Arc Flash Option ^{Version 3.12.1 : Feature 8137 24/08/2023}

A new option has been provided that enables you to set the number of decimal places used for the display of Incident Energy in Arc Flash results.

ERACS Curve Digitiser ^{Version 3.12.1 : Feature 8121 24/08/2023}

A new utility has been provided that will enable you to digitise any curve that can be presented on your computer monitor. It can be utilised to digitise any curve, but you will find it extremely helpful when it comes to digitising fuse characteristics, enabling them to be loaded directly into an ERACS library. Facilities are also provided that enable the digitised curve to be exported to CSV file, where the curve can then be utilised outside of ERACS. Access to the ERACS Curve Digitiser is made available from within ERACS by selecting Utilities from the Tools menu.

Arc Flash Option ^{Version 3.12.1 : Feature 8053 24/08/2023}

During the protection study that underpins each Arc Flash Incident Energy calculation, where the fault is energised via multiple infeeds, as each infeed is removed it is possible for the bolted fault current to fall below the minimum level supported by IEEE Std 1584-2018. Should that occur, it is no longer possible to determine an arcing current, which means clearance time and consequently incident energy cannot be determined. Should this condition occur, ERACS now provides a setup parameter, labelled "If Bolted Fault Current falls below 1584-2018 minimum during study, calculate Incident Energy up to that point", allowing you to choose what to do…

1. If ticked, Incident Energy will be calculated up to the point at which Bolted Fault Current falls below the minimum threshold. Where this approach has been employed, a tilde (~) symbol will be appended to appropriate values.
2. If unticked (the default), Incident Energy will not be calculated when Bolted Fault Current falls below the minimum threshold and a BCBM (Bolted fault Current fell Below Minimum) acronym will be used in place of the values which couldn't be determined.

Protection Relay Data Entry Window ^{Version 3.12.1 : Feature 8020 24/08/2023}

ERACS assumes that the rated current of a protection relay's current transformer (CT) is equal to the relay's current rating. To provide a little more information, we have included a label alongside the CT Primary Rating field that displays the relay's rating and therefore the secondary rating of the CT.

Element Selection Sensitivity ^{Version 3.12.1 : Feature 7983 24/08/2023}

Facilities have been provided to make it easier to select busbars and branches, as well as connect elements to busbars. The new settings are available in the "General" page of the "Program Options" facility that is available via the "Tools" menu. Two new controls have been provided...

1. "Busbar Selection Sensitivity", with these options: fine, standard & coarse.
2. "Branch Selection Sensitivity", with these options: fine, standard & coarse.

Arc Flash Option ^{Version 3.12.1 : Feature 7962 24/08/2023}

A new option has been provided that enables you to configure the Arc Flash Report so that Incident Energy units (J/cm^2 or cal/cm^2) are set independently from distance units (metric or imperial). This means that Incident Energy can now be reported in cal/cm^2, whilst distance units are presented in metric units.

Web Licence Credentials ^{Version 3.12.1 : Feature 7932 24/08/2023}

The following characters can now be included in web licence credentials: ".", "@", "£" and "-".

Arc Flash Report ^{Version 3.12.1 : Feature 7876 24/08/2023}

The Arc Flash report has been improved to explicitly state whether Arcing Current or Reduced Arcing Current gave rise to the final Incident Energy value. The value is also included in the Standard and Extended CSV result export.

Database Creation ^{Version 3.12.1 : Feature 7875 24/08/2023}

A "Create Independent Copy" item has been included in the "Database" menu that enables you to easily create a new database, copying networks from the currently open database and then opening the new database.

Updated Reference Library ^{Version 3.12.1 : Feature 7832 24/08/2023}

Models covering Atom cable sizes 6 mm² to 400 mm² have been added to the ERACS Reference Library.

Arc Flash Enclosure ^{Version 3.12.1 : Feature 7822 24/08/2023}

A new duplicate facility has been added to the Busbar data entry form that will enable a new arc flash enclosure to be easily create by duplicating one of the existing enclosures.

