CN220019708U - Intelligent electric safety protector - Google Patents

Abstract

The utility model aims to provide a structure comprising a wiring terminal temperature detection and three-phase unidirectional pulsation sine wave motor current detection protection circuit, a main shell and a display, wherein the electric safety intelligent protection device is characterized in that a temperature sensor is added on the wiring terminal to control the temperature of the wiring terminal by a singlechip, and when the temperature of the wiring terminal exceeds a specified value, a power supply is cut off, so that unexpected fire caused by serious heating of the wiring terminal is avoided, and the personal and property are not seriously lost. The current detection protection circuit of the three-phase unidirectional pulsation sine wave motor is characterized in that a reference voltage is added on the central line of a three-phase transformer in the motor protection circuit, the circuit is simple, the current sampling outputs complete three-phase pulsation unidirectional sine wave, and the three-phase unidirectional pulsation sine wave enters a singlechip for processing to realize the overcurrent overload protection and the unbalanced protection of three-phase working current of the motor.

Description

Intelligent electric safety protector

Technical Field

The utility model relates to the fields of safety electricity utilization and motor protection, in particular to an electric safety intelligent protection device.

Background

At present, the safety electricity protection field and the motor protection field and high-power electric appliances enter common families, the electricity load of municipal commercial facilities is increased, the electricity complexity of production links is increased, the insulation destruction of the electricity consumption and the complex environment of the high load is easy to occur to cause electric fire, a large number of wiring terminals are arranged in power supply electric equipment, such as a power supply house lead-in bus, a power distribution anti-interruption circuit breaker, a contactor and other wiring terminals, and the electric fire can be caused due to heating caused by overlarge current or loose wiring and the like. In the field of motor protection, although products with different brand names exist, in fact, the circuit structure is thousands of times and uniformly, and the circuit structure is different in size and has no characteristics.

Disclosure of Invention

Aiming at the defects, the utility model solves the problems that the automatic detection of the electric appliance including the insulation of a motor and the insulation between all circuit wires and the insulation to the ground are realized through the intelligent control of a single chip microcomputer in an electric safety intelligent protection device, if the insulation is found to be not up to standard, an automatic control breaking executing mechanism or an electric safety protection measuring and controlling device or a circuit breaker can not switch on or switch off a contactor, the electric safety intelligent protection device can process in advance, the accidents such as electric shock casualties, the damage due to the fact that the electric shock is generated, the electric safety intelligent protection device is easy to generate insulation damage in a complex environment, and the like are avoided, the safety of personal machines and equipment is realized, and the safety of the personal machines and the equipment is ensured. The current detection protection circuit of the three-phase unidirectional pulsation sine wave motor is characterized in that a reference voltage is added on the central line of a three-phase transformer in the motor protection circuit, the circuit is simple, the current sampling outputs complete three-phase pulsation unidirectional sine wave, and the three-phase unidirectional pulsation sine wave enters a singlechip for processing to realize the overcurrent overload protection and the unbalanced protection of three-phase working current of the motor.

The technical proposal of the utility model is an electric safety intelligent protection device, which comprises a wiring terminal temperature detection and three-phase unidirectional pulsation sine wave motor current detection protection circuit, a main shell and a structure of a display, and is characterized in that the electric safety intelligent protection device is characterized in that a temperature sensor is added on a wiring terminal to carry out temperature protection on the wiring terminal by a singlechip, when the temperature of the wiring terminal exceeds a specified value, the power supply is cut off, the wiring terminal is prevented from serious heating to cause unexpected fire, the personal and property are not seriously lost, a temperature sensor RF1 is clung to a power supply wire inlet wiring terminal A1, a temperature sensor RF2 is clung to a power supply wire inlet wiring terminal B1, a temperature sensor RF3 is clung to a power supply wire inlet wiring terminal C1, a temperature sensor RF4 is clung to a motor wire outlet wiring terminal A2, a temperature sensor RF5 is clung to a motor wire outlet wiring terminal B2, a temperature sensor RF6 is clung to the motor wire outlet wiring terminal C2 to respectively detect the temperature of each wiring terminal, the detection result enters the MCU processing of the singlechip chip, if the heating of one wiring terminal exceeds a specified value due to overlarge current or poor contact, the contactor JQ1 is controlled to be disconnected, fire disaster or other accidents can be effectively avoided, the circuit structure is that 6 identical temperature detection circuits respectively detect 6 wiring terminals, one temperature detection circuit is that the temperature detection circuit of the power supply inlet wiring terminal A1 is that the temperature sensor RF1 is tightly attached to the power supply inlet wiring terminal A1, the temperature sensor RF1 is connected with the resistor RF7, the resistor RF8 and the capacitor CF1, the other end of the resistor RF7 is connected with the positive power supply Vcc, the other end of the resistor RF8 is connected with the capacitor CF2 and the MCU chip, the other ends of the temperature sensor RF1, the capacitor CF1 and the capacitor CF2 are connected with the common end V0, the connection terminal A, the connection terminal B, the connection terminal Jb and the connection terminal C are connected to the contactor JQ1, and the connection terminal skeleton (19) is fixed by screws through the connection terminal skeleton fixing holes (20).

