HF-T-603 Transformer Partial Discharge Online Monitoring Device

Transformer Partial Discharge Online Monitoring Device Overview

The Transformer Partial Discharge Online Monitoring Device is designed to continuously monitor partial discharge activity inside transformers. It collects partial discharge signals through sensors and analyzes the type, intensity, and trend of discharge in real time, helping operators identify potential insulation problems before they develop into faults. The device operates continuously without requiring a power outage, making it suitable for online condition monitoring of substations, distribution rooms, and other critical transformer assets.

Key Features of the Transformer PD Monitoring Device

Multi-technology Anti-interference

Integrated with multiple interference suppression technologies to filter out interfering signals and guarantee accurate monitoring data.

Real-time Comprehensive Analysis

Performs real-time comprehensive analysis on partial discharge signals, including time-domain, frequency-domain and time-frequency analysis, as well as multi-channel waveform correlation and expansion analysis. It generates statistical analysis of PRPD and PRPS patterns to improve fault diagnosis accuracy.

Multi-sensor PD Detection and Defect Location

Supports multi-channel signal monitoring of high frequency, ultrasonic and UHF signals. Defect positions are determined through joint analysis of electrical and acoustic signals.

Multi-sensor PD Detection and Defect Location

Multiple online partial discharge monitoring methods are adopted to rapidly capture transient faults of transformers.

Integrated Design

Highly integrated all-in-one structure delivers stable and reliable performance. Compact and lightweight with built-in shock absorbers inside the cabinet to enhance internal equipment stability and shock resistance.

PD Detection Technologies

The HF-T-603 supports high-frequency, UHF and ultrasonic partial discharge detection. Different sensor configurations can be selected according to transformer structure, installation conditions and site interference.

• HF → electrical PD signal acquisition
• UHF → high-frequency electromagnetic PD detection
• Ultrasonic → acoustic signal detection and localization

Main Performance Parameters Table

Category	Parameter	Technical Index
Ultrasonic	Sensor Peak Sensitivity	≥70dB(V/(m/s))
	Sensor Average Sensitivity	≥60dB(V/(m/s))
	Detection Frequency Band	20kHz~200kHz
	Detection Sensitivity	≤40dB
	Dynamic Range	≥60dB
	Linearity Error	≤10%
High Frequency	Detection Frequency Band	100kHz~100MHz
	Transmission Impedance	≥16mV/mA (within 3MHz~30MHz frequency band)
	Lower Limit of Measurable Discharge Capacity	≤1pC
	Output Impedance	50Ω
	Output Mode	BNC Output
Ultra High Frequency (UHF)	Detection Frequency Band	300MHz~2GHz
	Amplitude-Frequency Characteristic	Average effective height ≥15mm within 300MHz~1500MHz frequency band
	Detection Sensitivity	≤2V/m
	Dynamic Range	≥60dB
General Technical Specifications	Measurement Channels	6 independent measurement channels (freely combined with High Frequency, Ultrasonic, UHF)
	Synchronization Mode	External synchronization, frequency range: 50~500Hz
	Electromagnetic Compatibility (EMC)	Meets Level 4 requirements of power system
	Interfaces	RJ45 (optical or electrical port), RS232, RS485, USB
	Supported Protocol	Standard RTU Protocol
	Power Supply	AC 85-260V or DC 100V-300V
	Power Consumption	20W

Where HF-T-603 Is Use

1. HV/EHV Substation Transformers

High-voltage and extra-high-voltage substation transformers are critical assets where insulation failure can cause widespread outages. The HF-T-603 provides continuous PD monitoring to support early fault detection and condition assessment.

2. Wind and Solar Booster Transformers

Renewable energy booster transformers often operate under variable load and harsh environmental conditions. Online PD monitoring helps operators track insulation health and schedule maintenance without unnecessary downtime.

3. Industrial Power Transformers

Industrial facilities rely on power transformers for continuous production. The HF-T-603 helps maintenance teams detect developing insulation problems before they lead to unplanned shutdowns.

4. Aging Transformer Monitoring

For transformers approaching or exceeding their design life, online PD monitoring provides valuable data on insulation degradation trends, supporting decisions on continued operation, maintenance, or replacement.

5. Remote and Unattended Substations

Remote and unattended substations lack regular on-site inspection. The HF-T-603 enables continuous PD monitoring and remote data access, allowing operators to detect abnormal conditions without visiting the site.

6. Condition-Based Maintenance Programs

Utilities and asset owners moving from time-based to condition-based maintenance can use the HF-T-603 as part of a broader monitoring strategy. Continuous PD data supports prioritization of maintenance activities based on actual transformer condition.

Installation and Commissioning

1. Site Survey: Confirm electromagnetic environment and sensor positions, adopt non-power-cut non-destructive construction to avoid affecting substation operation.
2. Sensor Layout: Fix HF clamp sensors on grounding downleads, UHF sensors on oil drain valves, ultrasonic sensors on tank surface; no transformer structural modification needed.
3. Equipment Wiring: Wall mount the main unit next to control cabinets, lay shielded coaxial cables along cable trays with shielding treatment.
4. Debugging: Power on for signal checking, interference suppression, threshold setting and multi-channel synchronization calibration.
5. Platform Access: Connect to user operation platform via Ethernet after protocol matching to realize remote viewing and alarm push.
6. Acceptance & Delivery: Train on-site staff, deliver technical documents and finish project acceptance.

Non-Intrusive Online Installation

The HF-T-603 is designed for non-intrusive online installation, allowing the transformer to remain energized throughout the entire installation process. No shutdown is required, and no internal modification to the transformer is needed. This makes it suitable for existing transformers as well as retrofit projects, where minimizing downtime and avoiding disruption to normal operations are key requirements.

Why Choose This Transformer PD Monitoring Device?

We supply transformer partial discharge online monitoring devices and support project-based configuration, installation, commissioning and technical coordination.

If you would like to know how to choose a partial discharge (PD) monitoring device for power transformers, please click here.

FAQ

Q1. Can the transformer remain energized during installation?

Yes. The HF-T-603 uses non-intrusive online installation. The transformer remains energized, no shutdown is required, and no internal modification is needed.

Q2. What types of transformers can the HF-T-603 monitor?

It is suitable for HV/EHV substation transformers, wind and solar booster transformers, industrial power transformers, aging transformers, and transformers at remote or unattended substations.

Q3. Which PD sensors does the device support?

It supports high-frequency (HF), UHF, and ultrasonic partial discharge sensors. Different configurations can be selected based on transformer structure, installation conditions, and site interference.

Q4. How many monitoring channels are available?

Multiple channels are available, allowing simultaneous monitoring of different sensor inputs for broader coverage and more reliable PD detection. The exact channel count depends on the selected configuration.

Q5. Can the device connect to an existing substation monitoring platform?

Yes. The device can integrate with substation monitoring platforms, allowing PD data and alarms to be viewed alongside other substation information for centralized management.

Q6. Can the sensor configuration be customized?

Yes. Sensor types and configurations can be selected according to transformer type, installation conditions, and site interference to meet specific project requirements.

Q7. What testing and calibration are performed before delivery?

Each device is tested and calibrated before delivery to ensure measurement consistency and reliable field performance.

Q8. What information is required to configure a PD monitoring solution?

Typical information includes transformer type and voltage level, installation location, site conditions, existing monitoring infrastructure, communication requirements, and the specific PD monitoring objectives. This helps determine the appropriate sensor configuration and system setup.