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User Guide

Date: January 2013

Issue: 1.1

MODCurve User Manual

Page: 1 of 31 Issue: 1.0

NHP Electrical Engineering Products - MODCurve Manual

Table of Contents 1.0 Pre use information .............................................................................................................. 2

1.1 Product Support .................................................................................................................... 2 1.1.1 Hardware Requirements ................................................................................................ 2 1.1.2 Installing MODCurve ...................................................................................................... 3

2.0 Introduction to Selectivity and Cascade ............................................................................... 3 2.1 Selectivity (Discrimination) .................................................................................................... 4 2.2 Carrying out a Selectivity analysis ........................................................................................ 5

3.0 Getting started with the MODCurve screen .......................................................................... 6 3.1 File Menu .............................................................................................................................. 6 3.2 Components .......................................................................................................................... 7 3.3 Selectivity graph .................................................................................................................... 7 3.4 Report ................................................................................................................................... 7 3.5 About ..................................................................................................................................... 7 3.6 Defining the supply characteristic ......................................................................................... 8

3.6.1 Power Source Name ...................................................................................................... 9 3.6.2 Add HV Fuse ................................................................................................................. 9 3.6.3 HV Voltage (KVA) .......................................................................................................... 9 3.6.4 Impedance (%) ............................................................................................................ 10 3.6.5 Rating KVA .................................................................................................................. 10 3.6.6 System Voltage (LV Terminals) ................................................................................... 10

3.7 Adding a protection device (circuit breaker, fuse or user defined) ...................................... 11 3.7.1 Circuit Name ................................................................................................................ 12 3.7.2 Circuit Breaker Type .................................................................................................... 12 3.7.3 Overcurrent Release Type ........................................................................................... 12 3.7.4 Rated Current .............................................................................................................. 12 3.7.5 Number of poles .......................................................................................................... 13 3.7.6 Part Number ................................................................................................................ 13 3.7.7 Centre Line .................................................................................................................. 13 3.7.8 Isc (prospective short circuit current) at incoming connection –Manual input ............. 13 3.7.9 Isc at incoming connection –Automatic calculation using cable .................................. 14 3.7.10 User Defined curve ...................................................................................................... 15

3.8 Displaying a protection device curve on the graph ............................................................. 17 3.9 Adjusting a protection device curve on the graph ............................................................... 17

3.9.1 Setting Adjustment ....................................................................................................... 18 4.0 Protection Device and curve information ............................................................................ 20

4.1 Characteristic curves for circuit breakers ............................................................................ 20 5.0 Printing a report .................................................................................................................. 26 6.0 Saving a circuit ................................................................................................................... 28 7.0 Opening a circuit ................................................................................................................. 29 8.0 Changing the curve colours and line thickness .................................................................. 29 9.0 Disclaimer ........................................................................................................................... 31




Introduction Thank you for your interest in the NHP-MODCurve Selectivity Analysis Software Package. MODCurve is a stand-alone software package and has been designed and developed by NHP specifically for the Australian and New Zealand markets. MODCurve has been shaped around the extensive range of NHP circuit breakers, but also includes a large number of complimentary protective devices such as low and high voltage fuses commonly used in medium or high voltage systems. In addition MODCurve includes a ‘user defined’ curve function for increased flexibility. As a result, MODCurve can assist in protection device grading from the transformer primary to the point of final distribution. This document is intended as a guide to Selectivity and how to use the MODCurve to its maximum potential and achieve accurate results in any Selectivity studies that you carry out. 1.0 Pre use information 1.1 Product Support At NHP we consider ourselves to be at the forefront of Customer Support. As well as having an extensive range of product catalogues we deem ourselves experts in industrial switchgear, and we are more than delighted to pass on this knowledge to the industry as a whole. MODCurve has been designed to save time and effort in selecting a suitable piece of equipment for its correct purpose. Many hours have been spent in order to make MODCurve user friendly. However, should you require further assistance please contact your local NHP office or representative.

