Abstract

The method of the invention dynamically determines the optimal voltage set point for the on-load electrical tap changer (4) and the corresponding parameters of the automatic voltage regulator (3) so that they are in correspondence with each other, and generally comprises the following steps: obtaining (5) at least one variable and/or at least one parameter of an electrical network (6) comprising a high voltage side (7) and a low voltage side (8); generating (11) an electrical network model (6) and launching (12) a load flow or state estimate; calculating or estimating (13) voltage drops and load of electrical network lines (6); determining (14) the optimal voltage set point, and; setting (10) the control policy followed by the automatic voltage regulator (3) that controls the on-load tap changer (4).

IPC Classes  ?

• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
• G05F 1/147 - Regulating voltage or current wherein the variable is actually regulated by the final control device is AC using tap transformers or tap changing inductors as final control devices with motor driven tap switch
• H01F 29/04 - Variable transformers or inductances not covered by group with tappings on coil or windingVariable transformers or inductances not covered by group with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02J 3/16 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power

Abstract

Electrical insulation system with low environmental impact for medium- and high-voltage electrical switchgear. Electrical insulation system with low environmental impact for medium- and high-voltage electrical switchgear. The invention relates to an electrical insulation system comprising two fundamental elements: a) a gaseous medium formed by a mixture of i) one or more non-flammable hydrofluoroolefins with at least 4 carbon atoms and ii) one, two or three carrier gases selected from N2, O2, dry air, helium, CO2 or mixtures thereof; and b) one or more drying agents. Electrical insulation system with low environmental impact for medium- and high-voltage electrical switchgear. The invention relates to an electrical insulation system comprising two fundamental elements: a) a gaseous medium formed by a mixture of i) one or more non-flammable hydrofluoroolefins with at least 4 carbon atoms and ii) one, two or three carrier gases selected from N2, O2, dry air, helium, CO2 or mixtures thereof; and b) one or more drying agents. Electrical insulation system with low environmental impact for medium- and high-voltage electrical switchgear. Electrical insulation system with low environmental impact for medium- and high-voltage electrical switchgear. The invention relates to an electrical insulation system comprising two fundamental elements: a) a gaseous medium formed by a mixture of i) one or more non-flammable hydrofluoroolefins with at least 4 carbon atoms and ii) one, two or three carrier gases selected from N2, O2, dry air, helium, CO2 or mixtures thereof; and b) one or more drying agents. Electrical insulation system with low environmental impact for medium- and high-voltage electrical switchgear. The invention relates to an electrical insulation system comprising two fundamental elements: a) a gaseous medium formed by a mixture of i) one or more non-flammable hydrofluoroolefins with at least 4 carbon atoms and ii) one, two or three carrier gases selected from N2, O2, dry air, helium, CO2 or mixtures thereof; and b) one or more drying agents.

IPC Classes  ?

• H01B 3/56 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances gases
• H01H 33/22 - Selection of fluids for arc-extinguishing

Abstract

Load break or short-circuit currents switch (1) that can adopt at least three operating positions - connecting, interrupting, disconnecting - as well as a fourth, grounding position, said switch comprising a grounding contact for the latter case, thus compactly providing a load break or short-circuit currents switch capable of executing up to four operating positions (connecting, interrupting, disconnecting and grounding), which basically comprises a main circuit (2) for the circulation of electrical current and a secondary circuit (3) for circulation of electrical current in shunt, wherein the main circuit (2) comprises a switch - disconnector (4) equipped with a fixed contact (5) and a moving contact (6), and wherein the secondary circuit (3) comprises a vacuum switch (7) that in turn comprises a fixed contact (8) and a moving contact (9), the vacuum switch (7) being actuated by moving the moving contact (6) of the switch - disconnector (4) by means of a control mechanism (10).

IPC Classes  ?

• H01H 33/12 - Auxiliary contacts on to which the arc is transferred from the main contacts
• H01H 33/666 - Operating arrangements
• H01H 31/00 - Air-break switches for high tension without arc-extinguishing or arc-preventing means

Abstract

2222 or mixtures of same; and (b) one or more desiccants.

IPC Classes  ?

