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<< Click to Display Table of Contents >> Navigation: Components and parameters > Switches and protections > Voltage protection |
The voltage protection trips in case there is an undervoltage or overvoltage.
The voltage protection is part of a circuit breaker.
The voltage protection characteristic can not be chosen. The characteristic always is fixed time.
Directional sensitivity of an voltage protection can be defined as:
•backward (<), directed away from the branch or element as seen from the node
•undirected (<>)
•forward (>), directed towards the branch or element as seen from the node
The directional sensitivity can be set at the level of the circuit breaker under tab General. The implementation of the directional sensitivity of the voltage protection is equal to the directional sensitivity of the current protection.
PARAMETERS
Parameter |
Default |
Unit |
Description |
Type |
|
|
Predefined type from the component database |
Short |
|
|
Short name |
Unom |
|
kV |
Nominal voltage |
t,input |
0 |
s |
Pickup time |
t,output |
0 |
s |
Operation output time |
U< |
0 |
kV |
Undervoltage (coupled voltage) for slow tripping |
t< |
0 |
s |
Undervoltage slow tripping time |
U<< |
0 |
kV |
Undervoltage (coupled voltage) for fast tripping |
t<< |
0 |
s |
Undervoltage fast tripping time |
U> |
0 |
kV |
Overvoltage (coupled voltage) for slow tripping |
t> |
0 |
s |
Overvoltage slow tripping time |
U>> |
0 |
kV |
Overvoltage (coupled voltage) for fast tripping |
t>> |
0 |
s |
Overvoltage fast tripping time |
Ue> |
0 |
kV |
Earth voltage (non-directional sensitivity) |
te> |
0 |
s |
Earth voltage tripping time |