SIEMENS SIPROTEC 4 SIPROTEC 7SJ62 MULTIFUNCTION OVER CURRENT PROTECTION RELAY

Product Description

Siemens Siprotec 4 Siprotec 7SJ62 Multifunction Over Current ProtectionRelay

The SIPROTEC 4 7SJ62 relays can be used for line protectionof high and medium voltage networks with earthed (grounded), low-resistanceearthed, isolated or compensated neutral point. With regard to motorprotection, the SIPROTEC 4 7SJ62 is suitable for asynchronous machines of allsizes. The relay performs all functions of backup protection supplementary totransformer differential protection. 7SJ62 is featuring the "flexible protectionfunctions". Up to 20 protection functions can be added according toindividual requirements. Thus, for example, a rate-of-frequency-changeprotection or reverse power protection can be implemented. The relay providescontrol of the circuit-breaker and automation functions. The integratedprogrammable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switchgear (interlocking). The user is also allowed togenerate user-defined messages. The flexible communication interfaces are openfor modern communication architectures with control systems.

PROTECTION FUNCTIONS

• Overcurrent protection (definite-time/inverse-time/user-def.)
• Directional overcurrent protection (definite-time/inverse-time/user-def.)
• Sensitive dir. earth-fault detection
• Displacement voltage
• Intermittent earth-fault protection
• Directional intermittent ground fault protection
• High-impedance restricted earth fault
• Inrush restraint
• Motor protection
• Overload protection
• Temperature monitoring
• Under-/overvoltage protection
• Under-/overfrequency protection
• Rate-of-frequency-change protection
• Power protection (e.g. reverse, factor)
• Undervoltage controlled reactive power protection
• Breaker failure protection
• Negative-sequence protection
• Phase-sequence monitoring
• Synchro-check
• Auto-reclosure
• Fault locator
• Lockout

CONTROLFUNCTIONS/PROGRAMMABLE LOGIC

• Commands for control of a circuit-breaker and of isolators
• Position of switching elements is shown on the graphic display
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• User-defined logic with CFC (e.g. interlocking)

MONITORING FUNCTIONS

• Operational measured values V,l,f
• Energy metering values Wp,Wq
• Circuit-breaker wear monitoring
• Slave pointer
• Trip circuit supervision
• Fuse failure monitor
• 8 oscillographic fault records
• Motor Statistics

COMMUNICATIONINTERFACES

• System interface
  IEC 60870-5-103/ IEC 61850
  PROFIBUS-FMS/-DP
  DNP 3.0/MODBUS RTU
• Service interface for DIGSI 4 (modem)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77

HARDWARE

• 4 current transformers
• 3/4 voltage transformers
• 8/11 binary inputs
• 8/6 output relays