Circuit breaker full life cycle monitoring device

Abstract

The invention discloses a circuit breaker full life cycle monitoring device, which belongs to the field of power distribution networks and comprises an MCU module, a control relay, an operation loop ADC, a GPS module, an operation loop current sensor, a real-time clock, an audio ADC, a network interface, an SDNAND module and a microphone. Under the condition that the structure of the secondary equipment of the power distribution switch is not changed, the device is additionally arranged, the action state of the power distribution switch can be detected, and when it is detected that the switch does not act according to a command of the secondary equipment, supplementary action operation is executed; aiming at the situation that old switch equipment does not monitor the switch action condition and pre-judge the switch performance and the service life, the switch action is unsuccessful, the fault isolation is failed and the fault range of a power distribution network is expanded, the device is additionally arranged, so that the action state of the power distribution switch can be detected; and when it is detected that the switch does not act according to the command of the secondary equipment, the complementary operation is executed.

Description

Technical Field

[0001] The present invention belongs to the field of distribution networks, and particularly relates to a monitoring device for the whole life cycle of a circuit breaker. Background Art

[0002] A circuit breaker is an important protection device in the power system, and its operating state is directly related to the safety and stability of the power grid. Traditional circuit breaker monitoring methods usually rely on regular maintenance and post-fault analysis, and cannot achieve real-time monitoring and predictive maintenance.

[0003] The current drawbacks should be technical drawbacks, such as high cost, high energy consumption, slow response speed and other similar problems. In old distribution switch equipment, the secondary unit only issues switch opening and closing control commands, without monitoring the switch action situation and predicting the switch performance and life, resulting in unsuccessful switch actions, failure of fault isolation, and expansion of the distribution network fault range.

[0004] With the development of smart grids, the demand for monitoring the whole life cycle of circuit breakers is increasing day by day. There is an urgent need for a device that can monitor the state of circuit breakers in real time and predict their life. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a monitoring device for the whole life cycle of a circuit breaker in view of the deficiencies of the background art. By installing this device without changing the structure of the secondary equipment of the distribution switch, the action state detection of the distribution switch can be realized. When it is detected that the switch does not act according to the command of the secondary equipment, a supplementary action operation is executed. This device uses functions such as voiceprint detection, opening and closing coil voltage and current detection to predict the switch performance and life, and effectively improves the success rate of switch actions.

[0006] The present invention adopts the following technical solutions to solve the above technical problems: A monitoring device for the whole life cycle of a circuit breaker includes an MCU module, a control relay, an operation loop ADC, a GPS module, an operation loop current sensor, a real-time clock, an audio ADC, a network interface, an SDNAND module, and a microphone; the microphone is connected to the MCU module through the audio ADC, the SDNAND module, the network interface, the real-time clock, the GPS module, and the control relay are respectively connected to the MCU module, and the MCU module is connected to the operation loop current sensor through the operation loop ADC; The MCU module is used to realize real-time recording of the voltage and current of the opening and closing and energy storage circuits and switch action monitoring through the operation loop current sensor and the operation loop ADC; The real-time clock is used to provide time information for the recorded wave data and action events as time stamps; The GPS module is used to provide a time synchronization time stamp to calibrate the time of the real-time clock; An audio ADC is used to collect the sound of switch actions for switch voiceprint analysis; A network interface is used for parameter setting and firmware update; An SDNAND module is used to store waveform recordings and action events; A microphone is used to input the switch sound signal.

[0007] As a further preferred solution of a circuit breaker full - life - cycle monitoring device of the present invention, it is characterized in that: it further includes a switch sound signal conditioning circuit, and the microphone is connected to the audio ADC through the switch sound signal conditioning circuit.

