CTDim 3.7

CTDim is a Siemens product for analyzing and sizing current and voltage transformers in power systems. It is specifically designed for precise location and fault detection in power distribution systems. CTDim can use current, voltage and pressure data and use advanced algorithms to detect faults in power systems.

The advantages of using CTDim software include high accuracy, high speed, and easy configuration. It also provides comprehensive reporting capabilities that allow users to use it to analyze their data.

A simple check of the selected CTs and VTs data is carried out to ensure that they comply with the requirements of the connected devices. The cores of the protective and measuring CTs are also included. In addition, it is possible to determine the dimensions and installation of the protective and measuring voltages.

Create complete reports: Short and long reports are automatically prepared (editable RTF format).

Supports overcurrent protection, distance protection, line differential protection, transformer protection, generator protection, motor protection, load protection (arm), also has extensive settings for high-resistance protection schemes.

Support for gapped and non-gapped CT cores:

• IEC protection classes of CTs: 5P/10P, 5PR/10PR, PX (Former BS Class X), TPX, TPY, TPZ
• ANSI protection classes C, T and X
• IEC measurement classes: 0.1, 0.2, 0.5, 1, 3, 0.2S and 0.5S

Transient simulation of CT behavior (e.g. time to saturation) for all classes of protective CTs and protection devices mentioned.

The COMTRADE output file function responds to the study and hardware testing of protection devices.

Estimation of internal CT resistance (Rct)

Supports a long list of meters and relays: Siemens SIPROTEC numerical relays (SIPROTEC 3, SIPROTEC 4, SIPROTEC 5) as well as a large number of non-Siemens devices

CTDim is a tool for selecting and dimensioning current transformers (CT) and voltage/potential transformers (VT/PT). By optimizing the selection of CT and VT data according to the technical requirements of power system protection and/or measurement, engineering and manufacturing costs are significantly reduced while maintaining technical excellence.

CTDim Benefits

The advantages of using CTDim are:

• CT and VT load testing helps prevent severe underloading of precision instrument transformers and also helps in determining the specifications of precision instrument transformers.
• Save on engineering and manufacturing costs by optimizing CT and VT data.
• Taking into account the latest international instrument transformer standards.
• Powerful reporting tool that clearly displays selection steps using dynamic RTF text format that can be read by any word processing program.
• Flexible customization of user-defined data for precision instrument transformers and voltage/potential transformers increases calculation time.
• Exportable simulation curves for further analysis and even relay testing regarding CT saturation, especially for systems with high X/R ratios.
• The CT data optimization routine allows users to arbitrarily select CT parameters that are appropriate for the current application.

New version features (v3.7)

• Technical dimension and optimization of selected CTs according to the new standard IEC 61869-2 (previously IEC 60044-1, IEC 44-6) and ANSI C57.13-2016.
• Accurate calculation software that allows the determination of the transfer characteristics of TPX, TPY, TPZ class protective cores as per the latest IEC 61869-2 / 61869-100 standards.
• Transient transient simulation for the following classes: IEC: 5P/10P, 5PR/10PR, 5PR (Ts), PX, PXR, TPX, TPY, TPY (Ts), TPZ ANSI: C, T, X; BS: X Results can be exported as Comtrade files.
• The tools for calculating the maximum fault current are set as per the latest IEC 60909-0:2016 standard.
• The list of protection and measuring devices has expanded significantly.
• Supports relays with multiple protection functions (ANSI codes).
• Significant improvement in user guidance for process selection and optimization.