Features

Features

Compact
Short construction time
Long-term operation as an independent substation in desrts and other severe environments.
Vacuum circuit breakers ensure high reliability and manpower-saving in maintenance.

Features

Mobile Transformer and mobile substation rapidly restore electrical service. Compact and easy mobility for Emergency Service, Temporary Service and regularly scheduled maintenance. Mobile transformers are very compact due to the application of MEIDEN special insulation and cooling techniques.Our engineers design mobile transformers to withstand the rigors of road travel while providing maximum stability and protection over uneven pavement.
Rapid restoration of electrical service
Temporary substation capacity increases
Forced outage repairs

Features

Meiden environmentally-friendly solution offer filled with a natural ester-based dielectric insulating fluid instead of mineral oil. The lower flammability of this insulation oil also provides the transformer with higer fire protection. Thye also habe alower pour point, greater moisture tolerance and improved fonction at high temperatures are also non-toxic to aquatic life, readily biodegradable and provide a lower voltatility and higher flash point.
Environmentally friendly
Compactness
Long-term reliability
Applicable to Preventive maintenance technique

Features

Utilizing non-flammable SF6 gas, our gas-insulated transformers eliminate fire hazards and prevent tank explosions. Directly coupling the transformer with gas-insulated switchgear creates a compact, non-polluting facility that minimizes substation space. This highly safe technology is ideal for underground and indoor substations serving shopping districts, transit networks, and public infrastructure.
Where safety against fire is essential Buildings such as hotels, department stores, schools, and hospitals Underground shopping areas, underground substations Sites close to residential areas, factories, chemical plants
Water supply source zones, residential quarters, seaside areas, and water treatment stations specifically demand this equipment to prevent environmental pollution
Where exposure exists to high-level moisture or dust accumulation side tunnels, industrial zones

Features

More than 20,000 Meiden distribution transformers currently power networks across Singapore and other ASEAN countries, maintaining a stable regional power supply.
Pre-designed layout patterns enfure to meet short-delivery resuirements.
Many years of experience ensure to high-quality. Meiden low-loss design meets demading customer requirements.

Features

In large-capacity ultra-high voltage overhead lines and cables, high static capacitance between the line and the ground generally generates a leading current during light load operations.
This leading current actually raises system voltage at the receiving end. Such a phenomenon sometimes make it difficult to regulate generator voltage at the transmitting end and also to control substation power at the receiving end, A shunt reactor can be directly connected to the power, thus increasing the energy efficiency of the system.
The shunt reactor can be directly connected to the power line or to a tertiary winding of a three-winding transformer. MEIDEN shunt reactor designed minimize losses, sound and vibration, using radial block cores, ceramics spacers.
Compensation of the higher capacitive reactive power.
Reduced transmission losses.
Reduction of net work-frequency overvoltage’s in case of load variations.

Features

Features

Features

This is a compact cubicle which uses our VR type compact cubicles and other compact units. It enclosure size is compact. It is based on the front maintenance design. According to the electrical room specification, It can allow the free layout arrangements such as wall surface layout, both sides layout and mutually facing layout.

Going more compact
We use compactct equipment such as VR type circuit breaker, etc.
Going intelligent
It realized intelligent cubicle by integrating protection, monitoring, measurement and control by adopting our protective relays for switchgear
Changing the CT ratio becane easier by adopting wide current range CT.

Specifications

 Features

Epoxy molds all live parts in the main circuit, which a grounded conductive layer then covers.The complete solid insulation method will prevent a one-line earth fault, if it occurs, from developing into a between-phase short-circuit incident. The completely sealed structure protects against adverse environments (contamination or salt damage) or external factors (invasion of small animals).The design slashes the footprint by nearly 50% compared to conventional cubicle-type switchgear, allowing logistics teams to transport the entire panel assembly at once.Technologies to achieve high reliability and labour-saving will reduce the frequency of regular inspections that requires the shut-down of the main circuit down to once every six months Solid insulation design
High reliability and protection against adverse environments
Compact and reduced installaion period
Labour-saving in maintenance and inspection

Comparison of the space required for installation
Comparison of the installation spaces (compared with our products)

Offers a reduction of 35% for equipment space and 53% for installation space.

