Enhanced continuous, real-time detection, alarming and analysis of partial discharge events

Transcription

1 DMS PDMG-RH Partia discharge monitor for GIS Enhanced continuous, rea-time detection, aarming and anaysis of partia discharge events Automatic PD faut cassification High resoution Seectabe UHF fiters and gain on a per couper basis Fexibe instaation options Enhanced noise gating features for eimination of interference IEC certified Robust design aows for reiabe operation in amost any environment Product Summary Description Utiizing advanced UHF technoogy, the PDMG-RH system, a member of the highy successfu PDMG-R famiy, is designed for GIS instaations. It coects PD data from UHF sensors (coupers) instaed on the GIS and transmits the information to software for automatic interpretation and anaysis by Expert Software, aowing incipient fauts to be avoided and the condition of the ong term heath of the insuation system to be simpy and effectivey monitored over the ife of the GIS. Appication The PDMG-RH system is used for continuous, onine partia discharge monitoring and anaysis on permanenty instaed appications on a makes of GIS in transmission instaations and on critica systems such as in power pants and arge industria consumers. It provides digita and anaog (SCADA) outputs for remote aarm and warning as we as remote data access to a diagnostic information.

2 DMS PDMG-RH Partia discharge monitor for GIS Enhanced continuous, rea-time detection, aarming and anaysis of partia discharge events Continuous monitoring and detection of partia discharge events enhances system reiabiity and reduces risks The PDMG-RH system enabes the abiity to detect incipient fauts in reatime before faiure, asset damage or oss of power occurs Extends GIS ife and improves the preventative maintenance of the GIS Remote access software aows mutipe users to view partia discharge status in rea-time and acknowedge aarms on a monitored substations Automatic PD faut cassification The expert software automaticay cassifies the PD faut so that a better risk assessment can be made, even by persons who are not PD measurement speciaists A reference ibrary of PD patterns captured on many types of GIS is aso avaiabe to confirm the faut characteristics High resoution Capturing max resoution of 256 sampes of data at 10 bit resoution per cyce up to 220 Hz per channe. With up to 24 channes ive streaming in HV test mode Seectabe UHF fiters and gain on a per couper basis Fiters and gain are seectabe on a per channe basis Robust design aows for reiabe operation in amost any environment The eectronic circuits of the monitoring system are protected against transient over-votages and surges arising from ightning or switching operations Fitering is appied to the sensors signas to reject interference resuting from broadcast signas or discharges in adjacent air-insuated equipment Fexibe instaation options Sensors (coupers) can be retrofitted to existing GIS with externa coupers attached to inspection windows or the exposed edges of insuating spacers The retrofit sensors can be mounted without degassing the chambers and have high sensitivity to UHF signas DMS can custom design a types of UHF coupers for particuar appications and caibrate them to ensure they meet the users specification for sensitivity and bandwidth Enhanced noise gating features for eimination of interference Antenna based noise eimination is integrated into each OCU faciitating the remova of sporadic externa noise signas from the data captured by the coupers IEC certified KEMA Certified IEC interfacing avaiabe, with ogging, reporting (buffered and unbuffered ), aarm acknowedgement, fie services and fu data exposure from the PDM Unrivaed features, enhanced benefits...

