Tutorials 360 en [PDF]

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Quick Tutorials

Quick Tutorials Introduction To get started with NEPLAN in a quick and easy way, we recommend you to follow these quick tutorials. The basic calculation modules will be explained by examples. First you will learn how to start a new project and how to build a small power system model. That means, how to enter the elements graphically, how to enter data, how to use libraries, how to run calculations and how to present the results in a manner adapted to the objectives of the analysis. As mentioned, these Tutorials are the first step to get used to the NEPLAN software. For details about models of elements, data input or calculation inputs, please consult the respective chapters of the User's Guide. For a complete software training based on your needs please don’t hesitate to contact us.

Basics To understand the NEPLAN environment, it is essential that certain concepts used in the system are described:

Fig. 1-Tutorials. One line diagram with network components

An electrical power system consists of nodes and elements.

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Nodes description A node (or busbar) is the connection point of two elements or a location, where electrical energy will be produced or consumed (generator, load). A node is described by its • name, • nominal system voltage in kV, • zone and area, • type of node (main bus bar, bus bar, sleeve, special node), • description, alias name 1 and 2 The nominal system voltage Un is the line-to-line voltage, for which a power system is designated and on which several characteristics of the power system have been referred. In NEPLAN the nominal system voltage of the nodes must be entered during the node data input. Every voltage is given as a line-to-line voltage (delta voltage). It is not necessary to past a node in between all elements. They may also be connected directly with a link. In this case no node results will be presented and not more than two elements can be connected together in the same point.

Elements description An element corresponds to a network component, like e.g. line, transformer or electrical machine. There are active elements and passive elements. An element is described topological by a starting and an ending node. For three windings transformers a third node must be given. The elements will be described electrical by • the rated current, rated power and rated voltage and • the parameters, such as losses, reactances, etc. In NEPLAN these parameters are entered with input dialogs. The active elements are external grids, asynchronous machines, synchronous machines and power station units. The external grid represents a neighboring network. The passive elements are lines, couplings, switches, reactors, two and three windings transformers, shunts and loads. The loads can also be entered along a line without entering nodes (line loads). Modeling of Active Elements

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For a short circuit calculation the active elements are modeled with the help of their sub-transient reactance. For a load flow calculation these elements will be represented by resistive and reactive powers (PQ-nodes) or by voltage magnitude and angle (slack nodes) at the node. The external grid usually will be modeled as a slack node.

Protection Devices, Current and Voltage Transformers description Protection devices (over current relays, distance protection relays, circuit breakers) and current or voltage transformers are associated with the built-in node and the switching element. They have no influence on the load flow and short circuit calculation. Only their limits are checked during the calculation. These elements are used in the relay coordination modules.

Station description A station can contain several nodes and has no meaning for the calculations or for protection device coordination. It will only be used in relation to the database.

Symbol description For each element type there are different symbols in the Symbol Window. Choose the one you want to past in the diagram. A Symbol Library is included in the NEPLAN package, where user defined symbols may be created.

Switches description In NEPLAN the switches are used to change the network topology (switching on/off elements). There are two different types of switches: • physical switch and • logical switch. Physical switches are couplers, circuit breakers and disconnect or load switches. Logical switches are fictive switches, which are assigned to all elements by the system. A line, for example, has two logical switches, one at the starting and one at the ending node. A physical switch has no logical switch, because it will already be switchable. During the input of a network, the physical switches can be neglected, because switching can be done with the help of the logical switches. This has a disadvantage, when a line leads to a double bus bar system. Switching from one bus bar to another, the user has to change the starting or the ending node of the line. If the user enters two disconnect switches (one to each bus bar) with an addi-

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tional node in between, the switching can be done with the disconnect switches. The physical switches can be reduced during the calculation (see the Parameters dialog of the respective calculation modules).

Feeders description Feeders are defined normally in electrical distribution networks. A source node and a source element, normally a line, must be given to define a feeder. The assignment of feeder information to nodes and elements are made, based on the source node and element, automatically. Each feeder may be presented in a different color. Scaling factors for loads, generations and compensations could be assigned for feeders.

Voltage levels description Each voltage level may be presented with a different color and a minimum and maximum voltage limit for normal and n-1 situation could be defined. The nominal voltage of each node determines the voltage level that this node will belong

Partial Networks description Unlike zones and areas, a partial network is an independent network. A partial network has no connections to any other networks. You can make partial networks by opening logical or physical switches. It is possible to color each partial network differently (see below).

