Partial Discharge
voltage discharge within an insulator causing dielectric breakdown.
See Also: Partial Discharge Detection, Partial Discharge Monitors, PD, PD Test, Partial Discharge Test
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Partial Discharge
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Partial discharge (PD) is a local electrical discharge that occurs in imperfections or inhomogeneities. The partial discharge measurement is a so-called “non destructive test” to determine the quality of insulating materials. On the contrary of pure high-voltage test, th test item is not pre-damaged at low PD levels.
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Partial Discharge Simulation Devices
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Hangzhou Xihu Electronic Institute
Simulation device of cable PD faults, simulation device of switchgear PD faults, simulation device of GIS PD faults, simulation device of transformer PD faults.
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Partial Discharge Testing Equipment
AR700
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PD Defect Location in High-Voltage Equipment Insulation by Acoustic Sensors To act on deteriorating insulation the source of PD must be known.The insulation defects produce partial discharges, which emits electrical impulses, radiation of electromagnetic waves as well as acoustic signals.The AR700 measures acoustic signals with multiple sensors spread over the transformer. Then the software determines the failure location using the time difference of all incoming signals. Finally, these coordinates are shown in a 3D model of the transformer. AR700 device is used for measuring of acoustic signals on the external surfaces of gas-insulated breakers and substations, power transformers and other tank high-voltage equipment. The acoustic signals are caused by partial discharges in the insulation, which is the sigh of the defects.The advantage of “AR700” device is the quick installation of the acoustic PD sensors on the external surface of high-voltage equipment tank. The sensors have magnetic holder that is why there is no need to de-energize the equipment for the sensors installation. “AR700” device has 4 syn-chronic channels for acoustic signal measurement. This gives the possibility not only to find the defects in the insulation, but also to locate them. The location function of the “AR700”device is unique for acoustic devices.
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Portable GIS Partial Discharge Detector
JHPD-10
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Xiamen Jiahua Electrical Technology Co.,Ltd
JHPD-10 quickly and accurately detects various kinds of partial discharge signals that occur with insulation defects in GIS. Attached on the surface of GIS the detector collects the inside discharge signal of impure gas, suspension potential and solid insulation material. The diagnostic software analyzes the fault character and locates the fault to avoid electricity accident. The device is for daily patrol inspection with high efficiency and easy operation features. Designed with two UHF signal channels, one detects the partial discharge signal; another excludes the disturbance signal like corona discharge in the air and mobile phone communication.
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Partial Discharge Detection and Localization System for Power Transformers
AE-150™
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The AE-150™ is designed to detect and localize Partial Discharge activity by correlating acoustic and electric sensors’ data. The AE-150™ has many acquisition modes, each used for detecting and locating Partial Discharge activity in a transformer. The AE-150™ unit is mounted on the transformer tank using its powerful magnets that also hold four acoustic sensors. Acquired data is sent to Mirador-Tx software where all advanced positioning functions are implemented. This cutting-edge software allows easy data interpretation, reporting and monitoring.
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Partial Discharge Test
INDIPORT
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For medium voltage switchgear - partial discharge test in a few minutes - without shutdown.
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TEV Antenna
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TEV sensor is a partial discharge sensor whose working principle is based on a direct Capacitive coupling with a Switchgears earthed metal case. The two ends of TEV sensor can be coupled magnetically to virtually any opening on a metal Surface. It picks up the electric signal given by PD activity onto the two metallic surfaces. Thanks to its special design has high sensitivity, larger than other single ended TEV sensors. His compact and robust design (passive sensor) makes the TEV the optimal sensor for direct installation on medium voltage Switchgears.
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Cable Diagnostic Tools
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For non-destructive diagnostic testing to determine the quality of a cable’s insulation with minimal risk of failure, HVI recommends tan delta and partial discharge testing for valuable diagnostic data about cable insulation integrity. Both use a VLF source to perform elevated voltage, off-line testing. Tan delta testing measures insulation health, while PD identifies specific problem areas and assesses their severity.
