WO2014194779A1

WO2014194779A1 - Measurement device for full-shielding high-voltage current

Info

Publication number: WO2014194779A1
Application number: PCT/CN2014/078484
Authority: WO
Inventors: 王伟; 白剑忠; 卢峰超; 郭末凯; 刘婕; 齐梦倩
Original assignee: 国家电网公司; 国网河北省电力公司检修分公司
Priority date: 2013-06-03
Filing date: 2014-05-27
Publication date: 2014-12-11
Also published as: CN103336160B; CN103336160A

Abstract

A measurement device for a full-shielding high-voltage current comprises a left shell (2) and a right shell (3) forming a ring-shaped shielding chamber (1); a test core line hole (4) is arranged at a top end of the right shell (3), and a switching hole (5) for accommodating a pressing switching mechanism is arranged at a bottom end of the right shell (3), and an infrared hole (6) for letting through an infrared ray and a push rod hole (7) for letting through a first push rod (11) of the pressing switching mechanism are arranged on an inner ring wall of the ring-shaped shielding chamber (1), and the push rod hole (7) is located right above the switching hole (5); a ring-shaped printed circuit board with a detected signal analysis and processing circuit is arranged inside of the ring-shaped shielding chamber (1), and a circular printed circuit board with a detected signal transmission circuit is arranged inside a space surrounded by the inner ring wall of the ring-shaped shielding chamber (1). Through full shielding and electrical independence, the measurement device can measure a high*voltage current conveniently, securely, reliably and accurately, can send test data remotely, eliminate the inconvenience and hidden troubles caused by human eye reading, avoid the occupation of personnel and improve the working efficiency.

Description

Fully shielded high voltage current measuring device

[0001] The present invention relates to a fully shielded high voltage current measuring device, which belongs to the field of high voltage power equipment measurement.

Background technique

[0002] At present, in the test of high-voltage power equipment, when the test data is read from the high-voltage end, a high-voltage measuring device must be used. Due to the limitation of the high-voltage end electric field, the measuring circuit or the related meter must be in the fully shielded metal shell. Work, and it is impossible to transfer data from the fully shielded environment with electromagnetic waves, which leads to the following problems:

1. The input, measurement and display of most of the high-voltage current measuring devices used are completed at the high voltage end. The tester reads the high-voltage display value by the human eye, and receives many factors such as on-site light, tester's vision, safety distance and so on. The impact is inconvenient for the user to read the data. There is a safety hazard when reading the measured value from the high voltage side. At the same time, the test team has to set a reading for one person, which reduces the work efficiency.

[0003] 2. There are products that use optical fibers to transmit signals to the low-voltage zone. This method is not a true full-shield measurement. It is also affected by the temperature and humidity of the working environment and the insulation properties of the fiber material, which limits the scope of use. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-voltage current measuring device that is convenient, safe, reliable, and capable of ensuring full-shielded measurement accuracy, and can transmit test data over long distances, thereby eliminating inconvenience caused by human eye readings. Hidden dangers, avoiding people and improving work efficiency.

[0005] The technical solution adopted by the present invention to solve the technical problem thereof:

The invention includes a left casing and a right casing constituting a circular ring shielding chamber, the left casing and the right casing being screwed; a test core hole is provided at a top end of the right casing, at the right The bottom end of the casing is provided with a switch hole for pressing the switch mechanism, and an inner wall of the annular shield chamber is provided with an infrared hole for passing through the infrared rays and a push of the first push rod passing through the push switch mechanism. a rod hole, the push rod hole is located directly above the switch hole; a circular printed circuit board is arranged in the annular shielding chamber, and is surrounded by an inner ring wall of the circular shielding chamber a circular printed circuit board is disposed in the space; a shielding layer is disposed on the infrared ray hole, and a baffle is disposed at two ports of the inner ring wall of the circular shielding chamber;

The push switch mechanism includes a conductive metal piece, a spring, a first push rod, a second push rod and a spring limit sleeve; the conductive metal piece covers the switch hole; the spring end is fixed on the conductive metal piece, The other end is connected to the lower end of the second push rod, and the first push rod is fixed on the second push rod;

