SIPROTEC 7SA64 Distance Protection Relay

the siprotec 7sa64 distance protection relay is a universal relay for protection, control and automation with a graphic display on the basis of the siprotec 4 system. Its high level of flexibility makes it suitable to be implemented at all voltage levels. With this relay you are ideally equipped for the future: it offers security of investment and also saves on operating costs. High-speed tripping time-impedance setting range allows very small settings for the protection of very short lines-self-setting detection for power swing frequencies up to 7 hz-current transformer saturation detector prevents non-selective tripping by distance protection in the event of ct saturation.-phase-segregated teleprotection for improved selectivity and availability-digital relay-to-relay communication by means of an integrated serial protection data interface-adaptive auto-reclosure (adt)

protection functions

• non-switched distance protection with 6 measuring systems (21/21n)

• high resistance earth-fault protection for single and three-phase tripping (50n, 51n, 67n)

• earth-fault detection in isolated and resonant-earthed networks

• tele (pilot) protection (85)

• fault locator (fl)

• power-swing detection/tripping (68/68t)

• phase-overcurrent protection (50/51)

• switch-onto-fault protection (50hs)

• stub bus overcurrent protection (50stub)

• overvoltage/undervoltage protection (59/27)

• over/underfrequency protection (81o/u)

• auto-reclosure (79)

• synchro-check (25)

• breaker failure protection (50bf)

• thermal overload protection (49)

control functions

• commands for control of c.b. And isolators

monitoring functions

• trip circuit supervision (74tc)

• self-supervision of the relay

• measured-value supervision

• event logging

• fault logging

• oscillographic fault recording

• switching statistics

front design

• easy operation with numeric keys

• function keys

• leds for local alarm

• pc front port for convenient relay setting

communication interfaces

• front interface for connecting a pc

• system interface for connecting to a control system via various protocols
  - iec 60870-5-103 protocol
  - profibus-fms/-dp
  - dnp 3.0
  - iec 61850 ethernet

• 1 serial protection data interface for teleprotection

• rear-side service/modem interface

• time synchronization via - irig-b or dcf 77 or - system interface