SIPROTEC 7VE85 Numerical Relay

paralleling device siprotec 7ve85 is specifically designed for the synchronization of generators (power plant units) with the power grid or synchronization of 2 electricity-supply systems.

the 1.5- and 2-channel synchronization function is the made function of the siprotec 7ve85. To warrant a high level of security and reliability, the software works with various monitoring functions. In addition, the most important hardware components are duplicated. Two different measuring algorithms are used in accordance with the multi-channel redundancy. This avoids overfunctions through systematic errors. At the same time, the different methods of measurement are applied and processed independently of each other with different memory areas. The high level of reliability and flexible options to adapt to the equipment requirements allow a wide variety of applications.

function

digsi 5 permits all functions to be configured and combined as required.

• stabilization function for the output of adaptive frequency control pulses
• synchrocheck function for manual synchronization
• analog output of operational measured values*
• commissioning (measurement of the operating time of the circuit breaker, sample synchronization)
• functionality for protection and network decoupling tasks
• undervoltage protection (ansi 27)
• overvoltage protection (ansi 59)
• voltage differential protection (ansi 60)
• overcurrent protection (ansi 50/51)
• vector jump
• overfrequency (ansi 81)
• underfrequency (ansi 81)
• rate-of-frequency-change protection (ansi 81r)
• instantaneous high-current tripping (ansi 50hs)
• instantaneous tripping at switch upon error
• power protection active/reactive power (ansi 32/37)
• power-plant disconnection (ansi 37)
• circuit-breaker failure protection (ansi 50bf)
• circuit breaker reignition monitoring (rbrf)
• extensive cyber security functionality, such as role-based access control (rbac), protocolling security-related events or signed firmware
• simple, quick and secure access to device data via a standard web browser – without additional software