ABB RET670 Product Manual page 75

ABB
Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Basic IED functions
Table 73. Self supervision with internal event list
Data
Recording manner
List size
Table 74. 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 75. GPS time synchronization module (GTM)
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 76. GPS – Antenna and cable
Function
Max antenna cable attenuation
Antenna cable impedance
Lightning protection
Antenna cable connector
Accuracy
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
+/-2μs
1MRK 504 118-BUS A
Value
1 ms
± 1.0 ms typically
± 1.0 ms typically
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