Industrial HV / MV Power Solutions

OEM/ODM Oil Immersed Current Transformer Suppliers & Exporters Serving the Taguig Market

High-precision outdoor dielectric metering and protection instrument transformers engineered for tropical resilience, high-density metropolitan substations, and Meralco-compliant commercial infrastructure.

High Reliability Fleet

Featured Switchgear Protection, Metering & Control Products

Direct access to our factory-calibrated protection apparatus, instrument transformers, and automated switching control hardware configured for project deployment across Taguig and Metro Manila.

TOMZN TOS7-B Bluetooth Smart Timer Switch 40A 63A 85-265V
Smart Power Control
TOMZN TOS7-B Bluetooth Smart Timer Switch 40A 63A 85-265V EasyCon App Remote Control DIN Rail Countdown 28 Groups Timing Loop
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TOMZN Bluetooth Smart Timer Switch 85-265VAC
Switchgear Automation
TOMZN Bluetooth Smart Timer Switch 85-265VAC 10A 30A EasyCon Wall-mounted Countdown 28 Groups Timing Loop Timing
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TOS6-40 Bluetooth Time Control Switch
Time Switching Modules
TOS6-40 Bluetooth Time Control Switch 35mm DIN Rail Wall-mounted Timing Countdown Loop Timing AC85-265V 40A Tomzn Official
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TOMZN Single Phase Programmable Digital TIME SWITCH Relay
Programmed Relays
TOMZN New Type Din Rail Single Phase Weekly 7 Days Programmable Digital TIME SWITCH Relay Timer AC 220V 230V 12V 24V 48V 16A
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TOMZN 1NO 1NC Single Phase Programmable Digital Timer Switch
Digital Relay Protection
TOMZN 1NO 1NC Din Rail Single Phase Weekly 7 Days Programmable Digital TIME SWITCH Relay Timer AC 220V 230V 12V 24V 48V 16A
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TORT7 Series Delay-ON Delay-OFF 10in1 Asymmetric Cycler
Multi-Function Protection
TORT7 Series Delay-ON Delay-OFF 10in1 Asymmetric Cycler Time Relay Multi-function Timer Switch 0.1S-10D Pulse Generator Interval
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2P DC MCB 1000V Solar Circuit Breaker
Substation DC Ancillary
TOMZN 2P DC MCB 1000V Solar Mini Circuit Breaker Photovoltaic 3A-63A High Breaking Capacity Switch
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TOQ3 2P Dual Power Automatic Transfer Switch
Dual Power Redundancy
TOMZN TOQ3 2P MCB-Type ATS 63A to 125A Dual Power Automatic Transfer Switch Seamless Generator Transfer
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24+
Years Engineering Experience
5,700m²
Liushi Production Base
0.2S
Revenue Metering Accuracy
100%
Factory Dielectric Tested
Industry Whitepaper Deep-Dive

Critical Dielectric Resilience for Metro Manila's Most Dynamic Financial Hub

Taguig City represents the pinnacle of commercial real estate, data center growth, and rapid urban electrification across the Republic of the Philippines. From the ultra-dense commercial substations of Bonifacio Global City (BGC) to the newly expanding logistics networks of ARCA South and the heavy industrial enclaves along the Laguna de Bay periphery, electrical distribution reliability cannot tolerate catastrophic equipment failure.

Oil-immersed current transformers (CTs) serve as the essential sensory hardware for medium-voltage (MV) and high-voltage (HV) protective relaying and revenue metering. In tropical metropolitan environments characterized by persistent 85%+ relative humidity, cyclical torrential rainfall during typhoon season, and corrosive industrial atmospheres, traditional cast-resin designs frequently suffer from surface tracking, partial discharge (PD) degradation, and premature thermal breakdown under heavy, sustained harmonic distortion.

