SU65636A1 - Method for determining insulation resistance of three-phase AC mains with insulated neutral - Google Patents
Method for determining insulation resistance of three-phase AC mains with insulated neutralInfo
- Publication number
- SU65636A1 SU65636A1 SU222A SU331820A SU65636A1 SU 65636 A1 SU65636 A1 SU 65636A1 SU 222 A SU222 A SU 222A SU 331820 A SU331820 A SU 331820A SU 65636 A1 SU65636 A1 SU 65636A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- phase
- mains
- insulation resistance
- insulated neutral
- determining insulation
- Prior art date
Links
Landscapes
- Locating Faults (AREA)
Description
Предметом данного изобретени вл етс способ определени полного сопротивлени изол ции кабельных и других сетей трехфазного тока с изолированной нейтралью без перерыва работы сети, например ,, при периодическом контроле састо ни изол ции цепи. Предла1аемый способ основан на определении сопротивлени искусственного замыкани , обусловливающего максимальную мощность тока замыкани на землю, и осуществл етс путем использовани измерительного прибора по типу ваттметра ,, снабженного двум обмотками- тока и напр жени . Сущность изобретени заключаетс в том, что обе ,)бмотки включают параллельно друг другу между одной из фаз и землей, причем обмотку напр жени -непосредственно , а токовую - последовательно с регулируемым активным сопротивлением, после чего измен ют величину последнего до достижени наибольшего отклонени указател ваттметра, с целью определени величины полного сопротивлени сети относительно земли по величине введённого дополнительного сопротивлени , соответствующего наибольшему отклонению прибора.The subject of the present invention is a method for determining the insulation impedance of cable and other three-phase current networks with insulated neutral without interrupting the operation of the network, for example, while periodically monitoring circuit insulation. The proposed method is based on determining the resistance of the artificial circuit, which determines the maximum power of the earth fault current, and is carried out by using a meter based on a wattmeter equipped with two windings and current. The essence of the invention is that the two windings are connected parallel to each other between one of the phases and the ground, the voltage winding being directly and the current winding sequentially with adjustable resistance, after which the value of the latter is changed to achieve the greatest deviation of the power meter , in order to determine the magnitude of the network impedance relative to the earth by the value of the introduced additional resistance corresponding to the largest deviation of the device.
Изложенное по сн етс чертежом , на котором изображена принципиальна схема включени ваттметра при измерени х по предлагаемому способу.The foregoing is explained in the drawing, which shows a schematic diagram of the inclusion of a wattmeter when measuring according to the proposed method.
Схелта собираетс из ваттметра / 11 регулируемого активного сопротивлени 2, включаемого в цепь токовой катушки ваттметра, и присоедин етс между любой из фаз и землей.The schelta is assembled from a wattmeter / 11 of adjustable resistance 2 connected to the wattmeter current coil circuit and connected between any of the phases and the ground.
Измерение заключаетс в нахождении положени движка регулируемого сопротивлени , соответствующего наибольшему отклонению стрелки ваттметра.The measurement consists in finding the position of the slider of the adjustable resistance corresponding to the greatest deviation of the arrow of the meter.
Сопротивление,реостата, отвечающее указанному положению движка , равно полному сопротивлению изол ции сети.The resistance of the rheostat corresponding to the indicated position of the engine is equal to the total resistance of the insulation of the network.
Этот способ пригоден только при общем исправном состо нии изол ции . Дл защиты прибора в случа х наличи поврежденной изол ции кабел в цепь включаетс плавкий предохранитель 5.This method is only suitable if the overall condition of the insulation is good. In order to protect the device in the event of damaged cable insulation, a fuse 5 is connected to the circuit.
способаof the way
ОбоснованиеJustification
Как известно, потенциал фазы по отношению к земле выражаетс формулойAs is known, the potential of a phase with respect to earth is expressed by the formula
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU222A SU65636A1 (en) | 1944-02-21 | 1944-02-21 | Method for determining insulation resistance of three-phase AC mains with insulated neutral |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU222A SU65636A1 (en) | 1944-02-21 | 1944-02-21 | Method for determining insulation resistance of three-phase AC mains with insulated neutral |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU65636A1 true SU65636A1 (en) | 1945-11-30 |
Family
ID=51301388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU222A SU65636A1 (en) | 1944-02-21 | 1944-02-21 | Method for determining insulation resistance of three-phase AC mains with insulated neutral |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU65636A1 (en) |
-
1944
- 1944-02-21 SU SU222A patent/SU65636A1/en active
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