.2: 40)

Inputs and Outputs
Output relays 2
Protection ANSI
Time overcurrent protection 50/51
Field failure protection 40
Mounting Type
Housing suitable for DIN rail mounting

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