CN110824258A - Capacitance test analytical equipment - Google Patents
Capacitance test analytical equipment Download PDFInfo
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- CN110824258A CN110824258A CN201911236023.1A CN201911236023A CN110824258A CN 110824258 A CN110824258 A CN 110824258A CN 201911236023 A CN201911236023 A CN 201911236023A CN 110824258 A CN110824258 A CN 110824258A
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- 238000012360 testing method Methods 0.000 title claims abstract description 104
- 230000001360 synchronised effect Effects 0.000 claims abstract description 53
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 238000004891 communication Methods 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 24
- 238000012545 processing Methods 0.000 claims description 20
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- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000007405 data analysis Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 7
- 238000013500 data storage Methods 0.000 claims description 5
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 210000000080 chela (arthropods) Anatomy 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
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- 238000005516 engineering process Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
- G01R31/013—Testing passive components
- G01R31/016—Testing of capacitors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0676—Mutual
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/002—Mutual synchronization
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a capacitance test analysis device, which comprises an electricity testing discharge rod, a test host and a plurality of high-altitude current clamp devices, wherein the electricity testing discharge rod is used for discharging the electric quantity of a capacitor and testing the residual electric quantity of the capacitor; the high-altitude current clamp device is provided with a wireless synchronous digital current clamp which is in communication connection with the test host. The invention can simultaneously detect a plurality of capacitor banks and send data in real time through the wireless synchronous digital current clamp, thereby saving manpower and material resources, being convenient to operate and obviously improving the efficiency.
Description
Technical Field
The invention relates to the field of capacitance test analysis, in particular to capacitance test analysis equipment.
Background
The capacitance value test of the parallel capacitor bank is one of important test items of a capacitor preventive test, according to the regulations, the 10kV parallel capacitor bank needs to be subjected to the capacitance value test once every 6 years, and the capacitance value test is also carried out if the parallel capacitor bank is abnormal in operation. Only one test channel of a capacitance tester in the current market is provided, and sensor data is in a wired transmission mode, so that a tester needs to enter and exit a capacitor bank frame for multiple times and climb the capacitor bank frame with a wired sensor (current transformer) in a narrow capacitor bank frame space during testing to test capacitors one by one; because the testing channel of the tester is only one, and the capacitor bank is formed by connecting dozens of even hundreds of small capacitors in parallel, in the measuring operation process, measuring personnel need to frequently switch to the tested capacitor, so that the time is consumed very much, and the efficiency is not high; because capacitor bank mounted position is higher, need carry out the aerial work and install the measurement current pincers, the test procedure of accomplishing a capacitor bank is more time-consuming, hard, work efficiency is low, and the later stage still needs the manual calculation offset value simultaneously, makes mistakes easily.
Disclosure of Invention
The invention provides a capacitance test analysis device for overcoming the problems that in the prior art, because only one test channel of a tester is provided, and a capacitor bank is formed by connecting dozens of small capacitors or even hundreds of small capacitors in parallel, in the process of measurement operation, a measurer needs to frequently switch to a capacitor to be tested, the time is consumed very much, and the efficiency is low. The invention can simultaneously detect a plurality of capacitor banks and send data in real time through the wireless synchronous digital current clamp, thereby saving manpower and material resources, being convenient to operate and obviously improving the efficiency.
In order to solve the technical problems, the invention adopts the technical scheme that: a capacitance test analysis device comprises an electricity testing discharge rod, a test host and a plurality of high-altitude current clamp devices, wherein the electricity testing discharge rod is used for discharging the electric quantity of each capacitor in a capacitor bank and testing the residual electric quantity of each capacitor; the high-altitude current clamp device is provided with a wireless synchronous digital current clamp, the wireless synchronous digital current clamp is in communication connection with the test host, and the test host receives and processes test data sent by the wireless synchronous digital current clamp. Like this, whole capacitor bank test process is all to put away the electric quantity in the condenser earlier, this technical scheme adopts that not only can be used for the condenser to discharge and can show the electricity of examining of condenser residual capacity stick in time, after discharging completely, through testing the host computer input test voltage in capacitor bank circuit, reuse a plurality of high altitude current clamp device to go the induced-current in the test circuit simultaneously, because the current clamp that is equipped with in the high altitude current clamp device is wireless synchronous digital current clamp, can send the signal of testing to the host computer in real time, the data that every high altitude current clamp device feedbacks are handled to the host computer, accomplish whole process, because can adopt a plurality of high altitude current clamp devices to go the test simultaneously, can double the efficiency that promotes the detection, manpower and materials resources are saved.
