Distribution network feeder terminal opening and closing operation loop current detection circuit

Abstract

The utility model discloses a distribution network feeder terminal opening and closing operation loop current detection circuit, and relates to the technical field of opening and closing motion detection. Comprising a Hall current sensor U2, a secondary resistor R6, a secondary capacitor C6 and a TVS tube D4. When the output value of the Hall current sensor is a positive value, the output value of the Hall current sensor is a current sampling value of a closing operation loop; when the output value of the Hall current sensor is a negative value, the output value of the Hall current sensor is an opening operation loop current sampling value; the Hall current sensor outputs to the AD chip to complete current sampling; in order to improve the design reliability and prevent mixing of opening and closing operation loops, a closing position remote signaling input circuit and a separating position remote signaling input circuit are specially added; the utility model provides a simple switching-on and switching-off action current sampling loop, only one Hall current sensor is used for sampling, the cost is saved, and the design reliability is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of switching on and off action detection, and particularly relates to a distribution network feeder terminal switching on and off operation loop current detection circuit. BACKGROUND

[0002] In the latest published power distribution automation terminal standardization design scheme, the distribution network feeder terminal is required to have a switching on and off action recording wave function, and the operation loop voltage and current waveforms during the switching on and off action recording can be recorded.

[0003] Patent (CN102590739B) discloses a power switch cabinet circuit breaker switching on and off cycle online detection device and a detection method thereof, which solves the problems of existing online detection devices and methods, such as large randomness of measurement, unreasonable signal processing, and inaccurate detection results. The device includes a Hall current sensor, a switching off coil, a switching on coil, a Hall current sensor output conditioning circuit, a high-frequency signal coupling circuit, a high-frequency signal decoupling circuit, a microprocessor, an audible and visual alarm unit, and a communication unit. High-frequency signals are coupled at one end of the three-phase moving and stationary contacts of the circuit breaker main loop, and high-frequency signals are decoupled at the other end of the corresponding phase. After being processed by a power switch cabinet circuit breaker switching on and off cycle online detection program stored in the microprocessor, switching on and off cycle online detection is realized, and three-phase asynchronous online detection of the circuit breaker can be realized. The original device structure does not need to be changed when the high-voltage cabinet circuit breaker is detected, and the performance of the high-voltage switch cabinet is not affected.

[0004] Patent (CN220692822U) discloses a magnetic control switch switching on and off current monitoring protection control system, which includes a switching off unit, a switching on unit, a detection unit, an AD conversion circuit, an MCU circuit, a control switch circuit, and a protection switch. The input end of the protection switch is connected with the switching on coil and the tripping coil, so that the protection circuit is connected in series to the switching on and off coil loop. The detection unit includes a temperature sensor, a smoke sensor, and a voltage and current sensing unit. The voltage and current sensing unit is used to collect voltage and current signals during switching on and off operation in real time. The signals are transmitted to the MCU circuit through the AD conversion circuit. The MCU circuit generates a logic control signal based on the detected signals, and sends the logic control signal to the control switch circuit through wireless or wired means. The utility model can solve the safety hazards existing in the prior art, control the size of the switching on and off current, control the size of the driving current during switching on, and ensure stable, fast, and safe switching on and off.

[0005] The above two patent documents are the same as the traditional design, that is, the switching on operation loop and the switching off operation loop are respectively sampled by the Hall current sensor, so that two Hall current sensors need to work, which is high in cost. UTILITY MODEL CONTENTS

[0006] The utility model discloses a network distribution feeder terminal switching operation loop current detection circuit, to solve the problem of above -mentioned background art.

[0007] In order to solve above -mentioned technical problem, the utility model provides the following technical scheme:

[0008] A network distribution feeder terminal switching operation loop current detection circuit, including hall current sensor U2, vice edge resistance R6, vice edge capacitance C6 and TVS pipe D4,

[0009] The VCC port of hall current sensor U2 is externally connected with VCC_5V end, the OUT port of hall current sensor U2, vice edge capacitance C6 and the GND port of hall current sensor U2 are connected in series in proper order, and the wiring between vice edge capacitance C6 and the GND port of hall current sensor U2 is grounded.

