串变调压电炉变压器差动保护研究
针对电炉变压器频繁调压且调压范围宽的特点,提出根据当前电炉变压器有载调压档位实时计算差动保护的平衡系数方法。该方法首先将3个单相电炉变压器档位信息经有载调压档位控制器转换为BCD码信息;然后差动保护装置通过开关量方式接入转换后的BCD码信息,并解码还原为当前实际档位;最后根据变压器调压总档位、各相变压器当前档位、低压侧标称最高电压及最低电压,计算各相变压器低压侧当前工作电压,再结合变压器额定容量、高压侧额定电压,按相实时计算差动保护平衡系数。这种方法解决了电炉变压器差动保护的差动电流计算不正确的难题,工程实践表明该方法明显增加差动电流计算正确性提高差动保护灵敏度。...
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| Published in | 电力系统保护与控制 Vol. 42; no. 16; pp. 118 - 121 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
国网宁夏电力科学研究院,宁夏 银川,750001%哈尔滨工业大学电气工程及自动化学院,黑龙江 哈尔滨,150001%许继电气股份有限公司,河南 许昌,461000
2014
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-3415 |
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| Summary: | 针对电炉变压器频繁调压且调压范围宽的特点,提出根据当前电炉变压器有载调压档位实时计算差动保护的平衡系数方法。该方法首先将3个单相电炉变压器档位信息经有载调压档位控制器转换为BCD码信息;然后差动保护装置通过开关量方式接入转换后的BCD码信息,并解码还原为当前实际档位;最后根据变压器调压总档位、各相变压器当前档位、低压侧标称最高电压及最低电压,计算各相变压器低压侧当前工作电压,再结合变压器额定容量、高压侧额定电压,按相实时计算差动保护平衡系数。这种方法解决了电炉变压器差动保护的差动电流计算不正确的难题,工程实践表明该方法明显增加差动电流计算正确性提高差动保护灵敏度。 |
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| Bibliography: | furnance transformer; differential protection of furnance transformer; balance coefficient; load voltage regulation The three single-phase on load transformer tap changing furnace transformer has the advantages of wide voltage controlled range and frequent voltage control. This paper presents the differential protection device of the fumance transformer should calculate the balance coefficient of the differential protection in real time. First, the gear information of 3 single-phase electric furnace transformer is converted to BCD code information through the OLTC gear controller; then the differential protection device accesses the converted BCD code through switch signal and decodes the information; finally, according to the transformer voltage total gears, each phase current transformer tap, low voltage side of the highest and lowest voltage nominal voltage, each phase current working voltage of low voltage side is calculated, combined with the transformer rated capacity, rated voltage of the high voltage s |
| ISSN: | 1674-3415 |