Numerical Distance Protection Relay

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Protection Elements for Comprehensive Numerical Transmission Line Protection Relay;

Impedance Function :

• Single Phase Distance Protection
• Four Independent Groups
• Five Independent Zones of Protection
• Permissive Over reach Trip Transfer (Z1ext.)
• Independent Polygonal/Mho characteristics for Phase to Phase and Phase to Ground Faults
• Power swing Detection
• Load Encroachment Detection
• Settable Switch On to faults and Auto Recloser
• VT Fuse Fail
• Circuit Breaker failure(50BF)
• Disturbance Recorder
• 16 Red, Green LED for Indications
• Relay healthy indication (Green).

Relay Design Features :

• Minimum operating time of 1.5 Cycles (30msec).
• Large 20x4 LCD display for Parameter and setting display.
• In built Real Time Clock with non-volatile memory for time stamping.
• Display of various counters
• Disturbance Recorder - Up to 1sec of actual waveform of current & voltage along with logical and physical status are captured & saved in built-in memory with date time stamping, for analyzing fault condition & fault location.
• Online display of CB status and other digital and logical status.
• Continuous monitoring of module’s internal hardware and alarm generation in case of failure of any critical components.
• 10 Programmable Digital Output contacts.
• 8 Optically isolated digital status input for monitoring of status and avoid use of external relay logic.
• 2 dedicated status input for Trip Circuit Monitoring.
• 100 nos. of event memory, event such CB close, Trip, digital status change, relay pkp etc. All events are with date and time stamped with up to 1ms accuracy.
• 10 nos. of Fault data stored with keypad interface and time.
• Display of Voltage, current, frequency, Reactance, Resistance in terms of secondary value. Control Panel: Control Panel suitable for the testing of Numerical Distance protection relay,
• Mainly consist of Power Input 230V AC 50 Hz, Built in variable current source 0-20 Amp and Variable Voltage source: 0-250V AC, Time interval meter- stop/ start timer digital, Power ON/ OFF mains switch/ MCB, power ON indication, Control circuit for Current injection and voltage injection.
• Auxiliary power supply for relay 220 or 110 or 48 or 24 Volts AC or DC. Built in digital Ammeter and Voltmeter. With fault simulating switchs.