Specifications

Features

Gas-insulated switchgear (GIS) that incorporates 145 kV single-break vacuum circuit breaker (VCB), which we developed using our extensive experience with vacuum technology, offers much better characteristics than GIS that incorporates on gas circuit breaker (GCB).
Increased reliability by applying VCB
Easy to maintain
Highly resistant to adverse environments , high safety
Drastic saving for installation space*1 *1:Comparison with Conventional Substation

 Features

Overview

Meiden began its research and development of vacuum interrupters in 1965, and released its first commercially available medium voltage VI and vacuum circuit breaker (VCB) in 1970. Since that time, Meiden developed the world’s first high voltage VI, as well as a 168 kV class live tank type VCB (double-break) in 1975. Today, Meiden manufactures VIs for various applications, ranging from 3.3 kV to 145kV.

Features

High quality vacuum valve design certified according to all IEC, ANSI, and GB standards
Long operating life- 250,000 switching operations
Compact
High reliability
Ceramic coating

Applications

Medium voltage VIs for switchgear
Special contact and electrode materials prevent contact. Standard products meet Classes C2 and E2 of the IEC standards, and are compact, with high withstand voltage and heavy current breaking capabilities. Optional external insulation reinforcement is available for interrupters rated 24 kV and higher for capacitor bank switching applications.VIs for electric railway applications
These low voltage vacuum interrupters are engineered with custom bellows to ensure high performance. Meiden’s low voltage VI for railway applications are capable of at least 250,000 switching operations, and can handle current up to 1300A to meet the performance demands of high-speed railway operations.High voltage VIs

Features

Dead Tank Type VCB optimized for green procurement. It uses dry air for insulation in place of the SF6 which is specified as a greenhouse gas. Our basic design concept is to realize the environmental factors in design (The 3Rs (Reduce, Reuse, and Recycle) + LS (Longuse & Separable)) and life-cycle cost (LCC) reduction as basic concepts.
[Reduce] No use of SF6 gas (a greenhouse gas), reduction of eddy current loss by adopting an aluminum tank, reduction of mass by using aluminum materials, and compact design.
[Reuse / Recycle] Reuse of non-rusting and non-corrosive components (reuse of the aluminum and copper materials)
[Long Use] Longer operational life by adopting the VCB
Long operational life without requiring the repair paint work as it uses the aluminum materials
[Separable] Ease of decomposition and collection (no need to collect SF6 gas by collection equipment , no need for SF6 gas reprocessing)

Applications

36/72/84 kV VCB (for Japan Market ) – compliant with the JEC-2300 Standard (for AC circuit breakers).
36/72.5 kV (for overseas markets ) – compliant with IEC 62271-100-2008 and ANSI C37.06-2009.

Specifications

Features

Features

Drawing on vacuum circuit breaker (VCB) expertise since 1977, Meidensha developed the world’s first 145kV single-break insulator-type VCB. This industry-leading technology delivers high voltage and large capacity with a short-circuit breaking capability of up to 40 kA.
Significant Lifecycle Cost Reductions (Compared to conventional double-break models):
Ultra-Compact: 70% reduction in installation footprint.
Lightweight: 30% reduction in total mass, simplifying transport and setup.
High Reliability: 30% reduction in operating energy for superior efficiency.

Specifications

Features

Features

We have a selection of switchgear protective relays to best suit intended applications. All series are digitalized. A self-diagnosis function displays the details of an abnormality detected in the product, allowing a prompt appropriate countermeasure to be taken.
MEIDEN multi-function digital relay
High performance and high functional digital relay offering excellent cost performance JEC2500 compliant and B402 applicable
MEIDEN High-performance multi-function digital relay
A multi-function all-digital relay, providing protection, monitoring, control, and measuring functions
JEC2500 compliant and B402 applicable
MEIDEN MRR Series unit type digital relay
High functional compact digital relay with smooth renewal capability
JEC2500 compliant and B402 applicable

Applications

MEIDEN multi-functional digital relay network systems

MRR Series Digital Relays

1. Spot Network Relay
A relay for protecting and controlling incoming power equipment in a spot network, incorporating such functions as reverse power shut-off, differential voltage closing operation, non-voltage closing operation, and overcurrent protection
Applicable also to a system with a cogeneration system linked to a network bus lines.
Typical applications

