Abstract: A resistor for electric high-voltage apparatus, especially for connection to a diverter switch in an on-load tap changer for a high-voltage transformer. The diverter switch and the resistor are arranged in a housing with transformer oil. The resistor includes a number of resistor elements, wherein each resistor element includes a resistive element, arranged in a frame, which are electrically interconnected by a connection member. The frames are designed to enclose resistive elements that include spring elements formed from spirally wound resistance wire. Connection members include a connection plug. A method of mounting a resistor for electric high-voltage apparatus.

Abstract: A heating element, including a sensor conductor, two resistive conductors, with one resistive conductor arranged on one side of the sensor conductor and an other resistive conductor arranged on an other side of the sensor conductor such that the sensor conductor and the two resistive conductors are substantially parallel and plastic electrical insulation surrounding the sensor conductor and each resistive conductor.

Abstract: A high voltage low inductance resistor (120) includes a resistor body (122) having a perimeter and a center. A first terminal (126) is located away from the center of the resistor near the perimeter of the body (122). A serpentine resistance element (130) includes a first end (136). A conductive ring (124) is located near the perimeter and circumscribes the serpentine resistance element (130). The ring (124) is electrically connected to the first terminal (126). The first end (136) is electrically connected to the conductive ring (124). A first resistance segment (138a) of the resistance element (130) begins at the first end (136) and extends in a first direction generally around the perimeter of the body (122). An apex (142a) has an input portion (143) and an output portion (145). The apex (142a) redirects the resistance element in a generally opposite direction, the input portion (143) transitioning into the first resistance segment (138a).

Abstract: A plurality of protective resistors can be easily inserted between circuit forming elements, and opposite ends of each protective resistor can be properly press-contacted to each circuit forming element. The protective resistor can be easily replaced when broken. A resistor array board comprises a porous plate having a plurality of through-holes arranged in array and opening at opposite surfaces thereof; and a plurality of protective resistors removably loosely inserted into the through-holes, respectively. Each of the protective resistors are resiliently retained by an electrically conductive spring element, and opposite ends of each of the protective resistors are press-contacted with the circuit forming elements which are arranged in opposing relation on surfaces of the porous plates.

Abstract: A sheathed heater having a cylindrical metal sheath includes at least two rod shaped insulator core pieces that are separated from each other and inserted into the sheath along an axial direction of each core piece. Two or three lead pins separated from each other are inserted into the core pieces axially, and an internal heater coil segment is wound around each core piece. Adjacent ends of adjacent internal heater coil segments are electrically connected to the same lead pin, and the coil segments are connected across a single-phase or three-phase electric power source through the lead pins. A thermal and electric insulation material can be inserted between adjacent core pieces.

Abstract: A miniature resistive temperature detector is fabricated by winding wire about a ceramic, or equivalent, cement coated graphite mandrel or form having a greater length than the resulting detector, coating the wire except for the lead portion with a ceramic, or equivalent, cement and cutting the wire and breaking the form to produce the miniature detector. A plurality of miniature detectors may be fabricated on a single form or mandrel with space between each detector to facilitate breaking.

Abstract: An electric heating element, particularly of the cartridge type, comprising two elongated dielectric cores disposed within a metallic sheath. Each core has a plurality of longitudinally extending openings therein and more particularly one core has three longitudinal openings whereas the other has two openings. A resistance wire coil is wound on each of the cores, each coil having longitudinally spaced terminals. Three metal pins fit into predetermined core openings; one of the terminals of each resistance coil is electrically connected to one pin, the opposite terminal of one resistance coil is electrically connected to a second pin; and the opposite terminal of the other resistance coil is electrically connected to the third pin; whereby the one pin serves as a common electrical connection for both resistance coils, and the second and third pins serve as separate electrical connections to the respective resistance coils, whereby separate circuits may be established within the heating element.

Abstract: A high-voltage resistor unit comprising a chain of seriesconnected resistors in the form of hollow cylinders, each cylinder having a winding. Each resistor in the chain is provided with a screen in the form of a hollow cylinder with an additional winding enveloping the winding of the resistor in such a way that the potential at each point of said additional winding is equal to that at the respective point of the resistor winding. The additional winding also serves as a leaktight envelope for the resistor winding, protecting it from a liquid dielectric, placed wherein are said resistors with said screens.