Fig. 2-Tutorials. Partial networks

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User Interface 2

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6 Fig. 3-Tutorials. Window features in the User Interface

The numbers indicate the following window features: 1. Title bar 5. Symbol Window 2. Menu option bar 6. Message Window 3. Toolbar Ribbons 4. Workspace

Toolbar Ribbons All command buttons are equipped with balloon help texts, which pop up when the cursor is held still at the button for a moment without pressing any keys. The toolbars changes according to selected menu option.

Workspace In the Workspace the different diagrams can be opened. These diagrams may be used for entering the network, building control circuits or sketching drawings.

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Element The Manager gives an overview of the opened projects, scenarios, diagrams and graphic layers. Additionally, all elements can be managed, which means they can be deleted, added, modified, activated or deactivated.

Symbol Window The Symbol Window contains all element symbols available. Apart from the standard symbol for some elements other symbols exist with a different graphical appearance but exactly the same characteristics. New symbols also can be created or existing symbols can be modified with the Symbol Library.

Message Window The message window is the channel to communicate with the user. It supplies information about the executed processes, error messages and further information.

Tutorial on Graphics Create a new project To create a new project, after having started the program, go to the following menu as displayed and select “New”.

Fig. 4-Tutorials. Menu to create a new project

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Type the desired Project name, and select the network medium type (power, gas, water or heating). Press create to create the new project.

Fig. 5-Tutorials. New project creation

The newly created projects is activated, and elements can be added.

Drawing a small network As first step, you'll enter nodes and elements to build a small electrical network. Select the AC Busbar option and also the orientation (vertical or horizontal) and draw it in the diagram with the mouse defining the beginning (clicking) and the end of the busbar (releasing) as shown below:

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Fig. 6-Tutorials. Adding the first node by drawing

After the busbar is drawn the related dialog will automatically appear for entering the parameters (name, nominal voltage, etc.):

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Fig. 7-Tutorials. Entering node’s nominal system voltage, frequency and name

Similarly add two more busbars, Bus-2 and Bus-3 assigning 65 kV to these. You should have a similar drawing as the following:

Fig. 8-Tutorials. Network consisting of 3 nodes only

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Now its time to add some elements in your network. To see the symbol window click the following tool:

Fig. 9-Tutorials. Making symbols visible

From the AC1-port element group select the symbol for Extrernal Grid as shown below and drag-drop it in a desired location within the working space. The dialog of the element will pop out. Leave all parameters as default.

Fig. 10-Tutorials. Adding External Grid (drag and drop)

In a similar way add also a load and enter the parameters as shown:

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Fig. 11-Tutorials. Add a load (drag and drop symbol of external grid)

From the AC 2-port element group select the 2W Transformer as shown below and drag-drop it in a desired location within the working space. The dialog of the element will pop out. Enter the parameters as shown:

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Fig. 12-Tutorials. Adding a transformer by draging and dropping the transformer symbol and entering transformer data

The various elements have to be connected to form a network. All connections in NEPLAN 360 are established with the same tool as shown below:

Fig. 13-Tutorials. Tool selection for element connection with nodes

After having selected the tool “Link/Line” the mouse has to be hovered over a node, which has to be connected with this element. When the node changes color and the cursor changes shape the link can be established with left clicking and keeping. To establish the end of connection hover over the port of transformer and release the mouse when the port changes color and shape. You should have the following:

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Fig. 14-Tutorials. Connection between a node and an element with a link

In a similar way, proceed and connect all elements as shown (leave lines for the end):

Fig. 15-Tutorials. Connection between nodes and all element without lines

A link between two busbars/nodes will be understood by the program as a power line which has electrical parameters. Establish the line as shown below:

Fig. 16-Tutorials. Inserting a line between two nodes

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The user can enter parameters as done previously with other elements, but also can select a line type from a library. This way parameters will be assign automatically. To assign a library type click the button shown below:

Fig. 17-Tutorials. Selection of line data from line library

The library type selector will show up. You can select the type you desire:

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Fig. 18-Tutorials. Selection of line type from library

After clicking OK, the parameters are assigned automatically, except for the name and the length which have to be assigned manually:

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Fig. 19-Tutorials. Line data are transferred from library to line in the project

Now the network is ready for calculations:

Fig. 20-Tutorials. Network ready for calculation

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You can show information about the network in the single line diagram, by going to Diagram Properties and activating the desired info. For this tutorial make the names of the elements visible:

Fig. 21-Tutorials. Diagram Properties for showing names of elements

Now the names should be visible as well:

Fig. 22-Tutorials. Showing names in the single line diagram

Open a project NEPLAN 360

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To open an existing project, go to the following menu as displayed and select “Open”:

Fig. 23-Tutorials. Menu to open a project

The project manager will appear. Here you have access to your own projects but you can also access the standard NEPLAN projects as read only. You can expand the folders to view the projects included.

