Engineered for high accuracy, seamless smart grid telemetry integration, and high resistance to tropical climatic conditions.
Understanding the critical demand for intelligent current measurement across East Java's primary economic hub.
As Indonesia’s second-largest metropolis and the primary economic engine of East Java (Jawa Timur), Surabaya stands at the epicenter of a massive industrial and infrastructural evolution. The city’s economic framework is anchored by massive industrial zones such as the Surabaya Industrial Estate Rungkut (SIER), the Margomulyo Logistics Corridor, and the rapidly expanding industrial clusters in nearby Gresik and Sidoarjo. Furthermore, the Port of Tanjung Perak—one of the busiest maritime trade hubs in Southeast Asia—demands continuous, uninterrupted, and highly digitized electrical infrastructure to sustain automated container handling, cold storage facilities, and heavy maritime logistics operations.
Under the national energy framework driven by PT PLN (Persero) UDB Jawa Timur, Surabaya is undergoing a rapid transition toward Advanced Metering Infrastructure (AMI) and Automated Meter Reading (AMR) networks. Modernizing the grid requires replacing legacy electromagnetic metering units with high-precision, digital-ready Intelligent Electric Metering Current Transformers (CTs). The localized grid challenges in Surabaya are distinct and severe:
Surabaya’s coastal location subjects outdoor switchgear, pole-mounted transformers, and industrial metering boxes to heavy salt spray and humidity often exceeding 85% RH, requiring IP67+ hermetically vacuum-cast resin insulation.
Heavy manufacturing industries in SIER utilizing non-linear loads, large VFDs, and arc furnaces inject high total harmonic distortion (THD) into the 20kV distribution grid, causing standard CTs to saturate and misread energy consumption.
With power tariffs for industrial consumers fluctuating, PLN and enterprise facility engineers require strict Class 0.2S revenue-grade metering accuracy across ultra-wide dynamic current ranges (from 1% to 120% rated current).
Information Gain Insight: Sourcing intelligent CTs for Surabaya requires move beyond standard IEC specifications. Components must feature ultra-low phase angle error, transient voltage suppression, and thermal endurance ratings up to Class H (180°C) to withstand the ambient heat of East Java's equatorial climate combined with heavy localized industrial overloads.
How state-of-the-art core metallurgy and IoT integration deliver revenue-grade telemetry for modern smart grids.
The core of an intelligent current transformer dictates its excitation current, saturation point, and phase shift accuracy. Traditional grain-oriented silicon steel (CRGO) cores, while cost-effective, suffer from higher magnetic permeability losses at low primary current levels. For Surabaya’s smart metering projects, our engineering team utilizes high-permeability Nanocrystalline Alloys (Fe-Cu-Nb-Si-B). Nanocrystalline cores exhibit a saturation induction ($B_s$) of 1.2 T combined with an initial permeability exceeding 80,000, allowing our micro CTs and instrument transformers to maintain a flat error curve across wide current fluctuations.
In mature industrial parks like SIER or commercial skyscrapers along Jalan Tunjungan, shutting down power grids for metering installation creates intolerable operational downtime costs. To address this, our portfolio includes high-grade Split-Core Current Transformers (such as the KCT-50 series) and flexible Rogowski Coils. Featuring self-locking clamp mechanisms and precision silicon steel/nickel alloy core joints, these devices allow non-intrusive installation without disconnecting primary busbars or cables, offering dynamic range linearity up to 100kA without magnetic saturation.
| Technology Type | Accuracy Class | Primary Application Scenario | Installation Mechanism | Surabaya Grid Suitability |
|---|---|---|---|---|
| Micro PCB CTs | Class 0.1 / 0.2S | Smart Electricity Meters & IoT Gateways | Direct PCB Through-Hole Mount | Ideal for AMI Residential & Commercial Meters |
| Split-Core CT (KCT Series) | Class 0.5 / 1.0 | Factory Sub-metering & Energy Audits | Clamp-on Self-locking Hinge | Perfect for SIER Industrial Retrofits without Power Cuts |
| Flexible Rogowski Coils | Class 0.5 / 1.0 | High Current & Harmonic Distorted Lines | Flexible Wrap-around Loop | Surabaya Arc Furnaces, Heavy Motors & Switchgear |
| Outdoor Cast-Resin 11kV/35kV CT | Class 0.2S / 5P20 | Substation & Pole-Mounted Distribution | Flange / Pole Mount Structure | Salt-spray Immune Epoxy Resin for Coastal Java Grid |
30+ Years of Manufacturing Mastery in Magnetic Components and Smart Metering Innovations.
Founded in 1993, Fujian Smrtr Technology Co., Ltd. (Zentar®) is a world-class manufacturer of magnetic components specializing in electrical safety, power measurement, and smart energy monitoring technologies. Operating from a state-of-the-art 40,000-square-meter workshop facility in Xiamen, China, the company employs approximately 410 skilled personnel dedicated to pushing the boundaries of magnetic engineering.