Our OEM/ODM oil-immersed current transformers are purpose-engineered with uninhibited or inhibited high-grade naphthenic transformer oil conforming strictly to IEC 60296. By pairing deep-drawn metallic bellows hermetic sealing systems with vacuum-treated cellulose insulation, we eliminate dissolved moisture absorption and oxygen contact, guaranteeing an operating life expectancy exceeding 30 years without internal core degradation.

  • Hermetically Sealed Integrity: Stainless steel expansion bellows compensate dynamically for ambient temperature shifts between 22°C and 42°C without internal positive overpressure.
  • 0.2S Revenue Precision: Grain-oriented silicon steel or ultra-high permeability nanocrystalline cores achieve exact current ratio fidelity down to 1% nominal current.
  • Seismic & Wind Rigidity: Designed to withstand PGA 0.4g ground acceleration and 250 km/h typhoon wind velocities according to Philippine National Structural Code (NSCP).

Philippine Grid Code (PGC) Compliance

Switchyard substations operating within the Manila Electric Company (Meralco) franchise area require full compliance with the Philippine Distribution Code (PDC) and Philippine Electrical Code (PEC Part 1 & Part 2). Key technical prerequisites include:

Creepage Distance: Class IV Heavy Pollution (≥31 mm/kV) to counter salt mist from Manila Bay and industrial sulfur deposition.
BIL Rating: 75 kV to 650 kV Peak Lightning Impulse Withstand depending on nominal voltage (13.8 kV, 34.5 kV, 69 kV, 115 kV, or 230 kV).
Short-Circuit Withstand: Symmetrical dynamic and thermal limits rated up to 40 kA / 3 seconds for substation safety.
Engineering Comparison

Dead Tank vs. Live Tank Oil Immersed CT Topology Selection

Understanding the architectural advantages between inverted (Live Tank) and conventional (Dead Tank) current transformers when designing substations in congested Metro Manila sites.

Evaluation Parameter Live Tank (Top Core / Inverted) CT Dead Tank (Bottom Core) CT Engineering Implication for Taguig Projects
Primary Conductor Length Extremely short, straight bar design passing directly through top head. Long U-shaped primary winding looped down to tank bottom. Live Tank features lower copper loss, minimized internal heat generation under heavy commercial peak loads.
Dynamic Short-Circuit Withstand Ultra-high mechanical stability; no deflection of primary loop under fault. Subject to electromagnetic repulsion forces along the extended loop. Crucial for high short-circuit duty feeders tied directly to Meralco 115 kV bulk sub-transmission loops.
Center of Gravity & Seismic Higher center of gravity requiring reinforced porcelain or composite bushing. Low center of gravity with major weight residing at steel base. Dead Tank offers natural seismic dampening along earthquake faults; Live Tank utilizes polymer insulators.
Dielectric Oil Volume Minimized oil reservoir volume (typically 30% to 45% less oil). Substantial oil volume required to maintain base clearance. Live Tank reduces environmental oil containment footprint in high-density indoor/basement switchyards.
Secondary Tappings & Cores Accommodates up to 6–8 independent cores (Class 0.2S + 5P20 + PX). Cores clustered in base, allowing complex multi-ratio tap arrangements. Allows concurrent revenue billing, differential bus protection, and backup overcurrent monitoring.
Localized Deployments

Specialized Application Scenarios Across Taguig City

Precision-engineered oil-immersed instrument transformers deployed across diverse industrial, commercial, and utility topologies in the southeastern capital corridor.

Bonifacio Global City (BGC) Substation Underground Feeders

High-rise corporate towers and enterprise data centers demand zero-flicker continuity. Our compact oil-immersed CTs integrate into gas-insulated switchgear (GIS) interfaces and outdoor primary yards to monitor 34.5 kV distribution loops with sub-cycle protective relay actuation.

BGC Commercial Microgrid

ARCA South Intermodal Logistics Substation Switching

Supporting massive automated transport terminals, railway interconnections, and commercial hubs. Units provide dual-ratio secondary windings (e.g., 200-400/5A) to accommodate escalating loads as mixed-use parcels transition from construction phase to operational load.