Furthermore, the test host comprises a voltage transformer, a data analysis storage system, a wireless receiving module and an alternating current voltage output power supply for inputting test voltage into the capacitor bank circuit, the voltage transformer is electrically connected with the data analysis storage system, the wireless receiving module is electrically connected with the data analysis storage system, and the wireless receiving module is further in communication connection with the wireless digital current clamp. Thus, the test host mainly has three functions, wherein the first function is an alternating voltage output power supply, and test voltage is input into the circuit; the second is a voltage transformer which is equivalent to one end of a transformer and is used for collecting voltage signals fed back from the circuit; and the third is a data analysis and storage system which is mainly used for processing and storing the induced current signals received by the wireless receiving module and the voltage signals acquired by the voltage transformer.
Further, test electric discharging rod including discharging and connect, connecting rod and operation end, discharge and connect and pass through the connecting rod is connected the operation end, discharge and connect the department and be equipped with the voltage sampling circuit of the data of discharging of collection and the data transmitter of the data of discharging of transmission, voltage sampling circuit with data transmitter electric connection, the operation end is equipped with data receiver, singlechip processing module and display screen, data transmitter with data receiver communication connection, singlechip processing module handles data connect the received data of ware piece and pass through the display screen shows. Like this, test the electric discharge stick and can at first all put the electric quantity in the capacitor bank to can be through the voltage signal in the real-time acquisition circuit of voltage sampling circuit and give data receiver through data transmitter transmission, and then show through the display screen, the operator can know the residual capacity in the capacitor tested in real time, avoids danger, promotes the efficiency that detects.
Furthermore, the voltage sampling circuit comprises a hall isolation change output module, an impedance conversion module, a low-pass filter module, a data processing module and a test contact module used for being in contact with a test point, wherein the output end of the test contact module is electrically connected with the input end of the hall isolation change output module, the output end of the hall isolation change output module is electrically connected with the input end of the impedance conversion module, the output end of the impedance conversion module is electrically connected with the input end of the low-pass filter module, the output end of the low-pass filter module is electrically connected with the input end of the data processing module, and the output end of the data processing module is connected with the input end of the wireless transmitting module. The working process of the electroscopic discharge rod is as follows: the discharging joint is in contact connection with the testing point of the tested capacitor group through a conductive contact, voltage flows to the Hall sensor and a precision resistor simultaneously, current flows to one end of the precision resistor, the other end of the precision resistor is grounded, the current flows to the Hall sensor simultaneously to be isolated, transformed and output, then impedance transformation is carried out through an impedance change circuit, then the sampled current signal is stabilized through a low-pass filter circuit, then data identification and storage are carried out on the single chip microcomputer, the sampled current signal is transmitted to a wireless receiving module of the operating end through a wireless transmitting module, the current data are read by the wireless receiving module through a single chip microcomputer data processing module of the operating end, and then display is carried out through a display screen, so that an operator can observe the condition of the residual voltage of the. The principle is that when the discharging contact contacts the discharging object to be discharged, the current IR flowing through the precision resistor RF is consistent with the current IH flowing through the Hall sensor, and the residual voltage U (IR RF) of the discharging object is equal to IH RF, so that the residual voltage of the discharging object can be obtained by sampling and calculating the primary stage of the Hall sensor.
Furthermore, the high-altitude current clamp device further comprises a current clamp wrench which is located on the side wall of the wireless synchronous digital current clamp and controls the wireless synchronous digital current clamp to open and close, one side of the wireless synchronous digital current clamp is connected with a hollow insulating rod, a power supply, an electric push rod and a control module for controlling the electric push rod to stretch are arranged inside the insulating rod, the push rod of the electric push rod is connected with the current clamp wrench through a PBO rope, and the power supply is electrically connected with the electric push rod through the control module. Thus, the current clamp wrench is equivalent to a control switch of a wireless synchronous digital current clamp switching control circuit, when a control module enables a motor of an electric push rod to rotate reversely, the push rod of the electric push rod retracts, the current clamp wrench is pulled down through a traction piece, and when the current clamp wrench is pulled down, the control circuit starts to work, so that an opening of the wireless synchronous digital current clamp is slowly opened; when control module makes electric putter's motor corotation, electric putter's push rod is stretched forward, loses the power of pulling to current pincers spanner, and current pincers spanner return, during current pincers spanner return, wireless synchronous digital current pincers's opening begins slowly to close, and whole process adopts control module control an electric putter's flexible, and then the pulling current pincers spanner reaches remote control wireless synchronous digital current pincers's opening and shutting. The wireless synchronous digital current clamp is directly installed at a corresponding test position on the ground, and the purposes of no high-altitude operation, no connecting cable and zero-risk safety measurement in the whole test process are achieved.
