Areva p343 (Oc,Nps,Thermal.cal With Formula)

OVER CURRENT IDMT

Time / current current characteri characteristics stics

I> = I (A) = k= t (s (s) =

Values 0.8 1.6 A 0.4

Note:: Accordin Note According g to the the standa standard rd B Set current value Current value Time multiplier  

Operating titime in in se seconds

Normal inverse

Very inverse

t (s)=

4.011611 s

t (s)=

I> = t (s) = k=

Values 1.25 100 sec 0.5

I (A) =

5.4 s

1.294509 A

t (s)=

Note:: Accordin Note According g to the the standa standard rd B Set current value Operating time in seconds Time multiplier

Current value in ampere

Normal inverse I (A) =

Extremely

Very inverse I (A) =

1.334375 A

Type Normal inv Very invers Extremely i Long-time i

Extremely I (A) =

FIELDS IN BLUE ARE NECESSARY TO FILL IN

OVER CURRENT IDMT BASIC

Sida 1

OVER CURRENT IDMT

Sida 2

OVER CURRENT IDMT

Sida 3

OVER CURRENT IDMT

S 142.1966 the normal current range is defined as 2..20 times the current.

I (A) / I> =

2

 inverse

Long-time inverse

10.66667 s

t (s)=

48 s

S 142.1966 the normal current range is defined as 2..20 times the current.

 

rse e   nverse   nverse

I (A) / I> 1.035607 1.0675 1.183216 1.6

 inverse 1.47902 A

 

Long-time inverse I (A) =

2 A

FORMULA

Sida 4

OVER CURRENT IDMT

Sida 5

OVER CURRENT IDMT

Sida 6

OVER CURRENT IDMT

Sida 7

OVER CURRENT IDMT

Sida 8

MICOM RELAY NEGATIVE PH SEQ P343 TRIP TIME CALCULATIONS INJECTED I2 FROM RELAY I2 SET CURRENT K2 TRIP TIME ( T)

1 0.24 10.5 10.81454 Sec 182.2917 0.9424 -0.05933

NPS THERMAL OPERATING TIME

Setting Itheta > Ke Te1 Te2 In

Relay Thermal Settings Range Value 0.2 to 1.5In 1.00 0 to 10 3 1 to 180min 1 1 to 360min 1 1A or 5A 1

Additional Values for Curve Plot Settings Range Value Initial State 0 to 100% 0% %age Neg Seq 0 to 100% 0% %age Pos Seq 100%  Ambient Temp -40 to 100deg 25 Only enter values in the yellow boxes. All other cells simply calculate the necessary values to plot the curves.

 Ambient Correction

Ieq 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.6 1.7 1.8 1.9 2 2 3 4 5 6 7 8 9 10

=>

K 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.6 1.7 1.8 1.9 2 2 3 4 5 6 7 8 9 10

1

Pos Seq Current 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.6 1.7 1.8 1.9 2 2 3 4 5 6 7 8 9 10

Neg Seq Current Numerator Denominator 0 1.1025 0.1025 0 1.21 0.21 0 1.3225 0.3225 0 1.44 0.44 0 1.5625 0.5625 0 1.69 0.69 0 1.8225 0.8225 0 1.96 0.96 0 2.1025 1.1025 0 2.25 1.25 0 2.56 1.56 0 2.89 1.89 0 3.24 2.24 0 3.61 2.61 0 4 3 0 4 3 0 9 8 0 16 15 0 25 24 0 36 35 0 49 48 0 64 63 0 81 80 0 100 99

Calc1 10.7561 5.761905 4.100775 3.272727 2.777778 2.449275 2.215805 2.041667 1.907029 1.8 1.641026 1.529101 1.446429 1.383142 1.333333 1.333333 1.125 1.066667 1.041667 1.028571 1.020833 1.015873 1.0125 1.010101

Trip Time 142.5284 105.0761 84.67056 71.13742 61.29907 53.74753 47.73696 42.82599 38.73281 35.2672 29.71929 25.48078 22.14585 19.46145 17.26092 17.26092 7.066982 3.872311 2.44932 1.690253 1.237157 0.944901 0.745351 0.60302

THERMAL OVER LOAD OPERTING TLME