Portable voltage transformer monitoring system

Abstract

The utility model discloses a portable voltage transformer monitoring system, which belongs to the field of power supply system monitoring and comprises a system power supply, a signal acquisition circuit and an upper computer, the system power supply is respectively connected with the signal acquisition circuit and the upper computer, and the signal acquisition circuit is in communication connection with the upper computer; the signal acquisition circuit comprises a main processing module, an analog-to-digital conversion module and a gigabit network module which are respectively connected with the main processing module, and a voltage acquisition module and a current acquisition module which are respectively connected with the analog-to-digital conversion module, and the gigabit network module is in communication connection with the upper computer. The portable voltage transformer monitoring system provided by the utility model can be automatically powered on and automatically started, perform data acquisition, realize an uninterrupted unattended monitoring mode, and transmit the acquired data to the upper computer for storage and analysis, thereby improving the continuity and integrity of the data, facilitating the rapid acquisition of voltage monitoring data by an operator, and improving the working efficiency of the operator. The maintenance efficiency of the power supply is improved.

Description

Technical Field

[0001] The utility model belongs to the field of power supply system monitoring, and in particular relates to a portable voltage transformer monitoring system. Background Art

[0002] The electromagnetic voltage transformer is one of the most important equipment in the traction substation. The voltage transformer converts the high voltage of the primary system into a 100V low voltage on the secondary side for metering, monitoring and relay protection. In recent years, the voltage abnormality of the voltage transformer in the traction substation has occurred from time to time, and even burnout has occurred, seriously affecting the safe operation of the railway. The main reasons for the abnormality of the voltage transformer include insulation aging caused by the natural environment and insulation damage caused by overvoltage, especially the transformer ferromagnetic resonance overvoltage and core saturation leading to substation failures. When the transformer has ferromagnetic resonance overvoltage, the voltage transformer core will be saturated, the excitation inductance will decrease, resulting in a large current on the primary side, and the internal temperature of the voltage transformer will rise sharply, eventually causing the voltage transformer to explode. At the same time, current research mainly uses the method of multiplying the secondary side signal by the transformation ratio to determine the overvoltage amplitude. However, due to the nonlinear effect of the transfer function of the voltage transformer at high frequency, the primary side voltage data obtained by this method is not accurate. Therefore, it is necessary to carry out a systematic study on the wide-band model of the EMU voltage transformer to obtain the accurate overvoltage situation of the voltage transformer during operation.

[0003] In summary, conducting research on the comprehensive online monitoring system of the voltage transformer in the traction substation, obtaining the real overvoltage data of the primary side of the voltage transformer in real time, and realizing real-time monitoring and suppression of the ferromagnetic resonance of the voltage transformer are of great significance to improving the safety and reliability of the power supply system. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a portable voltage transformer monitoring system, which solves the problem that voltage monitoring requires a lot of manpower and time.

[0005] In order to achieve the above-mentioned utility model object, the technical solution adopted by the utility model is: a portable voltage transformer monitoring system, including: a system power supply, a signal acquisition circuit and a host computer, the system power supply is connected to the signal acquisition circuit and the host computer respectively, and the signal acquisition circuit is connected to the host computer for communication;

[0006] The signal acquisition circuit includes: a main processing module, an analog-to-digital conversion module and a gigabit network module respectively connected to the main processing module, and a voltage acquisition module and a current acquisition module respectively connected to the analog-to-digital conversion module. The gigabit network module is communicatively connected to a host computer.

[0007] The beneficial effects of the utility model are as follows: the portable voltage transformer monitoring system provided by the utility model can automatically power on and start, without human intervention, and automatically collect data to achieve an uninterrupted unattended monitoring mode; the utility model is connected to the communication with the host computer through a gigabit network, and can transmit the collected data to the host computer for storage and analysis, thereby improving the continuity and integrity of the data, and at the same time, facilitating operators to quickly obtain voltage monitoring data to improve the maintenance efficiency of the power supply.