[0010] Vice edge capacitance C6 and TVS pipe D4 are connected in parallel with vice edge capacitance C6, and vice edge capacitance C6 and TVS pipe D4 are connected in parallel.

[0011] Preferably, it further includes remote signaling input circuit, and the remote signaling input circuit includes on-position remote signaling input circuit and off-position remote signaling input circuit.

[0012] Preferably, the on-position remote signaling input circuit includes piezoresistance RV7, resistance R466, resistance R613, voltage stabilizing diode D34, capacitance C261, diode D35 and linear photoelectric coupler U46.

[0013] The on-position signal input end HW, resistance R466, voltage stabilizing diode D34, the 1 interface of linear photoelectric coupler U46, the 2 interface of linear photoelectric coupler U46 and remote signaling signal F end are connected in series in proper order.

[0014] The piezoresistance RV7 is externally connected between the on-position signal input end HW and resistance R466, the resistance R613 is externally connected between the resistance R466 and voltage stabilizing diode D34, the capacitance C261 and diode D35 are externally connected between the voltage stabilizing diode D34 and the 1 interface of linear photoelectric coupler U46, and the piezoresistance RV7, resistance R613, capacitance C261 and diode D35 are electrically connected between the 2 interface of linear photoelectric coupler U46 and remote signaling signal F end respectively.

[0015] The 4 interface of linear photoelectric coupler U46 is externally connected with VCC_5V end, and the 3 interface of linear photoelectric coupler U46 is externally connected with remote signaling signal YX_HW end.

[0016] Preferably, the on-position remote signaling input circuit further includes vice edge resistance R467 and vice edge capacitance C263.

[0017] The secondary resistance R467 and the secondary capacitor C263 are electrically connected with the 3 interface of the linear photoelectric coupler U46, the secondary resistance R467 and the secondary capacitor C263 are connected in parallel, and the connection line of the secondary resistance R467 and the secondary capacitor C263 is grounded.

[0018] Preferably, the sub-position remote signaling input circuit comprises a pressure-sensitive resistor RV6, a resistor R461, a resistor R607, a voltage stabilizing diode D32, a capacitor C535, a diode D57, and a linear photoelectric coupler U45.

[0019] The sub-position signal input end FW, the resistor R461, the voltage stabilizing diode D32, the 1 interface of the linear photoelectric coupler U45, the 2 interface of the linear photoelectric coupler U45, and the remote signaling signal F end are sequentially connected in series.

[0020] The pressure-sensitive resistor RV6 is externally connected between the sub-position signal input end FW and the resistor R461, the resistor R607 is externally connected between the resistor R461 and the voltage stabilizing diode D32, the capacitor C535 and the diode D57 are externally connected between the voltage stabilizing diode D32 and the 1 interface of the linear photoelectric coupler U45, and the pressure-sensitive resistor RV6, the resistor R607, the capacitor C535, and the diode D57 are respectively electrically connected between the 2 interface of the linear photoelectric coupler U45 and the remote signaling signal F end.

[0021] The 4 interface of the linear photoelectric coupler U45 is externally connected with the VCC_5V end, and the 3 interface of the linear photoelectric coupler U45 is externally connected with the remote signaling signal YX_FW end.

[0022] Preferably, the sub-position remote signaling input circuit further comprises a secondary resistance R612 and a secondary capacitor C537.

