MTel Group

12/06/2025

Automatic change over

18/03/2025

18/03/2025

Types Of Fuse

17/03/2025

17/03/2025

16/03/2025

The reason transformers are rated in kVA (kilovolt-amperes) and motors are rated in kW (kilowatts) lies in how each device handles power and the nature of the losses involved. Here’s a detailed explanation:

1. Transformer Rated in kVA:

Power Factor Independence: A transformer does not consume power on its own but rather transfers electrical power from the primary to the secondary side. The power factor (the ratio of real power to apparent power) depends on the load connected to the transformer, which can vary. Since the transformer’s operation is independent of the load's power factor, manufacturers rate transformers in terms of apparent power (kVA), which does not consider the power factor.

Losses in Transformers: The two main types of losses in a transformer are:

Copper losses (I²R losses): Dependent on the current.

Iron (core) losses: Dependent on the voltage. These losses are not directly influenced by the power factor, so transformers are rated in terms of kVA, which combines both current (amperes) and voltage (volts).

2. Motor Rated in kW:

Power Factor Consideration: Motors convert electrical energy into mechanical energy (real power), which is measured in kilowatts (kW). The kW rating specifies the amount of real power a motor can provide to carry out mechanical work. The power factor is already accounted for in motor design, so the real power rating (kW) is what matters for motors.

Energy Conversion: Motors are primarily concerned with the real power (kW) they can generate for mechanical work. The electrical energy converted into useful work is reflected in the kW rating, which represents the power consumed and converted into mechanical motion.

Key Difference:

kVA (apparent power) in transformers represents the combination of real power and reactive power, without assuming a specific power factor.

kW (real power) in motors reflects the actual power used to do useful work, where the power factor is inherently part of the motor's efficiency.

Thus, transformers are rated in kVA because their performance is independent of the load's power factor, while motors are rated in kW because they are designed to deliver a specific amount of mechanical work.

16/03/2025

What is the Difference between Earthing and Grounding?
Earthing:
Earthing can simply be defined as the process of protecting against unwarranted spikes and bouts of electricity that can cause damage to life and property. Therefore it is important to remember these key differences between the two. One needs to understand that they both are referring to the same process.
Grounding:
Grounding is similar to Earthing, which achieves insulation against accidental currents. The main live wire is connected to a power supply to power an appliance. However, the other portion of the wire is led under the earth. This is done in case of an accidental cut in the circuit to avoid overloading and other dangerous side effects.

The key difference between earthing and grounding is that the term “Earthing” means that the circuit is physically connected to the ground, which is Zero Volt Potential to the Ground (Earth). Whereas in “Grounding”, the circuit is not physically connected to the ground, but its potential is zero with respect to other points.

13/03/2025

Speaker Audio function
Color now night vision
Smartphone app

Call/Whatsapp for order!!

02/03/2025