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This paper reports on the deployment of a continuous online partial discharge (OLPD) system to monitor a gas turbine generator at a combined cycle gas turbine (CCGT) power station. The site consists of two gas turbines rated at 250 MW and one steam turbine rated at 260 MW.
Partial Discharge (PD) monitoring is nowadays a worldwide accepted method for the condition-based assessment of stator insulation. Different solutions for sensors and acquisition techniques have been recommended, applied and lately acknowledged by international technical bodies [1-2]. Therefore, there is a strong need for a versatile PD monitoring system that can be applied to different types of rotating...
Permanent Partial Discharge Monitoring (PDM) systems were installed in several generators in South America from 2009 to 2011. The installation fell within a long term project envisaging the installation of PDM systems in several generators placed in different power plants. All PDM units send automatically data and alarms to a Central Unit (CU) placed in the utility headquarter. Through the use of...
The proper application of motors requires the exchange of design data sheets. The American Petroleum Institute Standard API 541, 4th Edition, is the premier document on how to specify electrical induction motors. This paper will address one application failure in which the user did not apply the motor in accordance with API standards. This paper will review procedures for monitoring temperatures,...
The use of partial discharge (PD) online monitoring as an indicator of hydro-generator stator insulation condition, is well known. In this paper, a set of partial discharge online monitoring system for hydro generator (HPDMS) with the characteristics of high reliability is developed, and the de-noise method of the system is introduced, In succession, the influence of PD sensors installation on hydro-generator's...
Power generator is the most important equipment in power system, and the security and reliability of power system are influenced by its running status. Generators failure or generators break down can cause high financial consequences. For this reason, several concepts for the condition monitoring of generators have been developed. Large volume of available data from monitoring systems can overwhelm...
Condition assessment of electric machinery has always been a challenge. Even with the best of monitoring, inspection and test, major uncertainties remain relative to remaining reliable life of a generator. On-line monitoring is particularly deficient. Other than load conditions of volts, currents, etc., there are few standard monitoring instruments: slot resistance temperature detectors (which give...
This study presented a condition-based maintenance (CBM) method for generator's insulation faults based on radio frequency (RF) monitoring technique and fuzzy inference technique. As an on-line condition monitor and the precondition of CBM, the RF monitor used the high frequency current mutual inductor to detect the partial discharge signal from neutral wire of stator windings. For analyzing condition...
Superconducting Magnetic Energy Storage (SMES) is believed to be a potential solution for power quality improvements. This paper is to propose a power conditioner system for the SMES operation. The SMES is located at the generator bus terminal to suppressing the power oscillation during dynamic period. Through the experiment results given, this paper developed a detailed model of the fabricated SMES...
On-line partial discharge (PD) monitoring has become the most widely applied method to determine the condition of the electrical insulation in stator windings. Presently over 12,000 large motors and generators around the world are equipped with the required sensors.
On-line PD monitoring system with higher sensitivity and low noise features was developed for rotating machines such as turbine generator and high voltage motor. By using narrow band detection in GHz region, the features were achieved. The system is composed of an antenna, a specifically designed signal processing circuit and data acquisition equipment. The antenna is so-called patch antenna and its...
In today's energy market, operators want to minimize the costs for maintenance and outages. Condition-based maintenance techniques using diagnostics and or monitoring systems are a prequisit in power grids nowadays. At times where the need for such systems is increasing, the time and knowledge available for analysis and interpretation is decreasing. Therefore, STRI, LDIC, VB Kraft and VB Elnat have...
Partial discharge (PD) testing has been used for over 50 years to detect insulation problems in motor and generator stator windings. By periodically measuring the on-line PD activity, usually at least two years warning is given before the risk of stator winding failure is high - which is sufficient time to plan corrective maintenance or a rewind. Such testing is now routinely applied to more than...
Reducing maintenance cost is very important for electric power utilities in order to have the advantage in competitive power market. Besides the reliability of facilities is required to be kept in certain level. In such situation, it is necessary to know the machine condition surely in order to conduct condition based maintenance (CBM).
The Oil/Gas industry is facing two major problems with its aging electric power generators. First, the Oil/Gas industry experience long outages of these power generation units for re-winding, during a time when power is extremely needed. Second, these fixed-interval scheduled maintenance practices are very costly as on average they cost around US$1 million per machine. To address these problems, we...
As mechanical vibration usually exists in HV motors and generators, its influence on the partial discharge (PD) needs to be studied so as to improve the reliability of on-line PD monitoring method. In this report, the mechanical vibration frequency was synchronized to the power frequency and the effects of vibration phase were investigated. Because the length of the discharge gap changed with the...
Failure of the insulation in distribution-class metalclad switchgear may release large amounts of energy resulting in an explosive hazard to adjacent equipment and personnel. Many such failures have occurred in older outdoor and generating station switchgear within Ontario Hydro. The failures have often been caused by partial discharge (PD) activity and surface tracking which destroy organic bus support...
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