GDPD-PTU Online PD Monitoring System | Partial Discharge Detector for Power Transformers

Core Monitoring Objects

· Oil-immersed power transformers in power transmission and distribution grids

· Generator step-up (GSU) transformers in thermal, hydro, nuclear, and renewable energy power plants

· Industrial distribution transformers in petrochemical, steel, mining, and manufacturing facilities

· Traction transformers for high-speed railway and urban metro transit systems

· Converter transformers for HVDC transmission projects

· Oil-immersed shunt reactors in power grids

Industry-Specific Usage

· Electric Power Utilities: 24/7 monitoring of substation main transformers, predictive maintenance, and insulation condition assessment for transmission and distribution assets

· Power Generation Plants: Continuous PD monitoring of GSU transformers and station service transformers, preventing unplanned generation outages

· Industrial & Petrochemical: Condition monitoring of critical power transformers in high-reliability production facilities, avoiding costly production downtime

· Rail Transit & Urban Infrastructure: PD monitoring of traction transformers in metro and high-speed railway systems, ensuring safe and uninterrupted operation

· Data Center & Critical Infrastructure: Continuous insulation condition monitoring of power distribution transformers for mission-critical facilities

· Third-Party Testing & Service Providers: Long-term PD monitoring and diagnostic services for industrial and utility clients

Strict Global Transformer PD Standard Compliance

Fully designed, calibrated, and tested in accordance with IEC 60270 (PD measurement general standard), IEC 60076-3 (power transformer insulation requirements), IEEE C57.113-2023 (PD measurement for liquid-filled transformers), and ISO 18095 (transformer condition monitoring) international standards. Monitoring data is globally recognized, meeting the requirements of grid operation, equipment certification, and industrial safety regulations.

Transformer-Specific Multi-Sensor Fusion Design

Unlike single-function PD monitors, the GDPD-PTU integrates three complementary sensing technologies optimized for oil-immersed transformers. UHF for ultra-high sensitivity early defect detection, HFCT for IEC-standard apparent charge measurement, and AE for precise PD source localization. This multi-dimensional detection ensures no PD event is missed, delivering comprehensive insulation condition assessment.

Non-Intrusive Outage-Free Installation

All sensors adopt non-intrusive installation design, with no need for transformer power shutdown, no modification to the transformer tank or internal structure, and no impact on the normal operation of the transformer. This eliminates the need for costly outages during installation and maintenance, making it ideal for both new and in-service transformers.

Superior On-Site Anti-Interference Performance

Multi-stage advanced digital anti-interference algorithms, combined with multi-sensor data cross-validation, effectively suppress on-site electromagnetic and mechanical noise in harsh substation environments. This ensures accurate PD measurement even in high-interference industrial sites, without the need for a dedicated shielded room.

Accurate PD Localization & AI Defect Diagnosis

AI-powered defect type recognition automatically identifies the root cause of PD events, while the TDOA acoustic localization algorithm precisely pinpoints the 3D position of the PD source within the transformer tank. This provides maintenance teams with clear, actionable insights, enabling targeted repairs and reducing maintenance costs and downtime.

24/7 Predictive Maintenance & Risk Mitigation

Continuous online monitoring enables early detection of insulation degradation at its incipient stage, months or even years before a catastrophic failure occurs. This allows operators to implement predictive maintenance, avoid unplanned outages, extend transformer service life, and optimize asset management strategies.

Seamless Substation Automation Integration

Native support for IEC 61850 substation communication protocol, as well as Modbus, MQTT, and other standard industrial protocols, enabling seamless integration with existing SCADA, EMS, and asset management systems. It fits perfectly into smart grid and digital substation architectures, with no need for custom gateway development.

Q: What international standards does the GDPD-PTU system comply with?

A: The system is fully designed, calibrated, and tested in accordance with IEC 60270, IEC 60076-3, IEEE C57.113-2023, and ISO 18095 international standards for transformer partial discharge measurement and condition monitoring. It also natively supports the IEC 61850 substation communication protocol.

Q: Does the installation require a transformer power outage?

A: No. All sensors adopt a non-intrusive, outage-free installation design. UHF sensors are installed via the transformer's oil valve, HFCT sensors are clipped onto the external grounding lines, and AE sensors are magnetically mounted on the tank surface. All installation work can be completed on energized transformers, with no impact on normal operation.

Q: What types of transformer insulation defects can the system detect?

A: The system can accurately detect and identify all common transformer insulation defects, including: internal void discharge in winding insulation, surface discharge along insulating spacers, corona discharge at high-voltage terminals and bushings, floating potential discharge from loose core or clamping components, and insulation degradation caused by oil contamination and aging.

Q: How does the system suppress on-site electromagnetic interference?

A: It adopts multi-stage advanced anti-interference technology, including adaptive digital filtering, 360° phase windowing, pulse shape recognition, power frequency synchronous gating, and multi-sensor data cross-validation. This effectively eliminates on-site electromagnetic and mechanical noise, ensuring accurate PD measurement even in harsh substation environments.

Q: Can the system locate the internal PD source in the transformer?

A: Yes. The system uses a time-difference of arrival (TDOA) algorithm with the AE sensor array, combined with UHF multi-point synchronous acquisition, to accurately pinpoint the 3D position of the internal PD source within the transformer tank, with a localization error of ≤5cm.

Q: Does it support integration with our existing SCADA system?

A: Yes. The system natively supports IEC 61850 MMS, Modbus-RTU/TCP, Ethernet/IP, and MQTT standard industrial communication protocols, enabling seamless integration with all mainstream substation SCADA, EMS, and asset management systems.

Q: What is the warranty and after-sales support?

A: We provide a standard 2-year whole-system warranty, lifetime technical support, on-site commissioning, and operation training services through our global service network. Extended warranty and annual maintenance plans are available upon request.