Abstract: A multi-stage pump includes a first set of pump stages directing fluid in a first direction from a first end of the multi-stage pump to a diffuser casing disposed at a central portion of the multi-stage pump. A second set of pump stages directs the fluid expelled from the diffuser casing in a second direction, opposite to the first direction, from a second end of the multi-stage pump to the diffuser casing. The diffuser casing receives the fluid from the first set of pump stages and directs the fluid toward the second end of the multi-stage pump and receives the fluid from the second set of pump stages and directs the fluid in a radial direction with respect to a longitudinal axis of the multi-stage pump.

Abstract: A modular and adaptable power system may be used to provide electrical power connections in an industrial work site, such as a mine. The system provides a plug-and-play interchangeable output module that can be quickly and easily disconnected from and reconnected to a separate and independent input/feed-through module. This allows a user to daisy chain multiple input/feed-through modules together, thereby greatly reducing setup time. Output modules can be quickly disconnected and relocated and returned to previous locations and reconnected.

Abstract: Arrangements for promoting the restriction of fluid flow along a shaft via providing a deformable ring member in an annulus between the shaft and housing. In an initial general condition, the deformable ring member permits free fluid flow in a general direction along the shaft while in a second, constricted condition, the deformable ring closes or blocks a gap or clearance normally conducive to free fluid flow to thereby restrict fluid flow. An actuation medium, which can take any of a very wide variety of forms, preferably promotes constriction of the deformable ring member directly or indirectly.

Abstract: A modular and adaptable power system may be used to provide electrical power connections in an industrial work site, such as a mine. The system provides a plug-and-play interchangeable output module that can be quickly and easily disconnected from and reconnected to a separate and independent input/feed-through module. This allows a user to daisy chain multiple input/feed-through modules together, thereby greatly reducing setup time. Output modules can be quickly disconnected and relocated and returned to previous locations and reconnected.

Abstract: A heat shield for a thrust bearing assembly of a pump. The heat shield includes a member having an inner surface and an outer surface. A raised flange is formed on a perimeter of the inner surface. The raised flange is configured to seal with a back surface of a thrust shoe holder, and form a cavity between the inner surface and the back surface of the thrust shoe holder. At least one weep hole is on the flange. The weep hole is configured to allow water to enter the cavity to form an insulating stagnant water layer.

Abstract: A control system for a harmonic neutralized frequency changer. The control system includes a processor, a narrow band harmonic controller and a fundamental current controller. The narrow band harmonic controller is communicably connected to the processor and is configured to reduce a positive sequence component, a negative sequence component and a zero sequence component of a harmonic generated by a cycloconverter of the harmonic neutralized frequency changer. The fundamental current controller is communicably connected to the processor and is configured to reduce a fundamental frequency component of current flowing in a neutralization inverter of the harmonic neutralized frequency changer.

Abstract: Switchgear which combines a visible disconnect switch and a circuit breaker or interrupter capable of interrupting fault currents. The switchgear includes a carriage and a switch actuator connected to the carriage for moving the carriage between a switch-closed position and a switch-open position. A circuit breaker module includes circuit breaker contacts, as well as first and second contactor terminals. The circuit breaker module provides selective electrical connection between the contactor terminals depending on the state of the circuit breaker contacts. A fixed disconnect switch contact us attached to or comprises one of the first and second contactor terminals, and a movable disconnect switch contact is mounted to the carriage so as to move with the carriage. The fixed disconnect switch contact and the movable disconnect switch contact are positioned for selective engagement with each other as the carriage moves to the switch-closed position.

Abstract: Equipment including an assembly structure defining an interior, and including a panel and a viewing window in the panel. An electro-mechanical operating device is located within the interior. The electro-mechanical operating device has at least two visually-distinguishable operational states, and is positioned such that the operational state of the electro-mechanical operating device can be visually observed through the viewing window. An illumination device within the interior emits light of at least two different colors corresponding to the at least two visually-distinguishable operational states of the electro-mechanical operating device. Electrical circuitry includes a switch for sensing the operational state of the electro-mechanical operating device and connected for controlling the illumination device.

Abstract: A system. The system includes a processor, a first module, a second module and a third module. The first module is communicably connected to the processor and is configured for calculating a q-axis voltage component and a d-axis voltage component. The second module is communicably connected to the processor and is configured for determining a voltage angle relative to the q-axis. The third module is communicably connected to the processor and is configured for (1) comparing the determined voltage angle to a predetermined value, (2) outputting the determined voltage angle if the determined voltage angle is less than the predetermined value, and (3) outputting the predetermined value if the predetermined value is less than the determined voltage angle.

Abstract: A blown fuse detector of the general type which monitors voltage drop across a fuse. Embodiments of the invention in particular are applicable to medium voltage AC fuse circuits, operating within the approximate voltage range 2,400 to 38,000 volts. The blown-fuse detector includes first and second electrical connection structures for electrically connecting the first and second conductor portions to the first and second fuse terminals, respectively. A voltage differential detector circuit has first and second differential inputs and is operable to generate a detector output when the voltage across the differential inputs exceeds a predetermined of threshold voltage. First and second capacitors capacitively couple the first and second electrical connection structures to the first and second differential inputs, respectively, the capacitors serving as capacitively-coupled voltage sensors.