[0023] The secondary resistance R612 and the secondary capacitor C537 are electrically connected with the 3 interface of the linear photoelectric coupler U45, the secondary resistance R612 and the secondary capacitor C537 are connected in parallel, and the connection line of the secondary resistance R612 and the secondary capacitor C537 is grounded.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] The utility model discloses a part of circuit is the closing and opening operation loop current sampling circuit, is composed of hall current sensor U2, secondary resistance R6, secondary capacitor C6 and TVS pipe D4, one part is the telesignalling circuit, wherein the closing telesignalling circuit is composed of piezoresistance RV7, resistance R466, resistance R613, voltage stabilizing diode D34, capacitor C261, diode D35, linear photoelectric coupler U46, secondary resistance R467 and secondary capacitor C263, and the opening telesignalling circuit is designed completely same with the closing telesignalling circuit, when the hall current sensor output value is positive, the hall current sensor output is closing operation loop current sampling value, when the hall current sensor output value is negative, the hall current sensor output is opening operation loop current sampling value, the hall current sensor output is to AD chip, and completes current sampling, in order to improve the design reliability, and prevent the closing and opening operation loop confusion, and specially increase the closing telesignalling circuit and the opening telesignalling circuit, the utility model provides a simple closing and opening action current sampling loop, only uses a hall current sensor sampling, saves the cost, and guarantees the reliability of design. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0027] Figure 1 It is the detection circuit schematic view of the utility model,

[0028] Figure 2 It is the circuit schematic view of the closing telesignalling circuit of the utility model,

[0029] Figure 3 It is the circuit schematic view of the opening telesignalling circuit of the utility model. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and apparently, the described embodiments only are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belong to the range of the utility model protection.

[0031] As Figures 1-3The utility model provides technical schemes: a distribution network feeder terminal switching operation loop current detection circuit, including hall current sensor U2, secondary resistance R6, secondary capacitor C6 and TVS pipe D4, the VCC port of hall current sensor U2 is connected with VCC_5V end, the OUT port of hall current sensor U2, secondary capacitor C6 and the GND port of hall current sensor U2 are in series in proper order, the wiring between secondary capacitor C6 and the GND port of hall current sensor U2 is handled to ground connection, secondary capacitor C6 and TVS pipe D4 are parallel with secondary capacitor C6, and secondary capacitor C6 and TVS pipe D4 are parallel.

[0032] In one embodiment, further comprising a remote signaling input circuit, the remote signaling input circuit comprising a close remote signaling input circuit and an open remote signaling input circuit.

[0033] In one embodiment, as Figure 2As shown, the joint bit telesign incoming circuit includes a pressure sensitive resistor RV7, a resistor R466, a resistor R613, a voltage stabilizing diode D34, a capacitor C261, a diode D35, a linear optical coupling U46, a secondary side resistor R467 and a secondary side capacitor C263; the joint bit signal input end HW, the resistor R466, the voltage stabilizing diode D34, the 1 interface of the linear optical coupling U46, the 2 interface of the linear optical coupling U46 and the telesign signal F end are connected in series; the pressure sensitive resistor RV7 is connected in parallel between the joint bit signal input end HW and the resistor R466, the resistor R613 is connected in parallel between the resistor R466 and the voltage stabilizing diode D34, the capacitor C261 and the diode D35 are connected in parallel between the voltage stabilizing diode D34 and the 1 interface of the linear optical coupling U46, the pressure sensitive resistor RV7, the resistor R613, the capacitor C261 and the diode D35 are electrically connected between the 2 interface of the linear optical coupling U46 and the telesign signal F end respectively; the 4 interface of the linear optical coupling U46 is connected with the VCC_5V end, the 3 interface of the linear optical coupling U46 is connected with the telesign signal YX_HW end; the secondary side resistor R467 and the secondary side capacitor C263 are electrically connected with the 3 interface of the linear optical coupling U46, the secondary side resistor R467 and the secondary side capacitor C263 are connected in parallel, and the connection line of the secondary side resistor R467 and the secondary side capacitor C263 is grounded; the voltage stabilizing diode D34 stabilizes the voltage in the joint bit telesign incoming circuit, the pressure sensitive resistor RV7 is used for discharging the surge interference introduced by the telesign, and the telesign loop is protected from being damaged; the diode D35 can clamp the reverse input voltage and protect the optical coupling; the resistor R613 is used as a voltage dividing resistor, can provide a telesign voltage input threshold, and prevent small voltage interference from causing telesign malfunction; the pressure sensitive resistor RV7 plays a role in absorbing surge voltage; the capacitor C261 is used to absorb high-frequency interference signals, and the resistor R466 is used as a current limiting resistor and connected in series in the loop to limit the current; in addition to current limiting, the resistor R466 and the capacitor C261 can also form an RC filter circuit to further absorb interference; the secondary side resistor R467 can improve the anti-interference performance of the optical coupling and prevent the optical coupling from being misdirected due to small current in the environment; the secondary side capacitor C263 can absorb high-frequency noise in the signal, making the signal smoother, and can also absorb interference pulses.

