3.1.2 Insulating Support Bar,Pull Bar and Suspende...
1.Basic Structure and Function
(1)Basic structure.The insulating support rod,pull rod and suspender are generally formed by a combination of metal accessories and hollow tubes,filling tubes and insulating plates.
(2)Functions of insulating support rod and pull rods.It is an insulating load-bearing tool supported by the electric pole body,which can make the conductor horizontally and vertically displaced at the same time.This kind of tool can not only be used to replace the insulator,but also be used to replace the cross arm and the electric pole.
(3)Functions of insulating stringing pull rod(plate).It is an insulating component that bears horizontal loads(tightening force of conductors).To replace a single string of strain insulators,two pull rods are required.To replace the double strings of insulators,only one pull rod is used in most cases and can only be used with a fixed clamp(such as a broadsword clamp).
(4)Functions of insulating hanging pole.Two insulating components that are subjected to vertical loads generally form one group(also used as a single piece)and are used in applications where vertical loads are large.
2.Type and Performance Parameters of Insulating Support Rod,Pull Rod and Suspender
(1)Insulating hanging pole can be classified as common type,fixed type,compression bar type and insulator bracket type according to the structure,among which the first two types shall be used together with fixators and traction machines.
(2)Performance parameters:The shortest effective insulation length,total length and length of each part of the insulating support rod,pull rod and suspender shall comply with the requirements of Table 3-2.It shall be noted that the total length of the support rod is determined by the sum of the shortest effective insulation length of the support rod,the length of the fixed part and the length of the movable part.The total length of the support rod and the pull rod is determined by the sum of the shortest effective insulation length and the length of the fixed part.
Table 3-2 Length Requirements for Insulating Suspender,Pull Rod and Support Rod
3.Usage of Insulating Support Rod,Pull Rod and Suspender
The insulating support rod,pull rod and suspender are mainly used for transfer of conductors,fittings,insulators and so on.Fig.3-4 shows the usage of insulated suspender.
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Fig.3-4 Usage of Insulated Hanging Pole
4.Inspection Items of Insulating Support Rod,Pull Rod and Suspender
(1)First check whether the specifications of the insulating support rod,pull rod and suspender are the same as the working line voltage class.
(2)Check whether the test certificate of insulating support rod,pull rod and suspender is within the validity period.It is strictly forbidden to use the insulating support rod,pull rod and suspender that do not meet the specifications.
(3)Check whether the surface is smooth and there are external damages such as cracks and scratches on the surface of the insulating support rod,pull rod and suspender;the connection between bar sections shall be firm.
(4)The connection between the metal accessories,the hollow tube,the foam filling tube,the solid rod and the insulating plate on the insulating support rod,pull rod and suspender shall be firm and flexible and convenient to use.
5.Precautions for Storage of the Insulating Support Rod,Pull Rod and Suspender
(1)The insulating support rod,pull rod and suspender shall be stored in a well-ventilated and dry environment.
(2)The insulating support rod,pull rod and suspender shall be stored vertically in a special tool cabinet and shall not be placed on the shelves transversely.
6.Preventive Test of the Insulating Support Rod,Pull Rod and Suspender
The routine test of the insulating support rod,pull rod and suspender shall include the following items.
(1)Electrical test.The electrical test items of the insulating support rod,pull rod and suspender include the power frequency withstand voltage test and the operating impulse withstand voltage test.The test cycle is 1 year.
(2)Mechanical test.The mechanical test items of the insulating support rod,pull rod and suspender include a bending static load test and a bending dynamic load test.The test cycle is 2 years.