Proton Power Control Pvt Ltd

Pimple Nilakh, Pune, Maharashtra

The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current, over-voltage, reverse power flow, over- and under- frequency. Microprocessor-based digital protection relays now emulate the original devices, as well as providing types of protection and supervision impractical with electromechanical relays. In many cases a single microprocessor relay provides functions that would take two or more electromechanical devices. By combining several functions in one case, numerical relays also save capital cost and maintenance cost over electromechanical relays. However, due to their very long life span, tens of thousands of these "silent sentinels" are still protecting transmission lines and electrical apparatus all over the world. An important transmission line or generator unit will have cubicles dedicated to protection, with many individual electromechanical devices, or one or two microprocessor relays.

An Earth Fault Relay is a safety device used in electrical installations with high earth impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected.

• Relay trip for Earth-Neutral voltage fault.
• Earth fault voltage range selectable from 1 to 300 Volt.
• Indication of earth fault by message on display.
• Over voltage & under voltage set points site selectable.
• On delay site selectable

• Micro controller based technology.
• Protection against under voltage, Over voltage.
• All set points settable by keys.
• Trip Delay is settable
• Reverse Phasing Protection can be bypass through settings.
• Indications Voltage relay, fault relay ON.
• Message display for Under/Over Voltage.
• No separate auxiliary supply required.

• Micro controller based technology.
• Voltage protection along with digital voltage readout.
• Wide range of supply variation.
• Unit will also works on any one phase is present.
• Protection against Under Voltage.
• Protection against Over Voltage.
• Single Phasing & Reverse Phasing protection. Control output
• All the set points settable by keys.
• Phase unbalance protection.
• Trip Delay for Under voltage & Unbalance is settable
• Reverse Phasing Protection can be able to bypass through settings.
• Indications for Low Voltage , High Voltage, SPP & Relay ON .
• Message Display for SPP, Reverse Phasing & Unbalance Faults.
• No separate auxiliary supply required.
• Hold feature:- Press INC key in Running condition to observe particular supply voltage
• 1) If the input supply is within the range of the fault limit limits then On Timer starts decrementing on display & after set on Time over Relay will de ON with RLY indication glowing
• 2)If OV , UV, OF, UF, SPP/ reverse phasing / Unbalance occurs in the supply then relay will be OFF after the trip delay of that particular fault & LED starts blinking3) If any phase to Voltage increases above OV set point belay will trip after trip delay (100)ms ) over .If that particular phase to phase voltage reduces below COV set point Relay will be on after the set rest delay is over4) If any Phase to Phase Voltage increases / reduces above / the UB set point compared to other two Phase to Phase voltages , Relay will trip after delay over If that particular phase to phase voltage reduces / increases below / above (UB set point -/+ 10-V ) relay will be ON after the set reset delay over If the frequency reduces below UF or increases above OF then the relay will trip . Hysteresis is 1H25)If any of the Phase fails , Relay will trip after trip delay (100ms) over If all phases are present , relay will be ON after the set reset delay is over6) If Phase sequence is changed to R-B-Y/Y-R-B/B-R-Y; Relay will trip after the trip delay (100 ms) over . if phase sequence is corrected to R-Y-B, relay will after the delay over UB /SPP/REVP, UV, UF, OF.

• Micro controller based technology.
• Protection against under voltage, Over voltage, Over Frequency and Under Frequency.
• All set points settable by keys.
• Trip Delay for voltage & Frequency is settable
• Reverse Phasing Protection can be bypass through settings.
• Indications Voltage relay, Freq relay ON.
• Message display for Under/Over Voltage & UnderOver Freq Faults.
• No separate auxiliary supply required.

Protection of 3 Phase devices against Over voltage, Under voltage, Single Phasing, Reverse Phasing & unbalance supply are one of the major issue in electrical systems. For safe running of 3-phase devices, special protections that keep a continuous watch on supply conditions are very essential. The major cause of maximum load burn-out is overloading which occurs due to unbalance supply, Single Phasing & Reverse Phasing conditions.

Protection of induction motors against single phasing or reverse phasing or unbalance supply is one of the major problems in electrical systems. For safe running of 3-phase motors, special protections that keep a continuous watch on supply conditions are very essentials. The major cause of maxium motors burn-out is overloading which occurs due to unbalance supply or single phasing. Phase failure occurs in case of fuse blown-off, loose connections or loss of phase from supply itself.

• Operating Modes:

The operating mode can be selected using TEST or NORMAL Mode front panel Switch:

• NORMAL Mode:

> In this mode the AVR is operational. If PT input voltage is less than PT set point voltage minus hysteresis, then HIGH LED glow & there is a pulse of LOWER RELAY as per user setting pulse time & delay between two pulses & it clears if PT input voltage is greater than or equal to PT set point
> If PT input voltage is greater than PT set point voltage plus hysteresis, then LOW LED glow & there is a pulse of RAISE RELAY as per user setting pulse time & delay between two pulses, & it clears if PT input voltage is less than or equal to PT set point .
> If PT input voltage is less than UV set point then UV relay on & UV LED glow & it clears if PT input voltage is greater than or equal to UV set point plus hysteresis.

• TEST Mode:

> In TEST mode there is one potentiometer at front side of unit, it is independent of PT supply.
As per Potentiometer value voltage , Test Low & Test High LED glows as per PT voltage set point.

• Settings:

> To enter settings mode press set key and then press increment key for enter the correct password.
> The password value can be set by using INC or DEC key & then press ENT key.
> Press set key to move to next parameter. To edit parameter press increment/decrement keys
> To save and exit SET mode press ENT key.
> If no key is pressed then controller automatically goes to initial Display normal mode.
> The factory set password is 11.