- 385 -
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
2
(
).
⚫ The differential current (Id) is larger than double of the rated current
2
(
).
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
2
(
).
⚫ The differential current (Id) is larger than double of the rated current
2
(
).
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
2
(
).
⚫ The reactance per unit length (
) is smaller than the value (
).
⚫ The reactance per unit length (
) is lower than the value (
).
⚫ The differential current (Id) is larger than double of the rated current
2
(
).
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
2
(
).
⚫ The reactance per unit length (
) is larger than the value (
).
⚫ The reactance per unit length (
) is smaller than the value (
).
⚫ The differential current (Id) is larger than double of the rated current2 (
).
2
Note: Rated current (In) is described separately. (See Chapter
Technical description:
Transformer module
)
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