- capacitor bank
- current transformer
- circuit breaker
- lightning arrester
Answer: 4. lightning arrester
Explanation:
What is Lightning Arrester?
A lightning arrester is a device that is used to protect electrical equipment from damage caused by high-voltage transient surges or lightning strikes. Lightning strikes can cause massive electrical surges that can damage or destroy electrical equipment, and lightning arresters are designed to divert these surges safely to the ground.
Lightning arresters are designed to protect equipment at substations against traveling waves. Traveling waves are high-frequency electrical disturbances that can propagate along power lines, and they can cause significant damage to electrical equipment if they are not properly controlled. Lightning arresters are designed to absorb these waves and divert them safely to the ground, thereby protecting the equipment.
In the event of a lightning strike or other high-voltage transient surge, a lightning arrester diverts the abnormally high voltage safely to the ground. This prevents the surge from damaging or destroying the equipment, while also ensuring that the continuity of supply is not affected. Lightning arresters are typically installed in parallel with the equipment to be protected, and they are connected between the line and earth.
Lightning arresters are typically connected near the transformer at the substation. This is because transformers are one of the most expensive and critical pieces of equipment in the substation, and they are particularly vulnerable to damage from lightning strikes and other high-voltage surges. By installing lightning arresters near the transformer, the equipment can be protected from these surges and ensure that the substation continues to operate safely and reliably.
Types of Lightning Arrester:
What is Rod gap arrester?
The basic design of a rod gap arrester consists of two metal rods separated by a small air gap. One end of the arrester is connected to the line, which carries the electrical power, while the other end is connected to the ground. The air gap provides a path of low resistance for the high voltage surge to pass through, diverting it away from the equipment and dissipating the energy harmlessly into the ground.
The rod gap arrester works on the principle of the spark gap. When a high voltage surge occurs, it ionizes the air in the gap, creating a conductive path for the surge to follow. This allows the surge to be safely directed away from the equipment and into the ground.
What is Horn Gap Arrester?
A horn gap arrester is a type of lightning arrester that protects electrical equipment and transmission lines from high voltage surges, including those caused by lightning strikes. The arrester consists of two horn-shaped metal pieces separated by a small air gap, which are connected in a shunt between each conductor and earth.
The distance between the two electrodes, or horns, is set such that normal voltage between the line and earth is insufficient to jump the gap. This means that during normal operating conditions, the arrester remains in a non-conducting state and does not affect the flow of electrical current through the system.
However, when an abnormal high voltage surge occurs, such as a lightning strike, the voltage between the line and earth increases beyond the normal operating range, and the gap between the horns breaks down. This creates a conductive path for the surge to follow, which diverts it away from the equipment and into the ground, protecting the equipment from damage.
The horns on the arrester provide a sharp point, which helps to ionize the air and create a conductive path for the surge to follow. This allows the surge to be safely directed away from the equipment and into the ground.
Power System MCQs With Explanation
The advantages of high transmission voltage are
The charging current drawn by the cable is
The fact that current density is higher at the surface when compared to the center is known as
In which of the following transmission lines capacitance effect is negligible?
The distribution constant of the transmission line is
Proximity effect is more in case of
If the frequency is increased, then the skin effect will
Bundled conductors in EHV transmission lines help in
Which of the following produces radio interference in communication lines?
Telecommunication lines are transposed to reduce the
What is the function of economizer in Thermal Power Plant
Which of the following effects are associated with transmission line
The insulator thickness on the conductor, in cables, depends upon
By using a guard ring in a transmission line, its string efficiency
If sag in an overhead line increase, the tension in the line
Corona is accompanied by
The conductor carries more current on the surface as compared to the core. This is called as
Critical disruptive voltage is a voltage at which
Bundled conductors are used for EHV transmission lines primarily for reducing the
Low power factor is usually not due to
Bonding is done at both ends of the cable to reduce the
For Improving power factor
Stock bridge dampers are used to
Which of the following insulator is practically used for railway crossings?
Which of the following decides the insulation level of 400 kV, EHV line?
When earth fault occurs
The minimum length of pipe electrode used for earthing should not be less than
A ground wire is used to
Earth resistance in typical domestic wiring is
By which of the following systems electric power may be transmitted?
Which of the following equipment will be most economical for regulating the voltage in the distribution feeder?
Transformer MCQs With Explanation
In a transformer the primary flux is
The noise of the transformer is mainly due to
Buchholz relay is used for the protection
Iron loss in a transformer can be determined by
Oil is provided in an oil-filled transformer for
In a star-delta transformer, the delta side phase voltage leads the star sides phase voltage by an angle
Minimum voltage regulation occurs in transformer when the power factor of the load is
The chemical used in the breather of a transformer should have the property of
The power transformer can be termed as a constant
In a transformer, which of the following losses are zero?
Which of the following Transformer can have a tap changer?
If the supply frequency (f) of a transformer decreases, the effect of frequency on the transformer's secondary output voltage?
The primary winding of a transformer has a 120 V ac supply. What is the value of secondary voltage if the turn ratio is 10?
The efficiency of a power transformer is _____ at full load.
In a transformer the relation between the input frequency and the output voltage on secondary winding is _____.
In a current transformer, _____ winding is closed.
A transformer is a _____ device.
A step-down transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
A step-up transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
Transformer works on ______ principle.
Shell Type Transformer is mainly used for
A Magnetic Oil level Guage (MOG) is used in the Transformer to
The Function Of Power Transformer is/are
The Radiators are used in transformers for
The noise of the transformer is mainly due to
Buchholz relay is used for the protection
Iron loss in a transformer can be determined by
Oil is provided in an oil-filled transformer for
In a star-delta transformer, the delta side phase voltage leads the star sides phase voltage by an angle
Minimum voltage regulation occurs in transformer when the power factor of the load is
The chemical used in the breather of a transformer should have the property of
The power transformer can be termed as a constant
In a transformer, which of the following losses are zero?
Which of the following Transformer can have a tap changer?
If the supply frequency (f) of a transformer decreases, the effect of frequency on the transformer's secondary output voltage?
The primary winding of a transformer has a 120 V ac supply. What is the value of secondary voltage if the turn ratio is 10?
The efficiency of a power transformer is _____ at full load.
In a transformer the relation between the input frequency and the output voltage on secondary winding is _____.
In a current transformer, _____ winding is closed.
A transformer is a _____ device.
A step-down transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
A step-up transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
Transformer works on ______ principle.
Shell Type Transformer is mainly used for
A Magnetic Oil level Guage (MOG) is used in the Transformer to
The Function Of Power Transformer is/are
The Radiators are used in transformers for
Synchronous Motor MCQs With Explanation
In 3 -Φ synchronous motor if one of the phases is short-circuited the motor will
The speed regulation of a synchronous motor is
The negative phase sequence in a three-phase synchronous motor exists when the motor is
What happens if the field winding of the synchronous motor is short-circuited?
For power factor correction, synchronous motors operate at
The speed regulation of a synchronous motor is
The negative phase sequence in a three-phase synchronous motor exists when the motor is
What happens if the field winding of the synchronous motor is short-circuited?
For power factor correction, synchronous motors operate at
Induction Motor MCQs With Explanation
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