ITER极向场变流器温升试验方法

张秀青; 傅鹏; 高格; 宋执权; 汪舒生

doi:10.11884/HPLPB201931.180315

ITER极向场变流器温升试验方法

doi: 10.11884/HPLPB201931.180315

中国科学院等离子体物理研究所，合肥 230031

详细信息

作者简介:
张秀青(1980—)，女，博士，助研，从事大功率变流器系统测试方法研究；xqzhang@ipp.ac.cn

中图分类号: TM564.1
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出版历程
- 收稿日期: 2018-12-05
- 修回日期: 2018-12-20
- 刊出日期: 2019-03-15

Temperature rise test method of ITER poloidal field converter

Institute of Plasma Science, Chinese Academy of Sciences, Hefei 230031, China

摘要

摘要: ITER极向场变流器是一种高功率大电流的六脉波桥变流器，其额定容量41 MV·A、额定电流27.5 kA。为了承载如此大的额定电流，ITER极向场变流器被设计成每个桥臂由12个晶闸管支路并联组成。在温升试验中，晶闸管支路中的晶闸管壳、快熔、软连接以及RC回路电阻等多个关键部位的温度需要检测，如果每个晶闸管支路都布置测温点，则测温点多达几百个，大大增加其温升试验的难度。为简化测温点、便于温升试验，本文采用先均流再温升的试验方法，通过均流试验得出各桥臂均流系数，在均流系数最小的三个桥臂中选出承担最大电流的晶闸管支路，然后在温升试验中只需验证这三个承担最大电流晶闸管支路的温升。由焦耳定律可知，只要承载最大电流的三个晶闸管支路关键位置的温升满足要求，则其他晶闸管支路的温升一定满足要求。该试验方法将测温点由几百个简化成十几个，为测温点的布置以及温度数据的采集带来便利。
- ITER /
- 变流器 /
- 大电流 /
- 温升试验
Abstract: International thermonuclear experimental reactor (ITER) poloidal field (PF) converter is a high-power and heavy-current six-pulse converter bridge with rated capacity of 41 MV·A and rated current of 27.5 kA. For such a large rated current, ITER PF converter is designed to consist of 12 thyristor branches in parallel on each bridge arm. In temperature rise test, the temperature of several key parts such as thyristor case, fast fuse, flexible connection and RC loop resistance in the thyristor branch needs to be detected. If the temperature measurement points are arranged in each thyristor branch, there will be hundreds of temperature measurement points, which greatly increases the difficulty of temperature rise test. In order to decrease the temperature measurement points and facilitate the temperature rise test, the test method that the current balance test is performed first to get three thyristor branches with maximum current sharing and then the temperature rise test is performed at that key parts on these three thyristor branches is proposed in this paper. According to Joule's law, the key parts temperature rise of other thyristor branches must satisfy the requirement as long as the temperature rise of that key parts in these three thyristor branches with maximum current sharing satisfies the requirement. This test method simplifies the temperature measurement points from hundreds to dozens, which facilitates the layout of temperature measurement points and the acquisition of temperature data.
- ITER /
- converter /
- heavy current /
- temperature rise test

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图 1 ITER极向场变流器温升试验的电路拓扑

Figure 1. Topology of temperature rise test of ITER PF converter

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图 2 ITER极向场变流器的结构

Figure 2. Structure of ITER PF converter

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图 3 均流试验的预设电流波形

Figure 3. Preset current waveform of current balance test

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图 4 温升试验的预设电流波形

Figure 4. Preset current waveform of temperature rise test

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图 5 均流试验的输出电流波形

Figure 5. Output current waveform of current balance test

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图 6 桥臂1的各晶闸管支路电流波形

Figure 6. Each thyristor branch current waveforms of arm 1

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图 7 变流器关键位置测温点的布置

Figure 7. Temperature measurement points Layout of the key position on the converter

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图 8 温升试验的电流波形

Figure 8. The current waveform of temperature rise test

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图 9 温度曲线

Figure 9. The curve of temperature

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表 1 均流试验的测量及采集设备列表

Table 1. Instrumentation list of current balance test

name	type	parameter	accuracy rating/%	number
Rogowski coil	831s	0~100 kA	1.00	72
Holzer current sensor	HZFCS-30	-30~30 kA	±0.50	1
data acquisition system	HI-TECHNIQUES	-10~10 V	±0.15	1

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表 2 各晶闸管支路电流

Table 2. The current of each thyristor branch

branch current	average current/A						branch current	average current/A
branch current	arm 1	arm 2	arm 3	arm 4	arm 5	arm 6	branch current	arm 1	arm 2	arm 3	arm 4	arm 5	arm 6
I₁	814.5	837.7	692.7	913.6	857.2	867.1	I₇	829.1	860.7	1036.5	899.9	830.5	773.5
I₂	862.7	857.0	774.6	849.3	831.8	842.5	I₈	781.2	953.5	863.0	944.3	823.5	855.7
I₃	698.1	809.3	687.6	834.3	752.1	730.3	I₉	716.7	732.8	774.4	719.2	714.1	768.7
I₄	724.7	654.4	558.4	742.0	716.5	715.9	I₁₀	690.9	708.9	844.8	719.3	696.0	676.6
I₅	868.5	722.3	688.9	788.2	666.9	738.8	I₁₁	804.3	747.4	834.0	705.9	876.7	870.0
I₆	798.1	632.7	517.2	707.4	658.5	561.5	I₁₂	723.8	741.5	952.7	644.4	772.6	773.6
							sum	9 312.5	9 258.2	9 224.8	9 467.8	9 196.4	9 174.2

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表 3 各桥臂的均流系数

Table 3. The current branch coefficient of each bridge arm

arm number	current balance coefficient	arm number	current balance coefficient	arm number	current balance coefficient
arm 1	0.894	arm 3	0.742	arm 5	0.874
arm 2	0.809	arm 4	0.836	arm 6	0.879

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表 4 温升试验的测量及采集设备列表

Table 4. Instrumentation list of temperature rise test

name	type	parameter	accuracy rating	number
temperature sensor	PT100	-200 ℃~+500 ℃	0.3%	14
temperature recorder	TP1000	Channel: 32	±0.2%FS	1
thermal imager	Fluke Ti10	-20 ℃~+250 ℃	±2 ℃ or 2%	1
Holzer current sensor	HZFCS-30	-30~30 kA	±0.5%	1
data acquisition system	HI-TECHNIQUES	-10~10 V	±0.15%	1

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表 5 稳态温度及温升

Table 5. Steady-state temperature and temperature rise

measurement position	steady-state temperature/℃	temperature rise/℃	measurement position	steady-state temperature/℃	temperature rise/℃
thyristor case of 3-7	48.9	15.6	thyristor case of 4-8	44.7	11.4
RC loop resistance of 3-7	58.0	24.7	RC loop resistance of 4-8	50.4	17.1
fast fuse of 3-7	64.5	31.2	fast fuse of 4-8	53.0	19.7
flexible connection of 3-7	75.1	41.8	flexible connection of 4-8	49.5	16.2
thyristor case of 2-8	44.7	11.4	ambience	33.3	2.9
RC loop resistance of 2-8	50.1	16.8	inlet water	34.5	6.4
fast fuse of 2-8	54.6	21.3	outlet water	43.8	15.7
flexible connection of 2-8	52.8	19.5

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参考文献(10)

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