MXPA97001093A

MXPA97001093A - Electronic percutor device comprising ener supply disposal

Info

Publication number: MXPA97001093A
Application number: MXPA/A/1997/001093A
Authority: MX
Inventors: Ferrazzi Marc
Original assignee: Schneider Electric Sa
Priority date: 1996-02-22
Filing date: 1997-02-12
Publication date: 1997-08-01

Abstract

The present invention relates to an electronic percussion device for a circuit breaker comprising: at least one current sensor that supplies a secondary current representative of a current flowing in a conductor of an energy system protected by the circuit breaker; processing that receives signals representative of currents that flow in conductors of the energy system protected by the circuit breaker, and that provides a percussion order, a first power supply that comprises an input connected to the current sensor, or an output connected to a supply line of energy supplying electric and electronic circuits of the percussion device, a first regulating element connected between the input and the output of the first power supply circuit, and a second power supply circuit comprising an input connected to a power source external electrical and an output connected to the power supply line, the percussion device characterized in that it comprises second regulating elements comprising an input connected to the output of the second power supply circuit, an output connected to the power supply line, and a connected control element to the first cutter regulating element, the control element controlling the second regulating element to reduce the average current supplied by the second power supply circuit when the current supplied by the current sensor increases

Description

ELECTRONIC PERCUTOR DEVICE THAT COMPRISES A DEVICE OF ENERGY SUPPLY BACKGROUND OF THE INVENTION The invention relates to an electronic striker device for a circuit breaker comprising: at least one current sensor that supplies secondary current representative of a current flowing in a conductor of an energy system protected by the circuit breaker , - a processing unit which receives signals representative of currents flowing in conductors of the power system protected by the circuit breaker, and which supplies a dither order, - a first power supply circuit comprising an input connected to the current sensor , an output - connected to a power supply line that supplies electrical and electronic circuits of the percussion device, and first regulator element connected between the input and the output of the first power supply circuit, and - a second supply circuit of energy comprising an input connected to a Q electrical power source and an output connected to the power supply line. Electronic percussion devices are known types that include power supply circuits to provide the electrical energy necessary for operation of the electronic circuit and percussion relay. The power supply circuits are generally connected to current transformers equipped in power conductors of the power system to be protected. The currents supplied by the transformers are then rectified applied to a circuit of their energy minister that supplies direct current voltages to the different circuit breakers. The power supply circuits comprise in the state of the field cut-off regulators that cut off the secondary current of the transformers when the supplied voltage exceeds a pre-established threshold. The current supplied by the current transformers is generally sufficient to allow the nromal operation of the percussion device. The percussion devices comprise auxiliary circuits designed for functions connected to electrical protection, for example, measurement of electric power, charge supervision, isolation or leakage current supervision. When the ancillary circuits are present in the percussion device, the current supplied by the transformers may not be sufficient to supply all the circuits. The main function of the percussion devices -electronics being the protection of the electrical energy systems, the electrical energy supplied by the transformers is reserved in priority for the circuits that carry out this protection. In certain known percussion devices, the positive directions of power supply direction disable the operation or stop the power supply of auxiliary circuits when the current supplied by the transformers becomes insufficient. It is also known to use an additional power supply circuit to compensate for the insufficiency of current supplied by transferers. The power supply circuit is connected to an external voltage source to the circuit breaker and the circuit breaker is continuously energized, even when the transformer current is very low or zero. The external voltage source applied to the power supply circuits may have elevating values. Generally, it corresponds to the voltage of the power supply system 5 to be protected, for example 100 to 700 V. However, the voltage supplied by the power supply circuits has a low value of approximately 10 to 20V and it must preferably be galvanically isolated from the external source. The electrical energy dissipated by the 0 power supply circuits is then generally high and elements have to be used which make the electronic energy components bulky. The additional power supply circuits can easily be incorporated into circuit breakers of very large dimensions. For circuit breakers of smaller dimensions, the circuits are usually equipped in modules external to the circuit breakers. The integration of additional power supply circuits is very difficult. The space available in circuit breakers of medium or small dimensions is usually very small and the flow of large currents in the contacts and main conductors of the circuit breakers causes the working temperature to rise. This high temperature in circuit breakers would lead to chill the dimensions of the components that make up the circuit. An increase in the volume occupied by the components would be, however, incompatible with the small space available to the dissimilators.