1.1.1 Hardware Requirements

MODCurve has been designed solely for use in Windows XP and above. The minimum hardware requirements are as follows: Windows XP or above Pentium PC or greater 32MB RAM (128MB recommended) 30MB free hard disk space 4MB video card (8MB recommended) pixel screen resolution (1024 x 768 recommended)




1.1.2 Installing MODCurve 1. Close all other applications that may be running on your computer 2. Download the MODCurve.ZIP file from the NHP web site 3. Extract the MODCurve.ZIP file into a local ‘NHP MODCurve’ directory on your PC. 4. Ensure all extracted files are located in the same directory as shown below:

Figure 1 –MODCurve Installation files

5. RUN the NHPModCurve.exe to start MODCurve. (If MODCurve fails to open and the error is MSSTDFMT.DLL not installed, please refer to help file ‘MOD_HELP.txt’. 6. Click the ‘START’ button on the splash screen to launch MODCurve.

2.0 Introduction to Selectivity and Cascade A higher reliance on electrical supply and safety in commerce and industry has increased awareness in circuit breaker technology and applications. Additionally, while maximizing system safety and reliability, consideration of overall costs is also of great importance. The combination of these factors has given rise to more precise methods of circuit breaker applications. Two common terminologies relating to general power distribution and system protection are: Cascading (Back-up) and Selectivity (Discrimination). Cascading is generally used where economics plays a significant part in system design. In this case an upstream breaker is used to “back-up” a lower specification breaker installed downstream to clear a fault current. Cascade is a concept that allows two circuit breakers to clear a fault instead of one. Normal Cascade applications allows a downstream circuit breaker to have a breaking capacity lower than the maximum prospective fault, provided it is backed up by an upstream device. Cascade provides for a more economical selection of downstream circuit breakers, however careful attention must be paid to the Cascade Tables supplied by each device manufacturer or supplier. For more information on Cascade applications please refer to the NHP Part C or CPB catalogues or contact your local NHP representative.

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The more complex analysis of Energy Let Through (I2t) and Peak Let Through (Ipeak) data is simplified by use of the Selectivity Tables, published in the NHP Part C catalogue or CPB pricelist, or available direct from NHP. The latest Selectivity Tables at time of MODCuve production are included in the MODCurve general catalogue. Generally a Selectivity Limit between two circuit breakers in series is no greater than the breaking capacity of the downstream device. However, under certain circumstances Selectivity can be “enhanced” beyond the breaking capacity of the downstream device provided it is backed up by an appropriately selected upstream device, which should not trip (unlatch) under stated conditions. 2.2 Carrying out a Selectivity analysis Carrying out an analysis of protective devices has increased in importance over recent times. It is no longer acceptable to select a device purely on rating and breaking capacity alone. It is now important to determine how a protective device will operate in conjunction with, or as a consequence of one or more other protective devices in an electrical distribution system. It is a common mistake to forget or simply ignore device commissioning, but this can lead to problems at a later stage. It is therefore important to carry out a Selectivity Analysis at the design stage of any electrical distribution system. The introduction of modern electronic or microprocessor technology to protection device has improved device performance and flexibility. However, with more flexibility comes the problem of device commissioning. Take a NHP MODPower Air Circuit Breaker (ACB) as an example. A standard in-built over-current relay (OCR) such as the MTX 1.0 has a large number of unique characteristic curves, all within one protection relay. Out of all curves it is important to know which one is best. Personal Computer based design tools such as MODCurve are obviously vital in determining the correct device setting in an electrical distribution system, and are commonly used for commissioning purposes.




3.0 Getting started with the MODCurve screen

Now that you have successfully installed MODCurve the first thing you are likely to do is add a device characteristic curve to the screen. Before you do this it is recommended you familiarise yourself with the screen layout. Below you will see a typical screen layout.

Figure 3 –MODCurve screen Every type of operation and/or function will be explained. 3.1 File Menu This menu contains all the relevant operations and access to Projects, whether they are being created, saved or recovered.

OPEN-> open an existing project file SAVE-> save project that is being worked on. SAVE AS-> save project that is being worked on under a new name.




3.2 Components This menu contains all the relevant access to add protective devices or delete protective devices from the Single Line Diagram (SLD).

SHOW COMPONENTS-> shows the ‘components’ dialogue box which allows access to protective devices such as circuit breakers and fuses which can then be added to the SLD. DELETE COMPONENT-> deletes the last protective device added to the SLD. CHANGE COMPONENT ORDER-> shows the ‘change component order’ dialogue box which allows changes to be made to the sequential order of the protective devices. For example if 4 circuit breakers have been added to the reticulation system, the final device (CB number 4) can be moved up the sequential order (for example from position 4 to position 2).

Figure 4 – Components dialogue box

3.3 Selectivity graph

This menu contains all the relevant access to protective device settings. EDIT GRAPH-> provides access to all the protective device OCR settings.

