HYODA

Transformer Protective Products

For the past 80 years, HYODA INSTRUMENTS has developed with transition of transformers. Blessed with technical guidance by manufacturers of heavy electrical equipment and with continuous effort in the whole process from trial manufacturing to merchandising, the company could have provided a variety of protective devices for transformers including temperature relay, oil gauge and pressure relief valve. On the wealth of knowledge stored so far, HYODA INSTRUMENTS is determined to strive further for developing highly reliable and new protective devices.

Dial Oil Gauge for Conservator of Oil Immersed Transformer

Dial Oil Gauge for Conservator of Oil Immersed Transformer Type OG-170

Type OG-170 (ϕ170)

Material of float: NBR (Acrylonitrile-butadiene rubber) formed plastic, natural cork, metal bulb.


Dial plate: 0 to 10 equally graduated.



Specification OG-170

Switch
Microswitch 1~2 Contacts
Switch Rating
AC125V-5A
AC250V-5A

Oil Flow Meter

Oil Flow Meter Type OF-1

Type OF-1

Out flow sensed by the blade is transmitted to the pointer through the magnet coupling for flow control.


An alarm is triggered when oil flow comes down to a preset level.



Specification OF-1

Switch Rating
AC125V-5A
AC250V-5A
RUN
1000ℓ/min
ALARM
600ℓ/min

Buchholz relay

Buchholz relay Type BR-1

Type BR-1

Operation of the first stage: Gas detecting relay
Operation of the second stage: Sudden Oil Flow Relay


Specification BR-1

Switch Rating
AC100V-5A
Oil Flow
100±15cm/sec
Gas Accumulation
450±25cc


Dial Thermometer with Pointer Contact for Molded Type Transformer

Dial Thermometer with Pointer Contact for Molded Type Transformer

Type M3(Φ75), M4(Φ100)

The temperature sensitive unit is designed thin and small so as to be inserted into coil gap to realize indication closer to actual temperature.


Specification M3, M4

Temp Range
0~200℃(5℃/1div.)
Capillary
3m(SUS304)
Contact Rating
AC100V-0.4A
AC200V-0.2A


Sudden Gas Pressure Relay, Sudden Oil Pressure Relay for (N2 Gas Filled) Oil Immersed Transformer

PVG-S

Type PVG-S, PVO-2

To warn an alarm signal by catching sharp pressure rise instantaneously at trouble.



Specification PVG-S, PVO-2

Switch
Microswitch 1 Contact
Switch Rating
AC125V-5A
AC250V-5A


Automatic return pressure relief device

Automatic return pressure relief device

Type PR-100, PR-150, PR-200

The original sealed condition is restored automatically by the spring after releasing pressure at preset pressure.


The type with an alarm switch warns an alarm the moment when pressure is released.



Specification PR-100, PR-150, PR-200

Operating Range
40~100±5kPa
Switch
Microswitch 1~2 Contacts
Contact Rating
AC250V-10A