108 results about "Bypass operation" patented technology

Systems and methods of controlling an uninterruptible power supply are provided. The uninterruptible power supply includes an input to receive input power, and an output to provide power to a load. The uninterruptible power supply also includes an inverter, a bypass switch, and a controller. The inverter is coupled with the input and with the output, and the bypass switch can provide the input power at the output in a bypass mode of operation. The controller is coupled with the inverter and the bypass switch. The controller can activate the bypass switch in a first configuration to provide the input power at the output during a first half of a cycle of an input voltage waveform, and can activate the bypass switch in a second configuration to provide the input power at the output during a second half of the cycle. With the inverter active during bypass operation, the inverter can more quickly provide output power upon the loss of bypass power, and can provide near unity power factor correction and harmonic distortion correction.

The present invention relates to Voltage balancing control method for modular multilevel converter is characterized that, it includes some steps as follows:

1) Determine the leg current direction is positive or negative;

2) Find out the highest sub module on output state whose capacitor voltage amplitude is the maximum, and find out that on bypass state whose capacitor voltage amplitude is the minimum;

3) Determine whether the sub module inputs or bypass operation; this method avoided switching arbitrariness of the sub module, and decreased the switching frequency of the sub module. The capacitor voltage balancing control of the sub module proposed by the method is more suitable to be applied in the field of high voltage and large capacity converter that has large numbers of sub modules.

In a heat pump apparatus, switching between high efficiency operation, being efficient, and high capacity operation, having high capacity, is performed according to the state of the load. There are provided a main refrigerant circuit that uses an ejector, a first sub-refrigerant circuit that connects a portion between a heat exchanger and an ejector to a portion between a gas-liquid separator and a heat exchanger, and a second sub-refrigerant circuit that connects a portion between the heat exchanger and the ejector to an injection pipe of a compressor. When the load is about medium, refrigerant is circulated in the main refrigerant circuit to perform an efficient ejector aided operation utilizing the ejector. When the load is large, a high capacity injection operation is performed by flowing refrigerant to the second sub-refrigerant circuit. When the load is small, a simple bypass operation which prevents degradation of efficiency is performed by flowing refrigerant to the first sub-refrigerant circuit.

A redundant power distribution system and a method of providing redundant isolation are described. The system includes a normal operation circuit branch and an external bypass circuit branch, enhanced with a generator bypass connection, both connected to a critical load, the generator bypass circuit branch including a diverse, redundant power source. The normal operation circuit branch delivers power to the critical load during normal operations and the external bypass circuit branch delivers power to the critical load from the redundant power source via the enhanced generator bypass connection during bypass operations. The system also allows the critical load to be electrically isolated from all of or a portion of the normal operation circuit branch.

The invention provides a method and device for realizing software bypass in a firewall. The method comprises a step of judging whether a current network traffic flow is larger than or equal to a preset flow threshold, a step of calling a pre-packaged software bypass operation interface in a message receiving end function or an important safety service processing function if the current network traffic flow is larger than or equal to a preset flow threshold such that the software bypass operation interface obtains a current CPU use rate and a current network port receiving rate through calling a pre-packaged calculation interface and the software bypass is carried out between preset paired software bypass network ports according to a preset rule when the current CPU use rate and the current network port receiving rate are larger than a current hardware equipment platform safety service processing packet loss threshold value. According to the method and the device, the problem of network jam or disconnection caused by equipment packet loss when current network flow is large or the sudden traffic of a peak time appears and the current network flow reaches the maximum performance upper limit of the safety service processing of a firewall in the prior art is solved.

A multiplexer circuit of a late-write type semiconductor memory device for selectively outputting data to be bypassed to a data output buffer is constructed with at least one or more data channels. Each data channel includes a first switch for transmitting the data in response to a first state of a bypass control signal, a latch part for latching the data output through a first switch, and a second switch for transmitting the data output from the latch part in response to a second state of the bypass control signal. Thus the circuit prevents data errors and improves time interval of cycles in bypass operation at high speed.

