Reduction of Alternating-Current Losses in (RE)Ba2Cu3Ox Monolayer and Double-Layer Superconducting Power Cables

Probably 80% of all testing performed in electrical power systems is related to the verification of insulation quality. This chapter briefly describes the fundamental concepts of insulation testing including – insulation behavior, types of tests, and some test procedures. Most electrical equipment in utility, industrial, and commercial power systems uses either 50 or 60 Hz alternating current. Because of this, the use of an alternating current source to test insulation would appear to be the logical choice. However, as will be described a little later, insulation systems are extremely capacitive. For this and other reasons, DC has found a large niche in the technology. Before we can really evaluate the value of one system as opposed to the other (e.g. AC vs DC), let us examine how each type of voltage affects insulation. Testing of underground power cables are reported by NS161. (2014). IEC 6038. (1979). IEC Standard 60228. (1979). IEC60229. (2007). IEC60230. (1974). IEC60233. (1981). IEC 60332 (1974). IEC 6071 (2008). IEC 60270. (2000), IEC 60287. (2002).

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Oscillographic polarography with rectangular alternating current. II. Measurement of differential capacity of electrode double-layer

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19654280 ◽

1965 ◽

Vol 30 (12) ◽

pp. 4280-4286 ◽

Cited By ~ 7

Author(s):

R. Kalvoda

Keyword(s):

Double Layer ◽

Alternating Current ◽

Differential Capacity ◽

Oscillographic Polarography

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Studying electric double layer under sorption of gold on activated carbons from thiocarbamide solutions

Proceedings of Irkutsk State Technical University ◽

10.21285/1814-3520-2020-6-1337-1346 ◽

2021 ◽

Vol 24 (6) ◽

pp. 1337-1346

Author(s):

V. V. Elshin ◽

Yu. E. Golodkov

Keyword(s):

Double Layer ◽

Direct Current ◽

Electric Double Layer ◽

Activated Carbons ◽

Alternating Current ◽

Gold Deposition ◽

Polarization Current ◽

Sorbent Surface ◽

Conductometric Method ◽

Thick Part

The purpose of the article is to research the mechanism of gold-thiocarbamide complex sorption by activated carbons by studying the properties of the resulting electric double layer. The study of the electric double layer of coal sorption surface is conducted using a polar conductometric method based on the simultaneous use of polarization dependences on direct current and conductometric measurements on alternating current. It is shown that the sorption of thiocarbamide complexes of gold occurs more intensively at the cathodic values of sorbent potentials. Dependence of the adsorption value on the potential is actually linear in the negative region from 0.05 to 0.2 V. The absolute value of goldthiocarbamide sorption at the negative sorbent potential of 0.2 V coincides with the maximum values of the polarization current for direct current and conductivity for alternating current. The electrochemical reduction reaction of thiocarbamide compounds results in the formation of neutral thiocarbamide molecules, it might be the reason for gold deposition in a metallic form on the surface of the carbon sorbent. Neutralization of active compounds in the electric double layer creates conditions for the activation of positively charged gold ions directing to the negatively charged sorbent surface. The anodic region of sorbent polarization is characterized by the maximum values of gold ion sorption at the positive potential of 0.2 V. In this case the sorbent surface should be recharged, since in the same region of the potential the maximum AC conductivity is observed. Such conditions should lead to the destruction of the thick part of the electric double layer and, consequently, create favorable sorption conditions. The conducted studies allowed to derive a conclusion that the sor ption of gold-thiocarbamide complexes by activated carbons is significantly influenced by the sorbent potential. The use of the polar conductometric method for studying the electric double layer makes it possible to explain the features of given compound sorption on activated carbons.

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