[0008] Further: the voltage acquisition module includes: an amplifier U1 and an amplifier U2;

[0009] The 7th pin of the amplifier U1 is connected to the AIN_V port, the 6th pin of the amplifier U1 is respectively connected to one end of the grounding resistor R1 and the 7th pin of the amplifier U1, the 5th pin of the amplifier U1 is respectively connected to one end of the resistor R11 and one end of the grounding resistor R12, the other end of the resistor R11 is respectively connected to the 1st pin and the 2nd pin of the amplifier U2, the 4th pin of the amplifier U2 is respectively connected to the -5V power supply, the grounding capacitor C12 and the grounding capacitor C13, the 8th pin of the amplifier U2 is respectively connected to the +5V power supply, the grounding capacitor C10 and the grounding capacitor C11, the 3rd pin of the amplifier U2 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the grounding capacitor C11, and the 4th pin of the amplifier U2 is respectively connected to the -5V power supply, the grounding capacitor C12 and the grounding capacitor C13. It is respectively connected to one end of resistor R7, one end of resistor R4, one end of capacitor C4, one end of grounding resistor R9, one end of grounding capacitor C5, one end of grounding capacitor C6, one end of grounding capacitor C7, one end of grounding capacitor C8 and one end of grounding capacitor C9. The other end of resistor R7 is connected to one end of resistor R8. The other end of resistor R8 is connected to the EX_AIN_VN port and grounded. The other end of resistor R4 is sequentially connected to one end of resistor R3, resistor R2 and resistor R1. The other end of resistor R1 is respectively connected to the EX_AIN_VP port and one end of resistor R5. The other end of capacitor C4 is sequentially connected to capacitor C3, capacitor C2, capacitor C1, resistor R6 and the other end of resistor R5.

[0010] Further: the current acquisition module includes: an amplifier U3;

[0011] The first pin of the amplifier U3 is respectively connected to the AIN_I port and one end of the resistor R19, the other end of the resistor R19 is respectively connected to the second pin of the amplifier U3 and one end of the resistor R18, the other end of the resistor R18 is respectively connected to the EX_AIN_IN port and one end of the resistor R15, the other end of the resistor R15 is respectively connected to one end of the resistor R14, the other end of the resistor R14 is respectively connected to the EX_AIN_IP port and one end of the resistor R16, the other end of the resistor R16 is respectively connected to one end of the grounding resistor R17 and the third pin of the amplifier U3, the fourth pin of the amplifier U3 is respectively connected to the -5V power supply, the grounding capacitor C16 and the grounding capacitor C17, and the eighth pin of the amplifier U3 is connected to the +5V power supply, the grounding capacitor C14 and the grounding capacitor C15.

[0012] Further: the analog-to-digital conversion module includes: an analog-to-digital conversion chip U4;

[0013] The first pin of the analog-to-digital conversion chip U4 is connected to one end of the capacitor C24, the other end of the capacitor C24 is connected to the ADC_CLK_P port, the second pin of the analog-to-digital conversion chip U4 is connected to the ADC_CLK_N port, the 10th pin, the 19th pin, the 28th pin and the 37th pin of the analog-to-digital conversion chip U4 are all connected to one end of the grounding capacitor C26, one end of the grounding capacitor C27, one end of the grounding capacitor C28, one end of the grounding capacitor C29, one end of the grounding capacitor C30 and a +1.8V power supply, the 49th pin, the 50th pin, the 53rd pin, the 54th pin, the 59th pin, the 60th pin, the 63rd pin and the 67th pin of the analog-to-digital conversion chip U4 are connected to the +1.8V power supply. 4 pins are connected to one end of grounding capacitor C34, one end of grounding capacitor C35, one end of grounding capacitor C36, one end of grounding capacitor C37, one end of grounding capacitor C38, one end of grounding capacitor C39, one end of grounding capacitor C40, one end of grounding capacitor C41, one end of grounding capacitor C42, one end of grounding capacitor C43 and a +1.8V power supply, the 51st and 52nd pins of the analog-to-digital conversion chip U4 are connected to one end of the first differential amplifier, and the other end of the first differential amplifier is connected to the voltage acquisition module, the 61st and 62nd pins of the analog-to-digital conversion chip U4 are connected to one end of the second differential amplifier, and the other end of the second differential amplifier is connected to the current acquisition module.

