Posted 11 July 2002 - 09:00 AM
id pre-commisioned (instrumentation test) a brand new wound- rotor induction motor having a capacity of 3000KW. Ive seen its liquid starter cubicle, the question: Is this liquid starter, is put on the primary or in the secondary starting (id suspected on the secondary); please let me know? how the liquid starter alter its resistance? does it most likely the same principle of BRINE TANK TESTER for load testing of Electric generators?
Posted 11 July 2002 - 10:05 PM
Liquid resistance starters come in a number of different forms. Some have adjustable probes or adjustable fluid levels to vary the effective value of the resistance. If the electrolite is saline solution (brine) then the resistance will also reduce with temperature. Is ther is significant power dissipated in the resistors during start, the resistance will reduce during start.
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
Posted 25 October 2002 - 09:47 PM
the resistance is altered by weakening and strengthening of the electrolyte. see our website @ www.oipengineering.co.uk, i can fax you details of how to alter resistance if you give me your fax no.
Posted 22 May 2003 - 07:32 AM
Larger liquid resistance starters as per those described here are often refered to a moving electrode starters.
One of the added advantages of these over conventional fixed electrode liquid resistance starters is that a level of speed control can also be achieved.
Where speed control is required, a heat exchanger is added to the basic moving electrode starter. The saline solution is pumped through heat exchanger to ensure it remains at constant temperature and therefore a constant resistance.
The motor speed which is influenced by the resistance is then controlled by moving the electrodes either further apart or closer together.
Although many people regard these types of starters as being 'old technology' they work extremely well and are easilly serviced by general electrical personel.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users