The electric safety intelligent protection device is characterized in that a three-phase unidirectional pulsation sine wave motor current detection protection circuit and the electric safety intelligent protection device are arranged in the same shell, a positive voltage is applied to the central lines of a split transformer LA, a transformer LB and a transformer LC, three-phase unidirectional pulsation sine wave current signals are respectively obtained during detection and sampling, the working principle is that positive voltage values divided by a resistor R4 and a resistor R5 are applied to positive voltages on the central lines of the transformer LA, the transformer LB and the transformer LC through the output of an operational amplifier follower U2D, motor working currents detected through the three-phase transformers are respectively output three-phase unidirectional pulsation sine wave current signals through the operational amplifier follower U2A, the operational amplifier follower U2B and the operational amplifier follower U2C, and three-phase current full-wave detection is realized through a simple circuit of the operational amplifier follower, the single chip microcomputer chip MCU is used for controlling the contactor JQ1 to carry out overload, locked rotor, short circuit, phase failure and three-phase current unbalance protection, the contactor JQ2, the contactor JQ3 and the contactor JQ4 are used for controlling the motor to start running in positive and negative rotation and voltage reduction, the circuit structure is that the phase A power supply A is connected with the contactor JQ1 through a power inlet wire connecting terminal A1 and a connecting terminal A connecting wire Ja, the phase B power supply B is connected with the contactor JQ1 through a power inlet wire connecting terminal B1 and a connecting terminal B connecting wire Jb, the phase C power supply C is connected with the contactor JQ1 through a power inlet wire connecting terminal C1 and a connecting terminal C connecting wire Jc, the other end of the contactor JQ1 contact is respectively connected with a motor A connecting wire A3, a motor B connecting wire B3 and a motor C connecting wire C3, the motor A3 is connected with a motor outlet wire connecting terminal A2 through a transformer LA, the motor B is connected with a motor wire outlet connecting terminal B2 through a transformer LB, the motor C is connected with a motor wire outlet connecting terminal C2 through a transformer LC, the motor wire outlet connecting terminal A2, the motor wire outlet connecting terminal B2 and the motor wire outlet connecting terminal C2 are connected with a motor M, a resistor R4 is connected with a resistor R5, a capacitor C8 and the positive input end of an operational amplifier follower U2D, the other end of the resistor R4 is connected with a positive power supply Vcc, the other ends of the resistor R5 and the capacitor C8 are connected with a common end V0, the negative input end of the operational amplifier follower U2D is connected with the output end of the operational amplifier follower U2D, the positive electrode of a diode D8, the negative electrode of a diode D7, the capacitor C7 and an inductor L4, the negative electrode of the diode D8 is connected with the positive power supply Vcc, the positive electrode of the diode D7 and the other end of the capacitor C7 are connected with the common end V0, one end of the mutual inductor LA, one end of the mutual inductor LB and one end of the mutual inductor LC are connected together to form a central line of the mutual inductor LA, the mutual inductor LB and the mutual inductor LC, the other end of the inductor L4 is connected with the mutual inductor LA, the mutual inductor LB and the central line of the mutual inductor LC, the other end of the mutual inductor LA is connected with the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the diode D2, the negative electrode of the diode D1, the capacitor C1 and the positive input end of the operational amplifier follower U2A, the negative input end of the operational amplifier follower U2A is connected with the output end of the operational amplifier follower U2A, the resistor R1 and the capacitor C2 enter the singlechip chip MCU, the negative electrode of the diode D2 is connected with the positive power supply Vcc, the positive electrode of the diode D1 and the other end of the capacitor C1 are connected with the common end V0, the other end of the mutual inductor LB is connected with the inductor L2, the other end of the inductor L2 is connected with the positive electrode of the diode D4, the negative electrode of the diode D3, the capacitor C3 and the positive input end of the operational amplifier U2B, the negative input end of the operational amplifier follower U2B is connected with the output end of the operational amplifier follower U2B, the resistor R2 and the capacitor C4, the negative electrode of the diode D4 is connected with the positive power supply Vcc, the positive electrode of the diode D3 and the other end of the capacitor C3 are connected with the public end V0, the other end of the capacitor C4 is connected with the public end V0, the other end of the transformer LC is connected with the inductor L3, the other end of the inductor LC is connected with the positive electrode of the diode D6, the negative electrode of the diode D5, the capacitor C5 and the positive input end of the operational amplifier follower U2C, the negative input end of the operational amplifier follower U2C is connected with the output end of the operational amplifier follower U2C, the resistor R3 and the capacitor C6, the negative electrode of the diode D6 is connected with the positive power supply Vcc, the positive pole of diode D5 and the other end of condenser C5 are connected public end V0, public end V0 is connected to the other end of condenser C6, singlechip chip MCU output control connecting resistance JR1, triode JBG's base is connected to the resistance JR1 other end, contactor JQ1 coil is connected to triode JBG's collecting electrode, diode JD 1's positive pole and electrolytic capacitor JC1 negative pole, contactor JQ1 coil's the other end, diode JD 1's negative pole and condenser JC 1's positive pole are connected positive power supply 12V, public end V0 is connected to triode JBG 1's projecting pole, singlechip chip MCU is connected to start button QA one end, singlechip chip MCU is connected to stop button QT one end, public end V0 is connected to start button QA and stop button QT's the other end.

