CN209913577U

CN209913577U - Intelligent breaker controller for distribution transformer of low-voltage distribution area of Internet of things

Info

Publication number: CN209913577U
Application number: CN201920722037.3U
Authority: CN
Inventors: 王兰军; 王飞; 冼兴泉
Original assignee: GUANGDONG FODIAN ELECTRIC APPLIANCE CO Ltd
Current assignee: GUANGDONG FODIAN ELECTRIC APPLIANCE CO Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2020-01-07
Anticipated expiration: 2029-05-20

Abstract

An intelligent circuit breaker controller for distribution transformer of low-voltage distribution transformer of Internet of things is characterized in that signals obtained by a three-phase main loop current detection unit, a leakage current detection unit and a circuit breaker temperature detection unit pass through a 16-bit micro control unit MCU₁The asynchronous communication data is output from an asynchronous communication receiving/sending port after receiving, calculating and processing and is sent to an upper computer through a 485 communication driving unit and a 485 bus; the system is also provided with a low-power consumption micro control unit MCU₂When the three-phase power supply of the main loop is cut offMicro control unit MCU with low power consumption₂From an asynchronous transmission port T_XSending a power failure fault signal to the 485 communication driving unit and uploading the power failure fault signal to an upper computer; the system is also provided with a double power supply mode of a direct current working power supply and a double tripping mechanism of electromagnetic tripping and motor tripping. The system can effectively guarantee the power utilization safety of the transformer area.

Description

Intelligent breaker controller for distribution transformer of low-voltage distribution area of Internet of things

Technical Field

The utility model relates to a transformer platform district is joined in marriage and is become intelligent circuit breaker technical field, especially relates to a thing networking low pressure platform district is joined in marriage and is become intelligent circuit breaker controller.

Background

With the rapid development of economy in China and the continuous improvement of the living standard of people, the demand on electric energy is more and more, how to monitor the electricity utilization condition of each district and ensure the safety and continuity of electricity utilization is always the most important attention target of the power distribution department of a power grid. Although the existing monitoring type intelligent circuit breaker solves the problem of obtaining and monitoring the power utilization parameters of a transformer area, the existing monitoring type intelligent circuit breaker also needs to solve the problem of confirming alarm information when a three-phase power supply fault occurs.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a thing networking low pressure platform district joins in marriage and becomes intelligent circuit breaker controller, it can carry out real time monitoring to key parameters such as the electric leakage of transformer platform district, three-phase main loop current, the temperature of circuit breaker to can send outage alarm information under the circumstances of three-phase main loop outage, thereby, ensure transformer platform district power consumption safety effectively.

The utility model provides a technical solution is like this:

intelligent breaker controller of distribution transformer of low-voltage distribution area of Internet of things, three-phase main loop current I_A、I_B、I_CObtaining U after rectification and signal conditioning conversion_A、U_B、U_CThe voltage signals are connected to a 16-bit micro control unit MCU₁ADC (₁Port and ADC₂Port and ADC₃A port; leakage current I_△Converted into a voltage signal U by a leakage current detection circuit_△And is connected into a 16-bit micro control unit MCU₁ADC (₄Port, leakage current I_△The detection alarm range is divided into three grades: 50-500 mA, 150-1500 mA, 300-3000 mA, circuit breaker temperature detection unit D_TOutput voltage signal U_TAccess 16 bit micro control unit MCU₁ADC (₅A port; 16-bit micro control unit MCU₁R of (A) to (B)_X/T_XPort andthe first asynchronous communication port of the 485 communication driving unit is connected in a bidirectional mode, and the output port of the 485 communication driving unit is connected with the upper computer in a bidirectional mode through an RS485 bus; 16-bit micro control unit MCU₁The two I/O ports of the tripping driving unit are respectively connected with two input ports of the tripping driving unit, and two output ports of the tripping driving unit are respectively connected with an electromagnetic tripping coil L and a tripping motor M; system DC working power supply V_W1The power supply mode of parallel connection of three-phase power supply step-down transformer and three-phase main loop current is adopted, when I is less than 20 percent I_nWhen I is more than or equal to 20 percent I, the three-phase power supply step-down transformer rectifies and supplies power_nIn time, the power is rectified by a secondary signal of the three-phase main loop current, wherein I_nRated current of the three-phase main loop, and real-time current of the three-phase main loop; and a low-power consumption Micro Control Unit (MCU)₂And a control triode G₁And a standby battery unit with charging and power supplying functions for controlling the transistor G₁Collector and low-power consumption micro control unit MCU₂Wake-up port RA₅Connected with the output end of the standby battery unit and the low-power consumption micro control unit MCU₂Power input port Vw₃Phase connection, low power consumption micro control unit MCU₂Asynchronous transmission port T of_XAnd the second asynchronous communication port of the 485 communication driving unit is connected.