Abstract: A disconnect mechanism, an electrical component assembly including the disconnect mechanism, and an electrical circuit protector in turn including the electrical component assembly. The disconnect mechanism includes a carriage, as well as a switch actuator connected to the carriage for moving the carriage between a switch-closed position and a switch-open position. A contactor is mounted to the carriage so as to move with the carriage, the contactor including first and second contactor terminals and providing selective electrical connection between the contactor terminals. A movable disconnect switch contact is connected to the first contactor terminal, and is movable with the carriage and the contactor. A fixed disconnect switch contact is positioned for selective engagement with the movable disconnect switch contact as the carriage moves to the switch-closed position.

Abstract: Arrangements for promoting the restriction of fluid flow along a shaft via providing a deformable ring member in an annulus between the shaft and housing. In an initial general condition, the deformable ring member permits free fluid flow in a general direction along the shaft while in a second, constricted condition, the deformable ring closes or blocks a gap or clearance normally conducive to free fluid flow to thereby restrict fluid flow. An actuation medium, which can take any of a very wide variety of forms, preferably promotes constriction of the deformable ring member directly or indirectly.

Abstract: A circuit breaker module (which may also be termed an interrupter) including circuit breaker contacts which are opened and closed by an electrically-activated magnetic actuator and capable of interrupting fault currents. The magnetic actuator is stable in either a breaker-closed state or a breaker-open state without requiring electrical current flow through the magnetic actuator. An externally-connectable mechanical drive is linked to the magnetic actuator in a manner such that movement of the externally-connectable mechanical drive can destabilize the breaker-closed state to open the circuit breaker contacts. An external actuator activated by an external condition is connected to said externally-connectable mechanical drive so as to cause said circuit breaker contacts to open upon occurrence of the external condition.

Abstract: A draw-out control compartment including a drawer housing open opposite a drawer housing rear wall to define a front opening. A control component support structure is received within the drawer housing and supported on drawer slides. A cable storage compartment is adjacent a rear wall of the drawer housing on the exterior side thereof, and opens into the housing interior. A control cable is attached to the control component support structure and extends into the cable storage compartment. The control cable has a length which permits the drawer-like control component support structure to be pulled out of the drawer housing with the control cable remaining attached, with excess length of the control cable when the control component support structure is all the way within the drawer housing being stored within the cable storage compartment.

Abstract: Electrical switchgear which combines, connected electrically in series, a visible disconnect switch (operated by a main switch actuator) and a circuit breaker module (which may also be termed an interrupter) including circuit breaker contacts which are opened and closed by an electrically-activated magnetic actuator and capable of interrupting fault currents. The magnetic actuator is stable in either a breaker-closed state or a breaker-open state without requiring electrical current flow through the magnetic actuator. An interlock is provided such that, as the main switch actuator begins to move from its switch-closed position to its switch-open position, the breaker-closed state is destabilized to open the circuit breaker contacts. An interlock is also provided such that the circuit breaker contacts cannot close while the visible disconnect switch is open.

Abstract: Arrangements for promoting the restriction of fluid flow along a shaft via providing a deformable ring member in an annulus between the shaft and housing. In an initial general condition, the deformable ring member permits free fluid flow in a general direction along the shaft while in a second, constricted condition, the deformable ring closes or blocks a gap or clearance normally conducive to free fluid flow to thereby restrict fluid flow. An actuation medium, which can take any of a very wide variety of forms, preferably promotes constriction of the deformable ring member directly or indirectly.

Abstract: Switchgear which combines a visible disconnect switch and a circuit breaker or interrupter capable of interrupting fault currents. The switchgear includes a carriage and a switch actuator connected to the carriage for moving the carriage between a switch-closed position and a switch-open position. A circuit breaker module includes circuit breaker contacts, as well as first and second contactor terminals. The circuit breaker module provides selective electrical connection between the contactor terminals depending on the state of the circuit breaker contacts. A fixed disconnect switch contact us attached to or comprises one of the first and second contactor terminals, and a movable disconnect switch contact is mounted to the carriage so as to move with the carriage. The fixed disconnect switch contact and the movable disconnect switch contact are positioned for selective engagement with each other as the carriage moves to the switch-closed position.

Abstract: A two-level two-terminal modular multilevel converter subsystem. The subsystem includes a first capacitor and a second capacitor. The modular multilevel converter subsystem is configured to selectively place the first capacitor in series with the second capacitor. The modular multilevel converter subsystem is also configured to selectively place the first capacitor in parallel with the second capacitor relative to first and second output terminals of the modular multilevel converter subsystem.

Abstract: A modular multilevel converter system. The system includes a plurality of series connected two-terminal M2LC subsystems and a control system module. The two-terminal M2LC subsystems are arranged into at least two output phase modules. A first one of the output phase modules defines a total value of inductance and includes a positive arm and a negative arm. The control system module is configured to apply selectively reassigned modulated switch functions to only one of the following at a given instance of time: the two-terminal M2LC subsystems of the positive arm of the first one of the output phase modules or the two-terminal M2LC subsystems of the negative arm of the first one of the output phase modules. The selective reassigning of the modulated switch functions forces charge balance of the individual capacitors of the series connected two-terminal M2LC subsystems at a predetermined rate.