Solid state thermal overload indicator专利检索-线路跳闸分销网络和设备专利检索查询-专利查询网

Solid state thermal overload indicator

阅读：341发布：2022-07-28

专利汇可以提供Solid state thermal overload indicator专利检索，专利查询，专利分析的服务。并且A solid state overload indicator of the inverse-operating characteristic type which is more mindful of the electrical thermal characteristics of the load as it is heated. According to the embodiment disclosed for a motor load and having an independently adjustable stall operating time and running overload trip level, the indicator has analog means, for the thermal resistance and capacitance of the copper in the motor for accounting for the heat energy stored in the motor, connected between one DC bus, and a conductor. Voltage-sensitive indicating means is connected to the conductor for producing an indication for a particular voltage thereon, corresponding to the minimum excessive load temperature. First and second voltage-dependent current valves are each connected between the conductor and the other bus and to current-to-voltage transducers connected in the lines to the motor whereby the voltage on the conductor is a function of the motor current subject to the capacitance and equal to the particular voltage for each value of current after a time according to the indicator characteristic has elapsed. The first and second current valves are adjustable for presetting the trip level and the stall time respectively; the second current valve is on only for overloads greater than some value of overload between the stall and running overloads so that the two can be present independently of each other.，下面是Solid state thermal overload indicator专利的具体信息内容。

权利要求

1. For use in protecting a motor load connected to a power source, a static overload indicator having an inverse operating characteristic closely resembling the thermal damage curve for the motor and having operating times for stall and running overload level which can be preset independently of each other, said indicator comprising a pair of DC buses from another power source; a conductor; electrical analog means having resistance and capacitance means connected between one bus and said conductor and simulating the thermal characteristics of said motor for accounting for heat energy stored therein; means for producing a voltage proportional to the overload; voltagesensitive indicating means connected to said conductor for producing an indication of a particular voltage thereon; and first and second voltage-dependent current valves each connected between said conductor and the other bus and to the voltageproducing means whereby the voltage on said conductor is a function of said motor current subject to the stored heat energy and equal to said particular voltage for each value of current after a time according to said characteristic has elapsed, said first and second current valve being adjustable for presetting said level and time for said running and stall overloads respectively and said second current valve assisting said first current valve only for overloads greater than some value of overload between said stall and running overloads so that the running overload level and stall overload time can be preset independently of each other.

2. For use in protecting a motor connected to a power source, a static overload indicator whose inverse operating characteristic closely resembles the thermal damage curve for the motor and operating times for stall and running overload can be preset independent of each other, said indicator comprising a pair of DC buses from another power source; a conductor; electrical analog means having resistance and capacitance means simulating the thermal resistance and capacitance of said motor for accounting for the heat energy stored in said motor and connected between one bus and said conductor; means for producing a voltage proportional to said overload; voltage-sensitive indicating means connected to said conductor for producing an indication of a particular voltage thereon; first and second voltage-dependent current valves each connected between said conductor and the other bus and to the voltage-producing means whereby the voltage on said conductor is a function of said motor current subject to the stored heat energy and Equal to said particular voltage for each value of current after a time according to said characteristic has elapsed; first means for adjusting the voltage from the voltage-producing means to said current valves for presetting said level for said running overcurrent; second means for adjusting the voltage from the voltage-producing means to said second current valve for presetting said time for said stall overload; and means for tuning off said second current valve for overloads less than some value of overload between said stall and running overloads so that said operating times can be preset independently of each other.

3. The indicator as claimed in claim 2 wherein said electrical analog means includes a resistor in parallel with a capacitor, the resistor and capacitor representing said thermal resistance and capacitance respectively.

4. The indicator as claimed in claim 3 wherein said current valves are bipolar transistors.

5. The indicator as claimed in claim 3 wherein the means for turning off said second current valve is a zener diode.

6. The indicator as claimed in claim 2 wherein said particular voltage may be varied for varying said characteristic.

7. For use in protecting a load connected to a power source and having an inverse thermal damage curve, a static overload indicator whose operating characteristic closely resembles said curve and operating time can be preset for one value of overcurrent, said indicator comprising a pair of DC buses from another power source; a conductor; electrical analog means having resistance and capacitance means simulating the thermal characteristics of said load for accounting for heat energy stored in said load and connected between one bus and said conductor; means for producing a voltage proportional to the motor current; voltage-sensitive indicating means connected to said conductor for producing an indication of a particular voltage thereon; and a voltage-dependent current valve connected between said conductor and the other bus and to the voltage-producing means whereby the voltage on said conductor is a function of said motor current subject to the stored heat energy and equal to said particular voltage for each value of motor current after a time according to said characteristic has elapsed, said current value being adjustable for presetting said time for said one value of overload.

8. The indicator as claimed in claim 7 having another voltage-dependent current valve connected between said conductor and other bus and to the voltage-producing means and being adjustable for presetting the operating time for a second value of overload greater than said one value, said another current valve assisting the first current valve only for currents greater than some value of current between said one and second values so that the operating times can be preset independent of each other.

9. The indicator as claimed in claim 7 wherein said electrical analog means includes a resistor in parallel with a capacitor, the resistor and capacitor representing the thermal resistance and capacitance respectively of said load.

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Solid state thermal overload indicator

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