The 16-bit micro control unit MCU₁I/O of₁The port is connected with a keyboard, and a 16-bit micro control unit MCU₁I/O of₂The port is connected with an LCD display.

Is provided with a three-stage voltage-stabilized DC working power supply and a first-stage voltage-stabilized DC working power supply V_w1= 12V, supplying power to the standby battery unit and controlling the triode G₁The substrate, the electromagnetic trip coil L and the trip motor M; second-stage voltage-stabilizing DC working power supply V_w2Power supply at 16 bit micro control unit MCU of = +5V₁(ii) a Third-stage voltage-stabilizing direct-current working power supply V_w3Power supply at 16 bit micro control unit MCU of = +3.3V₁The circuit breaker temperature detection circuit; the standby battery unit outputs +3.3V to the low-power consumption micro control unit MCU₂Power input port V_w3。

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) when transformer in transformer area breaks down, for example when three-phase power supply system cuts off the power supply, also can with the help of the information of "outage warning". The utility model discloses a low-power consumption micro control unit MCU of terminal controller system₂The information is sent to an upper computer through a 485 communication driving unit, so that the problem of transmission and confirmation of three-phase power supply outage fault information is effectively solved.

(2) The terminal controller system adopts a compact power supply scheme which integrates the rectification of a secondary signal of three-phase main loop current as the power supply of the direct current working power supply and the detection of the main loop current in a parallel mode besides adopting the rectification and filtering of a three-phase power supply step-down transformer to supply the direct current working power supply. When the current I of the main loop is less than 20 percent I_nWhen the rated current of the main loop is used, the three-phase power supply step-down transformer rectifies and supplies power, and when I is more than or equal to 20 percent, I_nIn the process, the power is rectified and supplied by a secondary signal of the current of the three-phase main loop, so that the whole hardware module is not in any direct contact with the strong current circuit when the system is in normal operation, the interference from a power supply end is shielded, and the anti-interference capability is strong.

(3) The circuit breaker controller system is provided with the double-parallel tripping mechanism, namely, a double-parallel tripping scheme of electromagnetic tripping and motor tripping is adopted, so that the reliability of tripping is improved.

Drawings

Fig. 1 is the utility model relates to an electric principle structure block diagram of thing networking low-voltage transformer district distribution transformer intelligent circuit breaker controller.

Fig. 2 is a schematic diagram of the current detection and power supply of the three-phase main loop shown in fig. 1.

Fig. 3 is an electrical schematic diagram of the leakage current detection shown in fig. 1.

Fig. 4 is an electrical schematic diagram of the temperature sensing of the circuit breaker shown in fig. 1.

Fig. 5 is a schematic diagram of a circuit connection structure of the low power consumption micro-control unit shown in fig. 1 and a rechargeable backup battery.

Fig. 6 is a software flow diagram of the low power consumption micro control unit shown in fig. 5.

Fig. 7 is an electrical schematic diagram of the three-stage regulated dc operating power supply shown in fig. 1.

Fig. 8 is an electrical schematic of the three-phase power step-down transformer of fig. 1.

Detailed Description

The present invention is further illustrated by the following examples.

Referring to fig. 1 to 8, an intelligent breaker controller for distribution transformer of low-voltage transformer area of internet of things is provided, and the current I of a three-phase main loop_A、I_B、I_CObtaining U after rectification and signal conditioning conversion_A、U_B、U_CThe voltage signals are connected to a 16-bit micro control unit MCU₁ADC (₁Port and ADC₂Port and ADC₃Port, leakage current I_△Converted into a voltage signal U by a leakage current detection circuit_△And is connected into a 16-bit micro control unit MCU₁ADC (₄Port, leakage current I_△The detection alarm range is divided into three grades: 50-500 mA, 150-1500 mA, 300-3000 mA, circuit breaker temperature detection unit D_TOutput voltage signal U_TAccess 16 bit micro control unit MCU₁ADC (₅A port; 16-bit micro control unit MCU₁R of (A) to (B)_X/T_XThe port is bidirectionally connected with the first asynchronous communication port of the 485 communication driving unit, the output port of the 485 communication driving unit is bidirectionally connected with an upper computer through an RS485 bus, and the 16-bit micro control unit MCU₁The two I/O ports of the tripping driving unit are respectively connected with two input ports of the tripping driving unit, and two output ports of the tripping driving unit are respectively connected with an electromagnetic tripping coil L and a tripping motor M; system DC working power supply V_W1The power supply mode of parallel connection of three-phase power supply step-down transformer and three-phase main loop current is adopted, when I is less than 20 percent I_nWhen I is more than or equal to 20 percent I, the three-phase power supply step-down transformer rectifies and supplies power_nIn time, the power is rectified by a secondary signal of the three-phase main loop current, wherein I_nRated current of the three-phase main loop, and a real-time circuit of the three-phase main loop; and a low-power consumption Micro Control Unit (MCU)₂And a control triode G₁And with provision for charging and supplyingControlling the transistor G by a battery unit₁Collector and low-power consumption micro control unit MCU₂Wake-up port RA₅Connected with the output end of the standby battery unit and the low-power consumption micro control unit MCU₂Power input port Vw₃Phase connection, low power consumption micro control unit MCU₂Asynchronous transmission port T of_XAnd the second asynchronous communication port of the 485 communication driving unit is connected.