[0014] Further: the gigabit network module includes: a gigabit network chip U5 and a network port transformer U6;

[0015] The 1st, 3rd and 4th pins of the gigabit network chip U5 are all connected to a +1.8V voltage, the 2nd pin of the gigabit network chip U5 is connected to a PHY_LED port, the 5th, 13th, 40th and 47th pins of the gigabit network chip U5 are all connected to one end of a magnetic bead FB2, one end of a grounding capacitor C58, one end of a grounding capacitor C59, one end of a grounding capacitor C60, one end of a grounding capacitor C61 and one end of a grounding capacitor C62, the other end of the magnetic bead FB2 is grounded, and the 6th pin of the gigabit network chip U5 is connected to a grounding capacitor C61. The pin is connected to the PHY_LED0 port, the 7th pin, the 12th pin, and the 46th pin of the gigabit network chip U5 are all connected to one end of the magnetic bead FB3, one end of the grounding capacitor C73, and one end of the grounding capacitor C74, the other end of the magnetic bead FB3 is connected to the +1.8V power supply, the 14th pin, the 15th pin, the 16th pin, the 21st pin, the 22nd pin, the 27th pin, the 28th pin, the 29th pin, the 34th pin, and the 37th pin of the gigabit network chip U5 are all connected to one end of the magnetic bead FB4, one end of the grounding capacitor C63, and one end of the grounding capacitor C74. One end of capacitor C64, one end of grounded capacitor C65, one end of grounded capacitor C66, one end of grounded capacitor C67, one end of grounded capacitor C68, one end of grounded capacitor C69 and one end of grounded capacitor C70 are connected, the other end of magnetic bead FB4 is connected to a +1.8V power supply, the 38th pin of the gigabit network chip U5 is respectively connected to one end of capacitor C76 and the 3rd pin of crystal oscillator X1, the 39th pin of the gigabit network chip U5 is respectively connected to one end of capacitor C75 and the 1st pin of crystal oscillator X1, the other end of capacitor C75 is connected to the The other end is connected and grounded, the 52nd and 56th pins of the gigabit network chip U5 are connected to one end of the magnetic bead FB5, one end of the grounding capacitor C71 and one end of the grounding capacitor C72, the other end of the magnetic bead FB5 is connected to the +1.8V power supply, the 57th pin of the gigabit network chip U5 is connected to one end of the resistor R68, and the other end of the resistor R68 is respectively connected to the -1.8V power supply and one end of the grounding resistor R35, the 64th pin of the gigabit network chip U5 is connected to the +1.8V power supply, and the 65th pin of the gigabit network chip U5 is grounded;

[0016] The 19th pin of the gigabit network chip U5 is connected to the 12th pin of the network port transformer U6, the 20th pin of the gigabit network chip U5 is connected to the 11th pin of the network port transformer U6, the 23rd pin of the gigabit network chip U5 is connected to the 9th pin of the network port transformer U6, the 24th pin of the gigabit network chip U5 is connected to the 8th pin of the network port transformer U6, the 25th pin of the gigabit network chip U5 is connected to the 6th pin of the network port transformer U6, the 26th pin of the gigabit network chip U5 is connected to the 5th pin of the network port transformer U6, the 30th pin of the gigabit network chip U5 is connected to the 3rd pin of the network port transformer U6, the 31st pin of the gigabit network chip U5 is connected to the 2nd pin of the network port transformer U6, and the 1st pin of the network port transformer U6 is respectively connected to one end of the grounding capacitor C54, the 4th pin of the transformer U6, and the 1st pin of the transformer U6 The 7th pin of the transformer U6, the 10th pin of the transformer U6 and one end of the magnetic bead FB1 are connected, the other end of the magnetic bead FB1 is connected to the +1.8V power supply, the 4th pin of the network port transformer U6 is connected to one end of the grounding capacitor C55, the 7th pin of the network port transformer U6 is connected to one end of the grounding capacitor C56, the 10th pin of the network port transformer U6 is connected to one end of the grounding capacitor C57, the 15th pin of the gigabit network chip U5 is connected to one end of the resistor R66, the 18th pin of the gigabit network chip U5 is connected to one end of the resistor R65, the 21st pin of the gigabit network chip U5 is connected to one end of the resistor R64, the 24th pin of the gigabit network chip U5 is connected to one end of the resistor R63, the other end of the resistor R66 is respectively connected to one end of the capacitor C53, the other end of the resistor R65, the other end of the resistor R64 and the other end of the resistor R63, and the other end of the capacitor C53 is grounded. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a portable voltage transformer monitoring system of the utility model;

[0018] Figure 2 This is the principle diagram of the voltage acquisition module of the utility model;

[0019] Figure 3 This is the principle diagram of the current acquisition module of the utility model;

[0020] Figure 4 This is the schematic diagram of the analog-to-digital conversion module of the utility model;

[0021] Figure 5 This is a schematic diagram of the gigabit network module of the present utility model. DETAILED DESCRIPTION

[0022] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0023] like Figure 1 As shown, a portable voltage transformer monitoring system includes: a system power supply, a signal acquisition circuit and a host computer, the system power supply is connected to the signal acquisition circuit and the host computer respectively, and the signal acquisition circuit is connected to the host computer for communication;

[0024] The signal acquisition circuit includes: a main processing module, an analog-to-digital conversion module and a gigabit network module respectively connected to the main processing module, and a voltage acquisition module and a current acquisition module respectively connected to the analog-to-digital conversion module. The gigabit network module is connected to the host computer for communication.

