Fault locating system
Viet Nam Electricity (EVN) is the only state-owned utility responsible for generation, transmision, and distribution to end-Users. National Power Transmission Corporation (EVN-NPT) belongs to EVN and is responsible for transmission grid operation.
Viet Nam Transmission Grid consists of 500kV and 220kV Lines and Substations, including:
- 7183 km of 500kV Lines (2015)
- 15079 km of 220kV Lines (2015)
Transmissions over’ head lines with hundreds of kilometer going through mountains and forests of rugged terrains are very complicated for operation management and line patrol.
Vietnam is located in an area with very complex weather of floods, thunderstorms and tropical typhoon, which causes the huge possibility for transmission line incidents.
In most cases, electrical faults manifest in mechanical damage, which must be repaired before returning the line to service. The restoration can be expedited if the location of the fault is either known or can be estimated with reasonable accuracy.
Fault locating system help identify those locations for early repairs to prevent recurrence, consequent major damages and restore services quickly.
AFL (Automatic Fault Location) is a TW-based (Traveling Waves based) and Impedance-based distance to fault locating Software Package developed by Applied Technical Systems Company Ltd (ATS).
The main features and data flows are described in Figure 1 below. AFL is developed with standard-based features so it is a hardware-vendor independent software that will protect the utility investment and lower total cost of ownership in life cycle of the project.
The TW (Traveling Waves) and Disturbance Impedance files recorded by SEL411L (SEL-USA) or other manufactures are sent from DAU Devices to the Data Acquisition Server through private WAN.
Operators are able to set up the fault location calculation in automatic or manual mode.
The system sizing fully meets the demanding specification of clients:
- Number of substations: ≥ 500 substations
- Number of lines: ≥2000 lines
- Number of stored records of travelling wave and disturbance event: ≥2,000,000 records
|Title:||Centralized fault locating system in Vietnam’s electricity transmission grid – ATS – Applied Technical Systems Company Ltd., Hanoi, Vietnam|
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