• H01B 3/56 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances gases
• H01H 33/22 - Selection of fluids for arc-extinguishing
• H02B 13/055 - Features relating to the gas

Abstract

The switching and protection means (1) of the present invention, for use in low-voltage switchboards, comprises a casing (9) wherein the following may be housed: at least one automatic circuit breaker (5) with at least two positions, an actuator means (6), a protection device (22) and a selector means (7), which in the case of an automatic three-way circuit breaker (5) enables the transmission of at least three switching positions (connection, disconnection and/or isolation and grounding) depending on the displacement of the actuator means (6) with two functional positions (C, D) and depending on the position of the selector means (7) with at least two positions (A, B). The switching and protection means (1), integrated within the casing (9), is installed on a structure (15) which may in turn be installed on the distribution bus-bar (12) of a low-voltage switchboard.

IPC Classes  ?

• H01H 9/10 - Adaptation for built-in fuses
• H01H 33/666 - Operating arrangements
• H02B 7/06 - Distribution substations, e.g. for urban network

Abstract

2CF—CN, for example, and one or more vector gases; and b) a molecular sieve capable of discriminating water molecules from molecules of other gases present in the gaseous medium of the system. The invention also relates to the use of the insulation system and to the medium- or high-voltage electrical switchgear comprising a complete enclosure in which there are arranged live electrical components and an electrical insulation system according to the invention.

IPC Classes  ?

• H01B 3/20 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
• C09K 3/00 - Materials not provided for elsewhere
• H01H 33/22 - Selection of fluids for arc-extinguishing
• H01B 3/56 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances gases
• H01B 3/00 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties
• H01H 33/56 - Gas reservoirs
• H02B 13/055 - Features relating to the gas

Abstract

The present invention relates to an on-load tap changer device, which allows the automatic regulation of voltage in the secondary winding (28) of high-voltage electrical equipment (26, 65) by selecting the number of turns of the primary winding (27) by means of an on-load tap changer device (1, 40), having reduced volume and weight, obtaining the highest possible number of transformation ratios without changing the constructive arrangement of the high-voltage electrical equipment (26, 65).

IPC Classes  ?

• H01H 9/00 - Details of switching devices, not covered by groups
• H01F 29/04 - Variable transformers or inductances not covered by group with tappings on coil or windingVariable transformers or inductances not covered by group with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

Abstract

The invention relates to a low-environmental-impact electrical insulation system comprising two essential elements: a) a gaseous medium formed by one or more highly fluorinated fluoroketones with between 4 and 12 carbons, at least one other additional dielectric gas, different from fluoroketones, with a vapour pressure at 0 °C greater than 500 mbar and less than 15000 mbar, such as fluoronitrile (CF3)2-CF-CN, and one or more carrier gases; and b) a molecular sieve that can separate water molecules from the molecules of other gases present in the gaseous medium of the system. The invention also relates to the use of the insulation system, as well as to medium- and high-voltage electrical switchgear comprising an enclosure containing low-voltage electrical components and an electrical insulation system according to the invention.

IPC Classes  ?

• H01B 3/00 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties
• H01B 3/56 - Insulators or insulating bodies characterised by the insulating materialsSelection of materials for their insulating or dielectric properties mainly consisting of organic substances gases
• H02B 13/055 - Features relating to the gas
• H01H 33/22 - Selection of fluids for arc-extinguishing

Abstract

The invention relates to a method for monitoring partial discharges in voltage distribution elements (4), both online and offline, of a high-voltage electrical power distribution network (2) provided with distribution elements (4). The method is performed using at least one measurement device (13, 14) and at least one device for the generation and injection of pulses of a pre-determined charge (1), such that, in a first step, the voltage of the distribution network (2) is tracked and, in a second step, by means of the generation and injection of a pulse having a pre-determined charge that is synchronised with the voltage of the network (2), the measurements of partial discharges are quantified using the measurement device (13, 14), independently of the configuration or topology of the distribution network (2). In turn, multiple measurement devices (13, 14) can be synchronised. This monitoring method can be used for the remote monitoring of the distribution network (2) as well as the remote management of the units (3, 3', 3") thereof.

IPC Classes  ?

• G01R 31/08 - Locating faults in cables, transmission lines, or networks
• H02H 1/00 - Details of emergency protective circuit arrangements