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Test Data

ReliServ Solution

The SIPROTEC Compact 7SK81 provides 4 low-power current transformer inputs and optionally 3 low-power voltage transformer inputs. With the same low-power current transformer (LPCT) a wide range of primary rated line currents can be covered. Objects with rated currents in the rangefrom 20 A to 2500 A can be protected when using low-power current transformers.
The following low-power current transformer ratios are suitable for the following primary current operating ranges:
  • 300 A/225 mV for a primary operating current range of 60 A to 630 A
  • 600 A/225 mV for a primary operating current range of 120 A to 1250 A
  • 1250 A/225 mV for a primary operating current range of 250 A to 2500 A
  • 100 A/225 mV for a primary operating current range of 20 A to 200 A
The SIPROTEC 7SK81 is a multi-functional motor protection relay. It is designed for protection of asynchronous motors of all sizes. The relays have all the required functions to be applied as a backup relay to a transformer differential relay. The relay provides numerous functions to respond flexibly to the system requirements and to deploy the invested capital economically. Examples for this are: exchangeable interfaces, flexible protection functions and the integrated automation level (CFC). Freely assignable LEDs and a six-line display ensure a unique and clear display of the process states. In combination with up to 9 function keys, the operating personnel can react quickly and safely in any situation. This guarantees a high operational reliability.
  • Inputs for Low power CTs and VTs according to IEC 61869-6 (formerly IEC 60044-7 and IEC 60044-8)
  • Removable terminal blocks
  • Binary input thresholds settable using DIGSI (3 stages)
  • 9 programmable function keys
  • 6-line display
  • 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
Control functions/programmable logic
  • Commands for the ctrl. 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)
Monitoring functions
  • Operational measured values V, I, f
  • Energy metering valuesWp,Wq
  • Circuit-breaker wear monitoring
  • Minimum and maximum values
  • Trip circuit supervision
  • Fast measuring voltage failure “fuse-failure-monitor”
  • 8 oscillographic fault records
Communication interfaces
  • System/service interface
    • IEC 61850 Edition 1 and 2
    • IEC 60870-5-103 and IEC 60870-5-104
    • DNP 3.0
    • DNP3 TCP
    • Ethernet redundancy protocols RSTP,PRP and HSR
  • Ethernet interface for DIGSI 4 and extension up to two SICAM I/O-Units 7XV5673
  • USB front interface for DIGSI 4
  • 4 current transformers
  • 0/3 voltage transformers
  • 3/7 binary inputs (thresholds configurable using software)
  • 5/8 binary outputs (2 changeover/Form C contacts)
  • 1 life contact
  • Pluggable current and voltage terminals

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