The measuring device further comprises a measured signal analysis processing circuit mounted on the circular printed circuit board and a measured signal transmitting circuit mounted on the circular printed circuit board;

The measured signal analysis processing circuit comprises a first power voltage stabilizing circuit, a signal sampling and filtering circuit to be tested, a first single chip processing circuit and an infrared transmitting circuit; the measured signal transmitting circuit comprises a second power voltage stabilizing circuit, and an infrared a receiving circuit, a second single chip processing circuit and a wireless data transmission circuit;

The measured signal sampling and filtering circuit is connected to the infrared transmitting circuit by the first single chip processing circuit, and the corresponding output end of the first power voltage stabilizing circuit is respectively connected to the corresponding input end of the first single chip processing circuit and the infrared transmitting circuit; The infrared receiving circuit is connected to the wireless data transmission circuit by the second single chip processing circuit, and the corresponding output end of the second power voltage stabilizing circuit is respectively connected to the corresponding input end of the second single chip processing circuit and the infrared receiving circuit; the infrared transmitting circuit and the infrared The receiving circuit transmits an infrared signal through an infrared hole on the inner ring wall of the annular shielding chamber.

[0006] The first power voltage stabilizing circuit includes a voltage regulator chip U2 and its peripheral component capacitors C7~C9, resistors R11~R12, a switch K1 and a battery E1; the battery El positive terminal is connected to the voltage regulator chip via the switch K1. 1 pin of U2, the negative pole of battery E1 is grounded; the capacitor C8 is connected between pin 1 and pin 2 of the voltage regulator chip U2, and the pin 1 and pin 3 of the regulator chip U2 are connected, the stable The pin 2 of the voltage chip U2 is grounded, and the capacitor C9 is connected between the 5 pin of the voltage regulator chip U2 and the ground; the pin 1 of the voltage regulator chip U2 is +4.2V, and the 5 pin is +3.3V. The capacitor C7 is connected in parallel with the resistor R11 and connected in series with R12, and then connected between +4.2V and ground; the second power supply voltage stabilizing circuit includes a voltage regulator chip U4 and its peripheral component capacitors C10~C11, C14, Resistor R13~R14, switch K2 and battery E2; the second power voltage stabilizing circuit and the first power stabilizing circuit have the same structure; the first push rod and the second push rod respectively control the first power voltage stabilizing circuit and The switches K1 and Κ2 of the second power voltage regulator circuit;

The signal filtering and voltage stabilizing circuit of the measured signal comprises a fuse F1, a bidirectional breakdown diode D1, resistors R1 R R8, capacitors C1 C C4, an operational amplifier IC1 IC2 and an interface J1; the measured signal passes through the test core hole and The switch holes are respectively connected to pins 1 and 2 of the interface J1; the pin 1 of the interface J1 is sequentially connected to the pin 2 of the interface J1 via the fuse F1 and the bidirectional breakdown diode D1; the pin 2 of the interface J1 is grounded; The resistors 1-R2 are connected in series and connected to the two ends of the bidirectional breakdown diode D1; the resistor R1 and the node of the bidirectional breakdown diode D1 are connected to the non-inverting input terminal of the operational amplifier IC1 through the resistors R3, R5 and R7 in sequence; the resistor R1 a node with R2 is connected to the non-inverting input terminal of the operational amplifier IC2 via resistors R4, R6, and R8; The nodes of the resistors R3 and R5 are grounded via a capacitor C1, the nodes of the resistors R5 and R7 are grounded via a capacitor C3, the nodes of the resistors R4 and R6 are grounded via a capacitor C2, and the nodes of the resistors R6 and R8 are grounded via a capacitor C4; An output end of the operational amplifier IC1 is connected to an inverting input end thereof, and an output end of the operational amplifier IC2 is connected to an inverting input end thereof;

