CN-121983910-A - Anti-reverse power transmission intelligent circuit breaker integrating voltage and current accurate detection

CN121983910ACN 121983910 ACN121983910 ACN 121983910ACN-121983910-A

Abstract

The invention discloses an integrated voltage and current accurate detection anti-reverse power transmission intelligent circuit breaker, which belongs to the technical field of anti-reverse power transmission and comprises a detection module, a rapid protection channel module, an intelligent load identification module, a dual-channel control architecture module, a communication module and an automatic disconnection assembly, wherein the detection module is used for synchronously collecting voltage signals and current signals on a main circuit of the circuit breaker, the rapid protection channel module is used for amplifying and judging the collected signals in real time and outputting a tripping instruction when overcurrent or reverse power transmission risks are detected, the intelligent load identification module is used for identifying the connected load type and equipment characteristics, the dual-channel control architecture module is used for receiving the signals of the detection module, the communication module is used for uploading state information to a monitoring center, and the automatic disconnection assembly is used for automatically disconnecting the circuit breaker when reverse power transmission occurs. The invention skillfully combines electromagnetic drive and mechanical linkage through the automatic disconnection assembly, has high response speed and reliable action, ensures that the fault information can be uploaded in time even after the breaker trips by taking electricity from the incoming line end through the power line carrier communication, and greatly facilitates operation and maintenance management.

Inventors

WANG SHUANG
ZHENG FENG
CAO JIAXIAN
GUO XUELI
WANG YING
LI TINGTING
YANG BING
YAO NAN
GUO RENCHAO
YU CONG

Assignees

国网河南省电力公司南阳供电公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1. The anti-reverse power transmission intelligent circuit breaker integrated with voltage and current accurate detection comprises a shell and is characterized in that a circuit board is arranged in the shell, a detection module is arranged on the circuit board and used for synchronously collecting voltage signals and current signals on a main circuit of the circuit breaker, a rapid protection channel module is connected to the detection module and used for amplifying and judging the collected signals in real time and outputting a tripping instruction when overcurrent or reverse power transmission risks are detected, an intelligent load identification module is connected with the detection module and used for analyzing voltage and current waveform data and identifying the connected load types and equipment characteristics, a dual-channel control architecture module is used for receiving the signals of the detection module and achieving decoupling of metering and rapid protection, and a communication module is used for uploading state information to a monitoring center when the circuit breaker is powered off or fails, and an automatic disconnection assembly is arranged in the shell and used for automatically disconnecting the circuit breaker when reverse power transmission occurs.
2. The intelligent circuit breaker for preventing reverse power transmission for accurately detecting integrated voltage and current according to claim 1, wherein the detection module comprises a voltage sampling unit and a current sampling unit, the voltage sampling unit adopts a voltage dividing resistor network, and the current sampling unit adopts a Hall current sensor or a combination of a current divider and a voltage transformer.
3. The intelligent circuit breaker for preventing reverse power transmission for accurately detecting integrated voltage and current according to claim 1, wherein the rapid protection channel comprises a protection signal conditioning unit, a protection signal amplifying unit and a controller unit which are sequentially connected, the protection signal amplifying unit is provided with programmable set amplification factors, and the controller unit calculates and obtains protection current or voltage values according to amplified signals and the set amplification factors.
4. The intelligent circuit breaker for preventing reverse power transmission, which is accurately detected by integrated voltage and current according to claim 1, is characterized in that the intelligent load identification module is integrally provided with an identification method algorithm, and the identification method algorithm is used for identifying typical electric equipment such as household appliances and electric bicycles by analyzing high-frequency voltage and current waveform data and extracting equipment load characteristics, wherein the identification method algorithm comprises the steps of forming a current trend in a discontinuous acquisition mode and distinguishing capacitive loads, resistive loads and inductive loads by comparing current data change trends acquired in the process of opening and closing ports repeatedly.
5. The intelligent circuit breaker for anti-reverse power transmission with integrated voltage and current accurate detection according to claim 4, wherein when the intelligent load identification module executes an identification method algorithm program, if the intelligent load identification module identifies the intelligent load as a capacitive load, the intelligent load identification module controls the MOS switch tube to gradually increase the conduction time in a multi-time short-time pulse mode, so that soft-start charging of the capacitive load is completed.
6. The intelligent circuit breaker for preventing reverse power transmission for integrated voltage and current accurate detection according to claim 1 is characterized in that the dual-channel control architecture module comprises a metering processing circuit and a protection processing circuit which are mutually independent, the metering processing circuit comprises a metering signal conditioning unit, a metering processing unit and a metering digital isolation unit which are sequentially connected and used for realizing electric quantity metering, the protection processing circuit comprises a protection signal conditioning unit, a protection analog isolation unit and a protection signal amplification unit which are sequentially connected and used for realizing millisecond-level rapid protection action, and the output ends of the metering processing circuit and the protection processing circuit are connected to a unified controller unit.
7. The intelligent circuit breaker for anti-reverse power transmission, which is capable of accurately detecting integrated voltage and current according to claim 1, is characterized in that the communication module is integrally provided with a power line carrier communication unit, a power taking end of the power line carrier communication unit is connected to a power inlet end of the circuit breaker and is used for still maintaining communication with an upper computer when the circuit breaker body is powered off, and the communication module is further provided with an IO-LINK physical layer driver and is used for being connected to an industrial PLC network through an M12 interface.
8. The intelligent circuit breaker for preventing reverse power transmission, which is accurately detected by integrated voltage and current according to claim 1, is characterized in that the automatic disconnecting assembly comprises a bottom plate fixedly arranged on the inner side wall of the shell, a first vertical plate and a second vertical plate are fixedly connected to the bottom plate, a conductive coil is arranged between the first vertical plate and the second vertical plate, one end of the conductive coil is connected with a negative electrode terminal, the other end of the conductive coil is connected with a power supply, the power supply is connected with a positive electrode terminal, the positive electrode terminal and the negative electrode terminal are correspondingly arranged, a gap is arranged between the positive electrode terminal and the negative electrode terminal, a first guide groove is formed in the surface of the bottom plate, the first guide groove and the gap are correspondingly arranged, a conductive plate is connected to the inner portion of the first guide groove in a sliding mode, and the conductive plate is fixedly connected with a first magnet block which is arranged at a position capable of being driven by a magnetic field generated by current in a main circuit wire of the circuit breaker.
9. The intelligent circuit breaker for preventing reverse power transmission of accurate detection of integrated voltage and current according to claim 8, wherein a first spring is connected to the side wall of the second vertical plate, a second magnet block is connected to the other end of the first spring, a second guide groove corresponding to the first spring is formed in the surface of the bottom plate, the second magnet block is slidably connected with the second guide groove, a connecting rod is fixedly connected to the side wall of the second magnet block, a driving plate is fixedly connected to one end, away from the second vertical plate, of the connecting rod, and a separation assembly is connected to the driving plate.
10. The intelligent circuit breaker for preventing reverse power transmission of accurate detection of integrated voltage and current according to claim 9, wherein the separation assembly comprises an inner box fixedly arranged on the bottom plate, a static contact end plate and a movable contact end plate are fixedly arranged in the inner box, a first guide rod and a second guide rod are fixedly connected to the side wall of the movable contact end plate, the outer ends of the first guide rod and the second guide rod extend to the outside of the inner box and are connected with the side wall of the driving plate, and a second spring is arranged between the movable contact end plate and the side wall of the inner box.

