369results about "Shutters/guards preventing contact access" patented technology

A closure device for a withdrawable rack adapted for receiving power circuit breaker includes a plate arrangement having at least two plates provided with openings and movable relative to one another so that the plate arrangement is changeable between an open position in which the openings of the plates are in alignment and a closed position in which the openings are out of alignment. An actuating mechanism is acted upon by the power circuit breaker as it is inserted to cause a movement of at least one of the plates to thereby change the plate arrangement between the closed and open positions. The actuating mechanism includes two V-shaped linkage assemblies. Each linkage assembly has two legs connected by a hinge to allow the linkage assembly to spread apart, with one of the legs having a free end which is connected to the at least one of the plates, and a coupler is connected to the hinge. Both couplers are jointly articulated to actuating element.

Contact protection system for power busbars having planar contact protection modules which each comprise holding feet for engaging behind the power busbars and latching elements for mutually latching with adjacent contact protection module, wherein the contact protection modules comprise for each power busbar a terminal-receiving region for receiving connecting terminals which are provided for electrically contacting the respective power busbar.

A shutter assembly is provided for an electrical system including at least one electrical switching apparatus, such as a circuit breaker, and a plurality of electrical bus members, and a plurality of electrical cable members, and a ground member with a plurality of contacts. Each of the conductors of the circuit breaker is removably coupled to a corresponding primary contact to electrically connect the circuit breaker to the electrical bus members and to electrically connect the circuit breaker to the electrical cable members and to electrically connect the circuit breaker to the ground members. The shutter assembly includes a flexible insulating member movably disposed between the conductors and the primary contacts. The flexible insulating member moves between a first position in which it provides access for the conductors to be coupled to the primary contacts, and a second position in which the flexible insulating member isolates and electrically insulates the bus member conductors from the primary contacts and the cable member conductors (“disconnected”) or isolates and electrically insulates the cable member conductors from the primary contacts and the ground member (“withdrawn”). An electrical switching apparatus and an electrical system employing the shutter assembly are also disclosed.

An apparatus for defeating an interlock for an electrical cabinet permits a technician qualified to service the equipment within the cabinet to defeat the interlock and open the cabinet while current is flowing through the equipment therein, while permitting the interlock to continue to resist unauthorized access to the interior of the cabinet.

A switching installation (5) having a circuit breaker (12), which is connected to a cable connection (33), and optionally a disconnector (14) for making or breaking a conductive connection between the cable connection (33) and a rail system (15), and an electrically insulating barrier (10). The electrically insulating barrier (10) surrounds at least the parts which are under electric voltage in operation from the circuit breaker (12) to the rail system (15), including a branch (18) leading to a rail (15) of the rail system, separately for each phase of the switching installation (5). Furthermore, inside the electrically insulating barrier (10) the switching installation may be provided with field-control means and/or voltage-sealing means (22, 25, 37).

The invention discloses a miniaturized switch cabinet of a handcart type, and relates to a switch cabinet. The miniaturized switch cabinet is characterized in that a left tongue plate fixing plate and a right tongue plate fixing plate are respectively mounted on a left side plate and a right side plate; a wall penetrating bushing is mounted above the right side plate, and a main busbar penetrates through the wall penetrating bushing; an upper contact box and an insulating cover are respectively mounted at the upper part and the lower part of a contact box mounting plate, the upper contact box is connected with the main busbar through a copper bar, and the insulating cover is connected with the upper end of a lower end busbar through screws; a current transformer is arranged in the middle of the lower end busbar in a penetrating manner, and the lower end of the lower end busbar is fixed on an earthing switch; the current transformer is fixed at the right part of a breaker base plate, and the earthing switch is fixed on the left side plate; the lower part of a conducting loop of the earthing switch is connected with an over-voltage protector. The miniaturized switch cabinet disclosed by the invention has a high level of protection. Through the adoption of a handcart type vacuum breaker in a side mounting manner, the width is small, the cost is reduced, the requirement that power distribution equipment is miniaturized is met, and the operation is safer and more reliable through an operation interlocking function.

The invention relates to a switch cabinet valve device and a switch cabinet using the same. The switch cabinet valve device comprises a guide base, wherein the guide base is provided with a touch installation cavity and more than two movable valves, the touch installation cavity is used for installing a stationary contact of a switch cabinet main loop, and the movable valves carry out guide movement along a forward and backward direction, are mutually nested and are successively in telescopic cooperation; the rear part of each movable valve is provided with a rear opening stop structure; the front part of each movable valve is provided with a closing stop structure which is used for carrying out backward stop cooperation with the corresponding closing stop structure arranged on the front part of an adjacent movable valve behind the movable valve; each movable valve is provided with an opening position and a closing position in the guide movement direction of the movable valve; the movable valve used for nesting on an innermost layer is in transmission connection with a driving mechanism used for driving the movable valve to move between the opening position and the closing position. The switch cabinet valve device can meet the use requirements of the switch cabinets arranged from front to rear in sequence in the main loop.