2. Voltage Adjustment Relay
A relay that gives control commands to a tap changer during an on-load operation to maintain the desired voltage level.
*This relay works even at a reverse power flow.
Typical applications

3. Temporary Protective Relay incorporating MRR relays)
This provides a temporary protection through DZ and DG elements when the protective relays are shut down during maintenance, etc.
Typical applications

Specifications

MEDIMULseries(MEIDEN multi-function digital relay)

Functions	Specifications Current set values for a 5A rated CT only and divide by 5 for a 1A CT			(※)	R1	R2	R3	R4	B1	B2	F1	F2
					HV incoming substations	Main transformer secondary	MV incoming 1	MV incoming 2	Bus (for EVT)	Bus (for ZPD)	Feeder (for EVT)	Feeder (for ZPD)
	Device	Setting range	Operating time
Protection elements	51L	1.0 to 8.0 A, lock (steps of 0.1 A)	It = 0.5 to 10.0 (steps of 0.1) 3 characteristics (inverse, long, ultra)		3	2	2	2			2	2
	51H	1.0 to 80 A, lock (steps of 1 A)	0.04 to 1.00 s, definite time (steps of 0.01 s)		3	2	2	2			2	2
	51G	0.1 to 2.0 A, lock (steps of 0.1 A)	0.05 to 1.00 s, definite time (steps of 0.01 s) with malfunction countermeasure against inrush current
	27	10 to 110 V, lock (steps of 1 V)	0.05 to 10.00 s, definite time (steps of 0.05 s)					3	3	3
	59	100 to 150 V, lock (steps of 1 V)	0.1 to 10.0 s, definite time (steps of 0.1 s)
	64 (EVT)	3 to 80 V, lock (steps of 1 V)	0.2 to 30.0 s, definite time (steps of 0.1 s)
	64 (ZPD)	30 to 400 mV, lock (steps of 5 mV)	0.2 to 30.0 s, definite time (steps of 0.1 s)
	67G (EVT)	Io = 1.0 to 6.0 mA, lock ZCT secondary (steps of 0.1 mA) Vo: 3 to 80 V (steps of 1 V) ϕ: Advance of 0 to 80° (steps of 1°)	0.1 to 2.0 s, definite time (steps of 0.1 s)
	67G (ZPD)	Io = 1.0 to 6.0 mA, lock ZCT secondary (steps of 0.1 mA) Vo: 30 to 400 mV (steps of 5 mV) Vo: 3 to 80 V (steps of 1 V)
Measuring	Item	Measuring range	Class, response
	Current	CT primary rated current x (0.03 to 1.99) A	Class 1.5, response: 0.5 s		3	3	3	3			3	3
	Voltage	VT primary rated voltage x (0.03 to 1.40) kV	Class 1.5, response: 0.5 s					3	3	3
	Zero phase voltage	1.0 V to 130.0 V at EVT third voltage	Response: 0.5 s
	Zero phase voltage	6.0 to 600.0 mV at ZPD secondary voltage	Response: 0.5 s
	Maximum zero phase voltage	EVT primary rated voltage x (0.03 to 1.40) kV	Class 1.5 response: 5 cycles
	Maximum zero phase voltage	ZPD primary rated voltage x (0.03 to 1.40) kV	Response: 5 cycles
	Leakage current (residual)	CT secondary rated current (A) x (200 to 400) mA	Response: 0.5 s
	Leakage current (ZCT)	0.10 to 30.00 mA at ZCT secondary current	Response: 0.5 s

Note: * of O* indicates the number of phases.
(*) Type list

Abbreviations	R1	R2	R3	R4	B1	B2	F1	F2
Application	HV incoming(residual 51 G)	Main transformer secondary,MV generator(for EVT)	MV incoming, MV generator(for ZPD)	MV main transformer secondary	Bus(for EVT)	Bus(for ZPD)	Feeder(for EVT)	Feeder(for ZPD)
Type (5 A rating)	MR63M-01	MR63M-02	MR63M-03	MR63M-04	MB63M-01	MB63M-02	MF63M-01	MF63M-02
Type (1 A rating)	MR63M-01A	MR63M-02A	MR63M-03A	MR63M-04A			MF63M-01A	MF63M-02A

