IEEE STD 2969-2025 · CIGRE TB 999 · 500 kV TESTED · ZERO BATTERIES

Continuous Thermal Monitoring for High-Voltage Grids

Battery-free wireless sensors harvesting operating power directly from conductor load current (≥ 1 A). 24/7 autonomous contact temperature telemetry for switchgear busbars, power transformers, and 500 kV transmission lines.

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0 Batteries — Current induction powered
±0.2 °C Accuracy (−10 to +65 °C)
500 kV PD 8.7 pC & −1500 kV BIL
Made in Vietnam — Direct manufacturer
Temperature Sensor VTI-TS-22 Yellow Box
Switchgear & RMU

VTI-TS-22

BLE 2.4 GHz · Starts ≥ 1 A

Temperature Sensor VTI-TS-26 Red Box
Outdoor 500 kV & DLR

VTI-TS-26

LoRa Sub-GHz · Up to 3 km

Precision Contact Probe & QR Tag 100% Maintenance-Free (10+ Yr)
0
Batteries Required (Current Harvested)
≥ 1 A
Operating Threshold on Light Feeder
500 kV
Dielectric Tested (PD 8.7 pC < 10 pC)
> 1,000
Sensors Managed per GW22 Concentrator
FIELD-PROVEN WITH LEADING POWER UTILITIES
EVNNPT
EVNNPC
EVNHANOI
PV POWER
Rugged Monitoring
Dynamic Ratings
EVNNPT
EVNNPC
EVNHANOI
PV POWER
Rugged Monitoring
Dynamic Ratings
CONTINUOUS THERMAL MONITORING ECOSYSTEM

VTI Hardware & Software Product Portfolio

High-precision battery-free sensors, dual-band concentrators, and CBM software designed by VTI Corp for national grid utilities under IEEE 2969 and CIGRE TB 999.

Indoor · BLE 2.4 GHz VTI-TS-22 Self-Powered Wireless Temperature Sensor
Model VTI-TS-22

VTI-TS-22 Switchgear Sensor

Self-powered from conductor current ≥ 1 A, 100% battery-free. Direct contact measurement on busbars, circuit breaker tulip contacts, and MV cable terminations ≤ 52 kV.

Temperature Range −40…+125 °C
Measurement Accuracy ±0.2 °C
Self-Powering Start ≥ 1 A Conductor Current
Wireless Protocol BLE 2.4 GHz (~100 m)
High Voltage Withstand 500 kV (PD 8.7 pC)
Technical Specs → Quote
Outdoor · LoRa Sub-GHz VTI-TS-26 Long-Range Self-Powered Wireless Temperature Sensor
Model VTI-TS-26

VTI-TS-26 Outdoor & 500 kV Sensor

Long-range Sub-GHz LoRa transmission up to 3 km, tested at 500 kV with 8.7 pC partial discharge. Engineered for outdoor substation switchyards, transformer bushings, and transmission lines.

Temperature Range −40…+125 °C
Measurement Accuracy ±0.2 °C
Wireless Protocol LoRa Sub-GHz (Up to 3 km)
Enclosure Rating IP68 Weatherproof
High Voltage Withstand 500 kV (PD 8.7 pC)
Technical Specs → Quote
Dual-Band · IEC 61850 Gateway GW22 Industrial Concentrator
Model GW22 / GW22-D

Gateway GW22 Concentrator

Dual-band multichannel IoT concentrator managing over 1,000 sensors. Direct connectivity to SCADA/EMS via Modbus TCP, MQTT over TLS, and IEC 61850 / IEC 60870-5-104.

Sensor Capacity > 1,000 Sensors
RF Bands Dual-Band: 2.4 GHz + Sub-GHz
SCADA Protocols IEC 61850, Modbus TCP, MQTT
Power Supply 85–264 VAC / 24 VDC
Mounting Standard 35mm DIN-Rail
Technical Specs → Quote
Raman OTDR · 20 km Distributed Fiber Optic DTS VTI-GL-100C
Model VTI-GL-100C

Fiber Optic DTS System

Distributed Temperature Sensing (DTS) based on Raman optical time-domain reflectometry measuring continuous thermal profiles across up to 20 km of underground power cables.

