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A gate turn-off thyristor (GTO) is three terminal semiconductor device – made up of four layers of alternating P-type and N-type material. Just like a conventional thyristor, it is also a current controlled, minority carrier device. The gate turn-off thyristor was invented with the purpose to address the difficulties in the turn OFF mechanism of … Read more
Hundreds are electrical motors are used in modern-day industries for process automation and control. To control those motors, motor control centers or MCC panels are needed. They contain circuit breakers and motor starters to start, stop and run motors effectively. In this article let us discuss the structure types and features of motor control centers … Read more
It is vital to maintain good ground in a system. In order to ensure that, ground resistance measurements and tests are conducted on existing earth electrodes at periodic intervals after their installation. This ensures the resistance in the ground is at an acceptable level and is maintained. Here are the different methods of ground/ earth … Read more
The fall of potential method or 3-point method is the most commonly used method to measure ground resistance. It is used to determine the earth resistance of an existing grounding system. The fall of potential method requires only a minimum amount of calculation and is best suited for small installations. It can be used for … Read more
One of the key elements affecting ground resistance is soil resistivity. Soil resistivity measurements are conducted before setting up an earthing system, in order to ensure an effective earthing. Good soil models are the basis of all grounding designs and they are developed from accurate soil resistivity testing. The ground/earth resistance measurements are conducted to … Read more
Humidifiers are used to increase the humidity in a confined space. They can be used to humidify living rooms and ventilators can be used to treat dryness. A typical household humidifier consumes a power of 25Watts. The energy usage of humidifiers can be calculated below: Enter the wattage, hours of usage, and cost per kWh. … Read more
A typical household exhaust fan consumes 40 watts of power. The energy usage of an exhaust fan purely depends on how many hours they spin. The energy usage of exhaust fans can be calculated here. Enter the wattage, hours of usage, and cost per kWh. The energy usage calculator for fans gives you the total … Read more
Grounding transformers are used to obtain a neutral when an existing delta-connected or ungrounded systems are to be grounded. These transformers provide a path for the flow of fault currents during unbalanced ground faults. They can be found in transformer substations where neutral might not be available as the transformer windings are delta connected. Types … Read more
Time-delay fuses can provide overload and short circuit protection while overcoming momentary current spikes. They are used for the protection of motors and transformers. The time-delay characteristics of these fuses typically allow them to be sized closer to the running rated full load current of the loads. Time-delay fuses are also known as slow-blown fuses … Read more
Below is the list of the most important interview questions on Modbus: 1. What is Modbus and how does it work? Modbus is an application protocol that defines rules for organizing and interpreting data and is essentially a messaging structure that is independent of the underlying physical layer. It is an open-source protocol and is … Read more
