Contact connections of prefabricated and connecting busbars, wires and lightning protection cables

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Encyclopedia of radio electronics and electrical engineering / Electrician

Annex 3. Standards for testing electrical equipment and apparatus for electrical installations of consumers

Contact connections of prefabricated and connecting busbars, wires and lightning protection cables

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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K, M - are produced within the time limits established by the system of preventive maintenance (hereinafter - PPR).

Name of the test	Type of test	Test norms	Directions
1.1. Control of pressed contact connections		Geometric dimensions and condition of contact connections are controlled. The geometric dimensions (length and diameter of the pressed part of the clamp body) must comply with the requirements of the instructions for mounting the clamps. The surface of the clamp must be free of cracks, corrosion, and mechanical damage.	The steel core of the pressed connecting clamp must not be displaced relative to the symmetrical position by more than 15% of the length of the pressed part of the clamp
1.2. Control of contact connections made using oval connecting clamps	К	The geometrical dimensions of the clamps must not differ from those specified in the instructions for mounting the clamps. The clamp surface must be free of cracks, corrosion (on steel connecting clamps), mechanical damage	The number of turns of twisting of twisted clamps on steel-aluminum, aluminum and copper wires must be at least 4 and not more than 4,5; and clamps of the type SOAS-95-3 when connecting wires AZhS 70/39 - from 5 to 5,5 turns
1.3. Control of bolted contact connections:
1) control of the tightening of bolts of contact connections	К	The tightening of the bolts of contact connections made using connecting slip, loop transition, connecting transition, branch, hardware clamps is checked	The check is carried out in accordance with the instructions for mounting the clamp.
2) measurement of transient resistances	М	On overhead lines, the resistance of a section of wire with a connector should not be more than 2 times the resistance of a section of wire of the same length	The transient resistance of uninsulated wires of overhead lines with a voltage of 35 kV and above, tires and conductors of switchgears for a current of 1000 A and more is measured
		At substations, the resistance of the contact connection should not exceed the resistance of the section (wire, bus) of the same length as the connector by more than 1,2 times	Frequency of control - 1 time in 6 years
			With positive results of thermal imaging control, measurements of transient resistances are not carried out
1.4. Control of welded contact joints:
1) control of contact connections made using thermite cartridges	К	In welded joints made using thermite cartridges, there should be no burns of the outer layer of the wire or welding disturbances when the welded ends of the wire are bent; shrinkage cavities in the place of welding with a depth of more than 1/3 of the diameter of a wire made of aluminum, its alloys or copper, with a depth of more than 6 mm for steel-aluminum wires with a cross section of 150 - 600 mm²	-
2) control of contact connections of prefabricated and connecting busbars made by welding	К	The welded joint should not have cracks, burns, craters, lack of penetration of the weld more than 10% of its length at a depth of more than 15% of the thickness of the welded metal. The total value of lack of penetration, undercuts, gas inclusions in the seams of aluminum tires should be no more than 15% of the thickness of the metal being welded in each section under consideration	-
1.5. Thermal imaging control	М	Produced in accordance with established standards and manufacturer's instructions

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