Further, control module includes electromagnetic relay group, RF receiving module and is equipped with RF transmitting module's remote controller, the power in proper order with electromagnetic relay group with electric putter's motor electric connection, electromagnetic relay group simultaneously with RF receiving module electric connection, RF transmitting module with RF receiving module communication connection. Therefore, as the general test positions are higher, if the control module adopts the form of a control switch, a very long wire needs to be led, so that the risk of high-voltage induction electric shock easily exists, or the switch is at a very high position and is not easy to operate; therefore, a remote control mode is further adopted, the remote controller RF transmitting module and the RF receiving module belong to the mature prior art, the remote controller can transmit an operation command through a button, if an 'opening' button is pressed, the RF transmitting module transmits a signal to the RF receiving module, the RF receiving module receives the signal, current is amplified through a triode, the connection mode of a switch of an electromagnetic relay is changed, the output direction of a power supply to a motor is further controlled, the motor is enabled to be reversed, a push rod of an electric push rod retracts to pull down a current clamp wrench through a traction piece, and when the current clamp wrench is pulled down, a control circuit starts to work, so that an opening of a wireless synchronous digital current clamp is slowly opened; when a 'closing' button is pressed, another signal is transmitted to an RF receiving module through an RF transmitting module, after the RF receiving module receives the signal, the current is amplified through a triode, the connection mode of a switch of an electromagnetic relay is changed again, and then the output direction of a power supply to a motor is controlled, so that the motor rotates forwards, a push rod of an electric push rod extends forwards, the pulling force to a current clamp wrench is lost, the current clamp wrench returns, and when the current clamp wrench returns, the opening of a wireless synchronous digital current clamp starts to be closed slowly; when the remote controller presses the stop button, the triode is closed, and the opening of the wireless synchronous digital current clamp can be opened at any position.
Further, the electromagnetic relay group comprises a first electromagnetic relay group and a second electromagnetic relay group, the first electromagnetic relay group comprises an electromagnetic relay U1, a diode D1, a triode Q1 and a resistor R1, the second electromagnetic relay group comprises an electromagnetic relay U2, a diode D2, a triode Q2 and a resistor R2, the power supply is a battery B1, the positive pole of the battery B1 is simultaneously and respectively connected with the 6 interface of the electromagnetic relay U1, the 6 interface of the electromagnetic relay U2, the collector electrode of the triode Q1 and the collector electrode of the triode Q2; the negative electrode of the battery B1 is simultaneously electrically connected with the 1 interface of the electromagnetic relay U1, the 4 interface of the electromagnetic relay U1, the positive electrode of the diode, the 1 interface of the battery relay U2, the 4 interface of the battery relay U2 and the positive electrode of the diode; the emitting electrode of the triode Q1 is simultaneously and respectively electrically connected with the cathode of the diode and the 2 interface of the electromagnetic relay U1, and the base electrode of the triode Q1 is sequentially and electrically connected with the resistor R1 and the RF receiving module RF 1; the 5 interface of the electromagnetic relay U1 is electrically connected with the positive electrode interface of the motor, and the 3 interface of the electromagnetic relay U1 is electrically connected with the negative electrode interface of the motor; the emitting electrode of the triode Q2 is simultaneously and respectively electrically connected with the cathode of the diode and the 2 interface of the electromagnetic relay U2, and the base electrode of the triode Q2 is sequentially and electrically connected with the resistor R2 and the RF receiving module RF 2; the 3 interface of the electromagnetic relay U2 is electrically connected with the positive electrode interface of the motor, and the 5 interface of the electromagnetic relay U2 is electrically connected with the negative electrode interface of the motor; the battery relay U2 is characterized in that a first armature switch is connected between a 6 interface and a 5 interface of the battery relay U1, a second armature switch is connected between a 4 interface and a 3 interface, a first induction coil is connected between a 2 interface and a 1 interface, a third armature switch is connected between the 6 interface and the 5 interface of the battery relay U2, a fourth armature switch is connected between the 4 interface and the 3 interface, and a second induction coil is connected between the 2 interface and the 1 interface. Thus, when the remote controller presses the 'open' button, the triode Q1 is turned off, the triode Q2 is conducted, the reverse rotation control relay coil is electrified, the normally open contact is closed, the motor is electrified, the electric push rod does retraction movement, the traction piece is tensioned, the current clamp wrench is driven, the opening of the wireless synchronous digital current clamp is opened, otherwise, when the remote controller presses the 'close' button, the triode Q1 is conducted, the triode Q2 is turned off, the forward rotation control relay coil is electrified, the normally open contact is closed, the electric forward rotation is realized, the electric push rod does extension movement, the jaw of the wireless synchronous digital current clamp is closed, when the remote controller presses the 'stop' button, the triodes Q1 and Q2 are simultaneously closed, and the opening of the wireless synchronous digital current clamp can be opened at any position.
