Audio Frequency Transformer Small iron-core transformer used in the audio-frequency range of 20 to 20,000 Hz are called audio-frequency transtormers. The use of these transformers in electronic circults employed for communications, measurements and control is quite common for the purpose of coupling load to the voltage source. Primarily, the functions of audio-frequency transformers are, (1)Continue reading “Audio Frequency Transformer”
Author Archives: Arshad
Induction Regulators
Induction Regulator An induction voltage regulator enables a smooth variation of the output voltage, whereas in a tap-changer transformer, the output voltage can be controlled only in discrete steps. In induction voltage regulator, the output voltage is controlled by varying the angle between the magnetic axes of primary and secondary windings. In tap-changer, the outputContinue reading “Induction Regulators”
On Load TapChanger
On-load Tap-changer This tap-changer is used for daily or short period voltage alterations. The output voltage can be regulated with the changer, without any supply interruptions. During the operation of an on-load tap changer; (1) the main cireuit should not be opened otherwise dangerous sparking will occur and (2) no part of the tapped windingContinue reading “On Load TapChanger”
No-Load(or Off-Load)Tap Changer
No-Load (or Off-load) Tap Changer This tap changer is used for seasonal voltage variations. An elementary form of no-load tap changer is illustrated in Fig. 1.55. It has six studs marked from one to six. The winding is tapped at six points, equal to the number of studs. The tapping leads are connected to sixContinue reading “No-Load(or Off-Load)Tap Changer”
Parallel Operation of Single- Phase of Transformer
When electric power is supplied to a locality, city or an area, a single transformer, capable of handing the required power demand, is installed. In some cases, it may be preferable to install two or more transformers in parallel, instead of one large unit. Though two or more transformers may be expensive than one largeContinue reading “Parallel Operation of Single- Phase of Transformer”
V.C.B
V.C.B – Vaccum circuit breaker – Is a device that, interrupts an electric circuit to prevent un-wanted current, caused by a short circuit, typically resulting from an overload.
Features of Rotating Electrical machines
Features of Electrical rotating machines All the rotating electrical machines, used for generation purposes, electric drives or for control systems, have many common essential features from the construction point of view. For example, every rotating electrical machine must possess, (1) stator (stationary member) (2) rotor (rotating member) (3) air-gap separating the stator and rotor andContinue reading “Features of Rotating Electrical machines”
What is the Maximum Transmission Voltage in India?
Maximum A.C Transmission Voltage in india is 750KV a.c Maximum D.C Transmission Voltage in india is 600KV D.C
Busbar
Busbar – A Busbar is a metallic strip or bar (typically copper, brass or aluminium) that conducts electricity within a switchboard, distribution board, substation, battery bank, or other electrical apparatus.
V.F.D
V.F.D – Variable Frequency Drive It is used to control speed of a.c induction motors ( single phase or three phase ) without affecting the electric consumption, torque, impedandce, magnetic flux etc.
Electricalmode 