The
Indian Electricity Grid Code (IEGC) 2006 is a regulation made by the Central
Electricity Regulatory Commission (CERC) in exercise of powers conferred under
The Electricity Act 2003. IEGC lays down the rules, guidelines and standards to
be followed by the persons and participants in the system engaged in planning,
developing and operating the Power system.
Further
regulations were made by the CERC, called Central Electricity Regulatory
Commission (IEGC) Regulations 2010, have superseded the IEGC and have come into
force from May 2010.
Some
of the definitions as mentioned in these regulations are:
1.
Ancillary services: Ancillary services are those
services necessary to support the power system operation in maintaining power
quality, reliability and security of the system or the grid. Examples are
active power support for real time load following, reactive power support,
black start etc.
2. Black Start: Black Start means the starting of a power
plant or system after a partial or total blackout in the region.
3. Available Transfer Capability
(ATC): Available
Transfer Capability is the Total Transfer Capability (TTC) minus Transmission
Reliability Margin (TRM). ATC is the transfer capability of the transmission
system, of the inter-control area, available for commercial transactions. These
transactions may be through long term access, medium term open access, and
short term open access in a specific direction considering the security aspects
of the network.
4.
Total Transfer Capability (TTC): Total Transfer Capability is
the quantity of electric power that can be transmitted reliably over the
transmission system of the inter-control area under a given set of operating
conditions considering the occurrence of the worst credible contingency.
5.
Transmission
Reliability Margin (TRM): Transmission Reliability Margin is the margin in
terms of MW kept in the Total Transfer Capability (TTC) required to ensure the
security of the interconnected transmission system under a reasonable range of
uncertainties.
6.
Bilateral Transactions: Bilateral Transaction means a transaction for
exchange of electrical energy in MWh between a given buyer and a seller from a
given point of injection to a mentioned point of drawal for a fixed or changing
quantity of power (MW) for any time period during a month. This transaction of
electrical energy may be a direct transaction or through a trading licensee or
power exchange.
7.
Unscheduled Interchange: For a generating station or a
seller, Unscheduled Interchange means the total actual generation minus its
total scheduled generation in a given time block, whereas for a buyer or a
beneficiary, it is total actual drawal minus its total scheduled drawal in the
given time block.
8.
Long Term Access: Long Term Access means the authority
to use the Inter State Transmission System (ISTS) for a period more than 12
years, but not exceeding 25 years.
9.
Medium Term Open Access: Medium Term Open Access means
the authority to use the Inter State Transmission System (ISTS) for a period
more than 3 months, but not exceeding 3 years.
10. Short
Term Open Access:
Short Term Open Access means the authority to use the Inter State Transmission System
(ISTS) for a period upto 1 month at one time.
11. Inter
State Transmission System (ISTS):
Inter State Transmission System means any transmission system for the
conveyance of electricity from one state to another, across the territory of an
intervening state as well as within the state, built, owned, operated and
controlled by Central Transmission Utility (CTU), i.e. Power Grid Corporation
of India.
12. Control
Area: Control
area is an electrical system bounded by interconnecting Tie lines, metering and
telemetry system which controls its generation and or load to maintain its
scheduled interchange with other area and helps to regulate the frequency of a
synchronously operating power system.
13. Congestion: Congestion is a case where the
demand for transmission capacity exceeds the Available Transfer Capability.
14. Demand: Demand means the demand for
active power in MW and reactive power in MVAr.
15. Load: Load is the MW/MWh/MVA/MVAh
consumed by a utility or installation.
16. Ex-power
plant: Ex-power
plant means the net active power output in MW and energy output in MWh of a
generating station after deducting the auxiliary consumption of the power plant
and the transformation losses.
17. Despatch
Schedule:
Despatch Schedule is the net MW and MWh
output of a generating station or power plant (ex-power plant) scheduled to be
injected to the grid from time to time.
18. Spinning
Reserve: Spinning
Reserve means partly loaded generating capacity with some reserve margin that
is synchronized to the rest of the system and is ready to provide increased
generation at short notice pursuant to despatch instructions by the system
operator or instantly in case of frequency collapse.
19. Independent
Power Producer (IPP):
Independent Power Producer is a generating company not owned or controlled by
the Government (Central or State Government).
20. Forced
Outage: Forced
Outage means an outage of a generating unit or a transmission facility due to a
fault or any other reasons apart from planned shutdown.
21. Connection
Point: Connection Point is a point where a plant and or electrical
apparatus connect to a transmission or distribution system.
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