Furthermore, the wireless synchronous digital current clamp comprises a plastic shell, two magnetic cores capable of synthesizing a closed magnetic circuit are arranged on the plastic shell, a current sampling circuit, an amplifying and filtering circuit, an ADC (analog to digital converter) circuit, a single chip microcomputer and a wireless transmitting module are arranged in the plastic shell, the current sampling circuit, the amplifying and filtering circuit, the ADC switching circuit, the single chip microcomputer and the wireless transmitting module are used for collecting and processing induced current of the closed magnetic circuit, the current clamp wrench controls the closed magnetic circuit to be opened and closed, the ADC switching circuit comprises an ADS1675, a power supply circuit and a zero-crossing detection circuit, one end of the ADS1675 is electrically connected with the output end of the amplifying and filtering circuit, the other end of the ADS1675 is connected; the output end of the current sampling circuit is connected with the input end of the amplifying and filtering circuit, the output end of the amplifying and filtering circuit is connected with the input end of the ADC conversion circuit, the output end of the ADC conversion circuit is connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is connected with the wireless transmitting module, and the wireless transmitting module is in communication connection with the wireless receiving module. The wireless synchronous digital current clamp is a key device of the invention, firstly, an electric push rod is controlled by a remote controller to pull a current clamp wrench, a magnetic core moves, an opening of the wireless synchronous digital current clamp is opened, a tested object is clamped into the opening, then the opening of the wireless synchronous digital current clamp is closed, induced current is measured through a voltage sampling circuit like a common current clamp, the measured induced current is processed through an amplifying filter circuit, an ADC conversion circuit and a single chip microcomputer, then is sent to a wireless receiving module of a test host through a wireless transmitting module, and finally current data is processed through a data analysis storage system of the test host.
Further, the wireless transmitting module is a 2.4G wireless transmitting module, and the wireless receiving module is a 2.4G wireless receiving module. Therefore, because the current and the voltage flowing through the capacitor are measured in different places, the accuracy of the measurement result is directly influenced by the synchronous accuracy of synchronous sampling of the current and the voltage, which is a key technology for realizing multi-channel wireless measurement, and the method for realizing time synchronization mainly comprises the following steps: 1. GPS or Beidou satellite is used for time service, but the price is very high, and GPS signals cannot be guaranteed in special environment. 2. The high-precision constant-temperature crystal oscillator is utilized to achieve the function of keeping time accurately, but the cost is high, the duration is short, and the operation can be kept for only a few hours. 3. And the 2.4G wireless module is utilized to realize time synchronization. Through technical comparison, a 2.4G wireless synchronization technology is adopted, time synchronization is achieved through a mutual timing method, wireless transmission and wireless synchronization are combined into one, synchronous acquisition is guaranteed, and acquired data can be transmitted out in a wireless mode.
Preferably, the number of high altitude current clamp devices is 6. Therefore, because of a common three-phase circuit, 6 test points need to be tested during a group of tests, the high-altitude current clamp device in the equipment is set to be 6, the effect of grouping tests can be achieved, and the test process is not disordered.
Compared with the prior art, the beneficial effects are:
1. can adopt a plurality of high altitude electric current pincers devices to go to test simultaneously, can promote the efficiency that detects doubly, the material resources of using manpower sparingly.
2. The wireless synchronous digital current clamp is directly installed at a corresponding test position on the ground through the high-altitude current clamp device, and the purposes of high-altitude operation, no connecting cable and zero-risk safety measurement are not needed in the whole test process.
3. Adopt wireless synchronous digital current pincers and test host computer communication connection cooperation, reach the real-time transmission of data through 2.4G wireless transmitting module and 2.4G wireless receiving module, practice thrift the cost, data transmission is more stable.
