Comparison Thyristor vs Contactor

8/2/2019 Comparison Thyristor vs Contactor

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DATAR POWER MANAGEMENT PVT. L TD.D-1/35A,, M.I.D.C, Ambad ,Nasik-422010. Tel (0253) 6610105/305 Fax : (0253) 6604828 E-mail : [email protected]

(Technical Comparison)

datar THYRISTORISED SOLID MANUAL SWITCHING CONTACTOR SWITCHINGSTATE SWITCHING SYSTEM

1. Synchronous : No inrush Very large switching Asynchronous : Large switchingcurrent due to precise auto surges. surges as high as 200 times the

zero search logic. rated capacitor current.No current or voltage surge.

Since no inrush current, the Repeated and momentary Short Repeated and momentary shortdistribution transformer Circuit currents due to capacitor circuit currents due to capacitornever subjected to short switching will have impact on switching will impact

circuit current, life of the the life of the transformer the life of the transformertransformer increases.

2. No over compensation, under Welding of the contactor contacts

compensation and unbalanced due to high inrush currents resultingcompensation. in continuous undesirable

over-compensation.

Blowing of fuses due to high current,

causing under-compensation or

unbalanced compensation on network.

3. Smooth and instant disconnection Power fluctuation and voltage decay Power fluctuation and voltage decay

of capacitor units. will result in contactors tending will result in contactors tending

to chatter rapidly leading to very to chatter rapidly leading to veryhigh inrush currents due to repeated high inrush currents due to repeated

short circuits. short circuits.

The capacitor bank unit Manual operation is very much Contactors and capacitors deteriorate

remains in useful operational dependent on the operator. Any lapse in performance over a time, resulting in

service with maximum up time. on the part of the operator may lead down time and non availability of

to improper achievement of P .F. compensation.resulting in financial loss.

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4. Solid State device are designed Switching ON of the capacitors using Switching ON of the capacitors using

to work at very low voltages, as contactors causes problem of chattering contactor causes problem of chattering

no chattering. when operating the contactors at very when operating the contactors at very lowlow voltage resulting in very high inrush voltage resulting in very high inrush

currents due to repeated short circuits. currents due to repeated short circuits.

Compensation at extremely low Compensation at extremely low voltage Compensation at extremely low voltage

voltage is possible. is not possible. is not possible.

5. The point of capacitor switching is High inrush current increases the possibility High inrush current increases the possibility

controlled and hence life of the of MPP capacitors exploding & catching of MPP capacitors exploding and catching fire

capacitor unit and switching unit fire because of the excessive pressure because of the excessive pressure generated

is maximised. generated inside the capacitor unit due inside the capacitor unit due to its self healingto its self healing property. Life of the property. The life of the capacitors

capacitors progressively deteriorates. progressively deteriorates.

6. No sparking at the time of At the time of switch ON, heavy sparks At the time of switching ON, heavy sparks

Switching ON are generated at the contact tips of the are generated at the contact tips of the

contactors causing dangerous situation contactors causing dangerous situations

like fire, short circuits etc. like fire, short circuits etc.

7. Due to small steps, close Usually 25 kV Ar banks are provided and Usually 25 kV Ar capacitor banks are providedcompensation of power factor with these close compensation is not possible. and with these, close compensation is not possible.is possible. In case of operation through an operator,

close compensation impossible.

8. By maintaining P .F. at 0.99/1.00 P .F. cannot be maintained at 0.99/1.00 P.F. cannot be maintained at 0.99/1.00

datar RTPFC augments your constantly because of slow switching constantly because of slow switching ofexisting network capacity by 8 to10% of upto 2 minutes or more. Reswitching upto 2 minutes. Reswitching is not possible

because of ultra fast switching is not possible until the capacitor is until the capacitor is fully dischargedwithin 40 to 60 milliseconds. fully discharged

9. datar RTPFC System is available in Much larger cabinet size is required. Much larger cabinet size is required.compact cabinet size

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10. With only one controller, which Numerous meters at various locations Numerous meters at various locations render

displays all electrical parameter and render it difficult to monitor. No provision it difficult to monitor. No provision for printout

printout facility also possible. for printout facility. facility.

11. Modern technology . Potential Old technology . Old conventional technology but with higherelectricity savings of 10-12%. System power loss.

12. Total maintenance free. No moving Lot of maintenance is required. Maintenance is required for contactors, etc.parts are in the system depend upon will require to replace often.your load condition.

13. The RTPFC can be operated in two Only manual mode operation is possible Only manual mode operation is possible

modes: AUTO & MANUAL. but is dependent on operators efficiency . with MCCB or Isolator.

The mode can be selected by pressinga single mode switch.

In MANUAL mode, the capacitor banks

are connected to the network when INswitch is pressed and the banks are

isolated when OUT switch is pressed.

An electrician can manage this operation.

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Comparison Thyristor vs Contactor

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