ABB Switzerland Ltd 1KHW001489-EN ETL600
• G4AI interface alarm
• TPE alarm, TPE link alarm, TPE hardware alarm
• User alarm 1 or 2
If more input/output contacts are needed to convey the above
mentioned signals or for duplicating the command I/Os for example
(redundancy or double-pole tripping), further G4AI modules can
simply be inserted into the rack (slot number according HMI600).
The command interfaces to the protection relays are potential-free
and isolated from ground and all other circuits. The command and
alarm signals are connected to isolating terminals (4 mm
2
) by
special connecting cables which plug into the rear of the
teleprotection interfaces.
• Command outputs during channel alarm
By means of the HMI600 interface, the user can program how the
command outputs respond to a channel failure, i. e. to SNR alarm
or Rx level alarm:
• alarm does not influence output
• alarm sets output to guard state
• received commands are “frozen” at the outputs in case of an
interrupted or disturbed link
• alarm sets command outputs for direct tripping to guard state
and command outputs for permissive tripping or blocking to
command state
• Easy to test
Cyclic and manual loop tests allow in-service testing of the
teleprotection channel. Self-monitoring arrangements continuously
determine the operational status of the equipment.
• Element Management Networks
An embedded operation channel (EOC) allows remote NSD600
configuration and monitoring from one end.
When the ETL600 equipment is integrated in a network
management system, each NSD600 can be accessed with HMI600
via a unique equipment identification number.
An optional LAN interface is available for remote access to the
equipment via the Internet or a Corporate Network (Intranet).
3.6.5. Applications
The NSD600 is designed for transferring commands in blocking,
permissive tripping and direct transfer tripping schemes. Its four
commands are independent from each other regarding the application
requirements and they can be transmitted simultaneously in any
possible combination.
One teleprotection interface type G4AI provides four opto-coupler
inputs and four solid-state outputs plus two heavy duty (electro-me-
chanical) relay outputs with change-over contacts. The inputs / outputs
3-58 November 2005 Structure and Function
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