The first single chip processing circuit comprises a single chip U1 and its peripheral component capacitor C5 C6; the capacitor C5 is connected between +3.3 V and the 9 pin of the single chip U1, and the capacitor C6 is connected to +3.3 V and the U1 of the single chip U1 Between the feet; 1~2 pins of the single chip U1 are respectively connected to the output end of the operational amplifier IC1 IC2; the 3 pin of the single chip U1 is connected to the node of the resistor R11 R12; the 4~9, 22 feet of the single chip U1 are grounded , 10, 21 feet connected +3.3V;

The infrared emitting circuit comprises an LED infrared light emitting diode, a resistor R9~R10, and a triode Q1; the LED infrared light emitting diode and the resistor R9 are connected in series between the +3.3V and the collector of the transistor Q1, and the base of the transistor Q1 The pole resistor R10 is connected to the 17 pin of the single chip U1, and the emitter of the transistor Q1 is grounded;

The infrared receiving circuit includes an infrared receiver, a resistor R15, a capacitor C15, and an interface J2. The infrared receiver is connected to the interface J2. The resistor R15 and the capacitor C15 are connected in series and connected between +3.3V and ground. The node of the resistor R15 and the capacitor C15 is connected to the 3 pin of the interface J2, and the 2 pin of the interface J2 is grounded; the two sides of the infrared hole (6) on the inner ring wall of the annular shielding chamber (1) are respectively Corresponding placement of LED infrared light emitting diodes and infrared receivers;

The second single chip processing circuit comprises a single chip U3 and its peripheral component capacitor C12 C13; the second single chip processing circuit has the same structure as the first single chip processing circuit; the 18 pin of the single chip U3 is connected to the J2 pin 1;

The wireless data transmission circuit includes a wireless transmission chip U5 and its peripheral component capacitor C16; the feet of the wireless transmission chip U5 are respectively connected to the pins 20, 16, 13-15, 19 of the single chip U3, and the capacitor C16 is connected. Between the pin 1 of the wireless transmission chip U5 and the ground, the pin 1 of the wireless transmission chip U5 is connected to +3.3 V, and the pin 8 of the wireless transmission chip U5 is grounded.

[0007] The model of the operational amplifier IC1 IC2 is LM358; the model of the single-chip microcomputer U1, U3 is C8051F50/2; the model of the voltage regulator chip U2, U4 is SP6201; the model of the infrared receiver is TSOP34838 The model of the wireless transmission chip U5 is PTR6000M, 2.4G; the model of the battery El, E2 is a 16340 lithium battery. The positive effects produced by the present invention are as follows:

(1) The present invention utilizes the infrared signal propagation mode different from the characteristics of the electromagnetic wave, and transmits the measurement data from the annular shielding chamber, and the measurement data is enclosed in the inner annular wall of the unshielded annular shielding chamber 1. In the space, the second transmission is carried out in the form of radio frequency. While ensuring the measurement accuracy under the full shielding environment, the receiving device is finally used to realize the remote omnidirectional receiving display, and the data of the high-voltage end is read by the human eye in the past, so that the whole experiment is performed. During the process, the tester does not have to be close to the high-voltage end to avoid the potential safety hazard, improve the work efficiency, and avoid the potential risk of reading the high-voltage data while ensuring the accuracy;

(2) The first and second power supply voltage regulator circuits are used indoors and outdoors in the annular shielding cavity to realize independent dual power supply; the push switch mechanism is used to simultaneously control the on and off of the indoor and outdoor power supply of the circular shielding cavity, in the housing, The external circuit is electrically completely isolated.

DRAWINGS

1 is a block diagram of a circuit principle of the present invention;

Figure 2 is a front elevational view of the present invention;

Figure 3 is a left side view of the present invention;

Figure 4 is a cross-sectional view taken along line A-A of the present invention;

Figure 5 is a circuit schematic diagram of a circular printed circuit board in the present invention;

Figure 6 is a circuit schematic diagram of a circular printed circuit board of the present invention.