Fig. 24-Tutorials. Open project selection and options

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Tutorial on Load Flow Calculation Load Flow calculation is a basic and most common for power systems. NEPLAN 360 offers state of the art implementations for robust, fast, and comprehensive Load Flow calculations in the most user friendly environment. This tutorial will help you start performing Load Flows in very short time. To start with the tutorial, please open the standard Load Flow example. This will be the network used for this tutorial and it is a read only project:

Fig. 25-Tutorials. Open the standard Load Flow example

Load Flow Parameters When you open any project, you can select the calculation to perform. Make sure that the selected calculation in Load Flow:

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Fig. 26-Tutorials. Selection of calculation type: Load Flow

Click on the button below to view the calculation parameters:

Fig. 27-Tutorials. Viewing the Load Flow calculation parameters

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Load Flow Calculation For this tutorial you will not modify any parameters. Now you are ready to perform your first Load Flow. It is as easy as clicking a button! Click the button shown below:

Fig. 28-Tutorials. Performing Load Flow calculation

During the calculation, information can be viewed in the Messages window, regarding the iteration process and any warnings or errors occurred. Also a dialog will inform you about the status of the calculation:

Fig. 29-Tutorials.

Analysis messages

Load Flow Results After a successful calculation, results can be obtained in many different ways. NEPLAN 360

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You can choose which results you desire to view in the single line diagram. To do so go to Diagram Properties / Results

Fig. 30-Tutorials. Accessing the result selection in “Diagram Properties”

Result variables are grouped for easier access. Below you can see the fields of variables regarding nodes/busbars and ports of the various elements. Also results which are special for each equipment type can be selected. This selection affects the visibility of these results in the single line diagram:

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Fig. 31-Tutorials. Node results

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Fig. 32-Tutorials. Port results

After clicking OK, observe the single line diagram. Now the results you selected should be visible:

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Fig. 33-Tutorials. Load Flow results on single line diagram

Another way to view Load Flow results is through tables. There are two kind of table results for Load Flow: • Summary results, where you can see the overview of the Load Flow. • Element results, where you see the detailed results of Load Flow for each element and node. To see the summary results click on the Summary button shown below. There you can see results regarding the whole network or regarding areas, zones or feeders you might have defined previously:

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Fig. 34-Tutorials. Summary table results for Load Flow

You can also get detailed table results for each and every element:

Fig. 35-Tutorials. Element table results for Load Flow

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These kind of tables can be sorted, filtered, copied or exported in various formats for further processing.

Tutorial on Short Circuit Calculation In this section, you will learn how to perform a Short Circuit calculation on a small network and how to get the desired results. Open the standard example "IEC 60909-1 for Short Circuit Calculation. In this example all data needed to run a Short Circuit calculation have been entered:

Fig. 36-Tutorials. Opening a Short Circuit example project

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Fig. 37-Tutorials. Example Network "IEC 60909-1"

Short Circuit Parameters As with all calculations, you have to provide the required parameters at first. For this example the parameters have been already assigned. To see the parameters make sure that you have selected the Short Circuit as calculation module and click the parameters button. From the parameters you might want to do the following: 1) Select the fault type. 2) Select the calculation method. 3) Enter a fault distance if you also want to display the results of nodes in the neighborhood of the fault location. 4) You might need to adjust the parameters depending on the calculation method and according to your needs.

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Fig. 38-Tutorials. Short Circuit parameters

You control where the Short Circuit should be applied. It can be on nodes:

Fig. 39-Tutorials. Selection of Short Circuit location (on nodes)

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Short Circuit Calculation After you define the Short Circuit parameters, and the faulted locations, you are ready to start a calculation. To do so click on the calculation button:

Fig. 40-Tutorials. Start Short Circuit calculation

Short Circuit Results After a successful calculation, results can be obtained in many different ways. You can choose which results you desire to view in the single line diagram. To do so go to Diagram Properties / Results. Result variables are grouped for easier access:

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Fig. 41-Tutorials. Selecting results to view for Short Circuit calculation

After the selection you can see the selected results in the single line diagram:

Fig. 42-Tutorials. Selecting results to view for Short Circuit calculation

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Another way to view Short Circuit results is through tables. Click the Element button to view the Short Circuit results in table:

Fig. 43-Tutorials. Short Circuit results in Summary

These kind of tables can be sorted, filtered, copied or exported in various formats for further processing. Also reports can be generated automatically. For these reports you can define in a template the data need to be shown, and various other info regarding your company, logos etc.:

Fig. 44-Tutorials. Summary Report of Results of Short Circuit calculation

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Tutorial on Dynamic Simulator |contextid=9001 In this section, you will learn how to perform a simulation with the Dynamic Simulator on a small network and how to get the desired results for a transient stability study. Open the standard example Kundur_SMIB as shown below:

Fig. 45-Tutorials. Opening standard examples for Dynamic Simulation

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A simple network with one synchronous machine and an external grid representing the rest of the network, appears:

Fig. 46-Tutorials. Simple network example for Dynamic Analysis

All parameters and settings to run a Dynamic Analysis have been pre-entered. In this tutorial we will go through the basic steps to getting started with the Dynamic Simulator. More details about variables and settings can be found in the Manual under section Dynamic Analysis. It can be seen that except the elements of the network, also two controllers have been entered. The AVR and PSS controllers refer to the Synchronous Machine „Gen”. This can be verified by double clicking the machine symbol and going to the Dynamic Analysis/Connection Frame:

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Fig. 47-Tutorials. Connection Frame of Synchronous Machine

You can double click the AVR symbol to view or modify the data of it. There you can define the type of the controller, the model of it and the parameters of the model:

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Fig. 48-Tutorials. Controller dialog

For details on each controller variable refer to the manual on the relevant section. You can see the block diagram of the selected controller by clicking the button “Show Image”:

Fig. 49-Tutorials. Selected controller block diagram

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When the model of the network and controllers is ready, in order to use the simulator the following settings have to be given: • simulation parameters • events (outages, faults, load changing etc.) • screen plots to view the system variables vs time To provide these settings please click on the Parameters button as shown below:

Fig. 1.50 Parameters of Dynamic Analysis

Dynamic Simulation Parameters The dialog of Dynamic Analysis Parameters appears. By default you see the area of simulation parameters first. For the tutorial you will use the default settings here. Detailed description on the meaning of each field exist in the manual section “Dynamic Analysis”. Important is to focus on three concepts: 1) With the current settings, dynamic simulation uses the Load Flow as the initial steady state of the system. This state will be considered as the system state before any disturbance/event occurs. 2) The analysis is performed using the RMS-DQ0 representation. Alternative is the RMS-ABC (phase representation). The EMT-ABC refers to electromagnetic transients not covered in this tutorial. 3) The program will simulate the system behavior for 5 seconds in total

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Fig. 51-Tutorials. Simulation parameters

Dynamic Simulator Events After setting the simulation parameters, as described before, you need to define the various events. These are occurrences happen to the system and disturb the steady state of the system. You can define any kind of event such as opening of a line, setting a short circuit, losing part of a load or generation etc. and the exact time that this occurs. Also a series of events can be entered, treated as a group event. To view the events click on the Events tab:

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Fig. 52-Tutorials. Events occuring to the system

As seen in the event definition, a three phase fault will be simulated on Bus2 along with its clearance. This fault will be applied in 1.1sec after the beginning of the simulation, and will be kept for 0.07sec. Further occurrences can be added in this event. Also new events can be defined and you can activate or deactivate events according to what you want to simulate. For this tutorial the pre-entered event will simulated.

Dynamic Simulator Screen plots Finally you need to define what you expect to see as result. A simulation involves numerous of system variables which change in time. Depending what kind of study you perform, you might want to specify the screen plots. For example in a transient stability study, the synchronous rotor angles are of a great importance. To see and modify the screen plots, click on the Screen Plot tab:

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Fig. 53-Tutorials. Screen plot definition dialog

A set of screen plots has been pre-defined. Generally you can add a variable with the following steps: 1) Select the node/element that this variable refers to 2) Select the variable 3) Click the button “Add Variable”

Fig. 54-Tutorials. Steps to add a variable in the screen plot

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To show plots NEPLAN 360 uses the following structure: Diagrams->Plots The number of diagrams, plots and subplots defined by the user:

Fig. 55-Tutorials. Diagrams and plots definition

In this example, there will be five diagrams, Diagram1 and Diagram2. For Diagram1 there will be two Plots, one for frequency W and one for the excitation voltage. For Diagram2 there will be one Plot, so every voltage VT will be shown in the same Plot. For Diagram3 there will be one Plot, showing the VD and VQ variables of Line23b. For Diagram4 there will be one Plot, showing the amplitude and angle of the current of Line23b.

