OVERVIEW OF PROTECTION SYSTEMS FOR ALTERNATOR-www.biaopower.com

OVERVIEW OF PROTECTION SYSTEMS FOR ALTERNATOR

Jul

25 2024

SYSTEM 2

System 2 is used when the alternator environment is very likely to be damp. This system primarily concerns the windings, which are given a special treatment. It should be noted that this treatment protects the windings effectively against all potential aggressors. This same winding protection system will therefore also be used for Systems 4 and 6.

We are the only manufacturer to offer such a high-performance winding protection system at entry level.

From protection system 2 upwards, all windings are protected by an additional coat of enhanced insulation

coating LS EB43, applied by spraying or dipping according to the level of protection required.

For medium and high-voltage products, this additional coating is applied as standard in order to protect the

windings against short-circuits that can occur when high voltage is present. The main stator protection is reinforced still further by brushing a coating of CB 1128 (Polybutadiene) on the non-drive end (NDE) shield, in order to protect this

particularly exposed area.

This flexible coating is only applied to the lower parts of the stator. Feedback from the field has shown this area to be the most vulnerable to attack, as it is here that deposits and condensation tend to concentrate. Moreover, since the thickness of the coating causes the winding temperature to rise, it would be counter-productive from a longevity point of view to apply it all around the stator

FROM SYSTEM 2 UPWARDS, WE OFFER A COMPLETE PROTECTION SYSTEM FOR ALL TYPES OF WINDING

The exciter stator (field) is also covered in a two-part flexible epoxy resin. System 2 is suitable for use in an atmosphere with

humidity higher than 95%, however the ambient temperature should not exceed 40°C.

SYSTEM 4

Protection system 4 uses the same winding protection as system 2 and boosts the protection level of the mechanical parts so as to offer increased resistance to hostile environments. Exposed parts of the alternator rotor shafts are protected against rust with a black coating that has been specially formulated to withstand saline mist.

System 4 is suitable for use in an atmosphere with humidity higher than 95% and an ambient temperature over 40°C.

System 6

This system has been specially designed for using machines in an extreme environment: exposure to sea spray, abrasive dust or corrosive air. In order to guarantee an optimal level of protection, the whole of the machine is specially treated with

the application of a double layer of high-resistance epoxy paint.This additional protection eliminates the risks associated

with premature ageing of the most exposed parts of the machine.

REINFORCED SYSTEM

for High Voltage Alternators

This system is possible on the most powerful machines in our range (LSA 52 and above). For the reinforced system, the exciter windings are replaced by enamel covered copper wire. The other windings are also reinforced with special

insulation systems. Other protections (filters, special paint) can also be applied according to the anticipated conditions of use for the alternator. Standard protection of the high voltage insulation system is provided by a class H epoxy enhanced insulation varnish that reduces surface discharges onto the windings, dust penetration, corrosion and humidity.

ADDITIONAL PROTECTION DEVICES

SPACE HEATERS

Protection systems are inextricably linked to other components that may be added to protect the alternator

In conditions where the humidity is high or the machine is only used irregularly or occasionally, space heaters are a vital component to ensure correct alternator operation. The differences in temperature range between day and night or moisture in the air can cause significant condensation on the inner surfaces of the coils and bearings.

In these conditions, even with reinforced insulation, it is almost impossible to guarantee adequate insulation,

especially in the stator (> 1 MΩ). Space heaters are a good solution to this type of problem, as they keep the

alternator internal temperature above the condensation point. However, they are only really effective if they are

working continuously while the machine is stopped.

Xiamen ZTA Power System Co.,Ltd
Power system supplier-Generator sets, Lighting Tower, Reefer Genset
Add: Room C5, No. 113, Chengyi North Street, Software Park III, Torch High-tech Zone, Xiamen,China.
Email: nancy@ztapower.com | www.ztapower.com
Skype: nancy19830320
Tel/WhatsApp/Wechat: +86-1390 6008 114

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