Hulubisho la Mabadiliko kwa Mipango ya AIS za Kale kwa ajili ya Usimamizi wa IEE-Business
Muhtasari wa Umma: Unakutana na Current Transformers (CTs) na Voltage Transformers (VTs) za kale katika Air-Insulated Substations (AIS)? Modernization haipatikani kwa kubuni upya substation. CIT (Combined Instrument Transformer) imeundwa khusa kama replacement yenye nguvu, ambayo inaweza kuwekwa moja kwa moja kwenye vifaa vyenye historia yako. Inafanikiwa kuhifadhi msingi na majukumu ya busbar zinazopo, inatoa ufanisi wa analog muhimu leo hii na kushughulikia digital future yako ya kifupi. Kupitia kutoa nguvu na imani iliyotathmini, inajenga imani ya kubadilisha teknolojia zinazopo.
Changamoto: Modernizing Mature AIS Infrastructure
Vifaa vya AIS vinavyoform the backbone ya mtaa wa global transmission na distribution. Alfani za maeneo yanatumia CTs na VTs zinazopo zinazokuwa karibu na mwisho wa miaka. Kuirekebisha zina changamoto unikazi:
- Gharama Kubwa ya Mabadiliko ya Msingi: Kugoroga msingi, kubadilisha busbars, au kuongeza structures ni gharama sana na inayoharibu.
- Ushirikiano wa Relay: Mbinu muhimu za protection na metering zinategemea analog inputs zenye 5A/1A na 110V/100V.
- Mtaa wa Migration: Kurekebisha wholesale kwa digital-only solutions mara moja ni ishara ya kukosa ufanisi; mtaa wa kifupi unahitaji.
- Hurdle ya Imani: CTs/VTs zinazopo zina rekodi mzuri. Teknolojia mpya lazima zirudishe ufanisi sawa kwenye masharti magumu ya ground ili kupata ushirikiano.
Replacement Direct, Dual Outputs, Proven Reliability
Hii CIT ni jibu, limeliundwa kutoka chini kwa juu kama upgrade retrofittable direct kwa CTs na VTs traditional katika mazingira ya AIS:
- Direct "Drop-In" Retrofit Design (Core Enabler):
- Precision Footprint Matching: Dimensions na uzito wameliundwa kufanikiwa kwa kutosha kwa vitu vilivyopo vya CT/VT vinavyobadilishwa.
- Identical Mounting & Busbar Interfaces: Hutiliza bolts za msingi wa kwenda na wanamtambua dimensions/configurations za busbar tap za kwenda (mfano, aina ya clamp, bolt holes). Hakuna cutting, welding, au mabadiliko ya busbar yanayohitajika.
- Standard Terminal Box Placement: Secondary connections hutumia maeneo familia kwa technicians, yanapozunguka kama originals.
- Significant Installation Advantages:
- Radically Reduced Downtime: Windows za installation zinadondoka kutoka days hadi hours.
- Eliminated Civil Costs: Husaidia concrete work, mabadiliko ya structure.
- Minimized Risk: Engineering rahisi, lift plan rahisi, uhalifu mdogo wa makosa wakati wa kazi ya busbar.
- Hybrid Output System: Supporting Today & Tomorrow:
- Legacy Analog Interface:
- Current Outputs: Standard burden-compatible outputs: 1A (5VA typical) and 5A (15VA or 30VA typical) per protection/metering core.
- Voltage Outputs: Standard ratio-compatible outputs: 100V (Line-Neutral) and 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.
07/22/2025
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