Types		S2 unit	S1 special unit	Built-in device
Product name		Spot network relay	Voltage adjustment relay for distribution substations	Temporary protective relay
Type		MN80S2-01	MT80S1-01/01A	MR3-1003
Rating	Current	5A	5/√3 / √3A	5A
	frequency	50/60Hz	50Hz	60Hz
Normal service conditions	Ambient temperature	Range of performance guarantee: 0 ~ 40°C	←	←
		Range of operation guarantee: -10 ~ 50°C	←	←
		Range of recovery guarantee: -20 ~ 60°C	←	←
	Relative humidity	30 ~ 80%	←	←
	Altitude	2,000 m or less	←	←
Frequency characteristics		Rated frequency = operating value with fluctuation of ±5%: Within ±5% of rated frequency
Insulation resistance		Between electrical circuits: 5 MΩ Between the whole electrical circuits and casing (earth potential): 10 MΩ Provided that the relative humidity is 80% or less.	← ← ←	Between electrical circuits: 2 MΩ Between the whole electrical circuits and casing (earth potential): 2 MΩ Provided that the relative humidity is 80% or less.
Withstand voltage		Between electrical circuits: 2000 V for one minute Between the whole electrical circuits and casing (earth potential): 2000 V for one minute	← ←	← ←
Lightning impulse withstand voltage		Positive and negative 1.2/50 μs waveforms applied 3 times each. Between control circuits: 3 kV Between the whole electrical circuits and earth: 4.5 kV	← ← ←	← Between the whole electrical circuits and earth: 4 kV
Noise immunity		EFT/B tested other than B-402	← ←	B-402 tested
Contact capacity	Control outputs	Current capacity 5 A, closing 10 A (0.5 s), opening 0.1 A (DC110 V, R load)	AC 250 V, open/close 1.5 A (inductive load: COS φ = 0.4)	5 A continuous (max 15 A, 2 seconds)
	External display	Standstill output open/close 60 mA	←	Current capacity 5 A, interruption 0.5 A (R load)
Installed relay elements	Main detects	67L, 67H, 78, 51L/H, 57 27S, 78, 27B, 84S	90R·L, 59B, 27B	44SX1, 44SX2, 44SD, 44SR 51D, 51φ 67G, 67GA1, 67GA2, 64 51H, 51A, 51, 51GA, 51G 27B, 64B
	Fault detects	67LF, 67HF, 51F, 27SF, 78F, 27BF, 84SF	59A, 27A	51DF, 51F, 64F, 51GF, 27F

 

Features

Features

Cross sectional view of the 10 MVA class engine generator

Cross sectional view of the 20 MVA class engine generator

We meet the diversifying needs for generator such as high quality, high efficiency, and compact design.
Compact and light weight design
High reliability and long operational life
High performance
Easy maintenance and inspection
Low noise
Short delivery
It offers sophisticated control by combining the digital AVR (automatic voltage regulator).

Applications

Specifications

Standard Specifications

Item		Standard Specifications	Modified Specifications
Environmental conditions	Ambient temperature	-15-40°C	Please specify when non-standard specifications are needed.
	Altitude	1,000 m or less
	Humidity	90% or less
Types of rating		Continuous	Please specify when non-standard specifications are needed.
Output		5,000-28,000kVA
Voltage		3300V/6600V/11000V/13800V
Power factor		90% (lagging), 80% (lagging)
Frequency		50Hz/60Hz
Number of poles		8-pole to 14-pole
Applicable standards		JEC2130/IEC60034
Protection degree		IP21 (protection drip-proof type)
Cooling system		IC01 (free ventilation type)
Thermal class		155(F)
Temperature rise limit		155(F)	130(B)
Type of the rotator		Salient pole type
Lubrication system		Forced lubrication	Self-lubrication
Method of supporting bearings		Single bearing or double bearings
Excitation system		Brushless type with permanent magnet generator (PMG)	Brushless type with excitation transformer

Features

We have been actively working to construct a biomass power generation plant using renewable energy (rice husks, empty palm shells, wood chips, bagasse, etc.) having a significant effect of discharging and reducing greenhouse gas (methane and carbon dioxide). Effective use of renewable energy has been receiving lots of attention, and we can consider a power generation system using various types of biofuel. Please feel free to contact us.

