PDF | Vector network analyzer (VNA) is versatile measuring equipment which is primarily used for two-port device S parameters measurements. This paper... | Find, read and cite ...
PDF | Vector network analyzer (VNA) is versatile measuring equipment which is primarily used for two-port device S parameters measurements. This paper... | Find, read and cite ...
New Energy Sources WhatsAppFor an ADC system to work properly, a S/H circuit is probably used as the first stage. Fig. 1a shows a block diagram of a switched-capacitor S/H circuit including a common mode feedback circuitry. During the sample stage shown in Fig. 1b (ϕ1 high), the capacitor C IN will hold a charge equal to the product of its value and the input voltage …
New Energy Sources WhatsAppWith this method, the measurement error exceeding the limit of capacitor voltage transformer can be detected online without a power outage. The simulations have …
New Energy Sources WhatsAppThis paper analyses the influence of environmental factors on harmonic measurement error of CVT, and proposes a new method for analysing the harmonic …
New Energy Sources WhatsApp1. Introduction Capacitive Voltage Transformer (CVT) is an important measuring equipment for power systems, with good insulation, high cost-effectiveness, and it is widely employed in High-Voltage (HV) and Ultra-High-Voltage (UHV) power systems, accounting for ...
New Energy Sources WhatsAppIntroduction. The capacitor voltage transformer (CVT) has been widely used in high voltage (HV) and ultra-high voltage (UHV) substations to convert the primary voltage into the suitable voltage for measurement devices or relay protection devices.
New Energy Sources WhatsAppWhen the manufacturers produce capacitor voltage transformers (CVT), the function of harmonic measurement is not considered. Therefore, this paper explores methods to solve the problems of ...
New Energy Sources WhatsAppThe experimental results show that the proposed method effectively identifies error fluctuations at 0.02% with a detection accuracy for the CVT amplitude error overshoot …
New Energy Sources WhatsAppA resistor-capacitor, or RC, circuit is an important circuit in electrical engineering; it is used in a variety of applications such as self-oscillating, timing, and filter circuits, these are just to name a few examples this lab, you will investigate how the RC circuit responds when a DC voltage source is applied to it and learn about the charging and discharging properties …
New Energy Sources WhatsAppThe mutation error experiment simulates the ratio error caused by the breakdown of a single capacity unit, while the gradual error experiment simulates the …
New Energy Sources WhatsAppThis paper explores the mechanism for the harmonic voltage measurement error (HVME) of a capacitor voltage transformer (CVT) in a comprehensive way and develops a practical error correction …
New Energy Sources WhatsAppadshelp[at]cfa.harvard The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
New Energy Sources WhatsAppThe experimental results demonstrate that the model with multitask architecture can successfully learn the coupling relationship of three-phase CVT metering …
New Energy Sources WhatsAppAn increase of equivalent capacitance and dielectric loss factor in the low-voltage capacitor will cause a negative real power measurement error. Measurement errors of a capacitive voltage transformer (CVT) are …
New Energy Sources WhatsAppIn this paper, the sensing mechanism of a novel capacitive nanometer sensor based on the time grating approach is investigated. A mathematical model of the sensor is established using electric field coupling theory and the area integral method, which indicates that the measured displacement of the object is proportional to the phase shift …
New Energy Sources WhatsAppThus, this study first analyzes the basic principle of the CVT measurement error self-detection method based on principal component analysis under the constraints of three-phase symmetrical operating …
New Energy Sources WhatsAppThis analysis has shown there are a lot of properties to consider when measuring the value of a capacitor. For general bench troubleshooting or for measuring high-quality film capacitors, the simple and inexpensive time-based technique built in to general purpose multi-meters should be more than adequate.
New Energy Sources WhatsAppBased on the obtained results, it can be seen that CVT in more than 90% of its life is in good condition, and with suitable measurement quality. Moreover, the probability of CVT failure has been obtained 0.00046703, which is approximately equal to the presented ...
New Energy Sources WhatsAppThe basic structure of CVTs is shown in Fig. 1, it mainly consists of a capacitive voltage divider, a compensating reactor, an intermediate transformer and a damper IEC [3] and He et al. [2].The capacitive voltage divider consists of hundreds of same capacitor elements in series, which can be divided into high-voltage (HV) capacitor C H …
New Energy Sources WhatsAppProcedure for the capacitor impedance measurement using the reflection technique ESL 1 . 2 4 f res C (8) 2 F. Comparison of the measurement results Using the procedures developed capacitors with different 3 A 10 2 B 10 D |Zc|, ohms make full two-port TOSM calibration; connect the type N RF connector with soldered capacitor (Fig.4(a)) to VNA ...
New Energy Sources WhatsAppUnderstanding long-term monitoring steady-state errors of capacitor voltage transformers (CVTs) is critical for acquiring accurate and continuous voltage signals from the power grid. ... Influence of a SVC on AC Arc furnaces harmonics, flicker and unbalance measurement and analysis, in: Melecon 2010 - 2010 15th IEEE …
New Energy Sources WhatsAppIn this paper, an innovative approach is proposed to detect the measurement error drift of CVTs connected to the same phase. Through principal …
New Energy Sources WhatsAppfrequencies of the HECs. The harmonic voltage measurement performances of CVTs with dif-ferent types of dampers are compared in Section 4. Section 5 presents the principle and appli-
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New Energy Sources WhatsAppThe voltage divider is the key piece of equipment in high-voltage direct current (HVDC) transmission systems. It is mainly used for voltage measurement and provides voltage signals to secondary protection and related devices [1,2,3,4,5].There are two representative DC voltage measuring devices, namely, the resistance voltage divider …
New Energy Sources WhatsAppThe capacitive voltage divider consists of hundreds of same capacitor elements in series, which can be divided into high-voltage (HV) capacitor C H and medium-voltage (MV) capacitor C M. The capacitive voltage divider converts the primary voltage into the medium voltage, which is the input voltage of intermediate transformer.
New Energy Sources WhatsApp4 APPENDIX A. MEASUREMENT AND ERROR ANALYSIS as well the units in which the quantity was measured. For example: 1. m= 9.0 kg: WRONG — no uncertainty. 2. m= 9.0 ±0.3: WRONG — no units. 3. m= 9.0 ±0.3 kg: RIGHT. A.2 Precision and Accuracy Precision The uncertainty (or "experimental error") reported above is perhaps more accurately ...
New Energy Sources WhatsApp2.1 Working Principle of CVTThe CVT is composed of a capacitive voltage divider and an electromagnetic unit, which is connected to the electromagnetic unit through a series capacitor voltage division. Its electrical structure is shown in Fig. 1, where C 1 and C 2 are the high-voltage capacitor and the medium-voltage capacitor of the capacitor voltage …
New Energy Sources WhatsAppThe internal insulation condition of capacitor voltage transformers (CVTs) is a key influence factor that affects their measurement performance and safe operation.
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