CN217505968U - Transformer core grounding current detector with harmonic analysis function - Google Patents

Abstract

The utility model discloses a take harmonic analysis function's transformer core ground current detector relates to electrical measurement equipment technical field. The transformer core grounding current tester with the harmonic analysis function comprises a test host and a pincerlike ammeter, wherein a control panel is arranged on the test host, a power switch is arranged on the control panel, a lithium battery power supply circuit module, a charging port connected to the lithium battery power supply circuit module, a grounding current detection module and a program downloading debugging interface, a current input interface, a power supply and operation indicator lamp, a liquid crystal display and an operation button connected to the grounding current detection module are further arranged on the control panel. The utility model discloses detection that can be convenient detects out on-the-spot transformer core ground current's effective value and harmonic component size, is fit for field work personnel's data analysis work, has avoided the erroneous judgement to data.

Description

Transformer core grounding current detector with harmonic analysis function

Technical Field

The utility model relates to a transformer core ground current detects technical field, specifically is a take transformer core ground current detector of harmonic analysis function.

Background

During the operation of the transformer, the iron core and the clamping piece are in a grounding state. In a normal state, the core grounding current is very small, in an abnormal state, the core grounding current may increase, and when the core grounding current has harmonic current interference, a common core grounding current detection device does not have a harmonic analysis unit part, so that only the total amplitude of the current can be detected, the possibly existing harmonic can not be analyzed, and a worker can not correctly and effectively analyze and process data under a specific condition. On the basis of the original common iron core grounding current detection equipment, the transformer iron core grounding current detector with the harmonic analysis function is improved, a harmonic analysis part is added, the accuracy of equipment detection is ensured, a worker can analyze and process data more thoroughly in the actual detection process, and misjudgment of the data is avoided.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides a take harmonic analysis function's transformer core ground current detector has solved harmonic interference and has leaded to the staff to judge the problem by mistake to transformer core ground current data.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a take harmonic analysis function's transformer core ground current detector, includes test host, pincerlike ampere meter, be provided with current signal input on the test host, the plug electric connection of current signal input pincerlike ampere meter, be provided with power indicator, charging port and switch on the test host, current signal input, power indicator, charging port and switch all with test host electric connection, be provided with liquid crystal display and operation button on the test host, liquid crystal display and operation button all with test host electric connection, be provided with lithium cell power supply circuit module, three-phase electric energy metering module, data processing module, program download debugging interface module in the test host.

Preferably, the lithium battery power supply circuit module comprises a lithium battery BT1, a single-pole single-position switch S1, a switching regulator U5 and a voltage stabilizer U6, wherein the positive electrode of the lithium battery BT1 is connected with a resistor R28, the positive electrode of the lithium battery BT1 is connected with a single-pole single-position switch S1, and the negative electrode of the lithium battery is grounded GND; the other end of the resistor R28 is grounded through a decoupling capacitor C13 and a resistor R29 respectively, and the other end of the single-pole single-position switch S1 is connected with a pin 1 of a switch regulator U5; pin 1 of the switching regulator U5 is grounded through a decoupling capacitor C19; pin 3 and pin 5 of switching regulator U5 are connected to ground; one path of a pin 2 of the switching regulator U5 is grounded through a rectifier diode D5, the other path is connected with a current stabilizing inductor L4, and the other end of the current stabilizing inductor L4 is grounded through a filter capacitor C39; a pin 4 of the switching regulator U5 is grounded through a decoupling capacitor C40 on one path, connected between a filter capacitor C39 and a current stabilizing inductor L4 on the other path, and connected to a pin 3 of a voltage stabilizer U6 on the other path; a pin 4 of the switching regulator U5 outputs direct current VCC voltage, a pin 3 of the voltage stabilizer U6 is grounded GND through a filter capacitor C41 and a decoupling capacitor C20 respectively, a pin 1 of the voltage stabilizer U6 is grounded GND, and a pin 2 of the voltage stabilizer U6 is grounded GND through a decoupling capacitor C21 and a filter capacitor C42 respectively; pin 2 of regulator U6 outputs a dc voltage VCC3.3V.