[0025] In one embodiment of the utility model, the host computer selects an industrial tablet computer that supports Windows, which can run Sunflower remote communication software to achieve remote communication capabilities. It also has 1TB of storage space and can achieve unattended long-term monitoring. The system power supply takes a DC110V voltage externally and then converts it into two DC voltage outputs, one for powering the signal acquisition circuit, with a voltage of DC24V and a current of 1A; the other for powering the host computer, with a voltage of DC24V and a current of 6.5A.

[0026] In one embodiment of the utility model, the specific models of amplifier U1, amplifier U2 and amplifier U3 are all LMH6612MA_NOPB, the specific model of analog-to-digital conversion chip U4 is AD9251BCPZ-40, the specific model of gigabit network chip U5 is 88E1116RA0-NNC1C000, the specific model of network port transformer U6 is HR682430E, the specific models of magnetic beads FB1, FB2, FB3 and FB5 are all BLM15PD121SN1D, the specific model of magnetic bead FB4 is BLM21PG220SN1D, and the chip of the main processing module is XC7Z045.

[0027] like Figure 2 As shown, it is a schematic diagram of a voltage acquisition module, and the voltage acquisition module includes: an amplifier U1 and an amplifier U2;

[0028] The 7th pin of the amplifier U1 is connected to the AIN_V port, the 6th pin of the amplifier U1 is connected to one end of the grounding resistor R1 and the 7th pin of the amplifier U1 respectively, the 5th pin of the amplifier U1 is connected to one end of the resistor R11 and one end of the grounding resistor R12 respectively, the other end of the resistor R11 is connected to the 1st pin and the 2nd pin of the amplifier U2 respectively, the 4th pin of the amplifier U2 is connected to the -5V power supply, the grounding capacitor C12 and the grounding capacitor C13 respectively, the 8th pin of the amplifier U2 is connected to the +5V power supply, the grounding capacitor C10 and the grounding capacitor C11, the 3rd pin of the amplifier U2 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the resistor R7 respectively. One end of the grounding resistor R9, one end of the grounding capacitor C5, one end of the grounding capacitor C6, one end of the grounding capacitor C7, one end of the grounding capacitor C8 and one end of the grounding capacitor C9 are connected, the other end of the resistor R7 is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the EX_AIN_VN port and grounded, the other end of the resistor R4 is connected to one end of the resistor R3, the resistor R2 and the resistor R1 in sequence, the other end of the resistor R1 is respectively connected to the EX_AIN_VP port and one end of the resistor R5, the other end of the capacitor C4 is connected to the capacitor C3, the capacitor C2, the capacitor C1, the resistor R6 and the other end of the resistor R5 in sequence.

[0029] like Figure 3 As shown, it is a schematic diagram of a current acquisition module, and the current acquisition module includes: an amplifier U3;

[0030] The first pin of the amplifier U3 is respectively connected to the AIN_I port and one end of the resistor R19, the other end of the resistor R19 is respectively connected to the second pin of the amplifier U3 and one end of the resistor R18, the other end of the resistor R18 is respectively connected to the EX_AIN_IN port and one end of the resistor R15, the other end of the resistor R15 is respectively connected to one end of the resistor R14, the other end of the resistor R14 is respectively connected to the EX_AIN_IP port and one end of the resistor R16, the other end of the resistor R16 is respectively connected to one end of the grounding resistor R17 and the third pin of the amplifier U3, the fourth pin of the amplifier U3 is respectively connected to the -5V power supply, the grounding capacitor C16 and the grounding capacitor C17, and the eighth pin of the amplifier U3 is connected to the +5V power supply, the grounding capacitor C14 and the grounding capacitor C15.