SUMMARY OF THE INVENTION The object of the invention is to achieve an electronic impact device comprising an integrated additional power supply device. According to the invention, the percussion device comprises second regulating elements comprising an input connected to the output of the second supply circuit; energy source, an output connected to the power supply line and control elements connected to the first cutter regulator element, the control element controlling the second regulator element to reduce the average current supplied by the second power supply circuit when the current supplied by the current sensor increases.

In a particular embodiment, the second regulating element comprises current limiting elements connected to the input and output of the regulating element, the cooling element limiting being controlled by the control element. In accordance with a preferred method, the first regulator element comprises a first cutter regulator, the second regulator element comprises a second cutter regulator, and the control element comprises synchronization elements connected between the first and second cutter controllers. In a development of the preferred embodiment: the first cutter regulator comprises current dividing elements connected to the input of the first guide element and first detection element connected between the power supply line and the dividing element, the element of detection by ordering the shortcut of the input of the first regulating element when the voltage of the power supply line exceeds a first pre-established threshold, and - the second cut-off recloser commutates current interruption elements controlled by the control element, the control element ordering the interruption of the current supplied by the second regulator when the first regulator element orders the short-circuit of the input of the first regulator element. In a first development of the invention, the output of the second regulating element is connected to the input of the first regulating element. In a second development of the invention, the output of the second regulating element is connected to the output of the first regulating element. Preferably, the second power supply circuit comprises a rectifier circuit connected to the external power source, a voltage limiter connected to the rectifier circuit outputs, and a cutter connected to the outputs of the limiter and supply a voltage to the rectifier circuit. an array of the second regulating element. The cutter comprises a transformer comprising a primary winding supplied by means of an oscillator and a secondary winding electrically isolated from the primary winding and connected to the winding of the second winding element. The cutter is preferably of the return type BRIEF DESCRIPTION OF THE DRAWINGS Other advantages and particularities will become more clearly evident from the following description of illustrative embodiments of the invention, provided as non-restrictive examples only and represented in the accompanying drawings, in which: Figure 1 represents a diagram of a known percussion device associated with a disjuncts.

