Prok Devices Private Limited Rajajinagar, Bangalore, Karnataka

Prok dv’s make TAP POSITION INDICATOR (TPI) uses state-of-the-art dedicated hardwareto indicate the transformer tap position through two digit Seven segment LED displays, whileconnected to a remote transformer work, Tap position from 1 to 99 steps will be indicated bythe unit, increment of the readings will be in steps of one (each step represents 1 k- ohm),A potentiometer has been provided in front fascia of the unit, which can be used tocompensate the connecting lead resistance at site, ON/OFF switch provided in the front fasciawhich indicates the power on status of the unit.Note: If Terminal point 17- Variable point of tap position is open shows decimal point in theSeven segment displayPotentiometer shall be set to marking in the front faciaTAP Specification Transformer TAP- Steps Indication by means of 2 digit,Seven Segment Display. ON/OFF Switch in the Front facia with lamp indication to display the power input status Leads compensation through Potentio meter fine adjustment in the front facia Flush mounting Robust and rugged design, suitable for industrial environment

  The design is based on the fly back topology. High switching frequency makes thecomponents sizes to decrease, and hence reduction in the size. The efficiency of the unitis greater than 80%. The input voltage is applied to the transformer primary which isswitched at high frequency controlled by the feedback. The feedback is incorporatedusing Opto - isolators. The output of the transformer is rectified using proper rectifier diodes.The output is further smoothened with the use of smoothing inductors to reduce the rippleto the desired level. Specification Wide input voltage tolerance High efficiency Overload, short circuit & reverse polarity protection Very low load & line regulation Output power up to 480W Rugged, reliable and tropicalised design Work with natural convection cooling(No forced air cooling required) The operating temp. is -5° C to +55 ° C Input and output terminations and LED indications

Prok Dvs Make STATIC OVER VOLTAGE (OV) AND UNDER VOLTAGE (UV) RELAY WITH PHASEFAILURE (SINGLE PHASING) AND PHASE REVERSAL RELAY available in five models i.e. VD-02,VD-03, VD-04, VD-05 and VD-06 for various applications. They are provided with fixed orvariable voltage settings, auto reset, definite time delay fixed or variable settings. Specification Solid state circuitry Negative Phase sequence voltage detection Definite fixed or variable time delay Low power consumption Auto reset Fail safe system LED indication for healthy and fault indication DIN rail mounting

Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic. Specification Frame Leakage protection for L.T. Control Panels and switch boards. Earth Leakage protection for Feeders / Motors / Generators / Transformers / Mobile Operating Equipments. Protection for hazardous sensitive environments like Oil Refineries/ Cement Plant/Steel Plant /Chemical Platforms/Pulp industries and General Electrical Distribution. Protection for Mining & Control Engineering

STATIC PHASE FAILURE (PFR) RELAY / SINGLE PHASING PREVENTOR (SPP) from Prok dv's works onthe principle of negative phase sequence voltage detection of the incoming supply.Monitoring of the unbalance in the supply voltage is the proven technique which has beenadopted in the STATIC PHASE FAILURE (PFR) RELAY / SINGLE PHASING PREVENTOR (SPP). Specification Negative phase sequence detection Low power consumption Selectable percentage unbalance settings Auto/Manual reset operation Fail safe system Accurate, reliable and tropicalised Din Rail/surface mounting type

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) Specification Prok Devices Pvt ltd Make Numerical overcurrent and earth fault relay offers a compact multifunctional protection relay for   Feeder, Motor and Transformers. It  is a non-directional relay with IDMT (Inverse Definite Minimum Time), Definite time(DMT) and Instantaneous Trip time characteristics in single unit. Relay has been designed for protecting, controlling and monitoring distribution networks and substations. They can be used as a part of protection scheme for feeder, transformers and generators.

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Anothermodel is established for special applications with baud rate115kbps.Relay records 99 faultswith date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays areconfigurable Configurable options for enabling & disabling of high-set in both Phase &earth. PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing. Specification Poly carbonate front cover with external reset switch High Drop-off/Pick-up ratio Consistent repeat accuracy Unique combination o f 50/51/50N/51N in a single gadget Non-Volatile memory for data retention and retrieval in the event of power failure Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC Low AC burden Definite time curve for both Phase & Earth along with optional user defined curve.

Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITHEARTH 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 mayhave isolated or resistance impedance earthed or solidly earthed neutral points. Definitetime over current relays are both suited for isolated systems and for use as back up todifferential relays and distance relays. Inverse time relays (over current relays with variousinverse times - current characteristics) are advantageous for interconnected systems andsolidly grounded systems. Another tool for reducing the tripping time for faults near thesource is to use the added instantaneous ( high set ) feature in the numeric relay .if the faultoccurs during the setting of relay ,the relay shall operate / trip for the previously selected /default settings. Specification Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics Three phase, high-set, non-directional Over current relay with instantaneous or definite time function Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics Password protection 2 line 16 characters industrial grade LCD with back-lit module for numerical display of setting values and measured values which is user friendly Enabling /Disabling o f High-Set LED indications for power , pick-up, phase fault trip or Earth Fault trip f or IDMT and Highset RS-485 communication port with modbus protocol Relay test facility with relay trip & without relay trip High Drop-off/Pick-up ratio Consistent repeat accuracy Poly carbonate front cover with external reset switch

PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing. Specification Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics Modular Integrated Draw Out System for field adaptability and tropicalised design (MIDOS) RS-485 communication port with modbus protocol Relay test facility with relay trip & without relay trip Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set Definite time curve for both Phase & Earth along with optional user defined curve. Low AC burden Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC Non-Volatile memory for data retention and retrieval in the event of power failure Consistent repeat accuracy High Drop-off/Pick-up ratio Poly carbonate front cover with external reset switch

Prok dv's make PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NONDIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCR) WITHEARTH 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 mayhave isolated or resistance impedance earthed or solidly earthed neutral points. Definitetime over current relays are both suited for isolated systems and for use as back up todifferential relays and distance relays. Inverse time relays (over current relays with variousinverse times - current characteristics) are advantageous for interconnected systems andsolidly grounded systems. Another tool for reducing the tripping time for faults near thesource is to use the added instantaneous ( high set ) feature in the numeric relay .if the faultoccurs during the setting of relay ,the relay shall operate / trip for the previously selected /default settings. Specification Three phase , low-set, non - directional Over current relay with inverse definite minimum time (IDMT) or definite time characteristics Three phase, high-set, non-directional Over current relay with instantaneous or definite time function Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics Modular Integrated Draw Out System for field adaptability and tropicalised design (MIDOS) Password protection LED indications for power , pick-up, phase fault trip or Earth Fault trip f or IDMT and Highset Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set

The micro-controller continuously monitors the magnitude of the phase current andthe neutral current .whenever the phase current or the earth current magnitude exceeds thepresent value corresponding line / earth element will pick up and relay will trip after timeinterval calculated by the selected IDMT curves. Whenever the fault level exceeds theselected high set range, the relay will trip for high set, ignoring the selected IDMT curves. Thetimer logic is processed and after comparison with set time schedules, tripping signals areissued accordingly. There are two output relays , each output relay has two change overcontacts 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 canbe used with modbus protocol for communication purposes. Specification Three phase, high-set, non-directional Over current relay with instantaneous or definite time function Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics Password protection RS-485 communication port with modbus protocol Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set Consistent repeat accuracy High Drop-off/Pick-up ratio Poly carbonate front cover with external reset switch

The micro-controller continuously monitors the magnitude of the phase current andthe neutral current .whenever the phase current or the earth current magnitude exceeds thepresent value corresponding line / earth element will pick up and relay will trip after timeinterval calculated by the selected IDMT curves. Whenever the fault level exceeds theselected high set range, the relay will trip for high set, ignoring the selected IDMT curves. Thetimer logic is processed and after comparison with set time schedules, tripping signals areissued accordingly. There are two output relays , each output relay has two change overcontacts 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 canbe used with modbus protocol for communication purposes. Specification Trips for default/previously selected curve if the fault occurs during settings of the relay Membrane key pad for easy operation, dust proof front panel Enabling /Disabling o f High-Set RS-485 communication port with modbus protocol Relay test facility with relay trip & without relay trip Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set Consistent repeat accuracy Poly carbonate front cover with external reset switch

The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONALNUMERICAL/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 faultprotection of radial feeders in solidly earthed, resistance earthed or impedance earthedpower systems. It has wide applications in substations & industrial networks. The IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET NON-DIRECTIONALNUMERICAL/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 timeand instantaneous relays are required. The relay gives selective phase and earth faultprotection in time graded systems for transformers, motor etc. If ensures reliable protectivesystem and clears only the faulted section. Specification Three phase, high-set, non-directional Over current relay with instantaneous or definite time function Low-set non -directional Earth fault Relay with inverse definite minimum time (IDMT) or definite time characteristics Password protection 2 line 16 characters industrial grade LCD with back-lit module for numerical display of setting values and measured values which is user friendly Trips for default/previously selected curve if the fault occurs during settings of the relay Membrane key pad for easy operation, dust proof front panel Enabling /Disabling o f High-Set LED indications for power , pick-up, phase fault trip or Earth Fault trip f or IDMT and Highset RS-485 communication port with modbus protocol Relay test facility with relay trip & without relay trip Separate heavy duly output contacts provided f or time delayed phase fault with high-set and time delayed Earth Fault with high-set

