Siemens Siprotec 5 7SA87 Distance Protection Relay

The SIPROTEC 7SA87 Distance Protection Relay is part of the advanced SIPROTEC 5 Protection Relay Series, which consists of modular, flexible, and intelligent digital field devices. Moreover, this relay is designed to meet the protection requirements of modern electrical networks. Additionally, its modular architecture allows easy adaptation to various substation configurations.

Furthermore, with its flexibility and the high-performance DIGSI 5 Engineering Tool, the SIPROTEC 7SA87 fits perfectly for protection, control, monitoring, and measuring applications in electrical energy systems. As a result, utilities and industries can enhance grid reliability and operational efficiency.

Main Function

• Firstly, distance protection ensures accurate fault detection and isolation in transmission networks.

Tripping

• Additionally, the relay supports both 1-pole and 3-pole tripping.

• Moreover, it offers a minimum tripping time of 9 ms. Therefore, faults can be cleared quickly to maintain power system stability.

Inputs and Outputs

• The device provides 12 predefined standard variations with 4/4 or 8/8 current and voltage transformers.

• Additionally, it supports 5 to 31 binary inputs.

• Also, it includes 8 to 46 binary outputs, allowing flexible integration with control and monitoring systems.

Hardware Flexibility

• In addition, the relay features a flexibly adjustable I/O quantity structure within the scope of the SIPROTEC 5 modular system. Consequently, engineers can configure the device according to project requirements.

Housing

• Finally, the housing width ranges from 1/3 × 19” to 2/1 × 19”, therefore enabling convenient installation in various panel configurations.

All functions can be configured freely with DIGSI 5. For the application of some of the functions, you require the appropriate number of free function points within the device. The function point calculator in the online configurator provides support in determining the required number of function points for your device.

Function

• Minimal tripping time: 9 ms for extremely fast fault clearing.

• Supports six independent measuring loops for advanced 6-system distance protection.

• Offers multiple distance protection methods, including classic, reactance (RMD), and transformer impedance protection.

• Provides directional backup protection with several additional protective functions.

• Detects ground faults in isolated or arc-suppression-coil grounded systems using 3I0>, V0>, Cos/Sin Phi, harmonic, and admittance methods.

• Supports directional detection of intermittent ground faults for improved system reliability.

• Includes ground fault detection through the pulse location method.

• Detects current-transformer saturation to ensure fast and accurate tripping.

• Features adaptive power-swing blocking and out-of-step protection to maintain system stability.

• Includes arc protection for enhanced equipment safety.

• Provides automatic frequency relief for load shedding during underfrequency events.

• Considers changing infeed conditions due to decentralized power generation.

• Offers power protection configurable as active or reactive power protection.

• Includes reactive power undervoltage protection (QU protection).

• Measures current and voltage signals up to the 50th harmonic for precise monitoring and protection.

• Three-pole automatic reclosing functions for improved network reliability.

• Provides control functions, synchrocheck, and switchgear interlocking protection.

• Features a graphical logic editor for creating powerful automation functions.

• Displays single-line diagrams on small or large integrated device displays.

• Includes integrated Ethernet RJ45 ports for DIGSI 5 engineering and IEC 61850 communication.

• Supports up to four pluggable communication modules for IEC 61850, IEC 60870-5-103/104, Modbus TCP, DNP3, and PROFINET IO.

• Enables secure communication via optical fiber, two-wire links, and communication networks.

• Allows automatic switchover between ring and chain network topologies.

• PRP and HSR redundancy protocols.

• Includes cybersecurity features aligned with NERC CIP and BDWE standards.

• Functions as a Phasor Measurement Unit (PMU) with IEEE C37.118 support.

• Supports precise time synchronization using IEEE 1588.

• Provides fault recording up to 80 seconds at 8 kHz or 320 seconds at 2 kHz.

SIPROTEC 7SA87 Distance Protection Relay

SIPROTEC 5 is part of the new generation of incomparable modular, flexible, and intelligent digital field devices. Additionally, With modularly designed hardware and software and its high-performance DIGSI 5 engineering tool, the SIPROTEC 5 product family of field devices are perfect for protection, control, monitoring, and measuring applications in electrical energy systems. Moreover, SIPROTEC 5 offers a wide product range with modular elements for every application and requirement.