[0031] like Figure 4 As shown, it is a schematic diagram of the analog-to-digital conversion module, and the analog-to-digital conversion module includes: an analog-to-digital conversion chip U4;

[0032] The first pin of the analog-to-digital conversion chip U4 is connected to one end of the capacitor C24, the other end of the capacitor C24 is connected to the ADC_CLK_P port, the second pin of the analog-to-digital conversion chip U4 is connected to the ADC_CLK_N port, the 10th pin, the 19th pin, the 28th pin and the 37th pin of the analog-to-digital conversion chip U4 are all connected to one end of the grounded capacitor C26, one end of the grounded capacitor C27, one end of the grounded capacitor C28, one end of the grounded capacitor C29, one end of the grounded capacitor C30 and the +1.8V power supply, the 49th pin, the 50th pin, the 53rd pin, the 54th pin, the 59th pin, the 60th pin, the 63rd pin and the 64th pin of the analog-to-digital conversion chip U4 are connected to the +1.8V power supply. The pins are connected to one end of grounding capacitor C34, one end of grounding capacitor C35, one end of grounding capacitor C36, one end of grounding capacitor C37, one end of grounding capacitor C38, one end of grounding capacitor C39, one end of grounding capacitor C40, one end of grounding capacitor C41, one end of grounding capacitor C42, one end of grounding capacitor C43 and a +1.8V power supply, the 51st and 52nd pins of the analog-to-digital conversion chip U4 are connected to one end of the first differential amplifier, and the other end of the first differential amplifier is connected to the voltage acquisition module, the 61st and 62nd pins of the analog-to-digital conversion chip U4 are connected to one end of the second differential amplifier, and the other end of the second differential amplifier is connected to the current acquisition module.

[0033] Table 1 below shows the pin connection relationship between the first differential amplifier and the second differential amplifier and other modules;

[0034] Table 1

[0035]

[0036] Table 2 below shows the pin connection relationship between the main processor chip and other modules;

[0037] Table 2

[0038]

[0039]

[0040]

[0041] like Figure 5 As shown, it is a schematic diagram of a gigabit network module, which includes: a gigabit network chip U5 and a network port transformer U6;

[0042] The 1st, 3rd and 4th pins of the gigabit network chip U5 are all connected to the +1.8V voltage, the 2nd pin of the gigabit network chip U5 is connected to the PHY_LED port, the 5th, 13th, 40th and 47th pins of the gigabit network chip U5 are all connected to one end of the magnetic bead FB2, one end of the grounding capacitor C58, one end of the grounding capacitor C59, one end of the grounding capacitor C60, one end of the grounding capacitor C61 and one end of the grounding capacitor C62, the other end of the magnetic bead FB2 is grounded, and the 6th pin of the gigabit network chip U5 is connected to the ground. Connected to the PHY_LED0 port, the 7th, 12th and 46th pins of the gigabit network chip U5 are connected to one end of the ferrite bead FB3, one end of the grounding capacitor C73 and one end of the grounding capacitor C74, the other end of the ferrite bead FB3 is connected to the +1.8V power supply, the 14th, 15th, 16th, 21st, 22nd, 27th, 28th, 29th, 34th and 37th pins of the gigabit network chip U5 are connected to one end of the ferrite bead FB4, one end of the grounding capacitor C63, and one end of the grounding capacitor C74. One end of capacitor C64, one end of grounded capacitor C65, one end of grounded capacitor C66, one end of grounded capacitor C67, one end of grounded capacitor C68, one end of grounded capacitor C69 and one end of grounded capacitor C70 are connected, the other end of magnetic bead FB4 is connected to a +1.8V power supply, the 38th pin of gigabit network chip U5 is respectively connected to one end of capacitor C76 and the 3rd pin of crystal oscillator X1, the 39th pin of gigabit network chip U5 is respectively connected to one end of capacitor C75 and the 1st pin of crystal oscillator X1, the other end of capacitor C75 is connected to capacitor C7 6 and grounded, the 52nd and 56th pins of the gigabit network chip U5 are connected to one end of the magnetic bead FB5, one end of the grounding capacitor C71 and one end of the grounding capacitor C72, the other end of the magnetic bead FB5 is connected to the +1.8V power supply, the 57th pin of the gigabit network chip U5 is connected to one end of the resistor R68, the other end of the resistor R68 is respectively connected to the -1.8V power supply and one end of the grounding resistor R35, the 64th pin of the gigabit network chip U5 is connected to the +1.8V power supply, and the 65th pin of the gigabit network chip U5 is grounded;