[0034] In one embodiment, as Figure 3As shown, the sub-position remote signaling input circuit comprises a pressure-sensitive resistor RV6, a resistor R461, a resistor R607, a voltage stabilizing diode D32, a capacitor C535, a diode D57, a linear optical coupler U45, a secondary side resistor R612 and a secondary side capacitor C537; a sub-position signal input end FW, the resistor R461, the voltage stabilizing diode D32, a 1 interface of the linear optical coupler U45, a 2 interface of the linear optical coupler U45 and a remote signaling signal F end are connected in series; the pressure-sensitive resistor RV6 is connected between the sub-position signal input end FW and the resistor R461, the resistor R607 is connected between the resistor R461 and the voltage stabilizing diode D32, the capacitor C535 and the diode D57 are connected between the voltage stabilizing diode D32 and the 1 interface of the linear optical coupler U45, and the pressure-sensitive resistor RV6, the resistor R607, the capacitor C535 and the diode D57 are respectively connected between the 2 interface of the linear optical coupler U45 and the remote signaling signal F end; a 4 interface of the linear optical coupler U45 is connected with a VCC_5V end, and a 3 interface of the linear optical coupler U45 is connected with a remote signaling signal YX_FW end; the secondary side resistor R612 and the secondary side capacitor C537 are electrically connected with the 3 interface of the linear optical coupler U45, the secondary side resistor R612 and the secondary side capacitor C537 are connected in parallel, and the connection line of the secondary side resistor R612 and the secondary side capacitor C537 is grounded, and the roles of the components in the sub-position remote signaling input circuit are the same as those in the combined-position remote signaling input circuit.

[0035] Specific working principle:

[0036] Part of the circuit in the utility model is a closing operation loop current sampling circuit composed of a Hall current sensor U2, a secondary side resistor R6, a secondary side capacitor C6 and a TVS tube D4; part of the circuit is a remote signaling input circuit, wherein the combined-position remote signaling input circuit is composed of a pressure-sensitive resistor RV7, a resistor R466, a resistor R613, a voltage stabilizing diode D34, a capacitor C261, a diode D35, a linear optical coupler U46, a secondary side resistor R467 and a secondary side capacitor C263, and the sub-position remote signaling input circuit is designed in the same way as the combined-position remote signaling input circuit.

[0037] The closing operation loop and the opening operation loop are respectively connected into the Hall current sensor in different directions, for example Figure 1 As shown, when the Hall current sensor output value is positive, the Hall current sensor output is the closing operation loop current sampling value; when the Hall current sensor output value is negative, the Hall current sensor output is the opening operation loop current sampling value; the Hall current sensor output is connected to an AD chip, and current sampling is completed.

[0038] In order to improve the design reliability, and prevent the closing and opening operation circuit confusion, the closing bit remote signaling input circuit and the opening bit remote signaling input circuit are specially increased; when the opening action, the switch closing bit remote signaling is set to 0, the switch opening bit remote signaling is set to 1, and the output value in the Hall coil is the opening current; when the closing action, the switch closing bit remote signaling is set to 1, the switch opening bit remote signaling is set to 0, and the output value in the Hall coil is the closing current.

[0039] The utility model provides a simple closing and opening action current sampling circuit, only uses a Hall current sensor sampling, has saved the cost, and has guaranteed the reliability of design.

[0040] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be contained in the protection scope of the utility model.

