ARABIA ELECTRIC LTD. Equipment

Longitudinal Differential Protection Relay Type 7SD522 (-F87L)FINAL SETTINGS

Contract No. : 20531092/00

Bay/Feeder : = C03+R11, DIA-3

HVE OHL (AC-10) Relay Type : 7SD5221-4AB29-2CL5/FF

Substation : 380 KV IWPP S/S Serial No. :BF0702087442IN = 1 A fN = 60 HZ UH = 110 DC

1. Measurements:

C.T Ratio: 2500/1

Phases Injected current MeasurementValues

Secondary Primary Id % Is %L1E 0.25

See attached Relay Print Out (2-Sheets)L2E 0.5L3E 0.753I0 -

1- Differential Protection

2. I –DIFF > (add: 1210):

Setting L1-E L2-E L3-E

Pick up current (A) 0.2 0.212 0.213 0.216

Drop off current (A) - 0.102 0.108 0.106

Time (m. sec) 0 29.6 27.8 29

Note: For determining pick up and drop off current the injection is done gradually.

DATE: 19.04.2009

SIEMENSSEC

NAME EHAB USSAMA M. SURRATI

SIGNATURE

PTD SE 07/2005 Page 1 of 3 SIEMENS Ltd. Saudi Arabia Arabia Electric Ltd (E)

ARABIA ELECTRIC LTD. Equipment

Longitudinal Differential Protection Relay Type 7SD522 (-F87L)FINAL SETTINGS

Contract No. : 20531092/00

Bay/Feeder : = C03+R11, DIA-3

HVE OHL (AC-10) Relay Type : 7SD5221-4AB29-2CL5/FF

Substation : 380 KV IWPP S/S Serial No. :BF0702087442IN = 1 A fN = 60 HZ UH = 110 DC

3. I - DIFF > value under switch on condition (add:1213 ) :

Setting = 0.25 A

Under switch on condition, the relay will operate on the setting of {I–DIFF > value under switch

on condition add (1213)} not I –DIFF > value add ( 1210 ), that is during the seal in time after

manual close add ( 1150A ) and after this time the relay will operate with its normal setting I –

DIFF > value add ( 1210 ).

So, you inject current more than 0.1 A add (1210 ) and less than 0.3A add ( 1213 ) in the same time of manual close or during the 30 sec after manual close, you will find that the relay will not trip with I –DIFF > value add ( 1210 ),until the 30 sec elapsed.But if the current was more than 0.17 A the relay will trip instantaneously by I –DIFF > value

under switch on condition add ( 1213 ).

Setting L1-E L2-E L3-E

Pick up current (A) 0.25 0.267 0.266 0.267

Drop off current (A) - 0.137 0.136 0.138

Time (msec) 0 28.1 26.3 30.6

DATE: 19.04.2009

SIEMENSSEC

NAME EHAB USSAMA M. SURRATI

SIGNATURE

PTD SE 07/2005 Page 2 of 3 SIEMENS Ltd. Saudi Arabia Arabia Electric Ltd (E)

ARABIA ELECTRIC LTD. Equipment

Longitudinal Differential Protection Relay Type 7SD522 (-F87L)FINAL SETTINGS

Contract No. : 20531092/00

Bay/Feeder : = C03+R11, DIA-3

HVE OHL (AC-10) Relay Type : 7SD5221-4AB29-2CL5/FF

Substation : 380 KV IWPP S/S Serial No. :BF0702087442IN = 1 A fN = 60 HZ UH = 110 DC

4. I –DIFF >> (add :1233) :

Raise the setting of I –DIFF > add ( 1210 ) and I –DIFF > value under switch on condition

add ( 1213 ) above setting of I –DIFF >> add ( 1233 ).

Settings L1-E L2-E L3-E

Pick up current (A) 1.7 1.66 1.67 1.67

Time (m. sec) 0 15 13 17

5. 2nd HARMONIC TEST:

Id> SetInjected

(A)SETTING

HARMONICSL1 L2 L3

200mA 1 15% = 0.15A 0.18 0.18 0.18

DATE: 19.04.2009

SIEMENSSEC

NAME EHAB USSAMA M. SURRATI

SIGNATURE

PTD SE 07/2005 Page 3 of 3 SIEMENS Ltd. Saudi Arabia Arabia Electric Ltd (E)