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2.32.5 Preparation and consideration of setting
User should set line impedance for the FL; and these setting points are provided in each
Line_element. User should note that the value of the line impedance is represented as
secondary circuit of VCT.
(i) Setting in each Line_element when three-terminal being applied
As shown in Figure 2.32-8 and Table 2.32-4, when three IEDs are configured at a local-terminal
and the other remote-terminals, the protection sections are divided into three: (1) Local (Line
GJ), (2) Sec. 1 (Line JH), and (3) Sec. 2 (Line JS).
User should set impedance values into Line1_Element when the Local (GJ) is subject to
setting. As for the Sec.1 (JH), user should set impedance values into Line2_Element. Likewise,
as for the Sec. 2 (JS), set impedance values into Line3_Element.
2
User should notice that the section configurations are decided by the IED communication
port
1
; and the section is established when the communication between the IEDs is made. For
example, the Sec.1 is decided by the communication port #1 with which the Local IED (IED G)
is connected to the remote-IED (IED H). On the other hand, the Sec. 2 is decided by the
communication port #2 with which the Local IED is connected to the remote-IED (IED S).
1
Note: The configuration for the communication port is discussed separately. (See
Chapter
Relay application: Transmission control function
)
2
Note: The “Line1_Element”, “Line2_Element”, and “Line3_Element” are discussed in
the setting procedure. See section 2.32.6(iii).
(ii) Setting in Line1_Element when two-terminal being applied
The setting items in “Line1_Element” are only used when two IEDs are configured.
(iii) Setting for a signle IED configulation
The setting items in “Line1_Element” are only used when a single IED is configured. In this
case, the FL calculation with data at a local-terminal only is only applicable.
(iv) Computation of impedance when variation being found in respective
phases
When variation of the impedance in respective phases is found, user should get an impedance
in positive-sequence by Equation (2.32-26), an impedance in zero-sequence by Equation
(2.32-27), and a mutual impedance in zero-sequence by Equation (2.32-28).
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