63results about "Reversal of power transmission direction" patented technology

A power generation and control system is easily installed in a consumer household, a business, or an end-user establishment for generating power and preventing power from flowing to a power grid from a consumer circuit during a power outage A communications transceiver is adapted to transmit a permission signal for allowing power generation only after the control system has been installed. The control system can be adapted to replace an existing circuit breaker in a household circuit breaker box and prevents power from traveling from consumer power generators to the grid during a power outage. In the same manner that end-users can add appliances to existing circuits, end-users can easily add additional power generation devices without hiring a professional electrician and without worrying about causing harm to utility workman during power outages.

In a circuit device, a plurality of protection circuits are disposed between a plurality of first power supply connecting terminals and a first input terminal of a load circuit. A switching element of each of the plurality of protection circuits is connected between a first power supply connecting terminal and a first input terminal, and is turned on when a DC power supply is connected with a normal polarity to the first power supply connecting terminal. Each of the plurality of protection circuits a parasitic diode that is connected in parallel to the switching element between a corresponding first power supply connecting terminal and a first input terminal in a direction where a current having a normal polarity is caused to flow. The reset circuit performs periodically a reset operation of temporarily turning off the switching element.

A device includes a first thyristor element configured to be coupled to a first voltage line and a second voltage line, wherein the first voltage line is configured to transmit power in a first phase and the second voltage line is configured to transmit power in a second phase. The device includes a second thyristor element configured to be coupled to the second voltage line and a third voltage line, wherein the third voltage line is configured to transmit power in a third phase. The device includes a third thyristor element configured to be coupled to the first voltage line and the third voltage line.

An embodiment high efficiency power regulator comprises a three-terminal converter and a protection device. The three-terminal converter comprises a first terminal coupled to a positive terminal of an input voltage bus, a second terminal coupled to a positive terminal of an output voltage bus and a third terminal coupled to the protection device. The protection device comprises an inrush current limiting element connected in series with a reverse polarity protection device.

A system having input terminals including line and neutral terminals for receiving AC power from a first AC source and having output terminals including output line and neutral terminals for receiving AC power from output terminals of a second AC source and for supplying AC power to a load, has a transfer switch configurable to connect the input terminals to the output terminals or to isolate the input terminals from the output terminals. When the transfer switch is configured to isolate the output terminals from the input terminals, the second AC source is caused to cease supplying power to the output terminals when a first voltage signal and an input current signal indicate the voltage and the input current satisfy a first set of criteria.

A control system and method for sectionalizing switches and pulse-testing interrupter/reclosers in a distribution grid feeder which enables fault location, isolation and service restoration without requiring an external communications infrastructure to pass information between the switches. The method includes switches entering an armed state when they experience a high fault current during an initial fault event. Then, when the interrupter/recloser runs its test pulse sequence, any armed switch counts all test pulses as fault pulses, while non-armed switches count the test pulses as load pulses. Switches open to isolate the fault based on threshold values of fault pulse count and load pulse count. When an initially active interrupter/recloser completes its test pulse sequence, another interrupter/recloser begins its sequence, and all switches reconfigure their threshold values based on the new interrupter/recloser. Interrupter/reclosers after the initial device use a fast close-open event if necessary to arm some switches for proper fault-count opening.

A network service and transformer safety protector on a secondary side of a network transformer tank system. The network service and transformer safety protector is positioned between the network transformer and a secondary network distribution system and is configured to connect and disconnect a transformer from the secondary network. The network service and transformer safety protector is attached to the outside of the transformer tank.

An overvoltage clipping device for clipping an overvoltage occurring at a main transformer of a wind turbine is provided. The overvoltage clipping device includes a detection unit for detecting an actual voltage level at the main transformer. The determination unit which is operatively connected to the detection unit determines whether the actual voltage level is above a predetermined reference voltage level. At least one switching unit is provided which is operatively connected to the determination unit for electrically coupling at least two transformer terminals of the main transformer. The control unit drives the switching unit if the detected actual voltage level is above the predetermined reference voltage level such that the at least two transformer terminals are electrically coupled to each other by the switching unit.

The invention discloses a cutoff device and cutoff method for preventing electrification of primary equipment during relay protection debugging of a substation, and solves the problem of electrification by mistake of the primary equipment during the relay protection debugging of the substation. A closed detection loop comprises a detection circuit microprocessor (20), a voltage relay normally-open contact (14) and a detection circuit power supply (19), a current relay normally-closed contact (26) is connected in series to a connection line between a relay protection tester (9) and a relay protection tester external power supply (29), a cutoff circuit power supply (28), a current relay coil (25) and a triode switch (24) are connected in series to form a cutoff loop, an output control end of a cutoff circuit microprocessor (23) is connected to a base of the triode switch (24), and a cutoff signal is used for controlling the triode switch (24) to be conducted and the current relay normally-closed contact (26) to be disconnected by the cutoff circuit microprocessor (23).