The electric safety intelligent protection device is characterized in that a main shell of the electric safety intelligent protection device and a structure of a display and a multifunctional motor protection device are arranged in the same shell, data are displayed on the same display, the main shell and the structure of the display are formed by connecting and fixing an upper shell (2) and a lower shell (1) into a whole through a main shell connecting screw hole (3) and a main shell fixing screw hole by fixing screws, a circuit board is respectively and fixedly arranged in the main shell, a first connecting terminal plug seat (8), a second connecting terminal plug seat (9), a third connecting terminal plug seat (10), a fourth connecting terminal plug seat (11), a fifth connecting terminal plug seat (12), a sixth connecting terminal plug seat (13), a seventh connecting terminal plug seat (14) and an eighth connecting terminal plug seat (15) on the main shell, and a connecting display socket (6) and a function indicating lamp (5) on the main shell are respectively and compactly arranged, and the structure of the display mainly comprises a display shell (16), a display screen (17) and a fixing buckle (18).

The utility model aims to solve the problem that the intelligent electric safety protection device is realized by the intelligent control of a singlechip, the automatic detection of the electric appliance including the insulation of a motor and the insulation to the ground between all circuit wires under the condition of power failure, and further provides a structure comprising a connecting terminal temperature detection and three-phase unidirectional pulsation sine wave motor current detection protection circuit, a main shell and a display. The current detection protection circuit of the three-phase unidirectional pulsation sine wave motor is characterized in that a reference voltage is added on the central line of a three-phase transformer in the motor protection circuit, the circuit is simple, the current sampling outputs complete three-phase pulsation unidirectional sine wave, and the three-phase unidirectional pulsation sine wave enters a singlechip for processing to realize the overcurrent overload protection and the unbalanced protection of three-phase working current of the motor.

Drawings

Fig. 1 schematic diagram of a temperature and motor protection circuit for a terminal

FIG. 2 is a schematic diagram of a temperature detecting structure of a connection terminal

Figure 3 external view of main casing of electric safety intelligent protector

Figure 4 is a diagram of the external appearance of the display housing of the intelligent electrical safety protection device