Relay has modbus protocol with RS 485 port with baud rate 9600bps. Anothermodel is established for special applications with baud rate115kbps.Relay records 99 faultswith date and time. Relay rating (In) is field selectable- either 1A/5A.The output relays areconfigurable Configurable options for enabling & disabling of high-set in both Phase &earth. PNA TYPE IDMT/DEFINITE TIME/INSTANTANEOUS LOW-SET/HIGH-SET DIRECTIONALNUMERICAL/MICROPROCESSOR BASED OVER CURRENT RELAY (OCT) WITH EARTH FAULT RELAY(EFR) receives the input current signals (phase current and neutral current) via four inputcurrent transformers. These signals are galvanically de-coupled, suitably filtered and fed tothe micro-controller, for amplitude calculation and further logical processing Specification Unique combination o f 50/51/50N/51N in a single gadget Consistent repeat accuracy Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC Low AC burden Definite time curve for both Phase & Earth along with optional user defined curve. Relay test facility with relay trip & without relay trip RS-485 communication port with modbus protocol Enabling /Disabling o f High-Set Membrane key pad for easy operation, dust proof front panel

PNVNSP range of relays provide reliable and highperformance protection.The PNVNSP is a relay for AC Voltage supervision withuniversal application, it protects the three phase networkagainst over, under voltage, unbalance or earth faults inisolated networks. Beside the pure RMS value measurementof the line voltage the PNVNSP evaluates the symmetricalcomponents (U1, U2 & U0 sequence system). By evaluatingthese components relay PNVNSP can detect the phasesequence, voltage unbalance and earth faults. Specification Numeric DSP technology based relay. Two Groups of configuration parameter. Off line Trip Test mode Suitable for 50Hz/60Hz Single Phase/Three Phase selection Front IP54 transparent dust cover

Prok dv's Digital Microcontroller Based Numerical IDMT/Definite Time/Instantaneous (lowset/High set) Over Voltage (OV) Under Voltage (UV) Relay with Negative SequenceProtection offer reliable and flexible solutions for the protection of plants and feeders. Itincorporates IDMT characteristics, definite time characteristics and High speed featuresfor Over Voltage (OV) and Under Voltage (UV) settings. User friendly selection features-forover 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. TheAux. Supply is provided by switched mode power supply with input voltage either AC orDC with wide range from 85V-275 AC/DC. In case of AC the power supply is designed tooperate from 45Hz to 65Hz. Specification IDMT & Definite time characteristics Negative phase sequence detection High Pickup/drop off ratio Modular Integrated draw out system Nonvolatile memory for data retention Wide range of system voltages High speed feature for under voltages and over voltages

PDMPPRNEXM series offers a multi functional comprehensive smart protection solution for Feeder, Generator, Motor & Transformer segment.PDMPPRNEXM family of protective relays are advance numrical relays that provide multi protection and monitoring with reliable and fast protection solutions in single unit. Specification 1A & 5A Programmable rated cur communication 25 Fault records 50 Event records Motor start/stop record Programmable input/output

Prok Dvs an ISO 9001:2008 Company indigenously develops the power system protection relays and panel meters for power system. μP based Zero sequence voltage relays are the state of the art design, to monitor and protect the costly equipments against unbalance voltages.The Relay Continuously monitoring all the three phase Line to Line Voltages, if any abnormal condition persists in the system internal Relay activated with predetermined set value of definite time.The Unit Displays Line to Line Voltages on LCD display, Healthy and Fault /Trip status Information through LED Display. Specification Accurate and reliable measurement .of residual voltage. Display of voltage magnitudes, using 8 character 2 line LCD User friendly Setting Parameters through key pad switch Wide range for Selection of residual voltage User configurable Definite tripping time (DMT) Fast tripping response(

Monitoring & Supervision of Under and Over voltage in power generating plants &distribution system To protect Generators & AMF switch boards For protection of synchronous & induction motors For transformer feeder panel Protection for capacitor control panels Specification Site selectable system voltage Continuous display of the measured voltage parameter 16 character 2 line LCD display with back-lit Accurate reading for balanced and unbalanced load Wide range of auxiliary input for both AC & DC Independent contacts for both Under & Over voltage Self reset & site selectable reset gap Built in fixed instantaneous Under & Over voltage highest trip User friendly setting modes using key pads Tropicalized design using micro controller & Ideal for industrial environment