The low-power consumption micro control unit MCU₂An integrated part P1C12LF1822 is selected, and RA thereof₅Port and control triode G₁Is connected with the collector of the control triode G₁The base electrode of the power supply is connected with a +12V direct current working power supply V through a current-limiting resistor_W1Are connected. When the main loop normally operates, the +12V DC working power supply V_W1Charging the spare battery, the low power consumption micro control unit MCU₂In a sleep state; when the three-phase main loop is in power-off condition, the +12V working power supply V_W1When the power is lost, the triode G is controlled₁The collector potential rises to awaken the low-power consumption micro control unit MCU₂Thereafter, the low power consumption micro control unit MCU₂Through which asynchronous transmission port T_XThe power failure fault signal is periodically sent to the 485 communication driving unit, the sending period can reach 4 minutes, and the sending interval is low in powerMicro control unit MCU₂The sleep state is recovered until the +12V working power supply V_W1And (4) recovering. Even if the main loop is in the power-off condition, the MCU is controlled due to low power consumption₂The power-off alarm device is in a state of periodically sending power-off alarm signals, and is in a sleep state at sending intervals, so that the power consumption is extremely low, and long-time power-off alarm can be maintained. Low-power consumption micro control unit MCU₂See fig. 6 for a software flow of (a).

Referring to fig. 2, an electrical schematic diagram of the three-phase main loop current detection and the secondary signal of the three-phase main loop current as the dc working power supply is shown, wherein the three-phase current I of the main loop_A、I_B、I_CThrough the respective corresponding current transformer CT_A、CT_B、CT_CObtaining secondary signals through a rectifier bridge BG_A、BG_B、BG_CDC power supply E after rectification output phase OR⁺Main current of phase A I_AThe secondary signal is rectified, and the direct current output from the negative electrode passes through a sampling resistor R_AA filter circuit (composed of a resistor R)_A1、R_A2And a capacitor C_AComposition) and an inverting amplification operational amplifier circuit OP_AIs converted into U_AThe voltage signal is transmitted to a 16-bit micro control unit MCU₁ADC (₁A port; similarly, main current I of B phase and C phase_B、I_CConverted into U by the same circuit as A_B、U_CThe voltage signals are respectively transmitted to a 16-bit micro control unit MCU₁ADC (₂And ADC₃A port.

Leakage current I_△Through a current transformer CT_ATwo protective diodes D with obtained secondary signals connected in parallel in reverse direction₁、D₂Sampling resistor R₁Filter capacitor C₁And an inverting amplification OP circuit_△Is converted into U_△The voltage signal is transmitted to a 16-bit micro control unit MCU₁ADC (₄Ports, see fig. 3.

Circuit breaker temperature detection unit D_TSelecting a digital temperature sensor with the model number of DS18B20, and the DC working voltage is V_W3= 3.3V, the sensingVoltage signal U obtained by the device_TMCU (microprogrammed control Unit) for conveying to 16-bit micro control unit₁ADC (₅Ports, see fig. 4.

The controller system is provided with a three-stage regulated DC power supply, as shown in FIG. 7, in the first stage regulated DC power supply, ZD is a zener diode with a nominal regulated value of +12V, and a variable resistor R_I4And R_I5The ratio of (3) can adjust the voltage stabilizing value of the voltage stabilizing diode ZD. When three-phase current I of main circuit_A、I_B、I_CAny phase current is increased from start to more than or equal to 20 percent I_n(rating of phase current of main circuit) E⁺A certain voltage is generated at the end when E⁺When the voltage to the ground exceeds +12V, the triode G₂Starting to conduct; when E is⁺When the voltage continues to rise, the triode G₂After being conducted, at the resistor R_I2The voltage formed will make the field effect transistor G₃Conducting; further, the field effect transistor G₃The voltage at the two ends is limited to a position slightly larger than + 12V; first-stage voltage-stabilizing direct-current working voltage V_W1Slave diode D_IAnd (6) outputting. The second stage voltage-stabilizing DC working power supply selects a voltage-stabilizing integrated block LM7805, and the output voltage-stabilizing DC working voltage V_W2Is + 5V; the third-stage voltage-stabilizing DC working power supply adopts a voltage-stabilizing integrated block LM117-3.3, and the output voltage of the voltage-stabilizing DC working power supply is stabilized by a voltage-stabilizing DC working voltage V_W3Is + 3.3V.