A power system for ultraviolet lighting includes a first network transformer structured to be powered from a first medium voltage power source and to output a first low voltage output; and a second network transformer structured to be powered from a second medium voltage power source and to output a second low voltage output. A first network protector inputs the first low voltage output of the first network transformer and outputs a third output. A second network protector inputs the second low voltage output of the second network transformer and outputs a fourth output. A spot network is powered from the third output of the first network protector and from the fourth output of the second network protector. A number of sag ride thru devices include an input powered from the spot network and an output structured to power a number of ultraviolet lights.

A protection circuit is connected between an interface circuit and a main circuit of an electronic device. The interface circuit is for providing a path for a power supply to power the main circuit. The protection circuit includes an electrostatic protection unit and a mis-connect protection unit. The electrostatic protection unit is electrically connected to the interface circuit and the main circuit and is configured for clamping a voltage of a node to a predetermined value, which the node is defined by the interface circuit, the electrostatic protection unit, and the main circuit. The mis-connect protection unit is electrically connected between the node and the main circuit. When the interface circuit is incorrectly connected to the power supply, the mis-connect protection unit disconnects an electrical connection between the power supply and the main circuit.

The invention relates to a zero blind area anti-islanding protection system of low-voltage distributed power supply, include that box, inverse power protector, a protection module and an output controller, one end of the inverse power protector is connected with a first current transformer, the other end of the inverse power protector is connected with an output controller, one end of the protection module is connected with a second current transformer, the other end of the protection module is connected with an output controller, and the output controller is connected with a grid-connected switch of a low-voltage distributed power source; Advantages of the invention: detecting the current on the low-voltage side of the transformer by a first current transformer connected to the reverse power protector, As current reversal is detect, Through the output controller, the low-voltage distributed power supply can be forced to switch on and off immediately, thus ensuring that no arc island is formed in 100% of the low-voltage distributed power supply, ensuring that the distributed power supply will not return high-voltage power to the 10KV line through the transformer, ensuring the safety of the repair or maintenance personnel, and avoiding the occurrence of mass casualties.

An apparatus is provided which comprises: a protection circuitry coupled between: a node and a first circuitry that is to selectively output a first voltage, the node coupled to a second circuitry that is to selectively output a second voltage, the protection circuitry comprising: a pair of complementary parallel transistors coupled between the node and the first circuitry, the pair comprising first and second transistors, wherein a gate of the first transistor is to receive a control signal at the first voltage, and a third transistor to selectively couple a gate of the second transistor to the node, a gate of the third transistor to receive the control signal at the first voltage.

An energizing system for energizing an electric power transmission cable (60) is provided. The electric power transmission cable (60) has an input side (65) coupled to an electric power source (61) and an output side (66) coupled to a load (621). The energizing system includes a first switch (10) connected between the power source (61) and the input side (65) of the power transmission cable (60) to connect and disconnect the power source (61) from the power transmission cable (60). A reactive power compensation unit (50) is further provided for compensating reactive power generated by at least one of the power transmission cable (60) or the load (62). A second switch and a third switch are provided for connecting the reactive power compensation unit (50) in parallel to the first switch (10) or the load (62).

A protective circuit includes an input, an output, a p-type field-effect transistor whose drain terminal is connected to the input and whose source terminal is connected to the output, a capacitor between the gate terminal of the field-effect transistor and ground, a Zener diode whose cathode is connected to the output, a resistor between the anode of the Zener diode and ground, and a diode whose anode is connected to the anode of the Zener diode and whose cathode is connected to the gate terminal of the field-effect transistor.

The invention discloses an anti-sway electricity method and a device, which are applied to a power supply circuit of a high-voltage equipment. A method comprise that following step of: obtaining a zero-sequence current in a power supply loop of a high-voltage device; Judging whether the obtained zero-sequence current flows from the high-voltage equipment to the power supply; If so, the fault alarmcorresponding to the high-voltage equipment is issued or the power supply circuit of the high-voltage equipment is disconnected, so that the problem that the power shaking affects the normal operation of the electric equipment can be avoided.

The invention provides an anti-backflow current charger, which comprises an electric energy conversion circuit and a protection circuit, the protection circuit comprises a first switch, a second switch and a comparator, the first switch is connected in series with the output end of the electric energy conversion circuit, the input end of the comparator detects the current flowing through the first switch, and the output end of the comparator detects the current flowing through the second switch. The output end of the comparator is connected with the control end of the second switch, and when the current direction is reversed, the comparator controls the second switch to be switched on, the second switch enables the gate-source electrode of the first switch to be in short circuit, and the first switch is switched off. The anti-backflow current switching circuit provided by the invention can quickly respond, quickly turn off the switch at the output end of the charger, cut off the path of the backflow current flowing to the charger, and limit the magnitude of the backflow current within an acceptable range.

A circuit breaker that functions like a double pole double throw (DPDT) switch is used to isolate the commercial power grid from an external power source. When in the “on” position the circuit breaker serves as a main power input circuit breaker allowing power from the commercial power grid to feed into existing wiring. In the “off” position the commercial power grid is disconnected and isolated from the existing wiring. Instead, the switch mechanism is connected to an external power source such as a generator. The generator can be safely operated without risking power backfeed into the commercial power grid.