3 System components Externa window couper OCU UHF sensor (couper) PD puses induce mutipe broadband resonances in the GIS chamber. These resonant UHF signas are detected by sensitive UHF sensors (coupers) which are instaed on each of the phases. In new GIS the sensors are usuay fitted internay, on the inside of the hatch cover pates (interna coupers). These interna sensors pick up high transient over-votages when disconnect switches or circuit breakers operate. Compete protection for the PDMG-RH systems sensitive eectronics is assured by fitting an externa DMS protector which shunts dangerous votages to earth. Optica Converter Unit (OCU) Each OCU takes the signa from the UHF sensors and appies fitering to reject interference (noise) that can resut from broadcast signas, discharges in nearby air-insuated equipment and other sources. The characteristic of the UHF puse is then sent to the Equipment Cabinet. For retrofitted systems, externa sensors are attached to inspection windows or the exposed edges of insuating spacers. They can be mounted without degassing the chambers and can have sensitivity eves approaching interna sensors. Quaitro DMS can custom-design a types of UHF sensors for particuar appications and caibrate them to ensure they meet the users specification for sensitivity and bandwidth. An additiona channe connected to an externa antenna measures the presence of externa interfering signas and removes the interfering signa from the couper signa by a gating function. Additiona fibres within the cabe are used for OCU contro and to initiate an integrated sef-test procedure that automaticay checks and ogs the condition of each channe. The OCUs are totay protected against high-votage transients and are suitabe for use in harsh environments. Equipment Cabinet The Equipment Cabinet is typicay ocated in the reay or contro room and receives the optica data streams from the OCUs and transmits contro signas back to the OCU (i.e. for the sef test). The data is formatted and stored in a centra server, giving a reatime dispay of the partia discharge activity. The PC interfaces to an IEC network for transfer of aarms, status and data summary, acting as an IED on the network. Equipment Cabinet...from the word eader in PDM

4 DMS PDMG-RH Partia discharge monitor for GIS System software Data handing, dispay and interpretation A singe-cyce event data gathered by the sensors is automaticay cassified by a range of sophisticated anaytica and statistica techniques such as mutipe artificia neura networks, genetic agorithms and fuzzy ogic. A system of redundancy then assesses the anaytica resuts and gives the probabiity that a particuar type of defect is present, i.e. a foating partice, protrusion, insuator void, etc. At the same time, sources of interference such as ights, radar, mobie phones, motors, etc, are identified and rejected. In addition, trend anaysis searches for any reguar changes in the parameter eves defining the PD activity and aerts the operator shoud a defect start showing signs of insuation breakdown. The PDMG-RH system operates simutaneousy in different modes and wi capture isoated PD events even whie dispaying the current on-ine data. The data can be viewed in a number of ways incuding point-on-wave (2D) or in singe-cyce (3D) format to give an instant impression of the PD characteristics. For the remote operation of the system, a PC, modem and LAN interface can be instaed off-site. This enabes the PDMG-RH system to be operated, controed and data received in a simiar way to being present at the substation. In addition, the system can interface to IEC network for aarms, status and data summary transfer. In-service operation 2D, rea time point-on-wave (PRPD) and PRPS data dispay and anaysis 3D, rea time singe-cyce (PRPS) and PRPD dispay and anaysis Time PRPD, STT rea time dispays Periodic storage of point-on-wave dispays for trend anaysis Event Mode captures singe events Data stored on hard disk for up to five years Data ibrary of typica defects Automatic continuous backup of data Automatic sef-check of PDM with fauts ogged and aarmed Automatic synchronization with bus bar votage Transfer of data to remote site by company LAN or modem SMARTPDM - PD signas dispay

5 Interpretation Trend anaysis PD aarms Programmabe aarm criteria Mutipe artificia neura network (ANN) cassification of events Fuzzy ogic Genetic agorithms Warning of PD activity Aarm of high or increased PD activity Automatic communication of warning/aarm condition to headquarters PC Aarm notification using IEC SMARTPDM - PD events dispay Reporting Automatic report generation on daiy, weeky and monthy activity