Drawings
FIG. 1 is a schematic diagram of the circuit structure of the present invention under test.
Fig. 2 is a schematic circuit diagram of an ac voltage output power supply in the test mainframe according to the present invention.
FIG. 3 is a schematic view of the structure of the discharge electroscope of the present invention.
FIG. 4 is a schematic diagram of a voltage sampling circuit frame structure of the discharge electroscope of the present invention.
FIG. 5 is a schematic diagram of a circuit structure of a voltage sampling circuit of the discharge electroscope of the present invention.
Fig. 6 is a schematic structural diagram of the high altitude current clamp apparatus of the present invention.
Fig. 7 is a schematic circuit diagram of a control module in the high altitude current clamp apparatus according to the present invention.
Fig. 8 is a schematic structural diagram of a wireless synchronous digital current clamp according to the present invention.
Fig. 9 is a schematic diagram of a frame structure of each circuit in the wireless synchronous digital current clamp according to the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The present embodiment provides a capacitance test analysis apparatus, including:
the electricity testing discharging rod is used for discharging the electric quantity of each capacitor in the capacitor bank and testing the residual electric quantity of each capacitor;
the test host outputs the measurement voltage to the capacitor with the discharged electric quantity in the capacitor bank;
and a plurality of high altitude current clamp devices for testing the induced current in the capacitor bank circuit;
the high-altitude current clamp device is provided with a wireless synchronous digital current clamp, the wireless synchronous digital current clamp is in communication connection with the test host, and the test host receives and processes test data sent by the wireless synchronous digital current clamp.
As shown in fig. 1, the test host 101 includes a voltage transformer, a data analysis storage system, a wireless receiving module, and an ac voltage output power supply for inputting a test voltage to the capacitor bank circuit, where the voltage transformer is electrically connected to the data analysis storage system, the wireless receiving module is electrically connected to the data analysis storage system, and the wireless receiving module is further communicatively connected to the wireless synchronous digital current clamp 300. As shown in fig. 2, the alternating voltage output power supply adopts the SPWN algorithm inverter power supply technology to realize that the power frequency and variable frequency power supply outputs sinusoidal alternating current for testing, thereby improving the on-site anti-interference capability; the test host 101 mainly has three functions, the first is an alternating voltage output power supply, and a test voltage of sine alternating current is input into the circuit; the second is a voltage transformer which is equivalent to one end of a transformer and is used for collecting voltage signals fed back from the circuit; and the third is a data analysis and storage system which is mainly used for processing and storing the induced current signals received by the wireless receiving module and the voltage signals acquired by the voltage transformer.
As shown in fig. 3, the electricity testing discharging rod comprises a discharging connector 1, a connecting rod 2 and an operating end 3, wherein the discharging connector 1 is connected with the operating end 3 through the connecting rod 2, a voltage sampling circuit for collecting discharging data and a data transmitter for transmitting the discharging data are arranged at the discharging connector 1, the voltage sampling circuit is electrically connected with the data transmitter, the operating end is provided with a data receiver 4, a single chip microcomputer processing module and a display screen, the data transmitter is in communication connection with the data receiver, and the single chip microcomputer processing module processes the data received by the data receiver and displays the data through the display screen 5.
As shown in fig. 4, the voltage sampling circuit includes a hall isolation change output module, an impedance transformation module, a low-pass filter module, a data processing module, and a test contact module for contacting with a test point, an output end of the test contact module is electrically connected to an input end of the hall isolation change output module, an output end of the hall isolation change output module is electrically connected to an input end of the impedance transformation module, an output end of the impedance transformation module is electrically connected to an input end of the low-pass filter module, an output end of the low-pass filter module is electrically connected to an input end of the data processing module, and an output end of the data processing module is connected to an input end of the wireless transmission module; the specific circuit connection relationship is shown in fig. 5.
As shown in fig. 6, the high altitude current clamp apparatus further includes a current clamp wrench 201 located on the side wall of the wireless synchronous digital current clamp 300 and controlling the wireless synchronous digital current clamp 300 to open and close, one side of the wireless synchronous digital current clamp 300 is connected to a hollow insulating rod 202, a storage battery 203, an electric push rod 204 and a control module controlling the electric push rod 204 to extend and retract are arranged inside the insulating rod 202, the push rod of the electric push rod 204 is connected to the current clamp wrench 201 by passing through a PBO rope 206 and bypassing a fixed pulley 207, and the storage battery 203 is electrically connected to a motor of the electric push rod 204 through the control module.