[0008] As a further preferred solution of a circuit breaker full - life - cycle monitoring device of the present invention, the switch sound signal conditioning circuit includes a resistor R72, a resistor R73, a resistor R74, a resistor R75, a resistor R81, a resistor R84, capacitors C92, C93, C94, C100, C152, C153, a terminal JP3, operational amplifiers A74A and A74B, a PGND terminal, an ADC2 - INL terminal and a 5V voltage terminal. The PGND terminal is respectively connected to one end of capacitor C152 and one end of capacitor C153 and grounded. The other end of capacitor C152 is respectively connected to the other end of capacitor C153 and the 5V voltage terminal. Pin 1 of terminal JP3 is respectively connected to one end of resistor R75 and one end of capacitor C94. Pin 2 of terminal JP3 is respectively connected to one end of resistor R73, the other end of resistor R75, the other end of capacitor C94 and one end of capacitor C93. The other end of resistor R73 is connected to the 5V voltage terminal. The other end of capacitor C93 is connected to one end of resistor R74. The other end of resistor R74 is respectively connected to one end of resistor R72, one end of capacitor C92 and pin 2 of operational amplifier A74A. The other end of resistor R72 is respectively connected to the other end of capacitor C92, pin 1 of operational amplifier A74A and the DC2 - INL terminal. Pin 4 of operational amplifier A74A is grounded. Pin 8 of operational amplifier A74A is connected to the 5V voltage terminal. Pin 3 of operational amplifier A74A is respectively connected to pin 6 and pin 7 of operational amplifier A74B. Pin 5 of operational amplifier A74B is respectively connected to one end of resistor R81, one end of resistor R84 and one end of capacitor C100. The other end of resistor R81 is connected to the 5V voltage terminal. The other end of resistor R84 is connected to the other end of capacitor C100 and grounded.

[0009] As a further preferred solution of a circuit breaker full - life - cycle monitoring device of the present invention, the chip model of the operational amplifier A74A is RS8412.

[0010] As a further preferred embodiment of the monitoring device for the whole life cycle of a circuit breaker according to the present invention, the chip model of the operational amplifier A74B is RS8412.

[0011] As a further preferred embodiment of the monitoring device for the whole life cycle of a circuit breaker according to the present invention, the resistance value of the resistor R72 is 51 kΩ.

[0012] As a further preferred embodiment of the monitoring device for the whole life cycle of a circuit breaker according to the present invention, the audio ADC includes a chip U12, capacitors C57, C58, C59, C60, C61, C53, C54, resistors R60, R61, a variable resistor RP6, a 3.3V voltage terminal, a 5V voltage terminal, an ADC2-INL terminal, and a PGND terminal; wherein, the 3.3V voltage terminal is respectively connected to pins 1, 2, 3, and 4 of the variable resistor RP6, the pin 5 of the variable resistor RP6 is connected to the pin 8 of the chip U12, the pin 6 of the variable resistor RP6 is connected to the pin 9 of the chip U12, the pin 7 of the variable resistor RP6 is connected to the pin 7 of the chip U12, the pin 8 of the variable resistor RP6 is connected to the pin 6 of the chip U12, one end of the capacitor C57 is connected to the pin 1 of the chip U12, and the other end of the capacitor C57 is respectively connected to the pins 2 and 5 of the chip U12. The pin 3 of the chip U12 is respectively connected to the 5V voltage terminal, one end of the capacitor C59, and one end of the capacitor C60. The other end of the capacitor C60 is respectively connected to the other end of the capacitor C59, one end of the capacitor C61, one end of the capacitor C58, and the PGND terminal. The other end of the capacitor C58 is respectively connected to the other end of the capacitor C61, the 3.3V voltage terminal, and the pin 4 of the chip U12. The pins 10, 11, and 12 of the chip U12 are respectively connected to one end of the capacitors C55 and C56. The other end of the capacitor C55 is respectively connected to the pin 14 of the chip U12 and one end of the resistor R60. The other end of the capacitor C56 is respectively connected to the pin 13 of the chip U12 and one end of the resistor R61. The other end of the resistor R60 is connected to one end of the capacitor C53, and the other end of the capacitor C53 is respectively connected to one end of the capacitor C54 and the ADC2-INL terminal.

[0013] As a further preferred embodiment of the monitoring device for the whole life cycle of a circuit breaker according to the present invention, the chip model of the variable resistor RP6 is 0603 - RPM.

[0014] As a further preferred embodiment of the monitoring device for the whole life cycle of a circuit breaker according to the present invention, the chip model of the chip U12 is MS1808.

