How to Perform Power System Analysis for Load Flow, Short Circuit and Relay Coordination for a Company in New Zealand?

How to Perform Power System Study and Analysis for Load Flow, Short Circuit and Relay Coordination for a Company

The reliability, safety, and efficiency of an electrical power system depend on understanding its power flow, short circuit fault currents that may be present in the system, and understanding the interrupting capability of protective devices.

Care Labs performs a variety of power system analyses, including load flow analysis, short circuit and fault analysis, protective device coordination study, arc flash study, harmonic analysis, dynamic and transient analysis, earthing study, in addition to documentation updates.

Power system study & analysis is designed to improve performance of power system and reliability, maximize power quality, protective system coordination, and increase working personnel safety.

The power systems analysis experts at Care Labs enable efficient, economical use of power by using field measurements and software modeling to analyze power systems.

Our extensive industrial experience, in combination with the industry’s most popular electrical engineering software – ETAP, produces electrical documentation of the highest quality and enables us to provide power system studies you can place complete confidence in.

Load Flow Study in New Zealand:

In designing the entire electrical system infrastructure, conducting a load flow analysis by a professional will ensure that industrial operations are not disrupted, supports a continuous system power flow.

Load flow studies are fundamental tools in any power system analysis study. Studies calculations are used in planning and design studies to reveal whether a particular element in a system is at risk for overloading or not.

These studies determine the performance of the electrical system during normal and emergency operating conditions provides information needed to

  • Optimize circuit usage,
  • Develop voltage profiles,
  • Minimize real (kW) and reactive (kVar) power losses,
  • Develop equipment guidelines,
  • Identify transformer tap settings.

Short Circuit Study in New Zealand:

If improperly protected, short circuit currents can be injuries or even fatal to working personnel, and it could damage or deteriorate equipment. It introduces destructive energy in the forms of heat and magnetic force into a system.

A short circuit analysis study is used to determine the short circuit current magnitude and compares it with the standard interrupting rating of the protective device.

Short circuit analysis provides recommended solutions, identifies problem areas in the system, evaluates the application of protective devices and equipment, reduces the risk a facility could face, and help avoid catastrophic losses.

Most electrical power systems are not planned with coordination of protective device kept in mind. An electrical power system can be designed with minimum investment and losses. But still fail in the proper protective device coordination.

Failure occurs within protective devices like relay are usually a short circuit fault, and it can easily result in the shutdown of the entire facility. It would be desirable that the failure of these devices would affect only that portion of the system.  

A coordination study deals with the setting or selection of protective devices from the load upstream to the entire system.

In selecting or setting these protective devices, the operating times of the protective devices are compared with respect to various over current levels. The main objective is to design selective coordination in the electrical system.

This study determines the operation capability of equipment without damage or failure by comparing the operating levels and times of protective devices to the withstanding capacities. 

Additionally, the adequate interrupting ratings of protective devices are checked in coordination studies. Inadequate interrupting ratings can lead to either extensive damage faults & system operation or may cause hazards to operating personnel.

Care Labs Methodology:

  • Data collection
  • Study and analysis
  • Report of findings
  • Updating findings

Data Collection

To determine the appropriate types, ratings, and device settings, our technical services team will review an updated single-line diagram of the electrical system. If relevant data is not available, then the engineer will collect these data to perform the study.

Power system analysis study

Once data is collected on the distribution system, Care Labs then utilizes power systems software ETAP to assist with analysis. The computer modeling of power system helps our technicians to determine optimum settings for all devices, ensuring appropriate coordination.

Report of Findings

Our comprehensive computer-aided analysis and the findings report is carefully documented in both electronic and paper report format.

Updating findings

Also included with the report is an updated single-line diagram illustrating devices, equipment, system information, and short circuit levels. It supports future system services for performance optimization and safety enhancement and is essential for ensuring your facility systems are compliant with regulations

Care Labs offers its services across New Zealand including Auckland, Wellington, Canterbury, Waikato, Bay of Plenty, and Otago. Connect with us and allow us to design an effective solution to all your needs and requirements.

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