Figure 2 represents the diagram of a percussion device conforming to a first embodiment of the invention, Figure 3 shows the diagram of a percussion device conforming to a second embodiment of the invention, the Figures 4a to 4c show electrical signals representative of a regulation mode of a percussion device in accordance with FIGS. 2 6 3, FIG. 5 shows a detailed diagram of a percussion device according to FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY Figure 1 represents a circuit breaker of the known type. An electrical power system 1 to be protected comprises electrical conductors connected to contacts 2 which enable the current to be drawn or interrupted. The T1 sensors, T2, T3 of current associated to the different system-energy conductors transform the high intensity primary currents into secondary correctors compatible with the electronic percussion devices. The secondary currents are applied to the input of a rectification and detection circuit 3. This circuit supplies signals representative of the currents a an electronic processing unit 4 and a power supply current to a first power supply circuit 7 of the percussion device. A percussion order produced by the processing unit 4 is applied to the input of a control relay 5 which drives a mechanism 6 for opening the circuit breaker contacts 2. The power supply circuit 7 supplies the electrical and electronic circuits of the percussion device, notably the processing unit 4, the relay 5 and the auxiliary circuits 8 through a power supply line 10. A second power supply circuit 9, connected between the source 11 of external electrical energy and the power supply line 10, supplies the electronic and electrical circuits 4, 5, and 8 of the percussion device when the current supplied by the sesnores is no longer enough. In the drawing of figure 1, the first circuit 7 of its energy minister converts the current ltc supplied by the sensors to one or more direct current flows that supply the power supply line 10. The second power supply circuit 9 converts the first voltage VL -from direct current or alternating current supplied by source 11 to a second direct current voltage that supplies line 10. The power supply line is preferentially gávanically isolated from source 11 external. In the electronic percussion device shown in the drawing of Figure 2, the current transformers% 1, T2 and T3 are connected to alternating current inputs of three rectifier bridges respectively, 3A, 3b and 3c. The positive outputs of the rectifier bridges are connected to a line 12 and the negative outputs of the bridges are connected to a reference line 0. The line 12 connects the positive outputs of the bridges to a first of the first circuit 7 of S energy minister. The secondary currents generated by the current transducers are rectified by the bridges 3a, 3b and 3c, then supplied to the input of the first power supply circuit 7. In the manner of the state of the branch, the first power supply circuit 7 comprises a diode 13 connected between an input connected to the line 12 and an output connected to the power supply line 10, a capacitor 14 co-connected between the output and the reference line 0, a transistor 15 connected between the input and the reference line 0, and a first cutter driver 16 connected between the power supply line 10 and the reference line 0 and comprising an output connected to a control electrode of the transistor 15. The current supplied by the transformers T1, -T2, or T3 is rectified by means of the bridges 3a, 3b or 3c. Then, while the transistor 15 is disconnected, the current flies through the diode 13, charges the capacitor 14 and supplies the circuits connected to the line 10. When the voltage between the line 10 and the reference line 0 , ie, the voltage Ve in the terminals of the capacitor 14, exceeds the pre-set voltage threshold, the cutter regulator 16 commands to connect the transistor 15. The current of the transformers is then divided to the reference line 0 and no longer flows through line 10 of your energy minister. The diode 13 blocks the discharge of the capacitor to the transformer 15. The cutter regulator 16 controls the connection and disconnection of the co-ordinance transistor 15 with the voltage present in the power supply line 10. The cut-off frequency and the cycle rate vary according to the current of the transformers and the current absorbed by the circuits connected to line 10. If the current of the transformers increases., the average time during which the transistor 15 is turned on and the time during which the transistor is off decreases, the capacitor charge current being higher. Confronted with a first embodiment of the invention, the percussion device of FIG. 2 comprises a regulating circuit 17 connected between the second power supply circuit 9 and the power supply line 10. The circuit 17 comprises an input that receives a direct current or recited voltage supplied by the power supply circuit 9 and an output that supplies a regulated current to the line 10. The regulation of the current of the circuit 17 is such that The average value of the current supplied by the circuit 17 to the line 10 decreases when the current from the transformers T1, T2 or T3 increases. The control circuit 17 comprises a transistor 1 and diode 19 connected in series between its input and its output, and control