Tighten the insulator JH10-120

Tightening insulators, composite tightening insulators, JH10-90 tightening insulators, JH20-90 tightening insulators, JH10-90, JH20-90, JH20-120, JH20-120 tightening insulators

2 Normative reference standards

GB 311Insulation coordination of high-voltage transmission and transformation equipment from 1 to 1997

GB/T19519—2004The nominal voltage is higher than 1000VcommunicationFor overhead power linescompositeinsulator——Definition, testing methods, and acceptance criteria

GB/T 775.1~775.3 Test method for insulators

GB/T 20876.2—2007The nominal voltage is higher than 1000VcommunicationFor overhead power linescompositeinsulatorPart 2: Dimensions and Electrical Characteristics

GB/T 4056 Structure and dimensions of suspension insulator connection for high-voltage transmission lines

JB/T 3384 Sampling Plan for High Voltage Insulators

JB/T 3568 Test method for thermal mechanical properties of disc-shaped suspension insulator string components

JB/T 4307 Cement adhesive for insulator bonding

JB/T 8177 General technical specifications for hot-dip galvanized zinc coating of insulator metal accessories

JB/T 8178 Technical conditions for suspension insulator iron cap

JB/T 9673 Packaging of insulator products

JB/T 9677 Disc-shaped suspension insulator steel foot

JB/T 9678 Appearance quality of disc-shaped suspension glass insulator glass components

JB 9680 Disk shaped suspension insulators for insulation ground wires of high-voltage overhead lines

JB/T 9683 Method for numbering insulator product models

DL/T 557 Air impact breakdown test for high-voltage line insulators - Definition, test methods and criteria

DL/T 812 Test method for power frequency arc of insulator strings of overhead lines with nominal voltage higher than 1000V

JB/T 3567 Test Method for Radio Interference of High Voltage Insulators

3. Environmental conditions for use

3.1 altitude 1000 m

3.2 Maximum ambient temperature+ 40℃

3.3 Minimum ambient temperature －25 ℃

3.4 solar irradiance0.1W/cm² (Wind speed: 0.5m/s）

3.5 Maximum daily temperature difference 25K

3.6Indoor relative humidity: daily average ≤95%，Monthly average value ≤90%

3.7 maximum wind speed35m/s(Note: Wind speed refers to the height above the ground10mThe height10minaverage wind speed)

3.8 load At the same time, there is 10mm ice cover and wind speed of 17.5m/s

3.9 Seismic resistance, ground horizontal acceleration0.2g；Vertical acceleration0.1gSimultaneously functioning. Adopting resonance, sine, and beat wave test methods；excitation5time，each time5wave，Every interval2sThe safety factor shall not be less than1.67.

3.10 Rated frequency of the system:50Hz

4 Technical parameters and requirements

4.1 The product model description is as follows

Name specification:

J——Tightening insulators for overhead power lines；

H——compound material;

10- Suitable for overhead lines with voltage levels of 10 kV and below;

The number after "-" isMechanical tensile failure load value, unit: kN.

Table 1 Technical Parameters and Performance Requirements Response Table for Tightening Insulators

4.2 Dimensional Deviation

Unless otherwise specified, the size deviation of insulators shall comply with the following regulations（d—The size of the sample being tested,mm）：

whend≤300When,±（0.04d＋1.5）mm；

whend＞300When,±（0.025d＋6）mm；

creepage distanceLThe maximum deviation:±50mm (110kV and below), ± 1% L (220kV and above).

4.3 Design and Manufacturing

Insulators consist of at least two parts, namely a core rod and a sheath, and are equipped with metal accessories.

4.4 Core rod

The core rod is the inner insulation part of the insulator and is used to ensure the mechanical strength of the design. The core rod is made of glass fiber reinforced resin rod and should have good acid and corrosion resistance.

The core rod should be able to withstand long-term mechanical and electrical loads over a wide temperature range; The injection process should use high-temperature resistant core rods, which should meet the requirements ofDL/T 864The requirements.

The core rod should meet strict quality control standards in terms of longitudinal and transverse dielectric strength, glass fiber content, moisture absorption, etc. Its dye penetration test and water diffusion test should comply with the provisions of Article 5.4.1 and 5.4.2 of Appendix D of GB/T 19519, respectively.

4.5 Sheath and Umbrella Skirt

The sheath and umbrella skirt are the outer insulation parts of the insulator, which mainly protect the core rod from climate and electrical corrosion, and provide the required creepage distance. The sheath and umbrella skirt are made of silicone rubber material. The minimum thickness of the core rod sheath is shown in the table4

table2　Minimum thickness of sheathdegree

The sheath and umbrella skirt should be integrally formed (using injection or hot pressing molding) or manufactured using extrusion piercing umbrella technology.

The interface between the sheath and the core rod, as well as between the umbrella skirt and the sheath, should be permanently bonded. The bonding part should be firm and compact, without bubbles or gaps, to prevent dirt and moisture from entering, and the bonding strength should be greater than the tear strength of the silicone rubber material itself.　

