If a common circuit breaker protection is provided for several lines (as shown in the figure), in the panel corresponding to the protection, the checks are displayed with all the cables that are further down the line (in the example, the checks of the common protection are also listed with the three cables that follow it).
Once the load flow analysis has been completed, the “Checks” button , contained in the “Load flow” block of the top toolbar, provides users with a list of the elements that fail in the installation.
A column has been added to this Checks panel, for each element, where users can open and edit the element in question and solve the situation that causes the element to fail in a quick and accessible manner.
Once the element is edited using this method, its row will be displayed in red and the panel will then indicated that a new analysis has to be launched to update the results.
In the “Settings” option of the “Load flow” section of the toolbar, users can now select the loadcases which are to be analysed. This selection affects the analysis process of the loadcase in such a way that only the properties and results of the loadcases selected in this section will be referred to.
The definitions of status loadcases were included in the 2018.c version of CYPELEC Networks.
Now, in the 2018.e version, a powerful tool has been introduced to analyse all the loadcases that have been defined, which allows users to view the results of all the loadcases quickly and clearly. This tool allows users to obtain a global view of the results provided by the load flow analysis for all loadcases and aids them to adopt solutions to comply with the corresponding loadcases.
This tool is selected by pressing the “Loadcase analysis” button located in the “Load flow” section of the toolbar, which opens a panel containing the loadcases that have been defined and their corresponding analysis results, all of which is organised in several tabs:
- Information tab
Shown in this tab are the design properties of the loadcases selected on the left, such as the number of buses, branches, generators, supplies and loads each loadcase consists of. The initial reference bus for the analysis of the load flow calculation is also specified as well as the resultant generation power.
- Buses tab
The resultant voltage values in PU in each bus for each loadcase are transferred here and are compared with the allowable accumulated voltage drop values that have been defined in General settings.
- Cables tab
The “Cables” tab is sub-divided into 4 sections:
Shows the resultant design current that flows through each cable or transmission line, and is compared with its ampacity.
Maximum voltage drop
Shows the resultant voltage drop due to the impedance and admittance of the cable or transmission line, and is compared with the maximum voltage drop that has been introduced in the Edit panel.
Maximum error between the nominal voltage and operating voltage (%)
Shows the percentage resultant error between the nominal voltage and operating voltage, and it is compared with the value that is introduced in the Edit panel of the cable or transmission line.
Maximum imbalance between phases (%)
Shows the percentage resultant imbalance between the most loaded phase and the least loaded, and is compared with the maximum imbalance value between phases that has been introduced in the Edit panel of the cable or transmission line.
- Loads tab
Here, represented for each loadcase, are the values of the active and reactive power of the loads, which are affected by the use and simultaneity criteria specified for each loadcase.
- Supplies tab
The resultant values of the active and reactive power generated by each supply are displayed for each loadcase, in accordance with the load flow calculation.
- Protection tab
Also for each loadcase, represented in this tab is the check that relates the nominal or protection regulating current, with the design current of the line and ampacity of the cable it protects.
Allowable current tables of the IEC 60364-5-52 have been added to the list of tables described in the NEC to be used in the ampacity calculation of ANSI cables.
This way, depending on the chosen reference installation method and the properties of the selected cable, the program will provide the allowable current of IEC conductors. This improvement allows users to use the program for European installation and for countries that use square millimetre sections.
The program includes Prysmian cables in its library, so users have cable families of both standards (ANSI and IEC) available.
The 2018.d version of CYPELEC Networks includes substantial improvements in the window that displays the status loadcases:
- The information is displayed as a table
- Its speed has been increased
- As well as being able to view the state conditions of fuses, switches, contacts and operating regimes of generators and motors, the diversity conditions of buses and use of loads are included.
- To manage the important amount of information due to a large number of loadcases and elements, a filter tool has been added to the window to select the equipment or element category to be viewed.
The 2018.d version includes the option to define use factors for loads.
Use factors for loads are applied to each load independently and affect the calculation of the flow of the loads of the installation.
Loads can also be defined as a “spare load”, which are not considered in the calculation of the load flow.