Preferably, the three-phase electric energy metering module comprises a three-phase electric energy metering chip U3 and a two-pin base J2, wherein a digital ground GND and an analog ground AGND are connected through a zero ohm resistor R35, the pins 1, 3, 10, 11, 18, 20, 21, 25, 30, 31 and 40 of the three-phase electric energy metering chip U3 are connected with the analog ground AGND, the pin 2 and the pin 26 of the three-phase electric energy metering chip U3 are connected with the direct current power supply VCC3.3V through a resistor R20 and an inductor L1, one of the pins is connected with the analog ground through a decoupling capacitor C2 and a filter capacitor C22, the pin 4 of the three-phase electric energy metering chip U3 is connected with the direct current power supply VCC3.3V through a resistor R9 and a decoupling capacitor C32, the pin 5 of the three-phase electric energy metering chip U3 is grounded GND through capacitors C25 and C28, the pin 17 of the three-phase electric energy metering chip U3 is connected with the analog ground AGND through a capacitor C3 and a capacitor C8653, one path of the pin 2 is connected with the pin 2 of the two-pin needle seat J2, the pin 1 of the two-pin needle seat is connected between a resistor R18 and a resistor L2, the pin 23 of the three-phase electric energy metering chip U3 is connected with an analog ground AGND through the resistor R19 and a capacitor C31 respectively, the pin 24 of the three-phase electric energy metering chip U3 is connected with the analog ground ANGD through the capacitor C24 and the capacitor C26 respectively, one path of the pin 27 of the three-phase electric energy metering chip U3 is connected with the analog ground through the resistor R23 and the pin 28 of the crystal oscillator Y2 respectively, and the other path of the pin is connected with the analog ground through the capacitor C25, and the pin 28 of the three-phase electric energy metering chip U3 is connected with the analog ground through the capacitor C24.

Preferably, the data processing module includes a main controller U1, a FLASH memory U4 and a key interface J4, a pin 1 of the main controller U1 is connected to a dc power supply VCC3.3V in one way, a pin is connected to GND in one way through a decoupling capacitor C7, the other end of the decoupling capacitor C7 is connected to the dc power supply VCC3.3V in one way through a capacitor C4 and a resistor R8, a pin 15 of the interface J VCC3.3V is downloaded by a connection program, a pin 5 of the main controller U VCC3.3V is connected to GND in one way through a capacitor C VCC3.3V, a pin 13 of the main controller U VCC3.3V is connected to the pin 6 of the main controller U VCC3.3V through a resistor R VCC3.3V and a crystal oscillator Y VCC3.3V respectively, a pin 6 of the main controller U VCC3.3V is connected to the main controller GND through a capacitor C VCC3.3V, a pin 14 of the main controller U VCC3.3V is connected to GND in one way through a resistor C VCC3.3V and a capacitor C VCC3.3V, a pin 13 of the main controller U VCC3.3V is connected to the dc power supply VCC3.3V through a resistor R VCC3.3V, the main controller U1 is grounded with a GND line, a pin 19 of the main controller U1 is connected with a direct current power supply VCC3.3V, the main controllers U121, 22, 23, 24 and 45 are respectively connected with pins 36, 37, 38, 39 and 4 of a three-phase electric energy metering chip U3, one pin 26 of the main controller U1 is connected with a pin 8 of a FLASH memory U4 through a resistor R25, the other pin is connected with a pin 6 of the FLASH memory U4, one pin 27 of the main controller U1 is connected with a direct current power supply VCC3.3V through a resistor R24, the other pin is connected with a pin 5 of the FLASH memory U4, pins 1, 2, 3, 4 and 7 of the FLASH memory U4 are grounded with a GND line, the main controller U4 is grounded with a decoupling capacitor C11, the pin 28 of the main controller U1 is grounded with a resistor R2, the pin 31 of the FLASH memory U1 is grounded with a pin 32 of the main controller U1, the other pin 32 of the main controller U1 is connected with a capacitor C12, the pin 32 of the direct current power supply U1 is connected with a direct current power supply U6342, the pins U28, the pins U5928, the pins 36, the resistors U599, the pins 37 and the resistors R599 and the pins 36, the resistors R599 and the pins 36 and the pins 9 and the resistors R599 of the pins 9 and the FLASH memory U599 and the pins 9, The resistor R11, the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are connected with a direct current power supply VCC3.3V, one path of the resistor R is respectively connected with pins 1, 2, 3, 4, 5 and 6 of a key interface J4, a pin 7 of a key interface J4 is grounded, one path of a pin 48 of the main controller U1 is connected with a pin 47 of the main controller U1 through a capacitor C10, one path of the pin is connected with the direct current power supply VCC.3V, a pin 47 of the main controller U1 is grounded, a pin 54 of the main controller U1 is connected with the ground through a resistor R16, a diode D1, a diode D2 and a resistor R17, the diode D1 and the diode D2 are connected with the direct current power supply VCC3.3V, a pin 60 of the main controller U1 is connected with the ground through a resistor R1, a pin 64 of a GND 1 is connected with the direct current power supply VCC3.3V, one path of the pin 63 of the main controller U9 is connected with a pin 63 of the main controller U1 through a decoupling capacitor C24, and a pin 63 of the GND 1 is connected with GND.