Monitoring Range Up to 20 km per Channel
Spatial Resolution 0.5 m (Spot Precision)
Temperature Resolution 0.05 °C
Optical Channels 1, 2, 4, or 8 Channels
Measurement Cycle 1–5 seconds per channel
Solution Details → Quote
Predictive AI · SCADA VTI CBM Thermal Analytics Platform
Software Architecture

CBM / RBM Thermal Platform

Condition-based maintenance platform computing real-time Arrhenius electrical contact degradation kinetics, rate-of-rise thermal alarms, and dispatch integration.

Contact Degradation Arrhenius Rate Analysis
Compliance Standards IEEE 2969, CIGRE TB 999
Alarm Hierarchy 4-Tier Predictive Levels
Deployment Options On-Premise / Secure Cloud
Interoperability REST API, IEC 61850, SCADA
Architecture → Demo
HEAD-TO-HEAD SPECIFICATIONS

Hardware Technical Comparison Matrix

Evaluate parameters to select the optimal sensing modality for your electrical substation or transmission line scope.

Specification Parameter VTI-TS-22 Sensor VTI-TS-26 Sensor Gateway GW22 Fiber DTS VTI-GL-100C
Primary Application Indoor Switchgear & RMU Outdoor 500 kV & Lines Substation Concentrator HV Underground Cables
Power Supply Zero Battery (≥ 1 A Induction) Zero Battery (≥ 1 A Induction) 85–264 VAC / 24 VDC Auxiliary 110/220 VAC Station Supply
Measuring Range −40 °C to +125 °C −40 °C to +125 °C Up to 1,000+ data nodes −40 °C to +150 °C
Accuracy & Resolution ±0.2 °C (Res: 0.1 °C) ±0.2 °C (Res: 0.1 °C) Sub-second telemetry sync ±1.0 °C (Res: 0.05 °C, 0.5 m)
Wireless / Telemetry BLE 2.4 GHz (~100 m) LoRa Sub-GHz (Up to 3 km) Dual-Band BLE + LoRa Reception Raman Optical Backscatter
Dielectric Testing 500 kV (PD 8.7 pC < 10 pC) 500 kV (PD 8.7 pC < 10 pC) IEC 61000-4 EMC Level 4 Optically Isolated Dielectric
Enclosure Protection High-Dielectric V0 Polycarbonate IP68 Weatherproof / UV-Resistant IP30 DIN-Rail Enclosure 19-inch 3U Rackmount Chassis
SCADA / Integration Via GW22 Gateway Via GW22 Gateway IEC 61850, Modbus TCP, MQTT Modbus TCP, IEC 60870-5-104
END-TO-END TELEMETRY PIPELINE

How the VTI Continuous Thermal Monitoring System Works

Structured telemetry workflow from physical contact micro-harvesting to automated SCADA dispatch alerts under IEEE 2969 and CIGRE TB 999.

Step 01 · Induction

Self-Powered Contact Sensing

Sensors clamp directly onto energized copper/aluminum conductors. Miniature current transformers harvest operating energy from ≥ 1 A load current without requiring battery maintenance or outages.

≥ 1 A Magnetic Harvest
Step 02 · RF Mesh

Secure Wireless Telemetry

Encrypted telemetry transmissions over 2.4 GHz BLE (for indoor cubicles) or Sub-GHz LoRa (for 500 kV outdoor switchyards and transmission lines) penetrating metal enclosures reliably.

BLE 2.4 GHz & LoRa 3 km
Step 03 · Hub

Gateway GW22 Concentration

Industrial DIN-rail gateway aggregates over 1,000 thermal data streams simultaneously, caching telemetry locally and mapping channels to IEC 61850, Modbus TCP, and MQTT over TLS.

IEC 61850 & Modbus TCP
Step 04 · Intelligence

CBM Analytics & SCADA Dispatch

Software analyzes temperature differential (ΔT), rate of rise (dT/dt), and Arrhenius contact aging kinetics to predict failures weeks before conventional annual thermography inspections can detect them.

