VPR-A Voltage Protection0 pages

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VPR-A

Voltage - Frequency

Monitoring & Protection

Voltage and Frequency Protection

for Feeders and AC Machines

DESCRIPTION

The voltage protection relay VPR-A has been designed to measure the line or phase RMS voltage, frequency and

unbalance under normal condition or under disturbances. This information is internally processed by the

microprocessor, to take the voltage protection actions defined under ANSI or IEC standards. The different

functions provided by the VPR-A may be classified into the following groups:

APPLICATIONS

DIGITAL MEASUREMENT

Protection of generators, motors and transformer

against adverse system voltage conditions.

Ground fault detection 59N.

Supervision of automatic transfer switching

schemes.

RMS line and phase voltages.

Homopolar voltage.

Voltage unbalance.

Average voltage.

System frequency.

Phase sequence.

PROTECTION AND FUNCTIONALITY

• (27t/27i) Timed and instantaneous undervoltage.

• (27r) Residual undervoltage.

• (46) Voltage unbalance.

• (47) Phase reversal

• (59t/59i) Timed and instantaneous overvoltage.

• (59N) Homopolar voltage.

• (81) Underfrequency and Overfrequency.

• Five output relay programmable.

• Control power drop or internal fault relay.

SIGNALLING AND PROGRAMMING

• LED and LCD display indication.

• Touchpad programming.

• Indication and storage of fault condition and their

values.

• Undervoltage, overvoltage, unbalance, frequency

pickup indications.

• System status.

• Output relays status.

APPLICABILITY

Systems: Mono phase and 3 or 4-wire

three phase systems

Frequency 50 and 60 Hz

Voltage: 69 kV maximum

COMMUNICATION

• Remote communication using a PC or PLC by 1

RS232 or 2 RS485.

• Remote programming of the setpoints.

• Remote breaker opening or closing.

Protection relay

CQB Quality certified ISO 9001:2000 VPR-A_GBBR_050805