Description

Anti-reverse power transmission intelligent circuit breaker integrating voltage and current accurate detection Technical Field The invention belongs to the technical field of reverse power transmission prevention, and particularly relates to a reverse power transmission prevention intelligent circuit breaker integrating voltage and current accurate detection. Background With the popularization of smart grids and distributed energy sources, the power consumption safety and the power quality management of the power distribution network end become increasingly complex. The traditional circuit breaker mainly relies on a thermomagnetic release to realize overload and short-circuit protection, has a single function, cannot monitor key parameters such as voltage and current of a circuit in real time, and further has intelligent functions of identifying load types, preventing reverse power transmission of a distributed power supply and the like. The patent publication No. CN206806271U discloses an automatic cut-off device for low-voltage reverse power transmission of a power distribution network, which is structurally characterized in that a clamping groove is formed in a shell, an electromagnetic coil is fixed in the clamping groove, two control electrodes of the electromagnetic coil are connected with a live wire and a zero wire of a power grid side line through contacts on the shell, a magnetic yoke is fixedly connected with the coil, the upper side of the magnetic yoke is connected with one end of an upper spring, the other end of the upper spring is connected with an upper armature, the lower side of the magnetic yoke is connected with one end of a lower spring, the other end of the lower spring is connected with a lower armature, the upper armature and the lower armature of the spring are respectively connected with an upper counter-force spring and a lower counter-force spring, a moving contact is fixed on the lower armature, the fixed contact is fixed on the shell, and the moving contact corresponds to the fixed contact, and has the functions of automatic tripping under-voltage and automatic switching-on under-voltage, so that a user can perform lateral reverse power transmission when the power distribution network is prevented from overhauling and power failure, and safety of an overhaul operator is guaranteed. However, the defects are that the reverse power transmission protection means is single, the logic locking based on the voltage criterion is adopted, misjudgment is easy to occur when the fault or the voltage fluctuation is complicated, a forced isolation mechanism on a physical level is lacked, and the reliability is insufficient. By adopting a single signal acquisition and processing channel, the requirements of high-precision measurement and millisecond-level rapid protection response are difficult to meet. The specific type of the access load (such as capacitive load, charging equipment and the like) cannot be identified, a differentiated power-on or protection strategy cannot be adopted according to the load characteristics, and false tripping is easily caused by load impact current. Therefore, a new intelligent circuit breaker capable of integrating high-precision sensing, rapid intelligent protection, reliable state communication and physical locking is needed. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides an anti-reverse power transmission intelligent circuit breaker integrating voltage and current accurate detection, which solves the technical problems in the background art. The intelligent circuit breaker capable of preventing reverse power transmission comprises a shell, a detection module, a rapid protection channel module, an intelligent load identification module, a dual-channel control framework module and an automatic disconnection assembly, wherein the shell is internally provided with a circuit board, the circuit board is provided with the detection module and is used for synchronously collecting voltage signals and current signals on a main circuit of the circuit breaker, the rapid protection channel module is connected to the detection module and is used for amplifying and judging the collected signals in real time and outputting a tripping instruction when overcurrent or reverse power transmission risks are detected, the intelligent load identification module is connected with the detection module and is used for analyzing voltage and current waveform data and identifying the connected load types and equipment characteristics, the dual-channel control framework module is used for receiving signals of the detection module to realize decoupling of metering and rapid protection, and the communication module is used for uploading state information to a monitoring center when the circuit breaker is disconnected or fails, and the automatic disconnection assembly is arranged in the shell and is used for automatically disconnecting the