Protective Elements
V/f> - Volts/Hertz [24]
Available Elements
V/f>[1] ,V/f>[2]
This protective element of the device provides over-excitation protection for the generator and unit connected
transformers. It incorporates two elements that can be programmed to specific times and used to create traditional,
two-step over-excitation protection.
In addition, the protective elements can be programmed as inverse time elements to provide advanced protection
by approximating closely the combined generator/unit transformer over-excitation curve. Standard inverse time
curves can be selected along with a linear reset rate that may be programmed to match the specific machine
cooling characteristics.
The percent pickup is based on the Nominal Voltage and Frequency settings. The V/Hz function provides reliable
measurements of V/Hz up to 200% for a frequency range of 5 - 70 Hz.
Characteristic / Curve Shape: INV A
761
MCDLV4
DOK-HB-MCDLV4-2E
1
1.2
1.4
1.6
1.8
2
0.01
0.1
1
10
100
1000
10
3
1
0.3
0.1
Ti
m
e
To
T
rip
[s
]
Multiples of volts per hertz pickup
t-m
ul
tip
lie
r
t =
t-multiplier
-1
2
( )
V / Vn
V/f>
f / fN
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...
