Precise assessment of partial discharge in underground MV/HV power cables and terminations

Transcription

1 QCM-C-PD-Survey Service Partia discharge monitoring for underground power cabes Precise assessment of partia discharge in underground MV/HV power cabes and terminations Highy accurate periodic PD survey of HV/MV power cabes eiminates risk of unpanned outages Precise PD ocaisation (within 0.2% to 1% of cabe ength) minimizes maintenance expenditure Higher ROI by appropriate risk assessment and prioritisation of cabe sections for repair / repacement Onine PD measurement services without disrupting pants or faciities Wordwide presence of engineers provides cost effective and quick PD survey Greater emphasis on heath and safety provides assurances for safe and reiabe surveys of power cabes Product Summary Description Quaitro is a trusted name in providing PD monitoring and anaysis products and services to utiities. Our expert diagnostic and testing services incude the foowing: On-ine PD measurement at HV/MV power cabes PD faut ocaisation within accuracy of 0.2% to 1% of the tota cabe ength Reports on a measurements with expert advice On-site customer training on PD measurement Expert consuting services during acceptance testing and maintenance panning Appication Quaitro provides a arge poo of highy experienced engineers to diagnose and test HV/MV power cabes during: Commissioning and acceptance testing Period onine inspections to assess cabe heath Identifying the faut ocation on weakening cabes Factory acceptance testing

2 QCM-C-PD-Survey Service - Partia discharge monitoring for underground power cabes Precise assessment of partia discharge in underground MV/HV power cabes and terminations. Highy accurate periodic PD survey of HV/MV power cabes eiminates risk of unpanned outages Faiure in cabe insuation is generay preceded by partia discharge and subsequent degradation phase Detecting partia discharge at the eary stage of degradation heps in preventing sudden faiure Quaitro experts make sure that there is no PD in the instaed power cabes Detaied report on power cabe heath assessment with recommended actions HFCTs used in the systems are sensitive to a wide range of frequency (100 KHz MHz) TEV sensors to differentiate between PD and oca discharge (Corona, surface discharge) Advanced de-noising based on proven noise gating technoogy - Waveet Fitering Reports proposing foow-up testing schedue to minimise the risk of cabe faiure Precise PD ocaisation (within 0.2% to 1% of cabe ength) minimizes maintenance expenditure Highy accurate ocation agorithms based on Time Domain Refectometry (TDR) Higher acquisition rate and dynamic threshod seection improves definition on PD events Transponder is used for onger cabes to improve the accuracy of detecting PD ocation aong the ength of cabe More than 25 years of experience in PD anaysis into HV apparatus Higher ROI by appropriate risk assessment and prioritisation of cabe sections for repair / repacement PD trending and other statistica parameters heps in risk assessment of operate vs. repace Environmenta, and economica factors considered whie prioritising the cabe sections for repair / repacements Survey reports provide recommendations for prioritizing repacement or corrective actions Onine PD measurement services without disrupting pants or faciities HFCTs can be camped on the energised cabe earth TEVs can be attached magneticay to the metacad switchgear (even when the cabes are operationa) HFCTs are passive and do not have any impact on the eectric fied of cabe Easy to connect with the data acquisition unit and anaysis system Wordwide presence of engineers provides cost effective and quick PD survey More than 50 fied service staff ocated in a major countries Guaranteed turn around within 2 days PD survey done by engineers who know Engish and oca anguages Onine support by researchers and experts from Quaitro DMS Gasgow Expert power cabe condition asessment...

3 Greater emphasis on heath and safety provides assurances for safe and reiabe surveys of power cabes Other key benefits Separate heath and safety document for PD measurements on-site and at factory Periodic update to heath and safety documents and training to survey engineers Survey does not use any over-votages; hence not exposing the power cabes to higher votage stresses No PD measurement without comprehensive review of ine diagram, physica cabe systems and a safety standards Rugged and reiabe PD monitoring system Superior system protection under high votage conditions Rea-time monitoring of events Why partia discharge measurement in power cabes? Faiure in cabe insuation is generay preceded by a degradation phase which may ast for months or severa years Any insuation degradation resuts in the inception of partia discharges (PD) at degradation site(s) PD anaysis and ocaisation heps in determining the insuation heath and subsequenty the ife of power cabes Why QUALITROL Expert diagnostic and testing services? More than 25 years of experience in providing PD monitoring systems and services to utiities across the word Word wide presence provides quick turn around times Long term serviceabiity assurance heps in formuating onger service contracts Cross team integration increases the accuracy of resuts and confidence of operator / asset manager Highy accurate PD detection and ocaisation system for power cabes Greater emphasis on heath and safety during PD measurements surveys...from the word eader in PDM

