Siemens 7SJ80

The Siemens 7SJ80 Overcurrent Protection relay is a multi-functional motor protection relay. Siemens SIPROTEC 7SJ80 is designed for the 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. Siemens SIPROTEC Compact 7SJ80 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, Siemens Siprotec 7SJ80 relay provides circuit-breaker control, further switching devices, and automation functions. The integrated programmable logic (CFC) allows the user to add their 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-Number of binary inputs and binary outputs by a connection from up to two SICAM I / O-Units extendable.

SIPROTEC 7SJ80 series relays are the best retrofitting option to old 7SJ600 series relays as they have the same cut-out requirements.

Also using these relays as a replacement you can upgrade to a new generation substation as these relays can provide the latest communication protocol IEC 61850.

SIEMENS 7SJ80 RELAY PROTECTION FUNCTIONS

• overcurrent protection (50, 50N, 51, 51N)
• Directional time-overcurrent protection (67, 67N)
• Sensitive dir. ground-fault detection (67Ns)
• High-impedance restricted ground fault (87N)
• Undercurrent monitoring (37)
• Overload protection (49)
• Under-/overvoltage protection (27/59)
• frequency protection (81O/U)
• Breaker failure protection (50BF)
• negative-sequence protection (46)
• Synch-check (25)
• Auto-reclosure (79)
• Fault locator (21FL)
• Lockout (86)

SIEMENS 7SJ80 CONTROL FUNCTIONS/PROGRAMMABLE LOGIC

• Commands for the ctrl. of CB, disconnect switches (isolators/isolating switches)
• Control through a 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 values Wp, Wq
• Circuit-breaker wear monitoring
• Minimum and maximum values
• Trip circuit supervision (74TC)
• 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
  – PROFIBUS-DP
  – DNP 3.0
  – MODBUS RTU
  – DNP3 TCP
  – PROFINET
  – 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

Siemens 7SJ80 Overcurrent Protection 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)
• 1 life contact
• Pluggable current and voltage terminals
• Conformal coating available (NEW)

Perfectly suited for protection in distribution systems and industry, with minimal space requirement. SIPROTEC Compact devices provide a comprehensive range of functions in surprisingly compact and space-saving housing. Whether as main or as backup protection, a single SIPROTEC Compact device provides protection functionality for every conceivable fault. And it can do even more – it supports the control, automation, and monitoring functions in the substation.