Check pole connector
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The document discusses checking pole connectors in machines containing salient poles to verify tight electric contact. Over time, poor contacts between field windings can develop due to loose bolts, corrosion, or material changes. This causes heating and potential arcing, damaging machine components. To check connectors, an adjustable DC source energizes the series pole windings, and the voltage drop across connectors is measured. High readings or excessive temperature indicate poor connectors. Properly checking requires a DC source and safety precautions during voltage application and cooling.
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DAY 1 (Need/Definition)
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DAY 1 (Need/Definition)
https://youtu.be/BvaykFJ_NoE
DAY 2 (Working principle and Construction)
https://youtu.be/06rgxocihaM
DAY 3 (EMF equation and Turns Ratio)
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The document lists over 100 participants from 23 countries that attended the 2013 Bilderberg Meetings in Hertfordshire, England from June 6-9. It includes prominent figures from politics, business, media, academia and other fields. Henri de Castries chaired the meeting. Notable attendees included Christine Lagarde of the IMF, Mario Monti of Italy, David Cameron of the UK, and various other heads of state, CEOs, academics, and journalists.
Core deffect detector
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The document outlines procedures for conducting a sudden three-phase short-circuit test on synchronous machines. The test is performed to determine machine quantities like reactances and time constants. It involves visual inspections, equipment setup, operating the machine at no-load, applying an excitation voltage, suddenly applying a short-circuit, and recording current and voltage signals. The recorded data is then evaluated mathematically according to standards to determine the machine quantities. Any issues identified during the test require further investigation and reporting.
Loss tangent delta test
The document discusses the loss tangent delta (tan δ) test, which is used to detect deviations in the insulation of rotating machines during their service lifetime. Tan δ is a ratio that measures the loss component versus the capacitive component of current in an insulation. It increases with temperature and applied voltage. Periodic tan δ measurements are recommended to monitor changes from the baseline reading, as increases could indicate deterioration of the insulation system. The test procedure, safety precautions, and interpretation of results are described.
Impedance measurement of field windings
Measuring the impedance of field windings is done to detect turn-to-turn failures. Single turn failures usually do no harm but can cause overheating and further failures. During operation, single failures are hard to detect but can cause unbalanced forces. Techniques to test include measuring voltage drops across each pole or impedance of each pole when energized separately with AC. Special techniques are needed if failures depend on rotor speed. Access to pole connectors or experience is needed for accurate testing.
Measurement of shaft voltage and shaft current on machines with sleeve bearings
This document provides instructions for measuring shaft voltage and shaft current on machines with sleeve bearings. It describes the objectives of verifying proper functioning of bearing insulation and outlines the scope, definitions, measurement procedures, assessment criteria, setting of shaft current protection, and procedures for addressing deviations. Key steps include measuring shaft voltage between the drive end shaft and frame and shaft current by connecting an ammeter in the circuit, as well as verifying effective bearing insulation.
Crack monitor
Crack monitoring uses a brittle conductive lacquer painted over an insulating surface to detect and monitor cracks in machine components. The lacquer cracks along with the material and its cracks can be detected through a monitoring network connected to the lacquer tracks. Laboratory tests showed the system can accurately detect the start of cracks. It has advantages of a thin brittle layer, sensitivity, flexibility in track shapes, and simplicity of application to complex surfaces. Proper cleaning and experience applying the lacquer system are important for effective crack monitoring.
Line to-line sustained short-circuit test
This document provides instructions for performing a line-to-line sustained short-circuit test on synchronous machines to determine the negative sequence reactance (X2) and resistance (R2). The test involves short-circuiting any two line terminals and measuring quantities like short-circuit current, voltage, and active power at various excitation levels up to 0.3 times the rated current. Precautions are outlined to prevent overheating or excessive vibration during the test. Deviations from nominal test values require a nonconformity report. The document is the property of PNG Power and not to be shared with third parties.
Insulation resistance test
The document discusses insulation resistance testing, which measures the insulation resistance of electrical windings to detect moist or polluted insulation. Insulation resistance decreases when the insulation surface becomes wet or dusty. Applying high voltage to wet windings can cause damage. Insulation resistance testing should be done during every service stop and before applying high voltage. The test measures the resistance of the insulation over time, and characteristics like the polarization index and time constant provide information about insulation quality. Proper insulation resistance and time constant values help ensure safe and reliable operation.
Determination of inertia by load rejection
This document provides procedures for determining the moment of inertia, stored energy constant, and acceleration time of a machine set by conducting a load rejection test on site. The test involves operating the generator at 10-20% load, disconnecting it from the network, and recording the change in speed over time. The moment of inertia and other quantities are then calculated using fundamental equations, based on the tangent or differential quotient of the speed-time curve at nominal speed. Any deviations from nominal values require a nonconformity report.
Stator core compr test
This document describes a test to check the mechanical compactness of stator cores in electric machines. The test uses a hydraulically operated device that can partially compress stacks of laminations in the stator core. The compressibility measured at different pressure levels indicates how solidly the laminations are pressed together. Readings that significantly exceed the average may point to issues in the core that require visual inspection with an endoscope. The test is not suitable for cores with glued laminations and requires an experienced technician when operating the equipment near a rotor.
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Sustained three phase short-circuit test and overcurrent test
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PARAMETRIC MODELING OF VOLTAGE DROP IN POWER DISTRIBUTION NETWORKS
PARAMETRIC MODELING OF VOLTAGE DROP IN POWER DISTRIBUTION NETWORKSInternational Journal of Technical Research & Application
- This study presents the evaluation and
parametric modeling of voltage drop in power distribution
networks. The issues of voltage drop in power distribution
networks has become a recurrent decimal in power distribution
sector, which has avert effects on electronics appliances, which
result in incessant fire out in offices and residential buildings.
