1. Glass insulator
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Advantages: the mechanical strength of the surface layer of glass insulator is high, the surface is not easy to crack, and the aging speed is slow; It can cancel the live periodic preventive test of insulators during operation, and there is no need to carry out "zero value" detection during operation, so the operation and maintenance cost is low.
Disadvantages: due to the transparency of glass, it is easy to find small cracks and various internal defects and damages during appearance inspection.
2. Ceramic insulator
Advantages: good chemical stability and thermal stability, strong anti-aging ability, good electrical and mechanical properties, and flexible assembly.
Disadvantages: defects are not easy to be found, and they begin to be found only after several years of operation; The zero value detection of ceramic insulators must be carried out one by one on the tower, which requires a lot of manpower and material resources; The probability of accidents caused by lightning stroke and pollution flashover is high.
3. Composite insulator
Advantages: small size, easy maintenance; Light weight and easy installation; High mechanical strength, not easy to break; Excellent seismic performance and good pollution resistance; Fast production cycle and high quality stability.
Disadvantages: anti aging capability is not as good as ceramic and glass insulators, and the production cost is higher than that of ceramic and glass insulators.
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1 scope
This standard specifies the general technical requirements, selection principles, inspection rules, acceptance, packaging and transportation, installation and operational maintenance, and operational performance testing for ac overhead line insulators with nominal voltages above V.
This standard is applicable to disk-type suspended porcelain and glass insulators (insulators for short) used in ac overhead power lines, power plants and substations with nominal voltage above Y and frequency 50Hz. The altitude of the installation site must be lower than m, and the ambient temperature must range from -40 ° c to +40 ° c. 2 Normative reference files
The following documents contain provisions which are referred to in this International Standard. All subsequent amendments (excluding errata) or revisions to dated referenced documents do not apply to this standard; however, parties to agreements under this Standard are encouraged to study the availability of the latest version of these documents. For undated references, the latest version applies to this standard. GB311.1-.
Insulation coordination for high voltage transmission and transformation equipment (NEQ IEC -1∶) GB/T772-
Technical specifications for porcelain high-voltage insulators GB/T775.2 --
Insulators - Test methods - Part 2: Electrical test methods GB/T775.3-
Insulators - Test methods - Part 3: Mechanical test methods GB/T .1
Overhead line insulators of nominal voltages above V - part 1; Definitions, test methods and criteria for ceramic or glass insulator elements for use in alternating current systems (MOD IEC -1) GB/T .5
Electrical terminology for insulating solids, liquids and gases [EQV IEC (212) : ] GB/T .8
Electrical terminology insulators (EQV IEC ) GB/T
Structure and dimensions of suspension insulators for high voltage lines (EQV IEC ) GB/T -
Manual pollution test for high voltage insulators for use in ac systems (IDT IEC ; ). GB/T
Insulators - ceramic or glass insulator elements for use in ac systems for overhead line insulators with nominal voltages above V - characteristics of disk-type suspension insulator elements (mod IEC ∶)
DLT 557-
Impact breakdown testing in air for high voltage line insulators -- Definitions, test methods and criteria (MOD IEC :) DLT 620
Overvoltage protection and insulation coordination for AC electrical installations DLT 626-
Test practice for degraded disc suspension insulators DL/T 812 --
Test method for arc requirements for string insulators for overhead lines with nominal voltages above V (eqv IEC :) DL/T -
Technical specification for design of 110kV ~ 500%kV overhead transmission lines JB/T-
Test method for radio interference of high voltage insulators JB/T -
Cement cement JB/T -- for insulator adhesive installation
Guidelines for use of insulators in polluted areas JB/T --
Specification for iron caps of suspension insulators - Locking pins for ball-and-socket connections of insulator string elements JB/T -
Steel pin JB/T - for disc-type suspension insulators
Exterior quality of glass parts for disc-type suspension glass insulators
JB/T-
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