UHF PD Sensor for GIS Testing (300MHz-1500MHz) | MOEORW

 

The MOEORW Cavity-Backed Slot UHF Partial Discharge Sensor is a high-performance, directional antenna specifically engineered for the ultra-high frequency (UHF) radiation measurement of partial discharges in high-voltage assets. Utilizing an advanced cavity-backed resonant slot structure, this premium sensor intercepts electromagnetic wave pulses propagating inside enclosed metal enclosures while isolating external substation background noise. It serves as a core sensory component for intelligent grid diagnostic networks, delivering exceptional signal coupling efficiency through specialized dielectric windows.

 

 

Parameter	Value
Frequency Range	300MHz-1500MHz
Antenna Type	Butterfly
Antenna Gain	≥+5dBi
Impedance	50Ω
Equivalent Height	≥8mm
Operating Temperature	-40℃~+85℃
Protection Level	IP67
Housing Material	Aluminum Alloy
Interface	N-type Connector

 

 

• Superior Interference Rejection: Precision cavity-backed structure delivers a highly directional radiation pattern (Front-to-Back Ratio ≥ 15dB), successfully blocking ambient substation electromagnetic noise.
• Flexible Deployment Options: Available in Flush-Mounted (perfect for tight clearance retrofits on GIS flanges) and Tank Wall Embedded (optimal direct coupling for oil-filled transformers) configurations.
• Accurate Defect Localization: Sharp directional main lobe enables flawless time-of-arrival (TDOA analysis) and amplitude profiling across multiple sensors to pinpoint the exact fault coordinates.
• Compliant Wideband Performance: Operates seamlessly across the 300MHz to 1500MHz spectrum, fully compliant with CIGRE TB 654 and DL/T 846.6 standards.
• Efficient Signal Capture: Achieves high gain (≥ 6dBi) with low voltage standing wave ratio (VSWR ≤ 2.0), guaranteeing optimal power transfer and raw wave integrity for weak PD pulses.
• Substation-Grade Shielding: Features multi-stage RFI countermeasures, a fully shielded housing with conductive gaskets, and integrated output path filtering.
• IP67/IP68 Hermetic Sealing: Built with corrosion-resistant alloy and fully potted electronics to withstand extreme thermal cycling, vibration, and continuous oil/gas pressure.

 

 

• Strict Standard Compliance: Design and performance are fully verified in accordance with DL/T 846.6 (General Technical Specifications for Partial Discharge Detectors) and CIGRE TB 654 (UHF PD Detection Application Guide for GIS).

• 100% Individual Sweep Testing: Every single unit undergoes a meticulous full-band frequency sweep (300MHz–1500MHz) using a calibrated Vector Network Analyzer (VNA).

• Traceable Test Reports: Individual, serialization-matched factory test reports are enclosed with every shipped unit, including actual measured plots for VSWR, antenna gain, and front-to-back ratio.

• Severe Thermal Endurance: Each production batch is subjected to a rigorous 48-hour thermal cycling test (-40°C to +85°C) to guarantee zero component drift under extreme climate variations.

• Hermetic Sealing & Salt Spray Proof: Ingress protection (IP) sealing is strictly verified per batch, with housing materials passing a ≥ 168-hour neutral salt spray (NSS) corrosion test for marine and industrial substation environments.

• ISO 9001:2015 Certified Manufacturing: Produced in a world-class facility operating under a fully certified ISO 9001:2015 Quality Management System.

• Third-Party Lab Verification: Independent performance validation and calibration certificates from ISO/IEC 17025 accredited third-party laboratories are available upon contract request.

 

 

Gas Insulated Gear (GIS) & GIT

Recommended Mounting: Flush-mounted externally on the dielectric window of spacer insulator flanges.

Detection Targets: Free metallic particles, needle protrusions, floating potential electrodes, and internal void discharges within epoxy insulators.

 

Oil-Immersed Power Transformers

Recommended Mounting: Tank wall embedded or flush-mounted directly onto the inspection port/hatch covers.