As shown in fig. 7, the control module includes an electromagnetic relay set, an RF receiving module and a remote controller provided with an RF transmitting module, the power source is sequentially connected to the electromagnetic relay set and the motor of the electric push rod 204, the electromagnetic relay set is simultaneously connected to the RF receiving module, and the RF transmitting module is connected to the RF receiving module in a communication manner.
As shown in fig. 7, the electromagnetic relay group includes a first electromagnetic relay group and a second electromagnetic relay group, the first electromagnetic relay group includes an electromagnetic relay U1, a diode D1, a transistor Q1 and a resistor R1, the second electromagnetic relay group includes an electromagnetic relay U2, a diode D2, a transistor Q2 and a resistor R2, the power supply is a battery B1, and the positive electrode of the battery B1 is simultaneously and respectively electrically connected with the 6 interface of the electromagnetic relay U1, the 6 interface of the electromagnetic relay U2, the collector of the transistor Q1 and the collector of the transistor Q2; the negative electrode of the battery B1 is simultaneously electrically connected with the 1 interface of the electromagnetic relay U1, the 4 interface of the electromagnetic relay U1, the positive electrode of the diode, the 1 interface of the battery relay U2, the 4 interface of the battery relay U2 and the positive electrode of the diode; the emitting electrode of the triode Q1 is simultaneously and respectively electrically connected with the cathode of the diode and the 2 interface of the electromagnetic relay U1, and the base electrode of the triode Q1 is sequentially and electrically connected with the resistor R1 and the RF receiving module RF 1; the 5 interface of the electromagnetic relay U1 is electrically connected with the positive electrode interface of the motor, and the 3 interface of the electromagnetic relay U1 is electrically connected with the negative electrode interface of the motor; the emitting electrode of the triode Q2 is simultaneously and respectively electrically connected with the cathode of the diode and the 2 interface of the electromagnetic relay U2, and the base electrode of the triode Q2 is sequentially and electrically connected with the resistor R2 and the RF receiving module RF 2; the 3 interface of the electromagnetic relay U2 is electrically connected with the positive electrode interface of the motor, and the 5 interface of the electromagnetic relay U2 is electrically connected with the negative electrode interface of the motor; the battery relay U2 is characterized in that a first armature switch is connected between a 6 interface and a 5 interface of the battery relay U1, a second armature switch is connected between a 4 interface and a 3 interface, a first induction coil is connected between a 2 interface and a 1 interface, a third armature switch is connected between the 6 interface and the 5 interface of the battery relay U2, a fourth armature switch is connected between the 4 interface and the 3 interface, and a second induction coil is connected between the 2 interface and the 1 interface. Thus, when the remote controller presses the 'on' button, the triode Q1 is turned off, the triode Q2 is turned on, the reverse control relay coil is powered on, the normally open contact is closed, the motor is powered on, the electric push rod 204 makes retraction movement, the traction piece is tensioned, the current clamp wrench 201 is driven, the current clamp opening is opened, otherwise, when the remote controller presses the 'on' button, the triode Q1 is turned on, the triode Q2 is turned off, the relay coil is powered on by forward rotation control, the normally open contact is closed, the electric forward rotation is realized, the electric push rod 204 makes extension movement, the current clamp jaw is closed, when the remote controller presses the 'off' button, the triodes Q1 and Q2 are simultaneously closed, and the opening of the wireless synchronous digital current clamp 300 can be opened at any position.
As shown in fig. 8 and 9, the wireless synchronous digital current clamp 300 includes a plastic housing 302, two magnetic cores 301 capable of synthesizing a closed magnetic circuit are disposed on the plastic housing 302, a current sampling circuit, an amplifying and filtering circuit, an ADC conversion circuit, a single chip microcomputer, and a wireless transmitting module are disposed inside the plastic housing 302 (at position 304 in the figure), the current clamp wrench 201 controls the opening and closing of the closed magnetic circuit, the two magnetic cores 301 are connected by a torsion spring, two torsion arms of the torsion spring are respectively connected to the two magnetic cores 301, the current clamp wrench 201 is simultaneously connected to the two torsion arms of the torsion spring, and the rotation of the current clamp wrench 201 can compress the torsion spring; the torsion spring is packaged in a plastic shell 302, and the connection part of the magnetic core 301 and the torsion spring is located in the plastic shell. The ADC conversion circuit comprises an ADS1675, a power supply circuit and a zero-crossing detection circuit, one end of the ADS1675 is electrically connected with the output end of the amplification filter circuit, the other end of the ADS1675 is connected with the single chip microcomputer, and the power supply circuit and the zero-crossing detection circuit are respectively electrically connected with the single chip microcomputer; the output end of the current sampling circuit is connected with the input end of the amplifying and filtering circuit, the output end of the amplifying and filtering circuit is connected with the input end of the ADC conversion circuit, the output end of the ADC conversion circuit is connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is connected with the wireless transmitting module, and the wireless transmitting module is in communication connection with the wireless receiving module.