3.4 Report PRINT / PREVIEW-> This menu generates the selectivity study report.

3.5 About This menu shows the MODCurve version number.




3.6 Defining the supply characteristic When MODCurve is first started the below screen and ‘supply characteristics’ dialogue box will be displayed.

Figure 5 – new MODCurve screen on start up To define the transformer specification or add a HV fuse click on the transformer symbol. This will display the Supply Transformer Characteristics dialogue box as shown below.

Figure 6 – Clicking on the transformer symbol




The ‘Supply Characteristics’ dialogue box contains the following fields:

3.6.1 Power Source Name If known enter a name to identify the incoming power supply (15 characters available). The name will then display on the SLD upon clicking the OK button.

Figure 7 – Power Source Name field

3.6.2 Add HV Fuse

Clicking ‘Add HV Fuse’ will insert a HV fuse above the power supply. The rating of the HV fuse can be changed using the ‘Fuse’ drop down menu. The HV Fuse curve is displayed with tolerances by default. Clicking the ‘HV fuse centre line’ box turns the tolerances off.

Figure 8 – Add HV Fuse field

3.6.3 HV Voltage (KVA)

The voltage rating of the HV side of the LV transformer can be defined by clicking the HV Voltage (KVA) drop down menu.




3.6.4 Impedance (%)

The LV transformer impedance can be defined by clicking the Impedance (%) text field and entering a value (example 5). The UPDATE button must be clicked and this will update the Prospective Fault kA level. The impedance value directly affects the calculated prospective short circuit current ‘Isc’.

Figure 9 – Click the update button to update the Isc

3.6.5 Rating KVA The KVA rating of the LV transformer can be defined by clicking the Rating KVA drop down menu. The KVA value directly affects the calculated prospective short circuit current ‘Isc’ & full load current ‘Iflc’

3.6.6 System Voltage (LV Terminals) The System Voltage of the LV transformer can be defined by clicking the System Voltage (LV Terminals) down menu. The system voltage directly affects the calculated prospective short circuit current ‘Isc’ & full load current ‘Iflc’

Figure 10 – The LV system voltage can be changed

Once the ‘Supply Characteristics’ dialogue box has been completed click CLOSE.




3.7 Adding a protection device (circuit breaker, fuse or user defined)

From the ‘Components’ menu select ‘Show Components’, this will show the ‘Component’ dialogue box.

Figure 11 – Components dialogue box

Do not use the ‘Sources’ button as this is currently not functional. Click the ‘Protection Devices’ button and then the ‘Circuit Breaker and Fuses’ button. This will show the ‘Circuit Breaker Element Characteristic’ dialogue box.

Figure 12– Circuit Breaker Element Characteristic’ dialogue box




The ‘Circuit Breaker Elements Characteristics’ dialogue box contains the following fields:

3.7.1 Circuit Name If known enter a name to identify the circuit, for example ‘incoming ACB’ (12 characters available). The name will then display on the SLD.

Figure 13 – Circuit Name field

3.7.2 Circuit Breaker Type The circuit breaker type (ACB, MCCB, MCB, RCBO, FUSE, USER DEFINED) can be defined by clicking the Circuit Breaker Type drop down menu. The Circuit Breaker Type selection directly affects the ‘Overcurrent Release Type’ drop down box options. Note that the Isc (the calculated short circuit current) at the incoming terminals of the protective device will be shown in the top right hand corner. If the Isc is a higher value than the Icu (breaking capacity ultimate) of the protective device then the Isc value will be shown in RED. If it is lower, then the Isc text will be coloured black. This indication is a guide ONLY, the Isc Vs Icu automatic check should ALWAYS be double checked by the user.

3.7.3 Overcurrent Release Type The Overcurrent Release type is initially filtered by the selection made in the Circuit Breaker Type drop down menu.

3.7.4 Rated Current The protection device ‘rated current’ is initially filtered by the selection made in the Circuit Breaker Type and Overcurrent Release Type drop down menu.

Figure 14 – rated current menu




3.7.5 Number of poles The protection device ‘number of poles’ is initially filtered by the selection made in the Circuit Breaker Type and Overcurrent Release Type drop down menu. Devices could be 1, 2, 3 or 4 pole as per the MODBreak and MODPower general catalogue.

3.7.6 Part Number The protection device ‘part number’ is initially filtered by the selection made in the Circuit Breaker Type and Overcurrent Release Type, current rating and number of poles drop down menu. Part numbers are as per the MODBreak and MODPower general catalogue.