[0015] Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects: A monitoring device for the whole life cycle of a circuit breaker. Without modifying the structure of the secondary equipment of the distribution switch, installing this device can realize the detection of the action state of the distribution switch. When it is detected that the switch fails to act according to the command of the secondary equipment, a supplementary action operation is executed. This device utilizes functions such as voiceprint detection, voltage and current detection of the closing and opening coils, and can predict the performance and life of the switch; effectively improve the success rate of switch actions. For old switch equipment, there is no monitoring of the switch action situation and prediction of the switch performance and life, resulting in unsuccessful switch actions, failure of fault isolation, and expansion of the fault range of the distribution network. Installing this device can realize the detection of the action state of the distribution switch. When it is detected that the switch fails to act according to the command of the secondary equipment, a supplementary action operation is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the structural schematic diagram of a monitoring device for the whole life cycle of a circuit breaker of the present invention; Figure 2 is the circuit diagram of the switch sound signal conditioning circuit of the present invention; Figure 3 is the circuit diagram of the audio ADC of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings: The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The present invention will be described in detail below according to the drawings and preferred embodiments, and the purpose and effect of the present invention will become more apparent. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] A monitoring device for the whole life cycle of a circuit breaker, as Figure 1 shown, includes an MCU module, a control relay, an operating circuit ADC, a GPS module, Operating circuit current sensor, real-time clock, audio ADC, network interface, SDNAND module, microphone; the microphone is connected to the MCU module through the audio ADC, the SDNAND module, network interface, real-time clock, GPS module, and control relay are respectively connected to the MCU module, and the MCU module is connected to the operating circuit current sensor through the operating circuit ADC; the main control MCU module realizes real-time recording of the voltage and current of the closing and opening, energy storage circuits and switch action monitoring through the operating circuit current sensor and the operating circuit ADC. The time information of the real-time clock is provided to the recorded wave data and action events as time stamps, the GPS provides a time synchronization time stamp to calibrate the time of the real-time clock, the audio ADC collects the switch action sound for switch voiceprint analysis, the network interface is used for parameter setting and firmware update, and the SDNAND is used for storing the recorded wave and action events.

[0019] Without changing the structure of the secondary equipment of the distribution switch, this device is installed to realize the detection of the action state of the distribution switch. When it is detected that the switch does not act according to the command of the secondary equipment, a supplementary action operation is executed. This device utilizes the functions of voiceprint detection, closing and opening coil voltage and current detection to predict the performance and life of the switch; effectively improves the success rate of switch action. For old switch equipment, there is no monitoring of the switch action situation and prediction of the switch performance and life, resulting in unsuccessful switch actions, failure of fault isolation, and expansion of the distribution network fault range. Installing this device can realize the detection of the action state of the distribution switch. When it is detected that the switch does not act according to the command of the secondary equipment, a supplementary action operation is executed.

[0020] The MCU module is used to realize real-time recording of the voltage and current of the closing and opening, energy storage circuits and switch action monitoring through the operating circuit current sensor and the operating circuit ADC; The real-time clock is used to provide time information to the recorded wave data and action events as time stamps; The GPS module is used to provide a time synchronization time stamp to calibrate the time of the real-time clock; The audio ADC is used to collect the switch action sound for switch voiceprint analysis; The network interface is used for parameter setting and firmware update; The SDNAND module is used to store the recorded wave and action events; The microphone is used to input the switch sound signal.

[0021] As a further preferred scheme of a circuit breaker full life cycle monitoring device of the present invention, it is characterized in that: it further includes a switch sound signal conditioning circuit, and the microphone is connected to the audio ADC through the switch sound signal conditioning circuit.

[0022] Such as Figure 2As shown, the switch sound signal conditioning circuit includes resistor R72, resistor R73, resistor R74, resistor R75, resistor R81, resistor R84, capacitor C92, capacitor C93, capacitor C94, capacitor C100, capacitor C152, capacitor C153, terminal JP3, operational amplifier A74A, operational amplifier A74B, PGND terminal, ADC2 - INL terminal and 5V voltage terminal. The PGND terminal is respectively connected to one end of capacitor C152 and one end of capacitor C153 and grounded. The other end of capacitor C152 is respectively connected to the other end of capacitor C153 and the 5V voltage terminal. Pin 1 of terminal JP3 is respectively connected to one end of resistor R75 and one end of capacitor C94. Pin 2 of terminal JP3 is respectively connected to one end of resistor R73, the other end of resistor R75, the other end of capacitor C94 and one end of capacitor C93. The other end of resistor R73 is connected to the 5V voltage terminal. The other end of capacitor C93 is connected to one end of resistor R74. The other end of resistor R74 is respectively connected to one end of resistor R72, one end of capacitor C92 and pin 2 of operational amplifier A74A. The other end of resistor R72 is respectively connected to the other end of capacitor C92, pin 1 of operational amplifier A74A and the DC2 - INL terminal. Pin 4 of operational amplifier A74A is grounded. Pin 8 of operational amplifier A74A is connected to the 5V voltage terminal. Pin 3 of operational amplifier A74A is respectively connected to pin 6 and pin 7 of operational amplifier A74B. Pin 5 of operational amplifier A74B is respectively connected to one end of resistor R81, one end of resistor R84 and one end of capacitor C100. The other end of resistor R81 is connected to the 5V voltage terminal. The other end of resistor R84 is connected to the other end of capacitor C100 and grounded.

