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Three phase step down starting transformer

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Three phase step down starting transformer

1. Application:QZB series auto-transformer is applied tounfrequent starting of three-phase squirrel-cage inductionmotor which is AC 50Hz,rate input voltage 380v,power is15kW-450kW to improve the affect to the subtransmissionnetwork when the motor starting .The transformer ofteninput 65%,80%and can work in short time when it'sstarting. The starting time should less than 20s in an hour .

2. The above-mentioned products is frequently-used, wecan also manufacture the products by customer design.

3. The above-mentioned specification is for reference,lfhas the change further , please take the material object asthe standard.

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Three phase step down starting transformer

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Three phase step down starting transformer
QZB series auto-transformer is applied to unfrequent starting of three-phase squirrel-cage induction motor which is AC 50/60HZ,rate input voltage 380V,power is 15kW-450kW to improve the affect to the subtransmission network when the motor starting .The transformer often input 65%, 80% and can work in short time when it’s starting.The starting time should less than 20s in an hour.

Basic Data
Input Voltage:380V
Output Voltage:as customer’s design
Output Tapping:65%,80%
Power: from 15KVA to 450KVA
Frequency Hz:50/60Hz
Starting Time:less than 20S in one hour
Isolation Class:E
Ambient temp: -25℃ to +55℃
Efficient≥90%
Winding conductor material;usual use copper,can use aluminum if you have special requirements

Operating environment
1)Temp.:The ambient temperature can not over +40℃。
2)Altitude: Mounting location can not exceed the altitude of 2000m
3)Relative humidity: Maximum 90%
4)The site not attack by rain and snow
5)The medium which no explosion danger, no corroding metal, no electrical breakdown

Testing Items:
No-load Test(No-load Current, No-load Voltage, No-load Loss)
Load Test (Load Voltage, Temperature-rise)
Inductive Voltage Test
DC Resistance Test
Safety Test

Certificate
The certificate of our transformer has CE CQC RoHs UL

Note:
The above-mentioned QZB three phase reduced starting auto-transformer is frequently-used, we can also manufacture the products by customer design. And the specification is for reference, if has the change further, please take the material object as the standard.

Model	Power(VA)	Install size (mm)			Install size (mm)		Install hole (mm)
Model	Power(VA)	A	B	C	D	E	F
QZB-15	15	235	125	185	115	95	8
QZB-17	17	235	130	185	115	100	8
QZB-22	22	280	145	220	137	105	10
QZB-30	30	280	155	220	137	115	10
QZB-45	45	280	175	220	137	135	10
QZB-55	55	280	195	220	137	155	10
QZB-75	75	375	175	290	183	140	12
QZB-100	100	375	185	290	183	150	12
QZB-115	115	375	195	290	183	160	12
QZB-135	135	375	205	290	183	170	12
QZB-155	155	430	205	360	210	140	112
QZB-175	175	430	210	360	210	145	12
QZB-200	200	430	215	360	210	150	12
QZB-225	225	430	220	360	210	155	12
QZB-260	260	490	230	410	240	160	12
QZB-280	280	490	235	410	240	165	12
QZB-300	300	490	240	410	240	170	12
QZB-315	315	490	245	410	240	175	12
QZB-340	340	490	250	410	240	180	12
QZB-400	400	550	265	460	270	185	14
QZB-450	450	550	275	460	270	195	14