Mixed-Use Infrastructure

Laguna Lake Coastal Industrial & Manufacturing Plants

Heavy industrial fabrication facilities along the lake littoral zone experience harsh humidity swings and chemical particulate settlement. High creepage silicone rubber or glazed porcelain bushings prevent flashover under heavy seasonal monsoons.

C5-M Corrosive Resistance

Rooftop Commercial Solar Interconnection Points

BGC and Taguig industrial parks are rapidly adopting multi-megawatt rooftop PV. Our dual-core CTs provide precision Class 0.2S net metering for bi-directional energy exports alongside dedicated Class 5P20 overcurrent protection for inverter back-feed isolation.

Solar PV Grid Intertie
Regional Market Trends

Market Evolutions Shaping Metro Manila Electrical Procurement

Procurement directors, M&E consultants, and electrical contractors serving Taguig must anticipate major regulatory shifts and technical transformations in current transformer specifications.

Transition to Smart Digital Substations (IEC 61850)

Meralco and private industrial switchyards are upgrading to IEC 61850 process bus architecture. Our instrument transformers are available with low-power sensor interfaces (LPIT) or standard secondary circuits paired with merging units (MUs) to deliver synchronized sampled values directly to digital protection relays.

Digital Grid Modernization

Adoption of High-Temperature Ester Dielectric Fluids

With space limitations inside Taguig urban substations, fire safety codes are becoming increasingly stringent. We offer customized transformer units charged with natural or synthetic ester dielectric fluids (IEC 61099), providing K-class fire safety points (>300°C flash point) and complete biodegradability near the Laguna Lake watershed.

Eco-Friendly Dielectrics

Composite Silicone Rubber (SIR) Bushings

To mitigate catastrophic explosion hazards from external flashover and to absorb seismic shockwaves during earthquakes along the West Valley Fault, Taguig infrastructure projects are transitioning away from heavy porcelain toward hydrophobic composite silicone rubber insulators with integrated shedding.

Seismic & Explosion Safety
Manufacturer Authority

Zhejiang TMB Electric: Integrated Engineering & Export Excellence

Rooted in Liushi Town, Wenzhou—China's low-voltage and medium-voltage electrical capital—we combine 24 years of manufacturing heritage with rigorous international third-party accreditations.

Unmatched Supply Chain Precision in Liushi Electrical Cluster

Founded on 24 years of relentless engineering specialization, Zhejiang TMB Electric Co., Ltd. operates a comprehensive 5,700 m² state-of-the-art production base staffed by 92 dedicated technicians and electrical engineers. Our geographic position inside Liushi provides an immense strategic advantage: key raw materials, including electrolytic high-purity copper windings, specialized core stampings, precision arc chutes, and flame-retardant housings, are sourced within an immediate 10-kilometer radius.

This deep vertical integration allows us to achieve short tooling turnaround times, comprehensive material traceability, and flexible OEM/ODM modifications for international EPC contractors. Our facility has been strictly audited and on-site verified by TÜV Rheinland, with models carrying CE marking and quality management systems certified to ISO 9001:2015.

End-to-End Routine Factory Quality Testing

Prior to crating for maritime dispatch to the Port of Manila or Batangas Port, 100% of our current transformer assemblies undergo six-stage validation:

  • Oil Breakdown Voltage (BDV): Tested to >60 kV dielectric withstand to eliminate moisture contamination.
  • Partial Discharge Verification: PD < 5 pC at 1.2 Um / √3 guaranteeing void-free oil-paper winding saturation.
  • Ratio & Phase Angle Accuracy: Verified across 1%, 5%, 20%, 100%, and 120% nominal current ranges.
  • Inter-turn Overvoltage Withstand: Continuous primary excitation testing for core saturation safety.
  • Helium Leak Detection: Pressurized vessel integrity check guaranteeing 0% oil weeping over 30 years.

