54 results about "Thermal rating" patented technology

A method for modeling of an overhead electrical conductor, includes: collecting 3-dimensional location data of the conductor; substantially simultaneous with said collecting, acquiring a thermal measurement of the conductor with a local thermal sensor; and generating a CAD model of the conductor using the collected 3-dimensional location data of the conductor and the thermal measurement of the conductor. The CAD model facilitates thermal line analysis of the conductor, thermal rating of a power line that includes the conductor, clearance analysis relative to the conductor, and vegetation management relative to the conductor. Apparatus for determining temperature of the overhead electrical conductor, includes: a local thermal sensor that acquires thermal measurements of the conductor; and a data processor that extracts thermal readings from the thermal measurement, and processes the thermal readings and remotely collected 3-dimensional location data of the conductor to determine the temperature of the conductor.

Method for measuring the power line thermal rating or maximum allowable current rating of an overhead power line with respect to a suspended / anchored cable span (2), comprising at least the following steps of:monitoring a motion of at least one point P of said suspended / anchored cable span (2) over a time interval;monitoring actual line current I, in A, over said time interval;determining an actual sag of said suspended / anchored cable, as a variable of actual line current;measuring or determining the effective wind speed of said suspended / anchored cable span (2) over said time interval;determining a sag reserve DF, in m, for thermal rating, which is the distance between the actual sag and a maximum allowable sag;determining the rate of change, tan(α), in m / A2, of the actual sag versus the square of the line current for the effective wind speed; anddetermining the power line thermal rating of the overhead power line, or ampacity, linked to a corresponding safety clearance, at measured or determined effective wind speed, by adding the square of actual current I to the ratio of the sag reserve DF by the sag rate of change, tan(α), at the effective wind speed, and taking the square root of that addition, i.e.Ampacity=I2+DFtan(α),wherein ampacity is in amperes.

Provided is: an incorporated device incorporating an electrolytic bath and a power control device capable of minimizing any increase in temperature of the electrolytic bath and inhibiting a decrease in electrode lifespan; and a method for controlling the incorporated device. The incorporated device incorporates an electrolytic bath and a power control device capable of minimizing any increase in temperature of the electrolytic bath and inhibiting a decrease in electrode lifespan. The power control device is provided with: a voltage current control circuit for feeding, in a constant current control mode, an electrolytic current to the electrolytic bath while performing a control so that the electrolytic current does not exceed the current value of a reference current set in advance in accordance with the rated current of a unit cell constituting the electrolytic bath; and a temperature detection unit for detecting a temperature of the interior of the incorporated device and the environmental temperature on the outside of the electrolytic bath. When the temperature detected by the temperature detection unit moves out of a preset rated temperature range, the voltage current control circuit stops the feeding of the electrolytic current, and when the temperature detected by the temperature detection unit again falls within the rated temperature range, the voltage current control circuit restarts the feeding of the electrolytic current.

The invention discloses a control method for an air heater and belongs to the technical field of fan equipment. The method adopts an air heater control system and comprises the following steps of pressing down a switch to enable an electric heating tube to heat, delaying a time relay for 15 minutes and then connecting; meanwhile, sensing a real-time temperature signal in a hot air chamber and transmitting the temperature signal to a frequency converter by a temperature sensor; comparing the temperature signal with a preset rated temperature range, controlling the voltage amplitude of the electric heating tube and further enabling the temperature to be positioned within the rated temperature range by the frequency converter; besides, sensing a real-time air quantity signal in the hot air chamber and transmitting the air quantity signal to the frequency converter by an air quantity sensor; comparing the air quantity signal with the preset rated air quantity range, controlling the voltage amplitude of a motor and further enabling the air quantity to be positioned within the rated air quantity range by the frequency converter. According to the control method disclosed by the invention, the problem that as an existing air heater is single in control function, the temperature and the air outlet volume cannot be simultaneously controlled can be solved.

The present application relates to a detecting method and device for heating of a power transmission line clip and a detecting device. The method comprises the following steps: applying a rated current to a power transmission line, wherein the rated current is a current required when the power transmission line is fully loaded; determining a rated temperature that the power transmission line reaches under the condition of inputting the rated current; detecting an actual temperature that the power transmission line reaches under the condition of inputting the rated current; and determining a clip heating point by comparing the rated temperature and the actual temperature. The clip heating point can be found quickly by using the method; the clip in a hidden danger is found; the method in theinvention can also be used as a new method for fastening a new line clip bolt or not.

A recessed light fixture includes a thermally protected light emitting diode (“LED”) module. The thermally protected LED module includes a thermal protector positioned in series between a source of electrical power and an LED driver and is configured to open a circuit to prevent power from being supplied by the power source to the LED driver for an LED package when a thermal rating or activation temperature of the thermal protector is exceeded. For example, the maximum operating temperature of the LED driver may be 90 degrees Celsius, and the thermal rating of the thermal protector may be 80 degrees Celsius, and when the temperature of the driver or a mounting bracket upon which the driver is mounted reaches 80 degrees Celsius, the thermal protector opens a circuit and removes current flow from the power source to the driver, thereby removing power to the LED package.