[0010] wherein, 1 annular shielding chamber, 2 left housing, 3 right housing, 4 test core hole, 5 switch hole, 6 infrared hole, 7 push rod hole, 8 baffle, 9 conductive metal sheet , 10 springs, 11 first push rods, 12 second push rods, 13 spring positioning sleeves.

detailed description

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

It can be seen from the embodiment shown in FIGS. 1 to 6 that it comprises a left casing 2 and a right casing 3 constituting the annular shielding chamber 1, and the left casing 2 and the right casing 3 are screwed together; a test core hole 4 is disposed at a top end of the right casing 3, and a switch hole 5 having a push switch mechanism is disposed at a bottom end of the right casing 3, and is disposed on an inner ring wall of the annular shield chamber 1 There is an infrared ray hole 6 for passing through the infrared ray and a push rod hole 7 passing through the first push rod 11 of the push switch mechanism, the push rod hole 7 being located directly above the switch hole 5; in the circular shielded chamber 1 is provided with a circular printed circuit board, a circular printed circuit board is arranged in a space surrounded by the inner ring wall of the circular shielding chamber 1; a shielding layer is arranged on the infrared hole 6 In the circular shield The two ports of the inner ring wall of the chamber 1 are provided with a baffle 8;

The push switch mechanism includes a conductive metal piece 9, a spring 10, a first push rod 11, a second push rod 12, and a spring limit sleeve 13; the conductive metal piece 9 covers the switch hole 5; The 10th end is fixed on the conductive metal piece 9, the other end is connected to the lower end of the second push rod 12, and the first push rod 11 is fixed on the second push rod 12;

The measured signal sampling and filtering circuit is connected to the infrared transmitting circuit by the first single chip processing circuit, and the corresponding output end of the first power voltage stabilizing circuit is respectively connected to the corresponding input end of the first single chip processing circuit and the infrared transmitting circuit; The infrared receiving circuit is connected to the wireless data transmission circuit by the second single chip processing circuit, and the corresponding output end of the second power voltage stabilizing circuit is respectively connected to the corresponding input end of the second single chip processing circuit and the infrared receiving circuit; the infrared transmitting circuit and the infrared The receiving circuit transmits an infrared signal through an infrared hole on the inner ring wall of the annular shielding chamber 1.

[0012] The first power voltage stabilizing circuit comprises a voltage regulator chip U2 and its peripheral component capacitors C7~C9, resistors R11~R12, a switch K1 and a battery E1; the battery El positive electrode is connected to the voltage regulator chip via the switch K1 1 pin of U2, the negative pole of battery E1 is grounded; the capacitor C8 is connected between pin 1 and pin 2 of the voltage regulator chip U2, and the pin 1 and pin 3 of the regulator chip U2 are connected, the stable The pin 2 of the voltage chip U2 is grounded, and the capacitor C9 is connected between the 5 pin of the voltage regulator chip U2 and the ground; the pin 1 of the voltage regulator chip U2 is +4.2V, and the 5 pin is +3.3V. The capacitor C7 is connected in parallel with the resistor R11 and connected in series with R12, and then connected between +4.2V and ground; the second power supply voltage stabilizing circuit includes a voltage regulator chip U4 and its peripheral component capacitors C10~C11, C14, The resistors R13~R14, the switch K2 and the battery E2; the second power voltage stabilizing circuit and the first power voltage stabilizing circuit have the same structure; the first push rod 11 and the second push rod 12 respectively control the first power voltage regulator a circuit and a second power supply voltage regulator switch K1 and Κ 2;

The signal filtering and voltage stabilizing circuit of the measured signal comprises a fuse F1, a bidirectional breakdown diode D1, resistors R1 R R8, capacitors C1 C C4, an operational amplifier IC1 IC2 and an interface J1; the measured signal passes through the test core hole 4 And the switch hole 5 is respectively connected to the 1st pin and the 2 pin of the interface J1; the pin 1 of the interface J1 is sequentially passed through the fuse Fl, The bidirectional breakdown diode D1 is connected to the 2 pin of the interface J1; the 2 pin of the interface J1 is grounded; the resistor R1 R2 is connected in series to the two ends of the bidirectional breakdown diode D1; the resistor R1 and the bidirectional breakdown diode D1 The nodes are connected to the non-inverting input terminals of the operational amplifier ICl via resistors R3, R5, and R7; the nodes of the resistors R1 and R2 are sequentially connected to the non-inverting input terminals of the operational amplifier IC2 via resistors R4, R6, and R8; the resistors R3 and R5. The node is grounded via a capacitor C1, the nodes of the resistors R5 and R7 are grounded via a capacitor C3, the nodes of the resistors R4 and R6 are grounded via a capacitor C2, and the nodes of the resistors R6 and R8 are grounded via a capacitor C4; the operational amplifier The output of IC1 is connected to its inverting input, and the output of the operational amplifier IC2 is connected to its inverting input;

