126 results about "GENERATOR MALFUNCTION" patented technology

The invention provides an alternating-current brushless generator fault detection method based on an exciter exciting current. The method comprises the following steps: firstly, measuring the direct-current component and each subharmonic amplitude value of the exciter exciting current of a generator set; and then, detecting whether the generator set generates electrical failures or not with a stator winding turn-to-turn short circuit diagnosis algorithm, a rotor winding turn-to-turn short circuit diagnosis algorithm, an exciter fault diagnosis algorithm and a rotary rectifier fault diagnosis algorithm, wherein the electrical failures comprise stator winding turn-to-turn short circuit, rotor winding turn-to-turn short circuit, exciter rotor winding turn-to-turn short circuit, exciter rotor winding interphase short circuit, open circuit of one diode of the rotary rectifier and short circuit of one diode of the rotary rectifier. According to the LabView development fault diagnosis algorithm, various electrical faults can be detected by measuring the exciter exciting current so as to save measurement points, and various invasive sensors do not need to be installed in the generator. The alternating-current brushless generator fault detection method has good instantaneity, and the on-line detection requirement can be satisfied.

A fault detection system is provided, and includes a generator, a power converter, a breaker, a current monitoring device, and a control module. The power converter is selectively connected to the generator and is selectively activated to produce a test voltage. The breaker is located between the generator and the power converter for selectively connecting the generator to the power converter. The breaker includes an open position and a closed position. The current monitoring device is located between the generator and the power converter. The current monitoring device measures a line current between the generator and the power converter. The control module is in communication with the current monitoring device and the power converter. The control module has a memory with a threshold current value.

A hybrid powertrain has an engine, an input member, an output member, and a stationary member, and includes a single planetary gear set having a first, a second, and a third member. The input member is connected for common rotation with the engine. The output member is connected for common rotation with the second member. A first and a second motor/generator are provided, as well as five torque-transmitting mechanisms, including only one brake. The torque-transmitting mechanisms are engagable in different combinations to establish at least two electric-only operating mode, at least two engine-only operating mode, and at least three electrically-variable operating modes. In one embodiment, an electric torque converter operating mode is provided, and may be the default mode in case of motor/generator failure.

A fault-tolerant control system and method for variable-speed variable-pitch wind turbines with an inverter-fed generator. When generator faults are detected, the generator torque and/or flux is limited to prevent propagation of the faults and possible failure and shutdown of the generator. The control system and method improves on two-loop control methods for variable-speed variable-pitch wind turbines and provides improved power delivery under fault conditions.

Fault analysis and detection involving a generator neutral ground includes monitoring a voltage waveform across a neutral grounding transformer of a generator. During monitoring of the voltage waveform a sample of the voltage waveform is acquired. Previously, a number of similar past samples of the monitored waveform were acquired and stored as well. The present sample is compared to one or more of these stored, past samples so that, based on a similarity between the present sample to the past samples, a generator fault indicated by the present sample can be identified. Identifying the generator fault can include recognizing that it is presently occurring or that it may occur in a predictable timeframe. Additionally, identifying a component of the generator that caused, or will cause, the generator fault can be identified as well. A diagnostic message or control signal based on the identified generator fault can then be generated.

The invention discloses a method for state monitoring and early fault warning of a stator core of a ship generator. The method comprises the steps of (1) establishing a ransient state temperature rise mathematic model based on temperature rise, a generator structure and operation parameters of the stator core of the ship generator; (2) acquiring data of the generator in operation and using the data as sample data when the working condition of the ship generator changes, and applying a least square method to perform parameter identification on the established transient state temperature rise mathematic model; and (3) comprehensively judging a generator state by means of dynamic judgment and static judgment methods and achieving early warning of generator faults. Parameters of the transient state temperature rise mathematic model in the method reflect a technical state of the generator, the system parameter change situation is obtained by identifying a core temperature model in real time and is comprehensively judged with a rated temperature rise difference, the generator state can be accurately judged, and the early fault warning of the stator core of the generator is achieved.

