Daihen Corporation

Pole-Mounted Transformer (Salt Protection Specification)

This product transforms 200V supplies into 100V, and is used to supply electricity to homes and small stores and factories. Though it is common for these transformers to have dip-galvanized casings for protection against salt corrosion, Daihen has developed and is now producing pole-mounted transformers of equal or better rustproof performance with an economical sprayed-on zinc-aluminum protective coat.

● Good rustproof performance
Rustproof performance resulted equal if to or better than dip-galvanization in saltwater tests, saltwater spray tests, combined cycle tests and exposure tests with actual products in salt corrosion areas.
● Distortion correction unnecessary with coated products
Unlike dip-galvanization, the zinc-aluminum droplet rapidly cools because of the spraying and instantly solidifies, therefore the temperature of the coated product rises little, which prevents thermal distortion and the formation of burrs, runs and other projections.
Page Top

Automatic Voltage Regulator

This product automatically keeps outgoing voltage constant by using controller commands to operate the built-in on-load tap changer.

● Application-based lineups
Daihen manufactures standard models for line capacities of 2000 ~ 5000 kVA.
Moreover, single-pole mounted types can be made.
● Stepped power regulation possible
Voltage can be regulated in steps by the number of taps, by automatically operating the on-load tap-changer in proportion to a reference voltage set in the controller.Page Top

Pad-Mounted Transformer

This transformer is designed for pad-mounted power distribution because of the way it blends in with urban scenery, is strong against disasters and occupies minimal space.

● Compact enough for sidewalks and green belts
The transformer itself, switches for protecting the transformer, opening and closing loads and protecting low voltage incoming line, high voltage cutout, fuses and the rest of the hardware are housed in a single casing, therefore it can be located on sidewalks without obstructing pedestrians. And, it is designed so as not to harm anyone who might bump into it.
● Simultaneous supply of single-phase loads and three-phase loads
Two single-phase transformers of differing capacities are housed in a single tank and, using a V connection, can simultaneously supply single-phase loads and three-phase loads.
Page Top

Integrated Vacuum Section Switch

This product incorporates control power transformers and surge arrester elements normally configured as peripheral equipment into an automatic vacuum switch. It improves pole environments over conventional pole models and helps to automate power distribution lines by minimizing installation work.

● Good switching performance
A highly reliable vacuum valve is used as the switch, and delivers good switching performance. Moreover, a snap-action trigger mechanism is used to ensure switching operations regardless of handle operating speeds.
● Improved environments and less installation work
Two control power transformers and six static-shielded elements that conventionally are installed on poles are internally housed, which improves the pole environment and reduces installation work.
● Highly reliable molded control power transformer
Designed not to generate corona discharges, reliability is sound over the long-term.
● Good surge suppression performance
The surge arrester elements are arranged in a gapless configuration that delivers good surge suppression performance against sharp peak wave surges.Page Top

Section Switch Substation

This control device is equipped with communication capabilities in order to monitor and control from remote locations automatic section switches installed on high voltage lines.

● Monitoring capabilities
This substation regularly monitors 11 points amongst which switch ON/OFF and power ON/OFF, and sends results to the transformer substation via a polling system.
● Measuring capabilities
This substation measures 4 media (i.e., voltage, current, phase, etc.) and sends results to the transformer substation via a polling system.
● Control capabilities
Switch ON/OFF operations are controlled from remote or from a local lever inside the substation.
● Self-diagnostic capabilities
The substation regularly runs self-diagnostic checks (ROM check, RAM check, etc.) and reports any detected troubles to the transformer substation. It additionally has a failsafe design that maintains the status of switches.Page Top

Power Equipment Remote Monitoring System

In recent years, businesses have had to promote energy conservation as a measure against global warming and an environmental protection effort. This power equipment remote monitoring system provides information useful towards promoting energy conservation by measuring and analyzing data recorded by power equipment.

● Demand monitoring
Demand is monitored and alarms are issued if excessive demand is predicted.
● Automatic tabulation of monitored data
The system monitors equipment status and measured values, and automatically collects and tabulates data. Collected data can be projected as graphs on computer, making it possible to identify not only current but past situations.
● Automatic notification in the event of equipment trouble
Equipment is constantly monitored for trouble. Trouble notifications can be issued by buzzer, pop-up messages, e-mail or whatever format the user prefers.
● Automatic report generation
Daily, monthly and other periodic reports are generated automatically. Formats can be customized to user preferences.Page Top

Supervoltage Transformer

This supervoltage (500 V) transformer is used by power station and transformer substations. It condenses Daihen’s vast repertoire of super high voltage technology into a compact lightweight transformer. Available per-unit capacity: 500 kV, 1500/3 MVA

● High quality
High quality is guaranteed via software-run electrical and magnetic field analysis, fluid analysis and extra high voltage tests using model transformers.
●Compact, lightweight and low oil demand
Kraft pulp insulation is effectively tailored to electrical fields. Moreover, the bell and back tank make the unit compact and lightweight, and reduce insulating oil demand.
● Low loss
Stray loss is reduced by transposing coils in the appropriate position and anchoring coils externally.
● Low noise
Noise emissions have been reduced to 50 dB in the highest voltage and capacity class, by adopting a Ｖ-notched step lap laminated core.Page Top

Shunt Reactor (Variable Capacity)

This reactor builds an LTC used for on-load tap-changing transformers into a shunt reactor for insertion parallel to systems as an advanced phase dead power absorber. It regulates capacity by changing taps.
Available per-unit capacity: 60 MVA

● Space-saving, low priced
Installation space and equipment investment can be greatly reduced over multiple small capacity units by using this high/low capacity switching shunt reactor.
●Reduced excited rush current
This variable capacity reactor uses the same core for both low and high capacities, therefore core saturation is unlikely when installed and rush current can be reduced to about 60%.
● Low loss
In low capacity operation, the current density of the main coil is extremely low, therefore loss is lower than with ordinary shunt reactors. Moreover, a delta-shaped yoke core that reduced both weight and loss has been adopted.Page Top

Plants	Plants Products
Juso Plant	Pole-Mounted Transformers / Automatic Voltage Regulators / Pad-Mounted Transformers / Control & Telecommunication Equipment / Swiches
Mie Plant	Power Transformers / Shunt Reactor / On-load Tap Changer
Kanehira Plant	Repair of transformers
Chitose Plant	Pole-Mounted Transformers / Automatic Voltage Regulators / Pad-Mounted Transformers / Repair of transformers

■Send any inquiries about power equipment to the below office.
　 TEL：06-6390-5530 / FAX：06-6390-9253