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Portable PD Analyzer
AQUILA
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A compact and portable Partial Discharge acquisition unit, which allows to detect and analyze partial discharge activities in all electrical assets: from power cables to transformers, rotating machines and switchgears, together with the right combination of sensors and accessories. AQUILA comes with a full range of options, ideal for field testing.
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PD Measuring System
TEM
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Partial discharge test system for laboratory or on-site measurement according to VDE 0434, IEC 60270 and EN50178 consisting of:*Partial discharge meter TMG*High-voltage coupling capacitors for decoupling of the PD pulses*Partial discharge calibrator TPK for determining the correction factor in the PD test circuit
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Partial Discharge Test Set Up
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This testing set is of great use in industries for various testing applications. We strictly follow all the guidelines while manufacturing this Partial Discharge Test Set Up.
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Field Testing Services
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Power Monitoring and Diagnostic Technology Ltd.
PMDT offers three levels of testing services both domestically in the US and globally. With the best quality products, complete PD solutions, rich on-site testing experience, experienced partial discharge experts and field engineers, PMDT also provides PDExpert Services -- professional on-site partial discharge detection and location services to help the customers find the potential risks, evaluate the operating status of the electrical assets, and deliver complete and final problem solutions.
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Partial Discharge and Tan Delta
PDIX Series
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PDIX is a combined partial discharge and tan delta cable diagnostic testing system. By combining HVI’s VLF products with PDIX products, users can perform VLF AC withstand, partial discharge detection, and tan delta measurement on medium and high voltage cables, rotating machinery, and other apparatus with one integrated package fully supported by HVI & PDIX.
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Partial Discharge Detecting Detectors
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Hangzhou Xihu Electronic Institute
Including pulse current PD detecto, high frequency PD detector, transient earth PD detector, ultra high frequency PD detector, and ultrasonic PD detector.
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Qualification and Quality Control Tests
Techsquare
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New IEC standards, IEC 60034-18-41 and IEC 60034-18-42, have been issued to define the procedures for testing partial discharge inception voltage and the long-term performance (endurance) of Type I and Type II insulation systems used in rotating machines fed from voltage converters. Voltage impulse generators are required at least to test turn insulation, but they would be recommended for any testing under power electronics supply because of their capability to simulate the real electrical stress conditions. More generally, any type of electrical insulation system when subject to impulsive voltage waveform during life should be carefully evaluated in terms of partial discharge and endurance behaviour. This is why voltage impulse generators able to provide impulses with controlled amplitude and frequency are needed to face this new testing challenge.
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Partial Discharge Solutions
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From software systems to hand-held instruments, we’ve developed industry-leading technology to help you keep on top of ageing assets. Spot the warning signs, including partial discharge, to manage maintenance and make timely repairs.
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Portable Partial Discharge/ Detection
AE-150
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The AE-150 is designed to detect and localize Partial Discharge activity inside oil-insulated power transformers. This instrument is a powerful diagnostic tool that combines electric and acoustic sensing technologies to perform partial discharge pinpointing.
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Tan Delta Measurement
TD Series
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While partial discharge measurement is suitable for detecting electrical trees, tangent delta measurement – also referred to as dissipation factor measurement – detects water trees which have formed in the insulation of the device under test.
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Partial Discharge Testing Equipment
3i
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The portable multipurpose 3i device (Intellectual Insulation Indicator) is for eff ective high-voltage equipment insulation monitoring on-line. The 3i device measures and analyses partial discharges (PD). For eff ective PD measurement and noise rejection, there are two types of sensors used in the device: the acoustic sensor and the TEV sensor. Both the sensors are built into the device case, and so do not need any connection cables. The device is supplied in a strong metal case; at the faceplate there are the colored screen and two buttons: power button and function button.
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High Frequency Current Transformer Clamps
HFCT-20HD & HFCT-60HD™
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The HFCT-20HD™ and HFCT-60HD™ are high frequency current transformer sensors designed for partial discharge detection on electric apparatus’ ground returns. Made from superior quality materials, it is designed for any environment.
