Single-phase shell transformers

SINGLE-PHASE SHELL TRANSFORMER

(also manufactured in single quantities)

This particular designation indicates the type of magnetic core that is used.
The core is formed by a central column, upon which is placed the electric winding, and two outer columns which complete the magnetic circuit, enclosing the coil.

These single-phase transformers are manufactured in accordance with the CEI 96-1, CEI 96-2 (60742) and CEI 96-3 (EN61558) standards when the voltage is below 1000 V.
When it goes over this limit, we refer to IEC 14-8 (IEC 726).

KEY FEATURES OF THE SINGLE-PHASE SHELL TRANSFORMERS

For SELV-PELV safety systems CEI-EN 61558-2-6 safety transformers (with secondary voltage not exceeding 50 Veff) should be requested, with a double or reinforced isolation.

These products are designed according to the client’s specifications (they can be produced according to any particular technical or dimensional requirements)
The isolating materials used in their construction are listed in classes F (155°C) and H (180°C).
Class I (requires ground connection) – Class II (produced only up to 1KVA)
Degree of protection from IP00 to IP20.
They are soaked in oven-dried paints and resins (guarantee of perfect isolation, quiet operation and reliability also in humid and tropical climates).
Routine or type-based testing for each single device.
On request they can be supplied with ELECTROSTATIC SCREENS AND THERMOSTATIC SENSORS inserted between the windings.

The tables below show the indicative dimensions of the transformers, having an input voltage between 36 and 650V and an output voltage between 36 and 650V at a frequency of 50-60Hz.

Construction with terminals on one or on two sides of the transformer depends on the number of input and output voltages from the single-phase transformer itself and on the type of isolation.

DIMENSIONS MAY VARY DEPENDING ON THE NUMBER OF INLETS, OUTLETS AND CURRENT INTENSITY.

See: Technical notes

TYPE	25.25	25.30	25.35	25.40	28.28	28.30	28.35	28.40	28.50	32.32	32.40	32.45	32.50	32.60	36.50	36.55	36.60	40.50	40.60
VA	20/30	30/50	50/60	60/70	40/75	50/75	60/80	110	120	100	125	150	200	220	250	300	350	400	500
A	75	75	75	75	85	85	85	85	85	97	97	97	97	97	108	108	108	120	120
B	55	60	65	70	60	62	67	72	82	68	76	81	86	96	90	95	100	92	102
C	80	80	80	80	90	90	90	90	90	98	98	98	98	98	106	106	106	122	122
D	53	53	53	53	74	74	74	74	74	85	85	85	85	85	95	95	95	104	104
E	44	49	54	59	48	50	55	60	70	54	62	67	72	82	74	79	84	76	86
F	0/37	0/37	0/37	0/37	60	60	60	60	60	68	68	68	68	68	75	75	75	80	80
G	73	78	83	88	75	77	83	88	98	78	86	91	96	106	93	98	103	104	114
Kg.	0.9	1	1.18	1.4	1.52	1.65	1.8	1.95	2.2	1.8	2.25	2.6	3	3.8	4.1	4.5	5	5.4	6

Dimensions expressed in mm.

From type 25.25 to type 40.60, they can be supplied in single packaging using environment-friendly cardboard.

The use of shell-type transformers with a power level above 2500VA is not recommended when a continuous and non-intermittent service is required; for power ratings over 3000VA it is advisable to use

See: single-phase column-type.

TYPE	40.70	40.80	50.50	50.60	50.70	50.80	50.90	50.100	60.70	60.80	60.90	60.100	60.120	60.140	80.80	80.90	80.100	80.110
VA	550	600	700	800	1000	1200	1300	1500	1800	2000	2200	2500	2800	3000	3500	4000	4500	5000
A	120	120	150	150	150	150	150	150	180	180	180	180	180	180	240	240	240	240
B	112	122	96	106	116	126	136	146	126	136	146	156	176	196	160	170	180	190
C	122	122	146	146	146	146	146	146	180	180	180	180	180	180	242	242	246	246
D	104	104	132	132	132	132	132	132	130	130	130	130	130	130	180	180	180	180
E	96	106	78	88	98	108	118	128	102	112	122	132	152	172	120	130	140	150
F	80	80	105	105	105	105	105	105
G	124	134	105	115	125	135	145	158	144	154	164	174	198	218	165	178	190	210
Kg.	6.7	7.6	7.8	9.1	10.5	11.4	12.9	14.7	16.8	18	19.3	20.7	25	29.4	30.8	35	39.5	43

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NOTES: INFORMATION CONCERNING SIZES IS PURELY INDICATIVE AND MAY CHANGE WITHOUT PRIOR NOTICE

THE AUTO-TRANSFORMER IS A TRANSFORMERS WITH A SOLE WINDING COMMON TO BOTH PRIMARY INPUT VOLTAGE AND OUPUT VOLTAGE, AND WITHOUT ELECTRICAL ISOLATION BETWEEN THE SAME.

The equivalent power (referred to as core power in current regulations) is provided by the formula:

Peq=Pn .( Vmax-Vmin.)

_________________

Vmax

where: Peq = actual sizing power (core power)– Pn = rated nominal power (shaft power) — Vmax = highest voltage –Vmin = owest voltage.

To establish the dimensions of the auto-transformer apply the formula to obtain an equivalent power level and then, on the basis of the power obtained, refer to the following tables.