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231 results about "Action status" patented technology

Relay protection method capable of quickly removing dead zone fault of transformer

The invention relates to a relay protection method capable of quickly removing dead zone fault of a transformer. The relay protection method includes: during trip control of dead zone fault of one side of the transformer, setting conditions including a first condition and a second condition; if all the conditions are met, disconnecting a differential TA on the side of the transformer after delaying by a constant value, namely preventing current of the side of the transformer participating differential protection current calculation; if no conditions are met, then connecting the differential TA on the side of the transformer immediately, namely allowing current of the side of the transformer to involve in differential protection current calculation of the transformer. The first condition is that a spare strip protection outlet relay of the same of the transformer is in an acting stator or other electrical capacity protection (such as bus differential protection) strip outlet relay is in an acting state; the second condition is that the current of phase A, the current of phase B or the current of phase C of the side of the transformer reaches a setting value or zero-sequence current or negative-sequence current is larger than or equal to the setting value. The relay protection method has simple action principle, is high in reliability, and capable of removing dead zone faults of different sides and different voltage classes of the transformer quickly.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO +2

Power grid fault diagnosis method based on temporal Bayesian knowledge base (TBKB)

The invention discloses a power grid fault diagnosis method based on temporal Bayesian knowledge base (TBKB). The power grid fault diagnosis method comprises steps of establishing a corresponding temporal Bayesian knowledge base (TBKB) diagnosis model; clearly describing work principles and processes of relevant protectors and circuit breakers after elements are broken down; establishing a temporal causal relationship (TCR) among different action events; quantificationally expressing a successive restraint relationship among different action status nodes in the aspect of timing sequence; and identifying conditions of action events, time mark errors and the like of the abnormal protectors and the abnormal circuit breaks. Uncertain states of nodes and information loss nodes which do not pass TCR examination in alarm information are supposed and combined, so that a supposed state combination gather is formed, the fault probability of every supposed state combination is obtained, the fault probability of suspected fault elements is obtained, and fault elements are diagnosed. The protectors and the circuit breakers which operate mistakenly and fail to operate and the time mark error condition of the protectors and the circuit breakers are detected by forward reasoning of the TBKB modal to the fault elements. The total power grid diagnosis method is fast and accurate and is high in fault tolerance.
Owner:SOUTHWEST JIAOTONG UNIV

VR cardiac surgery simulation system and simulation method thereof

The invention discloses a VR cardiac surgery simulation system. The system comprises a simulation server, a surgical operation device, a medication operation device, a virtual database and a live-action data generation unit. The virtual database is connected with a communication interface. An operation data acquisition device and an operation data communication module are sequentially connected between the surgery operation device and the live-action data generation unit. A medication flow acquisition device and a medication flow communication module are sequentially connected between the medication operation device and the live-action data generation unit. The invention further discloses a VR cardiac surgery simulation method. According to the invention, the collected data of a myocardialpressure detection module and the action state data of the surgical operation device are responded by the medication operation model, the surgical operation model and heart simulation data which arestored in a virtual database. In this way, a virtual-real hybrid simulation scene is obtained, so that the technical effect of combining actual operation and the virtual scene is achieved. The preoperative scheme design is facilitated. The growth of surgeons in practice is facilitated, and the use effect is good.
Owner:王寅

Method for detecting mechanical characteristics of circuit breaker

InactiveCN104391245AFill in the detection gapJudgment based on simpleMachine part testingCircuit interrupters testingElectrical resistance and conductanceAction status
The invention relates to a method for detecting mechanical characteristics of a circuit breaker. A control circuit of the circuit breaker supplies power by the aid of direct-current constant voltage, switching-closing coil current of the control circuit of the circuit breaker is detected, the action state of a switching-closing electromagnet is analyzed, and the mechanical characteristics of the circuit breaker are finally judged. The corresponding relation between voltage and current of the switching-closing electromagnet is expressed by a formula shown in an instruction, U refers to coil power supply voltage, R refers to coil resistance, L refers to coil equivalent inductance, the influence of the speed of an iron core on the current is further expressed by converting the formula, delta refers to an electromagnet air gap, and v refers to the change speed of the air gap, namely, the movement speed of the iron core. Compared with the prior art, the circuit breaker can be detected, all operation mechanisms of the circuit breaker are springs, the method can detect C-GIS switch incapable of being detected by traditional detection technology, maintenance labor and cost are saved, and on-site labor productivity is improved.
Owner:STATE GRID CORP OF CHINA +2
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