Monitoring
Overview
The monitoring functions of the device are as follows:
•
Operating voltage
All outgoing information (TX and command outputs) are blocked as long as the operating voltages of the
equipment are not within the specified ranges.
•
Switching command duration
If a switching command with a duration of > 500 ms is received, the command outputs are disabled and
an alarm is triggered. The switching command duration can be configured.
•
Guard tone failure alarm
If there is no valid command frequency present, a guard tone failure alarm is triggered after about 10 ms.
•
Signal to Noise (S/N) ratio
If the configured threshold of the S/N ratio is exceeded, a signal to noise alarm can be triggered. During
alternate multi-purpose operation the S/N supervision is not performed.
•
Transmit level monitoring
The level of the transmit amplifier is monitored.
•
Operating state
The operating state of the device is displayed on the front panel with differently colored LED.
•
Control contacts for external equipment
A floating make contact or break contact (alarm contact) is available at the device terminals for signaling
the following alarms:
–
Non-urgent alarm (NU-alarm, NUALR, or NDALR)
–
Receiver alarm (RXALR or EALR)
–
General alarm (GALR or GENALR)
•
Signaling modules IFC-S can be provided additionally as an option. With the aid of this module, any oper-
ation of the local circuit can be signaled externally via an auxiliary contact.
i
i
NOTE
Maximum 2 IFC-S modules are possible.
•
Measuring options
Decoupled measuring points at which the operating values can be monitored are arranged on the
modules for start-up and maintenance of the unit.
•
Input pulse suppression
In order to be accepted as an input signal, commands must be applied at the input for at least 1 ms. You
can increase this minimum time to 100 ms in steps of 1 ms. The input pulse suppression can be config-
ured.
•
Minimum transmission duration
Each command is transmitted for at least 15 ms. The minimum transmission time can be configured.
2.6
Functional Description
2.6 Monitoring
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
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C53000-G6040-C605-1, Edition 03.2020