Claims

1. A distribution network feeder terminal switching operation loop current detection circuit, comprising a Hall current sensor U2, a secondary side resistor R6, a secondary side capacitor C6 and a TVS tube D4, characterized in that: the VCC port of the Hall current sensor U2 is externally connected to a VCC_5V terminal, the OUT port of the Hall current sensor U2, the secondary side capacitor C6 and the GND port of the Hall current sensor U2 are connected in series, and the connection between the secondary side capacitor C6 and the GND port of the Hall current sensor U2 is grounded. The secondary side capacitor C6 and the TVS tube D4 are connected in parallel with the secondary side capacitor C6, and the secondary side capacitor C6 and the TVS tube D4 are connected in parallel.

2. The distribution network feeder terminal switching operation loop current detection circuit according to claim 1, characterized in that: it further comprises a remote signaling input circuit, and the remote signaling input circuit comprises a close position remote signaling input circuit and an open position remote signaling input circuit.

3. The distribution network feeder terminal switching operation loop current detection circuit according to claim 2, characterized in that: the close position remote signaling input circuit comprises a pressure-sensitive resistor RV7, a resistor R466, a resistor R613, a voltage stabilizing diode D34, a capacitor C261, a diode D35 and a linear optocoupler U46. The close position signal input terminal HW, the resistor R466, the voltage stabilizing diode D34, the 1 interface of the linear optocoupler U46, the 2 interface of the linear optocoupler U46 and the remote signaling signal F terminal are connected in series. The pressure-sensitive resistor RV7 is externally connected between the close position signal input terminal HW and the resistor R466, the resistor R613 is externally connected between the resistor R466 and the voltage stabilizing diode D34, the capacitor C261 and the diode D35 are externally connected between the voltage stabilizing diode D34 and the 1 interface of the linear optocoupler U46, and the pressure-sensitive resistor RV7, the resistor R613, the capacitor C261 and the diode D35 are respectively electrically connected between the 2 interface of the linear optocoupler U46 and the remote signaling signal F terminal. The 4 interface of the linear optocoupler U46 is externally connected to a VCC_5V terminal, and the 3 interface of the linear optocoupler U46 is externally connected to a remote signaling signal YX_HW terminal.

4. The distribution network feeder terminal switching operation loop current detection circuit according to claim 3, characterized in that: the close position remote signaling input circuit further comprises a secondary side resistor R467 and a secondary side capacitor C263. The secondary side resistor R467 and the secondary side capacitor C263 are both electrically connected to the 3 interface of the linear optocoupler U46, the secondary side resistor R467 and the secondary side capacitor C263 are connected in parallel, and the connection of the secondary side resistor R467 and the secondary side capacitor C263 is grounded.

5. The distribution network feeder terminal switching operation loop current detection circuit according to claim 2, characterized in that: the open position remote signaling input circuit comprises a pressure-sensitive resistor RV6, a resistor R461, a resistor R607, a voltage stabilizing diode D32, a capacitor C535, a diode D57 and a linear optocoupler U45. The open position signal input terminal FW, the resistor R461, the voltage stabilizing diode D32, the 1 interface of the linear optocoupler U45, the 2 interface of the linear optocoupler U45 and the remote signaling signal F terminal are connected in series. ​ ​ ​ ​ ​ The voltage-dependent resistor RV6 is connected between the quantile signal input end FW and the resistor R461, the resistor R607 is connected between the resistor R461 and the voltage stabilizing diode D32, the capacitor C535 and the diode D57 are connected between the voltage stabilizing diode D32 and the 1 interface of the linear photoelectric coupler U45, and the voltage-dependent resistor RV6, the resistor R607, the capacitor C535 and the diode D57 are respectively connected between the 2 interface of the linear photoelectric coupler U45 and the remote signal F end. The 4 interface of the linear photoelectric coupler U45 is connected with the VCC_5V end, and the 3 interface of the linear photoelectric coupler U45 is connected with the remote signal YX_FW end.

6. The circuit according to claim 5, wherein the circuit is characterized in that: The remote signal input circuit further comprises a secondary resistor R612 and a secondary capacitor C537. The secondary resistor R612 and the secondary capacitor C537 are both connected with the 3 interface of the linear photoelectric coupler U45, the secondary resistor R612 and the secondary capacitor C537 are connected in parallel, and the connection lines of the secondary resistor R612 and the secondary capacitor C537 are grounded.

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