[0043] The 19th pin of the gigabit network chip U5 is connected to the 12th pin of the network port transformer U6, the 20th pin of the gigabit network chip U5 is connected to the 11th pin of the network port transformer U6, the 23rd pin of the gigabit network chip U5 is connected to the 9th pin of the network port transformer U6, the 24th pin of the gigabit network chip U5 is connected to the 8th pin of the network port transformer U6, the 25th pin of the gigabit network chip U5 is connected to the 6th pin of the network port transformer U6, the 26th pin of the gigabit network chip U5 is connected to the 5th pin of the network port transformer U6, the 30th pin of the gigabit network chip U5 is connected to the 3rd pin of the network port transformer U6, the 31st pin of the gigabit network chip U5 is connected to the 2nd pin of the network port transformer U6, and the 1st pin of the network port transformer U6 is respectively connected to one end of the grounding capacitor C54, the 4th pin of the transformer U6, the 7th pin of the transformer U6, and the The 10th pin of the voltage transformer U6 is connected to one end of the magnetic bead FB1, the other end of the magnetic bead FB1 is connected to the +1.8V power supply, the 4th pin of the network port transformer U6 is connected to one end of the grounding capacitor C55, the 7th pin of the network port transformer U6 is connected to one end of the grounding capacitor C56, the 10th pin of the network port transformer U6 is connected to one end of the grounding capacitor C57, the 15th pin of the gigabit network chip U5 is connected to one end of the resistor R66, the 18th pin of the gigabit network chip U5 is connected to one end of the resistor R65, the 21st pin of the gigabit network chip U5 is connected to one end of the resistor R64, the 24th pin of the gigabit network chip U5 is connected to one end of the resistor R63, the other end of the resistor R66 is respectively connected to one end of the capacitor C53, the other end of the resistor R65, the other end of the resistor R64 and the other end of the resistor R63, and the other end of the capacitor C53 is grounded.

[0044] Combine the following Figure 2 , Figure 3 , Figure 4 as well as Figure 5 The working process of the utility model is described as follows:

[0045] The utility model provides a portable voltage transformer monitoring system, which collects voltage through the AIN_V port of the voltage collection module and collects current through the AIN_I port of the current collection module;

[0046] The voltage acquisition module is composed of a 1000:1 RC step-down circuit and a bipolar rail-to-rail voltage follower circuit. It can directly acquire voltage and transmit the acquired information to the analog-to-digital conversion chip through the 51st and 52nd pins of the analog-to-digital conversion chip to process the current signal to obtain voltage data; the current acquisition module first converts the current signal into a voltage signal through a sampling resistor, then amplifies the voltage signal by 3.9 times, and transmits the voltage signal to the analog-to-digital conversion chip through the 61st and 62nd pins of the analog-to-digital conversion chip to process the voltage signal to obtain current data; the analog-to-digital conversion module transmits the processed voltage data and current data to the main processing module;

[0047] The collected voltage and current data are analyzed for power quality parameters in the main processing module, and overvoltage fault judgment is performed at the same time. The power quality parameter analysis extracts data at a rate of 12.8K / s for parameter calculation, and the calculation results are packaged and uploaded through the gigabit network module. If the overvoltage fault judgment is judged as non-overvoltage, the voltage and current data are extracted at a rate of 100K / s and packaged and uploaded through the gigabit network module. If it is judged as overvoltage, the voltage and current data are packaged and uploaded through the gigabit network module at a sampling rate of 10Msps.

[0048] The beneficial effects of the utility model are as follows: the portable voltage transformer monitoring system provided by the utility model can automatically power on and start, without human intervention, and automatically collect data to achieve an uninterrupted unattended monitoring mode; the utility model is connected to the communication with the host computer through a gigabit network, and can transmit the collected data to the host computer for storage and analysis, thereby improving the continuity and integrity of the data, and at the same time, facilitating operators to quickly obtain voltage monitoring data to improve the maintenance efficiency of the power supply.

Claims

1. A portable voltage transformer monitoring system, characterized in that: include: A system power supply, a signal acquisition circuit and a host computer, wherein the system power supply is connected to the signal acquisition circuit and the host computer respectively, and the signal acquisition circuit is communicatively connected to the host computer; The signal acquisition circuit includes: a main processing module, an analog-to-digital conversion module and a gigabit network module respectively connected to the main processing module, and a voltage acquisition module and a current acquisition module respectively connected to the analog-to-digital conversion module. The gigabit network module is communicatively connected to a host computer.

