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Automatic Dielectric Loss Tester - Yangzhou Darui

DHX-II HV Phase Detector

Published: 2020-08-18 08:36:55

Views: 2922

Category: Wireless Phase Detector

Product Description










DHX-II HV Phase Detector



Recommended by Darui Electric



Working Principle

图一中,RA=RA′为固定电阻核相棒。固定电阻Ra=Ra′可调电阻r与r′和微安表Ig组装成一只核相表。根据广义交流电桥原理。当UA=UA′时,调节r和r′可使电桥平衡,即Xg=0,此时,被测两端电端电压幅度值和电位相同。如果两端电压电位相同,而幅值不完全相等,调节r和r′仍能使电桥平衡。只有当两端相位不相同时,调节r和r′不能使电桥平衡即Ig=0。此时,被测两端电压不是相同位。



Test Result

1、单根核相棒电阻值和外形测量结果见表1。

Table 1


 










































































    品

Rated Voltage

(kV)



标 称

长 度

(m/m)



实 测

长 度

(m/m)



误差

%



标 称

电阻值

(MΩ)



实 测

电阻值

(MΩ)



误差

%



10



A



900



865



-5



100



100



0



A′



900



865



-3.8



100



100



0



35



A



1100



1080.3



-1.7



357



380



6.4



A′



1100



1080.3



-



 



 



 



10



A



1100



1



 



 



 



12



A′



1100



1150



4.5



660



740



12



2、单根核相棒工频耐压试验结果见表2。

表2































试品额定电压(kV)



试验电压  

(kV)



持续时间  

(分)



结 果



10



50



5



良好



35



105



5



良好



110



300



5



良好





3、单根核相棒、电抗元件发热试验结果见表3。

表3














































    品  

额定电压  

(kV)



   验  

   压  

(kV)



   量  

   流

(uA)



元件

允许电流

(uA)


电流下持续5分钟元件的温升 ℃


10



1.0u线=10



87



674



4.5



2.0u线=20



190



35



1.0u线=35



93



443



5.5



2.0u线=70



184



110



1.0u相=63.5



72



443



5



2.0u相=127



138




测试时环境温度:17.5℃。

Phase Detector整体试验

(1)试验室测试接线见图二。

(2)测试结果见表4。

表4

















































































试品

额定


电压(kV)



两端试验电压(kV)



 A - A′



 A - B′



 A - C′



T1



T2






1 0°



20°



30°






120°+10



120°+20



120°+30






-120°+10



-120°+20



-120°+30



10



10



10



0



10



22



30



46.5



89



89



92



46.5



73



69



62.5



35



35



35



0



12



19



26



40



73



79



80



40



65



60



55



110



50



50



0



6



8



12



37



44



44



44



37



30



35



32




5、现场实测

根据扬州供电局现场实测10kV、35kV和110kV系统的核相结果见表5。

表5


 












































 系统电压

kV)



核 相 表 读 数 (uA)



 A—A′



 A — B′



 A — C′



 B—B′



 B — C′



 B—A′



 C—C′



 C — B′



 C — A′



10



1~2



42~48



42~48



35



1~2



46~48



46~48



110



0~1



53



53





三、结论

1.DHX Phase DetectorThe DHX Phase Detector performs phase verification on HV power lines under operating voltage — a live-line testing tool. The phasing rods in direct contact with high voltage have passed rigorous power-frequency withstand voltage tests, with insulation performance and safety distances fully meeting electrical safety regulations. Additionally, discharge indicator tubes at the rod ends ensure personnel and equipment safety even if the connection between the rod and meter is broken.

2、从模拟两端电压来看相位差30°的同名相电压(如经过长距离输电的线路),虽然调节r和r′电阻不能使电桥完全平衡。但与不同名相的其他两相所测得Ig值相比,它们之间的差值2~3倍,仍能分辨三相的不同相位。

3. After extended field use by power supply bureaus, the instrument is widely regarded as safe, reliable, easy to use, with high phase resolution capability and excellent portability.

4. After appropriate HV calibration, the instrument can also be used for high voltage measurement.



Note: The above information and technical parameters are compiled and published by Yangzhou Darui Electric Co., Ltd.







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Yangzhou Darui Electric Co., Ltd.
Main Products: Dielectric Loss Tester, Transformer Ratio Tester, Loop Resistance Tester, High-Voltage Wireless Phase Detector, Insulation Resistance Tester, Partial Discharge Tester, Cable Fault Tester, DC Resistance Tester, etc.
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