Upload
galen
View
36
Download
0
Embed Size (px)
DESCRIPTION
Protecting & Ice Melting Westman’s Distribution Lines. Speaker Scott Whaley - EIT. Western Distribution Region. The western distribution’s head office is located in Brandon There is currently five engineers helping maintain and develop the western distribution area - PowerPoint PPT Presentation
Citation preview
SpeakerSpeakerScott Whaley - EITScott Whaley - EIT
Protecting & Ice Melting Protecting & Ice Melting Westman’s Distribution LinesWestman’s Distribution Lines
Western Distribution Region The western distribution’s head office
is located in Brandon
There is currently five engineers helping maintain and develop the western distribution area
Distribution system consists of: 4 kV (kilo volts) , 8kV, 12kV and 25kV
power lines
Sub-transmission system consists of: 33kV and 66kV power lines
Distribution Infrastructure Hydro has approximately 150 stations in Western Manitoba
Standard metal and wood sub stations New DSC stations
There are over 500 feeders in Western Manitoba to protect Length of feeders vary to being very short in urban areas and can be
quite long (20 miles) in rural locations
Distribution Infrastructure Distribution protection starts at the high side fuse/breaker at the station
transformer and includes all distribution power lines up to the customer service transformer
Station TransformerDistribution Power Lines
Customer Service
Protective Equipment Reclosers (ACR)
Automatic circuit recloser Use electronic & hydraulic
Sectionalizers Detect current pulses to trip
Fuses Expulsion fuses and current
limiting fuses
Circuit Breakers Mechanical circuit breakers
Protective Equipment FAULTED CIRCUIT INDICATERS (FCI) are installed on distribution lines
where standard protective device such as an ACR, fuse or sectionalizer can not be installed
FCIs are installed to eliminate the need to repeatedly test and energize U/G cables when there is a fault. This prevents permanent damage to the cable
Aid In troubleshooting
Equipment Coordination
Protective equipment must be properly set to allow for feeder coordination
Protective equipment provides safety and reliability to both the customer and employees and helps locate line faults
We install protective devices to prevent equipment damage
Protecting Distribution Lines
Down line Recloser
FusesRegulatorStation Recloser
Protecting Distribution Lines EXAMPLE
Protecting Distribution Lines EXAMPLE
Protecting Distribution Lines EXAMPLE
Fault current of 400 amps 50 amps ACR – 2A+2B Time for fast trip = 0.05 secs. Time for slow trip = 0.32 secs.
Fault current of 400 amps Station ACR – MT= 240 amps,
2N+2E Time for fast trip = 0.22 secs. Time for slow trip = 4.30 secs.
Protecting Distribution Lines If we issue protection coordination setting correctly we can prevent
damage to equipment
MB Hydro has implemented standards for installing, protecting and rating equipment. These standards prevent damage to our infrastructure and reduce customer outages
Standards Drawing of a 1Ø Transformer
Ice Melting Ice melting is done by purposely placing a fault on a feeder. The line
fault creates tremendous heat which melts the bonded ice.
Each ice melt done on a distribution line must be calculated differently because line impedance predetermines the fault current values
Length, conductor size, temperature and time must all be taken into account when melting
Ice Rolling Manually using ice rollers to remove built up ice on the power lines. The
process is slow and time consuming and takes at least ½ hour to do 1 mile.
Ice Prone Areas
Ice melting is incorporated into Hydro’s standards
Ice Detection System The system is built using an infrared camera to capture images of the
conductor. It calculates and notifies staff if there is ice build up on the line
The ice vision system uses an embedded computer with custom designed software to perform the ice monitoring calculations
A web based application displays information which includes: Ice build up (thickness) on the conductor Temperature Wind Speed
Ice Detection System
Manitoba HydroBack Up Control Center
(BUCC)
Manitoba Hydro Station(1 of N)
Pole Equipment (1 of N)
SBC
Camera
Weather Station
UPSrouter
DC converterHeater
Wireless / EthernetBridge
Server
One to OneWireless Link
Wireless / EthernetBridge
Manitoba HydroLAN Connection
(1 0f N)
EMS Network
Digital connection
Ice Detection Camera Every second represents 30 minutes
Thank YouQuestions Questions
and and CommentsComments
For career opportunities visit:For career opportunities visit:http://www.hydro.mb.ca/careershttp://www.hydro.mb.ca/careers