2. The portable voltage transformer monitoring system according to claim 1, characterized in that: The voltage acquisition module includes: an amplifier U1 and an amplifier U2; The 7th pin of the amplifier U1 is connected to the AIN_V port, the 6th pin of the amplifier U1 is respectively connected to one end of the grounding resistor R1 and the 7th pin of the amplifier U1, the 5th pin of the amplifier U1 is respectively connected to one end of the resistor R11 and one end of the grounding resistor R12, the other end of the resistor R11 is respectively connected to the 1st pin and the 2nd pin of the amplifier U2, the 4th pin of the amplifier U2 is respectively connected to the -5V power supply, the grounding capacitor C12 and the grounding capacitor C13, the 8th pin of the amplifier U2 is respectively connected to the +5V power supply, the grounding capacitor C10 and the grounding capacitor C11, the 3rd pin of the amplifier U2 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the grounding capacitor C11, and the 4th pin of the amplifier U2 is respectively connected to the -5V power supply, the grounding capacitor C12 and the grounding capacitor C13. It is respectively connected to one end of resistor R7, one end of resistor R4, one end of capacitor C4, one end of grounding resistor R9, one end of grounding capacitor C5, one end of grounding capacitor C6, one end of grounding capacitor C7, one end of grounding capacitor C8 and one end of grounding capacitor C9. The other end of resistor R7 is connected to one end of resistor R8. The other end of resistor R8 is connected to the EX_AIN_VN port and grounded. The other end of resistor R4 is sequentially connected to one end of resistor R3, resistor R2 and resistor R1. The other end of resistor R1 is respectively connected to the EX_AIN_VP port and one end of resistor R5. The other end of capacitor C4 is sequentially connected to capacitor C3, capacitor C2, capacitor C1, resistor R6 and the other end of resistor R5.

3. The portable voltage transformer monitoring system according to claim 1, characterized in that: The current acquisition module includes: an amplifier U3; The first pin of the amplifier U3 is respectively connected to the AIN_I port and one end of the resistor R19, the other end of the resistor R19 is respectively connected to the second pin of the amplifier U3 and one end of the resistor R18, the other end of the resistor R18 is respectively connected to the EX_AIN_IN port and one end of the resistor R15, the other end of the resistor R15 is respectively connected to one end of the resistor R14, the other end of the resistor R14 is respectively connected to the EX_AIN_IP port and one end of the resistor R16, the other end of the resistor R16 is respectively connected to one end of the grounding resistor R17 and the third pin of the amplifier U3, the fourth pin of the amplifier U3 is respectively connected to the -5V power supply, the grounding capacitor C16 and the grounding capacitor C17, and the eighth pin of the amplifier U3 is connected to the +5V power supply, the grounding capacitor C14 and the grounding capacitor C15.

4. The portable voltage transformer monitoring system according to claim 1, characterized in that: The analog-to-digital conversion module includes: an analog-to-digital conversion chip U4; The first pin of the analog-to-digital conversion chip U4 is connected to one end of the capacitor C24, the other end of the capacitor C24 is connected to the ADC_CLK_P port, the second pin of the analog-to-digital conversion chip U4 is connected to the ADC_CLK_N port, the 10th pin, the 19th pin, the 28th pin and the 37th pin of the analog-to-digital conversion chip U4 are all connected to one end of the grounding capacitor C26, one end of the grounding capacitor C27, one end of the grounding capacitor C28, one end of the grounding capacitor C29, one end of the grounding capacitor C30 and a +1.8V power supply, the 49th pin, the 50th pin, the 53rd pin, the 54th pin, the 59th pin, the 60th pin, the 63rd pin and the 67th pin of the analog-to-digital conversion chip U4 are connected to the +1.8V power supply. 4 pins are connected to one end of grounding capacitor C34, one end of grounding capacitor C35, one end of grounding capacitor C36, one end of grounding capacitor C37, one end of grounding capacitor C38, one end of grounding capacitor C39, one end of grounding capacitor C40, one end of grounding capacitor C41, one end of grounding capacitor C42, one end of grounding capacitor C43 and a +1.8V power supply, the 51st and 52nd pins of the analog-to-digital conversion chip U4 are connected to one end of the first differential amplifier, and the other end of the first differential amplifier is connected to the voltage acquisition module, the 61st and 62nd pins of the analog-to-digital conversion chip U4 are connected to one end of the second differential amplifier, and the other end of the second differential amplifier is connected to the current acquisition module.

