Risho cast transformer with touch prevention plate
For power supply to equipment that cannot stop operation, such as data centers.
This is a transformer in which the low-voltage winding and the touch prevention plate are integrally molded with epoxy resin. As a measure against the contact between the high-voltage and low-voltage circuits generated within the transformer, a Type B grounding is applied to the low-voltage circuit. By doing this, if a ground fault occurs somewhere in the low-voltage circuit, a closed circuit is formed through the Type B grounding, resulting in an increase in ground fault current. When the protective device detects this, the entire low-voltage circuit will experience a power outage, causing even equipment that cannot be stopped for various reasons to shut down simultaneously. By applying Type B grounding to the touch prevention plate installed within the low-voltage winding, even if the low-voltage circuit is ungrounded, the contact current generated within the transformer can be discharged to the ground through the touch prevention plate. In cases where equipment that is difficult to stop, such as servers and routers in a data center, is connected to the low-voltage circuit, measures against contact can be implemented by adopting a transformer with a touch prevention plate while keeping the low-voltage circuit ungrounded.
basic information
Transformers with mixed contact prevention boards are suitable for power distribution panels that supply electricity to equipment such as servers and routers, which cannot be stopped. Rishokycast transformers with mixed contact prevention boards are robustly insulated with fiberglass reinforced epoxy resin for both primary and secondary windings, and these are securely fixed with wedges, confirming their ability to withstand tremors equivalent to the Southern Hyogo Earthquake. Furthermore, it has also been confirmed that they have a certain degree of effectiveness in suppressing lightning impulse voltage and harmonics.
Price range
Delivery Time
Model number/Brand name
Rishokyasu
Applications/Examples of results
Perform B-type grounding through a mixed contact prevention plate that is integrally molded with low-pressure winding.
Detailed information
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If the low-voltage circuit is ungrounded, it is very dangerous because if the high-voltage and low-voltage circuits come into contact within the transformer, high voltage can be applied to the equipment without being stepped down.
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If B-type grounding is applied to the low-voltage circuit, even if the high-voltage circuit and low-voltage circuit come into contact within the transformer, large currents can be safely discharged to the ground.
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When a B-type grounding is applied to a low-voltage circuit, if a ground fault occurs somewhere, a closed circuit is formed through the B-type grounding, resulting in a large ground fault current. When the protective device detects this, the entire low-voltage circuit will experience a power outage, and the operation of critical equipment will also stop.
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By installing a touch prevention plate on the transformer and grounding it with Type B grounding, it is possible to safely discharge large currents to the ground due to contact, even if the low-voltage circuit is ungrounded for various reasons.
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B-type grounding wire (green code) drawn from the mixed contact prevention board.
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Damping rate during the application of a sine wave Transformers equipped with anti-contact prevention plates have been confirmed to reduce harmonics that can cause malfunctions in equipment to some extent.
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The fundamental technologies of our company are Laminating Technology and Casting Technology. We are deeply exploring these two technologies and advancing diversification. In the case of general-purpose products, we continue our self-help efforts, such as pursuing thorough rationalization to become a last-one company.