Precision Power Monitoring: Mataas na Katumpakan Dual-Ratio Outdoor Digital Current Transformer Solution

Pinagsamang Solusyon:​​
Ang aming napakalaking Outdoor Current Transformer (CT) na solusyon ay naglalaman ng ​Multi-Tap Dual-Ratio Sensing​ kasama ang isang ​Digital Merging Unit (MU)​​ upang magbigay ng mapagkakasyahang, mataas na presisyong pagsukat ng kuryente para sa mga dynamic power environments tulad ng renewable integration sites. Ang IEC 61850-compliant na sistemang ito ay nagwawala ng tradisyonal na pagtukoy sa pagitan ng wasto at reliabilidad sa pamamagitan ng pagbibigay ng real-time ratio switching at digital data output.

​Paggawa ng Core Technology​

1. ​Dual-Ratio Sensing Core​
• ​Innovation:​​ Na-embed na multi-tap windings na sumusuporta sa ​200:5 and 1200:5​ ratios sa loob ng iisang CT body.
• ​Adaptability:​​ Software-controlled na ratio selection sa pamamagitan ng MU.
• ​Problem Solved:​​ Automatic na adjustment ng measurement range upang makompleto ang malaking pagbabago sa load (halimbawa, solar farm daylight fluctuations o wind farm cut-in/cut-out) nang walang pisikal na intervention o overdesigned CTs.
2. ​High-Precision Digital Merging Unit (MU)​​
• ​Accuracy:​​ Lumampas sa ​​<0.2S Class​ (ayon sa IEC 60044-1/IEC 61869) para sa parehong revenue metering (ANSI C12.1) at protection functions (IEEE C37.90).
• ​Output:​​ Native ​IEC 61850-9-2 LE​ sampled values sa pamamagitan ng Ethernet.
• ​Calibration:​​ Digital signal processing na nag-compensate para sa phase errors & non-linearity.

​Mga Key Features & Advantages​

• ​Dual-Ratio On Demand:​​ Switch seamlessly between 200:5 (low load/high sensitivity) and 1200:5 (high fault current) via software commands – ​walang rewiring needed.
• ​Substation-Ready:​​ Native digital output (9-2 LE) na direktang nakakonekta sa IEC 61850-based na protection relays, meters, at control systems.
• ​Future-Proof Accuracy:​​ <0.2S accuracy na nagse-set ng compliance sa pinakamahigpit na revenue metering standards at nagbibigay ng high-impedance differential protection.
• ​Robust Outdoor Design:​​ IP67-rated enclosure, UV-resistant polymer housing, at corrosion-resistant materials na nagse-set ng reliabilidad sa harsh environments (-40°C to +70°C).
• ​Reduced Installation Cost:​​ Single CT installation na nagpapalit ng pangangailangan para sa maramihang conventional CTs o burdensome auxiliary units.
• ​Enhanced Grid Stability:​​ Precise, real-time data na nagbibigay ng mas mabilis na protection response para sa fluctuating fault currents (halimbawa, inverter-based resource faults).

​Pagpapatupad: Renewable Energy Use Case​

• ​Scenario:​​ 200 MW Solar/Wind Farm na koneksyon sa 138kV substation. Fault currents na may saklaw mula near-zero (offline inverters) hanggang 30kA+ (full output grid fault).
• ​Challenge:​​ Conventional CTs na kompromiso sa wasto sa low current (200:5 needed) pero saturate sa high fault currents (1200:5 needed).
• ​Aming Solusyon:​​
1. Mag-install ng dual-ratio CTs sa point of interconnection (HV bus/circuit breaker).
2. Sa normal na operasyon (<50% load), MU selects ​200:5 ratio​ – capturing granular data para sa precise energy accounting at flicker monitoring.
3. Kapag may natuklasan na fault (rapid current rise), MU auto-switches to ​1200:5 ratio​ in <5ms – preventing saturation, maintaining accuracy, at enabling relays to clear faults reliably.
4. Sampled values transmitted digitally via 9-2 LE to protection relays, meters, at SCADA – eliminating analog wiring errors at converter delays.

​Bakit Pinapanalunan ng Solusyong Ito​

• ​Eliminates Saturation Risk:​​ Maintains accuracy across 100:1 dynamic range (halimbawa, 30A to 3000A primary).
• ​OPEX Savings:​​ Remote configuration/ratio switching reduces site visits.
• ​Safety Boost:​​ Digital isolation replaces dangerous CT secondary opens.
• ​Data Integrity:​​ Digital output avoids signal degradation from EMI/RFI.
• ​Compliance Ready:​​ Designed to meet IEEE 1547-2018 fault ride-through requirements for renewables.