In fig. 1-2: R1-R5 resistor, RF1-RF6 temperature sensor, RF7-RF18 resistor, JR1-JR4 resistor, C1-C8 capacitor, CF1-CF12 capacitor, JC1-JC4 electrolytic capacitor, D1-D8 diode, JD1-JD4 diode, JBG-JBG triode, U2A operational amplifier follower, U2B operational amplifier follower, U2C operational amplifier follower, U2D operational amplifier follower, MCU singlechip chip, LA transformer, LB transformer, LC transformer, L1-L4 inductor, JQ1-JQ4 contactor, B B phase power supply, C C phase power supply, N power supply zero line, U2B operational amplifier follower, L1-L4 inductor, JQ1-JQ4 contactor, L power supply, N power supply zero line, N power supply A1 power inlet wire binding post, B1 power inlet wire binding post, C1 power inlet wire binding post, A2 motor outgoing line binding post, B2 motor outgoing line binding post, C2 motor outgoing line A3 motor A links to each other the wiring, B3 motor B links to each other the wiring, C3 motor C links to each other the wiring, ja binding post A links to each other the wiring, jb binding post B links to each other the wiring, JC binding post C links to each other the wiring, V+24 positive power, vcc positive power, V0 public terminal, E ground wire, QA start button, QT stop button, display screen EGB, M motor, 19 binding post skeleton, 20 binding post skeleton fixed orifices.

In fig. 3-4: the display device comprises a lower shell, an upper shell, a main shell connecting screw hole, a label position 4, a function indicator lamp 5, a display connecting socket 6, a bus interface hole 7, a wiring terminal plug 8, a wiring terminal plug 9, a wiring terminal plug 10, a wiring terminal plug 11, a wiring terminal plug 12, a wiring terminal plug 13, a wiring terminal plug six, a wiring terminal plug 14, a wiring terminal socket 15, a display shell 16, a display screen 17 and a fixing buckle 18.

Fig. 1 is a schematic diagram of a terminal temperature and motor protection circuit, and fig. 2 is a schematic diagram of a terminal temperature detection structure.

The intelligent electric safety protection device is characterized in that a temperature sensor is added on a wiring terminal to carry out temperature protection on the wiring terminal under the control of a singlechip, when the temperature of the wiring terminal exceeds a specified value, a power supply is cut off, unexpected fire caused by serious heating of the wiring terminal is avoided, people and property are not seriously lost, a temperature sensor RF1 is clung to a power supply inlet wiring terminal A1, a temperature sensor RF2 is clung to a power supply inlet wiring terminal B1, a temperature sensor RF3 is clung to a power supply inlet wiring terminal C1, a temperature sensor RF4 is clung to a motor outlet wiring terminal A2, a temperature sensor RF5 is clung to a motor outlet wiring terminal B2, the temperature of each wiring terminal is detected respectively, a detection result enters a singlechip chip MCU to be processed, if the heating of one of the wiring terminals exceeds the specified value due to overlarge current or poor contact, a contactor JQ1 is controlled to be disconnected, and the occurrence of fire or other accidents can be effectively avoided.

The three-phase unidirectional pulsation sine wave motor current detection protection circuit and the electric safety intelligent protection device are arranged in the same shell, a positive voltage is applied to the central lines of a split transformer LA, a transformer LB and a transformer LC, three-phase unidirectional pulsation sine wave current signals are respectively obtained during detection sampling, the working principle is that positive voltage values divided by a resistor R4 and a resistor R5 are output through an operational amplification follower U2D and are applied to positive voltages on the central lines of the transformer LA, the transformer LB and the transformer LC, motor working currents detected through the three-phase transformers are respectively output three-phase unidirectional pulsation sine wave current signals through an operational amplification follower U2A, an operational amplification follower U2B and an operational amplification follower U2C, three-phase current full wave detection is realized through a simple circuit of each phase, the three-phase unidirectional pulsation sine wave current signals enter a singlechip chip MCU for processing, and the singlechip chip MCU is used for controlling the protection of overcurrent overload, blocking, short circuit, open phase and unbalanced three-phase currents, and the contactor JQ2 and the contactor JQ4 are used for controlling the forward and reverse rotation and the voltage reduction of a motor.

Detailed Description

The temperature detection circuit structure of the wiring terminal is that 6 identical temperature detection circuits detect 6 wiring terminals respectively, wherein one temperature detection circuit is that a power inlet wire wiring terminal A1 is that a temperature sensor RF1 is clung on the power inlet wire wiring terminal A1, the temperature sensor RF1 is connected with a resistor RF7, a resistor RF8 and a capacitor CF1, the other end of the resistor RF7 is connected with a positive power supply Vcc, the other end of the resistor RF8 is connected with a capacitor CF2 and a singlechip chip MCU, and the other ends of the temperature sensor RF1, the capacitor CF1 and the capacitor CF2 are connected with a public end V0. The connection terminal A, the connection terminal B, the connection terminal Jb and the connection terminal C are connected to the contactor JQ1, and the connection terminal skeleton (19) is fixed by screws through the connection terminal skeleton fixing holes (20).

