Siemens SIPROTEC 6MD665, Manual

Page: 21 / 222

1.3 Characteristics
7
6MD665 Manual
C53000-G1876-C103-3
1.3 Characteristics
General Character-
istics • Powerful 32-bit microprocessor system.
• Communication with the switchgear bay via a process bus interface.
• Complete digital processing and control of measured values, from the sampling of
the analogue input quantities to the initiation of outputs for, as an example, tripping
or closing circuit breakers or other switchgear devices.
• Total electrical separation between the internal processing stages of the device and
the external transformer, control, and DC supply circuits of the system because of
the design of the binary inputs, outputs, and the DC converters.
• Complete set of functions necessary for the proper control of feeders or busbars.
• Easy device operation through an integrated operator panel or by means of a con-
nected personal computer running DIGSI.
• Continuous calculation and display of measured and metered values on the front of
the device
• Constant monitoring of the measurement quantities, as well as continuous self-
diagnostics covering the hardware and software.
• Communication with SCADA or substation controller equipment via serial interfaces
through the choice of data cable, modem, or fibre optics.
• Optional for direct communication between the devices, regardless of their connec-
tion to the control center.
• Battery-buffered clock that can be synchronised with an IRIG-B (via satellite) or
DCF77 signal, binary input signal, or system interface command.
• Commissioning aids such as connection check, status indication of all binary inputs
and outputs, easy check of system interface and influencing of information of the
system interface during test operation
Synchronisation of
the circuit breakers • Checking of the synchronisation conditions of both subnetworks.
• Differentiation between synchronous and asynchronous networks.
• Consideration of the circuit breaker operating times with asynchronous networks.
• Saving of up to eight parameter sets for synchronisation to be able to consider the
differing properties of circuit breakers.
Control • Communication with the equipment to be controlled via process bus.
• High security against incorrect switchings via system and bay related interlocking
checks, including the information of neighbouring bays via inter relay communica-
tion.
• High variance with regard to switchgear types and operating modes.
Switching author-
ity and switching
mode • Keylock switches for defining the control authority and the control mode.
• Logging keylock-switch positions.
Measured values • Connection of measured values in accordance with one- or three-phase system or
Aron connection.