To increase/decrease a voltage reading by y percent, multiply the gain factor by (100 + y)/100.

Change by

y

Multiply by

Increase 2%

+2

102/100 = 1.02

Decrease 5%

-5

95/100 = 0.95

Current Gain Factors: 4-byte signed LSB values with 16 bits of fraction that are used as a divisive factor.

As Stored (LSB)

MSB

Decimal

Scaled

Meaning

0x000000100

0x000010000

65536

1.00000

x/1.00 (unity)

0x0711C0100

0x00000E8BA

59578

0.90909

x/0.90909 (magnification 10%)

0x0711C0100

0x000011C71

72817

1.11110

x/1.11110 (diminution 10%)

To increase/decrease a current reading by y percent, multiply the gain factor by 100 (100 + y).

Change by

y

Multiply by

Increase 2%

+2

100/102 = 0.98039

Decrease 5%

-5

100/95 = 1.05263

Phase Compensation Factors: 2 -byte signed LSB values in units of 0.01” of additive Power Factor shift.

As Stored (LSB)

MSB

Decimal

Scaled

Meaning

0x00000

0x00000

0

0.00

No Phase Shift

0x00200

0x00002

2

0.02

+0.020 PF Shift

0x0FEFF

0x0FFFE

-2

-0.02

-0.020PF Shift

To increase/decrease power at 600 in Quadrant 1 by y percent, modify the Phse Compensation by

60

0

− cos

−1

50

 

 

 

 

 

 

 

 

 

 

100 + y

Change by

y

 

 

Modified by

 

Increase 2%

+2

600-cos-1

(50/102) = 600-cos-1

(0.49020)

= 600-60.650

= -0.650

Decrease 5%

-2

600-cos-1

(50/95) = 600-cos-1

(0.52632)

=600-58.240

= +1.760

5-18

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Image 282
GE EPM 9650/9800 manual Change by Multiply by, Decimal Scaled Meaning, Change by Modified by