The three-phase unidirectional pulsation sine wave motor current detection protection circuit structure is that an A-phase power supply A is connected with a contactor JQ1 through a power inlet wire connecting terminal A1 and a connecting terminal A connecting wire Ja, a B-phase power supply B is connected with a contactor JQ1 through a power inlet wire connecting terminal B1 and a connecting terminal B connecting wire Jb, a C-phase power supply C is connected with a contactor JQ1 through a power inlet wire connecting terminal C1 and a connecting terminal C connecting wire Jc, the other end of a contact of the contactor JQ1 is respectively connected with a motor A connecting wire A3, a motor B connecting wire B3 and a motor C connecting wire C3, the motor A connecting wire A3 is connected with a motor outlet wire connecting terminal A2 through a transformer LA, the motor B connecting wire B3 is connected with a motor outlet wire connecting terminal B2 through a transformer LB, the motor C connecting wire C3 is connected with a motor outlet wire connecting terminal C2 through a transformer LC, the motor outgoing line wiring terminal A2, the motor outgoing line wiring terminal B2 and the motor outgoing line wiring terminal C2 are connected with the motor M, the resistor R4 is connected with the resistor R5, the capacitor C8 and the positive input end of the operational amplification follower U2D, the other end of the resistor R4 is connected with the positive power supply Vcc, the other end of the resistor R5 and the other end of the capacitor C8 are connected with the common end V0, the negative input end of the operational amplification follower U2D is connected with the output end of the operational amplification follower U2D, the positive electrode of the diode D8, the negative electrode of the diode D7, the capacitor C7 and the inductor L4, the negative electrode of the diode D8 is connected with the positive power supply Vcc, the positive electrode of the diode D7 and the other end of the capacitor C7 are connected with the common end V0, one end of the transformer LA, one end of the transformer LB and one end of the transformer LC are connected together to form the center lines of the transformer LA, the transformer LB and the transformer LC, the other end of the inductor L4 is connected with the center lines of the transformer LA, the transformer LB and the transformer LC, the other end of the mutual inductor LA is connected with an inductor L1, the other end of the inductor L1 is connected with the positive electrode of a diode D2, the negative electrode of the diode D1, a capacitor C1 and the positive input end of an operational amplifier follower U2A, the negative input end of the operational amplifier follower U2A is connected with the output end of the operational amplifier follower U2A, a resistor R1 and a capacitor C2 enter a singlechip chip MCU, the negative electrode of the diode D2 is connected with a positive power supply Vcc, the positive electrode of the diode D1 and the other end of the capacitor C1 are connected with a common end V0, the other end of the capacitor C2 is connected with a common end V0, the other end of the mutual inductor LB is connected with the inductor L2, the other end of the inductor L2 is connected with the positive electrode of a diode D4, the negative electrode of the capacitor C3 and the positive input end of the operational amplifier follower U2B, the negative input end of the operational amplifier follower U2B is connected with the output end of the operational amplifier U2B, the resistor R2 and the capacitor C4 enter the singlechip chip MCU, the negative electrode of the diode D4 is connected with the positive power supply Vcc, the positive electrode of the diode D3 and the other end of the capacitor C3 are connected with the public end V0, the other end of the capacitor C4 is connected with the public end V0, the other end of the transformer LC is connected with the inductor L3, the other end of the inductor LC is connected with the positive electrode of the diode D6, the negative electrode of the diode D5, the capacitor C5 and the positive input end of the operational amplifier follower U2C, the negative input end of the operational amplifier follower U2C is connected with the output end of the operational amplifier follower U2C, the resistor R3 and the capacitor C6 enter the singlechip chip MCU, the negative electrode of the diode D6 is connected with the positive power supply Vcc, the positive electrode of the diode D5 and the other end of the capacitor C5 are connected with the public end V0, the other end of the capacitor C6 is connected with the public end V0, the singlechip chip MCU output control connection resistor JR1, the other end of the resistor JR1 is connected with the base electrode of the triode JBG1, the collector of the triode JBG1 is connected with the contactor JQ1 coil, the positive electrode of the diode JD1 and the negative electrode of the electrolytic capacitor JC1, the other end of the contactor JQ1 coil, the cathode of the diode JD1 and the anode of the capacitor JC1 are connected with a positive power supply 12V, the emitter of the triode JBG is connected with a public end V0, one end of a start button QA is connected with a singlechip chip MCU, one end of a stop button QT is connected with the singlechip chip MCU, and the other ends of the start button QA and the stop button QT are connected with the public end V0.

