Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system专利检索-配电变压器变压器电机电气元件和设备专利检索查询-专利查询网

Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system

阅读：564发布：2022-05-05

专利汇可以提供Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system专利检索，专利查询，专利分析的服务。并且Disclosed is an overcurrent-fault indicator apparatus for locating a trunk line fault in a power distribution system. The apparatus includes a pair of input terminals adapted to be connected with the primary and secondary of a power distribution transformer, first and second switches which may be a zener diode and reed-type contact, respectively, coupled to the first input terminal through a full wave rectifier, indicating display means which is actuated by the closing of the first and second switch, and second switch closing means coupled to the other input terminal for closing said second switch, this closing means including time delay circuitry provided by a resistor and capacitor for temporarily delaying the opening and closing of the reed switch.，下面是Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system专利的具体信息内容。

权利要求

1. In a power distribution system of the type having a pair of primary service voltage feeder cables coupled to a plurality of trunk lines through respective circuit breaking means, wherein each of said trunk lines has a plurality of parallel-connected distribution transformers connected therewith, and wherein each of said transformers has fault indicating apparatus connected thereto, the improvement wherein said fault indicating apparatus comprises: a. first input means coupled to the primary cable of said distribution transformer, b. second input means coupled to the secondary winding of said distribution transformer, c. first and second switches coupled to said first input means, d. indicating means for producing a signal only when said first and second switches are both closed, e. said first switch only closing in response to excessive current flowing through said primary cable of said distribution transformer, and f. means coupling said second input means with said second switch for closing said second switch in response to a voltage produced at said secondary, said means including time delay means for temporarily delaying said closing of said second switch.

2. Fault indicator apparatus, comprising: a. a first and second input terminal, b. a current transformer connected with said first input terminal, c. a full wave rectifier connected to the output of said current transformer, d. first and second switches coupled to output terminals of said full wave rectifier, said first switch provided by a zener diode which cathode is connected to an output terminal of said full wave rectifier, said second switch provided by an electromagnetically actuated reed contact, e. visual indicating means coupled to said first and second switches actuated when said first anD second switches are closed, f. said first switch being closed by the breakdown of said zener diode by a voltage induced by said current transformer corresponding to an excessive current flowing through said current transformer, g. a second full wave rectifier coupled to said second input terminal, and h. the positive output of said second full wave rectifier coupled through a resistor to a network comprising another zener diode connected in series combination with a coil electromagnetically coupled to said reed contact, and a parallel combination of resistor and capacitor connected across said series combination.

3. The apparatus as described in claim 2 including another transformer, the primary of which is connected to said first input terminal, the secondary of which is coupled to said second input terminal.

4. Fault indicator apparatus for a power distribution system comprising: a. first and second input means adapted to be coupled to the power distribution system; b. first switch means coupled to said first input means and including means for preventing closure of the first switch means until the voltage at the first input means exceeds a predetermined level representing a greater than normal current flow in the power distribution system, said first switch means comprising a zener diode having a breakdown voltage which establishes said predetermined level; c. second switch means comprising an electromagnetically actuated reed contact; d. indicating means coupled in circuit with said first and second switch means for producing a signal when said first and second switch means are both closed; and e. means coupled between said second input means and said second switch means for closing said second switch means in response to voltage occurring at said second input means, said means for closing said second switch means including time delay circuitry for temporarily delaying the closing of said second switch means when voltage appears at said second input means and temporarily delaying the opening of said second switch means when voltage is removed from said second input means.

5. Apparatus as described in claim 4 wherein said means for closing said second switch means comprises a zener diode in series combination with a coil electromagnetically coupled to said reed contact and a capacitor and resistor connected in parallel across said series combination.

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Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system

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