78results about How to "Criterion is simple" patented technology

A monitoring system including a video viewer sited to view an area of interest characterized by its proximity to, and/or location with respect to, at least one visual stimulus, a generator of electrical signals representing video images of the area at different times, processor for processing the signals to determine a behavior pattern of people traversing said area and a response indicator utilizing the behavior pattern to provide an indication of a response by said people to said visual stimulus.

A system for automatically classifying and counting people, such as supermarket customers, and associated objects such as shopping trolleys. One or more video cameras view an area traversed by the customers and the video data is processed, in real time, to allocate each customer to one or more of a set of predetermined categories in dependence upon recognition criteria developed to permit reliable classification of customers in relation to the various categories.

The high-voltage series compensation capacitor group unbalance protection device is related to the relay protection of high-voltage transmission lines, and solves the problems of few functions and low sensitivity of the existing protection devices. Including the A/D conversion module, which converts the current generated by the capacitor bank current transformer D and the unbalanced current transformer E into digital quantities, and the data judgment and calculation module, which converts the current Ic of the capacitor bank, the unbalanced current ΔI, and the current of the capacitor bank A Threshold current Imk, capacitive reactance change rate Kx of the original H-arm capacitive reactance, reliability factor Kk to calculate the number of faulty capacitor units, storage module, storage threshold current Imk, capacitive reactance change rate Kx, reliability factor Kk, faulty The number of times and calculation results are used to protect the output module, and the judgment result of the calculation module is judged according to the data to alarm or trip protection.

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.

A judgment method of line breakage of a special TV for inter-turn protection of a generator comprises the following steps: a generator terminal is provided with a general voltage transformer TV1 and aspecial voltage transformer TV2 for inter-turn protection; a protection device is used for sampling secondary side voltages of the voltage transformers, thus respectively obtaining negative sequencevoltage 3U2 of the TV1, negative sequence voltage 3U2' and foundational wave zero sequence voltage 3U0' of the TV2 based on holocycle Fourier filtering and calculation; and fixed values U2.set1, U2.set2 and U0.set2 are preset inside the protection device, wherein, 3U2 is smaller than U2.set1(1), 3U2' is greater than U2.set2 (2) and 3U0' is greater than U0.set2 (3). When meeting inequations (1)-(3)simultaneously, a line breakage alarm signal of the TV2 is generated after short delay t1, and the inter-turn protection is locked; and if the TV2 has no line breakage later, that is, that is, the inequations (1)-(3) can not be met simultaneously, line breakage alarm of the TV2 is canceled after long delay t2, and longitudinal fundamental wave zero voltage inter-turn protection is re-started.

The invention discloses a method for judging the breakage of a voltage transformer circuit; the secondary side three-phase voltage and the open triangular zero sequence voltage of a generator terminal voltage transformer TV are measured, and the tertiary harmonic voltage UA3, UB3 and UC3, and the tertiary harmonic component 3U03 of the open triangular zero sequence voltage are calculated; the value of the secondary phase voltage side is return counted to be U'03 according to the voltage transformation ratio of the voltage transformer TV on the 3U03: Umax=max{UA3, UB3, UC3, U'03}, Umin=min{UA3, UB3, UC3, U'03}; and when the Umax >=K.Uset0 and Umax>=K.Umin are met simultaneously, the breakage of the TV circuit is judged, wherein K is the fixed slope value, Uset0 is the inflection point fixed voltage value, and the two are constants. The method can accurately judge if the TV circuit is broken, and because the voltage measured of the TV is only used, the voltage of other TVs or the current of a TA do not need to be measured, and the criterion is simple and is easy to realize.