Fig. 3-4 are exterior views of the main housing and display housing of the electrical safety smart protective device.

The structure of the main shell and the display of the electric safety intelligent protection device and the structure of the motor multifunctional protection device are arranged in the same shell, and data are displayed on the same display, the structure of the main shell and the display is formed by connecting and fixing an upper shell (2) and a lower shell (1) into a whole through a main shell connecting screw hole (3) and a main shell fixing screw hole by fixing screws, a circuit board is respectively and fixedly arranged in the main shell, a first connecting terminal plug seat (8), a second connecting terminal plug seat (9), a third connecting terminal plug seat (10), a fourth connecting terminal plug seat (11), a fifth connecting terminal plug seat (12), a sixth connecting terminal plug seat (13), a seventh connecting terminal plug seat (14) and an eighth connecting terminal plug seat (15) on the circuit board are respectively and compactly arranged on two sides of the main shell, and the structure of the display is mainly composed of a display shell (16), a display screen (17) and a fixing buckle (18) on the main shell.

Claims (3)

1. An intelligent protector for electric safety is composed of a current detecting and protecting circuit for three-phase unidirectional pulse sine wave motor, a main casing, and a display, and features that a temp sensor is additionally arranged on the terminal for protecting the terminal, a single-chip microcomputer is used to cut off the power supply when the temp of terminal exceeds a predefined value, the temp sensor RF1 is closely attached to the power supply terminal A1, the temp sensor RF2 is closely attached to the power supply terminal B1, the temp sensor RF3 is closely attached to the power supply terminal C1, the temp sensor RF4 is closely attached to the motor terminal A2, the temp sensor RF5 is closely attached to the motor terminal B2, the temp sensor RF6 is closely attached to the motor terminal C2 for respectively detecting the temp of each terminal, the detection result enters the MCU processing of the singlechip chip, if the heating of one wiring terminal exceeds a specified value due to overlarge current or poor contact, the contactor JQ1 is controlled to be disconnected, fire disaster or other accidents can be effectively avoided, the circuit structure is that 6 identical temperature detection circuits respectively detect 6 wiring terminals, one temperature detection circuit is that the temperature detection circuit of the power supply inlet wiring terminal A1 is that the temperature sensor RF1 is tightly attached to the power supply inlet wiring terminal A1, the temperature sensor RF1 is connected with the resistor RF7, the resistor RF8 and the capacitor CF1, the other end of the resistor RF7 is connected with the positive power supply Vcc, the other end of the resistor RF8 is connected with the capacitor CF2 and the MCU chip, the other ends of the temperature sensor RF1, the capacitor CF1 and the capacitor CF2 are connected with the common end V0, the connection terminal A, the connection terminal B, the connection terminal Jb and the connection terminal C are connected to the contactor JQ1, and the connection terminal skeleton (19) is fixed by screws through the connection terminal skeleton fixing holes (20).

