External Teleprotection Device Nsd570/Nsd70C; Guard Signal Of External Nsd570/Nsd70C; Command Signal Of External Nsd570/Nsd70C - ABB ETL600 Instruction Manual

ETL600
Available Channels
APLC1
DPLC
APLC1, DPLC
APLC1, APLC2
APLC1, APLC2, DPLC
APLC1, APLC2, APLC3
APLC1, APLC2, APLC3, DPLC
Table 5-3
Remark to Table 5-3:
1) TPE2 is not available when ETL600 is configured for 3 APLC
channels in 8 kHz (refer to Table 3-1).
5.2.15.

External teleprotection device NSD570/NSD70C

The AF signals for NSD570/NSD70C are connected to O4LE ports
configured for external teleprotection. Only one port per O4LE board –
namely port AF4 - can be configured as external teleprotection port.
The boost command is applied to the external boost input of the
respective O4LE board. Only one NSD570/NSD70C per channel can
be boosted. The priority rules for boosting are given in section
5.2.16.2.
5.2.15.1.

Guard signal of external NSD570/NSD70C

The NSD570/NSD70C signal in the quiescent state, called the guard
signal, has a system level of -6 dBm0 per default. Without boosting,
the level of the NSD570/NSD70C tripping signal is also -6 dBm0. The
internal boosting facility of the NSD570/NSD70C has to be disabled for
operation over an ETL link. Instead, the boosting is performed by the
ETL600 when the external boost input is activated. The boost ratio
used by ETL600 for boosting of the NSD570/NSD70C tripping signal is
calculated automatically by the HMI600 program.
Note:
5.2.15.2.

Command signal of external NSD570/NSD70C

It is assumed that the Tx trip duration monitoring is enabled in the
external teleprotection device and the guard signal is transmitted
instead of the tripping signal should the command duration exceed the
predefined value. It is further assumed that the boost criterion of the
external teleprotection device is set inactive after the allowed Tx trip
duration time.
Configuration and Set-up
1KHW001489-EN
Channel of TPE 1
Association of internal TPEs to channels
As mentioned in Section 5.2.12 and 5.2.13 the
NSD600 guard gets a higher weight when a strong
MOD600 signal is present.
It is recommended to assign the same weight also to
the NSD570/NSD70C guard signal when configuring
the teleoperation port (by means of the HMI600, refer
to Section 5.3.4.5).
ABB Switzerland Ltd
Channel of TPE 2
APLC1
DPLC
APLC1 DPLC
APLC1 APLC2
APLC1 APLC2
APLC1 APLC2
APLC1 APLC2
November 2005
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