A transport refrigeration system, the transport refrigeration system including a container defining an enclosed volume and a refrigeration module coupled to the container. The refrigeration module is disposed to regulate the temperature of the enclosed volume and includes a compressor having a discharge port and a suction port, a condenser heat exchanger unit operatively coupled to the discharge port, an evaporator heat exchanger unit operatively coupled to the suction port, a condenser fan disposed proximate to the condenser heat exchanger unit, an evaporator fan disposed proximate to the evaporator heat exchanger unit; and a suction modulation valve coupled to the suction port. The transport refrigeration system further includes a bypass module coupled to the refrigeration module. The bypass module includes: a bypass mode switch having a normal operation position and bypass operation position; and an operational mode switch having a full cool position and fan only position. The transport refrigeration system also includes an electronic controller coupled to the bypass module. When the bypass mode switch is in the normal operation position the electronic controller regulates the operation of the refrigeration module. When the bypass mode switch is in the bypass operation position, the compressor, the condenser fan, the evaporator fan and the suction modulation valve are selectively operated by the position of the operational mode switch.

The invention provides a digital signal processor based on a parallel data channel. The parallel data channel sequentially comprises a parallel multiplication unit, a parallel operation unit set and a parallel accumulating unit, wherein the parallel multiplication unit comprises a plurality of parallel multiplying units and has the capabilities of carrying out multiplex real multiplication or complex multiplication as well as implementing bypass operation; the parallel operation unit set comprises a plurality of arithmetic logic units, and is formed by connecting multiple stages of arithmetic logic channels and a switching network composed by the plurality of arithmetic logic units in each layer, wherein each stage of arithmetic logic channel performs the parallel arithmetic logic operation through the plurality of parallel arithmetic logic units, and the operating result of the previous stage of arithmetic logic channel can be transmitted to the next stage of arithmetic logic channel through the switching network; each arithmetic logic unit is used for performing addition, subtraction, comparison, displacement, or absolute value operation; the bypass operation can be carried out to the layer; and the parallel accumulating unit is formed by a plurality of parallel accumulating units and is used for performing accumulating and post-processing. The digital signal processor based on the parallel data channel improves the processing performance and efficiency of the digital signal processor.

The invention discloses a bypass operation vehicle capable of enabling users to change a distribution transformer without power cutting. The bypass operation vehicle comprises a chassis, a low tension fast connector, a high tension fast input connector and a high tension fast output connector. A low tension switch cubicle, a high tension switch cubicle and a transformer are arranged on the chassis, the low tension fast connector is connected with the low tension switch cubicle through a first low tension cable, the low tension switch cubicle is connected with the transformer through a second low tension cable, the transformer is connected with the high tension switch cubicle through a first high tension flexible cable, and the high tension switch cubicle is respectively connected with the high tension fast input connector and the high tension fast output connector through a second high tension flexible cable and a third high tension flexible cable. A transportation frame is added, the bypass operation vehicle can be conveniently and flexibly scheduled, cross-region first-aid repair work can be achieved, and the bypass operation vehicle has strong adaptability and high application capability.

Provided is an intelligent electronic device for protection, monitoring, controlling, metering or automation of electrical power system. The system, method and device of the present invention preserves current differential protection active during a breaker bypass or similar operation. A current differential protection system is coordinated by one relay (transfer), which simultaneously establishes and handles multiple two-terminal 87L protection zones with several relays. This “enhanced multiple-terminal system” requires no change to protection settings on any local or remote relays during a bypass process.

Provided is a dual port Ethernet communication device which allows data received via any one communication port to be bypassed to other communication port. Since the Ethernet communication device performs such bypass operation itself, the communication data can be kept transferred to other terminal unit even though the terminal unit equipped with the Ethernet communication device does not operate normally due to causes such as a break down. In particular, if it is used in each terminal unit forming a closed loop in a closed loop power system, the communication on the closed loop remains such that the adjacent terminal unit can perform backup interrupt function even though a failure happens in a specific terminal unit forming the closed loop.

The disclosure relates to a method for operating a gas turbine plant which is supplied with a fuel gas via a compressor station. The compressor station includes a compressor which compresses the fuel gas which is fed via a gas feed line and delivers it via at least one control valve to a combustion chamber of the gas turbine plant. A bypass system is arranged in parallel to the compressor via which fuel gas can be directed in a switchable manner past the compressor to the at least one control valve. An energy-saving operation can be achieved in a simple manner by continuously measuring the fuel gas pressure at the outlet of the at least one control valve. A minimum fuel gas pressure, which is desired (e.g., necessary) for operation of the gas turbine, at the inlet of the at least one control valve is determined from the measured pressure values in each case. The compressor station can be switched over to bypass operation when the fuel gas pressure which reaches the inlet of the at least one control valve via the bypass system is greater than or equal to the minimum fuel gas pressure.