device 20 connected to the base of the transistor 18 for control of the current supply to the line 10. The device 20 of Supervision controls the transistor 18 in cut. It connects an input connected by a synchronization line S to the cutter regulator 16. In this embodiment of the invention, the control device is synchronized with the cutting regulator 16. When the regulator detects an increase in the line voltage, it orders the connection of the transistor 15 to divert the input current from the supply circuit 7 and sends a signal to the device 20 to disable the output current of the regulator circuit 17. The current supplied by the regulator circuit 17 is synchronized with the load of the capacitor 14. When the transistor 15 is disconnected, the current of the transformers and the current of the circuit 17 are added to charge the capacitor 1 and increase the line voltage. 10. During the discharge of the pacitor, the current of the transformers is diverted to line 0 and the current supplied by circuits 9 and 17 is zero. the time during which the capacitor 14 loads depends on the value of the current supplied by the current transformers d and the value of the current supplied by the circuit 17. The average value of the current supplied by the circuit 17 depends on the cycle rate corresponding to the load and discharge time of the capacitor 17. The circuit 17 supplies current to the line 10 only during the charging of the capacitor. When the current supplied by the transformers increases, the charging time of the capacitor is reduced and the average current supplied by the circuit 17 decreases. The drawing of figure 3 shows another embodiment of the percussion device according to the invention. The output of the regulator circuit 17 is connected to the input of the first power supply circuit 7. The regulator 16 comprises a first comparator 21 with hysteresis for comparing the voltage of the line 10 with a reference voltage and the control operation of the transistor 15. The circuit 17 comprises a controlled current limiter 22 co-located between the input and the output of the circuit 17. The control circuit 20 comprises a second comparator 23 having a first input connected to the output of the circuit 17, a second output connected to a reference voltage and an output co-connected to the current limiter 22. to control the output current of the circuit 17. The synchronization of the control circuit 20 with the co-regulating regulator 16 is carried out by means of the connection between the output of the circuit 17 and the input of the cirucito 7. When the pacator c_a has been charged, the comparator 21 commands the disconnection of the transistor 15. The current of the transoformers T1, T2 or T3 is then directed to the capacitor 14 and the line 10. The comparator 23 of the circuit 20 detects a high voltage Vt at the output of the circuit 17 (voltage at the terminals of the transistor 15 which is disconnected) and orders the supply of a current through the circuit 17 to the input of the circuit 7. The current supplied through the circuit 17 is added to the current of the current transradrids.As soon as the voltage seen at the terminals of the capacitor 14, ie the voltage of the line 10, reaches a previously established threshold, the comparator 21 commands the connection of the transistor 15 to divert the input current of the circuit 7. The short circuit achieved by transistor 15 causes the voltage Vt at the input of circuit 7 and the output of circuit 17 to drop. The comparator 23 detects this low voltage due to the short circuit and then incapacitates the traffic limiter 22 to interrupt the supply of current to the input of the circuit 7. As in the first mode, the circuit 17 supplies current to the line 10 only during the charge of the capacitor. The current flows, in this case, through the first power supply circuit 7. In the drawing of Figure 3, a particular embodiment of the second power supply circuit 9 comprises a rectifier circuit 24 connected to the external surface 11, a voltage limiter 25 connected to the outputs of the rectifier circuit, and a cutter 26 connected to the outputs of the limiter 25 and supplying a voltage to the input of the circuit 17. The rectifier 24 comprises inputs connected to the external source 11 and outputs that supply a direct current or polarized voltage. The source 11 can be direct current or alternating current, single phase or three phase. The circuit 25 limits the maximum value of the direct current voltage applied to the inputs of the cutter 26. The cutter 26 shifts a transformer 27 having a primary winding 28 and a secondary winding 29. The primary winding is connected to the inputs of the cutter and is supplied through an electromotive oscillator. The secondary winding is connected to the circuit 17 by means of a rectifier diode 31. The transformer 27 isolates the source 11 galvanically from the percussion device. The operation of the cutter is preferably of the Return type. Figures 4a to 4c represent representative signals of the power supply of a percussion device according to the invention. Figure 4a shows the corriejí te ltc supplied by the current transformers. Between the layers tO and ti, the current is zero. Between time t1 and t2, the current is of small amplitude and between time t2 and -t23, the current is of large amplitude.

