SU67079A1 - Method for determining insulation impedance relative to earth of three-phase cable networks with insulated neutral - Google Patents
Method for determining insulation impedance relative to earth of three-phase cable networks with insulated neutralInfo
- Publication number
- SU67079A1 SU67079A1 SU223A SU331821A SU67079A1 SU 67079 A1 SU67079 A1 SU 67079A1 SU 223 A SU223 A SU 223A SU 331821 A SU331821 A SU 331821A SU 67079 A1 SU67079 A1 SU 67079A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- earth
- cable networks
- phase cable
- insulation impedance
- impedance relative
- Prior art date
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
СПОСОБ ОПРЕДЕЛЕНИЯ ПОЛНОГО СОПРОТИВЛЕНИЯMETHOD FOR DETERMINING FULL RESISTANCE
ИЗОЛЯЦИИ ОТНОСИТЕЛЬНО ЗЕМЛИ ТРЕХФАЗНЫХ КАБЕЛЬНЫХ СЕТЕЙ С ИЗОЛИРОВАННОЙ НЕЙТРАЛЬЮINSULATION WITH RESPECT TO THE EARTH OF THREE-PHASE CABLE NETWORKS WITH ISOLATED NEUTRAL
За влено 21 феврал 1944 года в Наркомат Электростанций за № 223 (331821) Опубликовано 30 сент бр 1946 годаFebruary 21, 1944 was submitted to the People's Commissariat of Power Plants No. 223 (331821). Published September 30, 1946.
Предметом изобретени вл етс способ определени полного сопротивлени изол ции (по отношению к земле) трехфазных кабельных сетей низкого напр жени с изолированной нейтралью без перерыва работы сети. Дл осуществлени предлагаемого способа пользуютс только двум измерительными приборами - вольтметром и амперметром и производ т только два измерени : измер ют потенциал фазы относительно земли при помощи вольтметра, не имеющего собственного потреблени (например , электростатического типа) и ток утечки при коротком замыкании той же фазы на землю, после чего величину полного сопротивлени определ ют путем делени показани вольтметра на показание амперметра.The subject of the invention is a method for determining the insulation impedance (with respect to earth) of three-phase low voltage cable networks with insulated neutral without interrupting network operation. To implement the proposed method, only two measuring instruments are used — a voltmeter and an ammeter — and only two measurements are taken: the potential of the phase relative to the earth is measured using a voltmeter that does not have its own consumption (for example, electrostatic type) and the leakage current during a short circuit of the same phase ground, after which the impedance value is determined by dividing the reading of the voltmeter by the reading of the ammeter.
Изложенное по сн етс чертежом , на котором изображена электрическа схема включени измерительных приборов при осуществлении предлагаемого способа.The foregoing is explained in the drawing, which shows an electrical circuit for switching on measuring instruments when carrying out the proposed method.
Схема собираетс из вольтметра V с большим сопротивлением (электростатического или электронного) и амперметра А и присоедин етс между любой из фаз и землей.The circuit is assembled from a high resistance voltmeter V (electrostatic or electronic) and ammeter A and is connected between any of the phases and the earth.
Определение сопротивлени производитс следующим образом:Resistance is determined as follows:
а)при разомкнутом рубильнике в цепи амперметра измер етс потенциал фазы;a) with open switch in the ammeter circuit, the potential of the phase is measured;
б)замыканием рубильника фаза заземл етс наглухо через амперметр « измер етс ток утечки;b) by closing the switch, the phase is grounded tightly through an ammeter; the leakage current is measured;
в} в результате делени показаний вольтметра (первое измерение) на показание амперметра (второе измерение) получаетс искомое полное сопротивление.c) by dividing the voltmeter (first measurement) by the ammeter (second measurement), the desired impedance is obtained.
Предлагаемый способ пригоден только при исправном состо нии изол ции. Дл защиты амперметра в случа х наличи повреждени изол ции кабел в цепь включаетс плавкий предохранитель.The proposed method is suitable only in good insulation condition. In order to protect the ammeter in the event of damage to the cable insulation, a fuse is included in the circuit.
Предмет изобретени Subject invention
Способ определени полного сопротивлени изол ции относительно земли трехфазных кабельных сетей с изолированной нейтралью без отключени сети от станции, отличающийс тем, что измер ют потенциал фазы относительно земли при помощи вольтметра, не имеющего собственного потреблени (например, электростатическогоThe method of determining the insulation impedance relative to the earth of three-phase cable networks with insulated neutral without disconnecting the network from the station, characterized in that the potential of the phase relative to the earth is measured using a voltmeter that does not have its own consumption (for example, electrostatic
типа), и ток утечки при коротком замыкании той же фазы на землю, после чего величину полного сопротивлени определ ют путем делени показани вольтметра на показание амперметра.type), and the leakage current during a short circuit of the same phase to earth, after which the impedance value is determined by dividing the voltmeter reading by the ammeter reading.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU223A SU67079A1 (en) | 1944-02-21 | 1944-02-21 | Method for determining insulation impedance relative to earth of three-phase cable networks with insulated neutral |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU223A SU67079A1 (en) | 1944-02-21 | 1944-02-21 | Method for determining insulation impedance relative to earth of three-phase cable networks with insulated neutral |
Publications (1)
Publication Number | Publication Date |
---|---|
SU67079A1 true SU67079A1 (en) | 1945-11-30 |
Family
ID=51402262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU223A SU67079A1 (en) | 1944-02-21 | 1944-02-21 | Method for determining insulation impedance relative to earth of three-phase cable networks with insulated neutral |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU67079A1 (en) |
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1944
- 1944-02-21 SU SU223A patent/SU67079A1/en active
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