"IBL" make Relay Test Set, RNT33 & ZNT33 are suitable for testing distance relays. However, other relays
like overcurrent, over voltage, undervoltage, earthfault etc. can also be tested by this relay test set.

ZNT33

Input Voltage: 415V+10%, 3 phase, 4 wire, 50Hz. AC.

Output(s):
[a] Current output(s) [3 phase] available by smooth variation of variable autotransformer.
Range: 0 to 1,5,10,25 & 50A having 0 to 100% regulation in each tap selectable one at a time.
Rated maximum burden: 250VA.
Protection against overload, short circuit provided.
Multi-ratio wound primary measuring CT.

[b] Voltage Output(s):
RNT33:
110V, 3 phase 50Hz. AC having 6 different taps at 10%, 70%, 80%, 90%, 100% & 110%.
Rated maximum burden: 250VA.
Only B phase is continuously variable at any of the selected tap voltage.
DC voltage source: Isolated 0-110V/220V continuously variable DC of 100VA, without metering will be
available for 30 mins.

ZNT33:
110V AC, phase to phase, 63.5V phase to neutral, 3 phase 50Hz. AC continuously variable from 0 to
110%. Rated maximum burden: 250VA.
DC voltage source: Isolated 30V/110V/220V continuously variable DC of 100 VA, without metering will
be available for 30 mins.

[c] Phase Shifter
Phase Shifting can be done at any value between 0 to 3600 by coarse & fine control. Capacity: 250VA.

[d] Time Interval Meter Measuring Range: 9.999secs. & 99.99secs.

Special feature:
ZNT33: Added facility over RNT33 is in selection of fault vector in 1 phase to earth fault or phase to
phase fault. In ZNT33, the voltage of the healthy phase will remain unaltered.

Current, Voltage, Phase angle variation, Timer measurement will be indicated by respective digital meters.