Compute derating factor - Simulink (2024)

FAQs

What is the function of derating? ›

Description. The Derating Function block generates the derating factor ( y ) according to the feedback ( f_feedback ) and maximum limit ( f_max ) values of the input reference signal. The derating factor: Remains equal to one when f_feedback lies between positive and negative values of the Derating threshold.

In electronics, derating is the operation of a device at less than its rated maximum capability to prolong its life. Typical examples include operations below the maximum power rating, current rating, or voltage rating.

Derating means the reduction of the output power depending on the ambient conditions. Derating is therefore a recommended protective measure for electronic components and devices to protect them from high temperatures and prevent failures. The power reduction is precisely specified for each power supply.

The derating factor is defined as the scaling of the output power of the solar panel to consider the wire losses, losses due to dust particles, increased temperature, or any other thing that deviates the output power of the solar panel from the expected value. From: Fundamentals of Smart Grid Systems, 2023.

Derating involves running the system or component at a lower voltage or current and therefore less heat being generated. And can be applied to almost all the electronic components including resistors, diodes, transistors, thyristors, LEDs ICs, CPUs capacitors and others.

Derating factor (DRF) = 1 – string efficiency. If DRF more then no. of SCRs will more, so string is more reliable. Let the rated blocking voltage of the string of a series connected SCR is 2V1 as shown in the figure below, But in the string two SCRs are supplied a maximum voltage of V1+V2.

As the ambient temperature increases beyond designed operating conditions, engine derating begins, decreasing its efficiency. For example, if an engine is designed to operate at 30°C, and the ambient temperature reaches 40°C, the engines can experience a reduction in power by as much as 5-10%.

Electrical stress de-rating analysis is the process of determining a part's ability to withstand induced stresses under given environmental conditions. Induced stresses are taken from the datasheet and circuit analysis, and are identified in terms of voltage, current, power, etc.

Derating factors are applied in various sections of the ASME B31 series of codes to account for specific conditions that may affect the performance of materials, components, or systems. Derating is the reduction of a component's allowable stress or capacity under certain conditions.

The derating factor is applied to reduce the cable's current carrying capacity. For example, if a X-90 cable can carry 40A @90 degrees, there may be additional factors which requires the cable to be de-rated such that it carries only 30A@90 degrees in the installation.

Why do we derate conductors? ›

More current-carrying conductors in an enclosed space may result in a greater ambient temperature. The ampacity of those conductors must be derated to account for this increase in ambient heat.

De-rating is when a power system or component is operated at a level below its headline rating to meet safety, thermal & reliability requirements. Two of the most common de-rating specifications are linked to temperature and input voltage.