Numerical overhead contact line protectionfor AC traction power supply
The numerical overhead contact line protection relay Siprotec 7ST61 / 7ST63 is a selective and quick responding protection device for overhead contact lines fed from one or multiple points in AC traction power supplies.
The relay possesses all functions required to protect a section of the overhead contact line and can therefore be deployed universally.
The Siprotec 7ST61 / 7ST63 numerical overhead contact line protection relay is a member of the Siprotec 4 product family, which stands for excellent quality and powerful protection relays and is characterized by the following features:
Powerful 32-bit microprocessor system
Completely numerical data processing and control, from the measurement of voltages and currents to the switching decision logic of the circuit-breaker
Complete galvanic and interference-immune isolation of the internal processing circuitry from the measurement, control and power supply circuits of the switchgear via measured value trans formers, binary input and output modules, and DC and AC voltage converters
Simple operation via integrated operator panel or connected personal computer with operating software Digsi 4
Storage of fault indications and instantaneous values for fault recording
An integrated equipment concept arises from integration into the Siprotec family, e. g. with line, transformer and busbar differential protection.
Integration of protection, control, measurement and automation functions into a single unit
Shortest tripping times due to adaptive protection algorithms
Efficient operation due to a universal tool for all tasks
Adaptation to different modes by parameter-set switchover
Flexible availability of all common communication protocols
Distance protection (21)
Time overcurrent protection (50/51)
Emergency time overcurrent protection (51)
Thermal overload protection (49)
Defrosting protection (87) (depending on product
Trip circuit supervision (74TC)
Closing and opening of switching devices manually via local control keys (7ST63), programmable function keys, via the system interface (e. g. station control system SitrasR SCS or IEC 61850) or via the operator interface (by means of personal computer and Digsi 4 operator program)
Feedback of the switching states via the CB auxiliary contacts (for commands with feedback)
Plausibility monitoring of circuit-breaker positions and interlocking conditions for switching
Monitoring of internal measuring circuits, the a uxiliary power supply and the hardware and software, thus increasing reliability
Monitoring of the signal of the overhead line voltage (fuse failure monitoring)
Monitoring of ambient temperature sensing
Monitoring of the tripping circuit p ossible
Display of the operational impedances and direction
Freely programmable combinations of internal and external signals to implement user-defi nable logic functions in CFC
All common logic functions
Delay times and limit queries
Battery-backed clock that can be synchronized via the synchronization signal (DCF 77, IRIG B by means of satellite receiver), binary input or system interface
Constant calculation and indication of the operating measurements on the front display
Writing of all parameters into a non-volatile memory so the setting values are retained even in the event of auxiliary power failure
Fault value storage for the last eight power system faults (fault in the network), with real-time assignment
Event store for storing the last 200 operational and 80 fault indications
Communication with the control system possible via serial interfaces (depending on order variant), or optionally via data line, modem, or fi ber-optic cable
Commissioning aids such as connection and direction check and circuit-breaker check
High-speed overcurrent protection (50HS)
Voltage protection (27/59)
Circuit-breaker failure protection (50BF)
Automatic reclosure function (79)
Synchronism and voltage check (25)
Calculation of the circuit-breaker load
Four serial interfaces are available for communication
with external operating and control systems.
- Operator interface (front side)
- Service interface
- System interface
- Interface for time synchronization
Siprotec 7ST6 can be operated via
the operator panel on the front of the unit or
the Digsi 4 user interface of your PC connected locally to the operator interface or via modem to the service interface of the relay.
Siprotec 7ST6 operator panelRoutine operator actions can be performed while using the on ergonomic principles designed operator panel as well as settings of individual parameters and display information required for network management and general diagnostics can be made.
Depending on the version, the operator panel of the relay can be arranged as a 4-line display or a graphic display.
Digsi 4 operating and diagnostics software on PC
Digsi 4 can be used for easy parameterization and operation of the Siprotec devices on a PC.
Digsi 4 uses Windows techniques familiar from other applications for operator guidance. So the operator is working in a familiar system environment.
On the user interface only device-specifi c relevant parameters are offered during confi guration and routine operation.
Numerous tools, such as context menus, dropdown lists for selection, permissible parameters, limit setting for digital values, and tooltips make an easy parameterization of the Siprotec devices possible.
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