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4.2 Differential Protection

435

7UT613/63x Manual

C53000-G1176-C160-2

4.2 Differential Protection

Pickup Values

Time Delays

Figure 4-1 Tripping characteristic of the differential protection

diff

differential current = |I

+ I

rest

stabilising current = |I

| + |I

NObj

Nominal current of protected object

Differential current I

Diff

>/I

NObj

0.05 to 2.00 Steps 0.01

High-current stage I

Diff

>>/I

NObj

0.5 to 35.0

or ∞ (ineffective)

Steps 0.1

Increase of the pickup value when connect-

ing as a factor of I

Diff

1.0 to 2.0 Steps 0.1

Add-on restraint on external fault

stab

> setting value)

Action time

Add-on

NObj

2.00 to 15.00

2 to 250 cycles

or ∞ (active until dropout)

Steps 0.01

Increments 1 cycle

Trip characteristic see Figure 4-1

Tolerances (with preset characteristic parameters, for 2 sides with 1 measuring location each)

Diff

> stage and characteristic 5 % of set value

Diff

>> stage 5 % of set value

Delay of I

Diff

> stage T

IDiff>

0.00 s to 60.00 s

or ∞ (no trip)

Steps 0.01 s

Delay of I

Diff

>> stage T

IDiff>>

0.00 s to 60.00 s

or ∞ (no trip)

Steps 0.01 s

Time tolerance 1 % of set value or 10 ms

The set times are pure delay times

Brand	Siemens
Model	SIPROTEC 7UT63 series
Category	Protection Device
Language	English

Siemens SIPROTEC 7UT63 series User Manual

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