Toshiba GR200 Series Instruction Manual page 408

and so on.
Calculation error in two-terminal-ends operation
The nominal measurement error can be with in ±1km when the following conditions are
applied:
The line length (L) is shorter than 100km.
⚫
The setting value [DIFL-I1] is lower than a half of the rated current
⚫
The differential current (Id) is larger than double of the rated current
⚫
In other words, the calculation error can be with in ±1% when the following conditions are
applied:
The line length (L) is shorter than 100km.
⚫
The setting value [DIFL-I1] setting is lower than a half of the rated current
⚫
The differential current (Id) is larger than double of the rated current
⚫
Calculation error in three-terminal-ends operation
The nominal measurement error can be with in ±2km when the following conditions are
applied:
The line length (L) is shorter than 100km.
⚫
The setting value [DIFL-I1] is larger than a quarter of the rated current
⚫
The reactance per unit length ( X1 L ⁄ ) is smaller than the value ( 0.05 I
⚫
The reactance per unit length ( X1 L ⁄ ) is lower than the value ( 6.0 I
⚫
The differential current (Id) is larger than double of the rated current
⚫
On the other hand, the calculation error can be with in ±2% when the following conditions are
applied:
The line length (L) is shorter than 100km.
⚫
The setting value [DIFL-I1] is lower than a quarter of the rated current
⚫
The reactance per unit length ( X1 L ⁄ ) is larger than the value ( 0.05 I
⚫
The reactance per unit length ( X1 L ⁄ ) is smaller than the value ( 6.0 I
⚫
The differential current (Id) is larger than double of the rated current2 (2 × I
⚫
Note: Rated current (In) is described separately. (See Chapter
2
Transformer module
)
- 385 -
6F2S1914 (0.49)
(0.5 × I ).
2
n
(2 × I ).
2
n
(0.5 × I
2
n
(2 × I ).
2
n
(0.25 × I ).
2
n
⁄ ).
n
⁄ ).
n
(2 × I ).
2
n
(0.25 × I ).
2
n
⁄ ).
n
⁄ ).
n
).
n
Technical description:
GRL200 (Soft 033 & 037)
).