[0023] Preferably, the chip model of the operational amplifier A74A is RS8412, the chip model of the operational amplifier A74B is RS8412, and the resistance value of the resistor R72 is 51K ohms.

[0024] As Figure 3As shown, the audio ADC includes chip U12, capacitor C57, capacitor C58, capacitor C59, capacitor C60, capacitor C61, capacitor C53, capacitor C54, resistor R60, resistor R61, adjustable resistor RP6, 3.3V voltage terminal, 5V voltage terminal, ADC2-INL terminal, and PGND terminal; among them, the 3.3V voltage terminal is respectively connected to pin 1, pin 2, pin 3, and pin 4 of the adjustable resistor RP6, pin 5 of the adjustable resistor RP6 is connected to pin 8 of chip U12, pin 6 of the adjustable resistor RP6 is connected to pin 9 of chip U12, pin 7 of the adjustable resistor RP6 is connected to pin 7 of chip U12, pin 8 of the adjustable resistor RP6 is connected to pin 6 of chip U12, pin 1 of chip U12 is connected to one end of capacitor C57, the other end of capacitor C57 is respectively connected to pin 2 and pin 5 of chip U12, pin 3 of chip U12 is respectively connected to the 5V voltage terminal, one end of capacitor C59, and one end of capacitor C60, the other end of capacitor C60 is respectively connected to the other end of capacitor C59, one end of capacitor C61, one end of capacitor C58, and the PGND terminal, the other end of capacitor C58 is respectively connected to the other end of capacitor C61, the 3.3V voltage terminal, and pin 4 of chip U12, pin 10, pin 11, and pin 12 of chip U12 are respectively connected to one end of capacitor C55 and one end of capacitor C56, the other end of capacitor C55 is respectively connected to pin 14 of chip U12 and one end of resistor R60, the other end of capacitor C56 is respectively connected to pin 13 of chip U12 and one end of resistor R61, the other end of resistor R60 is connected to one end of capacitor C53, and the other end of capacitor C53 is respectively connected to one end of capacitor C54 and the ADC2-INL terminal.

[0025] The chip model of the adjustable resistor RP6 is 0603-RPM, and the chip model of the chip U12 is MS1808.

[0026] Those of ordinary skill in the art can understand that the above are only preferred examples of the invention and are not used to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, for those skilled in the art, they can still modify the technical solutions described in the foregoing examples or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention. All technical features in this embodiment can be freely combined according to actual needs.

[0027] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A circuit breaker full life cycle monitoring device, characterized in that: It includes an MCU module, a control relay, an operational circuit ADC, a GPS module, an operational circuit current sensor, a real-time clock, an audio ADC, a network interface, an SDNAND module, and a microphone; the microphone is connected to the MCU module through the audio ADC, the SDNAND module, the network interface, the real-time clock, the GPS module, and the control relay are respectively connected to the MCU module, and the MCU module is connected to the operational circuit current sensor through the operational circuit ADC; The MCU module is used to realize real-time recording of the voltage and current of the closing and opening, energy storage circuits and switch action monitoring through the operational circuit current sensor and the operational circuit ADC; The real-time clock is used to provide time information to the recorded wave data and action events as time stamps; The GPS module is used to provide a time synchronization time stamp to calibrate the time of the real-time clock; The audio ADC is used to collect the switch action sound for switch voiceprint analysis; The network interface is used for parameter setting and firmware update; The SDNAND module is used to store the recorded waves and action events; The microphone is used to input the switch sound signal. It further includes a switch sound signal conditioning circuit, and the microphone is connected to the audio ADC through the switch sound signal conditioning circuit.

