Ground Distance Algorithm for Single-Phase Grounding Fault of Four-Parallel Transmission Lines Based on Twelve-Sequence Component

2014 ◽  
Vol 945-949 ◽  
pp. 2873-2879
Author(s):  
Zhong An Yu ◽  
Ming Zhao Cheng ◽  
Pei Yu Guo ◽  
Neng Ling Tai
Keyword(s):  
Transmission Lines ◽  
Mutual Coupling ◽  
Single Phase ◽  
High Sensitivity ◽  
Parallel Transmission ◽  
Measured Impedance ◽  
Ground Distance ◽  
Impedance Calculation ◽  
Relationship Of ◽  
The Relationship

The application of traditional distance relay for four-parallel transmission lines is adversely affected by the mutual coupling between the lines. The result will lead to not achieved measured impedance calculation. And it has an effect on the operation of ground protection. In this paper, A new ground distance algorithm is proposed for single-phase grounding fault of four-parallel transmission lines. Based on the case of single-phase grounding fault, The first the relationship between fault point voltage and the voltage at protection installed location is presented by twelve-sequence component method. In the basis, According to the relationship of phase corner between the fault voltage and the fault current to eliminate the effect of fault voltage. The simulation results show that the new scheme has high sensitivity and reliability under different single-phase grounding fault of four-parallel transmission lines.

Study on a New Earth-Fault Distance Protection for Four-Circuit Transmission Lines on the same Tower

2013 ◽  
Vol 706-708 ◽  
pp. 1574-1579
Author(s):  
Pei Yu Guo ◽  
Zhon Gan Yu ◽  
Neng Ling Tai ◽  
Chun Ju Fan
Keyword(s):  
Transmission Lines ◽  
High Sensitivity ◽  
Distance Protection ◽  
Parallel Transmission ◽  
Earth Fault ◽  
Sequence Components ◽  
Components Method ◽  
The Relationship ◽  
Complex Transmission ◽  
High Voltage System

Since the transmission corridors are becoming more and more valuable and the demand for transmission capacity is continually increasing, the four-circuit transmission lines on the same tower have been used more and more in the high-voltage system. For this complex transmission system, there is an unpredictable mutual inductance error when measures the impedance, which will potentially cause the mal-operation of relay. Therefore, it is not feasible to use the traditional earth-fault distance protection in case of the single phase to earth fault. In this paper, twelve-sequence components method is introduced to decouple mutual electromagnetic effect between four-parallel transmission lines. Based on the analysis of the features of each component, the relationship between fault voltage and the current is presented. Furthermore, a new protection criterion for earth-fault distance protection is proposed. The new method has high sensitivity and reliability under different scenarios.

The relationship of plasma creatinine (as eGFR) and high-sensitivity cardiac troponin and NT-proBNP concentrations in a hospital and community outpatient population

2017 ◽  
Vol 50 (15) ◽  
pp. 813-815 ◽  
Author(s):  
Julia M. Potter ◽  
Aaron J. Simpson ◽  
Jennifer Kerrigan ◽  
Emma Southcott ◽  
Marie M. Salib ◽  
...  
Keyword(s):  
Cardiac Troponin ◽  
High Sensitivity ◽  
Plasma Creatinine ◽  
Relationship Of ◽  
The Relationship

Signal Integrity Analysis of High-Speed Signal Connector USB3.0

2013 ◽  
Vol 760-762 ◽  
pp. 320-324
Author(s):  
Shi Lei Zhou ◽  
Ya Lin Guan ◽  
Xin Kun Tang
Keyword(s):  
Transmission Lines ◽  
High Speed ◽  
Signal Integrity ◽  
Signal Transmission ◽  
Simulation Software ◽  
Key Factor ◽  
Transmission Quality ◽  
Integrity Analysis ◽  
Relationship Of ◽  
The Relationship

High-speed signal connector has become a key factor of the signal transmission quality in telecommunications and data communications system. Signal integrity of connector is an inevitable problem. This paper based on the theory of differential transmission lines and Multimode S-Parameters, analyzed the USB3.0 connector signal integrity. And use 3D simulation software CST to build model and analyze the relationship of signal integrity and connectors geometry.