5. The portable voltage transformer monitoring system according to claim 1, characterized in that: The Gigabit network module includes: a Gigabit network chip U5 and a network port transformer U6; The 1st, 3rd and 4th pins of the gigabit network chip U5 are all connected to a +1.8V voltage, the 2nd pin of the gigabit network chip U5 is connected to a PHY_LED port, the 5th, 13th, 40th and 47th pins of the gigabit network chip U5 are all connected to one end of a magnetic bead FB2, one end of a grounding capacitor C58, one end of a grounding capacitor C59, one end of a grounding capacitor C60, one end of a grounding capacitor C61 and one end of a grounding capacitor C62, the other end of the magnetic bead FB2 is grounded, and the 6th pin of the gigabit network chip U5 is connected to a grounding capacitor C61. The pin is connected to the PHY_LED0 port, the 7th pin, the 12th pin, and the 46th pin of the gigabit network chip U5 are all connected to one end of the magnetic bead FB3, one end of the grounding capacitor C73, and one end of the grounding capacitor C74, the other end of the magnetic bead FB3 is connected to the +1.8V power supply, the 14th pin, the 15th pin, the 16th pin, the 21st pin, the 22nd pin, the 27th pin, the 28th pin, the 29th pin, the 34th pin, and the 37th pin of the gigabit network chip U5 are all connected to one end of the magnetic bead FB4, one end of the grounding capacitor C63, and one end of the grounding capacitor C74. One end of capacitor C64, one end of grounded capacitor C65, one end of grounded capacitor C66, one end of grounded capacitor C67, one end of grounded capacitor C68, one end of grounded capacitor C69 and one end of grounded capacitor C70 are connected, the other end of magnetic bead FB4 is connected to a +1.8V power supply, the 38th pin of the gigabit network chip U5 is respectively connected to one end of capacitor C76 and the 3rd pin of crystal oscillator X1, the 39th pin of the gigabit network chip U5 is respectively connected to one end of capacitor C75 and the 1st pin of crystal oscillator X1, the other end of capacitor C75 is connected to the The other end is connected and grounded, the 52nd and 56th pins of the gigabit network chip U5 are connected to one end of the magnetic bead FB5, one end of the grounding capacitor C71 and one end of the grounding capacitor C72, the other end of the magnetic bead FB5 is connected to the +1.8V power supply, the 57th pin of the gigabit network chip U5 is connected to one end of the resistor R68, and the other end of the resistor R68 is respectively connected to the -1.8V power supply and one end of the grounding resistor R35, the 64th pin of the gigabit network chip U5 is connected to the +1.8V power supply, and the 65th pin of the gigabit network chip U5 is grounded; The 19th pin of the gigabit network chip U5 is connected to the 12th pin of the network port transformer U6, the 20th pin of the gigabit network chip U5 is connected to the 11th pin of the network port transformer U6, the 23rd pin of the gigabit network chip U5 is connected to the 9th pin of the network port transformer U6, the 24th pin of the gigabit network chip U5 is connected to the 8th pin of the network port transformer U6, the 25th pin of the gigabit network chip U5 is connected to the 6th pin of the network port transformer U6, the 26th pin of the gigabit network chip U5 is connected to the 5th pin of the network port transformer U6, the 30th pin of the gigabit network chip U5 is connected to the 3rd pin of the network port transformer U6, the 31st pin of the gigabit network chip U5 is connected to the 2nd pin of the network port transformer U6, and the 1st pin of the network port transformer U6 is respectively connected to one end of the grounding capacitor C54, the 4th pin of the transformer U6, and the 1st pin of the transformer U6 The 7th pin of the transformer U6, the 10th pin of the transformer U6 and one end of the magnetic bead FB1 are connected, the other end of the magnetic bead FB1 is connected to the +1.8V power supply, the 4th pin of the network port transformer U6 is connected to one end of the grounding capacitor C55, the 7th pin of the network port transformer U6 is connected to one end of the grounding capacitor C56, the 10th pin of the network port transformer U6 is connected to one end of the grounding capacitor C57, the 15th pin of the gigabit network chip U5 is connected to one end of the resistor R66, the 18th pin of the gigabit network chip U5 is connected to one end of the resistor R65, the 21st pin of the gigabit network chip U5 is connected to one end of the resistor R64, the 24th pin of the gigabit network chip U5 is connected to one end of the resistor R63, the other end of the resistor R66 is respectively connected to one end of the capacitor C53, the other end of the resistor R65, the other end of the resistor R64 and the other end of the resistor R63, and the other end of the capacitor C53 is grounded.

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