Techniques are disclosed for determining characteristic feature(s) of a vehicle travelling on a roadway, comprising: a detector, which is directed towards the roadway and is configured to measure the movement vector of the vehicle at a current location and time, a tracking unit, connected to the detector, for calculating a target location of the vehicle at a target time on the basis of current location and time and movement vector, a first radar sensor, connected to the detector, for transmitting a radar beam directed towards the current location, receiving a reflected radar beam, and determining a frequency spectrum thereof, a second radar sensor, connected to the tracking unit, for transmitting a radar beam directed towards the target location at the target time, receiving a reflected radar beam and determining a frequency spectrum thereof, and an evaluation unit for generating characteristic feature(s) of the vehicle from the determined frequency spectra.

The invention discloses a backup protection method and device for a high-voltage direct current transmission line. The method comprises the following steps: collecting current information of a relay protection device installed on both sides of the high-voltage direct current transmission line; filtering the sampled current information by a low-pass filter to obtain a filtered current sampling value; and filtering the sampled current information by a low-pass filter. Using the filtered current value, the differential current of the positive and negative DC lines after filtering can be calculated. By comparing the difference current of the positive and negative DC lines after filtering with the minimum action current, the faults inside and outside the DC line can be determined. If the faultis located in the DC line protection area, the fault of the positive line, the negative line or the bipolar line can be determined by comparing the difference between the positive and negative filtered current values. The invention has the beneficial effects of simple criterion, fast operation speed and high reliability, and can respond to the high-resistance grounding fault of the DC line, and can solve the problem that the action speed of the backup protection of the DC line is too slow.

A method for differentiating between ultrasonically tuned blades which are broken or cracked, and blades which are gunked by evaluating measured impedance differences when a system is first excited with a low displacement signal and then with a high displacement signal. The method is performed irrespective of the age of the hand piece/blade, the temperature or specific type of hand piece or blade, and is not affected by self healing effects of slightly cracked blades. Moreover, the method facilitates the quantifiable determination of the amount of gunk on the blade. Absolute impedance measurements of the transducer or blade are unnecessary. Instead, only relative impedance measurements are required, which greatly simplifies the measuring criteria. This provides a way to measure the amount of gunk accumulation, and thereby a way to calculate/estimate the amount of heat generated at the sheath, as well as a way to calculate/estimate the amounts of degradation to the load curve of the ultrasonic system.

The invention belongs to the technical field of relay protection, and relates to a sequence component longitudinal direction protection method of a six-phase power transmission line. The method comprises the following steps of: collecting six-phase current and voltage data through protecting a current transformer and a voltage transformer at the mounting part; respectively converting into six sequence voltage components and six sequence current components; calculating a reverse sequence fault component and a positive sequence fault component; determining movement criteria of T1, F0 and F1 fault components, and if more than one of the three criteria is determined to be a positive direction fault, protecting the generation of the determined positive direction short circuit of the side; protecting a determined reverse direction generation circuit of the side, if the three criteria are all of reverse directions; protecting tripping operation of movements if the side and the opposite side are both determined to be the positive direction short circuit; and protecting failure to actuate if one side of the two sides are determined to be the reverse direction short circuit or two sides are both determined to be reverse direction short circuits. According to the invention, the criteria are simple, the protection method is easy to realize and can reflect all faults of a six-phase system, and the method is an ideal main protection scheme.

The invention relates to a direct current line fault recognition method based on the polar line current gradient sum, and belongs to the technical field of electric power system relay protection. After a high voltage direct current line has a metallic grounding fault, a latter current value of an adjacent sampling point measured by a measuring terminal is employed to subtract a former current value, and the ratio of the difference of the current values to a sampling interval is defined as the current gradient. The fixed length before the current sampling point is selected as the time window length, the sum of the current gradients of all the sampling intervals is calculated, and an obtained value is defined as the current gradient sum of the current sampling point. When the current gradient sum of five continuous sampling points of the measuring terminal is greater than a setting value, it is determined that inner faults of the line occur; and when the current gradient sum of the five continuous sampling points is smaller than the setting value, it is determined that external faults of the line occur. It is indicated that the method is reliable and the precision is high for fault type discrimination via a lot of simulation.