The invention relates to a bypass valve capable of repeating switch, including a valve body and a valve core capable of sliding in the valve body. The valve body is formed through a valve core to form an axial through main flow passage, where the valve body is provided with a bypass passage and an inner ring groove in the axial direction of the valve body. The bypass passage is formed when the bypass passage is communicated with the main flow passage through the connection passage, and the through flow passage is formed when the inner ring groove is communicated with the main flow passage through the connection passage. The valve body is also provided with a reset mechanism which is connected to the valve body and that positions the valve body at the time of opening the bypass flow passage and through the flow passage. The bypass valve can greatly improve the stability of the bypass operation and the straight-through operation, and realize the cycle switching between the multi-pass operation and the straight-through operation. It also has the advantages of fast plugging and high sand removal efficiency, and can greatly improve the drilling efficiency.

An embodiment of the invention provides a determining method and device of a bypass pressure setting value. The method includes: according to a real-time process variable of a bypass control system, predicting variance trend and rate of main steam pressure of a bypass control system and variance trend and rate of main steam temperature by a prediction algorithm of a state observer; according to the predicted variance trend and rate of the main steam pressure, the predicted variance trend and rate of the main steam temperature, actual operation condition of the bypass control system and bypass operation characteristics, calculating a given function of the bypass pressure setting value; entering the predicted variance trend and rate of the main steam pressure and the predicted variance trend and rate of the main steam temperature into the given function of the bypass pressure setting value, and calculating the bypass pressure setting value. The determining method and device has the advantages that precision of the bypass pressure setting value is improved and the actual condition of a random set of the bypass pressure setting values can also be improved so as to allow adapting.

The invention relates to a cable rack for power distribution network bypass operation, comprising a frame-type support body which is welded from a profile steel; the frame-type support body is sleeved with a plurality of cable reels wound with bypass cables through shaft tubes and bearing seats; every layer on the two opposite sides of the frame-type support body is connected with two matched cross rails along an upper layer and a lower layer; the bearing seat sets for arranging the shaft tubes are arranged on the cross rails, wherein the upper two cross rails are at least provided with a pair of bearing seat sets, and the lower two cross rails are at least provided with two pairs of bearing seat sets; and the cable rack for power distribution network bypass operation has the characteristics that: the structure is simple, the use is convenient, the bypass cables can be unfolded and folded, the cable rack can be matched with an auxiliary traction tool to improve the operation efficiency and the like.

The invention relates to a method and device for overpressure bypass test of flexible and direct converter valves, and the method comprises the following steps of firstly determining sub-modules to betested in a first valve assembly and a second valve assembly; charging a first auxiliary valve, a second auxiliary valve, a first test valve and a second test valve by using a charging branch; performing boost bypass operation on the sub-modules to be tested in the test valve by controlling the two test valves and the two auxiliary valves to trigger the over-voltage protection logic of the sub-modules after the voltage of the sub-modules to be tested rises to an over-voltage protection setting value, and controlling the sub-modules to be tested at the bypass to make the voltage of the sub-modules to be tested gradually decrease; and when the system current rapidly increases, triggering the over-current protection logic, and controlling all sub-modules to be blocked to make the current gradually decrease. The method is used to detect the stress characteristics of key components of the sub-modules under fault overvoltage and over-current and the correctness of the sub-module protectionlogic.

An enhanced bypass mode simulcast radio communication system (200) includes a plurality of transmit/receive (T/R) sites (210₁, 210₂, 210₃) configured to participate in a simulcasting communication session responsive to a control point system (201). A site controller (211) is responsive to determination of a timing malfunction at a first one of the T/R sites. In response, the site controller is configured to automatically terminate participation of the malfunctioning T/R site in the simulcasting communication session and perform further actions to cause the malfunctioning site to transition to a multisite mode of operation involving a network switching center (202). The simulcast system automatically adjusts its site timing to compensate for the loss of the T/R site in bypass.