Norms of acceptance tests. Busbars and connecting busbars

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Norms of acceptance tests. Busbars and connecting busbars

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.27. Tires are tested in the scope:

for voltage up to 1 kV - according to claims 1, 3-5;
for voltages above 1 kV - according to paragraphs 2-6.

1. Measurement of the insulation resistance of suspension and support porcelain insulators.

Produced with a megohmmeter for a voltage of 2,5 kV only at positive ambient temperatures.

The resistance of each insulator or each element of a multi-element insulator must be at least 300 MΩ.

2. Insulation test with increased voltage of industrial frequency.

The insulation test is carried out according to table. 1.8.24.

Test duration - 1 min.

3. Checking the quality of bolted contact connections.

A random check of the quality of contact tightening is carried out and 2-3% of the connections are opened. Measurement of the contact resistance of contact connections should be carried out selectively at 2-3% of connections. It is recommended to check contact connections for currents exceeding 1000 A in full.

The voltage drop or resistance on the bus section (0,7-0,8 m) at the contact connection should not exceed the voltage drop or resistance on the bus section of the same length by more than 1,2 times.

4. Checking the quality of the molded contact connections.

Pressed contact connections are rejected if:

a) their geometric dimensions (length and diameter of the pressed part) do not comply with the requirements of the installation instructions for connecting clamps of this type;

b) there are cracks, signs of significant corrosion and mechanical damage on the surface of the connector or clamp;

c) the curvature of the molded connector exceeds 3% of its length;

d) the steel core of the pressed connector is displaced relative to the symmetrical position by more than 15% of the length of the pressed part of the wire.

It is necessary to carry out a selective measurement of the contact resistance of 3-5% of the crimped contact connections. The voltage drop or resistance across the connection section should not exceed the voltage drop or resistance across the wire section of the same length by more than 1,2 times.

5. Control of welded contact joints.

Welded contact connections are rejected if immediately after welding the following are detected:

a) burnout of the outer wire or welding failure due to bending of the connected wires;

b) a shrinkage cavity at the welding site with a depth of more than 1/3 of the wire diameter.

6. Testing bushings.

Produced in accordance with 1.8.34.

See other articles Section Rules for the installation of electrical installations (PUE).

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