The requirements for sheath and umbrella skirt materials are:

1） Climate resistance to prevent rapid deterioration caused by ozone, ultraviolet light, humidity, high and low temperatures, etc.

2） The resistance to electric leakage, marking, and corrosion should meet the requirements ofGB/T 19519第5.6The requirement is to prevent the formation of conductive channels and the breakdown of protective sheaths and umbrella skirts.

3） protectThe flame retardancy and AC dielectric strength tests of sleeve and umbrella skirt materials should respectively meet the requirementsGB/T 19519第5.5Jo andDL/T 864第4.3.3articleb）The requirements.

4） The hydrophobicity of the sheath and umbrella skirt materials should meet the requirementsDL/T 864AppendixAThe requirements.

5） High tear strength is required to prevent damage during handling and installation, and its mechanical tensile and tear strength should meet the requirementsDL/T 864第4.3.3articled）Thee）Thef）Theg）The requirements.

6） High hydrolysis resistance is required to prevent an increase in the conductivity of the material, and the volume resistivity of the umbrella cover material should comply withDL/T 864第4.3.3articlea）The requirements.

7） Within the temperature range of the usage environment, high flexibility should be maintained to prevent cracking or rupture caused by low temperatures and rapid temperature changesCrack. To ensure the effectiveness and durability of the core rod protection, the connection interface (core rod sheath, sheath fittings) must be of high quality.

4.6Metal accessories

Metal accessories are the connecting components at both ends of composite insulators.

Metal accessories generally use galvanized steel parts and must have appropriate extensibility to connect with the core rod. Technical requirements, testing methods, and inspection rules must comply withJB/T 8178andJB/T 9677The relevant regulations. All iron metal accessories, except for stainless steel, should be in accordance withJB/T 8177Perform hot-dip galvanizing.

All surfaces of metal accessories should be smooth, free of sharp corners, burrs, or unevenness to prevent corona discharge. If forged, there should be no cracks, thin layers, scars, wrinkles, silver white, etc. Before galvanizing the end fittings, all burrs should be carefully removed and the dimensions of the components should meet the standard requirements. Under normal operating conditions, the visible corona voltage of metal accessories should be within the allowable range, and their radio interference level should meet the requirements specified in the technical parameter table of the dedicated section.

The connection size of metal accessories shall comply with the provisions of GB/T 20876.2.

4.7Locking pin

Insulators for ball and socket connections should be equipped withRType locking pin（220kVand above）. The locking pin should be able to maintain its locked and released position, and should have two separate ends to prevent it from completely coming out of the steel cap.

The locking pin should comply withJB/T 8181The requirements. The locking pin should be made of tin bronze, brass, austenitic stainless steel or other corrosion-resistant materials, and should not be made of materials with anti-corrosion surfaces that are not corrosion-resistant themselves. It should be supplied as a set with insulators. Separate the end of the locking pin into180°When pulled back to its original position, no cracks should be visible upon visual inspection.

The assembly of locking pins should use specialized tools to avoid damaging the galvanized layer of metal accessories.

4.8assembly

10kV～750kVThe connection between the metal accessories of voltage grade insulators and the core rod should use crimping technology.

goldThe connection between the accessory and the sheath should be permanently sealed, and its permeability test should comply withGB/T 19519第6.4Article and clause7.4The rules of the articleDing.

The design of the metal accessory connection area should ensure ideal stress distribution, and the crimping process must use acoustic emission detection method and be equipped with other effective quality control measures to detect each one, to prevent the occurrence of overvoltage and undervoltage problems in the end connection.

The galvanized layer of the metal accessories after crimping treatment should comply withJB/T 8177The galvanized layer at the crimping site (including the junction between pressed and unpressed areas) shall not have defects such as peeling, delamination, cracking, or zinc loss.

Strict management and incoming inspection should be carried out on the materials, properties, dimensions, appearance, and processing technology of outsourced parts such as crimping fittings and core rods. When the outsourced parts are not from the same batch, it is necessary to conduct new pressure and failure tests (including sectional inspection of the crimping area) to determine the new optimal pressing procedure and control parameters, and provide a formal verification report (with color photos of the sectional inspection attached).

The crimping of insulator metal accessories should have original records of crimping operations for quality tracking. The original records should be archived and stored for a long time.

4.9nameplate

Each insulator should have a nameplate indicating the manufacturer's name or trademark, manufacturing date, rated voltage, rated mechanical load, and product number.

The nameplate should be embossed or manufactured using more advanced techniques.

4.10Certificate of Conformity

Each insulator should be accompanied by a certificate of conformity, which should include the manufacturer's name, product number, inspection date, and inspector code.

4.11transportLine maintenance

The provided insulators should be suitable for live maintenance technology, so that general live work can be carried out conveniently, quickly, and safely.