SIPROTEC 5 7SA87 / 7SL87 — distance and differential protection relays for high-voltage lines
Modular SIPROTEC 7SA87 and 7SL87 relays on the SIPROTEC 5 platform protect overhead and cable lines of 35–750 kV. Minimum tripping time is 9 ms, and the 7SL87 handles up to six line ends. Configuration in DIGSI 5.
- 7SA87
- distance protection of overhead lines, 1- and 3-pole tripping, min. tripping time 9 ms, Fault Locator Plus, adaptive auto-reclosing (AREC)
- 7SL87
- differential and distance protection of overhead and cable lines, up to 6 line ends, 1-pole tripping
- 7SL87 hardware
- 12 standard versions; 4/4 or 8/8 CT/VT inputs; 5–31 binary inputs; 8–46 outputs
- Communication
- up to 4 exchangeable modules, PRP/HSR; protection channel over optical fiber, two-wire line or network
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
SIPROTEC 7SA87 and 7SL87 are modular protection relays for high- and extra-high-voltage transmission lines on the SIPROTEC 5 platform. They selectively and quickly clear short circuits and earth faults on overhead and cable lines in networks of any configuration and form the basis of protection and automation of transmission and distribution networks.
The 7SA87 relay provides distance protection of high-voltage lines with single- and three-pole tripping. Minimum tripping time is 9 ms. It features detection of current transformer saturation for fast and accurate operation, the Fault Locator Plus function for accurate fault location on non-homogeneous line sections, and targeted auto-reclosing of individual overhead line sections (AREC).
SIPROTEC 7SL87 combines phase-segregated differential and distance protection of overhead and cable lines. It works with single- and multi-ended infeed on lines of any length, with up to six line ends and single-pole tripping. The main function is differential protection with an adaptive algorithm, which keeps sensitivity and stability despite transformer errors, their saturation and capacitive line charging currents. Protection data are transmitted over optical fiber, two-wire communication lines and communication networks, with automatic switching between ring and chain topology. There are 12 standard versions, with 4/4 or 8/8 current/voltage inputs, 5–31 binary inputs and 8–46 outputs; the device is compatible with SIPROTEC 5 and SIPROTEC 4.
Both relays are configured in DIGSI 5, which combines protection, control, automation, monitoring and power quality functions, and logic is created in a graphical editor. Up to four exchangeable communication modules with PRP and HSR redundancy can be installed, and diagnostics are available through a web browser. The boards have a conformal protective coating for harsh conditions, and cybersecurity functions meet NERC CIP and BDEW Whitepaper requirements. The family also includes 7SA82/86, 7SD80/82/86/87 and 7SL82/86. Applications include overhead and cable lines of 35–750 kV.
Technical specifications
| 7SA87 | distance protection of overhead lines, 1- and 3-pole tripping, min. tripping time 9 ms, Fault Locator Plus, adaptive auto-reclosing (AREC) |
|---|---|
| 7SL87 | differential and distance protection of overhead and cable lines, up to 6 line ends, 1-pole tripping |
| 7SL87 hardware | 12 standard versions; 4/4 or 8/8 CT/VT inputs; 5–31 binary inputs; 8–46 outputs |
| Communication | up to 4 exchangeable modules, PRP/HSR; protection channel over optical fiber, two-wire line or network |
| Cybersecurity | NERC CIP, BDEW Whitepaper |
| Design | conformal coating of boards |
| Software | DIGSI 5, web access |
Request a price and lead time
SIPROTEC 5 7SA87 / 7SL87 — distance and differential protection relays for high-voltage lines. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
Which lines are the 7SA87 and 7SL87 intended for?
For overhead and cable lines of 35–750 kV. The 7SA87 provides distance protection, the 7SL87 combines differential and distance protection.
How many line ends does the 7SL87 serve?
Up to six ends, with single-pole tripping. Protection data are transmitted over optical fiber, a two-wire line or a communication network.
What hardware versions does the 7SL87 have?
There are 12 standard versions with 4/4 or 8/8 current/voltage inputs, 5–31 binary inputs and 8–46 outputs.
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