1. Content and Applications
This acknowledgement defines product composites, technical requirement, testing method, inspection rules, mark and packaging of heat shrinkable busbar protection tube.
This acknowledgement applies to heat shrinkable busbar protection tube of 1kV, 10kV and 35kV voltage class.Heat shrinkable busbar protection tubeis used for busbar insulation protection of substation and high and low voltage switch cabinet. Heat shrinkable busbar protection tube is capable of making switch cabinet compact, like reducing the interval distance, to prevent accidental short circuitfault.
2. Standards
GB 1040 Plastics-Determination of tensile properties
GB/T 1408.1 Methods of test for electric strength of solid insulating materials-Tests at power frequencies
GB/T 1409 Methods for the determination of the permittivity and dielectric dissipation factor of solid electrical insulating materials at power, audio and radio frequencies including metre wavelengths
GB 1410 Methods of test for volume resistivity and surface resistivity of solid insulating materials
GB 2408 Plastics-Determination of the burning behavior of horizontal and vertical specimens in contact with a small-flame ignition source
GB 2411 Plastics; Shore hardness test
GB 7141 Plastics-Methods of exposure to thermal air
GB/T 11022 Common technical requirements for high-voltage switchgear
JB 7829 Heat-shrinkable terminations for power cables with rated voltage from 1kV (Um=1.2kV) up to 35kV (Um=40.5kV)
3. Terms
3.1 Heat Shrinkable Material
Heat shrinkable material is a kind of polymer composites consist of rubber and plastics. It is expanded by heating and then cooled rapidly to definite form after being crosslinked by radiation or chemical method. It is able to shrink to the original size by heating before use.
3.2 Heat Shrinkable Tube for Busbar
Heat shrinkable tube for busbar is made of heat shrinkable material. It shrinks on the busbars of electrical equipment for safety protection.
4. Technical Requirements
4.1 Conditions
4.1.1 Temperature range: -40ºC-125ºC.
4.1.2 Long term use in acid and alkali condition.
4.1.3 Meet the strict environment protection requirement.
4.2 Appearance
Surface of heat shrinkable tube for busbar should be clean, smooth, no sign of water or stain, no visible pore and cracking.
4.3 Heat Shrink Property
4.3.1 The initial shrinking temperature is 70ºC and fully shrinking temperature is 125ºC. Since the thick wall of tube for busbar, shrink in an oven at 120ºC or an hot air generator is recommended.
4.3.2 Longitudinal Shrinkage
Longitudinal shrinkage of heat shrinkable busbar protection tube (short for WMPG in Chinese) is generally not more than ±10%.
4.3.3 Radical Shrinkage
Radical shrinkage of heat shrinkable busbar protection tube should be not less than 50%.
4.3.4 Eccentricity
Eccentricity of heat shrinkable busbar protection tubes of 10kV and below voltage class should be not more than 30% and 50% for tubes of 35kV voltage class. Eccentricity of all spec should be not more than 30% after recovery.
4.4 Properties
Product properties refer to Table 1.
4.5 power frequency voltage test and lightning impulse voltage test
The length of not less than 2000mm bus with the heat shrinkable tube contraction in the adaptation and the rectangle busbar, and contraction of the insulated busbar placed parallel to the busbar of another of the same size, the gap between the two bus for 10 kV bus with heat shrinkable tube is 70mm, 20kV bus with heat shrinkable tube is 120mm, 35kV bus with the heat shrinkable tube is 200mm, in insulated busbar applied according table 2 the power frequency voltage, 1min, lightning impulse voltage of positive and negative polarity 15 times each, another of the same size bus grounding.
4.6 Dimension
Product dimension refers to Table3 to Table 6.
4.7 Color
Standard colors include red, yellow and green. Other colors, such as black, blue, etc can be customized.
Frequently Asked Q & A
Q1. You are a manufacturer or trading company?
A: We are a leading manufacturer of shrinkable materials,with best price,high quality and short lead time.
Q2. Can you accept sample orders?
A: Yes, we can accept sample orders and we can also provide free samples for your test if necessary.
Q3. What is your MOQ?
A: Normally, for standard thin wall heat shrink, MOQ is 300m. For standard medium/heavy wall tube MOQ is 500m per size.
Q4. What are your payment terms?
A: As usual, the trade term is FOB Dalian. For order amount less than 10,000 USD, it should be 100% T/T in advance. For order amount over 10,000 USD, 30% deposit and 70% balance against copy of BL is acceptable.
Q5. How can I get my order?
A: Per your requirements, we will arrange the cargo delivered by express (e.g. TNT, DHL, FedEx ) ,by land, by air or by sea. After that, we will give you the tracking number or other relative files for your reference.
Q6. How about your quality?
A: We are a trust worthy supplier for GE, Siemens for more than 10 years. Most of the products got the CE,UL,DNV,CCS and Rohs approval. Let's start with a small trial order or free samples before the final order, then you will get a clear image about the product quality and the relevant cost for transportation.
Q7. How is the delivery time?
A: Usually within 3 weeks.
Q8. Could you offer certificate of origin (e.g. Form-A, Form-E, Form-F, Form-R)?
A: It is totally not a problem. To help you enjoy the tariff concession, we can prepare the relevant certificate of origin.
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