Notes On Installation Of Busbar Wall Bushing

Insulation Piercing Connector is also called through-wall pipe, waterproof casing, wall embedded pipe, waterproof casing is divided into rigid waterproof casing and flexible waterproof casing. The two are mainly used in different places. Flexible waterproof casing is mainly used in places with high requirements such as civil defense walls and pools, and rigid waterproof casing is generally used in basements and other places where pipes need to pass through pipes.

Flexible through-wall waterproof casing is a hardware pipe fitting suitable for structures where pipes pass through walls and are subject to vibration or have strict waterproof requirements. Generally, manufacturers manufacture it according to the S312, 02S404 standard drawings developed and designed by the Institute of Building Science. If the wall where the flexible through-wall waterproof casing passes through the wall is not concrete, it should be replaced with a concrete wall, and the casing must be solidified in the wall at one time; flexible through-wall waterproof casing is widely used in construction, chemical, steel, tap water, sewage treatment and other units.

The rigid wall-penetrating waterproof casing is a steel pipe with an external wing ring (a ring made of steel plate is sleeved on the steel pipe), which is installed in the wall (mostly concrete wall) and is used for general pipes to pass through the wall, which is beneficial to the waterproofing of the wall. In addition to the external wing ring, the flexible wall-penetrating waterproof casing also has internal retaining rings and internal threads of flanges. It is sold as a set or can be processed by yourself. It is used for pipelines that require shock absorption, such as pipes connected to water pumps passing through the wall.

Whether it is a flexible wall-penetrating waterproof casing or a rigid wall-penetrating waterproof casing, they are hardware accessories used for pipes to pass through the walls of buildings that are subject to vibration or have strict waterproofing requirements. They are often used in construction, chemical, steel, tap water, sewage treatment and other units.

Conditions of use

(1) Indoor installation

(2) Altitude not exceeding 1000M

(3) Ambient temperature +40℃~5℃;

(4) When the air temperature is +20℃, the relative humidity should not exceed 85%

(5) There is no place with gas, steam, dust and other explosive and corrosive media that seriously affect the insulation of the contact box.

Installation of bus duct insulators and wall bushings

Insulators and wall bushings should be inspected before installation. The porcelain parts and flanges should be intact and free of cracks, and the fillings at the glued parts should be complete and firmly combined.

Before installation, insulators and wall bushings should be tested and qualified in accordance with the provisions of the current national standard "Electrical Equipment Handover Test Standard for Electrical Installation Engineering". The top surfaces of the post insulators or wall bushings installed on the same plane or vertical plane should be located on the same plane, and their center line position springs should meet the design requirements. The installation center lines of the post insulators of the straight section of the bus should be on the same straight line.

When installing the post insulator and the wall bushing, its base or flange shall not be buried in the concrete or plaster layer. When the post insulator is stacked, the center line should be consistent. The fixation should be firm and the fasteners should be complete.

The installation of triangular cone combined post insulators shall comply with the relevant provisions of this specification and the technical requirements of the product.

The contact surface between the low-voltage post insulator with internal glue without base and top cap and the metal fixing should be padded with a rubber or asbestos paper cushioning gasket with a thickness of not less than 150mm.

The installation of the suspension insulator string shall meet the following requirements:

1. Except for design reasons, the suspension insulator string should be perpendicular to the ground. When the conditions cannot meet the requirements, it can have an inclination angle of no more than 5. 2. When multiple strings of insulators are connected in parallel, the tension of each string should be uniform.

3. When the insulator string is assembled, the bolts, pins and locking pins of the connecting box must comply with the current national standards and should be complete. The direction of penetration should be consistent. The bowl H of the tension insulator string should be upward, and the ball head hanging ring, bowl head hanging plate and locking pin of the insulator string should match each other. 4. The spring pin should have sufficient elasticity, the closed pin must be separated, and there should be no breakage or cracks. It is strictly forbidden to replace it with wire. 5. The protective hardware such as the equalizing ring and the shielding ring should be installed firmly and the position should be correct. 6. The insulator string should be cleaned before hoisting.

The installation of the wall bushing should meet the following requirements:

1. The aperture of the wall bushing should be larger than the embedded part by more than 5mm, and the maximum thickness of the concrete mounting plate shall not exceed 50mm. 2. When the wall bushing with a rated current of 1500A or above is directly fixed on the steel plate, the bushing should not form a closed magnetic circuit around it. 3. When the wall bushing is installed vertically, the flange should be upward, and when it is installed horizontally, the flange should be outside.

4. The metal clamping plate (except fasteners) at the end of the busbar wall bushing of 600A and above should be made of non-magnetic material, and there should be metal connection between it and the busbar, and the contact should be stable. The thickness of the metal clamping plate should not be less than 3rnm. When the busbar is two or more pieces, the busbars themselves should be fixed.

5. When the oil-filled bushing is installed horizontally, its oil storage cabinet and oil sampling pipeline should be leak-free, the oil level indication should be clear, and the oil filling and sampling valve positions should be installed on the patrol monitoring side. The oil injected into the bushing must be qualified.

6. The bushing grounding terminal and the unused voltage extraction terminal should be reliably grounded.