IXOSIL MSA – push-on straight joints for HV and EHV cables, 72.5–550 kV
IXOSIL MSA are push-on straight joints for permanent connection of HV and EHV cables rated 72.5–550 kV with cross-linked polyethylene and EPR insulation. They join cables of the same and of different types with copper or aluminium conductors. According to the manufacturer, the joints have been in service for many years around the world in substations, offshore projects and urban underground cable lines.
- Highest operating voltage Um
- 72.5 / 123 / 145 / 170 / 245 / 300 / 420 / 550 kV
- Lightning impulse (BIL)
- 325–1550 kV
- Partial discharges
- < 5 pC
- Conductor cross-section
- 150–2500 mm²
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Among the installations with MSA joints, the manufacturer names lines in deserts with large temperature swings and directly buried cables in soil with a high groundwater level. The joint is water-resistant, so both cases are standard for it. The voltage range is continuous, from 72.5 kV through 123, 145, 170, 245, 300 and 420 kV to 550 kV, and at each level there are versions with different screening, with or without an earthing cable or a screen connection cable.
The basis of the joint is a pre-assembled and tested silicone body. Every joint is checked before delivery, and installation on site becomes simpler. The one-piece dry design and the proven push-on technique shorten installation time. According to the manufacturer, a high-quality, professionally installed joint lasts as long as the cable itself. The conductors are joined with SICON bolted connectors or conventional crimp sleeves, and combinations of different conductor materials and screening systems are possible. The diameter over prepared cable insulation lies within 37–131 mm, so one family covers cables from the smallest HV cross-sections to the largest EHV ones.
The joints are made for conductor cross-sections of 150–2500 mm² and screen connection cable cross-sections of up to 630 mm². Lightning impulse is from 325 to 1550 kV, and the partial discharge level is below 5 pC. For different earthing schemes there are four screen treatment options. DO means a screen through-connection, DE a through-connection with one connection cable, XK a screen break with one concentric cable, XL a break with two cables for screen transposition. The outer housing is heat-shrink, fibreglass-reinforced heat-shrink, PE/PP or copper, and the inner one is metal or aluminium foil. The designation of a variant is composed from these codes, for example MSA 123-XKMG or MSA 420-550-DEMG.
In versions with a plastic housing, a bayonet lock with anti-rotation protection is fixed by turning through 30°, without over-compressing the seal. Splice boxes for joining optical cables, together with installation tools, can be ordered with the joints. Tests were carried out to IEC 60840, IEC 62067 and a British standard. For screen cross-bonding and earthing, the manufacturer supplies suitable LINKBOX terminal boxes with the joints.
Technical specifications
| Highest operating voltage Um | 72.5 / 123 / 145 / 170 / 245 / 300 / 420 / 550 kV |
|---|---|
| Lightning impulse (BIL) | 325–1550 kV |
| Partial discharges | < 5 pC |
| Conductor cross-section | 150–2500 mm² |
| Screen / connection cable cross-section | up to 630 mm² |
| Diameter over prepared insulation | 37–131 mm |
| Screen treatment | DO, DE, XK, XL (through-connection and cross-bonding) |
| Housings | heat-shrink, fibreglass-reinforced heat-shrink, PE/PP, copper |
| Main insulation | silicone |
| Tests | IEC 60840, IEC 62067, British Standard |
Request a price and lead time
IXOSIL MSA – push-on straight joints for HV and EHV cables, 72.5–550 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8535 90 00 00 |
|---|---|
| HS, 6 digits | 8535 90 |
| CN (EU) | 8535 90 00 |
| HTSUS (USA) | 8535 90 80 60 |
| China customs tariff | 8535 90 00 90 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What voltages and cross-sections are MSA joints rated for?
The joints cover Um from 72.5 to 550 kV and conductor cross-sections of 150–2500 mm². The cross-section of the screen connection cable is up to 630 mm².
Are MSA joints suitable for screen transposition schemes?
Yes, variants XK and XL have a screen break with one or two cables for transposition. For them the manufacturer supplies terminal boxes for cross-bonding and earthing of the screens.
Which standards were the joints tested to?
Tests were carried out to IEC 60840, IEC 62067 and a British standard. The partial discharge level is below 5 pC.
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