Temperature Rise Test and Comparative Analysis of Saturable Reactors for New Generation of ±800 kV/8 GW UHVDC Converter Valve

doi:10.12204/j.issn.1000-7229.2020.10.010

Abstract

Abstract:

In order to study the temperature rise characteristic of the saturable reactor for UHVDC converter valve and obtain the temperature distribution laws of the cores inside, this paper analyzes the calculation models of saturable reactor loss and core temperature rise on the basis of existing researches. A temperature rise test mothed for saturable reactors is proposed on the basis of embedded optical fibre temperature sensors, by which the temperature of all the cores inside could be measured directly. Two test conditions are designed considering the new generation of ±800 kV/8 GW UHVDC transmission project, including the equivalent core loss loading method by high frequency power source and valve section operating test loading method by synthetic test circuit. The temperature of the key points of four kinds of UHVDC valve reactors are measured and the temperature distribution characteristics of cores inside are analyzed comparatively. The results show that, under two test conditions, the temperature of the cores close to cooling water inlet and outlet are lower than others in one valve saturable reactor, and the temperature rise characteristics of each type of saturable reactor are basically consistent. Under operating condition, the core temperature of each type of valve reactor is lower than 90℃ and the case temperature is lower than 75℃, which can meet the requirements of UHVDC project.

Key words: UHVDC, valve saturable reactor, optical fibre temperature sensor, temperature rise test, core temperature rise, temperature distribution

CLC Number:

TM474

LIU Banghu, WANG Jialong, PAN Lizhe, YANG Yong, SHI Yan, LI Ming. Temperature Rise Test and Comparative Analysis of Saturable Reactors for New Generation of ±800 kV/8 GW UHVDC Converter Valve[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(10): 90-97.

Figures/Tables 12

Fig.1 Structure of valve saturable reactor

Fig.2 Sectional view of saturable reactor core under two design schemes

Fig.3 Thermal resistance model of saturable reactor core

Fig.4 Saturable reactor with embedded optical fibre temperature sensors

Table 1 Design parameters of valve saturable reactor in ±800 kV/8 GW converter

Fig.5 Indication of the core number in saturable reactor

Fig.6 Curve of temperature rising of cores in Reactor A

Table 2 Temperature rise test results of different type of reactor under equivalent core loss loading condition

Fig.7 Temperature distribution curves of cores in different reactors

Fig.8 Voltage curve of Reactor A under valve section operating test condition

Table 3 Temperature rise test results of valve saturable reactor under different test conditions

Fig.9 Temperature distribution curves of cores in Reactor C under two test conditions

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