Part II - IPA SA

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38 REVISTA ROMÂN DE AUTOMATIC dedicated systems developed by acknowledged companies for the special monitoring domains such as vibrations and partial discharges. Consequently to this concept, the resulted system configuration, presented below, contains three PC based diagnosis stations, one for each diagnose domain: • DS1 for vibrations; • DS2 for partial discharges; • DS3 for other data. DS1 DS2 DS3 U1 RS-485 / USB U2 RS-485 / RS-232 RS-485 RS-485 RS-485 Ethernet TCP/IP RS-485 ABB Firewall Plant Server GROUP 1 & 2 GROUP 3 & 4 ZOOM ZOOM GROUP 3 GROUP 4 HydroTrac HydroTrac Sensors Sensors Capacitive couplers Capacitive couplers POWER PLANT CONTROL ROOM VIBRATIONS MONITORING All the components used for the vibrations monitoring as well as the components for the air gap monitoring was procured from VibroSyst M, a Canadian company. VibroSyst M Inc. [1] has, since its founding in 1986, become a leading manufacturer of monitoring and diagnostics systems that support condition-based maintenance of hydro generating units. The VibroSyst M diagnose software system, named “ZOOM” (Zero Outage On-line Monitoring) was adopted for monitoring and diagnostics acquisition of hydro generating units. The ZOOM System is easy to use, simplifies measurement procedures, facilitates behavior analysis and warns the user of alarm conditions. The ZOOM System database assures improved operations and maintenance of hydro generators, increasing its service availability and producing significant savings. The system represents an powerful analytical and diagnostic tool which: - Detect and diagnose anomalies to prevent forced outages; - Synchronized measurements for result correlation; - Simplified analysis process and improved diagnostic accuracy; - Stores all alarm for later event analysis and diagnosis. The VibroSist M system contains a lot of proximity probes mounted on the machines. These probes are connected, with special extension cables, to the programmable and monitoring units logged by IPA in two cabinets near the hydro generator units: one cabinet for group 1 and group 2 and another cabinet for group 3 and group 4. These two cabinets are connected via RS-485 network to the DS1 diagnosis station which is loaded with the ZOOM software. The monitoring refers to the shaft relative vibration, the bearing absolute vibration and the generator air gap correlated with a synchro probe.
REVISTA ROMÂN DE AUTOMATIC 39 PARTIAL DISCHARGE MONITORING All the components used for the Partial Discharge (PD) monitoring, including capacitive couplers, HydroTrac units and special software, was procured from IRIS Power, a Canadian company. The Partial Discharge system was used for two of the four hydro generators, the generators with a voltage of 10,5 kV. In 1994, IRIS [2] installed the world’s first commercial continuous on-line partial discharge measuring system for large generators. The IRIS HydroTrac system was released in 2000. The Partial Discharge testing has become the most pervasive tool for assessing the condition of the stator winding insulation during normal operation of a hydro generator. Typical winding aging condition, which can be detected by partial discharge testing, include: - loose wedges; - insulation delaminating; - separation of copper-insulation bond; - deterioration of semi-conducting coating; - damaged semi-conducting/grading coating overlap area; - cracks on winding insulation; - problems related to thermal, mechanical, and/or electrical aging of the insulation. The results of PD testing are generally summarized by two key indicators or summary numbers: NQN and Qm. These two factors are derived from the standard pulse height analysis plots obtained from a PD test. - NQN is the area under the pulse height analysis curve, and represent the total PD activity and indicate the increasing insulation aging. - Qm is the magnitude, in mV, of the largest PD pulses detected and is indicative of the worst deterioration within the machine. For each of the two 10,5kV hydro generator was allocated a HydroTrac unit. The two units were connected, via an RS-485 network, to the central DS2 diagnosis station. OTHER DATA MONITORING The other data, which were necessary to be monitored, are obtained from the SCADA system, elaborated by ABB Germany, via an OPC server – OPC client connection in which ABB is the server and IPA is the client. As OPC client, IPA has used the RSView32 base software from the Rockwell Automation Company. The process parameters, which are taken over in this way, for analysis, are the following: • Hydro generator stator winding, iron core and bearing temperature; • Cooling water, cooling air and oil temperature; • Guide vane opening; • Grate clogging level; • Water upstream and downstream level; • Circuit breakers and protections state; • Voltage and current in the 0,4 kV circuits; • Oil and cooling water pumps running hours. These information are used to give, for example, a statistical image about the frequency of circuit breakers disconnecting or about how many times a winding temperature has exceed a certain value and at what time. All these data are archived, to be used for a long time diagnosis trend display, or to be edited in a printed report. REFERENCES [1] VibroSyst M “On line monitoring of hydro generating units for optimized operations and maintenance”. [2] B.A. Lloyd and G.C. Stone – Iris Power Engineering – “Experience with continuous on-line stator winding partial discharge monitoring of hydro generators”. AR934-8.doc
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