ABB Relion 670 Series Applications Manual page 497

1MRK 505 370-UUS Rev. K
Magnetic or capacitive voltage transformers can be used.
The capacitive voltage transformers (CCVTs) should fulfill the requirements according to the IEC 61869-5
standard regarding ferro-resonance and transients. The ferro-resonance requirements of the CCVTs are
specified in chapter 6.502 of the standard.
The transient responses for three different standard transient response classes, T1, T2 and T3 are
specified in chapter 6.503 of the standard. CCVTs according to all classes can be used.
The protection IED has effective filters for these transients, which gives secure and correct operation with
CCVTs.
21.3 SNTP server requirements
The SNTP server to be used is connected to the local network, that is not more than 4-5 switches or
routers away from the IED. The SNTP server is dedicated for its task, or at least equipped with a real-
time operating system, that is not a PC with SNTP server software. The SNTP server should be stable,
that is, either synchronized from a stable source like GPS, or local without synchronization. Using a local
SNTP server without synchronization as primary or secondary server in a redundant configuration is not
recommended.
21.4 PTP requirements
For PTP to perform properly, the Ethernet equipment that is used needs to be compliant with IEEE1588.
The clocks used must follow the IEEE1588 standard BMC (Best Master Algorithm) and shall, for
instance, not claim class 7 for a longer time than it can guarantee 1us absolute accuracy.
21.5 Sample specification of communication requirements for
the protection and control terminals in digital
telecommunication networks
The communication requirements are based on echo timing.
Bit Error Rate (BER) according to ITU-T G.821, G.826 and G.828
•
<10
Bit Error Rate (BER) for high availability of the differential protection
•
<10
•
<10
During disturbed conditions, the trip security function can cope with high bit error rates up to 10
-4
up to 10
protection communication supervision, or blocked when COMFAIL is issued after receive error >100ms.
(Default).
Busbar protection REB670
Application manual
The IED supports SNTPv4 (RFC2030).
-6
according to the standard for data and voice transfer
-8 -9
-10 during normal operation
-6
during disturbed operation
. The trip security can be configured to be independent of COMFAIL from the differential
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Section 21
Requirements
GUID-588FCD12-C494-445E-8488-8287B34EFD9A v5
GUID-741CC863-D760-49D6-85B2-AFECA222A8C3 v1
GUID-0A9F36AF-3802-42FE-8970-4662798C19D1 v3
-5
or even
491