摘要:
An acoustic sensor apparatus includes a housing; a clamp structured to clamp together the housing and an electrical power conductor; an acoustic sensor structured to detect acoustic noise from the electrical power conductor and output a signal; and a circuit structured to detect an electrical conductivity fault from the signal.
摘要:
An electrical switching apparatus includes a number of poles each having an elongated conductor with a first end and an opposite second end with a first terminal member. A circuit interrupter is electrically connected in series with the elongated conductor at the first end. A second terminal member electrically engages the first terminal member. A number of insulative skirts are disposed on the elongated conductor between opposite ends thereof. An insulative tube receives the insulative skirts and includes a first open end and an opposite second end carrying the second terminal member. A carrier carries the poles between (a) a first position in which the first terminal member electrically engages the second terminal member and the insulative tube receives the insulative skirts, and (b) a second position in which the first terminal member is electrically disconnected from the second terminal member and the skirts are withdrawn from the insulative tube.
摘要:
An electrical switchgear comprises a front, a back and a switch arrangement. The switch arrangement comprises a terminal arrangement comprising an electrical contact for a bus and an electrical contact for a load connection which are spaced apart along an axial direction; and a device that is driveable into said terminal arrangement to a service position to make an electrical connection between said electrical contact for said load connection and said electrical connection for said bus. The electrical contact for said load connection is located closer to said back of said switchgear than is said electrical contact for said bus.
摘要:
A string includes direct current electrical generating modules electrically connected in series to form a first end and a remote second end. A power line is electrically connected to one DC EGM at the first end. A return line is electrically connected to another DC EGM at the remote second end. A first string protector is in the power line of the string, and a second SP is in the return line of the string at the remote second end. One of the first and second SPs includes a number of an over current protector, an arc fault protector, a reverse current protector and a ground fault protector. The other one of the first and second SPs includes a number of an over current protector, an arc fault protector, a reverse current protector, a ground fault protector, and a remotely controlled switch in series with the power or return lines.
摘要:
A circuit breaker (22) includes separable contacts (40) for movement between a closed position and an open position. An operating mechanism (46), which moves the separable contacts (40) between the closed and open positions, has a closed state and a open or tripped state which corresponds to the open position. A current transformer (50) senses electrical current flowing through the separable contacts (40) as a sensed current. A trip mechanism (48) employs the sensed current for tripping the operating mechanism (46) to the tripped position to move the separable contacts (40) to the open position. The trip mechanism (48) includes a microprocessor (56,µP) which generates short delay and ground fault trip functions of electrical current and time. The microprocessor (56,µP) inputs a first interlock signal from a downstream electrical switching device (26) which generates the first interlock signal with a first value when curtent through the downstream device (26) exceeds a predetermined value and with a second value otherwise. The microprocessor (56,µP) generates and outputs a second interlock signal to an upstream electrical switching device (24) in response to both of the first and second trip functions. The trip mechanism (48) selectively trips the operating mechanism (46) as a function of the first interlock signal, the first trip function, and the second trip function.
摘要:
An acoustic sensor system is for an electrical distribution system having a number of phases. The acoustic sensor system comprises: a plurality of sets of acoustic sensors structured to detect an electrical conductivity fault of the electrical distribution system. Each of the plurality of sets includes a number of acoustic sensors. Each of the number of acoustic sensors is for a corresponding one of the number of phases of the electrical distribution system.
摘要:
An electrical switchgear comprises a front, a back and a switch arrangement. The switch arrangement comprises a terminal arrangement comprising an electrical contact for a bus and an electrical contact for a load connection which are spaced apart along an axial direction; and a device that is driveable into said terminal arrangement to a service position to make an electrical connection between said electrical contact for said load connection and said electrical connection for said bus. The electrical contact for said load connection is located closer to said back of said switchgear than is said electrical contact for said bus.
摘要:
A switch arrangement for an electrical switchgear comprising a first bus, a second bus and a load connection. The switch arrangement comprises a breaker; wherein said breaker is moveable in said switchgear between a first position and a second position, such that in use, when said breaker is in said first position and closed it electrically connects said first bus to said load connection, and when said breaker is in said second position and closed it electrically connects said second electrical bus to said load connection, with said first electrical bus disconnected from said load connection.
摘要:
A circuit breaker (22) includes separable contacts (40) for movement between a closed position and an open position. An operating mechanism (46), which moves the separable contacts (40) between the closed and open positions, has a closed state and a open or tripped state which corresponds to the open position. A current transformer (50) senses electrical current flowing through the separable contacts (40) as a sensed current. A trip mechanism (48) employs the sensed current for tripping the operating mechanism (46) to the tripped position to move the separable contacts (40) to the open position. The trip mechanism (48) includes a microprocessor (56,µP) which generates short delay and ground fault trip functions of electrical current and time. The microprocessor (56,µP) inputs a first interlock signal from a downstream electrical switching device (26) which generates the first interlock signal with a first value when curtent through the downstream device (26) exceeds a predetermined value and with a second value otherwise. The microprocessor (56,µP) generates and outputs a second interlock signal to an upstream electrical switching device (24) in response to both of the first and second trip functions. The trip mechanism (48) selectively trips the operating mechanism (46) as a function of the first interlock signal, the first trip function, and the second trip function.