6 DMS PDMG-RH Partia discharge monitor for GIS Performance / case studies monitored bay-years in-service breakdowns in-service breakdowns prevented Performance statistics Probem detected - void breakdowns prevented per 100 bay-years Probem detected - broken pam joint Probem detected - bushing defects breakdowns prevented per 100 couperyears Performance in the fied The PDMG-R system has proved to be sensitive and reiabe in service. On numerous occasions it has detected potentiay dangerous defects in GIS before faiure coud occur. Quaitro DMS have instaed PDMG-R systems in over 200 GIS, at votages from kv and data is currenty being received from more than 10,000 UHF coupers. During the past 15 years, outages were obtained to remove 84 defects that woud amost certainy have caused compete breakdown had no action been taken. An in-service breakdown in a GIS typicay takes more than a week to repair, and the costs of this, the consequent circuit disruption and oss of suppy in a singe outage usuay far outweigh the initia cost of the PDMG-RH. Discharge in a 230 kv GIS spacer after 5 months of service In a 230 kv GIS, a sudden increase in partia discharge activity was detected by the instaed PDMG-R system approximatey five months after first energization. Prior to this time, the GIS had not shown any PD activity. The partia discharge grew rapidy over a period of ony 24 hours. The operators personne were aerted and responded to the PD event aarm by immediatey isoating the corresponding section of pant. The partia discharge patterns recorded by the PDMG-R system had the characteristics of an insuation defect in one of the spacer insuators. Upon examination by X-ray, the cause of the partia discharge was confirmed to be a 3.2mm void in the epoxy materia. After the spacer was repaced the GIS was retested and went back into service without any detectabe PD. Broken conductor joint detected in a 400kV GIS A 400 kv GIS was retrofitted with a PDMG-R as part of a ifetime extension program. The existing eves of PD were monitored for change. The PDMG-R detected and correcty warned of a deveoping defect. An outage was taken and the GIS was inspected and a broken pam joint in the conductor was found. The use of the PDMG-R System enabed this serious defect to be found and repaired before any serious damage to the GIS occurred. Defects in 400 kv GIS/ transformer interfaces After the commissioning of a 400 kv GIS substation, PD signas were recorded by the PDMG-R cose to the transformer / GIS interfaces on severa circuits. The PD signas started within a few hours and up to severa days after the first energizing. The recorded 100-day-history showed the start point of the discharges and that the magnitude of the PD signas in the first stage were increasing up to a stabe eve. The signas were in the range of up to severa hundred pc. The phase resoved patterns indicated the presence of defects in the insuation of the oi to gas bushings. The bushings were removed and retested in the works where they were found to have a systemic defect that woud have ead to eventua faiure. After repacement of the bushing with new ones, the PD was competey eiminated.

7 TECHNICAL SPECIFICATIONS Equipment Cabinet OCU Interference fitering UHF sensors SMARTPDM and SMARTHQ software Web GIS HV testing Compiance Input Loca MMI interface Additiona MMI interfaces Output Power suppy Suppy current Input UHF bandwidth Gating antenna Dynamic range Ambient operating temperature Humidity Methods Compatibe Operating system Max monitoring ocations System aarms PD warning / aarm Aarm status notification HTML based WEB pages Compatibe EMC compiance 2000 channes max Centra contro computer 19 monitor GPS / backup system Three SCADA/SCS aarm contacts and five auxiiary: - PD warning - PD aarm - System faut Ethernet, IEC or modem communications 8 x LED status indicators Extensive automatic sef test with ogging 110 V 50/60 Hz 200 ma 7 UHF channes (2 x 3 UHF couper inputs + 1 externa antenna) MHz MHz -75 to-30 dbm (ogarithmic) -25 to +55 C (-13 to +131 F) (BS EN , ) 100% condensing Per channe: Software seectabe gating, coincidence, bandpass fitering or software fitering Interna or externa Windows sites System faut Event or PD trend IEC Emai SMS (text message) Aarms System status Data summary Abiity to monitor and record PD during testing Tested to Industria Generic Immunity and Industria Emission standards at enhanced eves

8 DMS PDMG-RH Partia discharge monitor for GIS U n r i v a e d P D M f e a t u r e s e t Enhances system reiabiity and reduces risks Detects fauts in rea-time before faiure, damage or oss of suppy Increases safety for personne Determines condition of GIS insuation Impementation of efficient, condition-based maintenance strategies Extends residua ife of aging pant and defers capita costs Reduces insurance premiums Retrofits to most major GIS systems 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-D27-07A-01E. Emai: info@ quaitrocorp.com