Arc Flash Enclosure ^{Version 3.12.1 : Feature 7821 24/08/2023}

An option has been provided in the Arc Flash Enclosure data entry form, the Busbar data entry form and the Arc Flash study setup window that enables you to select the Protection Device whose clearance time will be employed to calculate incident energy for an arc flash enclosure.

Arc Flash Report ^{Version 3.12.1 : Feature 7820 24/08/2023}

A filtering option has been added to the Arc Flash Report that enables you to show only the worst case (in terms of Incident Energy) Enclosure per Busbar; that is, hide all Enclosures at a Busbar which don't produce the worst-case result.

Updated Reference Library ^{Version 3.12.1 : Feature 7804 24/08/2023}

Models representing the overcurrent and earth fault functions of Woodward's HighPROTEC MCDGV4 generator protection relay have been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7753 24/08/2023}

A model representing Leroy-Somer's LSA 53.2 XL13 4p synchronous generator has been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7734 24/08/2023}

A model of FG Wilson's Frame 9124H WDG 6S, 2 MVA, 415 V synchronous generator has been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7732 24/08/2023}

Models representing the overcurrent and earth fault functions of Schneider Electric's MiCOM P141 / P142 / P143 / P145 relays has been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7724 24/08/2023}

Models representing the overcurrent and earth fault functions of Schneider Electric's MiCOM P120 / P121 / P122 / P123 relays have been added to the ERACS Reference Library.

Python Interface ^{Version 3.12.1 : Feature 7685 24/08/2023}

A number of new features and improvements have been made to the Python Interface and are documented at the link below.

Associated Links:

• Modifications to Python Interface (https://www.eracs.co.uk/python/docs/1.1.5/index.html#notable-changes-from-previous-interface-version)

Updated Reference Library ^{Version 3.12.1 : Feature 7679 24/08/2023}

Models that represent the overcurrent and earth fault functions of Schweitzer Engineering Laboratories' SEL-751A relay have been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7674 24/08/2023}

Models that represent the overcurrent and earth fault functions of Schneider Electric's Easergy P3F30 and P3L30 relays have been added to the ERACS Reference Library.

Visualising Directional Relay Polarisation ^{Version 3.12.1 : Feature 7670 24/08/2023}

The polarisation quantities for the earth and phase functions of a directional relay can now be plotted on a chart, providing a visual indication of the relay's polarisation variables and clearly demonstrating whether the fault current is flowing in the correct direction for the relay to detect the fault.

Arc Flash Report ^{Version 3.12.1 : Feature 7666 24/08/2023}

The export facilities of the Arc Flash report have been improved, providing all of the fields necessary to replicate the calculation in an external validation tool (e.g. the Arc Flash IE and Iarc Calculators available on the IEEE DataPort website).

Protection Device Results ^{Version 3.12.1 : Feature 7663 24/08/2023}

The following results have been provided for directional relays:

• Polarisation voltage magnitude.
• Polarisation voltage angle.
• Maximum torque angle.
• Current angle.
• Operating angle.

Updated Reference Library ^{Version 3.12.1 : Feature 7646 24/08/2023}

Models of Wilson Power Solutions' Tier-1 and Tier-2 1600 kVA, Dyn11 transformers have been added to the ERACS Reference Library.

Arc Flash Study ^{Version 3.12.1 : Feature 7637 24/08/2023}

An option has been provided in the Arc Flash study setup window to employ a simplified method for calculating Incident Energy when multiple protection devices have cleared the fault, rather than the default method of calculating Incident Energy after each protection device has operated and then summing all of the calculated values together. The simplified method uses the initial fault current and total fault duration to calculate a single Incident Energy result.

Update Reference Library ^{Version 3.12.1 : Feature 7632 24/08/2023}

A model of the Marelli Motori MJB 450 LB 4 synchronous generator has been added to the ERACS Reference Library.

Switch Group Manager ^{Version 3.12.1 : Feature 7594 24/08/2023}

The Switch Group Manager window has been improved, where it is now possible to execute multiple actions without the form closing after each one and the window now opens in the position it was last placed.