Arrhenius Contact Aging Index
GRID ASSET PROTECTION

Engineered for Critical High-Voltage Electrical Infrastructure

Continuous thermal telemetry tailored for every stage of power generation, transmission, and distribution.

MV/LV Switchgear & RMU Cubicles

Continuous monitoring of bolted busbar joints, disconnector jaws, and breaker tulip contacts inside sealed enclosures where infrared cameras cannot see during operation.

Explore Switchgear Solution →

Substations & Power Transformers

Monitoring bushing clamp palms, neutral ground bonds, and disconnector blade contacts under 110 kV to 500 kV electric fields with zero degradation.

Explore Substation Solution →

Overhead Transmission & Dynamic Line Rating

Real-time conductor thermal telemetry for 110–500 kV lines enabling dynamic line capacity unlocking (DLR) while preventing line sag and thermal overload.

Explore Transmission Solution →

HV Underground Cable Corridors

Distributed Raman OTDR sensing along up to 20 km of underground power cables with 0.5 m spot resolution to detect soil drying and localized hot spots.

Explore Fiber DTS Solution →
FIELD VALIDATION

Proven Reliability Across National Power Grids

Documented field performance and early hotspot detections in operating substations.

EVNNPC 110 kV Substation

Continuous Switchgear Monitoring Pilot

Deployment of 48 VTI-TS-22 sensors across 24 kV outgoing cubicles. Successfully detected a loose bolted cable lug with ΔT = +28 °C above ambient two weeks before planned IR thermography inspection.

Read Full Case Study →
500 kV EHV Substation Yard

Disconnector Blade Hotspot Detection

Deployment of VTI-TS-26 sensors on 500 kV substation disconnector blades. Continuous LoRa transmission across 800 m switchyard with 100% packet arrival rate under 500 kV energized electric field.

Explore Project Gallery →
COMPLIANCE & CERTIFICATION

Engineered Under Global Electrical Standards

Aligned clause-by-clause with international continuous thermal monitoring engineering guidelines.

IEEE Std 2969-2025

Strict alignment with IEEE standard for continuous thermal monitoring of electrical power equipment.

CIGRE TB 999

Complies with CIGRE Technical Brochure 999 Table 2.8-1 criteria for continuous temperature sensor telemetry.

500 kV Dielectric Tested

Type-tested partial discharge of 8.7 pC at 500 kV (below 10 pC limit) and -1500 kV lightning impulse withstand.

100% Domestic Manufacturing

Direct manufacturer based in Hanoi, Vietnam, guaranteeing rapid engineering support, spare parts, and custom fittings.

ENGINEERING KNOWLEDGE

Whitepapers & Engineering Manuals

Technical publications on continuous thermal monitoring, Arrhenius contact kinetics, and NFPA 70B electrical safety.

TECHNICAL WHITEPAPER · 2026

Continuous Thermal Monitoring: IEEE 2969 vs. Infrared Thermography

Analysis of Holm contact resistance, load-dependent temperature fluctuations, and why intermittent thermography misses up to 80% of developing faults.

Read Standard Guide →
ENGINEERING MANUAL

Condition-Based & Risk-Based Maintenance (CBM / RBM)

Engineering methodology for transitioning from time-based calendar inspections to dynamic real-time health index calculations.

Read CBM Manual →
INSTALLATION PROTOCOL

14 Critical Sensor Mounting Locations in Substations

Comprehensive guide on selecting optimal probe contact points across circuit breakers, disconnectors, cable pots, and busbar joints.

View Mounting Guide →
FAST ENGINEERING RESPONSE

Request Quotation & Technical Support

Our application engineers will review your electrical layout, sensor point schedule, and SCADA architecture to provide custom technical proposals and budgetary quotation within 2–4 business hours.

Direct Engineering Inquiries:

Hotline 24/7: +84 985 186 181 / +84 961 637 389

Email: [email protected] / [email protected]