PL206848B1 - A system for measuring the leakage current in a three-phase network - Google Patents
A system for measuring the leakage current in a three-phase network Download PDFInfo
- Publication number
- PL206848B1 PL206848B1 PL378067A PL37806705A PL206848B1 PL 206848 B1 PL206848 B1 PL 206848B1 PL 378067 A PL378067 A PL 378067A PL 37806705 A PL37806705 A PL 37806705A PL 206848 B1 PL206848 B1 PL 206848B1
- Authority
- PL
- Poland
- Prior art keywords
- phase network
- measuring
- leakage current
- current
- leakage
- Prior art date
Links
- 238000005259 measurement Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Description
Opis wynalazku Przedmiotem wynalazku jest uk lad do pomiaru pr adu up lywno sciowego w sieci trójfazowej, sto- sowany zw laszcza w zabezpieczeniach wieloodp lywowych sieci trójfazowych. Pr ad up lywno sciowy jest to pr ad pojawiaj acy si e w wyniku uszkodzenia izolacji przewodów i p lyn acy do ziemi. Znane rozwi azania uk ladu pomiaru pr adu up lywno sciowego w sieci trójfazowej zbudowane s a z uk ladu zród la pr adu sta lego, d lawika i uk ladu mierz acego spadek napi ecia na oporno sci up lywno- sciowej. Takie rozwi azanie nie umo zliwia selektywnego pomiaru w sieci wieloodp lywowej. Inne znane rozwi azania zbudowane s a z uk ladu generowania pr adu zmiennego impulsowego i przek ladników ró znicowych zmiennopradowych oraz uk ladów logicznych do wykrywania odp lywu, w którym wyst api la up lywnosc. Uk lad do pomiaru pr adu up lywno sciowego w sieci trójfazowej wed lug wynalazku zbudowany jest ze zród la pr adu sta lego, polaczonego z zespo lem d lawików, który to zespó l jest dolaczony do dop lywu sieci trójfazowej, która zawiera w ka zdym odp lywie przek ladnik sta lopr adowy wykrywaj acy pr ad sta ly up lywno sciowy p lyn acy przez oporno sc up lywu. Przemienne pr ady robocze wyst epuj ace w odp lywach wytwarzaj a wzajemnie znosz ace si e pola magnetyczne zmienne i dlatego nie s a wykrywane przez przek ladniki sta lopr adowe. Zalet a uk ladu wed lug wynalazku jest proste ustalenie, w którym odp lywie wyst epuje up lywno sc bez potrzeby stosowania filtrów i dodatkowych uk ladów logicznych. Przedmiot wynalazku przedstawiony jest w przyk ladzie wykonania na rysunku, w postaci sche- matu. Uk lad do pomiaru pr adu up lywno sciowego w sieci trójfazowej sk lada si e ze zród la pr adu sta le- go ZPS po laczonego z zespo lem dlawików L, który to zespó l jest do laczony do dop lywu DO sieci trój- fazowej. Na odp lywach OD sieci trójfazowej umieszczone s a przek ladniki sta lopr adowe PS wykrywa- jace pr ad sta ly IS p lyn acy przez oporno sc up lywu RU. Wykrycie pr adu sta lego IS w danym odp lywie przekraczaj acego warto sc graniczn a tego pr adu wskazuje na istnienie up lywno sci w tym odp lywie. PLDescription of the invention The subject of the invention is a system for measuring leakage current in a three-phase network, used especially in multi-leakage protection of three-phase networks. The leakage current is the current that appears as a result of damage to the insulation of conductors and flows to the ground. The known solutions of the leakage current measurement system in a three-phase network are composed of a DC source system, a tube junction and a system measuring the voltage drop to leakage resistance. Such a solution does not allow for selective measurement in a multi-outlet network. Other known solutions consist of a pulsed alternating current generation system and AC differential transformers as well as logic circuits for detecting outflow in which there is a leakage. The system for measuring the leakage current in a three-phase network according to the invention is built from a DC source connected to a set of lugs, which set is connected to the inlet of the three-phase network, which contains in each Low voltage constant current transformer detecting the direct current, the batch fluid flows through the resistance of the flow. The alternating operating currents present in the outflows generate mutually canceling alternating magnetic fields and are therefore not detected by the DC current transformers. The advantage of the system according to the invention is that it is easy to determine in which outflow there is a flow of liquid without the need for filters and additional logic. The subject of the invention is presented in an exemplary embodiment in the drawing in the form of a diagram. The system for measuring the leakage current in a three-phase network consists of a source of direct current ZPS connected with the set of chokes L, which set is connected to the inflow DO of the three-phase network. On the outgoing OD outlets of a three-phase network, there are PS constant current transformers, which detect direct current IS flowing through the resistance sc of the flow RU. The detection of the direct current IS in a given outflow exceeding the limit value of this current indicates the existence of leakage in this outflow. PL
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL378067A PL206848B1 (en) | 2005-11-16 | A system for measuring the leakage current in a three-phase network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL378067A PL206848B1 (en) | 2005-11-16 | A system for measuring the leakage current in a three-phase network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL378067A1 PL378067A1 (en) | 2007-05-28 |
| PL206848B1 true PL206848B1 (en) | 2010-09-30 |
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