Overload protection method and device
An overload protection and average power technology, which is applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve problems such as inaccurate judgments and delays in overload protection actions, and achieve the effect of protecting safety
Active Publication Date: 2013-02-27
吕纪文
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[0009] The embodiment of the present invention provides an overload protection method and device, which are used to solve the problems in the prior art that the overload protection only uses temperature devices, the overload protection action lags behind, and the judgment is not accurate enough
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[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0041] Such as figure 1 Shown is a flow chart of an overload protection method according to an embodiment of the present invention.
[0042] Step 101, acquiring real-time current and voltage data in the power supply loop.
[0043] Step 102, converting the current and voltage data into discrete values.
[0044] Step 103, calculate the instantaneous power and average power output by the power supply circuit according to the discrete values of the current and volt...
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The invention relates to the field of electrical safety, and provides an overload protection method and an overload protection device which are used for solving the problems of inaccurate overload protection and protection action lagging in the prior art. The method comprises the following steps of: acquiring real-time current data and real-time voltage data in a power supply loop; converting the current data and the voltage data into discrete numerical values; calculating instantaneous power and average power output by the power supply loop according to the discrete numerical values of the current and the voltage; and if the instantaneous power exceeds a preset instantaneous peak power threshold or the average power exceeds the preset average power threshold, cutting off the power supply loop. The embodiment of the invention has the advantages that: by making a difference between the instantaneous power overload and the average power overload and accurately identifying heavy current starting of the equipment and line short-circuiting characteristic, more accurate protection control of the power supply loop can be realized, and the probability of error action of the protection device can be effectively reduced on the premise of guaranteeing the safety of electrical equipment and the power cables of the loop.
Description
technical field [0001] The invention relates to the field of electrical safety, in particular to an overload protection method and device. Background technique [0002] The amount of current that is allowed to pass continuously in an electrical circuit without overheating the wire is called the safe current carrying capacity or safe current. If the current flowing through the wire exceeds the safe current carrying capacity, it is called wire overload. Generally, the maximum allowable working temperature of the wire is 65°C. When overloaded, the temperature exceeds this temperature, which will cause rapid aging of the insulation and even burn the wire. There are many reasons for overload, such as improper selection of wire cross section, the actual load has exceeded the safe current of the wire; another example is that too many high-power devices are connected to the line, which exceeds the load capacity of the distribution line. Lighting lines in important material warehou...
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IPC IPC(8): H02H3/42H02H3/04
Inventor 吕纪文
Owner 吕纪文