Ground continuity monitoring system
阅读：143发布：2021-12-17
专利汇可以提供Ground continuity monitoring system专利检索，专利查询，专利分析的服务。并且In a system which delivers electrical power to remotely located electrical equipment, such as mining equipment, through power conductors in a cable extending from a main source of power to the equipment, the cable including at least two power conductors connected to the electrical input terminals of the equipment and a ground conductor connected to the frame of the equipment, there is added a ground conductor monitoring circuit including power circuit isolating means connected to one of the power conductors of the cable and the ground conductor thereof to provide across a pair of connecting terminals a series circuit including the cable ground conductor isolated from the main power circuit at a given frequency substantially different from the main power source frequency. These connecting terminals are preferably connected across the secondary winding of a transformer having a center tapped primary winding driven by push-pull connected transistors or the like fed by the oppositely phased outputs of a signal generator circuit at said given frequency. The push-pull transistor circuit includes a load resistance on one side of the load terminals thereof constituting one arm of a D.C. bridge circuit, and the load terminals and the primary winding of the transformer constituting the adjacent arm of the D.C. bridge circuit. Control means at the output of the bridge circuit is responsive to the output of the bridge circuit indicating that the impedance reflected into the primary winding exceeds a given value by disconnecting the main power source from the cable power conductors.，下面是Ground continuity monitoring system专利的具体信息内容。
1. In a system which delivers electrical power from a main source of power to remotely located electrical equipment having a pair of energizing input terminals through a cable having at least one pair of power conductors coupled to said energizing input terminals and a monitoring conductor, and interrupter contact means connected between said main source of power and at least one of said cable power conductors, the improvement in means for operating said interrupter contact means to terminate the flow of power from said main source of power to said electrical equipment when the apparent resistance of said monitoring conductor exceeds a given value, said means comprising: a signal generator at the main power inlet side of said cable for producing an output of a given frequency different from the frequency of the output of said main power source, frequency responsive impedance means which substantially excludes the flow of current from said main source of power and presents a low impedance to the output of said signal generator, means forming a circuit across a pair of resistance responsive circuit connecting terminals which circuit includes in mutual series circuit relation said one cable power conductor, said cable monitoring conductor and said frequency responsive impedance means, and a resistance responsive circuit at the power inlet side of the cable including transformer means having primary winding means and secondary winding means, said secondary winding means being coupled across said resistance responsive circuit connecting terminals, means coupling the output of said signal generator to said primary winding means, and means responsive to the change in reflected impedance from said secondary winding means into said primary winding means for opening said interrupter contact means for a reflected impedance indicating an apparent resistance of said monitoring conductor which exceeds said given value.
2. In a system which delivers electrical power from a main source of power to remotely located electrical equipment having a pair of energizing input terminals through a cable having at least one pair of power conductors coupled to said energizing input terminals and a monitoring conductor, and interrupter contact means connected between said main source of power and at least one of said cable power conductOrs, the improvement in means for operating said interrupter contact means to stop the flow of power from said main source of power to said electrical equipment when the apparent resistance of said monitoring conductor exceeds a given value, said means comprising: a signal generator at the main power inlet side of said cable for producing an output of a given frequency different from the frequency of the output of said main power source; frequency responsive impedance means including a D.C. voltage blocking capacitive means which substantially excludes the flow of current from said main source of power and presents a low impedance to the output of said signal generator; means forming a circuit across a pair of resistance responsive circuit connecting terminals which circuit includes in mutual series circuit relation said one cable power conductor, said cable monitoring conductor and said frequency responsive impedance means; a reflected resistance responsive circuit including transformer means having primary winding means and secondary winding means, said secondary winding means being coupled across said resistance responsive circuit connecting terminals, a source of D.C. voltage, current control means having load terminal means and control terminal means which control the flow of current through the load terminal means in accordance with the signal fed thereto when a source of D.C. voltage is coupled across the load terminal means, means connecting the output of said signal generator to said control terminal means to generate a signal in said primary winding means coupled through said secondary winding means to said circuit across said resistance responsive circuit connecting terminals, means coupling said load terminal means, said primary winding means and said source of D.C. voltage in mutual series circuit relation so a control signal fed to said control terminal means will control the flow of current through said load terminal means, and means responsive to the change in current flow through said load terminal means due to the change in reflected impedance from said secondary winding means into said primary winding means for opening said interrupter contact means for a reflected impedance indicating an apparent resistance of said monitoring conductor which exceeds said given value.
3. The power system of claim 2 wherein said reflected resistance responsive circuit is a bridge-forming circuit having a pair of input terminals connected across said source of D.C. voltage, a pair of output terminals, a first resistance arm connected between one of said bridge input terminals and one of said bridge output terminals, a second resistance arm connected between the other of said bridge input terminals and said one bridge output terminal, a third resistance arm connected between said other bridge input terminal and the other bridge output terminal, said load terminal means of said current control means and said primary winding means constituting a fourth arm of said bridge circuit coupled between said other bridge output terminal and said one bridge input terminal, and control means coupled across said bridge output terminals for opening said interrupter contact means when the voltage conditions at said bridge output terminals indicates that the apparent resistance of the cable monitoring conductor exceeds said given value.