Preferably, the program download debugging interface module includes a JTAG interface J1 interface, pins 4, 6, 8, 10, 12, 14, 16, 18, and 20 of JTAG interface J1 are grounded to GND, pins 1 and 2 of JTAG interface J1 are connected to dc power vcc3.3v, JTAG interfaces J13, 5, 7, and 13 are connected to pins 56, 50, 46, 49, and 55 of the main controller U1 through resistors R6, R4, R5, and R7, respectively, and pins 3, 5, 7, 9, and 13 of JTAG interface J1 are connected to pins 56, 50, 46, 49, and 55 of the main controller U1, pin 9 of JTAG interface J1 is grounded to GND through resistor R3, pin 15 of JTAG interface J1 is connected between resistor R8 and capacitor C4, and pin 2 of JTAG interface J1 is connected to pin 4 of JTAG interface J1 through capacitor C1.

Preferably, the liquid crystal display module includes liquid crystal display, and liquid crystal display's foot 1 and foot 2 connect DC power VCC, and liquid crystal display's foot 4 connects the foot 16 of main control unit U1, and liquid crystal display's foot 5 and foot 6 connect the foot 17 of main control unit U1, and liquid crystal display's foot 7 and foot 8 ground connection GND.

Preferably, the model of the switching regulator U5 is LM2569-5, the model of the voltage regulator U6 is AS1117, the JTAG interface J1 is a 20-pin interface, the model of the three-phase electric energy metering chip U3 is ADE7878, the model of the main controller U1 is STM32F103RCT, and the model of the FLASH memory U4 is FM24CL 64.

(III) advantageous effects

The utility model provides a take harmonic analysis function's transformer core ground current detector. The method has the following beneficial effects:

(1) this take transformer core ground current detector of harmonic analysis function, through pincerlike ampere meter data acquisition, detection host analysis and display data, the data result is directly perceived clear, has reached the technological effect of simplifying data analysis and judgement.

(2) This take transformer core ground current detector of harmonic analysis function, through pincerlike ampere meter data acquisition, detection host analysis and display data, the data result is directly perceived clear, has reached the technological effect of simplifying data analysis and judgement.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the clamp-on ammeter of the present invention.

Fig. 3 is a circuit diagram of the program downloading and debugging interface of the present invention.