The infrared receiving circuit includes an infrared receiver, a resistor R15, a capacitor C15, and an interface J2. The infrared receiver is connected to the interface J2. The resistor R15 and the capacitor C15 are connected in series and connected between +3.3V and ground. The node of the resistor R15 and the capacitor C15 is connected to the 3 pin of the interface J2, and the 2 pin of the interface J2 is grounded; the two sides of the infrared hole 6 on the inner ring wall of the annular shielding chamber 1 are respectively placed with the LED infrared Light emitting diode and infrared receiver;

The wireless data transmission circuit includes a wireless transmission chip U5 and its peripheral component capacitor C16; the feet of the wireless transmission chip U5 are respectively connected to the pins 20, 16, 13-15, 19 of the single chip U3, and the capacitor C16 is connected. Between the pin 1 of the wireless transmission chip U5 and the ground, the pin 1 of the wireless transmission chip U5 is connected to +3.3 V, and the pin 8 of the wireless transmission chip U5 is grounded. [0013] The model of the operational amplifier IC1 IC2 is LM358; the model of the single-chip microcomputer U1, U3 is C8051F50/2; the model of the voltage regulator chip U2, U4 is SP6201; the model of the infrared receiver is TSOP34838 The model of the wireless transmission chip U5 is PTR6000M, 2.4G; the model of the battery El, E2 is a 16340 lithium battery.

[0014] The working principle of the invention:

The toroidal shielding chamber is used to package the signal analysis and processing circuit to be tested, and the circular shielding chamber can effectively eliminate the corona. The shielding material of the metal material makes the signal analysis and processing circuit under test not affected by the high electric field during operation;

The pin 2 of the interface J1 is connected to the switch hole 5, and the switch hole 5 is connected to the high voltage generator via a threaded columnar metal connecting member at one end, and then the negative high voltage is input from the 2 pin of the interface J1, and then passes through the ground and the resistor in turn. After R2~R1 and fuse F1, the test piece of the arrester, transformer, insulator, etc., which is tested by the shield wire in the test core hole 4 is output from the 1 pin of the interface J1, and the current is generated on the resistor R1 R2. After falling through the RC filter network, after the voltage of the operational amplifier follows, it is collected and processed by the first single chip processing circuit, and then the infrared modulation signal is sent through the infrared transmitting circuit, and the data received by the infrared receiving circuit is collected and processed by the second single chip processing circuit. The second single chip processing circuit controls the wireless data transmission circuit to transmit the received data as a high frequency signal and is received by the remote device and displayed on the liquid crystal screen; the wireless transmitting circuit is enclosed by the inner ring wall of the circular shielding chamber 1 In the space, the advantage of this design is, first, to make high-frequency electromagnetic waves can be emitted, because high The electromagnetic wave is shielded from being emitted in the annular shielding chamber 1 and cannot be emitted. Second, the inner ring wall of the circular shielding chamber 1 has a high potential at the center of the space, but the electric field strength is small, and the transmitting circuit can be prevented. The discharge is damaged.

[0015] The infrared ray hole 6 is provided with a shielding layer, which can be made of conductive glass, because the infrared ray can pass through the conductive glass, but the electromagnetic wave cannot pass through the conductive glass, so the inside and outside of the circular shielding chamber 1 exchanges data through infrared rays in the ring. The infrared ray holes 6 on the inner ring wall of the shielding chamber 1 are respectively disposed with LED infrared light emitting diodes and infrared receivers on the inner and outer sides, so that signals are transmitted from the inside of the circular shielding chamber 1.

