Table of Contents

Overview

The cable temperature online monitoring system is core safety early-warning equipment for power transmission and distribution scenarios. It delivers 24/7 uninterrupted real-time surveillance on overheating risks at key positions including high-voltage cables, cable joints, cable trenches and cable branch boxes.

Traditional manual patrol inspection suffers from low efficiency and limited coverage, failing to capture hidden early temperature rise risks. Gradual cable insulation aging and poor contact will easily trigger overheating and even fire accidents. Centered on high-performance microprocessors, equipped with high-precision sensing modules and intelligent data forwarding units, the system runs stably in harsh environments featuring high temperature, high humidity and strong electromagnetic interference. It identifies abnormal temperature rising trends in advance, cuts down failures and fire hazards of power equipment fundamentally, and guarantees safe power operation for power grids, industrial plants, rail transit and other facilities.

Product Description

The complete system consists of three parts: wireless temperature acquisition terminals, communication management concentrator and intelligent background monitoring software platform.

Adopting battery-powered low-power design, the acquisition terminals are fitted with fully sealed waterproof contact sensors. Sensors are closely attached to cable joints and cable bodies for temperature collection without extra field wiring. The communication concentrator supports dual-mode Zigbee & GPRS wireless transmission; one single concentrator can connect up to 256 acquisition terminals, and each terminal collects 4 channels of temperature data (1 channel reserved for ambient temperature reference), greatly reducing on-site network deployment costs.

The system adopts periodic data uploading under normal temperature conditions, and automatically switches to real-time transmission once abnormal temperature surge occurs. It also embeds battery self-check function for terminals; low battery reminders will be actively pushed to avoid blind monitoring.

The background platform supports visual temperature distribution display and automatically generates historical temperature rise curves & statistical reports. Users can customize over-temperature alarm thresholds. Once thresholds are exceeded, alarms will be issued through screen color reversal, on-site audible & visual alerts, SMS notifications and other ways simultaneously. The system replaces manual inspection to realize unattended intelligent remote temperature management.

Core Technical Specifications

Parameter Items	Technical Indicators
Temperature Measuring Range	-55℃ ~ +125℃; customized expansion to -55℃ ~ +200℃ available for special applications
Full-range Temperature Accuracy	±0.5℃; temperature resolution: ±0.1℃
Maximum Capacity per Concentrator	256 acquisition terminals; 4 temperature channels per terminal
Wireless Transmission Modes	Zigbee self-organizing network, GPRS/4G long-distance transmission; LoRa version supports 10km transmission distance
Sensor Ingress Protection	IP66, resin sealed for waterproof, dustproof & moisture-proof; withstands ESD ±10000V high voltage surge
Communication Interface	Standard RS485 port; compatible with Modbus RTU, IEC 61850 protocols for seamless docking with existing SCADA systems
Terminal Battery Lifespan	≥5 years under normal operating conditions
Alarm Response Time	Data transmission delay ＜2s under abnormal status; multi-level customizable alarm thresholds
Operating Environment	-25℃ ~ +80℃, relative humidity ≤95% (non-condensing), stable long-term operation

Main Applications

Widely deployed in power plants, substations, urban rail transit, chemical industrial parks and large data centers, the system monitors key power facilities: cable trenches, cable tunnels, HV cable terminals & intermediate joints, ring main units, cable branch boxes, transformers and high-voltage switchgears.

Apart from basic temperature monitoring, the system can access smoke detectors, water immersion sensors and other environmental detectors to build comprehensive environmental safety monitoring for cable tunnels. Long-term historical temperature data helps maintenance crews analyze cable insulation aging trends and formulate maintenance schedules in advance. It effectively lowers the occurrence of power outages and fires caused by cable overheating, and reduces economic losses from unplanned power shutdowns.

Standard Packing List

Wireless temperature acquisition terminals: Quantity matched with measuring points stipulated in contract, with waterproof mounting accessories
Communication management concentrator ×1, equipped with power adapter and mounting bracket
High-precision contact temperature sensors: Quantity consistent with acquisition terminals, with high-temperature resistant fixing cable ties
Installation CD for intelligent monitoring background software: including operation manual & activation authorization code
Supporting communication antennas: 1 piece each for concentrator and acquisition terminal
Installation auxiliary kit: RS485 communication cables, waterproof terminals, expansion bolts and other fittings
Product certificate, factory test report and copy of 3C certification (one set each)

FAQ – Cable Temperature Online Monitoring

Q1. What is Cable Temperature Online Monitoring?

A1. It is a 24/7 real-time monitoring solution for power cables, joints, trenches and switchgears. It provides accurate over-temperature early warnings to prevent insulation aging, equipment overheating and cable fire hazards.

Q2. What wireless transmission methods does the system support?

A2. It supports Zigbee self-networking and 4G/GPRS remote transmission. The optional LoRa module achieves ultra-long transmission distance up to 10 km for large-scale cable tunnels.

Q3. Does the sensor require on-site wiring or power supply?

A3. No external wiring is required. All sensors are battery-powered and wireless, supporting fast installation without power outage and no impact on existing power systems.

Q4. What is the battery life of the wireless temperature terminal?

A4. Adopting low-power design, the sensor battery lasts more than 5 years under normal operation, with automatic low-battery reminder to avoid monitoring failure.

Q5. What is the system temperature measurement accuracy?

A5. It achieves ±0.5℃ full-range accuracy and 0.1℃ high resolution, capturing subtle temperature changes and early hidden overheating faults.

Q6. Is the equipment suitable for harsh underground and outdoor environments?

A6. Yes. IP66 waterproof and dustproof sensors adapt to high humidity and dusty conditions. The system stably operates from -25℃ to +80℃ with strong anti-interference capability.

Q7. What alarm methods are available for over-temperature faults?

A7. It supports multi-level customizable temperature thresholds, with audible and visual alarms, platform pop-up reminders and SMS remote notification for fast fault response.

Q8. Can the system connect to existing SCADA and grid platforms?

A8. Yes. It supports Modbus RTU and IEC 61850 standard protocols, enabling seamless integration with mainstream power monitoring systems and smart grid platforms.

Q9. How many monitoring points can a single concentrator support?

A9. One concentrator can connect up to 256 wireless terminals, and each terminal supports 4 temperature channels, meeting large-area cable monitoring requirements.

Q10. What application scenarios is this system suitable for?

A10. It is widely used in substations, cable tunnels, rail transit, chemical parks and data centers for real-time temperature monitoring of HV cables, joints and power distribution equipment.

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