Bus supports 750 kW

Busbar supports type ШО for voltage 750 kV are designed for insulation and fastening of wires, rigid busbars, high-frequency barriers and fixed contacts of suspended disconnectors and grounding switches in open switchgears of power stations and alternating current substations with a frequency of 50 (60) Hz.

Busbar supports for voltage 750 kV structurally consist of 3 main elements:

insulator columns performing insulating and lightning protection functions;
a busbar holder installed on top of the insulator and intended for fastening flexible and rigid busbars;
protective screen(s) that protects against corona and improves voltage distribution along the height of the insulating column.

Also, at the customer’s request, busbar supports can be equipped with a frame and a metal support post, on which the entire structure of the busbar support is fixed.

It is possible to manufacture 750 kV busbar supports in 5 main designs:

ШО-750 (II*)-2 УХЛ1: busbar support for voltage 750 kV with a porcelain insulator with category II* (creepage distance 105 cm), design “2” (for fastening two wires), in climatic version УХЛ1;

ШO-750 (II*)-3 UHL1: the same as in ШO-750 (II*)-3 УХЛ1, but in design “3” (for fastening three wires);

ШO-750 (II*)-4 UHL1: the same as in ШO-750 (II*)-3 УХЛ1, but in design “4” (for fastening four wires);

ШO-750 (II*)-T УХЛ1: the same as in ШO-750 (II*)-3 УХЛ1, but in the “T” design (for fastening a rigid busbar);

ШO-750 (II*)-V: the same as in ШO-750 (II*)-2 УХЛ1, but in design “B” (for installing a high-frequency suppressor or pendant disconnector).

In all versions, creepage distance categories and wire (pipe) diameter must be specified when ordering.

Main technical characteristics

№	Parameter name	Meaning
1	Rated voltage, kV	750
2	Highest operating voltage, kV	780
3	Rated voltage frequency, Hz	50
4	Test alternating short-term voltage, kV:
	— dry	950
	— rain	950
5	Test voltage of full lightning impulse, kV	2100
6	Power frequency test voltage under dirty and humid conditions	500
7	Mechanical bending strength, kN, not less	10
8	Wind and ice-wind loads:
	— permissible wind speed without ice, m/s;	40
	— permissible wind speed during icy conditions with an ice wall thickness of 20 mm, m/s	15
9	Factor of mechanical strength in relation to the load from the tension of wires, taking into account wind and ice, not less	2,5
10	Seismic resistance, points on the MSK-64 scale, not less	8
11	Radio interference level, dB, no more	54
12	Leakage distance of external insulation, cm, not less, for degree of contamination:
	— I;	1260
	— II;	1575
	— II*;	1770
	— III;	1970
	— IV	2440
13	Voltage value of visible corona appearance, kV	500