Figure 4b shows the state of the transistor 15 and the corresponding voltage at its terminals Vt. The state 1 means that the transistor 15 is disconnected and that the voltage Vt -is high, notoriously equal to the voltage of the line 10. The state 0 means that the transistor 15 is connected and that its volatile Vt is very low, close to 0 volts. Figure 4c shows the signal Ve representative of the voltage of line 10, or voltage at the terminals of capacitor 14. Variations of voltage Ve represent the load and desire ga of epaacitor 14. Figure 4d shows the current that is supplied by the regulation circuit 17. Between the times tO and ti, the current ltc is zero, and the percussion device is supplied only by the current its insitrada to the circuit 17. The charging time of the pacitor c is prolonged and, in each cycle of load / discharge of the cap citor, the supply time of the current ls is greater than the time during which the current is disconnected. In the embodiment shown at time tO, the capacitor 14 is already charged at a voltage close to the threshold voltage which controls the connection of the transistor 15, the supply of external power is in operation. Between the times ti and t2, the current ltc is low, the percussion device is supplied by the current ls the current ltc. The supply duration of the current ls, per cycle, is shorter than between the times tO and t2. The average run supplied by circuit 17 to line 10, therefore, decreases. Between the times t2 and t3, the current ltc is high, the charging time is reduced and the duration of supply of current ls, per cycle, lower than the connection duration of -the current is shorter than between you and t2. The average current supplied by circuit 17 to line 10, therefore disrr? nuye even more. Figure 5 shows a detailed drawing of a particular embodiment of the energy supply of a circumvention device according to Figure 3. In this drawing, only the TI transformer is represented. The rectifier 3a is represented by four diodes 32, 33, 34 and 35 connected as a full-wave rectifier. The cathodes of the diodes 32 and 33 S supply positive current to the line 12 connected to the transistor 15 and the diode 13. The anodes of the diodes 34 and 35 receive the current change 1 through a resistor 36 of measurement and reference line 0. The regulation circuit 16 comprises the comparator 21 operating in accordance with a hysteresis cycle. The resistors 37, 38 and 39 are connected between the non-inverting input and the comparator output, the line 0 and the line -10, thus determining the threshold and window of the hysteresis. A zener diode 40 connected between the reversing input and line 0 adjusts a reference voltage of the comparator. The polarization of the diode 40 is carried out by a resistor 41 connected between the line 10 and the cathode of the diode. A capacitor 42 connected in parallel to the diode 40 improves the operation and activation. The output of the gauge is biased by a resistor 43 which connects the output of the comparator to line 10. A zener diode connected between the output of the comparator 21 and the gate of the transistor 15 limits the control voltage of the transient. The polarization of the gate of the transistor 15 and the diode of the zener is made by a resistor 35 that connects the ccm gate of the transsitor 15 to the line 0. The cutter 26 only a part of which is shown in FIG. polarized voltage. This voltage is a direct current voltage or, more generally, in the form of pulses. The cut-off voltage is applied to the current limiter 22 through a line 46. The limiter 22 comprises a transistor 47 having an emitter connected to the line 46 through a resistor 48. The base voltage of the transistor 47 is determined by a zener diode 49 connected between the base and line 46 and by a biasing resistor 50 connected -between the anode of diode 49 and line 0. The value of the limit is provided by: (V2 - Vbe) / R, end odne V2 is the voltage of the zer.er diode 49, Vbe is the base emitter voltage of the transistor 47 and R is the value of the resistor 48. The output of the current limiter is made in the co-reader of the transistor 47. The limited current flows through d of a diode 51 and is then added to the current of the transformers in line 12. A resistor 52 connected between the collector of transistor 47 and line 46 enables the regulation of the vot of line 10 to be triggered and facilitated when the supply pipe is provided by circuit 17 only. The control circuit 20 comprises the comparator 23 and the control transistor 58. The investment entry. The comparator is connected to a common point of a resistive divider bridge formed by two resistors 53 and 54. The resistor 53 is connected between the common point and the line 10, and the resistor 54 is connected between the line 0 and the common point . A capacitor 55 is connected to the terminals of the resistor 54 to filter the vortex of the dividing punch. The resistor divider bridge 53, 54, supplies a reference voltage to the reversing input of the comparator 23. The non-inverting input of the comparator 23 is connected to the output of the limiter 22, that is, to the collector of the transistor 47. The output of the gauge 23 is connected to the control gate of the transistor 58 by means of a resistor 56. A bias resistor 57 is connected between the gate and the source of the transistor 52. When the transistor 15 is disconnected, the voltage - of line 12 is at a high value, the non-inverting input of comparator 23 at a voltage greater than the reference voltage applied to its reversing input and the comparator 23 does not -order to connection of transistor 58. The current limiter 22 then supplies a current that is added to the current of the transformer TI. If the voltage of line 12 increases, comparator 21 orders the connection of transistor 15. The input voltage of non-inverter of comparator 23 becomes lower than the reference voltage applied to its reversing input. The output of the comparator 23 then commands the connection of the transistor 58 that short circuits the zener diode 49. The transistor 47 is then disconnected and the current limiter only supplies a very low current flowing in the resistor 52. The percussion device in accordance with the invention generally comprises current transformers with magnetic circuits that supply both co-measurement signals. current as the supply of electric power. In other embodiments, the percussion device according to the invention may comprise air transformers, of the Rogowski toroidal type, for measuring the current and the magnetic circuit transformers for the supply of electrical energy. In the above-described quantities, a single power supply line 10 supplies the circuits of the percussion device, but it is possible to achieve percussion devices according to the invention. that comrpenden diverse energy supply lines designed for various circuits and have different voltages.

