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Inductive reactors for the start-up of asynchronous three-phase motors

Limitation of strain on the network and the motor at start-up

reattanze-per-avviamento-motori03Start-up with stator reactance consists in the insertion of three reactors in the line capable of causing a suitable voltage drop at the motor terminals.

This type of start-up has the advantage of its great simplicity and the feature of an easily adjustable start-up, using the various models available.

The downside is that the rotor will impose a limit on the service provided by the motor (the number of start-ups per hour is equal to 4 or 5) and involves a low power factor at start-up.

Start-up with an auto-transformer is based on the same voltage reduction principle; however, auto-transformers are normally used with large machinery having low / medium-level voltages.

RT3
TT1

MAIN CHARACTERISTICS OF REACTORS FOR THE START-UP OF THREE-PHASE MOTORS

  • THESE REACTORS ARE CROSSED BY HIGH CURRENTS OF BRIEF DURATION THAT GENERATE A HIGH STRAY MAGNETIC FIELD, WHICH CAN HEAT UP AND PLACE UNDER STRESS THE SURROUNDING METALLIC PARTS. 
  • They are sized to create a voltage drop of approximately 30-45% with respect to the nominal value at motor start-up.
  • They are sized to create a voltage drop of approximately 30-45% with respect to the nominal value at motor start-up.
  • In terms of their construction they are very robust, making it possible for them to withstand the strong electro-dynamic stress caused by motor inrush current.
  • Built with materials in classes F and H and impregnated with cementing paint.
  • THE INTENDED USE OF THE REACTORS IS FOR 2 CONSECUTIVE STARTS AND FOUR STARTS/HR OF ABOUT 10-15 SECONDS.
  • BESIDES THE POWER OF THE MOTOR TO BE CONTROLLED, WHEN AN ORDER IS PLACED THE CLIENT MUST ALSO SPECIFY OPERATING VOLTAGE AND FREQUENCY.

The table below provides indicative dimensions (mm) of the most common types of reactors that we have standardized.

TYPE

HP motor

A

B

C

D

E

G

Kg.

RP0.1

2—3

120

57

115

100

46

67

2

RP0.2

4—6

150

78

147

125

56

82

4

RP0.3

7—10

150

93

147

125

71

97

5,4

RP0.4

11—15

150

93

147

125

71

97

5,8

RP0.5

16—22

180

100

180

150

76

106

7,4

RP1

23—29

180

100

185

150

76

108

8,4

RP1.5

30—37

180

106

195

150

86

130

10,9

RP2

40—50

240

120

235

200

90

130

16,8

RP2.2

50—60

240

132

240

200

100

142

20,5

RP2.5

60—70

300

130

290

250

92

130

23,8

RP3

80—100

300

140

290

250

102

166

31

RP3.5

110—120

300

150

300

250

112

190

37

RP4

130—150

300

160

300

250

122

220

42

RP5

160—180

360

175

355

325

140

220

55

RP6

200—220

360

190

350

325

155

240

68

RP7

250—280

360

210

350

325

185

290

89

NOTES:  SIZES ARE PURELY INDICATIVE AND MAY BE MODIFIED WITHOUT PRIOR NOTICE

reattanze per avviamento motori
reattanze per avviamento motori

Contact us now for more information

    Carbognin srl

    We are suppliers of each type of industry which requires the use of electrical and electronic equipment.

    Where we are

    V. Crispi, 9 (z.a).
    36075 - Montecchio Maggiore
    Vicenza - Italy

    Contacts

    Phone: +39 0444 698877
    Fax: +39 0444 698759
    carbognin@carbognin.it

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