4 QCM-C-PD-Survey Service - Partia discharge monitoring for underground power cabes System overview Sensors Data Acquisition Unit Anaysis System Transponder HFCT sensors detect the high frequency signas induced from any PD puse inside the cabe insuation and send to data acquisition unit for further anaysis. TEV sensors are used to detect the corona and surface discharge. It heps in differentiating PD activity inside the insuation from corona and surface discharge The DAU takes the signa from sensors and appies fitering and noise gating to reject interference. The digitised high frequency puse is then sent to the Anaysis System for further anaysis The PD anaysis system determines if the high frequency signa is a PD signa or not. It stores a PD signas with their parameters for trend anaysis. The PD anaysis system aso ocates the faut aong the cabe with an accuracy of ess than 0.2% to 1% of the tota cabe ength The Transponder is used for PD ocaization in cases of ong cabes > 3 km (1.8 mies). It injects the puse back after receiving the actua PD signa in order to make comparison simper for the system Transponder PD anaysis system (instaed in Laptop) Accessories kit The measuring method Quaitro system experts are capabe of detecting and ocating partia discharge in a kind of HV/MV cabes: XLPE, EPR, PVC, PILC, etc. cabe Singe core and muti core cabe Cabes of any ength or any number of joints PD measurements are made using HFCT and TEV/UHF sensors that are camped over the earth screen. HF Signas are captured synchronousy enabing the test engineer to observe phase-reated patterns of discharge, onine and in rea-time The Expert anaysis system provides an automatic PD detection and criticaity eve for the cabe based on magnitude and number of PD puses per power cyce. Quaitro experts and the PD anaysis system together are capabe of differentiating PD activity from externa noise and oca discharges, e.g. corona, surface discharge, switchgear PD, etc The Time Domain Refectometry (TDR) agorithm is used to accuratey ocate the PD to an accuracy of ess than 0.2% to 1% of the cabe ength The Transponder is used at the other end of the cabe section to keep the simiar accuracy of ocaisation in the onger cabe sections (greater than 3 km)

5 PD anaysis system screen A B C A =Main puse B =Mutipe refections from near joint C = Refected puse Time Domain Refectometry (TDR) exampe PD source ocated Site survey and PD measurements The site visit for a PD survey is performed by our highy experienced technica staff. PD measurements are performed ony after reviewing an up-to-date eectrica singe ine diagram and physica checking cabe systems, incuding spices and terminations A PD measurement and anaysis is done as per the test pan aready written for the site Written expert reports are provided after a surveys / PD measurements. The reports typicay contain: Information about the test resuts in the form of PD magnitude, statistica parameters and PD ocation for each cabe The condition of tested cabes and accessories with recommended actions for a Recommendations for prioritizing repacement or corrective actions Proposed foow-up testing schedue

6 QCM-C-PD-Survey Service - Partia discharge monitoring for underground power cabes System components A typica PD survey system consists of: HFCT sensors, one for each power cabe) TEV sensors, one for each metaic cabinet terminating cabes DAU to connect to four sensors Laptop with PD anaysis system instaed Co-ax cabe to connect sensor to DAU Communication cabe to connect DAU to Anaysis System aptop Power cabes to suppy powers to DAU and aptop Optiona components incude: 1 Transponder, when the cabe ength is more than 3 km (1.8 mies) Cabe PD Survey Service Topoogy Location & Faut Detection Processing is performed on remote aptop Transponder assists in faut ocation on ong cabe engths High Speed Digitizer Ethernet Link CT Sensors detects PD puses and transmits HF signas for ocation Co-Axia Sensor Link Co-Axia Sensor Link CT Detection Sensor Attaches to Cabe Earth or Core Cabe Earth Cabe Earth TEV Sensor utiised for detection and remova of externa PD activity Power Cabe Cabe Termination

7 SURVEY EQUIPMENT SPECIFICATIONS PDM system Votage range Suppy power Loca MMI interface Input Surge protection Sampe rate 90 to 264 V AC; 47 to 63 Hz 70 W Software instaed on Laptop 1 to 4 channes (can take output from HFCT, TEV, Noise Antenna) >90 V 2500 KS/s per channe Transponder Input Output Modes of operation Power 1 Channe (captured PD puse >15 mv from HFCT) Two outputs: HV puse: 180 V (out into HFCT) Trigger Puse: 5 V Free running mode and trigger mode Rechargeabe battery, runs for 8 hours HFCT sensors Mounting Output Bandwidth Sensitivity Camped around cabe earth Coaxia anaog output (BNC type) 100 khz - 15 MHz 4 mv / ma TEV sensors Mounting Output Bandwidth Sensitivity Magneticay over metacad Coaxia anaog output (BNC type) 1 MHz - 50 MHz 100 mv / V Noise sensor Gating antenna MHz PD anaysis system (instaed in Laptop) Memory Data storage Cock Software fitering Reporting graphs 8 GB 50GB SSD Core i5, 2.9 GHz Waveet, Low Pass, High Pass, Band Pass, Band Reject 3D pots for Magnitude-Frequency-Phase PRPD 3D pot for comparing PD signas of 3 sensors simutaneousy PD map pot for faut ocation Individua puse pot for acquired signas Mechanica Dimensions Weight 508 mm x 355 mm x 254 mm [20 x 14 x 10 ] 10 kg [22 bs] (without aptop)

8 QCM-C-PD-Survey Service - Partia discharge monitoring for underground power cabes Onine PD measurement at power cabes without disrupting pants / faciities - offine factory testing Exceent interference immunity for PD measurement under difficut conditions Highest eve of reiabiity of PD inspection Highy accurate faut ocation and PD severity anaysis Power cabes are not exposed to higher votage stresses PD measurement and anaysis by highy experienced engineers Unbiased diagnosis and assessment of critica power cabes Expert consuting services during acceptance testing and maintenance panning Service contracts - Long term PD survey and measurements Overa insuation heath assessment and extension of ife time of power cabe About QUALITROL Estabished in 1945, with continua improvement at the core of our business, QUALITROL provides smart utiity asset condition monitoring across the gobe. We are the argest and most trusted goba eader for partia discharge monitoring, asset protection equipment and information products across generation, transmission and distribution. At QUALITROL we are redefining condition monitoring technoogy for Eectric utiities assets QUALITROL Company LLC, an ISO 9001 system certified company. QUALITROL is a registered trademark and OTIWTI is a trademark of QUALITROL Company LLC. A trademarks are properties of their respective companies, as noted herein. A rights reserved. Information subject to change without notice. PD-D27-11L-01E. Emai: info@ quaitrocorp.com