Detection Targets: Oil-paper insulation degradation, localized winding layer/turn PD, and internal high-voltage bushing tap discharges. 

 

High-Voltage Switchgear & Ring Main Units (RMU)

Recommended Mounting: Flush-mounted flush with the cable compartment walls or busbar chamber enclosure surfaces.

Detection Targets: Internal destructive arcing, cable termination tracking, and multi-phase busbar insulation breakdown defects.

 

Power Transformers with Metal-Tank Construction

Recommended Mounting: Flush-mounted on non-magnetic dielectric window plates integrated along the tank wall surfaces.

Detection Targets: Core grounding faults, surface tracking, and all bubble/void-induced PD types inside oil-filled transformer compartments. 

 

Cable Terminations & GIS-Cable Interfaces

Recommended Mounting: Flush-mounted in close, immediate proximity to cable sealing ends and interface joints.

Detection Targets: Cable accessory insulation slip, internal void formation, and severe interface tracking between the GIS and cross-linked cable terminations.

 

 

We deliver flexible, highly engineered custom hardware modifications for power system integrators, online monitoring equipment OEMs, transformer manufacturers, and utility research institutions:

RF Output Connectors: Precision termination options available in standard N-type, SMA, TNC, or heavy-duty 7/16 DIN (Male/Female) to seamlessly match your backend diagnostic hardware.

Mechanical Flange Dimensions: Fully customized mounting bolt-hole patterns, flange pitch diameters, and specialized groove configurations to guarantee a perfect leak-proof seal with proprietary equipment-specific mounting pads.

Cavity Depth Tuning: Resonant cavity depth and slot geometry can be precision-tuned to adapt to specialized wall thicknesses and internal clearances in tailored embedded tank installations.

Advanced Housing Materials: Select from Lightweight Aluminum Alloy (for portable/temporary gear), Marine-Grade Stainless Steel 316L (for offshore/corrosive environments), or Coated Cast Aluminum.

Turnkey RF Cable Assemblies: Custom-length, low-loss double-shielded coaxial cable assemblies supplied with factory-crimped, certified connector terminations.

White-Label & Branded Packaging: Flexible branding options including neutral packaging, client-branded product labeling, customized manuals, and specialized industrial cartons.

Flexible MOQ & Agile Lead Times: Minimum Order Quantities (MOQ) and production lead times for tailored custom designs are optimized per project. Please consult our sales engineering team for a rapid feasibility analysis.

 

 

Because partial discharge monitoring environments vary strictly by mechanical dimensions and asset types, our engineering team provides 100% personalized selection and hardware tailoring for every project.

To help us configure the optimal sensor for your system, please review the checklist below and include these details in your inquiry:

1. Primary High-Voltage Asset Type: Specify whether the sensor will be deployed on a Gas Insulated Switchgear (GIS), an Oil-Immersed Transformer, or a Medium-Voltage Switchgear/RMU.

2. Mechanical Installation Form Factor: Let our engineers know if your project requires an external Flush-Mounted attachment (on dielectric windows/spacer flanges) or an internal Tank Wall Embedded integration.

3. RF Coaxial Interface Preference: State your standard instrument connection type (SMA, N-Type, or TNC). 50Ω matched low-loss RF cable assemblies can be factory-bundled in custom lengths upon request.

4. Substation Environmental Demands: Inform us if the deployment site requires specialized Marine-Grade Stainless Steel 316L housings or an upgrade to pressure-sealed IP68 hermetic protection for direct oil immersion.

 

 

 

 

 

Click the Inquiry Button: Click [ Request a Quote ] or email our technical sales team directly.

Share Your CAD/Mechanical Drawings: For custom flange pads or custom bolt-hole patterns, sharing a simple mechanical dimensions drawing will accelerate our design analysis.

Receive Engineering Feedback: Our engineering team will return a certified custom design draft and detailed quotation within 12 to 24 hours.