Testing of Underground Power Cables

Advances in Computer and Electrical Engineering - Environmental Impacts on Underground Power Distribution ◽

10.4018/978-1-4666-6509-5.ch012 ◽

2016 ◽

pp. 288-317

Keyword(s):

Power Systems ◽

Electrical Power ◽

Current Source ◽

Electrical Equipment ◽

Alternating Current ◽

Power Cables ◽

Test Procedures ◽

Electrical Power Systems ◽

Insulation Systems ◽

Underground 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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High-voltage electrical equipment in electrical power systems: diagnostics, defects, damage, monitoring

10.12737/textbook_5d0c6b71495137.62422666 ◽

2019 ◽

Author(s):

Александр Хренников ◽

Alexander Khrennikov

Keyword(s):

Power Systems ◽

Short Circuit ◽

Electrical Power ◽

Electrical Equipment ◽

Diagnostic Methods ◽

Power Transformers ◽

Electrical Power Systems ◽

The Impact ◽

Short Circuit Currents ◽

Detection Of Defects

The analysis of the main methods of diagnostics of electrical equipment for detection of defects and damages in the course of operation is presented. Analysis of the effectiveness of the main diagnostic methods is accompanied by examples of detection of defects and damage to specific equipment: power transformers, reactors, current and voltage transformers, disconnectors, turbogenerators, OPN, etc. Examples of damage and investigation of technological violations of oil-filled transformer-reactor equipment during operation, associated with the loss of electrodynamic resistance of the windings during the flow of through short-circuit currents (short-circuit). The analysis of efficiency of application of methods of diagnostics at detection of defects and damages of power transformers because of the impact of fault current. The questions of electrodynamic tests of power transformers (reactors) for resistance to short-circuit currents, which serve as a tool to improve the reliability of their design, are considered.

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