254 E% K_ALF_N. % 1210 I-Diff> setting 253 CT Error % system error % used for both caulculation 205 CT ratio primary value *Pickup vaule method 1 *Pickup vaule method 2 **Pickup in case of note 2 Pickup value primary
10 0.4 3 0 1200 0.4124 0.4124 0.460 494.8
1 2 10 253 253 251 254
41 % 41 % 46 % A
*restrain value
0.412
41
%
**restrain in case of note 2
0.441
44
%
I-Diff> setting CT error local % CT error Remote % K_ALF/K_ALF_N. % E% K_ALF_N. % Injected Remote current Injected Local current *Pickup vaule will be **Pickup in case of note 2 *restrain value
**restrain in case of note 2
0.2 3 3 1 10 0.5 0.5 0.7371 0.8333
A % % % % A A 74 % 83 %
0.230
23 %
0.300
30 %
SETTING OPERATING RESULT RESTRAIN RESULT ENTER BY USER Eng.Mohamed Ibrahim AT&C
* Note 1: The pickup characteristic of the differential protection
* Note 1: The pickup characteristic of the differential protection derives from the restraining characteristic Idiff = Irest (45°-curve), that is cut below the setting value I-DIFF>. It complies with the formula Irest = I-DIFF> + (errors by CT´s and other measuring errors) If the calculated differential current exceeds the pickup limit and the greatest possible measurement error
4202 K factor 4203 TIME CONSTANT 4204 alarm% I fault injected
internal culculation
1.1 1
min
A
1
A
I inject prefault
0.5
A
T alarm minute
0.2533
min.
T alarm second
15.196
Sec.
T trip minute
0.296
min.
T trip / second
17.74
Sec.
Note
3.30579
x2
0.20661
0.9 2
206 I nominal
x1
: To test we use two stages 1st prefault for 5 min. 2nd stage injected current
Calculating the overtemperature The thermal replica is calculated individually for each phase. Address 4206 CALC. METHOD decides whether the highest of the three calculated temperatures ( max) or their arithmetic average (Average ) or the temperature calculated from the phase with maximum current ( from Imax) should be decisive for the thermal alarm and tripping stage. Since an overload usually occurs in a balanced way, this setting is of minor importance. If unbalanced overloads are to be expected, however, these options lead to different results. Averaging should only be used if a rapid thermal equilibrium is possible in the protected object, e.g. with belted cables. If the three phases are, however, more or less thermally isolated (e.g. single conductor cables or overhead lines), one of the maximum settings should be chosen at any rate.
SETTING
SETTING TRIP RESULT ALARM RESULT 2642 T IP Time Dial 2640 IP> pickup I injected 2660 INVERSE 2660 very inverse 2660 Extremely inverse 2660 long time inverse
0.2
Sec
2
A
5
A
1.5139
Sec.
1.8000
Sec.
3.0476
Sec.
16.0000
Sec.
nverse Time Test: 1. Formula for IEC curve address (2660) when selec normal inverse curve: I p > = 0.5A, I o > = 0.5A T = 0.14TP / {( I/IP )0.02 ± 1} seconds 2. For IEC curve add (2660) is very inverse curve: I p > = 0.5A, I o > = 0.5A T = 13.5 TP / {( I/IP ) ± 1} seconds
2656 T 3I0P Time Dial 2650 3I0P> pickup
0.2
Sec
2
A
3. For IEC curve add (2660) is extremely curve:
2642 T IP Time Dial 2640 IP> pickup I injected 2660 INVERSE 2660 very inverse 2660 Extremely inverse 2660 long time inverse
0.2
Sec
2
A
5
A
1.5139
Sec.
1.8000
Sec.
3.0476
Sec.
16.0000
Sec.
nverse Time Test: 1. Formula for IEC curve address (2660) when selec normal inverse curve: I p > = 0.5A, I o > = 0.5A T = 0.14TP / {( I/IP )0.02 ± 1} seconds 2. For IEC curve add (2660) is very inverse curve: I p > = 0.5A, I o > = 0.5A T = 13.5 TP / {( I/IP ) ± 1} seconds
2656 T 3I0P Time Dial 2650 3I0P> pickup I injected 2660 INVERSE 2660 very inverse 2660 Extremely inverse 2660 long time inverse
0.2
Sec
2
A
5
A
1.5139
Sec.
1.8000
Sec.
3.0476
Sec.
16.0000
Sec.
3. For IEC curve add (2660) is extremely curve: I p > = 0.5A, I o > = 0.5A T = 80 TP / {( I/IP )2 ± 1} Seconds 4. For IEC curve add (2660) is long inverse: I p > = 0.5A, I o > = 0.5A T = 120TP / {( I/IP ) ± 1} (SEC) where T: Trip Time TP: Setting Value Time Multplier IP : Setting Value Current I: Injected Current
SETTING OPERATING RESULT
SETTING OPERATING RESULT
Fault locator SIEMENS
Fault
1111 Line length
100
Km
1110 Reactance per Km
0.46
ohm/Km
length
reactance
100
46
Total line
locator The measurement important supplem Availability of the line for powe be increased when
