elec calc DC, the Module for Direct Current

June 22, 2020

The DC module “Direct current” is an additional module of elec calc. It allows the design and sizing of low voltage electrical installations in direct current, up to a voltage of 1500 VDC. Completely integrated into the elec calc software, it maintains all of its functionality and ergonomics and allows the creation of installations mixing DC and AC parts.

It meets the sizing needs of auxiliary networks (control and command) and general distribution, excluding those relating to specific standardization or regulations (photovoltaics, rail traction, etc…).

REFERENCE DOCUMENTS

Being part of low voltage networks, the applicable electrical installation standards are identical to those of AC networks, mainly those of the IEC 60364 series or their national versions. For the calculation of short-circuit currents, reference should be made to the series of standards IEC 61660.

THE MANAGED COMPONENTS

The following DC sources are managed for a 2-wire power supply with TNC, TNS, or IT earthing system:

  •   –  Rectifier only: the essential input data are nominal power, cos ϕ, efficiency, output voltage, maximum short-circuit current, and its holding time.
  •   –  Battery: the essential input data are the output voltage and the maximum short-circuit current. Capacity can be indicated for information.
  •   –  Rectifier/battery assembly: the input data is a combination of that of the two constituent elements.

The following receivers are managed in the DC module:

  •   –  Plugs/sockets (single or multiple)
  •   –  Lighting (single or multiple)
  •   –  Resistive loads (single or multiple)
  •   –  Generic receivers

The following switching and protection devices are managed in the DC module:

  •   –  Switches
  •   –  Contactors
  •   –  Fuses
  •   –  Thermal magnetic circuit breakers
  •   –  Magnetic only circuit breakers


CALCULATIONS AND VERIFICATIONS

The following calculations are carried out like for AC installations in accordance with the aforementioned reference documents:

  •   –  Design currents and power balance
  •   –  Cable sizing
  •   –  Calculation of short-circuit currents
  •   –  Sizing of overload and short-circuit protections
  •   –  Calculation of voltage drops
  •   –  Calculation of thermal stresses

elec calc performs all the verifications which guarantee compliance with the reference documents and reports, where applicable, the alert or non-compliance points detected.

ELEC CALC AND THE CHOICE OF SWITCHING AND PROTECTION DEVICES

The switching and protection devices used in direct current have different characteristics from those used in alternating current. In addition, for multiple switches and circuit-breakers, it is necessary to manage the different cablings of the poles in order to have the relevant data. Note also that the breaking capacity of circuit-breakers is dependent on the network time constant (L / R ratio) which must, therefore, be known.

elec calc provides users with specific manufacturer catalogs for the switching and protection devices used in DC. The user can also manage his own catalogs as for the other components.

Important Links Bar.jpg

https://www.trace-software.com/blog/elec-calc-dc-the-module-for-direct-current/

 

Related Articles

Network Infrastructure Featured Product Spotlight

PBUS 14 Panduit logo 400

This webinar presented by Beth Lessard and Keith Cordero will be highlighting three Panduit solutions that will optimize network equipment and cabling to ensure that your spaces are efficiently and properly managed to support ever-evolving business needs of today and beyond. Products that will be featured include PanZone TrueEdge Wall Mount Enclsoure, Cable Managers, and Adjustable Depth 4-Post Rack.

REGISTER HERE


Editor’s Pick: Featured Product News

Siemens: SIMOVAC Non-Arc-Resistant and SIMOVAC-AR Arc-Resistant Motor Controllers

The Siemens SIMOVAC medium-voltage non-arc-resistant and SIMOVAC-AR arc-resistant controllers have a modular design incorporating up to two 12SVC400 (400 A) controllers, housed in a freestanding sheet steel enclosure. Each controller is UL 347 class E2, equipped with three current-limiting fuses, a non-load-break isolating switch, and a fixed-mounted vacuum contactor (plug-in type optional for 12SVC400). The enclosure is designed for front access, allowing the equipment to be located with the rear of the equipment close to a non-combustible wall.

Read More


Sponsored Content
Electrify Your Enterprise

Power is vital to production, and well-designed control cabinets are key. Allied Electronics & Automation offers a comprehensive collection of control cabinet solutions including PLCs, HMIs, contactors, miniature circuit breakers, terminal block connectors, DIN-rail power supplies, pushbutton switches, motor starters, overloads, power relays, industrial Ethernet switches and AC drives engineered to keep your operations running safely, reliably and efficiently.

Learn more HERE.


Products for Panel Builders

  • AutomationDirect: WAGO ECO2 Series Power Supplies

    AutomationDirect: WAGO ECO2 Series Power Supplies

    AutomationDirect has recently added WAGO Eco2 series power supplies that offer performance and value, featuring high efficiency and a compact, space-saving design, making them ideal for space-limited applications. These economical power supplies provide reliable performance and long service life for a variety of applications such as industrial automation, building management systems, machine control, and robotics. Read More…

  • Banner Engineering: Q2X Miniature Photoelectric Sensor

    Banner Engineering: Q2X Miniature Photoelectric Sensor

    Banner announces two new modes to the Q2X series of miniature photoelectric sensors: Laser Measurement and the Fixed-Field. The Q2X Laser Measurement sensor’s powerful beam can measure farther with the industry’s longest sensing range for a sensor in a compact housing, while the Q2X Fixed-Field sensor simplifies installation with no configurations or setup required. Read More…