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CHAPTER 5: SETTINGS GROUPED ELEMENTS

L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-241

Figure 5-126: Ground distance zone 1 OP scheme

Figure 5-127: Ground distance zone 2 OP scheme

For ground distance zone 2, there is a provision to start the zone timer with the other distance zones or loop pickup

flags to avoid prolonging ground distance zone 2 operation if the fault evolves from one type to another or

migrates from zone 3 or 4 to zone 2. Assign the required zones in the trip output element to accomplish this

functionality.

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GE L90 Specifications

General