Our research and development division is led by university professors alongside 20 senior electrical engineers, continuously driving breakthroughs in micro current transformers, RCD fused connection units, and wireless energy monitoring devices. Operating under strict ISO9001 (since 2002) and automotive-grade IATF 16949 quality management systems, Smrtr Technology ensures that every transformer dispatched to Surabaya meets exact global benchmarks.
Unmatched scalability, tariff-optimized trade agreements, and deep customization capability.
For Indonesian electrical system integrators, panel builders (PEU), and meter manufacturers in Surabaya, sourcing intelligent current transformers directly from top-tier Chinese manufacturers provides strategic competitive advantages over domestic or European suppliers:
Under the ASEAN-China Free Trade Area (ACFTA) agreement, importers in Surabaya can utilize Form E Certificate of Origin documentation provided by Fujian Smrtr Technology, reducing import duties to 0% - 5% at Tanjung Perak Customs.
Integrated with ERP systems since 2008 and utilizing multi-axis automated winding machines, our 50M annual capacity guarantees rapid lead times (as low as 2 to 3 weeks) even for high-volume PLN tender bids.
Whether you require custom secondary ratio outputs (e.g., 5A, 1A, 333mV, 100mA), specific PCB footprint pinouts, or specialized flame-retardant UL94-V0 polycarbonate casings, our engineer team adapts designs rapidly.
Deploying intelligent metering solutions tailored to real-world infrastructure across East Java.
High-rise commercial properties, mixed-use shopping malls, and corporate headquarters in downtown Surabaya require granular energy allocation for tenant billing. Utilizing our Intelligent Temperature Metering Data Collector CTs, facility engineers monitor phase-by-phase active/reactive power consumption alongside real-time busbar junction temperature. Early thermal anomaly detection prevents catastrophic electrical fires caused by loose terminals or overloaded HVAC systems in humid tropical ambient conditions.
Continuous process industries—such as cement manufacturing in Gresik, food processing in Sidoarjo, and metal stamping in Rungkut—rely on medium-voltage dry-type power transformers (500kVA to 2500kVA) paired with vacuum circuit breakers. Integrating JDZW-10R Voltage Transformers and Cast-Resin 11kV Split-Core Instrument Transformers guarantees precise voltage regulation, high dielectric isolation (up to 35kV impulse resistance), and dependable over-current protection under severe transient overvoltages.
Automated gantry cranes and massive refrigerated container bays at Tanjung Perak experience drastic load swings. Standard current transformers suffer core magnetizing errors during rapid cyclic step loads. Our TR High Intelligent 3-Phase Rogowski Coils deliver zero-phase-displacement measurements with extreme linearity, feeding clean data into marine terminal management SCADA systems over RS485 / Modbus communications.
With Indonesian industrial operators aggressively adopting rooftop solar PV systems to meet corporate ESG targets, bi-directional current flow telemetry is mandatory. Our micro current transformers designed for meter verification guarantee Class 0.2 accuracy during low light levels (dawn/dusk), ensuring exact net-metering synchronization with PLN distribution lines.
Technical, logistical, and compliance guidance for importing current transformers into Indonesia.
Direct sea freight routes from Xiamen Port or Fuzhou Port to Tanjung Perak (Surabaya) typically take between 8 to 12 days port-to-port. Including customs clearance and documentation, total transit time is usually within 2 weeks. Air freight options via Juanda International Airport (SUB) are available for urgent sample prototypes within 3 to 5 days.
Yes. All Fujian Smrtr Technology current transformers are designed and manufactured strictly adhering to IEC 61869-1/2 (Instrument Transformers) and IEC 62053 standards. Our products fulfill PLN specifications for accuracy class (0.2, 0.2S, 0.5S), thermal insulation class, and dielectrical strength tests, simplifying local SNI approval processes.
Our outdoor medium and high-voltage transformers (such as the JLSZV-35W and 11kV series) utilize high-grade outdoor hydrophobic epoxy resin (HAP) vacuum casting. Indoor micro CTs feature moisture-proof ultrasonic sealing and tropicalized varnish-coated copper windings, rated for operation up to 95% non-condensing relative humidity.
Absolutely. Our R&D team provides complete ODM customization. Whether you require standard 5A/1A secondary outputs for conventional panel meters or low-voltage millivolt/milliampere outputs (e.g., 333mV, 100mA, 5mA) for direct connection to micro-controller ADC inputs or IoT gateways, we build to your exact technical datasheet.
Explore our full lineup of intelligent metering components, outdoor metering boxes, split-core sensors, and dry-type distribution transformers.
Contact our senior engineering team today for technical datasheets, ACFTA Form E assistance, sample evaluation kits, and custom factory quotes.
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