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Connection styles and polarity
5.4.4
In order that the relay can run in versatile environment, flexible operations are permitted on
the circuits of VCT; one of styles should be selected depending on the connection of CT/VT and
polarity. A style is determined by the required connection, which is equal to the actual wiring.
Figure 5.4-5 shows menus on the LCD screens about the styles and CT priorities settings.
AC Analog Input
10:48
AI#1
APPL-VCT
Setting of APPL-VCT (FEP_COMMON_MV: Function ID: 7F0081)
Setting items
Conn-CT
2P_Type
Conn-IeCT
Connection
Conn-IseCT
setting
Conn-VT
Conn-VeVT
Conn-VsVT
Pol-CT
Polarity
Pol-IeCT
setting
Pol-IseCT
Note: Term 'N/A' represents 'Not applicable' herein.
CT connection style
5.4.5
Cable connections can depend on the CT arrangements and their wirings; hence, the
connection styles are provided for actual user environments. Several CT connection styles are
provided (No. 101–122) in order that the CT can get three-phase current, zero-sequence phase
current and residual current.
APPL-VCT
1/2
10:48
>
Conn-CT
>
2P
Conn-IeCT
Residual
Conn-Ise
Use
Conn-VeVT
Use
Conn-VsVT
Use
Polarity Change >
Figure 5.4-5 Instruction of CT connection settings
Table 5.4-1 Style and polarity settings for CT and VT
Range
No use / 3P / 2P
1 / 2
No use / Residual /
Independent
No use / Use
No use / 3PN / 3PP /
2PP / 1PN / 1PP
No use / Use
No use / Use
Negative / Positive
Negative / Positive
Negative / Positive
1/7
+
Setting for
'Connection style'
+
+
+
+
Setting for
'Polarity '
Switch contents
Units
–
CT connection style
–
Switch for setting [Conn-CT]=2P
–
IeCT connection style
–
IseCT connection style
–
VT connection style
–
VeVT connection style
–
VsVT connection style
–
Polarity at CT
–
Polarity at IeCT
–
Polarity at IseCT
- 632 -
6F2T0207 (0.01)
Conn-CT
10:48
1/1
2P_Type
+
1
Polarity Change
10:48
1/3
Pol_CT
+
Positive
Pol_IeCT
Positive
Pol_IseCT
Positive
Model GRE200-
5
3P
1
Residual
(N/A)
(N/A)
Use
3PN
Use
Use
Positive
Positive
(N/A)
(N/A)
Positive
GRE200 (5,6)
6
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