
Protective Elements
Setting Example 1 for Pr> based on secondary side values
Reverse power should trip at 3%. That means 60 kW (on primary side).
First S
n
is to be calculated:
S
n
=√3* VoltageTransformer
Sec_Line-to-Line_Rated_Voltage
* CurrentTransformer
Sec_Rated_Current
S
n
= 1,73 * 100 V * 5 A = 866,05 VA
Convert the reverse power onto the secondary side:
Pr
sec
> = Pr
Pri
> / (VT
Pri_VLL Rated
/VTS
Sec_VLL Rated
* CT
Pri Rated Current
/CT
Sec Rated Current
) = 60 kW / 4000 = 15 W
The following threshold is to be set for Pr> within the device = 15W /Sn
Pr> = 15 W / 866 VA= 0,0173 S
n
987
MCDLV4
DOK-HB-MCDLV4-2E
Summary of Contents for HighPROtec MCDLV4
Page 3: ...Order Code Order Code 3 MCDLV4 DOK HB MCDLV4 2E...
Page 47: ...Installation and Connection 47 MCDLV4 DOK HB MCDLV4 2E...
Page 164: ...Input Output and LED Settings 164 MCDLV4 DOK HB MCDLV4 2E...
Page 433: ...Parameters 433 MCDLV4 DOK HB MCDLV4 2E...
Page 457: ...Device Parameters 457 MCDLV4 DOK HB MCDLV4 2E...
Page 473: ...Blockings 473 MCDLV4 DOK HB MCDLV4 2E...
Page 988: ...Protective Elements 988 MCDLV4 DOK HB MCDLV4 2E P P Q P Q P Q Q Q P S S...
Page 989: ...Protective Elements 989 MCDLV4 DOK HB MCDLV4 2E Pr Q P Q P Qr...
Page 1023: ...Protective Elements 1023 MCDLV4 DOK HB MCDLV4 2E...