Voltage & Frequency Protection Relay
The SIPROTEC Compact 7RW80 is a numerical, multifunction relay for connection to voltage transformers. It can be used in distribution systems, on transformers and for electrical machines. If the SIPROTEC Compact 7RW80 detects any deviation from the permitted voltage, frequency or over excitation values, it will respond according to the values set. The relay can also be applied for the purposes of system decoupling and for load shedding if ever there is a risk of a system collapse as a result of inadmissibly large frequency drops.
An integrated load restoration function allows the re-establishment of the power system after recovery of the system frequency. The 7RW80 features “flexible protection functions”. 20 additional protection functions can be created by the user. For example, a rate-of-frequency change or a rate of- voltage change function can be created. The relay provides circuit-breaker control, additional primary switching devices (grounding switches, transfer switches and isolating switches) can also be controlled from the relay.
Automation or PLC logic functionality is also implemented in the relay. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (including: interlocking, transfer and load shedding schemes). The user is also allowed to generate user-defined messages.
The communication module is independent from the protection. It can easily be exchanged or upgraded to future communication protocols.
Conformal coating available (NEW)
Pluggable current and voltage terminals
Binary input thresholds settable using DIGSI (3 stages)
9 programmable function keys
Buffer battery exchangeable from the front
USB front port
2 additional communication ports
Integrated switch for low-cost and redundant optical Ethernet rings
Ethernet redundancy protocols RSTP, PRP and HSR for highest availability
Relay-to-relay communication through Ethernet with IEC 61850 GOOSE
Millisecond-accurate time synchronization through Ethernet with SNTP
Under-/overvoltage protection (27/59)
frequency protection (81U/O)
Overexcitation protection (24)
Jump of voltage vector
Commands for the control of CB, disconnect switches (isolators/isolating switches)
Control through keyboard, binary inputs, DIGSI 4 or SCADA system
User-defined PLC logic with CFC (e.g. interlocking)
Operational measured values V, f
Minimum and maximum values
Trip circuit supervision
Fuse failure monitor
8 oscillographic fault records
– IEC 61850
– IEC 60870-5-103
– DNP 3.0
– MODBUS RTU
– Ethernet redundancy protocols RSTP, PRP and HSR
Ethernet interface for DIGSI 4
USB front interface for DIGSI 4
3 voltage transformers
3/7 binary inputs (thresholds configurable using software)
5/8 binary outputs (2 changeover)
1 life contact
The SIPROTEC 7RW80 unit is a numerical protection device
that can perform control and monitoring functions and
therefore provide the user with a cost-effective platform for
power system management, that ensures reliable supply of
electrical power to the customers. The ergonomic design
makes control easy from the relay front panel. A large, easyto-
read display was a key design factor.
The integrated control function permits control of disconnect
devices, grounding switches or circuit-breakers through
the integrated operator panel, binary inputs, DIGSI 4 or the
control or automation system (e.g. SICAM)
The integrated logic characteristics (CFC) allow the user to
add own functions for automation of switchgear (e.g. interlocking)
or switching sequence. The user can also generate
user-defined messages. This functionality can form the base
to create extremely flexible transfer schemes.
Operational measured value
Extensive measured values (e.g. I, V), metered values
(e.g.Wp,Wq) and limit values (e.g. for voltage, frequency)
provide improved system management.
Event logs, trip logs, fault records and statistics documents are
stored in the relay to provide the user or operator with all the
key data required to operate modern substations.
For the enhancement of the feeder protection the 7RW80
provides several stages for voltage and frequency protection.
Generator and transformer protection
Through implemented voltage, frequency and overexcitation
protection the SIPROTEC 7RW80 can be used for generators
and transformers in case of defective voltage or frequency
control, full load rejection or operation in islanding generation
System decoupling and load shedding
For system decoupling and load shedding the SIPROTEC
7RW80 provides voltage, frequency, rate-of-frequencychange
and rate-of-voltage-change protection.
For power system recovery, frequency protection and load
restoration are available in SIPROTEC 7RW80.
Switchgear cubicles for high/medium voltage
All units are designed specifically to meet the requirements
of high /medium-voltage applications. In general, no separate
measuring instruments (e.g., for current, voltage, frequency,
…) or additional control components are necessary.
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