All the line voltages are monitored and sensed simultaneously using three independentscale down potential transducer this low level ac signal is subjected to signal condition,which includes surge suppressors and harmonic filter, filtered signal is fed to the ADC of theindustrial grade pic micro controller, When the sensing voltage level exceeds the user setvalue f or under or over voltage, Digital Microcontroller based definite-time under voltage(uv) and over voltage (ov) relay/line voltage monitor(LVM) gives an output signal in the formof relay change over for tripping/alarming. Specification Monitoring & Supervision of Under and Over voltage in power generating plants & distribution system To protect Generators & AMF switch boards For protection of synchronous & induction motors For transformer feeder panel Protection for capacitor control panels

Prok dvs make AC Digital Microcontroller Based Definite-Time Under Voltage (UV) and Over Voltage (OV)/ Line Voltage Monitor (LVM) is a microcontroller based voltage monitoring and supervision  relay  for poly-phase system. It can monitor both under voltage (UV) and over voltage (OV) conditions in the system. Both under voltage (UV) & over voltage (OV) conditions are associated with definite time tripping characteristics. It has wide setting range of operating time on the occurrence of fault condition. DIGITAL MICROCONTROLLER BASED DEFINITE TIME UNDER VOLTAGE (UV) AND OVER VOLTAGE RELAY/ LINE VOLTAGE MONITOR(LVM) provides wide range of time delay for healthy resumption of the operating voltage.  Specification Site selectable system voltage Continuous display of measured voltage parameter 16 character 2 line LCD display with back-lit Accurate reading for balanced and unbalanced load Wide range of auxiliary input for both AC & DC Independent contacts for both Under & Over voltage Self reset & site selectable reset gap Built in fixed instantaneous Under & Over voltage highest trip User friendly setting modes using key pads Low power consumption Tropicalized design using micro controller & Ideal for industrial environment

Prok dvs make AC DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDER VOLTAGE (UV)AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) is a microcontroller basedvoltage monitoring and supervision relay for polyphase system. It can monitor bothunder voltage (uv) and over voltage (ov) conditions in the system. Both under voltage(uv)& over voltage(ov) conditions are associated with definite time tripping characteristics. Ithas wide setting range f or OV&UV settings and also wide range of operating time on theoccurrence of fault condition. DIGITAL MICROCONTROLLER BASED DEFINITE-TIME UNDERVOLTAGE (UV) AND OVER VOLTAGE (OV) RELAY / LINE VOLTAGE MONITOR (LVM) provideswide range of time delay for healthy resumption of the operating voltage. Specification Site selectable system voltage Continuous display of the measured voltage parameter 16 character 2 line LCD display with back-lit Accurate reading for balanced and unbalanced load Wide range of auxiliary input for both AC & DC Independent contacts for both Under & Over voltage Self reset & site selectable reset gap Built in fixed instantaneous Under & Over voltage highest trip Tropicalized design using micro controller & Ideal for industrial environment

The application of powerful microprocessors DIGITAL MICROPROCESSOR BASEDRESTRICTED EARTH FAULT RELAY (REFR) opens a new chapter for power system protectiverelaying. The digital processing of measured values and the ability to perform complexarithmetic and logic operations, give digital protection relays significant performance andflexibility improvements over their traditional analogue counterparts. Additionaladvantages - very small power consumption, adaptability, self-supervision, smallerphysical construction and selectable relay characteristics - all combine to allow theimplementation of accurate and highly reliable protection schemes at a significantlyreduced financial burden. Specification Microprocessor Based Design Wide Setting Ranges Universal Auxiliary supply 85-275V AC/DC Rugged and Compact Design 8 Character Back-lit LCD Display of Fault current

Earth Leakage Current give rise to generation of heat and result in progressive failure ofinsulation, which leads to earth faults sparking flashovers, deterioration of earthing and finallyresults into catastrophic fires which destroys costly equipments, gadgets and precious lives.It is therefore essential to detect earth leakage current well before they cross the thresholdlimits and isolate the circuit in the event of leakages. Conventional over current and shortcircuit protection device are not designed detect earth leakage currents. Prok dv's make Static Earth Leakage Relay (ELR) with Core Balance Current Transformer ( CBCT/ ZCT) are used to detect the leakage current in an Electrical Power System. Static EarthLeakage Relay (ELR) Transmits a signal to activate the trip coil of the MCCB/ACB/OCBCONTACTOR in the event of Earth leakage, resulting in automatic isolation of the electricalpower system. Static earth leakage relay (ELR) and core balance current transformer (CBCT /ZCT) have been widely used and accepted because these have field adaptability and areeconomic. Specification Consistent reliability with accuracy. Fixed or variable current sensitivity by Dip Switch selection LED’s for visual indication of fault. High Barrier connector at rear for easy termination and safety standards. Tamper proof polycarbonate cover in the front. Test & Reset Facility for testing healthiness of the relay