The invention discloses a thermal rating method of a delivery wind-power transmission line. On the basis of a relation of a transmission line lead temperature, a service life, and a sag, an optimal decision model of a transmission line thermal rating value is constructed by using a total fan suspending power caused by transmission line thermal rating value limiting within the expected service life of the transmission line as an objective function and using the conductor thermal balance, transmission line tensile strength loss, and security margin restriction as constraints; current carrying values of the transmission line during all periods are calculated; comparison of the current carrying values with an initial thermal rating value is carried out; if the current carrying values are larger than the initial thermal rating value, fan suspending powers in the objective function during the period are calculated and are accumulated; the conductor temperature and the tensile strength loss of the transmission line are updated; and iteration and repetition are carried out continuously until the time objective function of the expected service life of the transmission line becomes zero and then a to-be-decided content is solved. According to the invention, on the basis of the service life of the transmission line and the security margin demand, the conductor tensile strength loss and sag constraints are constructed, thereby effectively eliminating conservatism of the traditional thermal rating method and effectively enhancing the wind-power receiving capability of the power grid.

The invention discloses a method for determining residual life of a fan. The method comprises the following steps that S1, the corresponding relation between the fan life and the fan working environment temperature is obtained; S2, the fan working environment temperature is divided into a plurality of temperature zones, and the fan expected life L corresponding to the temperature zones is converted according to the corresponding relation between the fan life and the fan working environment temperature; S3, the working time of the fan in each temperature zone is obtained; S4, according to the corresponding relation between the fan life and the fan working environment temperature, the working time of the fan in each temperature zone is converted to the working time at the rated temperature;and S5, the residual life of the fan working under the rated temperature is determined. According to the method, the customer can be reminded to replace the fan in time after the residual life of thefan reaches a set value, accidental faults of the fan are prevented, and great loss caused by system accidental shutdown which may occur is avoided.

The invention relates to a method for eliminating the high temperature fault of an antiskid brake control device. With the method adopted, the heat dissipation capacity of the antiskid brake control device can be improved under a condition that a shell material is not changed, so that the surface temperature of the shell of the antiskid brake control device can be lower than 100 Celsius degrees under a 70-Celsius degree high-temperature environment and a working condition. Heat dissipation measures are taken under a condition that the 125-Celsius degree rated temperature of existing high-temperature components is not changed, so that the components can work below 100 Celsius degrees. The cost of improvement is lower than the cost of redesign, energy can be saved, and consumption can be reduced. Aluminum is used to manufacture the shell, and heat dissipation grooves are machined in the shell, an installation height between an antiskid brake control device installation surface and an aircraft is increased, and therefore, the heat dissipation capacity of the shell and the antiskid brake control device installation surface can be enhanced, and high temperature faults generated when the antiskid brake control device is used for a long time under the 70-Celsius degree high-temperature environment can be eliminated.

A method for determining a dynamic rating for a conductive path includes using a sensor to measure a value for a load parameter and selecting a heating process associated with the load parameter. A rated temperature change is changed by removing temperature changes due to a heating process other than the selected heating process to produce an impaired rated temperature change. A thermal load percentage is determined from the impaired rated temperature change. The thermal load percentage and the measured value are then used to determine the dynamic rating for the load parameter. A method also includes measuring a temperature rise, a current, and a voltage on the conductive path multiple times. Using at least two basis functions and the multiple measured temperature rises, currents and voltages, the values for at least two variables are determined. Trends in each variable are determined to determine a condition of electric equipment.

Method for measuring the power line thermal rating or maximum allowable current rating of an overhead power line with respect to a suspended / anchored cable span (2), comprising at least the following steps of:monitoring a motion of at least one point P of said suspended / anchored cable span (2) over a time interval;monitoring actual line current I, in A, over said time interval;determining an actual sag of said suspended / anchored cable, as a variable of actual line current;measuring or determining the effective wind speed of said suspended / anchored cable span (2) over said time interval;determining a sag reserve DF, in m, for thermal rating, which is the distance between the actual sag and a maximum allowable sag;determining the rate of change, tan(α), in m / A2, of the actual sag versus the square of the line current for the effective wind speed;anddetermining the power line thermal rating of the overhead power line, or ampacity, linked to a corresponding safety clearance, at measured or determined effective wind speed, by adding the square of actual current I to the ratio of the sag reserve DF by the sag rate of change, tan(α), at the effective wind speed, and taking the square root of that addition, i.e.Ampacity=I2+DFtan⁡(α),wherein ampacity is in amperes.