XU2-AC AC VOLTAGE RELAY Woodward

Description

Overview

Essential details：XU2-AC AC VOLTAGE RELAY Woodward

The voltage relay, type XU2-AC, of the PROFESSIONAL LINE, is a digital measuring relay for the supervision of two, three and four wire systems. It protects electrical power generators, consumers or general equipment against inadmissible overvoltage or undervoltage and can be used for low voltage and for medium voltage systems.
In addition it is possible to supervise the phase sequence.
When compared to conventional protection equipment all relays of the PROFESSIONAL LINE reflect the superiority of digital protection techniques with the following features:
• High measuring accuracy by digital data processing
• Fault indication via LEDs
• Extremely wide operating ranges of the supply voltage by universal wide range power supply
• Very fine graded wide setting ranges
• Data exchange with process management system by serial interface adapter XRS1 which can be retrofitted
• RMS – measurement
• Extremely short response time
• Compact design by SMD-technology
In addition to this relay XU2-AC has the following special features:
• Different switching hysteresis adjustable
• The tripping periods for overvoltage/undervoltage supervision separately adjustable
• Phase sequence supervision switchable
• Measurement phase-to-neutral or phase-to-phase voltage possible

XU2-AC

Analog inputs
The analog input signals of AC voltages are connected to the protection device via terminals L1-L3 and N.
Auxiliary voltage supply
Unit XU2-AC can be supplied directly from the measuring quantity itself or by a secured auxiliary supply. Therefore a DC or AC voltage must be used.
Unit XU2-AC has integrated wide range power supply. Voltages in the range from 19 – 55 V DC can be applied at connection terminals A1(L-) and A2(L+). Terminals A1/A3 are to be used for voltages from 50 – 750 V DC or from 36 – 520 V AC.

Unit XU2-AC has an independent overvoltage (U>) and undervoltage supervision (U<) with separate adjustable pickup values and tripping periods. The noise signals caused by inductive and capacitive coupling are supressed by an analog RC-filter circuit.
The analog voltage signals are fed to the A/D-converter of the microprocessor and transformed to digital signals through sample-and-hold circuits. The analog signals are sampled with a sampling frequency of 16 x fn, a sampling rate of 1.25 ms for every measuring quantity (at 50 Hz).
The voltages are compared with the set reference values. For three-phase overvoltage supervision the highest voltage in each phase is evaluated, for undervoltage supervision the lowest in each phase.
Pickup of a supervision circuit U> or U< is indicated by flashing of the corresponding LED, after tripping it is steady lit.

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Superiority products XU2-AC AC VOLTAGE RELAY Woodward