NHP Terasaki TemBreak PRO P SE Series, User Manual

Page: 47 / 122

Protection Settings
47
TemBreak PRO
P_SE-UM-001-EN
– V1.2.0
Setting the ZSI function
The P250SE / P400SE / P630SE MCCB must activate the ZSI protection to acknowledge selectivity per zone and respond according to any signals
received on ZSI
1
.
Changes to the settings of each of the ZSI functions can be made using one or a combination of the below methods:
-
P_SE OCR embedded display
-
TPED
-
TPCM
P_SE OCR embedded display
setting TPED setting TPCM setting Default
OFF: ZSI for STD disabled
ON: ZSI for STD enabled
“ZSI – Short”
Off: ZSI for STD disabled
On: ZSI for STD enabled
Command ID: 208 “Zone interlocking ( ZSI) for STD ”
Hex 00 00: ZSI for STD disabled
Hex 00 01: ZSI for STD enabled
ZSI for STD disabled
OFF: ZSI for GF disabled
ON: ZSI for GF enabled
“ZSI – Ground”
Off: ZSI for STD disabled
On: ZSI for STD enabled
Command ID: 214 “Zone interlocking ( ZSI) for GF”
Hex 00 00: ZSI for STD disabled
Hex 00 01: ZSI for STD enabled
ZSI for GF disabled
The P160SE MCCB is mainly designed to protect the feed circuit and thus does not require a ZSI signal from a downstream circuit breaker to be
acknowledged, therefore it does not have a ZSI input (ZSI
1
) does not feature any ZSI configurability. It is equipped with a ZSI output (ZSI
2
) to connect an
upstream circuit breaker, still produce the ZSI signal on ZSI2 when a short-time or ground-fault event is detected.
ZSI Port P160 P250 P400 P630
ZSI
1
(Input)
─
✓ ✓ ✓
ZSI
2
(Output)
✓ ✓ ✓ ✓
Installation consideration
There is no limit to the number of interconnected upstream and downstream circuit breakers using the ZSI signalling interface; however the reliability of the
ZSI signal is dependent on the total impedance of the interconnecting cabling. Therefore, the total impedance of the ZSI signalling cables and intermediate
wiring and terminations must be considered.
Total impedance is dependent on wire type, length, material, and gauge of all interconnecting wires and termination devices (e.g. terminal blocks and
connectors).
The maximum permissible characteristics for the ZSI signalling cable for the total length is as follows:
Specification Value
Max length 1000 m
Max impedance 30 kΩ
Physical installation of the ZSI signalling cabling shall be considered. Ensure that the cables are mechanically protected from physical damage.
Ensure appropriate clearances and/or shielding of cables when run in proximity to other high-power conductors to avoid induced voltages and
electromagnetic interference on the ZSI signal interface.
Notice : If the ZSI function is not in use, it is important to ensure that ZSI function settings on applicable
upstream MCCBs remain disabled. If the ZSI function is left enabled without a ZSI
1
input signal, the upstream
MCCB, upon fault current detection, will override any intended selectivity settings and attempt an instantaneous
trip. This may result in nuisance tripping and disruption of other services.