The invention provides a wind vane fault redundancy operation method and system of a wind turbine generator. The method comprises the steps of collecting the wind speed value output from an anemometerof the wind turbine generator, wherein the anemometer is a wind cup anemometer with three wind cups; determining the change rule of the wind speed value; and judging whether the wind direction changes on the basis of the change rule of the wind speed value so as to control the yaw operation of a wind turbine of the wind turbine generator when wind vanes of the wind turbine generator malfunction.According to the operation method provided by the invention, based on the change rule of the wind speed value output from the anemometer of the wind turbine generator, the wind turbine is subjected toyaw control so that the redundancy operation is achieved after the wind vanes of the wind turbine generator malfunction; the problem of inaccurate data that the redundancy operation of the wind turbine is based on is solved, and the normal operation of the wind turbine generator is ensured; and the cost is saved.

An electric vehicle is provided having an electric generator and a motor. Generated electrical energy may be routed to a DC bus of an inverter system. The inverter system may be configured to provide the electrical energy to the motor. A controller may detect a fault based on the voltage level of the DC bus.

The invention discloses an aircraft DC power supply system and a power supply method. The system comprises: at least two generators and correspondingly connected motor controllers for generating and outputting DC power to corresponding primary power bus bars; at least two primary power bus bars respectively connected to the at least two generators through controllable switches, wherein the two adjacent primary power bus bars are connected to each other; an external DC power source connected to the primary power bus bars through the controllable switches for supplying power to the primary powerbus bars in the engine starting state; DC power conversion devices, wherein the input ends are connected with the primary power bus bars, and the output ends are connected with key load bus bars forconverting the DC power on the primary power bus bars and outputting to the key load bus bars; and the key load bus bars for supplying power to corresponding key loads. The power density of the systemis improved and the continuous power supply of the power supply system when single or multiple generators are faulty is achieved.

A method and apparatus is disclosed for detecting one or more faults in a multi-phase alternator, wherein a phase sensing unit, comprising a star wound resistor assembly, senses each phase of the alternator and provides an indirect phase measure; further wherein a comparing unit, comprising an op amp, receives and compares each of the corresponding phase measures with a reference to provide a comparison result and wherein a fault detection unit receiving the comparison result and providing a fault condition signal in the case of a fault.

The invention discloses a generator fault detector in the technical field of fault detection. The generator fault detector comprises a SCM. The input end of the SCM is electrically connected with theinput end of a data comparison module and the input end of a wireless transceiver module. The output end of the wireless communication module is electrically connected the input end of a remote monitoring terminal. The output end of a relay is electrically connected to the input end of a power supply line. The output end of the power supply line is electrically connected to the input end of a generator. The generator fault detector can simultaneously detect the temperature information, the rotation speed information, the voltage information, the current information and the audio information ofthe power generator, processes and compares the detected information, can accurately determine the fault type and the fault information of the generator, realizes remote transmission of the fault information, can easily determine a fault position, achieves remote operation of the generator, facilitates the control and maintenance of the generator and improves the operation safety of the generator.

The invention discloses a load quick-cut control system which is based on a low-capacity power grid separated from a high-capacity power grid. If emergencies such as generator failure disconnection in an isolated power grid operation working condition happen, in order to achieve safe operation of a small power grid system, partial load in the small power grid needs to be cut off quickly, sampling data needs to be accurate, quick-cut speed is quick, failure machine stopping and load cutting are judged, underfrequency load shedding is carried out, after a generator is stopped caused by failure, in order to prevent the failure from further expanding, partial load is quickly cut off in 300 ms, and accordingly electricity generating and using of the power grid reach reasonable balance in a short time, electricity using load is adjusted and switched, basic operation of a factory under an abnormal condition is guaranteed, and requirements on isolated power grid operation are met.