Arc Flash Study ^{Version 3.12.1 : Feature 7573 24/08/2023}

A new feature has been added to the Arc Flash calculation that enables you to select a protection device whose clearance time will be employed to calculate incident energy.

Report for Relays without Circuit Breaker Links ^{Version 3.12.1 : Feature 7507 24/08/2023}

A report is created at the start of a Protection Co-ordination study that will list all protection relays that do not have a link to a circuit breaker. The report provides easy access to each of the relays so that a link can be created.

Arc Flash Option ^{Version 3.12.1 : Feature 7503 24/08/2023}

Further information about this feature is available using the associated link below.

Associated Links:

• ERACS Reference No.8137 (https://releasenotes.eracs.co.uk/version/3.12.1/8137)

Database and Library Selection ^{Version 3.12.1 : Feature 7475 24/08/2023}

The database and library selection windows have been updated with controls that enable you to…

• move up a folder from the currently selected folder.
• paste a folder path from the clipboard.

Cable and Transmission Line Results ^{Version 3.12.1 : Feature 7451 24/08/2023}

It is now possible to display the results for each end of a cable and transmission line independently. That is, one can turn the results for the first connected end off, whilst leaving those associated with the second connected end on.

Shunt Capacitor NFPA 70E Dataset ^{Version 3.12.1 : Feature 7339 24/08/2023}

The shunt capacitor data entry window has been updated to allow you to define the data required for the capacitor hazard analysis described in the NFPA 70E-2021 standard.

Updated Reference Library ^{Version 3.12.1 : Feature 7298 24/08/2023}

A model of Stamford Frame HV 804 R WDG 83 synchronous generator has been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7296 24/08/2023}

A model representing the Stamford PE734C synchronous generator has been added to the ERACS Reference Library.

Updated Reference Library ^{Version 3.12.1 : Feature 7295 24/08/2023}

A model representing the Stamford UCI224G - Winding 311 synchronous generator has been added to the ERACS Reference Library.

Cable and Transmission Line Derating Factor ^{Version 3.12.1 : Feature 6603 24/08/2023}

A new data entry field has been provided in the Cable and Transmission Line data entry forms. The field, labelled "Derating Factor", enables you to specify a derating factor that will be applied to the element's current rating, enabling you to take into account the effect of surrounding conditions, such as ambient temperature and proximity to other circuits.

Visualising Directional Relay Polarisation ^{Version 3.12.1 : Feature 5713 24/08/2023}

Further information about this feature is available using the associated link below.

Associated Links:

• ERACS Reference No.7670 (https://releasenotes.eracs.co.uk/version/3.12.1/7670)

Cable and Transmission Line Derating Factor ^{Version 3.12.1 : Feature 5260 24/08/2023}

Further information about this feature is available using the associated link below.

Associated Links:

• ERACS Reference No.6603 (https://releasenotes.eracs.co.uk/version/3.12.1/6603)

Synchronous Machine Reactance Selection ^{Version 3.12.1 : Feature 4454 24/08/2023}

A new item, labelled Synchronous, has been included in the synchronous machine reactance selection provided by the Classic Fault, Protection Co-ordination and Arc Flash study setup windows. When selected, the impedance of each synchronous machine that includes the Park's dataset is set to Rs + j.Xd. Where; Rs = stator resistance and Xd = direct axis synchronous reactance.

Cable and Transmission Line Derating Factor ^{Version 3.12.1 : Feature 3510 24/08/2023}

Further information about this feature is available using the associated link below.

Associated Links:

• ERACS Reference No.6603 (https://releasenotes.eracs.co.uk/version/3.12.1/6603)

Cable and Transmission Line Derating Factor ^{Version 3.12.1 : Feature 2660 24/08/2023}

Further information about this feature is available using the associated link below.

Associated Links:

• ERACS Reference No.6603 (https://releasenotes.eracs.co.uk/version/3.12.1/6603)