2. The monitoring device for the full life cycle of a circuit breaker according to claim 1, characterized in that: ： The switch sound signal conditioning circuit includes a resistor R72, a resistor R73, a resistor R74, a resistor R75, a resistor R81, a resistor R84, capacitors C92, C93, C94, C100, C152, C153, a terminal JP3, operational amplifiers A74A, A74B, a PGND terminal, an ADC2-INL terminal, and a 5V voltage terminal. The PGND terminal is respectively connected to one end of capacitor C152 and one end of capacitor C153 and grounded. The other end of capacitor C152 is respectively connected to the other end of capacitor C153 and the 5V voltage terminal. Pin 1 of terminal JP3 is respectively connected to one end of resistor R75 and one end of capacitor C94. Pin 2 of terminal JP3 is respectively connected to one end of resistor R73, the other end of resistor R75, the other end of capacitor C94, and one end of capacitor C93. The other end of resistor R73 is connected to the 5V voltage terminal. The other end of capacitor C93 is connected to one end of resistor R74. The other end of resistor R74 is respectively connected to one end of resistor R72, one end of capacitor C92, and pin 2 of operational amplifier A74A. The other end of resistor R72 is respectively connected to the other end of capacitor C92, pin 1 of operational amplifier A74A, and the DC2-INL terminal. Pin 4 of operational amplifier A74A is grounded. Pin 8 of operational amplifier A74A is connected to the 5V voltage terminal. Pin 3 of operational amplifier A74A is respectively connected to pin 6 and pin 7 of operational amplifier A74B. Pin 5 of operational amplifier A74B is respectively connected to one end of resistor R81, one end of resistor R84, and one end of capacitor C100. The other end of resistor R81 is connected to the 5V voltage terminal. The other end of resistor R84 is connected to the other end of capacitor C100 and grounded.

3. The monitoring device for the full life cycle of a circuit breaker according to claim 2, characterized in that: The chip model of the operational amplifier A74A is RS8412.

4. The monitoring device for the whole life cycle of a circuit breaker according to claim 3, characterized in that: ​ 5. The monitoring device for the full life cycle of a circuit breaker according to claim 3, characterized in that: The chip model of the operational amplifier A74B is RS8412.

6. The monitoring device for the whole life cycle of a circuit breaker according to claim 3, characterized in that: The resistance value of the resistor R72 is 51 kΩ.

7. The monitoring device for the full life cycle of a circuit breaker according to claim 1, characterized in that: The audio ADC includes the chip U12, capacitors C57, C58, C59, C60, C61, C53, C54, resistors R60, R61, adjustable resistor RP6, 3.3V voltage terminal, 5V voltage terminal, ADC2-INL terminal, and PGND terminal; among them, the 3.3V voltage terminal is respectively connected to pins 1, 2, 3, and 4 of the adjustable resistor RP6, the pin 5 of the adjustable resistor RP6 is connected to the pin 8 of the chip U12, the pin 6 of the adjustable resistor RP6 is connected to the pin 9 of the chip U12, the pin 7 of the adjustable resistor RP6 is connected to the pin 7 of the chip U12, the pin 8 of the adjustable resistor RP6 is connected to the pin 6 of the chip U12, the pin 1 of the chip U12 is connected to one end of the capacitor C57, the other end of the capacitor C57 is respectively connected to the pins 2 and 5 of the chip U12, the pin 3 of the chip U12 is respectively connected to the 5V voltage terminal, one end of the capacitor C59, and one end of the capacitor C60, the other end of the capacitor C60 is respectively connected to the other end of the capacitor C59, one end of the capacitor C61, one end of the capacitor C58, and the PGND terminal, the other end of the capacitor C58 is respectively connected to the other end of the capacitor C61, the 3.3V voltage terminal, and the pin 4 of the chip U12, the pins 10, 11, and 12 of the chip U12 are respectively connected to one end of the capacitors C55 and C56, the other end of the capacitor C55 is respectively connected to the pin 14 of the chip U12 and one end of the resistor R60, the other end of the capacitor C56 is respectively connected to the pin 13 of the chip U12 and one end of the resistor R61, the other end of the resistor R60 is connected to one end of the capacitor C53, and the other end of the capacitor C53 is respectively connected to one end of the capacitor C54 and the ADC2-INL terminal.

8. The monitoring device for the full life cycle of a circuit breaker according to claim 7, characterized in that: The chip model of the adjustable resistor RP6 is 0603 - RPM.

9. The monitoring device for the whole life cycle of a circuit breaker according to claim 7, characterized in that: The chip model of the chip U12 is MS1808.

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