XI1-I Overcurrent and Short-Circuit Protection Relay (XI1I1)
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Configuration
As an universal time overcurrent protection, the XI1I relay of the PROFESSIONAL LINE
is generally used in radial and meshed systems. Among other, it is applied as:
- selective overload and short-circuit protection relay for electr. machines, lines and networks, or for
- load dependent connection and disconnection of consumers and electric power generators.
It is possible to select from the following tripping characteristics:
Definite time overcurrent protection (DMT)
Inverse time overcurrent protection (IDMT) with selectable tripping characteristics
Normal Inverse
Very Inverse
Extremely Inverse
Furthermore, the XI1I can be employed as a backup protection for differential and distance protection relays.
Definite-Time Overcurrent Protection
| Parameter | Setting Range |
|---|---|
| I> | 0.5 … 2 × I n (cont.) |
| I>> | 1 … 15 × I n (cont.) |
| tI> | 0 … 1 s / 0 …10 s / 0 …100 s (⌨) (cont.) |
| tI>> | 0 … 2.5 s (cont.) |
(⌨) Different setting ranges via DIP switches. ( Smart view covers the whole range.)
Inverse-Time Overcurrent Protection
Tripping characteristics according to IEC 255‑4 or BS 142
| Parameter | Setting Range |
|---|---|
| I> | 0.5 … 2 × I n (cont.) |
| I>> | 1 … 15 × I n (cont.) |
| tI> | 0.1 … 2 s (cont.) |
| tI>> | 0 … 2.5 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 (distributed energy resources) to the public grid.
Protection of High, Medium and Low Voltage feeders against thermal damages by overload or short circuit currents.