Overview of the SIPROTEC 7SJ Series
At HONGKONG XIEYUAN TECH CO., LTD, we provide the SIPROTEC 7SJ series, designed by Siemens for reliable protection and control of feeders and lines in medium-voltage networks. These devices combine intelligent protection, control, and monitoring functions in one compact unit, giving you dependable performance in demanding electrical systems. With digital flexibility and proven Siemens technology, the SIPROTEC 7SJ overcurrent protection relays are trusted by engineers worldwide for safe and efficient power distribution.
Key Features and Functions
The SIPROTEC 7SJ overcurrent protection relays are built for flexibility and ease of configuration. Whether you are protecting feeders, cables, or lines, this device adapts to your system setup through the DIGSI 5 engineering software.
Some of the main features include:
● Feeder and overcurrent protection with directional and non-directional functions
● Ground fault detection for isolated and compensated networks
● Voltage and frequency protection options for complete system coverage
● Arc protection to reduce the risk of internal faults
● Programmable logic to customize control and automation functions
These features help ensure a stable power network, minimize downtime, and keep your system safe from electrical disturbances.
Applications of SIPROTEC 7SJ Relays
You can use the SIPROTEC 7SJ relays in a wide range of power systems, including:
● Medium-voltage feeders and substations
● Industrial distribution networks
● Transformer and generator protection
● Cable and overhead line systems
Each device provides dependable overcurrent and short-circuit protection, ensuring consistent performance even in complex electrical environments.
Model Range and Technical Specifications
The SIPROTEC 7SJ series includes various models tailored for different setups. Each unit offers multiple configurations for current and voltage transformers, inputs, and outputs.
Typical configurations include:
● 4 current transformers with 11 to 18 binary inputs and 9 to 14 binary outputs
● Optional four-voltage transformer inputs for advanced voltage protection
● Modular housing in a 1/3 × 19-inch design for compact panel installation
● Easy connection through Siemens SIPROTEC 7SJ I/O modules
These I/O modules allow you to expand or adapt the relay’s functions as your system requirements change, keeping your network flexible and reliable.
Benefits and Advantages
When you choose the SIPROTEC 7SJ overcurrent protection relay, you get:
● High reliability for medium-voltage protection
● Compact design that saves space in control panels
● Simple setup through the DIGSI 5 software
● Flexible I/O configuration for different system demands
● Long service life backed by Siemens quality
This series combines advanced engineering with ease of use, making it a dependable choice for modern power systems.
Why Choose HONGKONG XIEYUAN TECH CO., LTD for SIPROTEC 7SJ Relays
We supply genuine Siemens protection relays, including the full range of SIPROTEC products and Siemens SIPROTEC 7SJ I/O modules. Our team ensures that every product meets international quality standards and is delivered with complete technical support.
When you work with us, you can expect:
● Original Siemens components
● Professional product guidance
● Fast global shipping and after-sales assistance
We help you find the proper protection relay for your system so that your operations run smoothly and safely.