The invention relates to a transformer dead-zone fault relay protection method based on rapid removal and sealed TAs. According to the method, in trip control of certain-side dead-zone faults of a transformer, three conditions are set, wherein as for the first condition, a certain-side backup protection trip outlet relay of the transformer is in an action state, and alternatively other electrical quality trip outlet relays are in action states; as for the second condition, when the first condition is met, single-pulse open protection is started for time T; as for the third condition, a certain-side A-phase or B-phase or C-phase current of the transformer reaches a starting value, and alternatively a zero-sequence current Io or a negative-sequence current I2 reaches the starting value; when the conditions are met, the certain-side transformer differential protection TA of the transformer is quitted after time delay; when any one condition is not met and alternatively after open protection lasts for the time T, the certain-side transformer differential TA of the transformer is accessed by 0s. According to the transformer dead-zone fault relay protection method, action principles are simple, reliability is high, and various voltage class dead-zone faults on all sides of the transformer can be removed rapidly.

The invention relates to the field of power systems, in particular to a single-end diagnosis method for an ultra-high-voltage direct current transmission line breakdown based on transient monitoring.The single-end diagnosis method comprises the following steps that a voltage and a current at the line measurement point are obtained in real time, and a voltage frequency band transient component anda current frequency band transient component are obtained through filtering; a transient impedance change value and the transient power are calculated; when the transient impedance change value is less than a threshold value, a forward breakdown is judged; when the transient impedance change value is greater than the threshold value, a reverse breakdown or no-breakdown is judged; when the forwardbreakdown is diagnosed, if the transient power is greater than a threshold value, the direct current transmission line breakdown is judged; and if the transient power is less than the threshold value, a forward region external breakdown is judged. Through the single-end diagnosis method, the following effects that the transient impedance change value and the transient power are matched, the single-end diagnosis method is high in reliability, simple in criterion and convenient to calculate for diagnosing the direct current transmission line breakdown, and the breakdown type of the ultra-high-voltage direct current transmission line can be distinguished accurately and reliably can be achieved.

The invention relates to a relay protection method for dead-zone faults of voltage transformers on the basis of starting at switching positions and sealed current transformers TA. The relay protection method includes setting four conditions during tripping control for the dead-zone faults on certain sides of the voltage transformers; enabling the differential protection current transformers TA on the certain sides of the voltage transformers to withdraw after time delay elapses if the conditions are met; accessing the transformer differential protection current transformers TA on the sides of the voltage transformers after the time of 0s elapses if an optional condition is not met. The first condition includes that local-side backup protection current elements for removing side circuit breakers of the voltage transformers are started; the second condition includes that the side circuit breakers of the voltage transformers are located at opening positions; the third condition includes that primary pulse T-time opening protection is started if the first condition and the second condition are met; the fourth condition includes that A-phase or B-phase or C-phase currents of the certain sides of the voltage transformers reach starting values or zero-sequence currents Io or negative-sequence currents I2 reach starting values. The relay protection method has the advantages of simple action principle, high reliability and capability of quickly removing the various voltage grades of dead-zone faults of various sides of the voltage transformers.

The invention discloses a variance-based zero-sequence over-current inter-turn protection method for graded controllable reactors. The method comprises the steps of (1) calculating a variance delta U0 between the zero-sequence voltage of the current cycle of a reactor head end and the zero-sequence voltage of the previous cycle thereof; (2) calculating the variance delta I0 between the zero-sequence current of the current cycle of a control winding side and the zero-sequence current of the previous cycle thereof; (3) on the condition that the variance delta I0 of the zero-sequence current is larger than a zero-sequence over-current threshold delta Iset and the variance delta U0 of the zero-sequence voltage is smaller than a zero-sequence voltage blocking threshold delta Uset, concluding the occurrence of an in-region grounding fault or an inter-turn fault and realizing the inter-turn protection. According to the technical scheme of the invention, on the basis of the zero-sequence current variance on the same control winding side, the amplitude of the line-side zero-sequence voltage variance is compared to judge the inter-turn fault of a reactor load on the control winding side of the reactor. In this way, during the occurrence of an inter-turn fault on the control winding side of a graded controllable high-voltage shunt reactor, the reactor is prevented from being affected by the influence of the incomplete-phase operation and other operating states based on the zero-sequence over-current protection means. Meanwhile, the method is simple and concise in criterion, sensitive in protection and high in reliability.