Claims

1. - An electronic percussion device for a circuit breaker comprising: - at least one current sensor that supplies a secondary current representative of a current flowing in a conductor of an energy system protected by the circuit breaker. - a processing unit which receives signals representative of currents flowing in conductors of the energy system protected by the circuit breaker, and which supplies a percussion order, a first power supply comprising an input connected to the current sensor, a output connected to a power supply unit that supplies electrical and electronic circuits of the percussion device, a first regulator element connected between the input and the output of the first power supply circuit, and a second power supply circuit that co- - comprises an input connected to a source of electrical energy e_x terna and an output connected to the power supply line, the percussion device characterized in that comprises second regulatory elements comprising an input connected to the output of the Second power supply circuit, one output connected to the power supply line With a control element connected to the first regulating regulating element, the control element controls the second guide element to reduce the average current supplied by the follow-up of the power supply circuit when the current supplied by the current sensor increases. .

2. The percussion device according to claim 1, characterized in that the second regulating element comprises current limiting elements connected between the input and the output of the regulating element, the current measuring elements 1 being controlled by the control element.

3. The percussion device according to claims 1 and 2, characterized in that the first regulator element comprises a first cutter regulator, the second regulator element comprises a second cutter regulator, and the control element comprises synchronization elements connects two between the first and second cutter regulators.

4. The percussion device according to claim 3, characterized in that: the first cutter regulator comprises a current deflection element connected to the input of the first regulating element and first detection element connected between the supply line of energy and the deflection element, the sensing element ordering the short circuit of the input of the first regulating element when the voltage of the power supply line exceeds a first preset threshold, and the second regulating regulator comprises elements of current interruption controlled by the control element, the control element ordering the interruption of the current supplied by the second regulator when the first regulator-element orders short-circuit of the input of the first -regulator element.

5. The percussion device according to any of claims 1 to 4, characterized in that the output of the second regulating element is connected to the input of the first regulating element.

6. The percussion device according to any of claims 1 to 4, characterized in that the output of the second regulating element is connected to the output of the first regulating element.

7. The percussion device of coformidity with any of the claims 1 to 6, characterized in that the second power supply circuit comprises a rectifier-circuit connected to the external electric power source, a voltage limiter connected to the rectifier circuit outputs and, a cutter coencted to the outputs of the limiter and which supplies a voltage to an input of the second regulator element.

8. The percussion device according to claim 7characterized in that the cutter comprises a transformer comprising a primary winding supplied by means of an oscillator and a secondary winding 1 electrically insulated from the primary winding and connected to the input of the second regulating element.

9. The percussion device according to claim 8, characterized in that the cutter is of the return type.