Fig. 4 is a circuit diagram of the data processing module of the present invention.

Fig. 5 is a circuit diagram of the lithium battery power supply circuit module of the present invention.

Fig. 6 is a circuit diagram of the liquid crystal display module of the present invention.

Fig. 7 is a circuit diagram of the three-phase electric energy metering module of the present invention.

In the figure: 1. a test host; 2. a current signal input; 3. a power indicator light; 4. a charging port; 5. a power switch; 6. a liquid crystal display screen; 7. operating a key; 8. a clamp-on ammeter; 81. a clamp body; 82. and (6) a plug.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: a transformer core grounding current detector with a harmonic analysis function comprises a test host 1 and a pincer-shaped ammeter 8, wherein a current signal input end 2 is arranged on the test host 1, a plug 82 of the current signal input end 2 and the pincer-shaped ammeter 8 are electrically connected, a power indicator lamp 3, a charging port 4 and a power switch 5 are arranged on the test host 1, the current signal input end 2, the power indicator lamp 3, the charging port 4 and the power switch 5 are electrically connected with the test host 1, a liquid crystal display screen 6 and an operation key 7 are arranged on the test host 1, the liquid crystal display screen 6 and the operation key 7 are electrically connected with the test host 1, a lithium battery power supply circuit module, a three-phase electric energy metering module, a data processing module and a program downloading and debugging interface module are arranged in the test host 1, and the lithium battery power supply circuit module comprises a lithium battery BT1 and a single-pole single-position switch S1, The switch regulator U5 and the voltage stabilizer U6 are connected, one path of the positive electrode of the lithium battery BT1 is connected with the resistor R28, one path of the positive electrode of the lithium battery is connected with the single-pole single-set switch S1, and the negative electrode of the lithium battery is grounded GND; the other end of the resistor R28 is grounded through a decoupling capacitor C13 and a resistor R29 respectively, and the other end of the single-pole single-position switch S1 is connected with a pin 1 of a switch regulator U5; pin 1 of the switching regulator U5 is grounded through a decoupling capacitor C19; pin 3 and pin 5 of switching regulator U5 are grounded; one path of a pin 2 of the switching regulator U5 is grounded through a rectifier diode D5, the other path is connected with a current stabilizing inductor L4, and the other end of the current stabilizing inductor L4 is grounded through a filter capacitor C39; a pin 4 of the switching regulator U5 is grounded through a decoupling capacitor C40 on one path, connected between a filter capacitor C39 and a current stabilizing inductor L4 on the other path, and connected to a pin 3 of a voltage stabilizer U6 on the other path; a pin 4 of the switching regulator U5 outputs direct current VCC voltage, a pin 3 of the voltage stabilizer U6 is grounded GND through a filter capacitor C41 and a decoupling capacitor C20 respectively, a pin 1 of the voltage stabilizer U6 is grounded GND, and a pin 2 of the voltage stabilizer U6 is grounded GND through a decoupling capacitor C21 and a filter capacitor C42 respectively; a pin 2 of the voltage stabilizer U6 outputs direct current voltage VCC3.3V, the three-phase electric energy metering module comprises a three-phase electric energy metering chip U3 and a two-pin base J2, a digital ground GND and an analog ground AGND are connected through a zero ohm resistor R35, pins 1, 3, 10, 11, 18, 20, 21, 25, 30, 31 and 40 of the three-phase electric energy metering chip U3 are connected with the analog ground AGND, a pin 2 and a pin 26 of the three-phase electric energy metering chip U3 are connected with one path through a resistor R20 and an inductor L1 and then connected with a direct current power supply VCC3.3V, one path is respectively connected with the analog ground through a decoupling capacitor C2 and a filter capacitor C22, a pin 4 of the three-phase electric energy metering chip U3 is respectively connected with a direct current power supply VCC3.3V through a resistor R9 and a decoupling capacitor C32, a pin 5 of the three-phase electric energy metering chip U3 is respectively connected with the ground through a capacitor GND C25 and a C28, a pin 17 of the three-phase electric energy metering chip U3 is respectively connected with the three-phase electric energy metering chip U27 and the three-phase electric energy metering chip ND 27 through a capacitor C27 and the three-phase electric energy metering chip ND 27, one path is connected with a pin 2 of a two-pin base J2, a pin 1 of the two-pin base is connected between a resistor R18 and a resistor L2, a pin 23 of a three-phase electric energy metering chip U3 is respectively connected with an analog ground AGND through a resistor R19 and a capacitor C31, a pin 24 of the three-phase electric energy metering chip U3 is respectively connected with an analog ground ANGD through a capacitor