Siemens Siprotec 5 7SJ82 Overcurrent & Feeder Protection Relay

The Siprotec 5 7SJ82 Protection relay 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 SIPROTEC Compact 7SK80 features flexible protection functions.Up to 20 additional protection functions can be created by the user. Therefore protection of change for frequency or reverse power protection can be realized, for example. The relay provides circuit-breaker control, further switching devices and automation functions. The integrated programmable logic (CFC) allows the user to add own functions, e.g. for the automation of switchgear (interlocking). The user is also allowed to generate user-defined messages.

Highlights-Conformal coating available (NEW)-Pluggable current and voltage terminals-Binary input thresholds settable using DIGSI (3 stages)-Secondary current transformer values (1 A / 5 A) settable using DIGSI-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 (over Port A or Port B)-Number of binary binputs and inary outputs by connection from up to two SICAM I / O-Units extendable.

Protection functions

• Overcurrent protection (50, 50N, 51, 51N)
• Directional overcurrent protection, ground (67N)
• Sensitive dir./non-dir. ground-fault detection (64Ns, 67Ns767N)
• Motor protection
  • Undercurrent monitoring (37)
  • Starting time supervision (48)
  • Restart inhibit (66/86)
  • Locked rotor (14)
  • Load jam protection (51M)
• Thermal Overload Protection (49)
• Under-/overvoltage protection (27/59)
• Frequency Protection (81O/U)
• Breaker failure protection (50BF)
• Unbalance-load protection (46)
• Lockout (86)

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. intel.)

Monitoring functions

• Operational measured values,
• Energy metering valuesWp,Wq
• Circuit-breaker wear monitoring
• Minimum and maximum values
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor statistics

Communication interfaces

• System/service interface
  • IEC 61850 Edition 1 and 2
  • IEC 60870-5-103
  • PROFIBUS-DP
  • DNP 3.0
  • MODBUS RTU
• Ethernet interface for DIGSI 4
• USB front interface for DIGSI 4

Hardware

• 4 current transformers
• 0/3 voltage transformers
• 3/7 binary inputs (thresholds configurable using software)
• 5/8 binary outputs (2 changeover/Form C contacts)
• 0/5 RTD inputs
• 1 life contact
• Pluggable current and voltage terminals
• Conformal coating available (NEW)

SIPROTEC 5 is part of the new generation of incomparable modular, flexible, and intelligent digital field devices. With modularly designed hardware and software and its high-performance DIGSI 5 engineering tool, the SIPROTEC 5 product family of field devices are perfect for protection, control, monitoring, and measuring applications in electrical energy systems. SIPROTEC 5 offers a wide product range with modular elements for every application and requirement.