Temperature compensation method of thermal relay
A technology of thermal relay and temperature compensation, which is applied in the direction of calibration/finding protection device, protection switch operation/release mechanism, etc., which can solve the problems that the compensation device cannot be compensated correctly, and the clutch characteristic operation of the thermal relay cannot be guaranteed.
Active Publication Date: 2014-02-12
SCHNEIDER ELECTRIC IND SAS
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Problems solved by technology
However, the thermal relay does not always work in this temperature range. Sometimes, for example, when the user uses the thermal relay at -25°C, since the temperature change has a great influence on the deformation of the bimetal, there is no guarantee that the thermal relay can Operate with predetermined clutch characteristics
Moreover, since the above-mentioned compensating device is only designed for a limited temperature range such as -5°C to +40°C, the compensating device cannot compensate correctly when the temperature exceeds this range, so it is impossible to ensure that the thermal relay Consistent trip characteristics at these temperatures
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[0031] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
[0032] First, refer to figure 1 , Figure 2A and Figure 2B , describing the structure of the thermal relay and the structure of the temperature compensation device according to the present invention. The thermal relay 100 includes a main bimetal 200 associated with a trip bar 300 of the thermal relay 100 . When current flows through the main bimetal 200, heat will be generated, which will cause the deformation of the main bimetal, and the deformation of the main bimetal will drive the trip rod 300 along the figure 1 Move in the left direction. When a current exceeding a predetermined current flows through the main bimetal 200, the deformation of the main bimetal 200 exceeds a predetermined value, thereby driving the trip bar 300 to move over a predetermined distance (hereinafter referred to as the trip distance), so that ...
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The invention provides a temperature compensation method of a thermal relay. The method comprises the steps of calculating the variable quantity a of a tripping distance caused by environment temperature changes, calculating the variable quantity b of the tripping distance in each rotation unit angle of a compensation cam, calculating compensation angle difference c according to the variable quantity a and the variable quantity b, and rotating the compensation cam and the compensation angle difference c in the preset direction. Through the method, when the thermal relay works under temperature surpassing a rated temperature range, the compensation cam can be rotated to adjust the rated current of the thermal relay. Consequently, the thermal relay can work normally.
Description
technical field [0001] The invention relates to a thermal relay, and in particular to a temperature compensation method for the thermal relay. Background technique [0002] Thermal relays are used for overload protection of motors, etc., and generally include thermal induction devices such as thermal induction bimetallic strips, thermal induction displacement transfer devices such as tripping rods, contact clutch devices such as tripping devices, and housings. When the working current of the motor is overloaded, the thermal induction bimetal in the thermal induction device bends, and the contact of the contact clutch device is driven to leave through the thermal displacement transfer device, also known as tripping, and the control connected with the contact clutch device The circuit is disconnected, and the power supply controlling the motor is disconnected, thus realizing the protection of the motor. [0003] Considering that the degree of bending of the heat-sensitive bim...
Claims
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IPC IPC(8): H01H69/01H01H71/16
Inventor 李超凡邵勋潘俊杰付春艳
Owner SCHNEIDER ELECTRIC IND SAS