C24 and a capacitor C26, one path of a pin 27 of the three-phase electric energy metering chip U3 is respectively connected with the analog ground ANGD through a resistor R23 and a pin 28 of a crystal oscillator Y2, one path of the pin is connected with the analog ground through a capacitor C25, a pin 28 of the three-phase electric energy metering chip U3 is connected with the analog ground through a capacitor C24, the data processing module comprises a main controller U1, a FLASH memory U1 and a key interface 1, the pin 1 of the main controller U1 is connected with a direct current power supply 1, one path is connected with a decoupling capacitor C1 through the decoupling capacitor C1, the other path of the decoupling capacitor C1 is connected with the direct current supply 1, one path of the pin 1, the pin of the pin is connected with the GND of the pin 72 through the GND of the pin 72 and the GND of the program J1, one path is connected with a pin 6 of a main controller U1 through a resistor R22 and a crystal oscillator Y1 respectively, the pin 6 of the main controller U1 is grounded GND through a capacitor C30, the pin 12 of the main controller U1 is grounded GND, one path of a pin 13 of the main controller U1 is grounded GND through a decoupling capacitor C5 and a capacitor C23 respectively, one path is connected with a direct current power supply VCC3.3V through a resistor R21, the pin 14 of the main controller U1 is connected with a pin 1 of a lithium battery J6 through a resistor R28, one path of a pin 18 of the main controller U1 is connected with a pin 19 of the main controller U1 through a capacitor C16, one path is grounded GND, the pin 19 of the main controller U1 is connected with the direct current power supply VCC3.3V, the main controllers U121, 22, 23, 24 and 45 are connected with pins 36, 37, 38, 39 and 4 of a three-phase electric energy metering chip U VCC3.3V respectively, the pin 26 of the main controller U VCC3.3V is connected with a pin 8 of a FLASH memory U VCC3.3V through a resistor R VCC3.3V, one path is connected with a pin 8 of the FLASH memory U VCC3.3V, and one path is connected with a pin VCC3.3V of the direct current power supply VCC3.3V, one path is connected with a pin 5 of a FLASH memory U4, pins 1, 2, 3, 4 and 7 of the FLASH memory U4 are grounded GND, a pin 8 of the FLASH memory U4 is grounded GND through a decoupling capacitor C11, a pin 28 of a main controller U1 is grounded GND through a resistor R2, a pin 31 of the main controller U1 is grounded GND, one path is connected with a pin 32 of the main controller U1 through a capacitor C12, the pin 32 of the main controller U1 is connected with a direct current power supply VCC3.3V, pins 33, 34, 35, 36, 37 and 38 of the main controller U1 are grounded through resistors R10, R11, R12, R13, a resistor R14 and a resistor R15 respectively, one path is connected with the direct current power supply VCC3.3V, one path is connected with pins 1, 2, 3, 4, 5 and 6 of a key interface J VCC3.3V respectively, a pin 7 of the key interface J VCC3.3V is grounded, a pin 48 of the main controller U VCC3.3V is connected with a pin 48 of the main controller U VCC3.3V through a capacitor C VCC3.3V, a pin 47 of the main controller U VCC3.3V, a direct current power supply pin 47, a pin 47, V VCC3.3V, a pin 47, a resistor R72 and a resistor R72 are grounded U54, a resistor R72, Diode D1, diode D2, resistor R17 are grounded, and direct current power supply VCC3.3V is connected between diode D1 and diode D2, pin 60 of main controller U1 is grounded GND through resistor R1, pin 64 of main controller U1 is connected with direct current power supply VCC3.3V all the way, one way is connected with pin 63 of main controller U1 through decoupling capacitor C9, pin 63 of main controller U1 is grounded GND, the program download debugging interface module includes JTAG interface J1 interface, pins 4, 6, 8, 10, 12, 14, 16, 18, 20 of JTAG interface J1 are grounded GND, pin 1 and main controller 2 of JTAG interface J1 are connected with direct current power supply VCC3.3V, JTAG interfaces 1, 5, 7, 13 are connected with direct current power supply VCC3.3V through resistor R1, resistor R1 is connected with direct current power supply VCC3V, pin 3, 5, 7, 9, 13, pin 56, pin 72 of JTAG interface U, pin 72, pin 1, pin 3655, pin 1, pin of JTAG interface J1, pin 72, pin 3655 and resistor R72 are connected with resistor C, pin 72, pin 1, pin 72 and pin 3655, pin 2 of JTAG interface J1 is connected to pin 4 of JTAG interface J1 through capacitor C1, the liquid crystal display module includes liquid crystal display 6, pin 1 and pin 2 of liquid crystal display 6 are connected to dc power VCC, pin 4 of liquid crystal display 6 is connected to pin 16 of main controller U1, pin 5 and pin 6 of liquid crystal display 6 are connected to pin 17 of main controller U1, pin 7 and pin 8 of liquid crystal display 6 are grounded GND, switching regulator U5 model is LM2569-5, voltage regulator U6 model is AS1117, JTAG interface J1 is a 20-pin interface, three-phase electric energy metering chip U3 model is ADE7878, main controller U1 model is LM 32F103RCT, and STM memory U4 model is FM24CL 64.

