What is a TCC drawing?
Within the Device tab for TCC drawings, the Isc Amps field indicates the total fault current on the connected bus. In terms of TCC drawings, this value determines the maximum current where the device’s curve will be cut off. There are three ways to show the maximum available fault current seen by a protective device.
What is SKM captor?
CAPTOR produces time versus current coordination drawings with one-line diagrams and setting reports. It lets you coordinate protective devices with interactive on-screen graphics, and provides a comprehensive library. You can print on preprinted graph paper or on plain paper with custom grids and layouts.
How do you rotate SKM?
Use the One-Line>Symbol Rotation>Rotate Right 90 Degrees function as shown in Fig.
What is TCC clipping current?
The ‘TCC Clipping Current’ indicates the maximum fault level for the protective device selected. It is shown on the TCC plot as a vertical arrow pointing upwards. The arrow “clips” the device characteristic curves as shown in figures 12 and 13.
How do I add a device to SKM library?
Once you have selected a device for editing, a set of tab pages containing the device’s data will appear. To add a new protective device: Choose New from the Device pull-down menu. A new device window will open automatically in which you can start adding library data.
How do you read a TCC?
TCC Item Identification The light blue curve is a switchgear feeder circuit breaker curve. The violet curve is the switchgear main circuit breaker curve. The red curve is the transformer primary fuse curve. The orange curve is the transformer damage curve.
What is a 50 51 relay?
50/51 and 50/51N relays. Overcurrent relays are the most commonly-used protective relay type. Time-overcurrent relays are available with various timing characteristics to coordinate with other protective devices and to protect specific equipment.
How do I update SKM software?
Run AlaUser_Network.exe and click on “Update from SKM Server”. Note: If . NET 4.0 is not installed, run dotNetFx40_Full_x86_x64.exe first. If there are any issues with the key update process, please contact SKM Support at [email protected] with your serial number.
How do I update SKM library?
- Go to the location of your V6.0 library (should be C:\PTW32_V6\lib\Ptw.lib)
- Copy this file from this location and paste it into your V6.5 PTW32 folder.
- Rename the library to Ptw_V6.lib.
- Open V6.
- Open the project you want to update.
- Once the project opens go to Project\Options\Library.
How do you plot TCC?
Plotting a TCC Curve from a One-Line
- Select only one item by clicking on the item.
- Select more than one item by holding down the CTRL key and selecting items individually, clicking the items that you would like to plot.
- Drag the mouse to form a box around the items you would like to plot.
How do I calculate circuit breaker time?
To determine how long a breaker will take to trip at a given current, find the level of current on the bottom of the graph. Draw a vertical line to the point where it intersects the curve. Then draw a horizontal line to the left side of the graph and find the time to trip.
What is MHO relay?
Mho relay is a voltage restrained directional relay. Important Points: Reactance relay is suitable for the protection of a short transmission line because its operation is independent of arc resistance. The relay which is selected for a long transmission line should be less affected due to power swings.