TÜV Rheinland Verified

Comprehensive on-site factory audit verifying facilities, staff counts, assembly lines, and testing equipment legitimacy.

Global Export Capacity

Over US$ 3.3M+ in annual verified exports serving over 100 international markets across Southeast Asia, the Middle East, and the Americas.

Custom OEM / ODM Service

Full support for private label laser engraving, customized terminal configurations, ratio tap design, and tailor-made packaging.

Procurement Guidance

Frequently Asked Questions by Taguig Buyers

Direct technical and commercial answers for project engineers, Meralco-accredited switchboard fabricators, and purchasing authorities.

Do your oil-immersed current transformers meet Meralco substation technical specifications?
Yes. We regularly manufacture instrument transformers compliant with Manila Electric Company (Meralco) distribution and sub-transmission standards. This includes nominal system voltages of 13.8 kV, 34.5 kV, 115 kV, and 230 kV, with basic insulation levels (BIL) tested up to 650 kV crest. Secondary metering cores are calibrated to ANSI/IEEE C57.13 or IEC 61869-2 Class 0.2S for revenue settlement, and protection cores are calibrated to Class 5P20, 10P20, or custom Class PX/PS for high-impedance differential protection.
How do your units withstand the seismic activity and typhoon typhoons common to Metro Manila?
Taguig lies in close proximity to the active West Valley Fault. Our oil-immersed CTs feature dynamic mechanical construction calculated in accordance with IEEE 693 High Seismic qualification standards, resisting peak ground acceleration (PGA) up to 0.5g without seal compromise. For outdoor installations subjected to Pacific typhoons, cast aluminum and hot-dip galvanized steel structural parts withstand sustained wind speeds of up to 250 km/h with total terminal cantilever load ratings exceeding 2,500 N.
What type of transformer oil is supplied, and how is moisture ingress prevented in high humidity?
We use virgin naphthenic mineral oil conforming strictly to IEC 60296 (inhibited or uninhibited, PCB-free). To eliminate contact with the high atmospheric humidity of Taguig (frequently exceeding 90% during rainy seasons), our units utilize a true hermetic sealing architecture with an internal stainless-steel expansion bellows. The bellows contracts and expands to accommodate thermal oil volumetric changes without introducing an air-oil boundary, completely avoiding moisture condensation and oil oxidation.
What is the standard lead time and logistics procedure for shipping to Taguig City?
Standard OEM production turnaround is 20 to 30 working days depending on rating complexity and core quantities. Transit from Ningbo or Shanghai Port to the Port of Manila (North/South Harbor) or Batangas International Port requires only 5 to 8 days on direct maritime lanes. Units are delivered in heavy-duty export plywood crates treated to ISPM-15, complete with nitrogen charging cushions or oil-filled shock indicators to verify zero transit damage.
Can we request multi-ratio primary or secondary configurations for expandable project sites?
Yes, this is highly recommended for developing areas such as ARCA South. We provide primary reconnection configurations (series-parallel head switching) to double current ratios (e.g., 2×100A to 200A) without opening internal oil tanks, or multi-tapped secondary windings (e.g., 200-300-400-600/5A) accessible within the weatherproof IP65 secondary junction box.
What documentation and test reports accompany the shipment for local inspection?
Every serial-numbered CT is supplied with a comprehensive documentation dossier: factory routine test certificate (measuring ratio errors, phase displacement, excitation curves, dielectric loss angle tan-delta, partial discharge, and power-frequency withstand), type test summary reports, Certificate of Origin, and complete maintenance/installation manuals required by local Philippine building and electrical inspectors.

Request Custom Engineering Drawings & Pricing

Submit your single-line diagram (SLD), voltage rating, primary/secondary current ratios, and accuracy class specifications. Our engineering export division responds within 24 hours.

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