XI1-S Earth Overcurrent Relay for Solidly or Resistance Grounded Grids (XI1S1)
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Configuration
The XI1S of the PROFFESIONAL LINE is an all-purpose protection against earth faults,
used for electrical machines, lines and networks with solidly or sesistance-grounded
neutral; it is mainly used in radial networks. Very often the XI1S can be found as
backup protection at the central earthing point of the system. It detects all earth
faults occuring in the system.
Relay variant XI1S-R with directional current sensing is a selective earth-fault protection and is normally used in ring systems, networks with parallel feeders and in complex meshed systems.
Connections XI1S in holmgreen circuit
Connections XI1SR in holmgreen circuit
Definite-Time Earth Current Protection
| Parameter | Setting Range |
|---|---|
| IE> | 0.25 … 1.75 × I n (cont.) |
| IE>> | 1 … 15 × I n (cont.) |
| tIE> | 0 … 1 s / 0 …10 s / 0 …100 s (⌨) (cont.) |
| tIE>> | 0 … 1.25 s (cont.) |
(⌨) Different setting ranges via DIP switches. ( Smart view covers the whole range.)
Inverse-Time Earth Current Protection
Selectable tripping characteristics:
Normal Inverse
Very Inverse
Extremely Inverse
| Parameter | Setting Range |
|---|---|
| IE> | 0.25 … 1.75 × I n (cont.) |
| IE>> | 1 … 15 × I n (cont.) |
| tIE> | 0.1 … 2 s (cont.) |
| tIE>> | 0 … 1.25 s (cont.) |
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) |
- 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«
Interconnection of renewable energies (DER: distributed energy resources) to the public grid.
Earth fault protection of High, Medium and Low Voltage feeders.