Electric DC-cable with insulation system
A technology for DC cables and insulators, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve problems such as inappropriate
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Embodiment 1
[0073] Comparative Test
[0074] Test panels treated with prior art compositions for insulated AC cables and with compositions for insulated DC cables according to the invention were prepared and space charge accumulation trends were assessed by recording space charge shapes using pulsed electroacoustic (PEA) techniques. PEA technology is well known in the art and disclosed by Takada, IEEE Trans. Electr, Insul. Vol. E1-22 (No. 4) pp 497-501 (1987).
[0075] a. Molded at 130°C to a 2mm thick polyethylene composition test plate, said composition contains: about 98wt% low density polyethylene (922kg / m2) with a melt flow rate of 0.8g / 10min 3 ); about 0.4 wt% trade name SANTONOX R (manufactured by Flexsys Co), its chemical name is 4,4'-thio-bis(6-tert-butyl-m-cresol), and 1.6 wt% of cross-linking agent, its trade name is DICUP R (manufactured by Hercules Chem) The chemical name is dicumyl peroxide.
[0076] Two semiconductor electrodes were molded on the test board, and the ...
Embodiment 2
[0097] The compounding of the polyethylene-based resin composition is explained below. Add the following additives to low-density polyethylene with an MFR of 1.2g / 10min:
[0098] -1.7wt% dicumyl peroxide type peroxide crosslinking agent;
[0099] - 0.3% by weight of compound (D), a scorch retarder of the 2,4-diphenyl-4-methyl-1-pentene type; and
[0100] - a total amount of 0.3wt% antioxidant system consisting of DSTDP-type compound (B) distearoyl-thiodipropionate and compound (C), 3-(3,5-di-tert-butyl-4 -Hydroxyphenyl)propionic acid and diester of thiodiglycol. The ratio of compound (B) to (C) is 1:3. The compounded resin composition was extruded with 8 mm of insulation on shielded stranded stranded wire conductors and crosslinked at a fabrication temperature of 225°C for a processing time of 5 minutes.
[0101] No appreciable amount of water was detected on the extruded crosslinked insulator.
[0102] No obvious moisture was detected on the extruded cross-linked insulat...
Embodiment 3
[0107] The compounding of the polyethylene-based resin composition will be described below. The following additives are added to the low-density polyethylene resin with MFR of 1.0g / 10min:
[0108] -1.4wt% dicumyl peroxide type peroxide crosslinking agent;
[0109] - 0.4 wt% of compound (D), 2,4-diphenyl-4-methyl-1-pentene type antiscorch agent;
[0110] - 0.3% by weight of an antioxidant consisting only of compound (C), 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and the diester of thiodiglycol. The compounded resin composition was extruded and crosslinked at 300°C.
[0111] The tendency for space charge accumulation measured in the present invention is small and greatly reduced compared to the space charge accumulation typically detected in conventional extruded crosslinked polyethylene based compositions for use in AC cables. Therefore, the cable is considered suitable for use as a DC cable.
[0112] It is also found that the amount of peroxide crosslinking agent...
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