Case Study

9.95 MW Rice Husk Burning Biomass Power Generation Facility for Thailand
The fuel used is rice husks that are waste from rice mills, which have not been conventionally used.
Switching from fossil fuels reduces greenhouse gases.
It is easy to obtain the rice husk fuel from nearby locations.

10.4 MW Palm Empty Fruit Bunch Burning Biomass Power Generation Facility for Thailand
The fuel used is palm kernel shells (EFB: Empty Fruit Bunch), residues which have not been conventionally used.
The EFB contains oil, allowing us to contribute to the substitution effect of fossil fuel and the reduction of greenhouse gases such as methane and CO2 by effectively using it as fuel.
The company built the plant near a palm oil factory to secure a stable supply of EFB.
We can expect CO2 reduction of 1,100,000 tons in 6 years by supplying power generated using palm kernel shells as fuel.

Features

No. 1 transformation efficiency in the industry with safe and secure built-in transformer!
The new SP310 100kW machine accepts a DC input of up to 750V.

Features

Generator interconnection operation

Saving the fossile fuel at the time of blackout
This system contributes to consume less fossile fuel at the time of black out, using our PCS equipped generator interconnection operation.

Features

Features

 

This is an ultra-compact type control & protection system which offers high functions and low cost. It contributes the cost reduction for small & medium capacity hydroelectric power stations.
High reliability and safety
Space-saving
Labor saving in maintenance & inspection
We offer a rich variety of system offerings.

Specifications

Model Code
The MYGENEQUE series, an all-in-one integrated control and protection device, allows you to configure the system by selecting the required functions. Configuration examples are shown in the table below.

Model	Sequence Control (S)	Excitation Control (E)	Governor Control (G)	Generator Protection (R)	Communication Functions
					Ethernet Function (L)	Web Function (W)	Telecom Function (T)
MYGENEQUE-SEGRLWT	●	●	●	●	●	●	●
MYGENEQUE-SEGRLT	●	●	●	●	●		●
MYGENEQUE-SEGR	●	●	●	●
MYGENEQUE-SEGL	●	●	●		●
MYGENEQUE-SGR	●		●	●
MYGENEQUE-SEG	●	●	●
MYGENEQUE-SET	●	●					●
MYGENEQUE-SR	●			●
MYGENEQUE-EG		●	●				●
MYGENEQUE-T							●

(Note) Various combinations other than these are also available.
General Specifications
This product is available in two types: General-purpose specification type and Electric power specification type.
For the general-purpose specification type, the applicable standard is basically based on Rationalization Level “a” of the Electric Power Cooperative Research Vol. 57, No. 5, “Rationalization of Control and Protection Systems for General Hydroelectric Power Plants.” However, the protection elements comply with the Electric Power Standard B402. The electric power specification type satisfies the conventional Denkyoken (Electric Power Cooperative Research) standard for hydroelectric power.

Item		Specifications
Applicable Standards		“Modernization of Control and Protection Systems for General Hydroelectric Power Plants” (Electric Cooperative Research Vol. 57 No. 5), Power Utility Standard B402, etc.
Cooling Method		Natural cooling
Power Supply	Rated Voltage	External input power supply: 110V DC      PLC power supply: ① 110V DC (Power utility specs) ② 24V DC (General-purpose specs)
	Allowable Voltage Range	External input power supply: 90 to 140V DC
	Power Consumption	33.1W or less
	Allowable Instantaneous Power Failure Time	20ms
Temperature	Ambient Temperature	0 to 40°C (provided that no condensation or freezing occurs)
	Storage Temperature	-25 to +70°C
Relative Humidity		50 to 80% RH
Atmosphere		Must be free of explosive, flammable, corrosive gases, and dust
Dielectric Strength		Power utility specs: All power terminals vs FG, 2000V AC for 1 minute (excluding surge removal circuits) General-purpose specs: All power terminals vs FG, 1500V AC for 1 minute (excluding surge removal circuits)
Noise Resistance		Damped oscillatory wave surge, square wave impulse noise, radio frequency noise, electrostatic discharge noise
Hardware Configuration		Power utility specs: Single configuration, [Option]: Redundant power supply configuration, Redundant system configuration General-purpose specs: Single configuration

System configuration

Very compact design system equipped with the necessary functions for hydroelectric power station
Reduction of control cables with the remote I/O function
The subunit equipped with I/O function can be remotely operated from a maximum of 500 m of the length of the optical fiber between the optical FA buses.
The control signal cables can be reduced with optical connection by installing a remote I/O panel equipped with the subunit on the floor of the hydraulic turbine and generator in the power station with a vertical shaft machine.

