The dual powered, non-directional overcurrent and earth fault protection relay is primarily intended for the use in secondary distribution electrical networks.

Application

• Protection Relay for Ring Main Units (RMU)
• Back-Up protection for medium voltage applications
• Protection in remote locations without auxiliary supply
• Control and relay panel’s refurbishment of old electromechanical protection relays
• Protection of Renewables systems

Features

• Simple, numerical overcurrent and earth fault protection relay
• Definite-time and inverse-time overcurrent and earth fault protection functions in accordance to IEC and ANSI standards
• Relay powered by the current transformers, a connection to an auxiliary supply is not required
• High sensitivity: 80% of Is min current in single phase and 40% of Is min current in three phases
• Built-in of an capacitor discharge pulse output for low-energy trip coil of the circuit breaker and low power Remote Flag indicator.
• User programmable 2 LEDs for assigning protection functions and phase indications
• 10 Fault records
• Up to 100 Event records with 1 ms resolution
• Password protection
• Self-monitoring

Housing

Compact, Non draw-out case, flash mounting, Pluggable connectors except CT terminal, 3 current transformer, one impulse output, one remote flag output,

4 LEDs

x 2 binary inputs, 2 binary outputs

User interface

• 2 line by 16 character
• Menu navigation keys
• 2 non-programmable LEDs and 2 Programmable LEDs
• Front USB interface

Front fascia

X Standard version with Trip flag indicator

Communication

X Front port: USB and rear port: RS485 supporting IEC 60870-5-103 and

  Modbus RTU (user selectable setting)

Power Supply

• CT Power
• USB Power or
• Battery Power

Auxiliary voltage

X Dual powered (CT powered + aux. powered: 24 - 240 V DC / 60 – 240V AC)

Measuring Input

O Rated current 0.075A(secondary),50/60 Hz,

  Support six variants of 5P80 Type Primary CTs,

CT01 – 8 - 28A,

CT02 - 16- 56A,

CT03 – 32 – 112A,

CT04 – 64 - 224A,

CT05 – 128 - 448A,

CT06 - 256 - 896A

Functionality

The Dual powered protection device is equipped with the following protection functions:

X Basis protection function

• Instantaneous Overcurrent Protection (50)
• Instantaneous Derived Earth Fault (50N)
• Time Delayed Overcurrent (51)
• Time Delayed Derived Earth Fault (51N)
• Line Check / Switch-On-To-Fault (50LC/SOTF)
• Supervision functions:Inrush detection 81HBL2