[0016] The left and right housings may be aluminum housings.

[0017] The first power supply voltage stabilization circuit and the second power supply voltage stabilization circuit are respectively used inside and outside the annular shielding chamber 1 to realize dual power supply independence; the push switch mechanism simultaneously controls the circular shielding chamber 1 The internal and external power supply are turned on and off, and the internal and external double switches operate synchronously, that is, the internal and external circuits of the housing are completely electrically independent. [0018] The method of use of the invention:

First, the columnar metal connecting member fixed on the high voltage generator is connected to the switch hole 5 on the measuring device of the fully shielded high voltage current, and the test core hole 4 is connected to the arrester and the transformer to be tested through the shielded wire. On the test piece such as insulator, start measurement and initialize the equipment;

Then, the measured and processed data is transmitted to the wireless receiving device held by the worker in the low voltage region by the 2.4G high frequency electromagnetic wave by the fully shielded high voltage current measuring device.

Claims

Claim

A measuring device for fully shielding a high-voltage current, characterized by comprising a left casing (2), a right casing (3) constituting a circular shielding chamber (1), and the left casing (2) and a right casing (3) is threadedly connected; a test core wire hole (4) is disposed at a top end of the right casing (3), and a switch hole with a pressing switch mechanism is disposed at a bottom end of the right casing (3) (5) an infrared hole (6) for passing through the infrared ray and a push rod passing through the first push rod (11) of the push switch mechanism are provided on the inner ring wall of the annular shielding chamber (1) a hole (7), the push rod hole (7) is located directly above the switch hole (5); a circular printed circuit board is mounted in the circular shield chamber (1), in the ring a circular printed circuit board is disposed in a space surrounded by an inner ring wall of the shielded chamber (1); a shielding layer is disposed on the infrared hole (6), and the annular shielding chamber (1) The two ports of the inner ring wall are provided with a baffle (8);

The push switch mechanism comprises a conductive metal piece (9), a spring (10), a first push rod (11), a second push rod (12) and a spring limit sleeve (13); the conductive metal piece (9) Covering the switch hole (5); the spring (10) is fixed on the conductive metal piece (9), and the other end is connected to the lower end of the second push rod (12), the first push rod ( 11) fixed on the second push rod (12);

The measured signal analysis processing circuit comprises a first power voltage stabilization circuit, a signal sampling and filtering circuit to be tested, a first single chip processing circuit and an infrared transmitting circuit; the measured signal transmitting circuit comprises a second power voltage stabilizing circuit and infrared a receiving circuit, a second single chip processing circuit and a wireless data transmission circuit;

The measured signal sampling and filtering circuit is connected to the infrared transmitting circuit by the first single chip processing circuit, and the corresponding output end of the first power voltage stabilizing circuit is respectively connected to the corresponding input end of the first single chip processing circuit and the infrared transmitting circuit; The infrared receiving circuit is connected to the wireless data transmission circuit by the second single chip processing circuit, and the corresponding output end of the second power voltage stabilizing circuit is respectively connected to the corresponding input end of the second single chip processing circuit and the infrared receiving circuit; the infrared transmitting circuit and the infrared The receiving circuit transmits an infrared signal through an infrared hole on the inner ring wall of the annular shielding chamber (1).

2 . The apparatus of claim 1 , wherein the first power voltage regulator circuit comprises a voltage regulator chip U2 and peripheral component capacitors C7~C9, resistors R11~R12, and switch K1. And the battery E1; the battery E1 positive electrode is connected to the pin 1 of the voltage regulator chip U2 via the switch K1, the negative electrode of the battery E1 is grounded; the capacitor C8 is connected between the 1 pin and the 2 pin of the voltage regulator chip U2, The pin 1 and the 3 pin of the voltage regulator chip U2 are connected, the pin 2 of the voltage regulator chip U2 is grounded, and the capacitor C9 is connected between the 5 pin of the voltage regulator chip U2 and the ground; The pin 1 of the chip U2 is +4.2V, and the 5 pin is +3.3V; the capacitor C7 is connected in parallel with the resistor R11 and connected in series with R12, and then connected between +4.2V and ground; the second power supply voltage stabilizing circuit The voltage regulator chip U4 and its peripheral component capacitors C10~C11, C14, the resistor R13-R14, the switch K2 and the battery E2; the second power voltage stabilizing circuit and the first power voltage stabilizing circuit have the same structure; The first push rod (11) and the second push rod (12) respectively control the switches K1 and K2 of the first power voltage stabilizing circuit and the second power voltage stabilizing circuit;

