| 引用本文: | 梁志瑞,赵梦雅,牛胜锁,刘海生,梁 爽,郭亚成.配电网电压互感器熔丝熔断防治措施的缺陷及新措施研究[J].电力自动化设备,2016,36(9): |
| LIANG Zhirui,ZHAO Mengya,NIU Shengsuo,LIU Haisheng,LIANG Shuang,GUO Yacheng.Defects of measures against PT fuse melting in distribution network and research of new measure[J].Electric Power Automation Equipment,2016,36(9): |
|
| 摘要: |
| 利用ATP-EMTP建立了10 kV配电系统的数学模型，对铁磁谐振和低频非线性振荡时的电压、电流波形进行了仿真。对现有的电压互感器熔丝熔断防治措施进行了仿真分析并对它们进行综合比较，分析了它们的缺陷。提出一种电压互感器中性点经修正电压互感器并消谐器或线性电阻接地的防治措施，消谐器或线性电阻起到抑制过电流、消耗谐振能量的作用，修正电压互感器起到对电压互感器二次电压测量误差进行修正的作用。高压模拟试验结果验证了所提防治措施有较好的消谐效果。 |
| 关键词: 电磁式电压互感器 熔丝 铁磁谐振 低频非线性振荡 ATP-EMTP 配电网 消谐 |
| DOI： |
| 分类号: |
| 基金项目:专利：中华人民共和国发明专利（201110101084.4） |
|
| Defects of measures against PT fuse melting in distribution network and research of new measure |
|
LIANG Zhirui1, ZHAO Mengya1, NIU Shengsuo1, LIU Haisheng2, LIANG Shuang2, GUO Yacheng2
|
|
1.School of Electrical and Electronic Engineering，North China Electric Power University，Baoding 071003，China;2.State Grid Baoding Electric Power Supply Company，Baoding 071000，China
|
| Abstract: |
| A mathematic model of 10 kV power distribution system is established with ATP-EMTP and the voltage and current waveforms during the ferroresonance or low-frequency nonlinear oscillation are simulated. The existing measures to prevent the PT（Potential Transformer） fuses melting are simulated and compared. Their defects are analyzed and a countermeasure is proposed，which connects the neutral point of PT to ground via，in parallel，a correction PT and a resonance eliminator or linear resistor. The resonance eliminator or linear resistance is used to suppress the over-current and consume the resonance energy，while the correction PT to correct the measuring error of the secondary voltage. The results of high-voltage simulation test verify that the proposed measure has better resonance cancellation effect. |
| Key words: electromagnetic voltage transformer fuse ferroresonance low-frequency nonlinear oscillation ATP-EMTP distribution network resonance cancellation |
