Comparison project
All insulated pipeline bus
Copper bus bar
Load flow
Load flow is large (up to 12000A)
Smaller
Skin effect
Low (AC resistance is small, the KF coefficient is less than 1)
High (AC resistance)
Conductor temperature rise
Wen Shengdi
The effect of skin effect, Wen Shenggao
Junction temperature rise
Seamless connection is firm, the contact surface large, connecting parts of temperature rise below the conductor temperature rise.
Load flow effect, generally use double, multi-layer induced joints, skin effect increases, fever, Wen Sheng than the conductor temperature rise.
Heat dissipation capability
Pipe base end left mouth breathing, tube inside and outside pressure is not the same, can produce natural air convection, heat dissipation is good.
Poor cooling conditions, serious fever
Allowable span
Effective security span of up to 4.5 meters
Span ≤ 2 meters
Electric power
Anti short circuit current up to 160KA
The tolerance of short circuit current, bushing and post insulator, a burst phenomenon.
Insulation mode
Composite insulation shielding
Pillar insulator air insulation
The insulation performance
Strong (the highest by power frequency withstand voltage. 105kv/1min)
Weak (by power frequency withstand voltage 42kv/min)
Surface potential
Multilayer insulation shielding, the surface potential is zero, no harm to the safety of people's life.
The surface potential is high, do not pay attention to the case, will endanger the lives and safety equipment.
Installation
Simple structure, convenient installation.
The span, curved, insulation effect, complex structure, complicated installation, time-consuming.
Pollution flashover
Higher than the highest standards of the country, anti fouling distance is larger than 800mm/10KV, non pollution flashover.
Three levels of anti fouling distance is 230mm/10KV, post insulator pollution flashover phenomena are.
Busbar protection
Lifelong maintenance
First, each year as: blackout manual cleaning wall bushing and post insulator.
Service life
More than 20 years
More than 10 years
Comprehensive cost
Energy saving, maintenance free, small occupied space, long service life, low cost.
Great energy loss, annual maintenance, large space occupation, short service life, high cost.