 

Features

Device map for power storage system products*
PCS for redox flow (RF)
PCS for lithium ion battery (LiB)
Lead storage battery PCS
PCS for lithium ion capacitor (LiC)
Broad lineups with various system capacities from from 250 kVA to 4800kVA
We will build the optimal systems in combination with various storage batteries in consideration of customer’s requirements and characteristics of storage battery．
Our customers benefit from our support in enhancing business continuity, which includes emergency power supply applications and dynamic voltage compensation.
We provide functions in support of various applications including power peak-shaving and grid stabilization.
With No. 1 supply records in Japan, we provide high quality products and standardized design.

Types of storage battery for energy storage

There are various storage batteries for energy storage, and each battery has distinct features.
Meiden proposes the optimal combination of right storage battery and AC-DC converter equipment to fit the purpose and application of the customer by drawing on our rich supply experiences.
NAS battery （Note: NAS battery is a registered trademark or product name of NGK Insulators, Ltd.  and Tokyo Electric Power Company, Incorporated.)
Load leveling/ peak shaving, grid independent operation function, instantaneous voltage drop countermeasure (UPS) function, system stabilization (adjustment of frequency), etc.

Redox flow (RF) battery

Load leveling/ peak shaving, grid independent operation function, grid stabilization, etc.

Lithium ion (LiB) battery

Grid stabilization, load fluctuation suppression (mitigation of electric power fluctuation), etc.

Lead storage battery

Stand-alone operation function, instantaneous voltage drop countermeasure (UPS) function, etc.

Lithium ion capacitor

Dynamic voltage compensation (DVC) by UPS, grid stabilization, load fluctuation suppression, utilization of regenerative power, etc.

Applications

Load leveling/ peak shaving:

The energy storage system stores cheap night-time power and discharges it during the day for peak-shaving. This strategy allows you to reduce contract power demand and shave peaks during the daytime power peak period.

Stand-alone operation function:

The energy storage battery supplies power to the load. Compared to diesel or gas turbine emergency generators, this function ensures a rapid startup (under 2 seconds) and discharges no soot or smoke.

Dynamic voltage compensation (DVC) function by UPS:

It protects the load facilities on the power network against instantaneous voltage drops (power outages). Because the system equips the energy storage battery with a large capacity, it provides a longer power interruption backup than a normal UPS (5 to 30 minutes).

Grid stabilization:

The system charges and discharges the storage battery to mitigate grid voltage and frequency fluctuations. It can supply both reactive and active power.

Load fluctuation suppression:

The system charges and discharges the storage battery to mitigate sudden fluctuations in the local load. It can supply both reactive and active power. Furthermore, combining the system with a private power generator reduces the load’s starting current, thereby expanding the generator’s autonomous operation capacity.

Utilization of regenerative power:

The system prevents reverse power flow by absorbing (charging) the regenerative power that occurs when the electric motor decelerates. In addition, the system discharges this absorbed electric power when the electric motor accelerates, which saves energy.

Specifications

Equipment name		Power conditioning subsystem (PCS) for NAS battery system (Large capacity system)	Power conditioning subsystem (PCS) for storage battery (Medium/ small capacity system)
Equipment capacity		600kW/1200kW/1800kW /2400kW/3600kW/4800kW	250kW/500kW/750kW/ 1000kW/1250kW/1500kW/ 1750kW/2000kW
Grid voltage (AC side)		6.6kV（3.3kV）	440V/420V/400V
Battery voltage fluctuation range (DC side)		480～750V	240V～600V
Applicable storage battery
Functions	NAS battery	○	×
	Redox flow battery	○	○
	Lithium ion battery	○	○
	Lead storage battery	○	○
	Lithium ion capacitor	○	○
	Load balancing/ power peak-shaving	○	○
	Autonomous operation	○	○
	Dynamic voltage compensation (DVC) by UPS	○	×
	Grid stabilization	○	○
	Load fluctuation suppression	○	○
	Utilization of regenerative energy	○	○