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Software
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The MSPS Software offers complete remote control of the partial discharge test set TPP.It is built ontop of a powerful database and offers the following possibilities. It is especially designed for use in a continious manufacturing test environment within a quality management system.
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Partial Discharge Detector
PXDP-II
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The PXDP-II partial discharge meter is a portable device that performs detection and measurement of partial discharges in electrical devices or components. It records partial discharge measurements for analysis and diagnosis through the optional PC software. The PXDP-II can be used in various applications and complies with IEC 60270.
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Portable PD Diagnostics System
PD-TaD 60
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The PD TaD 60 portable PD Diagnostics system is used in combination with a BAUR VLF generator frida for carrying out partial discharge measurement and location.* Comprehensive 360° cable analysis – with parallel partial discharge and dissipation factor measurement* Time-optimised and safe cable condition evaluation* The lightest and most compact PD measuring device up to 60 kVpeak* Developed for portable use on site
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Ultrasonic Leak Detection Camera
Leakshooter LKS 1000-V.2
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1st ultrasonic compressed air, gaz and vacuum leak detector with camera. Specialy dedicated to visualize the spots where compressed air is leaking, the LEAKSHOOTER LKS 1000 – V.2 has many other applications such as : steam trap monitoring, bearing monitoring, electrical applications like partial discharge, corona effects, punctured isolators, electrical tracking detection.
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C Series Digitizer Module
Digitizer
The C Series Digitizer Module takes both high-speed and high-resolution time- and frequency-domain measurements. It features up to four channels that can sample at speeds up to 20 MS/s—ideal for discrete detection of signals 10 MHz and smaller for applications such as fault detection, partial discharge analysis, and acoustic measurements. The module's store-and-forward architecture allows up to 128 Mbits of measurement data to be sent back to the CompactRIO Controller and analyzed. You can use the module as part of a CompactRIO system and use the LabVIEW FPGA Module to develop an advanced trigger based on low-speed streaming for added flexibility. This digitizer includes the NI-DAQmx driver and configuration utility that simplifies configuration and measurements. NI-DAQmx supports NI programming environments and Python, ANSI C, C#.NET, and MathWorks MATLAB® software.
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Automation
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The Transformers and measurement capacitors used in high voltage and Partial Discharge test equipment are typically reliable over several decades of continious use. The control technology is however typically obsolete after only 10-15years. MPS offers automated , state-of-the-art High Voltage Testing Equipment with the following features.
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Spiral Antenna
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UHF Spiral antenna is a partial discharge sensor designed to receive electromagnetic (EM) emissions from a PD occurring in the monitored asset. It is a broadband antenna with a flat response which makes Spiral antenna suitable in a number of different applications. It has been optimized to operate in a frequency range typical for PD activity and it was designed to provide maximum sensitivity and high gain.
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Conventional Power Supply Design with Simple Analog Controls
VLF Series
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VLF hipots perform voltage withstand tests and provide the voltage source for diagnostic cable testing. There is no better method for verifying the AC integrity of a cable than applying VLF AC voltage. Tan delta and partial discharge measurement accessories are frequently purchased along with VLF equipment to extend their capabilities.
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Acoustic Imaging
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Acoustic imaging offers cutting-edge solutions for precise leak detection, partial discharge identification, and mechanical fault diagnosis. With high-performance microphone arrays and advanced algorithms, our products ensure exceptional industrial safety and perfomance.
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Sensor Technology
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Power Monitoring and Diagnostic Technology Ltd.
PMDT is the only manufacturer to utilize all 5 types of online partial discharge sensor technology. Using multiple sensing methods ensures that PD activity is always discovered, located, and characterized. PMDT's handheld PDetector and PDStar units have more capability than the high-end diagnostic equipment of the past. The small handheld, battery powered unit can completely perform the test and analysis without the need of a PC. PDetector, PDStar, and PDiagnostic instruments feature high-resolution phase-resolved analysis of PD signals (PRPD and PRPS) in real time, so you get your test results instantly!