4. The power system of claim 3 wherein said current control means are a pair of current control devices each having a pair of load terminals and a control terminal, said primary winding means is a center-tapped primary winding where the center tap point is connected to said one bridge input terminal and the opposite ends of said primary winding are respectively coupled to the corresponding load terminals of said current control devices, the other load terminals of said current control devices being coupled together and to said other bridge output terminal, said signal generator having a pair of output terminals at which respectively appeAr signals at said given frequency 180* out of phase, said output terminals of said signal generator are respectively connected to the control terminals of said current control devices which are Class B operated thereby, so the devices are rendered alternately conductive in the same direction during successive half cycles, to provide a substantially continuous D.C. current flow in the connection between said center tap point of said primary winding and said one bridge input terminal.
5. The power system of claim 4 wherein said current control devices are transistors of the same type, and the signal at said output terminal of said signal generator drive the transistors into saturation.
6. The power system of claim 5 wherein the output signals at the signal generator are square wave signals.
7. The power system of claim 2 wherein said electrical equipment has a frame, and said cable monitoring conductor is grounded to said frame.
8. The power system of claim 7 wherein said frequency responsive impedance means comprises a first frequency responsive impedance means coupled between the power outlet end of said cable power conductor and the corresponding end of said cable monitoring conductor.
9. In a system which delivers electrical power from a main source of power to remotely locate electrical equipment having at least one pair of energizing input terminals and conductive frame means through a cable having at least one pair of power conductors coupled to said pair of energizing input terminals and a ground conductor connected to said frame means, and interrupter contact means connected between said main source of power and at least one of said cable power conductors, the improvement in means for operating said interrupter contacts to terminate the flow of power from said main source of power to said electrical equipment when the apparent resistance of said conductor exceeds a given resistance value, said means comprising: a signal generator at the main power inlet side of said cable for producing an output of a given frequency different from the frequency of the output of said main power source, frequency responsive impedance means which excludes the flow of current from said main source of power and presents a low impedance to the output of said signal generator, means forming a circuit across a pair of connecting terminal means which circuit includes in mutual series circuit relation said one cable power conductor, said cable monitoring conductor and said frequency responsive impedance means, the output of said signal generator being coupled to said connecting terminal means; and a resistance bridge-forming circuit at the inlet side of said cable, said resistance bridge-forming circuit including a pair of input terminals extending to a source of energizing voltage and a pair of output terminals, a first resistance arm connected between one of said bridge input terminals and one of said bridge output terminals, a second resistance arm connected between the other of said bridge input terminals and said one bridge output terminal, a third resistance arm connected between said other bridge input terminal and the other bridge output terminal, and means coupling the latter bridge output terminal and said one bridge input terminal between said connecting terminal means so the voltage across said output terminals of said resistance bridge-forming circuit varies with the cable ground conductor resistance; and means coupled across the bridge output terminals for opening said interrupter contacts when the voltage conditions at said bridge output terminal indicates that the ground conductor resistance exceeds said given value.
10. The power system of claim 9 wherein said frequency responsive impedance means comprise a first frequency responsive impedance means coupled between the power outlet end of said cable power conductor and the corresponding end of said cable monitoring conductor and a second frequency responsive impedance means coupled beTween the inlet end of said cable power conductor and one of said resistance responsive circuit connecting terminal means.
11. The power system of claim 9 wherein said electrical equipment has a frame, and said cable monitoring conductor is grounded to said frame.
12. The power system of claim 11 wherein said frequency responsive impedance means comprises a first frequency responsive impedance means coupled between the power outlet end of said cable power conductor and the corresponding end of said cable ground conductor.
13. In a system which delivers electrical power from a main source of power, having at least a pair of output terminals across which a source of voltage appears, to remotely located electrical equipment having at least one pair of energizing input terminals and a grounded conductive frame, through a cable having at least one pair of power conductors coupled to said energizing input terminals of said electrical equipment and a ground conductor connected to the frame of said electrical equipment, interrupter contact means connected between at least one of said output terminals of said main source of power and at least one of said cable power conductors, and an interrupter contact control circuit including control means for opening said interrupter contact means when energized, current limiting means and means coupling said control means and said current limiting impedance means in series between the power inlet side of said cable ground conductor and a terminal of said main source of power, wherein a short circuit between the frame of said electrical equipment and one of said power conductors will result in the flow of current through said control means which will effect the opening of said interrupter contact means, the improvement comprising: a signal generator at the inlet side of said cable for producing an output of a given frequency different from the frequency of the output of said main power source; frequency responsive impedance means coupled between the power outlet end of said cable power conductor and the corresponding end of said cable which excludes the flow of current from said main source of power and presents a low impedance to the output of said signal generator; and a resistance responsive circuit coupled across the power inlet ends of said one cable power conductor and said cable ground conductor and to the output of said signal generator, wherein the output of said signal generator is coupled through said resistance responsive circuit to the power inlet ends of said one cable power conductor and said cable ground conductor, said resistance responsive circuit being responsive to the presence of impedance conditions across the power inlet ends of said one cable power conductor and said cable ground conductor indicating an undesirably high load resistance by effecting the opening of said interrupter contact means.
14. The system of claim 13 wherein there is provided frequency responsive impedance means connected in series with said control means for providing a relatively high impedance at the frequency of the output of said signal generator and a very low impedance to the output of said main source of power.
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