The wind generator vibration monitoring and diagnosis device provided by the present invention can monitor and grasp the operating state of the wind generator in real time, and timely diagnose existing or upcoming faults according to the status information of the wind generator, which can improve the service life of the wind generator and reduce the wind power. The failure rate of the generator can reduce the loss caused by the downtime of the wind turbine. Simultaneously, adopting the wind power generator testing device provided by the present invention can not only realize the real-time monitoring and diagnosis of the wind power generator, but also realize the real-time monitoring and diagnosis of the wind power generator by simulating the different operating states of the wind power generator, so that the wind power generation The monitoring and diagnosis of the machine is more convenient and efficient.

The invention relates to the field of wind turbine generator fault early warning, and provides a wind turbine generator fault early warning method based on an SVR algorithm and kurtosis. The method comprises: carrying out data collection of historical data of a wind turbine generator; performing data cleaning to remove abnormal data; establishing an early warning model by using a support vector regression algorithm; carrying out residual analysis and early warning; and based on skewness and kurtosis in statistics, calculating the residual error of the output value of the early warning model; and calculating the kurtosis and skewness of the residual error day by day through a sliding window algorithm, taking a mean value of a maximum value of the skewness and a maximum value of the kurtosisas a maximum value of an early warning model threshold, taking a mean value of a minimum value of the skewness and a minimum value of the kurtosis as a minimum value of the early warning model threshold, and carrying out online monitoring and early warning on real-time data of the wind turbine generator. According to the method, pre-fault pre-judgment can be provided in time before the wind turbine generator breaks down, fault analysis and control are achieved in the first time, and huge economic losses and safety accidents are prevented from being brought.

The invention relates to the technical field of train motor overhauling processes, in particular to a novel traction generator overhauling process. An overhauling process includes the steps of appearance inspection, slip ring dismantling, motor disassembly, motor overhauling and motor assembly, wherein overhauling including slip ring overhauling, rotor insulation processing, rotor screw hole inserting and bushing, end cover crack repairing welding and auxiliary generator stator modification is respectively performed on all of parts after motor disassembly, and motor assembly, qualified insulation detection and section output are performed after all of parts are overhauled. The main and auxiliary generator overhauling process overcomes the problem that HXN5 main and auxiliary generators are complicated in structure, free of relevant experiences for reference and large in overhauling difficulty when being overhauled for the first time and is a special overhauling process for the HXN5 main and auxiliary generators, the blank of an HXN5 main and auxiliary generator overhauling process is filled by improving and innovating main and auxiliary generator overhauling processes, the main and auxiliary generator faults can be repaired, hidden danger can be eliminated, and the motor overhauling level can be improved.

A engine driven electrical generating system and its support cradle for use in confined space enclosures with a triple redundant troubleshooting system, a triple redundant troubleshooting data transmission system, and a double redundant electric fan cooling system wherein the most common modes of motor or generator failure can be repaired quickly and easily with the genset in situ. With the most common mode of failure for a genset being overheating, enhanced fan monitoring and replacement systems have been incorporated.

The invention discloses a rotating rectifier and exciter circuit fault dual-function and dual-redundancy monitoring circuit. Signals of the monitoring circuit are sampled from a sampling resistor in an alternating-current exciter excitation circuit, the signals sampled from the sampling resistor are divided into two paths, one path of signals are used for detecting the harmonic content in the signals, and the other path of signals are used for detecting the exciting current. The rotating rectifier and exciter circuit fault dual-function and dual-redundancy monitoring circuit has the advantages that the monitoring circuit can monitor faults of a rotating rectifier in two ways, the online monitoring of the faults of the rotating rectifier is achieved, the reliability of fault detection is improved, and the cost is reduced; the circuit can also monitor the abnormal increase of the exciting current, the monitoring circuit has the advantage of achieving the two-kind fault monitoring function, the generator fault monitoring technology is greatly simplified, and reliability and practicability of fault monitoring are improved.