What is BS 4999-145 - Specification for winding termination of rotating electrical machines about?
BS 4999-145 is a British Standard. BS 4999-145 specifies types of and performance requirements for winding terminations for rotating electrical machines rated for a.c. voltages up to 15 kV r.m.s. Minimum creepage and clearance distances appropriate to the rated voltages are also specified. BS 4999-145 does not specify requirements for the ability of the terminations of the following machines to withstand a high energy fault:
Machines rated for voltages up to and including 660 V, which it is assumed, would be protected by fuses or other energy limiting devices
Machines rated for voltages of 1,100 V and above either protected by fuses or other energy limiting devices or intended for operation on a system where the nominal short-circuit capacity is lower than the relevant value given in BS 4999-145.
BS 4999-145 applies to terminals, terminal boxes and terminal enclosures, but it does not specify requirements for flameproof terminal enclosures. The choice of a particular termination will be largely governed by the service and environmental conditions, but BS 4999-145 is also relevant to the various types of cables normally used, including aluminium and, where applicable, cable sealing and dividing boxes. It is outside the scope of BS 4999-145 to cover external supply cables in detail, but insofar as the design of the terminals is concerned, essential data are listed.
Note: Winding terminations for small power machines having rated outputs up to and including 0.75 kW or kV·A per 1 000 r/min, such as those specified in BS 5000-11, are not covered by BS 4999-145.
Who is BS 4999-145 - Specification for winding termination of rotating electrical machines for?
BS 4999-145 on specification for winding termination of rotating electrical machines is useful for:
- Electrical engineer
- Manufacturer of winding wire
- Manufacturer of motors and generators
- Power distribution companies
Why should you use BS 4999-145 - Specification for winding termination of rotating electrical machines?
Components in rotating machine are exposed to lot of movement and that is why for proper functioning and safety of components as well as users.
BS 4999-145 provides details for winding termination for rotating machines:
- Definitions
- Ratings
- Ability of terminations for machines rated at 1 100 V and above to
- withstand system faults
- Electrical clearances
- Arrangements and enclosures
BS 4999-145 can help you design cabling in the rotating machine ensuring complete safety.
