MODIFICATIONS OF DIODE RECTIFIER CIRCUITS FOR CONTINUOUS INSULATION MEASUREMENT IN LIVE AC IT NETWORKS

Authors

  • P. Olszowiec Elporem i Elpoautomatyka Spółka z o.o., Poland

DOI:

https://doi.org/10.20998/2074-272X.2016.2.08

Keywords:

low voltage AC IT networks, insulation resistance, diode rectifier, insulation resistance decline alarming, earth fault location

Abstract

Purpose. In the paper there are described few systems of insulation resistance continuous measurement using an imposed DC test signal delivered by diode rectifiers. Drawbacks of this technique are pointed out and ways of these shortcomings removal are proposed. Methodology.  An improved version of measuring circuit based on a single-phase diode rectifier is presented. Application of logometric measuring devices is suggested. Results. A new insulation resistance continuous measuring system is insensitive to network voltages variation and asymmetry. Modified circuit enables also implementation of a simple device for alarming the monitored network’s insulation deterioration and/or earth-fault protection. Originality. Formulas describing performance of diode rectifiers under asymmetrical supply have not been available so  far. Both innovations (i.e. single-phase diode rectifier and logometric meter) have not been applied widely for implementation of continuous insulation monitoring in live AC IT networks. Practical value.  Use of both innovations will allow to eliminate unrequired dependence of measurement results on variable network voltages as well as their possible asymmetry. Exploitation of diode rectifier circuits for earth fault location is also possible.

Author Biography

P. Olszowiec, Elporem i Elpoautomatyka Spółka z o.o.

MSc., Electrical Engineer

References

1. Hofheinz W. Protective Measures with Insulation Monitoring. VDE Verlag, 1998.

2. Tsapenko E.F. Kontrol' izoliatsii v setiakh do 1000 V [Insulation monitoring in networks up to 1000 V]. Moscow, Energiya Publ., 1972. (Rus).

3. Tsapenko E.F. Zamykaniia na zemliu v setiakh 6-35 kV [Earth faults in networks 6-35 kV]. Moscow, Energoatomizdat Publ., 1986. (Rus).

4. Olszowiec P. Unconventional Methods of Analyzing Diode Rectifiers with Asymmetrical Supply. Computational Problems of Electrical Engineering, 2014, no.2, pp. 33-36.

5. Olszowiec P. O wyznaczaniu napięć trójfazowych prostowników diodowych. Wiadomości Elektrotechniczne, 2015, vol.1, no.10, pp. 33-34. doi: 10.15199/74.2015.10.8.

6. Olszowiec P. Insulation Measurement and Supervision in Live AC and DC Unearthed Systems. Lecture Notes in Electrical Engineering, 2nd edition. Springer, 2014. doi: 10.1007/978-3-642-29755-7.

Published

2016-05-18

How to Cite

Olszowiec, P. (2016). MODIFICATIONS OF DIODE RECTIFIER CIRCUITS FOR CONTINUOUS INSULATION MEASUREMENT IN LIVE AC IT NETWORKS. Electrical Engineering & Electromechanics, (2), 43–46. https://doi.org/10.20998/2074-272X.2016.2.08

Issue

Section

Power Stations, Grids and Systems