Norms of acceptance tests. Complete current ducts (bus ducts)

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Norms of acceptance tests. Complete current ducts (bus ducts)

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

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1.8.26. The scope and standards for testing equipment connected to the busbar and busbar (generator, power and instrument transformers, etc.) are given in the relevant paragraphs of this chapter.

1. Power frequency high voltage test.

The test voltage of the insulation of the current conductor with the disconnected windings of the generator, power voltage transformers is set according to Table. 1.8.24.

The duration of application of the normalized test voltage to the conductor is 1 min.

2. Checking the quality of bolted and welded joints.

Selectively check the tightness of the bolted connections of the busbar, selective disassembly of 1-2 bolted connections of the busbar is carried out in order to check the quality of the contact connections.

Welded joints are subject to inspection in accordance with the instructions for aluminum welding or, if an appropriate installation is available, to control by X-ray or gamma flaw detection or by another method recommended by the manufacturer.

3. Checking the condition of the insulating gaskets.

It is produced for current conductors, the shells of which are isolated from the supporting metal structures. Checking the integrity of the insulating gaskets is carried out by comparative measurements of the voltage drop on the insulating gaskets of the phase section or by measuring the current passing in the metal structures between the sections' beds. Criteria for the absence of short-circuited circuits in the conductors of the generator voltage are given in Table. 1.8.25.

4. Inspection and testing of the device for artificial cooling of the conductor.

Produced according to the manufacturer's instructions.

Table 1.8.24. Test voltage of industrial frequency of conductor insulation

Voltage class, kV	Test voltage, kV, conductors with insulation
Voltage class, kV	porcelain	mixed (ceramic) and solid organic materials
Until 0,69	1	1
6	32	28,8
10	42	37,8
15	55	49,5
35	95	85,5

Table 1.8.25. Criteria for the absence of short-circuited circuits in conductors

Conductor design	Checked node	Condition evaluation criterion	Note
With continuous screens	Insulation of screens or conductor ducts from the transformer and generator case when:
	- a continuous air gap (slot) between the conductor screens and the generator housing;	Absence of a metallic circuit between the screens and the generator case.	By visual inspection
	- one-sided insulation of seals of screens and conductor ducts from the body of the transformer and generator;	The integrity of the insulating sleeves, the absence of contact with the surfaces of the screens or boxes (in places of insulation) of the transformer and generator cases.	By visual inspection
	- double-sided insulation of the seals of removable screens and current ducts connected to the transformer and generator casing.	The insulation resistance of the removable screen or box relative to the transformer and generator case with the tie rods and grounding conductors dismantled must be at least 10 kOhm	Measured with a megaohmmeter for a voltage of 500 V
Sectioned	Insulation of rubber compensators of current conductor screens from the transformer and generator case.	The clear gap between the bolts of adjacent pressure rings of the rubber compensator must be at least 5 mm.	By visual inspection
Sectioned	Insulation of rubber seals for removable and movable screens.	The resistance of the screen insulation relative to metal structures when the tie rods are dismantled must be at least 10 kOhm	Measured with a megaohmmeter for a voltage of 500 V
All types with double layer screen bed gaskets	Insulating gaskets for screen frames	The insulation resistance of gaskets relative to metal structures must be at least 10 kOhm	1. Measured with a megaohmmeter for a voltage of 500 V 2. The condition of the insulating bushings of the bed fastening bolts is checked visually
All Types	Interphase traction of disconnectors and earthing switches	The rods must have insulating inserts or other elements that exclude the formation of a short-circuited circuit.	By visual inspection

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

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