ABB RET670 Product Manual page 83

ABB
Transformer protection RET670
Pre-configured
Product version: 1.1
Basic IED functions
Table 84. Self supervision with internal event list
Data
Recording manner
List size
Table 85. Time synchronization, time tagging
Function
Time tagging resolution, events and sampled measurement values
Time tagging error with synchronization once/min (minute pulse
synchronization), events and sampled measurement values
Time tagging error with SNTP synchronization, sampled
measurement values
Table 86. GPS time synchronization module (GSM)
Function
Receiver
Time to reliable time reference with
antenna in new position or after power
loss longer than 1 month
Time to reliable time reference after a
power loss longer than 48 hours
Time to reliable time reference after a
power loss shorter than 48 hours
Table 87. GPS – Antenna and cable
Function
Max antenna cable attenuation
Antenna cable impedance
Lightning protection
Antenna cable connector
Value
Continuous, event controlled
1000 events, first in-first out
Range or value Accuracy
– ±1µs relative UTC
<30 minutes –
<15 minutes –
<5 minutes –
Value
26 db @ 1.6 GHz
50 ohm
Must be provided externally
SMA in receiver end
TNC in antenna end
1MRK 504 091-BEN B
Issued: June 2010
Value
1 ms
± 1.0 ms typically
± 1.0 ms typically
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