Transformers for medical equipment in hospital settings
CONSIDERING THE IMPORTANCE AND THE SPECIFIC CHARACTERISTICS OF ELECTRICAL SYSTEMS DESIGNED FOR MEDICAL USE, IT IS ESSENTIAL TO PRODUCE EXTREMELY SAFE TRANSFORMERS IN TERMS OF BOTH THEIR FUNCTIONAL CHARACTERISTICS AND WITH REGARD TO PROTECTION.
Electrical systems installed in environments set up for medical use are subject to more stringent regulations in relation to:
- The increased danger of possible indirect contact with patients.
- Particular requirements relating to the need to ensure the continuous and efficient operation of equipment essential for the survival of patients and the performance of surgical procedures.
- An increased risk, in case of fire, due to the possible presence of particular gases used in medical practice which are liable to explode when mixed with air.
The isolation transformers for hospital use produced by Carbognin indicate on the data plate the regulatory symbol shown above and therefore satisfy all the most recent requirements of European and international standards.
It is also advisable to use this type of isolation transformer in all those situations where the power supply network may present anomalous instantaneous peaks of voltage caused by the use of converters and infiltration within the line of lightning fragments occurring during thunderstorms.
It is difficult to avoid such instantaneous voltage peaks adopting the normal forms of protection typically included in power circuits and they become highly hazardous when they interfere with sensitive (and possibly very expensive) electrical and electronic equipment (cf. television and telephonic repeater systems and for safety reasons on construction sites, at shipyards etc).
MAIN CHARACTERISTICS OF TRANSFORMERS FOR MEDICAL USE
- The transformers can be constructed according to any requirement of a technical nature and in terms of size, provided the data corresponds to and is compliant with the CEI EN 61558-2-15 (IEC 61558-2-15) standards. Generally, these are 230 – 230V isolation transformers with an electrostatic shield between the primary and secondary or safety transformers with 24V in the secondary circuit.
- If the transformer is three-phase, the secondary will have a star connection with an accessible neutral.
- Insulation materials of classes F and H.
- Use of laminated-metal, very low loss sheeting and use of galvanized materials for metallic parts.
- Double impregnation with paints and resins, oven-dried for at least 8 hours.
ESTING OF TRANSFORMERS FOR GENERAL MEDICAL AND MEDICAL USE
- Insulation tests occurring between the primary and secondary, shielding and earth at 5K Veff, 50Hz for 60 sec.
- Verification of leakage currents between primary, secondary, shielding and earth (less than 0.3mA with power supply at 230V and 50Hz).
- Testing of correction operation.
- Verification of the transformer ground connections with a measurement of resistance from the ground terminal.
- Visual inspection of all machine components, cables, wiring and paint finishes for medical transformers.
|
power |
code |
losses |
tensione |
sizes in mm. |
weight |
design type |
|||||
|
A |
B |
C |
D |
E |
G |
||||||
|
1000 |
1607001 |
18/34 |
3 |
181 |
130 |
190 |
130 |
107 |
140 |
16,9 |
shell-type |
|
2200 |
2508001 |
25/75 |
3 |
200 |
160 |
300 |
150 |
139 |
155 |
31,5 |
column-type |
|
3300 |
2607001 |
30/105 |
3 |
250 |
155 |
350 |
180 |
120 |
160 |
35 |
column-type |
|
4000 |
2608001 |
50/110 |
3 |
250 |
165 |
350 |
180 |
130 |
170 |
41 |
column-type |
|
5500 |
2609001 |
58/135 |
3 |
250 |
175 |
350 |
180 |
140 |
180 |
47,5 |
column-type |
|
7500 |
2708001 |
50/185 |
3 |
280 |
180 |
415 |
210 |
140 |
205 |
58,5 |
column-type |
|
10000 |
2709001 |
60/230 |
3 |
280 |
190 |
415 |
210 |
150 |
215 |
67 |
column-type |
- SWITCH-ON CURRENT 12 TIMES LOWER THAN NOMINAL CURRENT
- PRIMARY VOLTAGE AT 230V AND SECONDARY AT 230V
- Open-type design
- Degree of protection IP00
- Insulation class F and H (Max Ta of 50°C)
- Separated windings in electrolytic copper of class H or higher
- Double impregnation with tropicalizing resin
- Central inlet on the secondary winding
- Double electrostatic shield between primary and secondary
- Designed for inclusion of a thermostatic sensor (optional)
- Low-loss magnetic sheeting
- Installation in IP232 metal housing on request.
THE TABLES BELOW SHOW THE SIZES AND DESIGN OF THE MOST COMMON TYPES OF TRANSFORMERS FOR MEDICAL USES THAT WE HAVE STANDARDIZED. FOR ANY OTHER TYPE OF TRANSFORMER, WHETHER TRI-PHASE OR SINGLE-PHASE, DIMENSIONS WILL BE PROVIDED FOLLOWING A SPECIFIC REQUEST.
NOTES: SIZES ARE PURELY INDICATIVE AND MAY BE MODIFIED WITHOUT PRIOR NOTICE