In this embodiment, the wireless transmitting module is a 2.4G wireless transmitting module, and the wireless receiving module is a 2.4G wireless receiving module.
In the whole working process, the discharge joint 1 of the electricity testing discharge rod is firstly utilized to contact the test point of the electric shock capacitor 103, the electric quantity reserved in the capacitor 103 is discharged, and in the discharge process, because the voltage sampling circuit collects voltage data in real time, the residual electric quantity can be observed in real time through the display screen, and the complete discharge is ensured; the discharging is a necessary process, after the discharging is completed, the testing host 101 is connected into a line to be tested, sine alternating current is input into the line through an alternating voltage output power supply, because the alternating current can generate current in the circuits of the capacitors 103, and then the wireless synchronous digital current clamp 300 is installed by using the high-altitude current clamp device; after the 'opening' button is pressed by the remote controller, another signal is transmitted to the RF receiving module by the RF transmitting module, after the RF receiving module receives the signal, the triode Q1 is turned off, the triode Q2 is conducted, the reverse rotation control relay coil is electrified, the normally open contact is closed, the motor of the electric push rod is electrified, the electric push rod 204 makes retraction movement, the traction piece is tensioned, the current clamp wrench 201 is driven, the opening of the wireless synchronous digital current clamp 300 is opened, on the contrary, when the 'closing' button is pressed by the remote controller, the triode Q1 is conducted, the triode Q2 is turned off, the forward rotation control relay coil is electrified, the normally open contact is closed, the electric forward rotation is realized, the electric push rod 204 makes extension movement, and the jaw of the wireless synchronous digital current clamp 300 is closed; therefore, zero contact between a tester and the power capacitor is realized through the high-altitude current clamp device, and the measuring current clamp is installed without high-altitude operation; after the 6 wireless synchronous digital current clamps 300 are respectively installed at a test point, the magnetic core 301 of the wireless synchronous digital current clamp 300 can generate induced current, the induced current is acquired by a current sampling circuit and then input to an amplifying and filtering circuit to amplify a current signal, the amplifying and filtering circuit is input to an ADC (analog-to-digital converter) circuit to convert a current analog signal into a digital signal, and then the digital signal is input to a single chip microcomputer and transferred to a wireless transmitting module, and the wireless transmitting module transmits the signal to a wireless receiving module in the test host 101 to realize the transmission of the signal; the whole process does not need the connection of cables, potential safety hazards caused by the winding of wires can be avoided, the stability of signal transmission is guaranteed, and the detection efficiency is effectively improved. After receiving the signal, the wireless receiving module of the test host 101 transmits the signal to the data analysis storage system for processing and storage, in addition, the voltage transformer can collect the voltage data in the circuit, and after analyzing the collected voltage and current data, the phase difference value and the amplitude ratio of the two fundamental wave signals are calculated, so that the absolute capacitance of the tested object is obtained, and the performance of the corresponding capacitor can be calculated.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A capacitive test analytical apparatus, comprising:
the electricity testing discharging rod is used for discharging the electric quantity of each capacitor in the capacitor bank and testing the residual electric quantity of each capacitor;
the test host outputs the measurement voltage to the capacitor with the discharged electric quantity in the capacitor bank;
and a plurality of high altitude current clamp devices for testing the induced current in the capacitor bank circuit;
the high-altitude current clamp device is provided with a wireless synchronous digital current clamp, the wireless synchronous digital current clamp is in communication connection with the test host, and the test host receives and processes test data sent by the wireless synchronous digital current clamp.
2. The capacitive test analytical apparatus of claim 1, wherein: the testing host comprises a voltage transformer, a data analysis and storage system, a wireless receiving module and an alternating current voltage output power supply, wherein the alternating current voltage output power supply is used for inputting testing voltage into the capacitor bank circuit, the voltage transformer is electrically connected with the data analysis and storage system, the wireless receiving module is electrically connected with the data analysis and storage system, and the wireless receiving module is further in communication connection with the wireless digital current clamp.