The signal filtering and voltage stabilizing circuit of the measured signal comprises a fuse F1, a bidirectional breakdown diode D1, resistors R1 R R8, capacitors C1 C C4, an operational amplifier IC1 IC2 and an interface J1; the measured signal passes through the test core hole ( 4) and the switch hole (5) are respectively connected to the 1st and 2nd pins of the interface J1; the 1st leg of the interface J1 is sequentially connected to the 2nd leg of the interface J1 via the fuse F1 and the bidirectional breakdown diode D1; the interface J1 The two legs are grounded; the resistor R1 R2 is connected in series to the two-way breakdown diode D1; the resistor R1 and the node of the bidirectional breakdown diode D1 are connected to the non-inverting input terminal of the operational amplifier IC1 via the resistors R3, R5 and R7. The nodes of the resistors R1 and R2 are connected to the non-inverting input terminals of the operational amplifier IC2 via resistors R4, R6, and R8; the nodes of the resistors R3 and R5 are grounded via a capacitor C1, and the nodes of the resistors R5 and R7 pass through a capacitor C3. Grounding, the nodes of the resistors R4 and R6 are grounded via a capacitor C2, the nodes of the resistors R6 and R8 are grounded via a capacitor C4; the output of the operational amplifier IC1 is connected to an inverting input thereof, the operational amplifier IC2 Output and its inverting input terminal is connected;

The first single chip processing circuit comprises a single chip U1 and its peripheral component capacitor C5 C6; the capacitor C5 is connected between +3.3V and the 9 pin of the single chip U1, and the capacitor C6 is connected to the +3.3V and the U1 of the single chip U1 Between the feet; 1~2 pins of the single chip U1 are respectively connected to the output end of the operational amplifier IC1 IC2; the 3 pin of the single chip U1 is connected to the node of the resistor R11 R12; the 4~9 and 22 feet of the single chip U1 are grounded , 10, 21 feet connected +3.3V;

The infrared emitting circuit comprises an LED infrared light emitting diode, a resistor R9~R10, and a triode Q1; the LED infrared light emitting diode and the resistor R9 are connected in series between the +3.3V and the collector of the transistor Q1, and the base of the transistor Q1 The pole resistor R10 is connected to the 17 pin of the single chip U1, and the emitter of the triode Q1 is grounded;

The second single chip processing circuit comprises a single chip U3 and its peripheral component capacitor C12 C13; the second single chip processing circuit has the same structure as the first single chip processing circuit; the 18 pin of the single chip U3 is connected to the 1 pin of the interface J2; The wireless data transmission circuit includes a wireless transmission chip U5 and its peripheral component capacitor C16; the legs of the wireless transmission chip U5 are respectively connected to the pins 20, 16, 13-15, 19 of the single chip U3, and the capacitor C16 is connected Between the 1 pin of the wireless transmission chip U5 and the ground, the 1st pin of the wireless transmission chip U5 is connected to +3.3V, and the 8 pin of the wireless transmission chip U5 is grounded.

3. The apparatus for measuring a full shielded high voltage current according to claim 2, wherein said operational amplifier IC1 IC2 The model number of the single chip U1, U3 is C8051F50/2; the model of the voltage regulator chip U2, U4 is SP6201; the model of the infrared receiver is TSOP34838; the model of the wireless transmission chip U5 It is a PTR6000M; the model of the batteries El, E2 is a 16340 lithium battery.