Nomal Type Suspension Insulators
01
70KN U70B Disc Suspension Porcelain Insulator
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product description
IEC Standard: U70B
Nominal Diameter: Typically 255mm
Spacing (Dry Arcing Distance): Typically 146mm
Mechanical Strength (M&E Rating - Combined Mechanical & Electrical): This is the defining difference. The U70N corresponds to a 70KN M&E strength rating.
Leakage Distance: Typically around 305mm
Electrical Ratings (Typical Values):Flashover performance is primarily dictated by these factors, not the mechanical rating.
Low-Frequency Dry Flashover Voltage: 80 kV
Low-Frequency Wet Flashover Voltage: 50 kV
Critical Impulse Flashover Voltage (Positive): 125 kV
Critical Impulse Flashover Voltage (Negative): 130 kV
Application
Used in suspension and dead-end strings on medium and high-voltage AC and DC transmission and distribution lines.
Multiple units are connected in series to achieve the required insulation level for the system voltage and environmental conditions.
Crucially, 70KN U70B Disc Suspension Porcelain Insulator are selected over U40B units in locations where higher mechanical loads are expected. This includes:
1.Lines with heavier conductors.
2.Longer spans between towers.
3.Areas with high wind or ice loading potential.
4.Dead-end points and angle structures where conductor tension is highest.
specification
| Ball and socket type suspension porcelain insulators( IEC Class ) | ||
| Type | XP-70 | |
| IEC Class | U70B | |
| Coupling size | 16 | |
| Dimensions | ||
| Diameter(D) | mm | 255 |
| Spacing(H) | mm | 146 |
| Leakage distance | mm | 320 |
| Mechanical Values | ||
| Combined M&E strength | kn | 70 |
| Impact strength | N.m | 6 |
| Routine proof test load | kn | 35 |
| Electrical Values | ||
| power frequency dry withstand voltage | kv | 70 |
| power frequency wet withstand voltage | kv | 40 |
| Dry lightning impulse withstand voltage | kv | 100 |
| Power frequency puncture voltage | kv | 110 |
| Radio influence Voltage Data | ||
| Test voltage RMS to ground | kv | 10 |
| Maximum RIV at 1000kHz | μv | 50 |
| Packing and Shipping Data | ||
| Net weight,approximate | kg | 4.7 |
