VPR-A Voltage Protection0 pages
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VPR-A
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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
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