Setting Guidelines - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
9.15.3
Transformer protection RET670 2.2 ANSI
Application manual
1. Short circuit protection for SCB and connecting leads (can be provided by using
PHPIOC, OC4PTOC, CVGAPC, T2WPDIF/T3WPDIF or HZPDIF functions)
2. Ground-fault protection for SCB and connecting leads (can be provided by using
EFPIOC, EF4PTOC, CVGAPC, T2WPDIF/T3WPDIF or HZPDIF functions)
3. Current or Voltage based unbalance protection for SCB (can be provided by using
EF4PTOC, OC4PTOC, CVGAPC or VDCPTOV functions)
4. Overload protection for SCB
5. Undercurrent protection for SCB
6. Reconnection inhibit protection for SCB
7. Restrike condition detection
CBPGAPC function can be used to provide the last four types of protection mentioned
in the above list.

Setting guidelines

This setting example will be done for application as shown in figure 291:
400kV
500/1
200MVAr
400kV
IEC09000754 V1 EN-US
Figure 291: Single line diagram for the application example
From figure 291 it is possible to calculate the following rated fundamental frequency
current for this SCB:
Current protection
GUID-CECD6525-779C-4A77-844D-031AAEE3A5B6 v1
GUID-7C456976-BA0D-4AAC-9C7A-F73AF52B2B44 v2
Preprocessing Capacitor bank
Function Block protection function
SMAI
Section 9
CBPGAPC
IED
IEC09000754-1-en.vsd
597