Electrical Models and Measurements
Nzou delivers expert electrical engineering services for all aspects of electrical power systems, including:
- Consulting services
- Detailed studies
- Preventative failure analysis
What we Conduct
We conduct a series of analysis and studies to determine optimal customer satisfaction.
Load flow analysis utilizes a computer model to examine normal steady state and contingency conditions in an electrical system. A power-flow solution provides voltages and equipment loading under a given set of system conditions. A series of Load flow cases can show the effects of various design alternatives or equipment outages on system operation.
Nzou uses Load flow cases to:
Examine benefits of load-tap-changing transformers
Examine benefits of power-factor correction capacitors
Select locations for power-factor correction capacitors
Set taps on fixed-tap transformers
Explore steady state performance of expansion alternatives
Determine ratings for new or upgraded circuits
Determine equipment loading
Proper application and coordination of over-current relays and other protective devices is vital in a system requiring reliable electrical service. Nzou expert engineers bring the critical experience needed for the proper application of ANSI and NEC requirements to equipment protection.
In addition to relays that respond to short circuits, low-voltage breakers, differential, directional, power, under-voltage, out-of-step, and other special protective relays often need to be set. This study will include detailed tables listing the recommended settings and discussion of any limitations.
Nzou has the following test equipment in order to determine the satisfied protection relay settings necessary.These instances allows testing of virtually any protection relay.
Six phase current and voltage secondary injection.
Single and three phase voltage secondary injection.
Single and three phase current secondary injection.
Single phase and three phase primary current injection.
Short-circuit currents represent a tremendous amount of destructive energy, which can be released through electrical systems under fault conditions. Nzou conducts baseline fault calculation studies when a facility electrical system is first designed, and also updates it when a major modification or renovation takes. Major changes would be considered a change in feed by the electric utility, a change in the primary or secondary system configuration within the facility, a change in transformer size or impedance, a change in conductor lengths or sizes, or a change in the motors that are energized by the system.
It is common practice for industrial plants with major harmonic sources to add harmonic filters to limit voltage distortion and harmonic current flows into the utility system. On existing systems, harmonic measurements are usually made to determine the extent of voltage and current distortion and are used as a base for further calculations
Nzou’s harmonic analysis will reveal:
Harmonic current paths
Amount of harmonic current flowing into the utility system
Generated harmonic voltages
Performance of filter and capacitor bank tuning options
Comparison of results against the latest IEEE 519 standard
Understanding where energy consumption and loss occurs within buildings is necessary for developing a strategy to improve energy efficiency. As an important first step towards energy conservation, energy audits work to analyze energy flow within buildings and identify opportunities to optimize performance and better manage energy expenses.
In conducting energy audits, a range of diverse information is collected and assimilated for analysis. This can include system performance data, energy usage, weather data, and information related to the building’s features and envelope.
Nzou provides a suite of industry-leading data loggers, sensors, and software for collecting and analyzing key information utilized in energy audits. Nzou industry-leading tools allow energy auditing experts to capture accurate energy and performance data for characterizing the energy profile of buildings, managing peak demand, reducing energy losses, and ensuring the efficient operation of equipment, leading to better decisions for saving energy.
Power factor improvement is a cost-effective method to meet the reactive demand of distribution system. Power-factor improvement may be warranted simply from the benefits it provides in voltage increase and reduced loading of transformers, cables, and generators.
Power Factor Studies serves as an excellent tool to evaluate power factor improvement alternatives. Our engineers can provide power flow analysis to reveal actual power factor correction, while providing analysis of potential problem areas. Excessive voltage regulation may indicate a need for including automatic voltage control equipment.
In case of equipment critical to your performance, periodic visits and site inspections may not be sufficient. Our on-line condition monitoring tools will bring to your critical assets the real-time condition assessment, predictive and alert mechanisms they deserve in order to minimize unplanned outages, and avoid major repair costs or collateral damage.
Innovative designs, turnkey provision and accelerated construction are key elements in the design of modular, integrated, portable or prefabricated construction solutions to be able to provide an optimized and tailored assembly for specific applications and project requirements. Our Modular and non-modular electrical substations for all operations include modular pump stations, MV and LV sub stations, breaker skids as well PV boxes for processing energy generated in photovoltaic applications. Our experienced specialists can help you define an efficient and cost-effective space in line with the need for improved efficiency of processes and operations.