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SEL 300G
Generator Protection
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  1. Open and close electrical circuits

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  2. Current overload and short circuit protection of electrical equipment.

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SEL 300G
E87 = G
Inom
Pri
sec
pri
sec
Vnom
pri
sec
Differential Calcs
Single Phase Current

\(I_{FLA}=\frac{KVA \cdot 1000}{V_{Phase}} \)

Three Phase Current

\(I_{FLA}=\frac{KVA \cdot 1000}{\sqrt{3}\cdot V_{Phase}} \)

Where:
  • \( {V_{Phase}: V_{Line-Line} , V_{Line-neutral} } \) \(\text{Phase voltage can be either Line to line or line to neutral}\)
Differential Settings
U87P
O87P
TAP 1
TAP D
SLP1
SLP2
Output Values
IRT RANGE
Element Winding 1 Winding 2
U87 Pickup
Output Values
Slope 2
Element Winding 1 Winding 2
U87 Pickup

Unrestraint Current Test

Winding 1

Winding 2

U87 Pickup
U87 Pickup

Differential Graph

Current Ratings:
Single Phase Current

\(I_{FLA}=\frac{KVA \cdot 1000}{V_{Phase}} \)

Three Phase Current

\(I_{FLA}=\frac{KVA \cdot 1000}{\sqrt{3}\cdot V_{Phase}} \)

Where:
  • \( {V_{Phase}: V_{Line-Line} , V_{Line-neutral} } \) \(\text{Phase voltage can be either Line to line or line to neutral}\)
Time Overcurrent 51

Select ANSI Relay Curve

Formula Parameters