Abstract: A multipole molded case circuit breaker has a single handle assembly contained in a first pole along with a movable contact arm assembly. A second pole has a movable contact arm assembly connected to the first contact arm assembly by a crossbar member so that the arms move in unison during normal operation. Each pole contains a tripping mechanism for tripping the breaker pole. The breaker mechanisms are connected for uniform tripping of all poles.

Abstract: The invention concerns a system for monitoring the operating condition of a switch by utilizing one or more integrating stages to determine the switching capacity and prevent overstresses. One or more monitoring devices for current, switch action rate, arc quench chamber insulation, contact condition, mechanical condition, operating temperature, or contact voltage are provided, which report the equipment condition, particularly the switching capacity. The sensors are functionally connected with the switchgear drive via a processing stage. The current sensors, together with a counting device, can report the .intg. i.n.dt, i.e. a measure of the stressing of the switch, and in doing so can disable the drive of the equipment. The invention serves the early detection of switchgear which is no longer fully operational, so that these can be replaced before an overstress occurs.

Abstract: A solenoid actuated mechanical interlock is provided for the draw-out type circuit breaker mechanism of a motor control center. The interlock is formed by the plunger of the solenoid engaging a slot in the bellcrank mechanism of the draw-out unit. Electric circuitry controls operation of the solenoid so that the plunger is controllably extended and retracted to prevent or permit operation of the bell crank under certain conditions.

Abstract: A stationary contact assembly is provided for a circuit breaker which has a base, a line terminal and an arc chute. The stationary contact arm is J-shaped and formed from a single piece of conductive material which has a contact affixed to the short leg of the J and is connected to the line terminal. The short leg of the J has a length sufficient for creating electromagnetic blow open forces in response to current flow of a preselected magnitude. An arc runner is positioned between the legs of the J for drawing out an arc into the arc chute and intensifying the electromagnetic repulsion forces.

Abstract: The invention specifies a coil form which assures the possibility of production by automated means, a strain-relieved connection between external connecting lines, which can pass in an insulated fashion through an opening of a surrounding motor stator housing, and the coil winding ends of an exciter winding wound on the coil form. For this purpose connector sleeves are inserted and fixed in place to radially continuous, stepped diameter, fitting openings in a locking plastic bracket which is hinged-mounted by a plastic hinge on one end flange and which, after the connection has been made, can be swiveled over the exciter coil winding and locked on the other end flange. Around one set of sleeve ends of the connector sleeves which project out of the internal operating side of the plastic bracket, the coil winding ends of the exciter coil are wound.

Abstract: A high-speed, high-current making switch is provided which has a driver which forms an air cylinder in the housing and which has movable contacts attached thereto. The driver moves the contacts to make and break the circuit. The force to move the driver is provided by pressurized air within the housing chamber which in response to the operation of a solenoid which operates a latch allows the contacts to make very rapidly. Upon operation of the solenoid, the latch is removed from abutting contact with the driver thereby allowing the driver to move in response to the air pressure and make the circuit.

Abstract: An improved signal converter which isolates a measurement voltage by converting an analog signal into a pulse-width-modulated output signal. The converter has a first integrator followed in series by a threshold value controller whose output signal actuates at least one reversing switch element which supplies to the summing point of the first integrator at which the signal prevails, and to the threshold value controller, either a positive or negative reference voltage. This signal converter has a very low offset and a high linearity at high sampling rates. The signal also has a second integrator whose summing point is also connected to the signal input and output of the reversing switch element. The output signal of the second integrator is the reference signal of the first integrator. The linearity of the signal converter is thus exclusively dependent upon the parameters of the second integrator.

Abstract: In a first station operating as the rectifier, a fault indication quantity can replace the measured value of the HVDC voltage which regulates a control voltage. In normal operation in a second station of an HVDC transmission system operating as an inverter, a fault indication quantity is calculated from a control angle and the inductive D.C. voltage drop is calculated from the D.C. current and the A.C. voltage. In the second station operating as the inverter, the overlap angle can be precalculated from a fault indication quantity so that by automatic control of the control angle a preset extinction angle can be assured. Thereby stable, quickly controllable operation without any remote control signals is assured and rapid resumption of operation following a malfunction facilitated.

Abstract: The invention has developed an improved coil form permitting automated fabrication of a strain-relieved connection between external leads fed in an insulated fashion through an opening of a surrounding motor stator housing and the winding ends of the exciter winding wound on the coil form; for that purpose the design has a plastic bracket hinge-mounted and molded on an end flange of the coil form, which upon making the connection can be pivoted over the exciter winding and can then mate with the other end flange.

Abstract: The object of the invention is to develop an easily fabricated and assembled gear train arrangement, specifically a worm gear arrangement, which requires only a low overall height and at the same time assures operating reliability under extreme temperature ranges for application is motorized vehicle accessory drives such as power window lifts, wherein an output shaft mounted in a gear housing is linked in an elastic, slightly rotating connection to a worm wheel by way of a catch plate fastened to the output shaft, with the worm wheel being driven by a worm gear drive shaft which penetrates into the gear housing. In accordance with this invention the catch plate is designed as a single-piece plastic injection molding mounted onto the output shaft, with a first bearing bushing to mount the output shaft in the gear housing and a second bearing bushing mounted concentrically to the first bearing bushing to mount the worm wheel on the catch plate.

