Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH
EARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).
This is intended for protection application in medium voltage networks. These networks may
have isolated or resistance impedance earthed or solidly earthed neutral points. Definite
time over current relays are both suited for isolated systems and for use as back up to
differential relays and distance relays. Inverse time relays (over current relays with various
inverse times - current characteristics) are advantageous for interconnected systems and
solidly grounded systems. Another tool for reducing the tripping time for faults near the
source is to use the added instantaneous ( high set ) feature in the numeric relay .if the fault
occurs during the setting of relay ,the relay shall operate / trip for the previously selected /
default settings.

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Another
model is established for special applications with baud rate115kbps.Relay records 99 faults
with date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays are
configurable Configurable options for enabling & disabling of high-set in both Phase &
earth.

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY
(EFR) receives the input current signals (phase current and neutral current) via four input
current transformers. These signals are galvanically de-coupled, suitably filtered and fed to
the micro-controller, for amplitude calculation and further logical processing.

The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY
(EFR) of KP Series PNA TYPE is extensively used for selective short circuit and earth fault
protection of radial feeders in solidly earthed, resistance earthed or impedance earthed
power systems. It has wide applications in substations & industrial networks.

The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY
(EFR) of PNA TYPE can also be used in most application where inverse time, definite time
and instantaneous relays are required. The relay gives selective phase and earth fault
protection in time graded systems for transformers, motor etc. If ensures reliable protective
system and clears only the faulted section.

The micro-controller continuously monitors the magnitude of the phase current and
the neutral current .whenever the phase current or the earth current magnitude exceeds the
present value corresponding line / earth element will pick up and relay will trip after time
interval calculated by the selected IDMT curves. Whenever the fault level exceeds the
selected high set range, the relay will trip for high set, ignoring the selected IDMT curves. The
timer logic is processed and after comparison with set time schedules, tripping signals are
issued accordingly. There are two output relays , each output relay has two change over
contacts either for alarm or tripping. The output relays are programmable.
The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which can
be used with modbus protocol for communication purposes.

Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH
EARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).
This is intended for protection application in medium voltage networks. These networks may
have isolated or resistance impedance earthed or solidly earthed neutral points. Definite
time over current relays are both suited for isolated systems and for use as back up to
differential relays and distance relays. Inverse time relays (over current relays with various
inverse times - current characteristics) are advantageous for interconnected systems and
solidly grounded systems. Another tool for reducing the tripping time for faults near the
source is to use the added instantaneous ( high set ) feature in the numeric relay .if the fault
occurs during the setting of relay ,the relay shall operate / trip for the previously selected /
default settings.

The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY
(EFR) of KP Series PNA TYPE is extensively used for selective short circuit and earth fault
protection of radial feeders in solidly earthed, resistance earthed or impedance earthed
power systems. It has wide applications in substations & industrial networks.
The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH EARTH FAULT RELAY
(EFR) of PNA TYPE can also be used in most application where inverse time, definite time
and instantaneous relays are required. The relay gives selective phase and earth fault
protection in time graded systems for transformers, motor etc. If ensures reliable protective
system and clears only the faulted section.

Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITH
EARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR).
This is intended for protection application in medium voltage networks. These networks may
have isolated or resistance impedance earthed or solidly earthed neutral points. Definite
time over current relays are both suited for isolated systems and for use as back up to
differential relays and distance relays. Inverse time relays (over current relays with various
inverse times - current characteristics) are advantageous for interconnected systems and
solidly grounded systems. Another tool for reducing the tripping time for faults near the
source is to use the added instantaneous ( high set ) feature in the numeric relay .if the fault
occurs during the setting of relay ,the relay shall operate / trip for the previously selected /
default settings.

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Another
model is established for special applications with baud rate115kbps.Relay records 99 faults
with date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays are
configurable Configurable options for enabling & disabling of high-set in both Phase &
earth.

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY
(EFR) receives the input current signals (phase current and neutral current) via four input
current transformers. These signals are galvanically de-coupled, suitably filtered and fed to
the micro-controller, for amplitude calculation and further logical processing.

The micro-controller continuously monitors the magnitude of the phase current and
the neutral current .whenever the phase current or the earth current magnitude exceeds the
present value corresponding line / earth element will pick up and relay will trip after time
interval calculated by the selected IDMT curves. Whenever the fault level exceeds the
selected high set range, the relay will trip for high set, ignoring the selected IDMT curves. The
timer logic is processed and after comparison with set time schedules, tripping signals are
issued accordingly. There are two output relays , each output relay has two change over
contacts either for alarm or tripping. The output relays are programmable.
The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which can
be used with modbus protocol for communication purposes.

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Another
model is established for special applications with baud rate115kbps.Relay records 99 faults
with date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays are
configurable Configurable options for enabling & disabling of high-set in both Phase &
earth.

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONAL
NUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY
(EFR) receives the input current signals (phase current and neutral current) via four input
current transformers. These signals are galvanically de-coupled, suitably filtered and fed to
the micro-controller, for amplitude calculation and further logical processing

The micro-controller continuously monitors the magnitude of the phase current and
the neutral current .whenever the phase current or the earth current magnitude exceeds the
present value corresponding line / earth element will pick up and relay will trip after time
interval calculated by the selected IDMT curves. Whenever the fault level exceeds the
selected high set range, the relay will trip for high set, ignoring the selected IDMT curves. The
timer logic is processed and after comparison with set time schedules, tripping signals are
issued accordingly. There are two output relays , each output relay has two change over
contacts either for alarm or tripping. The output relays are programmable.
The relay rating (In) is field selectable either 1A or 5A. The relay has RS 485 com port which can
be used with modbus protocol for communication purposes.

Features :

• Programmable 1A/5A rated CT input.
• Three phase over current and earth fault protection
• Draw out with self-CT shorting.
• Three phase instantaneous over current protection.
• Earth overcurrent instantaneous  
• Negative phase sequence protection
• Protection against broken conductor
• Trip circuit supervision
• Harmonic restraint
• Circuit breaker failure detection
• Programmable Auto enclosure
• Fault recording
• Event recording
• Programmable matrix for -DO (Digital Out Put) and DI (Digital Input)
• Relay latching /Non latching (pulsed) -option.
• Protection blocking
• Communication - local (USB) and Remote(RS-485)