Serial in Parallel Out (SIPO) Shift Register
Why is Fluorescent Lamp Phosphor Coated?
Construction of Fluorescent Lamp
History of Fluorescent Lamp
Serial In Serial Out (SISO) Shift Register
Corona Effect in Power System
Ferranti Effect in Power System
Skin Effect in Transmission Lines
Inductance of Two Wire Single Phase Transmission Line
Advantages of Three Phase System over Single Phase System
Inductance in Single Conductor Power Transmission Line
Inductance in Three Phase Transmission Line
Why Supply Frequency 50 or 60 Hz not Other Values than these?
Power System Stability
Load Flow or Power Flow Analysis
Transient Stability in Power System
Flexible AC Transmission Systems (FACTS)
Tariff of electricity in India
Power Factor | Calculation and Power Factor Improvement
Electrical Power Cable
Types of Overhead Conductor
Testing of Electrical Power Cable | Type Test | Acceptance Test | Routine Test
Conductor Resistance Test of Electrical Power Cables
Test for Thickness of Insulation of Power Cable
Annealing Test for Wires and Conductors
Tensile Test of Conductors
Persulphate Test of Conductor
Wrapping Test for Conductors
Capacitor Bank | Reactive Power Compensation
Types of Capacitor Bank
Specifications or Rating of Power Capacitor Bank
Location of Shunt Capacitors
Switchable Capacitor Bank or Switched Capacitor Bank
Electrical Insulator | Insulating Material | Porcelain Glass Polymer Insulator
Types of Electrical Insulator | Overhead Insulator
Insulation Coordination in Power System
Electrical Insulator Testing | Cause of Insulator failure
Electrical Power Substation Engineering and Layout
Electrical Bus System and Electrical Substation Layout
Mobile Substation | Portable Substation | Mobile Transformer
Load Curve | Load Duration Curve | Daily Load Curve
Electrical Transmission Tower Types and Design
Methods of Transmission Tower Erection
Basic Concept of Transmission Tower Foundation
Design of Foundations of Transmission Towers in different Soils
Electrical Power Transmission System and Network
Transmission Line in Power System
Voltage in Power Electric Lines
Short Transmission Line
Medium Transmission Line
Long Transmission Line
Performance of Transmission Line
ABCD Parameters of Transmission Line
Sag in Overhead Conductor
Tariff of electricity in India
Traiff of Electricity in India
Tariff refers to the amount of money the consumer has to pay for making the power available to them at their homes. Tariff system takes into account various factors to calculate the total cost of the electricity.
Before understanding tariff of electricity system in detail a slight overview of the entire power system structure and hierarchy in India would be very fruitful. The electrical power system mainly consists of generation, transmission and distribution. For generation of electrical power we have many PSUs and private owned generating stations (GS). The electrical transmission system is mainly carried out by central government body PGCIL(Power grid corporation of India limited). To facilitate this process, India is divided into 5 regions : Northern, Southern, Eastern, Western and North eastern region. Further within every state we have a SLDC (state load dispatch centre).The distribution system is carried out by many distribution companies (DISCOMS) and SEBs (State electricity board.).
Types:There are two tariff systems, one for the consumer which they pay to the DISCOMS and the other one is for the DISCOMS which they pay to the generating stations.
Let us first discuss about the tariff of electricity for the consumer i.e the cost consumer pay to the DISCOMS. The total cost levied on the consumer is divided into 3 parts usually referred as 3 part tariff system.
Total cost of electrical energy = fixed cost +semi fixed cost + variable cost = (a + b*KW +c*KW-h ) Rs.
Here a = fixed cost independent of the maximum demand and actually energy consumed. This cost takes into account the cost of land, labor, interest on capital cost, depreciation etc.
b = constant which when multiplied by maximum KW demand gives the semi fixed cost. This takes into account the size of power plant as maximum demand determines the size of power plant. c = a constant which when multiplied by by actual energy consumed KW-h gives the running cost. This takes into account the cost of fuel consumed in producing power.
Thus the total amount paid by the consumer depends on its maximum demand, actual energy consumed plus some constant sum of money.
Now electrical energy is generally expressed in terms of unit, and 1 unit = 1 KW-hr (1 kw of power consumed for 1 hr ).
IMPORTANT : All these costs are calculated on active power consumed. It is mandatory for the consumer to maintain a power factor of 0.8 or above otherwise penalty is levied on them depending on the deviation.
Let us now discuss about the tariff system existent in India for the DISCOMS. It is regulated by CERC (central electricity regulatory commission). This tariff system is called availability based tariff (ABT).
As its name suggest it is a tariff system which depends on the availability of power. It is a frequency based tariff mechanism which tends to make the power system more stable and reliable.
This tariff mechanism also has of 3 parts: Fixed charge + capacity charge + UI (Unscheduled interchange).
The fixed charge is same as that discussed above. The capacity charge is for making the power available to them and depends on the capacity of plant and the third one is UI. To understand the UI charges let us see the mechanism.
Mechanism of ABT
• The generating stations commit a day ahead about the schedule power which they can provide to the regional load dispatch centre (RLDC).
• The RLDC conveys this information to various SLDC which in turn collects the information from various state DISCOMS about the load demand from various types of consumers.
• The SLDC sends load demand to RLDC. And now RLDC allocates the power accordingly to the various states.
If every things goes well, power demand is equal to power supplied and the system is stable and frequency is 50 Hz. But practically this rarely happens. One or more state overdraws or one or more GS under supplies. This led to deviation in frequency and system stability. If demand is more than supply frequency dips from normal and vice verse.
UI charges are incentive provided or penalties imposed on the generating stations. If the frequency is less than 50 Hz, implies demand is more than supply, then the GS which supplies more power to the system than committed is given incentives. On the other hand, if frequency is above 50 Hz, implying supply is more than demand, incentives are provided to GS for backing up the generating power. Hence it tries to maintains the system stable.
Time of day: Usually during day period the demand for power is very high and the supply remains the same. Consumers are discouraged to use excess power by making the cost high. Contrary to that during night time, demand is less compared to supply and hence consumers are encouraged to use power by providing it at cheaper rate. All these are done to make/keep the power system stable.