Distribution & Transmission
System Analysis

CYME is an advanced and comprehensive world-class simulation package designed for power system analysis software, transmission, distribution and industrial energy systems. CYME has been developed for the elimination of complex problems that arise in the work of electrical engineers who take an active role in the planning and operation of the power grid.

CYME has been used for thousands of transmission, distribution and industrial projects worldwide for over 30 years.

  • Power Flow Analysis
  • Fault Analysis
  • Protection Coordination Analysis
  • Harmonic Analysis
  • Arc Flash Analysis

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Power Flow Analysis

CYMEFLOW is the power flow analysis module of CYME power engineering software, designed for three-phase electric power networks. It is equipped with powerful analytical options and alternative solution techniques.


“Perform power flow analysis at three-phase electrical power networks.”

Software Specification

The purpose of a power flow software is to analyze the steady-state performance of the power system under various operating conditions. This is a basic tool for the planning, design and operation of transmission, distribution or industrial power systems.

CYMFLOW uses the latest technology matrix / vector methods and multiple solution algorithms.

  • Full Newton-Raphson
  • Fast Decoupled
  • Gauss-Seidel

CYMFLOW is the module of CYME software used for the analysis of industrial and transmission power systems. CYMFLOW and other CYME software modules have a perfect interface.

CYMFAULT: For fault studies taking into account pre-fault system loading

CYMHARMO: For the calculation of the fundamental frequency voltage and current profiles required for harmonic distortion indices calculations

CYMSTAB: To set the initial condition of the system as required by the network control models for transient stability studies

Dynamic Motor Starting Module: To account for system wide voltage drops during induction and synchronous motor starting studies

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Fault Analysis

Short circuit analysis is a necessary tool for determining short circuit currents from various events, estimating the point where the short circuit occurs, controlling the short circuit resistance of the equipment and dimensioning various system components. The CYME software has a inclusive fault analysis module to assist engineers in evaluating the effects of short circuits with different intensity on overall system reliability.

“Evaluate the potential impact of short circuits in electrical systems.“

The information on the amplitude of the short circuit current that may occur at any point of an electrical system is important to ensure the reliability of the system. Irregular levels of current caused by faults lead to wear and damage to electrical equipment. The abnormal current level produced by faults put an important stress on the electrical equipment, and if the latter are not properly rated, it could lead to equipment damage, personnel injuries and system downtime.

The Fault Analysis Module of the CYME power engineering software is a comprehensive module offering various analyses and functionalities to help engineers carefully assess issues related to short-circuit.


Module Specifications

  • Conventional short-circuit calculations
  • IEC short-circuit calculations
  • ANSI® short-circuit calculations
  • Series fault analysis

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  • Simultaneous fault analysis
  • Voltage sag analysis
  • Fault locator
  • Equipment rating verification analysis

Protection Coordination Analysis

The Protective Coordination Analysis module is an indispensable tool to help power engineers effectively address protection issues by analyzing time-current curves. With an extensive library of over 15000 protective devices, an intuitive graphical plot and a broad range of tools and analyses, planning and validating protection schemes has never been easier with the CYME Power System Analysis Software.

“Verify and enhance your power system’s protection with CYME’s protective coordination analysis.”

The right selection of protective devices and their proper sizing are important issues for engineers desiring to reduce the impact caused by any shortcircuit on the network and to minimize equipment failures. CYME’s Protective Coordination Analysis module provides engineers with a wide range of tools.

  • Log-log plot to display timecurrent curves of protective devices such as fuses, relays, circuit breakers and reclosers
  • Library containing more than 100 000 curves from North American, European and Asian manufacturers
  • Online update of the library of curves
  • Inspection of the proper coordination for motor starting, transformer inrush and cable damage

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  • Tools to calculate precisely the time and current margins between curves
  • Modification of any setting to visualize the change interactively on-screen
  • Customizable display options for curve colors, tags and other grid options
  • Export function to easily include time-current plots in reports

Not only does CYME provide the useful tools listed above to make any study simple, it also offers advanced analyses to assist engineers in examining the coordination and protection range of the devices on the network more closely.

Harmonic Analysis

The number of electronic devices and other non-linear loads that are connected to the power system generate harmonics which affect the quality of the power to the end customers. Capacitors, which are installed to improve the system voltage and reduce losses, can create resonance if their location is not optimal. Such harmonic distortions, if un-mitigated, have a detrimental effect on the power quality as they can cause equipment malfunction, overheating of equipment and increase power losses.

harmonik analizi

“Perform frequency scan and voltage and current distortion calculations on balanced and unbalanced systems.”

The Harmonic Analysis Module is an indispensable tool to help engineers evaluate the harmonic level of their electrical network and to assess different mitigation methods.

It features a number of analyses such as frequency scan, voltage and current distortion calculations, capacitor rating and filter sizing analysis, and K-Factor and Factor-K calculations. The module allows the user to model non-linear loads and other sources of harmonic currents such as converters and arc furnaces and toeasily detect resonant frequencies due to capacitor banks.

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With its many modeling and analytical capabilities, the Harmonic Analysis Module makes it possible to accurately evaluate the impact of non-linear loads on the electrical network.

The module features both single phase and full threephase modeling capabilities, with the flexibility to make the program easily adaptable to utility-type grids, industrial power systems and distribution feeders of any configuration. The frequency scan capability included in this module is also available as an independent module. This analysis provides full impedance scan results and allows the user to see problematic areas even before installing harmonic devices.

harmonik analiz

Arc Flash Analysis

Risk management and protection have always been the most important phase of security planning in the electricity industry. The appropriate assessment of the Arc flash risk level helps to avoid disruptions in operational work and to create a safe working environment. Arc Flash risk analysis calculates the parameters required to assess the risk level and minimizes the risk of burns and injury to those working near electrical equipment.

arc flash

” Create a secure work environment with arc flash analysis. ”

To achieve arc flash risk calculations for industry, distribution and transmission systems, globally accepted standards and methods are used. CYME Arc Flash, NFA-70 ©, CSA Z462, IEE-1584 TM standards using the most accurate way of analysis. Arc flash analysis can be performed more easily and quickly by adding parameters such as working distance, distance between busbar distance equipment and open or closed type circuit breaker to network models created for different analyzes with CYME.

  • Single-line diagram for all systems and user-friendly interface
  • Serial mode simulation allowing analysis for all busbars in the network at once
  • Calculation of contribution times of machine and inverter based distribution units
  • Calculating the analysis according to standards or user-specific values

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  • Short circuit currents can be calculated using ANSI or conventional fault calculation methods. Taking into account the contributions of motor or generators connected to fault currents using ANSI
  • Utilizing protection-coordination analysis charts for correct opening times
  • The module automatically detects and verifies the protection elements in the network