Isang Direkta na Solusyon sa Pagpapalit para sa Modernisasyon ng Legacy AIS

2yrs + staff 1000+m² US$300,000,000+ China

Paglalapat ng Pangunahing Buod: Nasa harap mo ang pagtanda ng mga tradisyonal na Current Transformers (CTs) at Voltage Transformers (VTs) sa Air-Insulated Substations (AIS)? Ang modernisasyon ay hindi nangangahulugan ng pagbabago ng buong substation. Ang CIT (Combined Instrument Transformer) ay in disenyo bilang isang matibay at direktang palit para sa iyong mga dating unit. Ito ay nagpapanatili ng umiiral na pundasyon at koneksyon ng busbar, nagbibigay ng kailangan na analog compatibility ngayon habang nagbibigay din ng makinis na digital na hinaharap. Binibigyang prayoridad ang ruggedness at field-proven na reliabilidad, ito ay nagtataguyod ng tiwala sa pagpalit ng naitatag na teknolohiya.

Ang Hamon: Modernisasyon ng Matatanda na AIS Infrastructure
Ang mga asset ng AIS ang puso ng global na transmission at distribution networks. Libu-libong lugar ang umiiral na nakasalalay sa dekadang lumang CTs at VTs na malapit nang maabot ang end-of-life. Ang pagpalit sa kanila ay nagbibigay ng mga unique na hamon:

Mataas na Gastos ng Structural Change: Ang pagwasak ng pundasyon, pagbabago ng busbar, o paglalawak ng istraktura ay napakamahal at mapagturukan.
Relay Compatibility Dependency: Ang mga critical na protection at metering schemes ay nakadepende sa naitatag na 5A/1A at 110V/100V analog inputs.
Migration Strategy: Ang immediate wholesale replacement ng may digital-only solutions ay madalas hindi praktikal; ang phased approach ay mahalaga.
Trust Hurdle: Ang legacy CTs/VTs ay may proven track record. Ang bagong teknolohiya ay kailangang ipakita ang katulad na reliabilidad sa harsh na field conditions upang makamit ang pagtanggap.

Direktang Palit, Dual Outputs, Proven Reliability
Ang CIT na ito ang sagot, na idisenyo mula sa ground up bilang direktang, retrofittable upgrade para sa conventional CTs at VTs sa AIS environments:

Direkta "Drop-In" Retrofit Design (Core Enabler):

Precision Footprint Matching: Ang dimensyon at masa ay in disenyo upang perpektong magreplicate ng orihinal na CT/VT units na papalitan.
Identical Mounting & Busbar Interfaces: Gumagamit ng umiral na foundation bolts at nagmimatch sa umiral na busbar tap dimensions/configurations (halimbawa, clamp type, bolt holes). Walang kinakailangang pagputol, pagweld, o pagbabago ng busbar.
Standard Terminal Box Placement: Ang secondary connections ay natatapos sa mga lokasyon na kilala ng mga technician, na naka posisyon tulad ng orihinal.
Significant Installation Advantages:

Radically Reduced Downtime: Ang installation windows ay bumababa mula sa mga araw hanggang oras.
Eliminated Civil Costs: Iniiwasan ang concrete work, structural modifications.
Minimized Risk: Simplified engineering, mas simple na lift plan, binabawasan ang potential para sa mga error sa busbar work.

Hybrid Output System: Supporting Today & Tomorrow:

Legacy Analog Interface:

Current Outputs: Standard burden-compatible outputs: 1A (5VA typical) at 5A (15VA o 30VA typical) bawat protection/metering core.
Voltage Outputs: Standard ratio-compatible outputs: 100V (Line-Neutral) at 110V (Line-Neutral), suitable for relays and meters. 110V (Line-Line) option available where required.

Modern Digital Interface:

Standards-Based: Digital output compliant with IEC 61850-9-2LE Sampled Values (SV) over Ethernet.
Advanced Capabilities: Provides merged, synchronized, high-resolution sampled current and voltage data, enabling new possibilities for protection, control, and condition monitoring within digital substation architectures.

Phased Migration Pathway: Utilities can:

Phase 1: Connect existing analog protection/control systems to the CIT. Critical functions remain unchanged.
Phase 2: Route the digital SV stream to new Intelligent Electronic Devices (IEDs) or gateways for advanced applications or new bays.
Phase 3: Gradually decommission legacy IEDs as digital systems prove reliable, minimizing risk and spreading investment.

Ruggedized Design for Proven Field Reliability (Building Trust):

Extreme Environment Ready: Components selected and sealed to withstand temperature extremes (-40°C to +70°C operational), high humidity (IP67 ingress protection standard), salt fog (C5-M corrosion resistance), and severe pollution levels.
Seismic Performance: Designed to meet IEC 61869/IEEE C37 seismic requirements suitable for the installation zone.
Advanced Insulation System: Utilizes solid core insulation (e.g., SF6-free dry design with silicone shed composite housing, or SF6 gas) optimized for stability and long life under switching surges and temporary overvoltages (TOVs).
Thermal & Overload Stability: Generously rated primary conductors and secondary windings ensure performance under fault conditions and overload scenarios. Proven thermal stability test compliance.
Reliability by Design: Employs robust sensor technology (e.g., optimized Low-Power Coreless CTs/LPCTs, resistive/capacitive voltage dividers) with minimal active electronics. Focus on simplicity in critical paths.
Validation Focus: Extensive type testing (IEC 61869, IEEE C57.13) plus rigorous pre-deployment pilot testing in actual grid environments under varied operating conditions to build utility confidence and demonstrate operational equivalence to legacy technologies.

Technical Specifications Overview:

Feature	Specification
Primary Voltage	Matched to existing application (e.g., 72.5kV - 550kV)
Primary Current	Matched to existing busbar rating
Analog Outputs	1A/5A CT Cores, 100V/110V VT Outputs (Std ratios)
Digital Output	IEC 61850-9-2LE SV over Fiber/Ethernet
Accuracy (Analog)	Typically 0.2 / 5P for VT, 5P / 5TPE for CT cores
Accuracy (Digital)	Typically Class 0.2 (Meas), 5TPE (Prot)
Environmental	-40°C to +70°C Ambient, IP67, C5-M Corrosion Res.
Seismic	Zone 3 / Zone 4 per IEEE 693
Standards	IEC 61869, IEEE C57.13, Local Utility Standards

Value Proposition: Reducing Risk & Cost for Grid Operators

Radically Lower Installation Cost & Time: Eliminates structural modifications and complex busbar work. Commissioning faster.
De-risked Modernization: Maintains compatibility with existing, trusted protective relaying during transition. Proven analog reliability.
Future-Proof Investment: Built-in digital capabilities ensure readiness for digital substations without immediate obsolescence.
Enhanced Resilience: Rugged design offers longevity comparable to conventional CTs/VTs, minimizing future replacement cycles.
Reduced Substation Footprint: Replaces two conventional devices with one, improving buswork clarity and freeing space.
Unified Data Source: Single device provides synchronized current and voltage data, improving measurement correlation and enabling advanced analytics.