Tenaga Nasional Berhad

Protection
Protection Apparatus
Protection System
Prudent Utility Practices
Reactive Energy
Reactive Power
Reliability
Security
Security of Supply
Single Contingency
Substation
The provisions for detecting abnormal conditions on a system and initiating
fault clearance or actuating signals or indications.
A group of one or more protection relays and/or logic elements designated
to perform a specified protection function.
A system, which includes equipment, used to protect facilities from damage
due to an electrical or mechanical fault or due to certain conditions of the
power system.
With respect to the distributor, means the exercise of that degree of skills,
diligence, prudence and foresight consistent with Electricity Supply Act
1990 and the Regulations, condition of Licence, standards, the Code and
the distributor owned standards and practices.
A measure, in varhours (varh) of the alternating exchange of stored energy
in inductors and capacitors, which is the time-integral of the product of
voltage and the out-of-phase component of current flow across a connection
point.
The product of voltage and current and the sine of the phase angle between
them measured in units of volt amperes reactive. The rate at which reactive
energy is transferred.
In the context of a distribution system is a measure of availability of
Adequate and secure supply to the consumers
Means security Supply.
The ability of the distribution system restore supply to consumers following
momentary or temporary interruptions.
In respect of a transmission or distribution network, a sequence of related
Events which result in the removal from service of one transmission or
distribution line, or transformer. The sequence of Events may include the
application and clearance of a fault of defined severity.
A facility at which two or more lines are switched for operational purposes.
May include one or more transformers so that some connected lines operate
at different nominal voltages to others.
TENAGA
NASIONAL B E R H A D
67