Product
Does 7SY82 support functions like 32, 25, etc.? Or it will be necessary to use an additional device?
In the first release, the 7SY82 will support most of the protection functions required by a Feeder bay. Additional functionality to cover motor, capacitor bank, line and transfromer applications will be released stepwise in upcoming firmware versions. A complete list of the available functions can be found in the function points calculator inside the SIPROTEC 5 configurator.
Is there monitoring for LPCT/VT circuits in case of for example disconnection of circuits?
The SIPROTEC 5 7SY82 will include monitoring functions of secondary circuits to signal a warning in case of errors in the system.
Does 7SY82 has a Local/remote switching via key-operated switch, as available in Siprotec 4 series?
Local/Remote is possible through the menu. Key-switches are available only for the SIPROTEC 5 modular devices.
Does 7SY82 have UL Certification?
It is planned to have the SIPROTEC 7SY82 UL certified. The product information will be adapted and published after successful certification.
Can the 7SY82 be used as a Merging Unit like the 6MU85?
The SIPROTEC 7SY82 will not support process bus functionality for the first release. However, it is planned to integrate process bus into the non-modular SIPROTEC 5 platform. This implementation will be completed in the foreseeable future and will be communicated according to the completion. After this implementation it will be possible to use the 7SY82 also as a merging unit.
Communication
Does 7SY82 support sample measured values with 256 sample according to IEC 61850-9-2?
The SIPROTEC 7SY82 does not support process bus functionality for the first release. However, it is planned to integrate the process bus functionality in the near future into the non-modular SIPROTEC 5 platform.
Is the 7SY82 compatible with BACNET to interface with Building management system BMS?
SIPROTEC 5 does not support the BACNET protocol. For a list of supported protocols please check SIPROTEC 5 documentation.
Sensor
Is there a limited length of the LPIT cable? Normally, on Generator protection the CV/VT can be very far away from the protection relay?
For our application with RJ45 connectors to the protection device, the cable length to the LPIT is limited to 10m. This is described in the standard IEC 61869-13.
How is EMC affected and what is the impact of voltage drop when using Cat5 or Cat6 cable for low-power signals?
In comparison to the conventionals, the IEC 61869 standard family imposes more rigorous requirements on LPITs. Consequently, LPITs undergo through performance verification in all aspects for their application. In addition only CAT7/CAT8 cables are used for the connection between our sensors and protection device.
Is the 7SY82 compatible with Rogowski coils and LPCTs from any vendor?
We are aiming to offer the 7SY82 for ‘any’ type of sensor that is complying with the IEC 61869 standards and whose secondary values fit to the input module of our device.
Compatibility tests with some sensors of ABB, Zelisko, Greenwood Power and others are being run. A compatibility list will be released when finished and will be available in the SIOS portal
Can voltage sensor be connected in parallel to several 7SY82?
An application like this will be neither possible with SIEMENS sensors nor with other vendors' sensors. The technical reason for this is that all voltage sensors compatible with the 7SY82 are based on a voltage divider principle. Those R- or C-dividers are always designed for one connected measuring device to transmit accurate secondary values to the device. Connecting several devices to one sensor will lead to a larger voltage drop on the secondary side which leads to wrong measured values on the device.
So, connecting voltage from one sensor to many devices like a conventional voltage transformer will not be possible. This is a known issue and will be solved by adding process bus support to the non-modular devices.
However, the price of voltage sensors compared to conventional VTs can be lower so that it might be affordable for the customer to add voltage measurement into multiple bays.
We know that secondary value of LPCT and VT is measured in millivolts and volts. As the values that we get are small and sensitive, is there a danger of being exposed to external influences, such as nearby alternating current cables? Is it a special cable for withstanding external influences that we connect LPCT/VT with 7SY82?
In comparison to the conventionals, the IEC 61869 standard family imposes more rigorous requirements on LPITs. Consequently, LPITs undergo thorough performance verification in all aspects for their application. In addition only CAT7/CAT8 cables are used for the connection between our sensors and protection device.
What are the part numbers of the LPIT from Siemens compatible with the 7SY82?
There is a solution for Siemens GIS and AIS switchgears. GIS uses a Bushing with integrated Rogowski Coil for current measurement and a C divider for voltage measurement. AIS sensor is similar but consist of Rogowski coil and R divider. Those sensor are part of the respective Siemens switchgear.
For the connection of the 7SY82 to the Rogowski coil or the CT (or to test box), please advise if special cable is used (and provide the part number) and/or can any standard RJ-45 cable be used? Alternatively, if the Rogowski coils are not Siemens part numbers, can we use a part number from other source that is compatible with the 7SY82?
Usually, the vendor of the sensor needs to provide a sufficient cable for the connection of a sensor to the device (or the box). If the sensor is from Siemens, cable will be provided. However, it is very important that the pin assignment from the sensor fits to our input RJ45 sockets. In the sales slides there is one page with a detailed assignment of the pins.
The Test Box will be provide with a cable for connection to the device (will be available in 1m or 2m length).
Are SIBushings precise enough to detect the High impedance ground fault in compensated grid given that the ground current is derived from all 3-phase SIBushings. Any plans to implement SIbushing for measured ground current?
High Impedance Ground faults will still require seperate cable core current sensor. 7SY82 provides a separate measurement input for such kind of sensors. Compatibility tests with some sensors of Zelisko, Greenwood Power and others are being run. A compatibility list will be released when finished and will be available in the SIOS portal.
Testing
Will it be possible to test a 7SY82 relay when the panel is already in service?
For testing it is foreseen a test box that allows the set up for normal operation and test scenarios. The injection of the analog signals shall be granted from secondary injection devices available in the market.
How do you test relay functions in a 7SY82?
Well-known manufacturers of secondary test devices already have solutions for testing protection devices with LPIT connections in their portfolio or are working on them.
With the combination of CMC430 and LLX1, Omicron offers a solution for testing the SIPROTEC 7SY82.
Application
From the introduction document I know that 7SY82 relay has most of protection functions for line and motor. Will transformer differential protection be added to 7SY82 relay also?
In the first release, the 7SY82 will support most of the protection functions required by a Feeder bay. Additional functionality to cover motor, capacitor bank, line and transfromer applications will be released stepwise in upcoming firmware versions. A complete list of the available functions can be found in the function points calculator inside the SIPROTEC 5 configurator.
Is the voltage measurement through capacitive voltage divider accurate enough for earth fault detection in compensated network ? According to our customers, it is a technical challenge!
Yes, it can be accurate enough. For that, individual sensor calibration and temperature compensation (measurement), as available with the Siemens SIBushing, are required.
What is the lpit / universal relay solution for busbar protection and internal arc detection?
The SIPROTEC 5 platform support arc detection plug-inmodules that can be connected to the protection devices. Those modules will be supported by the SIPROTEC 7SY82. This solution is independent of the instrument transfomer technology used.
Regarding busbar protection it is possible to use the universal protection device 7SX85 as a merging unit with LPIT connections via the available LPIT input modules (IO240).
As processbus will not be available on the 7SY82 from the beginning, it can not be used as a merging unit for decentral busbar application. Once process bus functionality is supported this application will be possible.
Is this protection device applicable for the protection functions of a MV diesel/gas generators?
In the first release, the 7SY82 will not cover generator specific protection functions. In the first release, the 7SY82 will support most of the protection functions required by a Feeder bay. Additional functionality to cover motor, capacitor bank, line and transfromer applications will be released stepwise in upcoming firmware versions. A complete list of the available functions can be found in the function points calculator inside the SIPROTEC 5 configurator.
