Siemens SIPROTEC 7SA87 series：ideal for protecting high-voltage transmission lines
Product Overview
Item
Description
Product Type
Distance protection relay
Main Application
High-voltage electrical lines
Core Function
Quickly detects short circuits or ground faults and isolates the issue to prevent equipment damage
Positioning
A smart safety watchman for your power system
Key Features
Feature
Description
Fast Protection
Trips a faulty line in as little as 9 milliseconds to minimize equipment damage
Flexible Tripping
Supports both 1-pole and 3-pole tripping – disconnects only the faulty phase or all three phases as needed
Easy to Use
Access all information through a standard web browser – no complicated software required
Cybersecurity Compliance
Meets mainstream cybersecurity standards to protect against digital risks
Harsh Environment Adaptability
Features a conformal coating that protects against moisture, dust, and extreme temperatures
Application Scenarios
Application Area
Typical Use Cases
Power Utilities
Protection of high-voltage transmission lines
Industrial Plants
Protection of in-plant power supply lines
Renewable Energy Projects
Transmission line protection for wind farms, solar parks, etc.
Recommended Alternatives (SIPROTEC Family)
Model
Key Features
SIPROTEC 7SA86
Distance protection with similar features but different hardware configuration
SIPROTEC 7SD87
Line differential protection – ideal for short or medium-length lines
SIPROTEC 7SL87
Overhead line or cable protection with advanced fault location
SIPROTEC 7VK87
Bay control and protection for medium-voltage switchgear
SIPROTEC 7UM87
Generator and motor protection for power plants or large drives
This device is a fast-acting distance protection relay for high-voltage transmission lines, capable of tripping faulty lines in as little as 9 milliseconds while supporting both single-pole and three-pole tripping. It features easy browser-based access, cybersecurity compliance, and conformal coating for harsh environments. Typical applications include power utilities, industrial plants, and renewable energy projects, with alternative models available across the SIPROTEC family for different protection needs such as line differential protection, cable protection, bay control, and generator protection.