Difference between aftershocks and foreshocks in the relationship of magnitude to frequency of occurrence for the great Chilean earthquake of 1960

1966 ◽  
Vol 56 (1) ◽  
pp. 185-200
Author(s):  
Shigeji Suyehiro
Keyword(s):  
Main Shock ◽  
High Sensitivity ◽  
Frequency Equation ◽  
Frequency Of Occurrence ◽  
South Pole ◽  
Central Japan ◽  
Similar Investigation ◽  
Relationship Of ◽  
The Relationship ◽  
Chilean Earthquake

abstract When a relatively small perceptible earthquake occurred near a tripartite net of high sensitivity in central Japan, a substantial difference was found between its 25 foreshocks and 173 aftershocks in the relation of frequency of occurrence and magnitude. For that study the coefficient “b” in the magnitude versus frequency equation is 0.35 for the former and 0.76 for the latter. A similar investigation has been carried out on the great Chilean earthquake of 1960, also accompanied by many foreshocks and aftershocks. Using four sensitive and suitably located U.S.C.G.S. stations, Eureka, Tucson, South Pole, and Byrd, foreshocks and aftershocks were located in addition to those reported by U.S.C.G.S. or B.C.I.S. Forty-five foreshocks and 250 aftershocks were found in a period of 33 hours before and 33 hours after the main shock. The same characteristic found for the Japanese earthquake was also found for the Chilean earthquake; i.e. the foreshocks showed a different picture from the aftershocks for the frequency of occurrence, and an appreciably smaller value seems to be valid for “b” of the foreshocks.

Abstract 16921: Relationship Between Biomarkers and Different Types of Myocardial Fibrosis in Severe Aortic Valvular Heart Disease

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Lucas J Pires ◽  
Vitor E Rosa ◽  
THAMARA C MORAIS ◽  
Antonio S de Santis ◽  
Joao Ricardo C Fernandes ◽  
...  
Keyword(s):  
Heart Disease ◽  
Myocardial Fibrosis ◽  
Valvular Heart Disease ◽  
Extracellular Volume ◽  
High Sensitivity ◽  
Conventional Tests ◽  
Different Types ◽  
Study Population ◽  
Relationship Of ◽  
The Relationship

Introduction: Aortic stenosis (AS) and aortic regurgitation (AR) patients develop both myocardial hypertrophia and fibrosis. B-type natriuretic peptide (BNP) and troponin are biomarkers whose value in aortic valvular heart disease (VHD) remains controversial. Cardiac magnetic resonance (CMR) imaging can detect replacement myocardial fibrosis (MF) by using late gadolinium enhancement (LGE), and diffuse MF by using extracellular volume (ECV) based measures (relative - ECV fraction - and absolute - indexed ECV) calculated from T1 mapping. Data evaluating the relationship of these biomarkers with both types of MF are scarce in AS, and are missing in AR patients. Hypothesis: There is an association between preoperative BNP and troponin and preoperative MF measures in severe aortic VHD patients. Methods: Patients with isolated severe AS or AR were prospectively recruited to be submitted to CMR before surgery, including LGE and ECV measures quantifications. They also collected blood samples for quantification of BNP and high sensitivity T troponin. The relationship between biomarkers and MF parameters was evaluated using linear regression and nonparametric conventional tests. Results: The study population included 99 patients, 67 with AS and 32 with AR. BNP median was 63 (39-103) pg/mL and troponin median was 17 (5-34) ng/L, no difference between AS and AR (p=0.31 and p=0.88, respectively). BNP and troponin were associated with presence of LGE. BNP median was 47 (32-87) pg/mL without LGE vs. 87 (47-190) pg/mL with LGE (p=0.002). Troponin median was 13 (5-25) ng/L without LGE vs. 30 (10-71) ng/L with LGE (p=0.001). Regarding ECV measures, patients with ECV fraction higher than 28.25% had higher BNP levels (p<0.001) and patients with indexed ECV higher than 24.21mL/m 2 had higher troponin levels (p=0.015) (Figure 1). Conclusions: BNP and troponin are associated with quantity of MF in patients with severe aortic VHD with indication of intervention.

Research about a High-Sensitivity Automatic Liquid Manometer

2012 ◽  
Vol 241-244 ◽  
pp. 186-189
Author(s):  
Xiang Jun Li ◽  
Wei Wang ◽  
Zhan Jun Ma
Keyword(s):  
Glass Tube ◽  
High Sensitivity ◽  
External Pressure ◽  
Original Position ◽  
Sensitive Detector ◽  
Control Rules ◽  
Position Sensitive ◽  
Relationship Of ◽  
The Relationship ◽  
Liquid Manometer

An automatic liquid manometer which operates on the basis of a position-detecting system is described. A slanting laser beam is directed to the meniscus of liquid in a glass tube manometer without a float and is reflected by the meniscus. The reflected spotlight is focused on a position-sensitive detector (PSD) through a lens. The application of external pressure to the manometer causes the position of the meniscus to change, and the pressure can be gotten indirectly by this position. The relationship of the output of PSD to the displacement of meniscus was investigated, and the fuzzy control rules were determined to make the meniscus back to its original position fast and stable. The system has been tested with good results.

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