Production Introduction
138kV Composite Silicone Rubber Substation Insulator
| Rated Voltage | Height | Dry Arcing Distance | Creepage Distance | Specified Cantilever Load (SCL) |
Rod | No. od sheds | Wet Power Frequency Withstand Voltage (kV) |
Lightning Impulse Withstand Voltage (kV) |
| 138kV | 1575±30mm | 1325mm | 3980mm | 20.2kN | 90mm | - | - | 648 |
Parameters
| Item | Requirement | Measured Valued |
| Visual examination | Fuchsine, grey or white, no obvious mechanical admixture. Vulcanized silicon rubber with dense and smooth cutting surface. | Ok |
| Hardness (shore A) | ≮50 | 65~70 |
| Tensile strength (Map) | ≮4 | 4~6 |
| Failure elongation (%) | ≮150 | ≮180 |
| Tearing strength (kN/m) | ≮10 (right angle sample) | 12~15 |
| Volume resistivity (Ω.m) | 1X1012 | 3~8X1012 |
| Puncture strength (kV/mm) | Alternating current ≮22 | ≮30 |
| Tracking and erosion | TMA4.5,erosion depth≯2.5mm | TMA4.5, erosion depth <0.8mm |
| Flammability (Grade) | FV-0 | FV-0 |
feature
| Composite Station Posts (CSP): Solid Core Type | Composite Station Posts: Hollow Core Type (CHSP) | ||
| CSPs, first introduced in the early 1980s, consist of a solid core fiber-reinforced polymeric (FRP) core and an elastomeric housing. The typical diameter of the FRP core ranges from 45 to 100 mm, with maximum diameters rarely exceeding 130 mm. The application of CSPs in substations originated from their previous use in composite line post (CLP) insulators, primarily in the United States. CSPs with solid cores are typically used in voltages up to 245 (420) kV. However, their broader application in higher voltage classes is limited due to relatively high mechanical deflection. The test standard for this product is IEC 62231, while mechanical and electrical characteristics are defined in IEC 62231-1, which also includes ANSI types used in North America. The relevant standard for these ANSI types is C29.19. | At voltage classes higher than 245 kV, both the height and bending moment of station posts increase. Consequently, meeting application requirements using solid core CSP designs, which have core diameters greater than 170 mm, demands significant effort. This makes the technology less cost-competitive compared to porcelain types. Simultaneously, composite hollow core station posts (CHSP) and hybrid station post (HSP) insulators have begun to emerge in this application portfolio. For instance, CHSPs have already been implemented in 800 kV HVDC and 1100 kV UHV applications, featuring connection lengths of over 10 m and tube diameters ranging from 500 to 1000 mm. Bending moments exceeding 1000 kNm are achievable with this technology. The hollow volume inside these posts must be filled with an electrically inert medium, such as insulating gas foam. The applicable test standard for these is IEC 62772. |
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