ATT-GN – THREE PHASE AUTOTRASFORMERS – NEUTRAL GENERATORS from 12 to 100kVA

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THREE PHASE AUTOTRASFORMERS – NEUTRAL GENERATORS from 12 to 100kVA

Different power grids in Italy and in the world do not have the Neutral; in the presence of single-phase loads or unbalanced loads it is necessary to generate a stable Neutral. When it is not necessary to separate the loads from the network with a Dyn11 isolating transformer you can use an auto-generator Neutral, incorrectly called an autotransformer as from the construction point of view it is a reactor connected to ZigZag. When you must also adapt the mains voltage (eg. From 220V to 400V) you can use a real step-up/down autotransformer with simple or double ZigZag connection.

schema trasformatore isolamento sicurezza schermo


A	B

power	part no.	voltage	dimensions						DWG	weight	box
KVA	part no.	V	A	B	C	D	E	F	DWG	kg.	code
12	ATTGN407	400	300	150	260	250	123	6	A	31	SAM02
15	ATTGN427	400	300	160	260	250	133	6	A	36	SAM02
20	ATTGN467	400	300	180	260	250	153	6	A	45	SAM02
25	ATTGN507	400	300	180	260	250	153	6	A	46	SAM02
25	ATTGN507	400	300	190	260	250	163	6	A	51	SAM02
30	ATTGN547	400	360	190	310	325	127	8	A	60	SAM03
40	ATTGN627	400	360	210	310	325	147	8	B	73	SAM03
50	ATTGN707	400	420	210	360	375	146	8	B	85	SAM04
60	ATTGN727	400	420	220	360	375	156	8	B	98	SAM04
80	ATTGN767	400	420	240	360	375	176	8	B	117	SAM04
100	ATTGN807	400	420	270	360	375	206	8	B	144	SAM04


neutral generator	step up / down neutral generator

An important application in low voltage application of the zig-zag reactors should be reported, grown in importance with the spread of non-linear loads that draw current not of sinusoidal form, containing, therefore, as to say, a high harmonic content. Such loads (rectifiers, inverters etc.) may be regarded as current generators of harmonics that cause of deforming the voltage drops on the network impedances. The phenomenon is all the more sensitive as far as the power of the distorting load is close to that of the transformer and can become absolutely intolerable when the generator is not the public network but a generator. It is therefore necessary to make sure that the impedances “found” by these currents are as small as possible. The third-harmonic currents, that is, of triple the fundamental frequency and its multiples are in a three-phase system, homopolar backhoe concerned and the impedance is that the zero sequence. The reactors in a zig-zag have, as mentioned, the zero sequence impedances that can be very low for which prevent or at least attenuate the onset of the corresponding voltage harmonics. They work so as compensating harmonics for non-linear loads. They must be installed in the immediate vicinity of the distorting load.

schema collegamento autotrasformatore generatore di neutro

ATT-GN – THREE PHASE AUTOTRASFORMERS – NEUTRAL GENERATORS from 12 to 100kVA

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