3.7.7 Centre Line The protection device (ACB, MCCB, MCB, RCBO, FUSE, USER DEFINED) curve is displayed with tolerances by default. Clicking the ‘Centre Line’ box turns the tolerances off.

3.7.8 Isc (prospective short circuit current) at incoming connection –Manual input If known enter the prospective short circuit current ‘Isc’ at the incoming terminals of the protective device. This can be left empty if the value is not known. The Isc value will then display on the SLD. First press the ‘Isc manual input’ button. Then enter the Isc value and press the ‘update’ button. The value (in the example below 30kA) will appear in the SLD.

Figure 15 – Isc field for manual input




3.7.9 Isc at incoming connection –Automatic calculation using cable If incoming cables to the protective device are known then the prospective short circuit current ‘Isc’ at the incoming terminals can be calculated approximately as a guide ONLY. Click the ‘Calculate Isc’ button and then the ‘Edit Cable’ button as shown below.

Figure 16 – Automatic Isc calculation Entering the Cable Length, cross sectional Area and number of parallel cables will result in the new Isc fault level being calculated. The ‘Update’ button must be clicked. Note that the current carrying capacity of the selected cables will also be displayed. PLEASE NOTE THAT MODCURVE IS NOT AN ELECTRICAL DESIGN TOOL. THESE CALCULATED VALUES ARE TO BE USED AS A GUIDE ONLY. NHP DOES NOT TAKE RESPONSIBILITY FOR THE ACCURACY OF THESE CALCULATED FIGURES.

Figure 17 – Cable selection and automatic Isc calcualtion Click CLOSE when the protection device characteristic are complete. Additional protective devices in ‘series’ can be added by again following the procedure started at 3.7.




3.7.10 User Defined curve A user defined curve can be entered into MODCURVE. Select User Defined (User) from the circuit breaker Type.

Figure 18– User defined device selection

Once selected click the ‘User Defined Setup’ button. Note that if the rated current is known it can be entered in the ‘Rated Current’ field, this will show on the SLD.

Figure 19– User defined setup

The easiest way to enter a user defined curve is to click the ‘import data’ button. Before doing this the time vs current values must be entered into an Excel sheet. Enter the Amps into the A column and the corresponding trip times into the B column of the Excel sheet.

Figure 20– User defined import data from Excel




Find the directory containing the excel file containing the user defined curve time current points and select:

Figure 21– Opening a previously created User defined curve from Excel Please wait for Excel to open. Select cell A1. Tab back to MODCURVE, the Import Range dialogue box will be displayed. Press the ‘Current Range’ button, the current excel range will automatically be imported. Tab back to the Excel sheet, click on cell B1. Tab back to MODCURVE and click the ‘Trip Time Range’ button. The trip time range will be automatically imported. Finally press ‘SAVE’. Excel will automatically close.

Figure 22– Setting the time / current range from Excel

The ‘User defined Curve Setup’ dialog box will now be fully populated. Click the ‘Save’ button and the dialog box will close. Alternatively from Figure 20 there is an ‘ADD’, ‘EDIT’ and ‘DELETE’ button. Time / Current plot points can be manually entered one by one. For example 900 could be entered into the ‘Current (Amps)’ field and 10000 could be entered into the ‘Time (Sec)’ field. By clicking the ‘Add’ button these values are saved into plot position 1. Repeat the process to add additional plot points.




3.8 Displaying a protection device curve on the graph

Each protective device has a ‘Show Curve’ box on the SLD. Click this box to display the devices curve. De-selecting the box will remove the curve from the graph. The show curve box must be selected to be able to adjust the curve.

Figure 23 – Show curve check box

3.9 Adjusting a protection device curve on the graph

Each protective device has a protection curve that can be displayed on the graph. A device will have either an adjustable curve (for example an ACB, electronic OCR MCCB and a Thermal / Magnetic MCCB) or a non-adjustable curve (for example an MCB, RCBO or Fuse). Select the ‘Selectivity graph’ drop down menu and choose the ‘protective device’ that requires adjustment (each device is sequentially numbered). Devices that are ‘greyed out’ have non-adjustable curves and therefore cannot be accessed.

