Product Introduction
A single-phase isolation transformer is a type of single-phase transformer in which the primary winding and secondary winding are completely independent in electrical terms. The core difference from ordinary single-phase transformers is that it achieves complete electrical isolation between input and output circuits through physically independent winding design, and only transfers energy through the magnetic field in the iron core.The main advantages are:
- Electrical safety isolation: prevent the risk of electric shock caused by simultaneous contact with live objects and ground;
- Harmonic suppression: preventing harmonic transmission in the power grid;
- Impedance transformation: increase system impedance to facilitate the coordination of protective devices;
- Prevent system grounding diffusion: single-phase grounding on the load side will not affect the upstream system.
Basic Specification Parameters
|
Item |
Specification range |
|
Input voltage |
220V, 230V, 380V, 400V, 440V, etc. (customizable) |
|
Rated capacity |
0.1 kVA~180 kVA (standard single-phase, special can be customized) |
|
Rated frequency |
50Hz/60Hz (adaptive) |
|
Phase |
Single phase |
|
Output voltage |
110V, 115V, 220V, 230V, 24V, 20V, etc. (customizable) |
|
insulation class |
F-class (155 ℃) standard/B-class optional |
Technical Parameter
Specification selection reference
|
Capacity |
Input voltage |
output voltage |
Dimensions (W × H × D/mm) |
Weight |
Conductor |
|
150VA |
400V (±5%) |
24V / 230V |
84×88×98 |
~3.5kg |
Copper |
|
160VA |
230V |
20V |
97×91×105 |
~4kg |
Copper |
|
500 kVA |
400~440V |
115V / 230V |
120×130×140 |
~9kg |
Copper |
|
1 kVA |
220V |
110V |
160×180×137 |
~16kg |
Aluminum |
|
180 kVA |
220V |
110V |
Customize |
~500kg+ |
Copper/Aluminum |
FAQs
Q1: What is the difference between single-phase isolation transformer and ordinary single-phase transformer?
A: The primary and secondary windings of a regular single-phase transformer may share the same iron core, but they may still be electrically related (such as an autotransformer); The primary and secondary windings of the isolation transformer are completely independent, without direct circuit connections, and only transmit energy through magnetic fields, thus having electrical safety isolation and anti-interference functions.
Q2:What is the maximum capacity of a single-phase isolation transformer?
A: According to the GB 19212.5 standard, the rated output of a single-phase isolation transformer for general use shall not exceed 25kVA. But special customization can reach 180kVA or even higher.
Q3: Why can the efficiency of isolation transformers reach 98%?
A: Using high-quality cold-rolled silicon steel sheets (low iron loss) and high-grade electromagnetic wires (low copper loss), combined with optimized structural design, to control both no-load and load losses at a low level, thereby achieving high efficiency.
Q4: What are the special requirements for medical isolation transformers?
A: According to regulatory requirements:
The capacity should be between 0.5kVA and 8kVA
The rated voltage on the secondary side should not exceed 250V
The leakage current during no-load operation should not exceed 0.5mA
Overload protection should not be installed on the primary and secondary sides;
Q5: How to determine whether it is necessary to install a protective chassis (IP20)?
A: If there is a risk of dust or foreign objects falling in the installation environment, or if it is necessary to prevent personnel from accidentally touching live parts, it is recommended to use a protective case with IP20 or above.
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