With reference to fig. 1 and 2, the detection work is performed as follows:

step 1, connecting a wiring port of the clamp-on ammeter 8 to a current signal input end 2 of the detection host.

And 2, clamping the bayonet of the clamp-on ammeter 8 at the grounding down lead of the transformer core.

And 3, opening a power switch 5 of the detection host 1 for testing, and switching between a power frequency current waveform and a harmonic current waveform by using an operation key 7.

And 4, closing the detection host 1, taking down the clamp of the clamp-on ammeter, and pulling down the current input line on the detection host 1.

In conclusion, the transformer core grounding current detector with the harmonic analysis function collects data through the clamp-on ammeter, the detection host analyzes and displays the data, the data result is visual and clear, and the technical effect of simplifying data analysis and judgment is achieved.

It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or position relationship of the structure of the present invention based on the drawings, and are only for the convenience of describing the present invention, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.

In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meaning of the above terms in the present invention can be understood in relation to the present context, according to the general idea of the present invention.

Claims (1)

1. The utility model provides a take harmonic analysis function's transformer core ground current detector, includes test host (1), pincerlike ampere meter (8), be provided with current signal input part (2) on test host (1), plug (82) electric connection of current signal input part (2) pincerlike ampere meter (8), be provided with power indicator (3), port (4) and switch (5) charge on test host (1), current signal input part (2), power indicator (3), port (4) and switch (5) all with test host (1) electric connection, its characterized in that: the testing host (1) is provided with a liquid crystal display (6) and an operation key (7), the liquid crystal display (6) and the operation key (7) are electrically connected with the testing host (1), and a lithium battery power supply circuit module, a three-phase electric energy metering module, a data processing module and a program downloading and debugging interface module are arranged in the testing host (1).

Images