A circuit breaker assembly includes a housing, an electrical bus structure within the housing, a number of first plug-in members coupled to the bus structure, and a number of insulative retainers coupled to the bus structure. A corresponding one of the number of insulative retainers is operatively associated with a corresponding number of the number of first plug-in members. Each of a number of circuit breakers includes a manual operator and a number of second plug-in members disposed opposite the manual operator. The number of second plug-in members electrically engage a number of the number of first plug-in members. The corresponding one of the number of insulative retainers is disposed about the corresponding number of the number of first plug-in members, in order to insulate the corresponding number of the number of first plug-in members, and to retain the number of second plug-in members.

A data transceiver system may include an error corrector. The error corrector may include a plurality of delay units, each delay unit being configured to delay a corresponding data signal among a plurality of data signals by a time in response to a corresponding delay code among a plurality of delay codes and outputting the delayed data signal, an error detector configured to receive the plurality of delay codes, determine whether an error has occurred, and output an error signal according to the determination in a data frame lock operation, and a delay controller configured to set initial values of the plurality of delay codes to a predetermined value, vary and output each of the plurality of delay codes in response to a lock signal, and reset initial values the plurality of delay codes in response to the error signal in the data frame lock operation.

A passive arc control system for a motor control center 60 includes an arc attenuating box having sides separating adjacent vertical bus bar phases 54, providing a physical barrier to arc flash energy. The box is open at its top and bottom forming a chimney 55. A shutter assembly for each box includes an insulator cap 62 on a free end of the bus bar and an independently moveable, box-shaped shutter 64 that slides along the bus bar away from the insulator cap, when a device is connected to the bus bar. The shutter has an opening 65 through which the bus bar passes when the device is connected to the bus bar and an opening 55′ aligned with the box's chimney. The arc control system provides a high degree of arc protection for personnel working around open motor control centers and is highly modular and easy to construct.

The invention relates to a shielding contact box of a high-voltage switch cabinet, comprising a box body and a support plate, wherein the box body is formed in one step from mixed epoxy materials and in a cylinder shape, one end of the box body is provided with an opening, and the other end of the box body is closed; the outer wall of the box body and the support plate are both provided with umbrella skirts; and the inner cavity wall of the box body is provided with a nonmagnetic metal shielding layer, a static contact installing insert and a bus fixing insert which form an integral piece. The shielding contact box uses the nonmagnetic metal shielding layer to replace a net ring and especially embeds the nonmagnetic metal shielding layer into the bottom wall of the inner cavity of the box body so that the nonmagnetic metal shielding layer directly forms the integral piece with the static contact installing insert and the bus fixing insert, thereby not only uniformizing an electric field, reducing the partial insulator discharge, but also facilitating the elimination of corona by changing electric charge distribution direction and expanding phase spacing, so that the insulator can move in a better environment, thereby ensuring the safe operation of electric power.

The invention discloses a power box easy to quickly power off, comprising a box body, an inner box, a box cover, a clamping strip, a lock block, a lock hole and an unlocking device. A trigger is disposed on the power box to solve a problem. In the case of a power box failure or a state in which the box cover cannot be opened smoothly such that a main switch cannot be turned off, the unlocking device disposed on the top of the power box can be inserted into the lock hole to start the trigger so as to achieve quick power off. The trigger firstly eliminates a transient overvoltage generated by apower failure by a power isolation device so as to prevent the transient overvoltage from causing serious damage to equipment and affecting household lines, and secondly drives the magnetic coil of alever power-off device by the power isolation device to generate a sufficient magnetic field to disconnect a circuit, so as to power off the power box quickly without turning on the power box.

A double shutter shroud (5) and a flexible sheath (11) surrounding a stab (10) of an MCC unit, form a protective tunnel (30) for the stab to connect to a bus 4. A first shroud (6) mounted on the bus, includes a first gate (12). A second shroud (20) mounted on the MCC unit includes a second gate (24). When the MCC unit slides into an MCC section, a unit key (16) opens the first gate. When the stab is advanced toward the bus, a stab key (28) opens the second gate, forming a protective tunnel (30) from the flexible sheath and through the first and second shrouds. The protective tunnel protects the stab and bus from contamination, helps prevent dielectric breakdowns and short circuits between different phase busses, and protects an operator from electrical hazard of touching the bus or stab with tools or fingers.

Device for protection of a live element mounted on a support in an electrical distribution box, comprising an insulative cap adapted to cover the live element and retaining means adapted to retain the protection device fixed to the support. The protection device comprises an articulated junction adapted to couple the cap to the retaining means so that the cap is articulated relative to the retaining means in a first position in which the live element is electrically protected and a second position enabling access to the live element.

The invention relates to an anti-electric shock protection structure for high voltage equipment and the high voltage equipment. A box body of the high voltage equipment is provided with an openable box cover, and the box cover is locked at a closed position by a mechanical connection piece relative to the box body. The anti-electric shock protection structure comprises a low voltage loop and a socket connector, wherein the on-off state of at least one place of a high voltage loop in the high voltage equipment is controlled by a controller through the on-off of the low voltage loop; the socket connector is arranged on the high voltage equipment and shields the mechanical connection piece; the low-voltage loop is conducted through wires arranged in the connector; and when the connector is taken off, the low voltage loop is opened. The above technical scheme has the advantages that electric shock hazard is eliminated, the design, manufacture and use are facilitated, and the cost is effectively reduced.