Tanaka Electric
Tanaka Electric
Engineered for high dielectric reliability, minimal partial discharge, and seamless compliance with Transelectrica and local distribution protocols.
As the economic powerhouse of Romania and one of South-Eastern Europe’s fastest-growing urban hubs, Greater Bucharest (including the surrounding Ilfov development corridor) is undergoing an unprecedented modernization of its electrical grid infrastructure. Driven by European Union decarbonization mandates, REPowerEU capital allocations, and national energy transition frameworks under the Romanian Energy Regulatory Authority (ANRE), the local grid operator—Rețele Electrice Muntenia (formerly Enel Distribuție Muntenia)—and transmission system operator Transelectrica are accelerating investments into grid resilience, digitalization, and medium-to-high voltage station upgrades.
In this demanding regulatory and operational environment, Voltage Transformers (VTs) / Potential Transformers (PTs) serve as the critical sensory backbone of modern switchgear assemblies, protective relay networks, and SCADA revenue metering systems. A high-performance voltage transformer does not merely step down primary system voltages (such as 400kV, 220kV, 110kV, 20kV, or 10kV) to standard secondary values (100V, 110V, 100/√3 V); it guarantees sub-cycle transient responsiveness, minimizes phase-angle measurement error, and maintains absolute insulation integrity under harsh environmental and electrical stresses.
From the expansion of Metrorex Line M6 connecting Gara de Nord to Henri Coandă International Airport, to the massive influx of hyperscale data centers in Otopeni and Măgurele, the grid demands zero-tolerance for voltage fluctuations, ferroresonance instabilities, or dielectric failure. High-precision instrument transformers compliant with IEC 61869-1/2/3 and EN standards are paramount.
Globally, the demand for voltage transformers is shifting rapidly toward cast-resin dry-type insulated units for indoor switchgear applications, and low-loss oil-immersed or gas-insulated (GIS) units for outdoor substations. Key market dynamics shaping supply chains into Bucharest include:
Tanaka Electric leverages state-of-the-art CNC production lines, vacuum epoxy casting, and automated micro-computer curing to deliver market-leading voltage transformers for global power markets.
Utilizing high-purity hydrophobic epoxy resin processed under strict static vacuum casting systems. Prevents micro-void formation, guaranteeing partial discharge levels well below 5 pC at rated working voltage.
High-permeability cold-rolled grain-oriented (CRGO) silicon steel cores combined with micro-computer CNC automatic winding ensure exact turns ratios, minimal excitation current, and exceptional thermal stability.
Designed to withstand Romania’s severe continental weather extremes—from freezing winter conditions (-25°C) to intense summer heat waves (+40°C)—with heavy-duty UV-resistant and anti-tracking insulation housings.
| Parameter / Model Type | Indoor Epoxy Cast VTs (JDZ / JDZX Series) | Outdoor Oil-Immersed High Voltage VTs | Dual Voltage Pad-Mounted Distribution VTs |
|---|---|---|---|
| Primary Rated Voltage ($U_n$) | 6kV, 10kV, 15kV, 20kV, 35kV | 66kV, 110kV, 132kV, 220kV | 10kV / 20kV Dual Primary Switchable |
| Secondary Rated Voltage | 100V, 110V, 100/√3 V, 110/√3 V | 100V, 110V, 100/3 V (Residual) | 400V / 230V / 110V customized |
| Accuracy Classes (Metering / Protection) | 0.2, 0.5, 1.0 / 3P, 6P | 0.2S, 0.5 / 3P | 0.5, 1.0 / Standard Power Distribution |
| Rated Thermal Burden | 15VA to 300VA (Customizable) | 100VA to 1000VA | 10kVA to 2500kVA |
| Insulation Level (BIL / AC withstand) | Up to 75kV BIL / 42kV AC | Up to 550kV BIL / 230kV AC | LI75 / AC28 according to EN standards |
| Standard Compliance | IEC 61869-1/3, EN 60044-2 | IEC 61869-1/3, Transelectrica Norms | IEEE C57.12 / EN 50588-1 |
Custom-engineered electrical voltage transformation solutions supporting key urban projects across the Romanian capital.
Bucharest’s electrical distribution network is actively transitioning from legacy 10kV to standardized 20kV ring-main units. Our compact JDZ11-20 and JDZ9-10 single-phase indoor resin-cast voltage transformers fit seamlessly into tight MV switchgear cabinets, providing reliable busbar voltage measurement and protection signal input.
For traction substations powering Bucharest’s expanding underground metro network and CFR railway lines, dual-voltage traction transformers and heavy-duty current/voltage instrument transformers deliver robust short-circuit immunity, suppressing harmonic distortion caused by high-frequency power electronics.
The surrounding Wallachian Plain near Bucharest is seeing major solar farm investments. Our 110kV oil-immersed voltage transformers and high-accuracy Class 0.2S PTs act as certified billing meters for solar park developers feeding energy directly into Transelectrica’s transmission lines.
Industrial parks in West Bucharest and Chiajna require isolated step-down transformers and precision instrument transformers for vacuum induction furnaces and heavy machinery, ensuring immunity against transient overvoltages and voltage sags.
A leading high-tech enterprise bringing world-class engineering, ISO-certified manufacturing, and technological ingenuity to global utility and industrial markets.
Zhejiang Tanaka Electric Co., Ltd. is a premier high-tech manufacturer specializing in the research, design, and production of medium and high-voltage power transformers, potential/voltage transformers (VTs), current transformers (CTs), and compact substations. With a registered capital of 110 million RMB, our modern production ecosystem spans over hundreds of key power projects delivered across Europe, Asia, and the Americas.
Our technical department boasts 15 senior engineers, over 30 intermediate technicians, and 17 senior craftsmen, backed by 18 independent patent innovations in dielectric insulation, low-loss core structures, and precision casting.
Explore our comprehensive lineup of outdoor, indoor, oil-immersed, dry-type, and special-purpose instrument transformers engineered for maximum power stability.
Expert answers addressing electrical standards, grid installation parameters, accuracy classes, and logistics for Romanian projects.
Get direct engineering consultations, type test reports, and competitive export pricing for medium and high voltage transformers tailored for the Romanian energy grid.