The invention discloses a circuit breaker failure protection relay protection method for a 220kV inner bridge wiring transformer substation. The method is suitable for a transformer substation in a 220kV inner bridge wiring mode and comprises the following steps of: 1, a control process of failure of a breaker 1DL1 of a 220kV line L1; 2, a control process of failure of a breaker 2DL of 220kV line L2; and 3, a control process of failure of a 220kV inner bridge circuit breaker. After the failure of the circuit breaker or the inner bridge circuit breaker of the 220kV transformer is judged, the adjacent circuit breaker of the failure circuit breaker is tripped off after time delay, the criterion is simple and practical, and the relay protection function of the failure of the 220kV inner bridge circuit breaker is realized. When the 220kV line circuit breaker on the side fails, the circuit breaker on the opposite side is remotely tripped through the remote tripping function of 220kV line optical fiber current differential protection, new equipment does not need to be added, and the method is good in economical efficiency and high in realizability.

The invention relates to a fan wind alignment optimization method and system based on vibration and an inclination angle. The optimization method comprises the following steps that S1, an inclination sensor is used to monitor the inclination angle theta of the projection of a deflecting fan tower cylinder in the x-axis or y-axis direction when the wind speed is stable, so as to judge the wind direction; S2, a vibration sensor is adopted to monitor components of the projection of the vibration amplitude of the fan tower cylinder in the x-axis direction and the y-axis direction when the wind speed is unstable, and therefore the wind direction can be obtained according to vector synthesis; and S3, the recognized wind direction data are fed back to a fan yaw system, the fan yaw system makes a judgment, the blade position is adjusted, and fan wind alignment optimization is achieved. The optimization system comprises a data acquisition module, a wireless transmission module and a communication module. The optimization system further comprises a sensor group, and the sensor group comprises the inclination sensor and the vibration sensor. According to the method and the system, the wind direction is identified and calibrated by using the vibration and inclination angle generated in the operation process of the fan tower cylinder, and the method and the system have the characteristics of low cost, high performance, high reliability and the like.

A system and method for efficiently querying a network of logical digital advertising units by creating a list of named criteria meaningful for the particular network and then associate relevant criteria with each unit. A simplified query system is disclosed having two selection lists, one for choosing criteria of interest and the other for choosing an appropriate boolean operator, which allows sophisticated queries to be submitted with a few clicks of the mouse if the network is set up as disclosed herein.

The invention belongs to the field of power system relay protection, and particularly relates to a direct-current transmission line pilot protection method and application thereof, and the method comprises the steps: collecting and filtering voltage and current, and calculating the comprehensive admittance of a single-pole line if the single-pole line is the single-pole line; if the line is a bipolar line, calculating differential current of a positive line and a negative line and an integral value of the differential current in a current time window for fault pole selection, and calculating voltage common modulus and voltage differential modulus of a rectification side and an inversion side to calculate common-mode comprehensive admittance and differential-mode comprehensive admittance; fault area judgment is carried out by using a criterion based on unipolar line comprehensive admittance; or, if the pole selection result is single-pole grounding, the criterion based on common-mode comprehensive admittance is adopted for fault area judgment, and if the pole selection result is inter-pole short circuit, the criterion based on differential-mode comprehensive admittance is adopted for fault area judgment. According to the method, the criterion is simple, the transition resistance resistance is high, no line parameter is needed, and compared with a traditional current differential protection non-locking process, the action speed of line backup protection can be effectively improved.