FIELD: electrical installations differential protection.
SUBSTANCE: invention relates to devices for the differential protection of electrical installations, responsive to ground faults, line breaks and arcs, as well as overcurrents, an increase in transient and linear resistances. The effect is achieved due to a design in which, to combine two differential current devices, one pair of auxiliary contacts is selected as closing, and the second as opening, while the auxiliary contacts are connected in a series electrical circuit with a capacitor and a resistor between the input and output terminals of different poles of the differential current device with an opening pair of auxiliary contacts. Additionally, the specified connection of auxiliary contacts can be repeated for an even number of pairs of auxiliary contacts of two or more residual current devices.
EFFECT: significant expansion of the arsenal of technical means for synchronizing differential current devices.
2 cl, 9 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| ELECTRICAL INSTALLATION CONTROL AND PROTECTION SYSTEM | 2020 |
|
RU2737951C1 |
| DEVICE FOR PROVIDING DIFFERENTIAL PROTECTION OF D.C. NETWORK SECTIONS | 0 |
|
SU1105974A1 |
| DEVICE FOR DEFERENTIAL PROTECTION OF DC NETWORK PORTIONS | 0 |
|
SU832644A2 |
| ARRANGEMENT FOR DIFFERENTIAL PROTECTION OF DC NETWORK PORTIONS | 0 |
|
SU723716A1 |
| MINE ELECTRIC LOCOMOTIVE POWER CIRCUITRY PROTECTION DEVICE | 0 |
|
SU765041A1 |
| DEVICE FOR CURRENT PROTECTION OF POWER LINES WITH SINGLE- SIDE SUPPLY | 0 |
|
SU1713009A1 |
| METHOD FOR MEASURING RESISTANCE OF CONNECTIONS ISOLATION IN BRANCHED NETWORKS OF DIRECT AND ALTERNATING CURRENT, AND DEVICE FOR ITS REALIZATION | 2004 |
|
RU2275645C2 |
| ELECTRICAL APPARATUS FOR DIFFERENTIAL PROTECTION WITH TESTING CIRCUIT | 1996 |
|
RU2154332C2 |
| DEVICE FOR DIFFERENTIAL PROTECTION OF DC NETWORK SECTIONS | 0 |
|
SU964839A1 |
| DEVICE FOR PROTECTIVE DISCONNECTION OF ELECTRIC INSTALLATION IN SOLIDLY GROUNDED NEUTRAL WIRE MAINS | 0 |
|
SU943958A1 |