The controller system adopts a parallel power supply mode of three-phase power supply step-down transformer rectification power supply and three-phase main loop current secondary signal rectification power supply, and as shown in fig. 8, fig. 2 and fig. 1, the working process is as follows:

when the power is on, the current I of the main loop is in the idle state_A、I_B、I_CWhen the secondary signal is approximately equal to 0, the secondary signal can not supply +12V direct current working power supply to the controller system, at the moment, the +12V direct current working power supply is supplied to the system by the three-phase power supply step-down transformer, and at the moment, even if two phases are lost in a three-phase main loop, as long as one phase runs, the +12V non-stabilized direct current output can be obtained.

When the power-on operation is normal, the current of the main loop of any phase in the three-phase main loop rises to≥20%I_nWhen it is, it is output to V_W1The DC working voltage at the end will be slightly > +12V through the diode D_A、D_B、D_CAnd D₅The OR circuit can automatically cut off the rectified power supply of the three-phase power supply step-down transformer; the current I in the main loop is more than or equal to 20 percent I_nUnder the normal operation condition, the +12V direct current working power supply of the system is completely controlled by the main loop current I_A、I_B、I_CIs self-generating powered.

Claims

1. The utility model provides a change intelligent circuit breaker controller is joined in marriage in thing networking low-voltage transformer district which characterized in that: three-phase main loop current I_A、I_B、I_CObtaining U after rectification and signal conditioning conversion_A、U_B、U_CThe voltage signals are connected to a 16-bit micro control unit MCU₁ADC (₁Port and ADC₂Port and ADC₃Port, leakage current I_△Converted into a voltage signal U by a leakage current detection circuit_△And is connected into a 16-bit micro control unit MCU₁ADC (₄Port, leakage current I_△The detection alarm range is divided into three grades: 50-500 mA, 150-1500 mA, 300-3000 mA, circuit breaker temperature detection unit D_TOutput voltage signal U_TAccess 16 bit micro control unit MCU₁ADC (₅A port; 16-bit micro control unit MCU₁R of (A) to (B)_X/T_XThe port is bidirectionally connected with the first asynchronous communication port of the 485 communication driving unit, the output port of the 485 communication driving unit is bidirectionally connected with an upper computer through an RS485 bus, and the 16-bit micro control unit MCU₁The two I/O ports of the tripping driving unit are respectively connected with two input ports of the tripping driving unit, and two output ports of the tripping driving unit are respectively connected with an electromagnetic tripping line graph L and a tripping motor M; system DC working power supply V_W1The power supply mode of parallel connection of three-phase power supply step-down transformer and three-phase main loop current is adopted, when I is less than 20 percent I_nWhen I is more than or equal to 20 percent I, the three-phase power supply step-down transformer rectifies and supplies power_nIn time, the power is rectified by a secondary signal of the three-phase main loop current, wherein I_nRated current of the three-phase main loop, and a real-time circuit of the three-phase main loop; and a low-power consumption Micro Control Unit (MCU)₂And a control triode G₁And a standby battery unit with charging and power supplying functions for controlling the transistor G₁Collector and low-power consumption micro control unit MCU₂Wake-up port RA₅Connected with the output end of the standby battery unit and the low-power consumption micro control unit MCU₂Power input port Vw₃Phase connection, low power consumption micro control unit MCU₂Asynchronous transmission port T of_XAnd the second asynchronous communication port of the 485 communication driving unit is connected.

2. The internet of things low-voltage distribution transformer intelligent circuit breaker controller according to claim 1, characterized in that: the 16-bit micro control unit MCU₁I/O of₁The port is connected with a keyboard, and a 16-bit micro control unit MCU₁I/O of₂The port is connected with an LCD display.

3. The internet of things low-voltage distribution transformer intelligent circuit breaker controller according to claim 1, characterized in that: is provided with a three-stage voltage-stabilized DC working power supply and a first-stage voltage-stabilized DC working power supply V_w1= 12V, supplying power to the standby battery unit and controlling the triode G₁The substrate, the electromagnetic trip coil L and the trip motor M; second-stage voltage-stabilizing DC working power supply V_w2Power supply at 16 bit micro control unit MCU of = +5V₁(ii) a Third-stage voltage-stabilizing direct-current working power supply V_w3Power supply at 16 bit micro control unit MCU of = +3.3V₁The circuit breaker temperature detection circuit; the standby battery unit outputs +3.3V to the low-power consumption micro control unit MCU₂Power input port V_w3。