Reactance coils for the start-up of motors

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-motori03 Start-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.

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

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

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

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

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