This document discusses the four main loading capability limits of transmission lines: thermal, voltage, dielectric, and stability limits. The thermal limit depends on ambient temperature, wind conditions, conductor size and is usually the main limiting factor. Voltage limits require the transmission voltage to be maintained within a specified range, like plus/minus 5% of nominal. The dielectric limit concerns insulation and allows for some increase in normal operating voltage. Stability limits involve ensuring the power system remains stable after the loss of a single element to prevent cascading outages. FACTS technology can help utilize more of the thermal limits and improve stability.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
Introduction
Definition of FACTS system
Necessity of facts devices
Shunt connected controllers
Types of facts controllers
Shunt connected controllers
Benefits of FACTS
The concept of FACTS (Flexible AC Transmission System) refers to a family of power electronics based devices able to enhance AC system controllability and stability and to increase power transfer capability.
The design of the different schemes and configurations of FACTS devices is based on the combination of traditional power system components (such as transformers, reactors, switches, and capacitors) with power electronics elements (such as various types of transistors and thyristors).
Introduction to reactive power control in electrical powerDr.Raja R
Introduction to reactive power control in electrical power
Reactive power in transmission line :
Reactive power control
Reactive power and its importance
Apparent Power
Reactive Power
Apparent Power
Reactive Power Formula
As the fifth in a series of tutorials on the power system, Leonardo ENERGY introduces its minute lecture on voltage and frequency control, using the analogy of a metal/rubber plate to demonstrate the centralised nature of frequency control, whereas voltage control is more a local matter.
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HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
Introduction
Definition of FACTS system
Necessity of facts devices
Shunt connected controllers
Types of facts controllers
Shunt connected controllers
Benefits of FACTS
The concept of FACTS (Flexible AC Transmission System) refers to a family of power electronics based devices able to enhance AC system controllability and stability and to increase power transfer capability.
The design of the different schemes and configurations of FACTS devices is based on the combination of traditional power system components (such as transformers, reactors, switches, and capacitors) with power electronics elements (such as various types of transistors and thyristors).
Introduction to reactive power control in electrical powerDr.Raja R
Introduction to reactive power control in electrical power
Reactive power in transmission line :
Reactive power control
Reactive power and its importance
Apparent Power
Reactive Power
Apparent Power
Reactive Power Formula
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Loadability of line is defined as the extent of load which can flow through the line without exceeding the limitations. Line Loadability is expressed in percentage of Surge Impedance Loading of line. The limiting factor for line loading are: thermal limit, voltage drop limit and steady state stability.
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The insulation level of an apparatus is defined as that combination of voltage values (both power frequency and impulse) which characterize it insulation with regard to its capability of withstanding the dielectric stress
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Loading Capability Limits of Transmission Lines
1. Course: M.Tech
Subject : Flexible AC Transmission Systems
Topic : Loading Capability Limits of Transmission Lines
By A. Raja
2. Introduction:
• The loading capacity or thermal rating of short power
transmission lines and distribution networks is often based on
the maximum permissible temperature of the conductors.
• In the operation of transmission lines, the conductor
temperature should be maintained within a safety limit.
3. Loading Capability Limits:
The basic limitations on loading capability of transmission
lines are:
1. Thermal Limit
2. Voltage Limit
3. Dielectric Limit
4. Stability Limit
4. 1. Thermal Limit:
• Thermal capability of an overhead line is a function of the
ambient temperature, wind conditions, conductor size & its
cross section area and ground clearance etc.
• The main limiting factor in a transmission system is the
thermal limit.
• As the thermal limit exceeds the transmission line due to
the heat generated by the line current, sags and may be the
line contact with the trees etc.
5. Thermal Limit: Cont…
•If the system is operated close to its thermal limit, i.e. it is
being used to its maximum capacity. But the thermal limit is
hardly achieved since voltage or stability limits restrict the
capacity of a transmission system.
•Thermal limits establish the maximum amount of electrical
current that a transmission line or electrical facility can
conduct over a specified time period before it sustains
permanent damage by over heating or before it violates public
safety requirements.
6. 2. Voltage Limit:
• The transmission line voltages must be maintained within the
range of acceptable minimum and maximum limits.
• For Example, minimum voltage limits can establish the
maximum amounts of electric power that can be transferred
with out causing damage to the electric system or customer
facilities
• Voltage limits normally requires that the voltage level within
a transmission system be maintained within a specified
interval, for instance plus/minus 5% of the nominal voltage.
7. 3. Dielectric Limit:
• An insulation point of view, many lines are designed very
conservatively.
• For a given normal voltage rating, it is often possible to
increase normal operation by 10% voltage i.e. 500kv – 550kv
or even higher voltages.
• Care is needed to ensure that the dynamic and transient over
voltages are within limits.
•The FACTs technology could be used to ensure acceptable
over voltage and power flow conditions.
8. 4. Stability Limit:
•The interconnected power system shall remain stable upon loss
of any one single element without system cascading that could
result in the successive loss of additional elements.
•There are a number of stability issues that limit the
transmission capability.
These include:
i. Transient Limit
ii. Thermal Limit
iii. Steady State Limit
iv. Frequency Collapse
9. Stability Limit: cont…
v. Voltage Collapse
vi. Sub Synchronous Response etc.
•Conventional power systems do not have fast and flexible
control over the transmission networks. Their stability limits are
usually less than their thermal limits. This means that the power
transfer capabilities of existing power networks are not fully
utilized.
•But the solution to the above problem is FACTs. FACTs has
emerged to implement fast and flexible control over transmission
network.