Abstract: The invention pertains to an uninterruptible power supply (UPS) with a rectifier supplied with power by a power network, connected to an intermediate circuit having a battery as well as to an inverter connected to the intermediate circuit for supplying an interruption protected power source. The control for the main input rectifier and the inverter is supplied using two secondary rectifiers, whose outpus are connected in parallel through decoupling diodes. The first secondary rectifier which supplies power to the control unit in normal operation, is connected to the input power network.

Abstract: An actuating magnet is provided for a circuit interrupter. The magnet yoke is assembled from three solid segments of magnetic material to produce a U-shaped core. One or more coils are disposed on the core loop, and the center of the yoke is interrupted by a series of aligned holes.

Abstract: A rotor for an electrical machine having standard axial cooling channels extending the length of the rotor, feeding regularly spaced radial cooling channels. The cooling distribution of the air flow coming into the rotor from the frontal sides is improved by blocking off some of the flow into the central radial channels, which in standard designs are excessively cooled, and thereby forcing the air flow to cool other radial channels better. By more evenly distributing the cooling air flow, less air flow is required, thereby saving energy. The invention is readily adaptable to various rotor configurations.

Abstract: An engine or a similar torque generator with internal torque M1 and moment of inertia T1 and an electrical drive with electrical torque M2 and moment of inertia T2 coupled thereto interchange an interchange torque MA over a coupling according to the equation M1=(MA) (1+(5 T)).sup.2 (1.sup.2 +(T1/T2))-M2,(T1/T2). Based on the actual values MA and M2 as well as a parameter (T1/T2)* and a model time constant T*, a model value M* is computed in accordance with this function, which indicates the actual internal torque if said parameters correspond to the actual parameters. Thus, using supplemental set values .DELTA.M2 the preset electrical torque is varied and the parameters calibrated in such a manner that the effect of the M2 variation on the model value virtually disappears.

Abstract: To simplify the fabrication and use of a transposed bar, the strip of insulating material for the strut projects higher than the conductor element stack and is incised along the longitudinal edges. Sections are formed, some of which (i.e., those immediately adjoining the offset location) are bent to be positioned below the offset points during the inserting of the strip. The non-incised surface of the strip serves as the strut of the transposed bar. The need for manual insertion of square- or diamond-shaped strips for additional insulation of the offset points is thereby eliminated. As the sections also contain a hardening resin, the internal corona shielding is improved.

Abstract: Method and Apparatus for resumption of normal operation of a High Voltage Direct Current transmission line after a malfunction in one of two stations connected to a HVDC transmission line. A control angle of approximately 90 degrees is run up in the previously malfunctioning station in accordance with a given function, thus creating an indication quantity at the D.C. voltage connections of the other station, which is detected as the earliest possible information on the start of the external station and also enables the run-up of the control angle in accordance with a given run-up function, with the two run-up functions representing precalculated, compatible, actual substitute values for the fault indication quantity caused by the respective other station. At the end of the run-up, the run-up functions are switched over to measured values of fault indication quantities, thus attaining stable control with short run-up and control times.

Abstract: A hammer brush holder assembly can be easily fabricated and assembled by robot automation using only a few simple steps. The brush holder has at least two brush support arms swivel-mounted at one end in a brush rocker and pressed against a commutator by a tension spring via the brushes which are held at the other end of the brush rocker. The brush support arms with sleeve-shaped ends can be slipped axially onto lugs molded in an axial fashion to the brush rocker and locked in place. Both brush support arms are connected as parts of a single-piece plastic injection-molded component with an integral breakaway bridge segment which holds both brush support arms to a preselected mutual spacing. The breakaway bridge segment can be eliminated after installation of the hammer brush support assembly in the commutator motor.

Abstract: A method and apparatus are described for operating a high voltage d.c. (HVDC) transmission line system connecting two a.c. transmission line systems during normal operation and during malfunction in either the rectifier station or the inverter station of the HVDC system.When a malfunction exists in one station of a HVDC transmission line, such as a rectifier station, then the regular thyristor firings are disabled and a bypass circuit, preferrably one or several bridge paths of a converter, are fired. As soon as a corresponding change in the current or voltage occurs at the d.c. voltage connections of the other station, this station assumes rectifier operation during which the HVDC transmission line is utilized as a reactive load to stabilize the other system. Once the malfunction has ceased to exist, operation is first resumed in the first station by extinguishing the bypass thyristors and subsequently resumed also in the other station.

Abstract: A surge suppressing resistor for a disconnect switch is provided which has its interior and exterior surfaces in fluid communication with the atmosphere to achieve a greater cooling effect. A glass epoxy stacking rod is supported between the end flanges of the resistor assembly and is used when two or more resistor bodies are to be joined together to form a unitary resistor assembly. The stacking rod is stressed and compressive forces hold the resistor bodies together as a unit for structural rigidity and electrical contact.

Abstract: A multi-component force and torque measurement cell which has strain gauges connected in each branch to a constant current source forming half-bridge circuits. These are arranged on a measurement spring with defined force introduction for longitudinal and transverse forces as well as torques in the strain direction of the measurement spring. The strain gauges are subdivided into two series circuits each having half the strain gauges and one constant current source connected at both ends to each other and to the ground. The measured voltages can be tapped between sequentially corresponding connecting points of immediately adjoining strain gauges in both series circuits.