Communication Structure For Laboratory Testing; Communication Status And Fault Tracing; Communication Status On The Line Differential Protection Ied - Hitachi 670 Series Application Manual

Section 5
Communication set-up
5.6.8

Communication structure for laboratory testing

During back-to-back laboratory testing, one transceiver 21-219 must be set as master. This is done
by turning the rotary switch on the transceiver's front panel to position 1 (EXT CLK) (LED 1 is lit and
LEDs 2, 4 and 8 are not lit).
5.7

Communication status and fault tracing

5.7.1

Communication status on the line differential protection IED

Communication status can be monitored on the line differential protection IED's local HMI under
Main menu /Test /Function status /Communication /Remote communication . The information is
also useful for fault tracing purposes.
Example of transmission delay and asymmetry information on the local
HMI
0.4 ms transmission delay and 3.5 ms asymmetric delay in test set-up
IEC08000440 V1 EN-US
Figure 88:
Table 26:
Echo mode
Setting in IED A
AsymDelay
Table 27:
Echo mode
Service values in IED A
TransmDelay
AsymDelay
Table 28:
GPS mode
Service values in IED A
TransmDelay
AsymDelay
86
IED A
Example test set-up with specified transmission and asymmetric delays
Asymmetric delay settings in echo mode
–3.1 ms
Transmission and asymmetric delay values in echo mode
0.4 ms
–3.1 ms (same as set
value)
Actual transmission and asymmetric delay values in GPS mode
0.4 ms
–3.1 ms
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GUID-EEB88BED-45BA-4C38-BAEE-0DECCB003314 v1
GUID-36DB09A7-DFD0-4E5A-9475-6FBF9D1BACB2 v1
IED B
IEC08000440-1-en.vsdx
Setting in IED B
AsymDelay
Service values in IED B
TransmDelay
AsymDelay
Service values in IED B
TransmDelay
AsymDelay
Communication set-up, 670/650 series
1MRK505382-UEN Rev. K
3.1 ms
3.5 ms
3.1 ms (same as set value)
3.5 ms
3.1 ms
Application Guide