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Fused Switch Data

This dialog box includes the following areas and tabs:

Figure 1: Fused Switch Data Dialog Box

Connection Information

Option Description
ID Name Uniquely identifies the fused switch. This ID name can be up to 16 characters long. The names default to FS-1, FS-2, FS-3... as you enter new fused switches on the one-line, but you can change the ID name to be more descriptive if needed.
Open

Normal state of the fused switch. If selected, the one-line displays “OPEN” next to the fused switch symbol.

Closed If selected, the one-line does not display “OPEN” next to the fused switch symbol.
On Bus The bus connected to the fuse switch, which must already exist on the one-line.
Base kV The kV of the bus to which the fuse switch is connected. The options available in the Specifications tab and Short Circuit tab depend on the bus voltage. Either LV or HV fused switches can be selected from this dialog box. Although the EasyPower Device Library has HV and LV Fused Switches as separate devices, the same dialog box is used to select both types.
Connection Type Whether the fused switch is connected as a “Feeder,” (to a cable, busway, or transformer, for example.) or as a “Tie” (between two buses).
Lock Auto-Sizing When this check box is selected, the fused switch cannot be auto-sized.
Lock Auto-Coordination When selected, auto-coordination is not available.

Specifications

Option Description
Mfr Provides a list of fused switch manufacturers available in the device library. If the desired manufacturer is not listed in the device library, you can add it to the library.
Type Fused switch types available from the manufacturer chosen in the Mfr field above. If the desired type is not listed, you can add it to the library.
Style Fused switch styles available from the type chosen in the Type field above. If the desired style is not listed, you can add it to the library.
Find Style Enables you to search the library for a fuse style.
One-line Graphics

Select the symbol that appears on the one-line diagram.

  • Fused Switch: Default setting that will show a fused switch symbol on the one-line diagram.
  • Fused Contactor: A fused contactor symbol will show on the one-line diagram.
  • Fuse Only: Shows fuse only in the fuse symbol (without either contactor or switch).
Plot Phase TCC Select this check box to plot the TCC for the fused switch. If the check box is not selected, the TCC for the device is not plotted.
Model This field enables you to view available models of the fuse style that you have chosen and to select a specific model.
Library kV Choose the section of the library the fuse data is entered. In most cases, the selected Library kV is approximately the base kV of the fuse. For LV fuses, this field is blank.
Size This field enables you to view available sizes of the fuse model that you have selected and select a specific size.
View Notes Click to view notes about the fused switch. You must first select a manufacturer, type, and style. The notes come from the device library.
One-line Data Text

Use to select text to appear on one-line diagram. For text to appear next to symbols on the one-line diagram, choose Tools > Options > Text Visibility and select the check box for Fused Switch.

  • Automatic (Based on ‘Size”): When selected, fuse size appears next to the fused switch on the one-line diagram.
  • User Specified Field: When selected, you can enter text information that appears on the one-line.

Short Circuit

Figure 2: Fused Switch Short Circuit Dialog Box

Option Description
Ratings
Fused Interrupting (kA) The interrupting rating of the fused switch.
Test X/R Test X/R ratio of the circuit. ANSI Standard test ratios might be different for the same fuse depending on the voltage level at which the fuse is applied.
Testing Standard This comes directly from the device library and cannot be changed.
Calculate Fills in computed values for the Test X/R and Fused Interrupting fields, based on the device library entry for Mfr, Type, Style, and the base kV. You can override these values by typing in different numbers. This button also causes the appropriate Testing Standard to be displayed for your information.

TCC Defaults

Data entered in this section is used to place tick marks representing short circuit values on the TCC plot.
TCC Clipping You can clip the time current curve (TCC) for the breaker at the specified current in kA for Momentary (1/2 cycle), 5-cycle or 30-cycle. Select <None> to avoid clipping of TCC.
SC Tick Marks Select the appropriate check boxes to display the tick mark on the TCC plot. You can display Momentary, Interrupting and 30 Cycle short circuit values. Enter the corresponding short circuit values in kiloamps in their respective edit fields for phase short circuit.
Default Phase SC Values The short circuit values entered in kA in these fields can be displayed for phase currents on TCC plots.

Switch

Figure 3: Switch Tab

Option Description
Mfr Provides a list of switch manufacturers available in the device library. If the desired manufacturer is not listed in the device library, you can add it to the library.
Type Switch types available from the manufacturer chosen in the Mfr field above. If the desired type is not listed, you can add it to the library.
Style Switch styles available from the type chosen in the Type field above. If the desired style is not listed, you can add it to the library.
Cont. Current (A) Continuous current rating of the switch.
Momentary / C&L (kA) Momentary or Close and Latch rating of the switch.
Calculate Fills in device ratings based on library entries for the specified switch.

Mtr O/L (Motor Overload)

Figure 4: Fused Switch Mtr O/L Dialog Box

Option Description
Plot Motor Overload Relay TCC To plot the TCC of an attached motor overload relay with the fused switch TCC, select this check box. If you do not select this check box, then no TCC is plotted for an attached motor overload relay.
Motor Overload Relay

Specify the motor overload relay associated with the breaker in protecting the motor.

  • Mfr: Provides a list of motor overload relay manufacturers available in the device library. If the desired manufacturer is not listed, you can add it to the library.
  • Type: Provides a list of motor overload relay types available from the manufacturer chosen above. A type would include a group of models or brands with similar functions. If the desired type is not listed, you can add it to the library.
  • Style: Provides a list of motor overload relay styles available from the type chosen above. Styles are essentially models. If the desired style is not listed, you can add it to the library.
Motor Parameters

Determines the pickup level for the motor overload relay.

Full Load Amps (FLA): The full load amps specified for the motor, or the relay rating.

Service Factor: Overload factor of the rated amps. This factor does not increase the rating but simply increases the pickup level. You may enter any value between 1.0 and 1.25.

Harmonics

Figure 5: Harmonics Tab

Option Description
Monitor IEEE 519 Point of Common Coupling

EasyPower can monitor whether or not the IEEE 519 guideline for harmonics is met at the point of common coupling.

If selected, then the Harmonics Report indicates when this guideline is not being met.
kVA Demand The kVA Demand.
PCC Isc/Load The ratio of short circuit current to load current at the point of common coupling.

Stability

Figure 6: Fused Switch - Stability Tab

Option Description
Enable Contactor Model Enables stability data.
Mfr Provides a list of contactor manufacturers available in the device library. If the desired manufacturer is not listed in the device library, you can add it to the library.
Type Contactor types available from the manufacturer chosen in the Mfr field above. If the desired type is not listed, you can add it to the library.
Model Lists available contactor models in the library.
Lib Populates contactor data from the library.

Imported Data

This tab is read-only and appears only if you have imported data from an SKM Data Format file. See Importing an SKM Format File for more information.

Comments

See Comments for information.

Hyperlinks

See Hyperlinks for information.

More Information

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Help was last updated on 2/8/2016