A fuse can be placed on either side of a branch or on an element.
To add a fuse, select the branch or element and the connecting node and select: Insert | Switches and protections | Fuse.
A fuse can not occur in a field together with a circuit breaker.
A fuse that has been copied can be pasted in several places at the same time. To do this, select the relevant feeders (a feeder is defined as a branch or element with the connecting node) and choose Start | Clipboard | Paste special | Paste load switch in all selected feeders.
A fuse in the primary side of a transformer also shows two points representing the inrush current and time: 12*Trafo.Inom at 0.1 s and 25*Trafo.Inom at 0.01 s.
In addition to the current-time diagram of a fuse, it is also possible to see the curves of other selected fuses and/or current protection devices in the same graph. To do this, click with right in the graph and choose Show all selected current protections or Idem, at this voltage.
PARAMETERS
General
Parameter |
Default |
Unit |
Description |
Name |
|
|
Fuse name. |
Fuse
The fuse is described by its current-time diagram, with the following parameters:
Parameter |
Default |
Unit |
Description |
Type |
|
|
Predefined type from the component database |
Short |
|
|
Short name. Maximum 10 characters. |
Unom |
1) |
kV |
Nominal voltage |
Inom |
0 |
A |
Nominal current |
Switches three phases |
no |
yes/no |
Designation that the fuse switches three phases simultaneously |
I1 ... I16 |
0 |
A |
16 possible current values for the current-time diagram |
t1 ... t16 |
0 |
s |
16 possible time values for the current-time diagram |
Type
All fuses with a Unom of 80% to 150% of the Unom of the node are listed.
MODELLING
Curve
A general fuse characteristic is given below.
Each fuse has its own characteristic curve. The data describing the curve can be found in the manufacturer's data sheets.
Reliability
The fuse is infinitely reliable. This means that the fuse is no source of an active failure. A short circuit current will always be switched off.