海洋可控源电磁发射系统中的绝缘在线监测技术研究

doi:10.11720/wtyht.2022.1460

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Abstract

The marine controlled source electromagnetic (MCSEM) method is widely used in the exploration of natural gas hydrate, seabed oil and gas resources, and seabed geological structures. In the process of marine operation, the shipborne power supply unit transmits high-voltage and high-power electric power to a marine controlled source electromagnetic transmitter on the seabed through deep towing cables, during which it is necessary to carry out the automatic and real-time measurement and monitoring of the insulation resistance in the high-voltage power supply circuit to ensure the safe transmission of electric energy and timely deal with the abnormal power supply. This study collected the leakage current between the high-pressure end and the ground using high-voltage broadband couplers, insulation detection modules, remote data transmission units, and PC monitoring software. Meanwhile, this study amplified the leakage current using an analog amplifier and then calculated the insulation resistance by measuring voltage, thus achieving the automatic measurement and monitoring of the insulation resistance between the high voltage circuit and the ground. As verified by offshore tests, the automatic online insulation monitoring technology can meet the requirements of the MCSEM system and achieve the ideal online evaluation of the insulation performance of the system, thus providing a useful reference for the research and development of similar functions of marine instruments.

Key words： marine controlled source electromagnetic method transmitter insulation resistance online monitoring technology offshore tests

Received: 20 August 2021 Published: 21 June 2022

ZTFLH:

P631

Corresponding Authors: WANG Meng E-mail: dengming@cugb.edu.cn;wangmeng@cugb.edu.cn

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	Ming DENG
	Meng WANG
	Wen WU
	Xiao-Xi MA
	Xian-Hu LUO

Cite this article:

Ming DENG,Meng WANG,Wen WU, et al. Online insulation monitoring technology for a marine controlled source electromagnetic transmitter system[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 537-543.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1460 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/537

Diagram of insulation resistance and water depth characteristics of the system

General block diagram of the transmitting system

Principle of insulation resistance measurement

Power transmission diagram

Schematic diagram of power failure

Block diagram of insulation on-line monitoring system

Interface of monitoring software of upper computer

Flow chart of monitoring software program of upper computer

Physical picture of deck booster unit

Measured curve of insulation resistance at sea

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