Manufactur standard U120b Glass Insulator - High Voltage 70kn Disc Suspension Toughened Glass Insulator U70BL – Johnson

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Manufactur standard U120b Glass Insulator - High Voltage 70kn Disc Suspension Toughened Glass Insulator U70BL – Johnson Detail:

Product Design Drawings

High Voltage 70kn Disc Suspension Toughened Glass Insulator U70BL (9)

Product Technical Parameters

IEC designation		U70B/146	U70B/127
Diameter D	mm	255	255
Height H	mm	146	127
Creepage distance L	mm	320	320
Socket coupling	mm	16	16
Mechanical failing load	kn	70	70
Mechanical routine test	kn	35	35
Wet power frequency withstand voltage	kv	40	40
Dry lightning impulse withstand voltage	kv	100	100
Impulse puncture voltage	P.U	2.8	2.8
Power frequency puncture voltage	kv	130	130
Radio influence voltage	μv	50	50
Corona visual test	kv	18/22	18/22
Power frequency electric arc voltage	ka	0.12s/20kA	0.12s/20kA
Net weight per unit	kg	3.6	3.5

Installation and maintenance

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3 Installation

3.1 Appearance Check
The insulators shall be inspected one by one according to chapter 28 of GB/ T1001.1-2003 and this standard before installation, and the use of insulators that do not meet the above requirements shall be prohibited.

3.2 Insulator resistance measurement
Insulation resistance of porcelain insulators shall be measured one by one before installation. Insulators that do not meet the requirements of DLT626 shall not be used.

3.3 Precautions
During installation, insulators should be handled with care, not thrown, and avoid collision and friction with sharp objects.

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4 Operation and Maintenance
4.1 document
The operating unit shall establish insulator files in accordance with DL/T 626.

4.2 maintenance
During inspection and inspection of insulators, if it is found that the lock pin is missing or the insulator has zero value, live operation or power failure repair shall be adopted, and the insulators shall be inspected in time according to the following provisions.
If one of the following conditions occurs, the insulator can be determined to be invalid. A) Cracks and yellow rust spots appear on the iron cap (acid reflux); B) Bending and cracking of steel feet; C) Severe arc burning of iron cap and steel foot;
D) iron cap, insulation and steel foot are not on the same axis: e) porcelain cracks occur;
F) Insulation parts are seriously burned by partial discharge and partial shedding occurs; G) Cracks or skew appear in the cement at the steel foot;
H) Corrosion of steel feet occurs as described in DLT626-2005.

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