Benin Electricity Distribution Company (BEDC) injection
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industrial areas with the corresponding time (hour).
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This document provides an overview of basic electronics concepts including:
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1) When telecommunication cables are installed near high-voltage power lines, induction can cause voltage in the cables that threatens worker safety and equipment functionality.
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This test report summarizes insulation testing performed on a stator winding. It includes measurements of tan-delta to evaluate dielectric losses, insulation resistance over time to calculate polarization and time constants, ohmic resistance measurements of each winding phase, and environmental data like temperature and humidity recorded during testing. The report lists key details of the customer, machine, and test results but does not include any overall conclusions about the insulation condition passing or failing acceptance criteria.
Stator core induction test
The document describes a test technique called the core induction test used to detect hot spots in stator cores of rotating machines caused by damage to the laminations. A temporary exciter winding is wound around the stator core being tested and energized to induce a back iron flux similar to normal operating conditions. Hot spots are then detected by feeling the bore surface temperature with a hand or using temperature indicating materials like paraffin. The test helps identify damaged areas in the laminated iron core that could lead to increased heating and failure if left unrepaired.
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This document outlines procedures for conducting an open circuit saturation test on a synchronous generator. The test establishes the relationship between armature winding voltage and excitation current under no load conditions. Key measurements taken include the open circuit saturation characteristic, direct axis synchronous reactance, short circuit ratio, and voltage regulation. The test involves gradually increasing and decreasing the field current while measuring armature voltage and other quantities. Deviations from nominal values are addressed through a nonconformity report.
Noise measurement
This document provides instructions for performing noise measurements on large machines like generators and motors. It outlines the objective to establish a noise statistic for all machines in the division. The scope specifies that the procedure applies to all organizational units, and measurements will be done on each generator during commissioning. Definitions, equipment used, measurement procedures, and sample measurement plans are described in detail. Deviations from the procedure require a nonconformity report. The document is the property of PNG Power and not to be shared externally without permission.
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#Abstract:
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- Gain actionable insights into AWS IAM policies and roles, using hands on approach.
#Prerequisites:
- Basic understanding of AWS services and architecture
- Familiarity with cloud security concepts
- Experience using the AWS Management Console or AWS CLI.
- For hands on lab create account on [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
# Scenario Covered:
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- Exploit misconfiguration for unauthorized access.
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Try at [killercoda.com](https://killercoda.com/cloudsecurity-scenario/)
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原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
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Rainfall intensity duration frequency curve statistical analysis and modeling...
Using data from 41 years in Patna’ India’ the study’s goal is to analyze the trends of how often it rains on a weekly, seasonal, and annual basis (1981−2020). First, utilizing the intensity-duration-frequency (IDF) curve and the relationship by statistically analyzing rainfall’ the historical rainfall data set for Patna’ India’ during a 41 year period (1981−2020), was evaluated for its quality. Changes in the hydrologic cycle as a result of increased greenhouse gas emissions are expected to induce variations in the intensity, length, and frequency of precipitation events. One strategy to lessen vulnerability is to quantify probable changes and adapt to them. Techniques such as log-normal, normal, and Gumbel are used (EV-I). Distributions were created with durations of 1, 2, 3, 6, and 24 h and return times of 2, 5, 10, 25, and 100 years. There were also mathematical correlations discovered between rainfall and recurrence interval.
Findings: Based on findings, the Gumbel approach produced the highest intensity values, whereas the other approaches produced values that were close to each other. The data indicates that 461.9 mm of rain fell during the monsoon season’s 301st week. However, it was found that the 29th week had the greatest average rainfall, 92.6 mm. With 952.6 mm on average, the monsoon season saw the highest rainfall. Calculations revealed that the yearly rainfall averaged 1171.1 mm. Using Weibull’s method, the study was subsequently expanded to examine rainfall distribution at different recurrence intervals of 2, 5, 10, and 25 years. Rainfall and recurrence interval mathematical correlations were also developed. Further regression analysis revealed that short wave irrigation, wind direction, wind speed, pressure, relative humidity, and temperature all had a substantial influence on rainfall.
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Check pole connector
- 1. CHECK OF POLE CONNECTORS General: The check of the pole connectors (i.e. the electric connection from field winding of one pole to the field winding of the next pole) is done in order to verify the tight electric contact of these connectors. Introduction During long-time service of machines containing salient poles, the electric contact between the field windings may become poor. Reasons for this are e.g. loosening of the bolts, corrosion of contact, surfaces, settings in contact materials etc. In consequences, in service such poor contacts are heated up by the field current and – as the worst – arcing is caused, followed by severe destruction of machine components. Checking Technique During the check of pole connectors, the series connection of all pole windings is enegized by an adjustable DC source I~ through the field-windings and thus over the pole connectors. I~ should be chosen in a magnitude near to the nominal exciter current of the magnet wheel. While the magnet wheel is energized, both the voltage drop (mV) at the pole connectors are recorded (Figure 1 and 2). High mV-readings and excessive temperature rises obviosly indicate poor pole connectors. General Requirements For the performance of the check of pole connectors an appropriate DC source is the minimum requirement. During the application of the DC voltage, safety precautions and the cooling conditions have to be observed. © This QM-Instruction is properly of PNG Power and must neither be copied nor used in any other way without the written consent of PNG Power. Neither is it to be handed over nor in other way communicated to a third party. Infringement will lead to prosecution. /mnt/temp/unoconv/20140618060249/checkpoleconnector -140618010248-phpapp01.doc Page 1