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 sametime, 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.
1.5- and 2-channel synchronization function
Inputs and outputs
2 predefined standard variants with up to 8 current transformers, 8 voltage transformers, 7 to 15 binary inputs, 14 to 20 binary outputs
Flexibly adjustable and expandable I/O quantity structure within the scope of the modular SIPROTEC 5 system; 1/6 expansion modules can be added, available with large or small display, or without display
Width of housing
1/3 × 19 inches to 2 × 19 inches
The SIPROTEC 7VE85 recognizes the operating conditions automatically and reacts in accordance with the settings. In“Switching synchronous electrical power systems” operating mode the frequency difference is measured with a high level of accuracy. If the frequency difference is almost zero for a long time, this is referred to as a synchronous electrical powersystem, for which a wider switching angle can be permitted.
If asynchronous conditions occur, such as when synchronizing the generators, the speed is automatically adjusted to the power frequency and the generator voltage in an electrical power system. It is then switched, taking into consideration thesynchronization in accordance with the circuit breaker closing time.
The 1.5-channel parallel switching function (synchronization function and synchrocheck) is provided for use in small tomedium-sized generators and in electrical power systems. This function is more secure than a 1-channel paralleling device and can also be used for synchrocheck applications. For larger Generators and electrical power systems with high safety requirements, the 2-channels parallel switching function is recommended.In this example two distinctly independent methods of measurement decide on the switching conditions.
Furthermore, SIPROTEC 7VE85 offers additional current, frequency, power and voltage protection functions and manyother control and monitoring functions. As a result, the paralleling device offers synchronization and protection functions in a single device. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7VE85 device offers future-oriented system solutions with high investment security and low operating costs.
The following modes of operation are covered:
Switching synchronous/asynchronous electrical power systems
Switching to de-energized line or dead busbar
Adjusting commands for voltage and frequency (speed)
Safe and reliable synchronization of generators and electricity-supply systems by multichannel redundancy
Purposeful and easy handling of devices and software thanks to a user-friendly design
Cost savings as no external switchover of synchronization and voltage measuring points is required
Cyber security in accordance with NERC CIP and BDEW Whitepaper requirements
Highest availability even under extreme environmental conditions by “conformal coating“ (coating) of the modular assemblies (being prepared)
Powerful communication components warrant safe and effective solutions
High investment security and low operating costs due to future-oriented system solutions
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)
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
Synchronization of generators (power plant units) with the electricity-supply system under consideration of the vector group of transformers and transformer tap*
Synchronization of 2 electricity-supply systems
Operation of up to 8 synchronizing points without external switchover
* being prepared