Figure 24 – Accessing curve adjustments




3.9.1 Setting Adjustment Each protective device that has an adjustable curve has its own ‘setting adjustment’ dialogue box because of variations in OCR design and function. Below the ACB, Electronic MCCB and a Thermal Magnet MCCB setting adjustment dialogue boxes are shown. The protective device curves will move in real time as the settings are adjusted. For ACBs, set the Instantaneous settings first (or at least before the Short Time delay setting).

Figure 25 – ACB setting adjustment

Figure 26 – Electronic MCCB setting adjustment

Figure 27 – Thermal Mag MCCB setting adjustment




Definitions:

Device Setting Meaning

ACB

In* Nominal current rating with maximum OCR setting(ie a

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pick up (rated current) Tr Long Time Delay overload

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delay Ii Instantaneous pick up

current I2 SI O/L curve I4 EI P/O curve

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LTD OFF Turns off the OL protection Ratings Multiplier Defines the level of O/L

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Tr Long Time Delay overload time delay

LTD Dip Switch W Long Time Delay overload pick up (rated current)

STD OFF Turns off the STD protection

STD Dip Switch W Short Time Delay pick up current

Tsd Short Time Delay time delay

Ii Instantaneous pick up current

Thermal Magnetic MCCB

Thermo Setting Long Time Delay overload pick up (rated current)

Magnetic Setting Instantaneous pick up current

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5.0 Printing a report Select the ‘Report’ drop down menu and choose ‘Preview/Print’.

Figure 35 – How to display a preview of the report

A report will be automatically be generated.

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Use the scroll bar to move to the lower parts of the report.

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To print the report select ‘Print’ from the drop down menu. NOTE the report can be printed to a PDF only if this is available on your normal printer options.

Figure 39 – The report can be printed in hard copy of to a PDF

6.0 Saving a circuit Select the ‘File’ drop down menu and choose ‘SaveAs’ or ‘Save’. Choose a file name for the circuit and click ok. Note the file format is ‘.ini’. ‘Save’ will automatically overwrite the current file name, where ‘SaveAs’ will prompt for a new file name .

Figure 40 – The report and SLD can be saved to a file




7.0 Opening a circuit Select the ‘File’ drop down menu and choose ‘Open’. Choose a file name from the previously saved circuits and click ok. It may take 1 – 3 seconds for the file to fully load.

Figure 41 – The report and SLD can be opened from the a saved file

8.0 Changing the curve colours and line thickness The colour of the and the thickness of the lines can be adjusted. First select the protective device (ie the circuit breaker) so the characteristic box display. Close the characteristic box. Select the ‘Format Graph’ drop down menu.

Figure 42 – The curve colour and line thickness parameters can be altered




Then select ‘circuit element colour’ and choose between the available colours.

Figure 43 – Adjusting the curve colour The thickness of the lines can be adjusted. First select the protective device (ie the circuit breaker) so the characteristic box display. Close the characteristic box. Select the ‘Format Graph’ drop down menu. Then select ‘Draw Line Thickness’ and choose from the available line thickness levels (1 = light, 3 = heavy).

Figure 44 – Adjusting the curve line thickness




9.0 Disclaimer Important: Use of the MODCurve ZIP file from NHP and the software contained within is subject to the conditions that appear below. By using the MODCurve ZIP file and installing the software you signify that you have read and accepted those conditions. 1. The information embodied in the MODCurve ZIP file is, to the best of NHP’s knowledge current as at January 2013. NHP reserves its right to change or alter any of the information contained in the MODCurve ZIP file, including information about characteristics or specifications described in it at any time and without notice. 2. The MODCurve ZIP file and the information contained in it is provided for information purposes only. NHP does not make any representations or warranties (express or implied) as to the accuracy, currency or authenticity of The MODCurve ZIP file or that information. 3. NHP has used all due care in producing the MODCurve ZIP file. However, you acknowledge that this ZIP file may not satisfy your requirements or be free from errors or defects. The MODCurve ZIP file is supplied “as is” and, except where applicable legislation requires to the contrary, without warranties of any kind, NHP expressly disclaims all implied warranties including, without limitation, warranties of merchantability and fitness for the purpose. 4. The MODCurve ZIP file and the software contained are NHP Electrical Engineering Products Pty Ltd, 2013. Unauthorised reproduction, hiring, public performance, broadcast, diffusion or reverse engineering is prohibited. 5. Their respective proprietors own all trademarks, names, brands and logos referred to in the MODCurve ZIP file.

user guide - nhp electrical · 1. close all other applications that may be running on your computer...

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