Dynamic Simulator Results Now you can perform a dynamic simulation simply by clicking the button:

Fig. 56-Tutorials. Starting the simulation

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The defined screen plots will appear automatically. You can navigate through the defined diagrams and see the results:

Fig. 57-Tutorials. Voltages in pu of the three buses

For example, it can be clearly seen in Diag. 2, the voltage dip occurring during the fault, and the following voltage change until system balances again.

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Tutorial on Overcurrent Protection Element Characteristics Open the NEPLAN standard example “OvercurrentProtection”.

Fig. 58-Overcurrent Protection. Opening project

In the ribbon Home: "Analysis – Overcurrent Protection - Parameters – Parameters" menu option, enter the two reference voltages that should be used for the selectivity charts. This allows the user to automatically create the selectivity charts for the last short circuit calculation.

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Fig. 59-Overcurrent Protection. Parameters

Check if all the required protection devices have their time-characteristics in the respective characteristics dialog window of the element. 1. “Characteristics” in case of an overcurrent relay 2. “Trip Characteristic” in case of a circuit breaker (Only for LV circuit breaker with release and LV Miniature circuit breaker) 3. “Curve” in case of a fuse Double click the protection devices of the overcurrent relay: “DefTime Relay”, circuit breakers: “Main Incomer” and Outlet Sub Distrib.” and Fuses: “Outlet Fuse” and “Outlet Motor Fuse”.

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Fig. 60-Overcurrent Protection. Protection in single line diagram

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Fig. 61-Overcurrent Protection. Characteristics of protection equipment

Start Calculation In order to view the already existing charts for this standard example, just select “Overcurrent Protection” from the analysis menu and click on the “Chart” button. To plot a new selectivity chart with time-current curves of the elements as well as the short-circuit current, select the whole network with the mouse. Then select “Overcurrent Protection” from the analysis menu and click on the “Chart” button. A message window will pop-up with a message “Do you want to create a new diagram with the selected elements?” Click on “OK”. This will create a new empty chart with a single-line diagram in the “Plot” sidebar.

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Fig. 62-Overcurrent Protection. Calculation

Plot Curves To plot a new chart for a short-circuit calculation, select a faulted busbar from the single line diagram in the “Plot” sidebar. Set the short circuit calculation parameters by clicking on “Short Circuit Settings” button. To plot the curves, click on the “Add short circuit from diagram”. This will add the following curves to the new chart:

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1. Resulting short circuit current at the faulted location 2. Short circuit current seen by the protection devices which tripped. All the short circuit currents are referred to the reference voltage UB1. If the difference between the currents seen by several protection devices is less than 10A, then only one current is plotted on the chart. 3. Time-current curves of the protection devices which tripped 4. Element capability curves of the protected elements (cable, transformer, etc.)

Fig. 63-Overcurrent Protection. Selectivity Charts

Edit Charts The annotation labels of the curves can be moved easily with the help of the mouse, so that each curves is recognizable. In order to change the font size of the annotations, X and Y-axes legends and scale settings, click on the “Style” sidebar. All the short-circuit currents will be listed in the Circuits” sidebar. To view the single line diagram on the chart in an image format, select the option “Show Single line diagram” in the “Style” sidebar. This image can be resized and repositioned as required.

Adjust Protection Device Settings In the “Element” sidebar, the protection functions which are not required can be unchecked in the “Protection function” dropdown list. For example, in case of 3phase short circuit, the earth fault protection functions can be unchecked so that they will not be shown on the chart.

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After plotting the curves on the chart, the protection device settings (for overcurrent relay and circuit breaker with release) can be adjusted to the short circuit current in order to achieve proper co-ordination of the protection devices. This can be achieved either by moving the curve directly in the chart by selecting the curve with the help of the mouse or with the help of the navigation arrows. The vertical and horizontal distances between the curves can measuring with the available measuring tools. To measure the distance follow the given steps: 1. Select the two curves between which the distance has to be measured 2. The click on the respective measuring tool button 3. The ruler then appears on the chart between the selected two curves. It can be slided over the curve to measure the distance at different points by selecting it with the mouse. To delete the ruler, double click on it

Fig. 64-Overcurrent Protection. Adjusting characteristics in selectivity charts

Print and Export The option to print the charts and to export them to PDF, WORD, EXCEL or PNG format is available under the “Charts” sidebar.

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