2. The electric safety intelligent protection device according to claim 1, wherein the three-phase unidirectional pulsation sine wave motor current detection protection circuit and the electric safety intelligent protection device are installed in the same shell, a positive voltage is applied to the split transformer LA, the transformer LB and the transformer LC central line, three-phase unidirectional pulsation sine wave current signals are respectively obtained during detection sampling, the working principle is that positive voltage values divided by a resistor R4 and a resistor R5 are applied to a positive voltage on the central line of the transformer LA, the transformer LB and the transformer LC through the output of an operational amplification follower U2D, motor working currents detected through the three-phase transformer are respectively output three-phase unidirectional pulsation sine wave current signals through the operational amplification follower U2A, the operational amplification follower U2B and the operational amplification follower U2C, each phase is detected by a simple circuit of the operational amplification follower, and enters a singlechip chip MCU, the singlechip chip MCU controls a contactor JQ1 to perform overcurrent overload, short-circuit, phase loss and unbalanced protection, the contactor JQ2, the contactor JQ3 and the contactor JQ4 are connected with a power supply terminal A through a connection terminal B3, a connection terminal B is connected with the other end of the power supply terminal B1, a connection terminal B is connected with the power supply terminal B3, the connection terminal B is connected with the power supply terminal B1, the connection terminal B is connected with the connection terminal B3, the connection terminal B is connected with the connection terminal B1 through the connection terminal B1, the motor A is connected with the motor outgoing line connecting terminal A2 through the mutual inductor LA, the motor B is connected with the motor outgoing line connecting terminal B2 through the mutual inductor LB, the motor C is connected with the motor outgoing line connecting terminal C2 through the mutual inductor LC, the motor outgoing line connecting terminal A2, the motor outgoing line connecting terminal B2 and the motor outgoing line connecting terminal C2 are connected with the motor M, the resistor R4 is connected with the resistor R5, the capacitor C8 and the positive input end of the operational amplifier follower U2D, the other end of the resistor R4 is connected with the positive power Vcc, the resistor R5 and the other end of the capacitor C8 are connected with the common end V0, the negative input end of the operational amplifier follower U2D is connected with the output end of the operational amplifier follower U2D, the positive electrode of the diode D8, the negative electrode of the capacitor C7, the capacitor C7 and the inductor L4 are connected with the positive power Vcc, the positive electrode of the diode D7 is connected with the positive power C1, the negative electrode of the mutual inductor L1 is connected with the positive end of the mutual inductor C2, the negative end of the mutual inductor L1 is connected with the negative end of the mutual inductor C2, one end of the mutual inductor LA is connected with one end of the mutual inductor LC is connected with the positive end of the mutual inductor L7, one end of the mutual inductor L1 is connected with one end of the mutual inductor L2, one end of the mutual inductor L1 is connected with the mutual inductor L2, the positive end of the mutual inductor L1 is connected with the negative end of the mutual inductor C1, the negative end of the mutual inductor C1 is connected with the negative end of the mutual inductor C1, the positive end of the mutual inductor C1, the negative end, the mutual inductor C1, the mutual inductor, the C2, the mutual inductor C and the C2, and the C2 the C, the other end of the inductor L2 is connected with the positive electrode of the diode D4, the negative electrode of the diode D3, the capacitor C3 and the positive input end of the operational amplifier follower U2B, the negative input end of the operational amplifier follower U2B is connected with the output end of the operational amplifier follower U2B, the resistor R2 and the capacitor C4 enter the singlechip chip MCU, the negative electrode of the diode D4 is connected with the positive power Vcc, the positive electrode of the diode D3 and the other end of the capacitor C3 are connected with the common end V0, the other end of the capacitor C4 is connected with the common end V0, the other end of the transformer LC is connected with the inductor L3, the other end of the inductor LC is connected with the positive electrode of the diode D6, the negative electrode of the diode D5, the capacitor C5 and the positive input end of the operational amplifier follower U2C, the negative input end of the operational amplifier follower U2C is connected with the output end of the operational amplifier follower U2C, the resistor R3 and the capacitor C6 enter the singlechip chip MCU, the negative pole of diode D6 connects positive power Vcc, the positive pole of diode D5 and the other end of condenser C5 connect public end V0, public end V0 is connected to the other end of condenser C6, singlechip chip MCU output control connection resistance JR1, triode JBG 1's base is connected to resistance JR1 other end, triode JBG 1's collecting electrode connects contactor JQ1 coil, diode JD 1's positive pole and electrolytic capacitor JC1 negative pole, contactor JQ 1's the other end, diode JD 1's negative pole and condenser JC 1's positive pole connect positive power 12V, triode JBG 1's projecting pole connects public end V0, start button QA one end is connected singlechip chip MCU, singlechip chip MCU is connected to stop button QT one end, start button QA and stop button QT's the other end is connected public end V0.

3. The electric safety intelligent protection device according to claim 1, wherein the main housing and the display of the electric safety intelligent protection device are arranged in the same housing and display data are displayed on the same display, the main housing and the display are formed by connecting and fixing an upper housing (2) and a lower housing (1) together through a main housing connecting screw hole (3) and a main housing fixing screw hole by fixing screws, a circuit board is respectively and fixedly arranged in the main housing, a first connecting terminal plug (8), a second connecting terminal plug (9), a third connecting terminal plug (10), a fourth connecting terminal plug (11), a fifth connecting terminal plug (12), a sixth connecting terminal plug (13), a seventh connecting terminal plug (14) and an eighth connecting terminal plug (15) on the circuit board are respectively and compactly arranged on two sides of the main housing, and a connecting socket (6) and a function indicating lamp (5) of the display are also exposed on the main housing, and the display mainly comprises a display housing (16), a display screen (17) and a fixing buckle (18).