Prok dv's Digital Microcontroller Based Numerical IDMT/Definite Time/Instantaneous (low
set/High set) Over Voltage (OV) Under Voltage (UV) Relay with Negative Sequence
Protection offer reliable and flexible solutions for the protection of plants and feeders. It
incorporates IDMT characteristics, definite time characteristics and High speed features
for Over Voltage (OV) and Under Voltage (UV) settings. User friendly selection features-for
over Voltage (OV) and Under Voltage (UV) settings. An Alphanumeric 2 line 16-characters,
LCD display with membrane key pads for entering and changing parameters by user.
Over Voltage (OV), Under Voltage (UV) relay trip indications are provided using LEDs. The
Aux. Supply is provided by switched mode power supply with input voltage either AC or
DC with wide range from 85V-275 AC/DC. In case of AC the power supply is designed to
operate from 45Hz to 65Hz.

PNVNSP range of relays provide reliable and high
performance protection.
The PNVNSP is a relay for AC Voltage supervision with
universal application, it protects the three phase network
against over, under voltage, unbalance or earth faults in
isolated networks. Beside the pure RMS value measurement
of the line voltage the PNVNSP evaluates the symmetrical
components (U1, U2 & U0 sequence system). By evaluating
these components relay PNVNSP can detect the phase
sequence, voltage unbalance and earth faults.