3. The capacitive test analytical apparatus of claim 2, wherein: electroscopic discharge rod including discharging and connecting, connecting rod and operation end, discharge and connect and pass through the connecting rod is connected the operation end, discharge and connect the department and be equipped with the voltage sampling circuit of the data of discharging of collection and the data transmitter of the data of discharging of transmission, voltage sampling circuit with data transmitter electric connection, the operation end is equipped with data receiver, singlechip processing module and display screen, data transmitter with data receiver communication connection, singlechip processing module handles data connect the received data of piece and pass through the display screen shows.
4. The capacitive test analytical apparatus of claim 3, wherein: the voltage sampling circuit comprises a Hall isolation change output module, an impedance conversion module, a low-pass filtering module, a data processing module and a test contact module used for being in contact with a test point, wherein the output end of the test contact module is electrically connected with the input end of the Hall isolation change output module, the output end of the Hall isolation change output module is electrically connected with the input end of the impedance conversion module, the output end of the impedance conversion module is electrically connected with the input end of the low-pass filtering module, the output end of the low-pass filtering module is electrically connected with the input end of the data processing module, and the output end of the data processing module is connected with the input end of the wireless transmitting module.
5. The capacitive test analytical apparatus of claim 4, wherein: the high-altitude current clamp device further comprises a current clamp wrench which is located on the side wall of the wireless synchronous digital current clamp and controls the wireless synchronous digital current clamp to open and close, one side of the wireless synchronous digital current clamp is connected with a hollow insulating rod, a power supply, an electric push rod and a control module for controlling the electric push rod to stretch are arranged inside the insulating rod, the push rod of the electric push rod is connected with the current clamp wrench through a PBO rope, and the power supply is electrically connected with the electric push rod through the control module.
6. The capacitive test analytical apparatus of claim 5, wherein: control module includes electromagnetic relay group, RF receiving module and is equipped with RF transmitting module's remote controller, the power in proper order with electromagnetic relay group with electric putter's motor electric connection, electromagnetic relay group simultaneously with RF receiving module electric connection, RF transmitting module with RF receiving module communication connection.
7. The capacitive test analytical apparatus of claim 6, wherein: the electromagnetic relay group comprises a first electromagnetic relay group and a second electromagnetic relay group, the first electromagnetic relay group comprises an electromagnetic relay U1, a diode D1, a triode Q1 and a resistor R1, the second relay group comprises an electromagnetic relay U2, a diode D2, a triode Q2 and a resistor R2, the power supply is a battery B1, the positive pole of the battery B1 is simultaneously and respectively connected with a 6 interface of the electromagnetic relay U1, a 6 interface of the electromagnetic relay U2, a collector of the triode Q1 and a collector of the triode Q2 in an electric connection mode; the negative electrode of the battery B1 is simultaneously electrically connected with the 1 interface of the electromagnetic relay U1, the 4 interface of the electromagnetic relay U1, the positive electrode of the diode, the 1 interface of the battery relay U2, the 4 interface of the battery relay U2 and the positive electrode of the diode; the emitting electrode of the triode Q1 is simultaneously and respectively electrically connected with the cathode of the diode and the 2 interface of the electromagnetic relay U1, and the base electrode of the triode Q1 is sequentially and electrically connected with the resistor R1 and the RF receiving module RF 1; the 5 interface of the electromagnetic relay U1 is electrically connected with the positive electrode interface of the motor, and the 3 interface of the electromagnetic relay U1 is electrically connected with the negative electrode interface of the motor; the emitting electrode of the triode Q2 is simultaneously and respectively electrically connected with the cathode of the diode and the 2 interface of the electromagnetic relay U2, and the base electrode of the triode Q2 is sequentially and electrically connected with the resistor R2 and the RF receiving module RF 2; the 3 interface of the electromagnetic relay U2 is electrically connected with the positive electrode interface of the motor, and the 5 interface of the electromagnetic relay U2 is electrically connected with the negative electrode interface of the motor; the battery relay U2 is characterized in that a first armature switch is connected between a 6 interface and a 5 interface of the battery relay U1, a second armature switch is connected between a 4 interface and a 3 interface, a first induction coil is connected between a 2 interface and a 1 interface, a third armature switch is connected between the 6 interface and the 5 interface of the battery relay U2, a fourth armature switch is connected between the 4 interface and the 3 interface, and a second induction coil is connected between the 2 interface and the 1 interface.
8. The capacitive test analytical apparatus of claim 7, wherein: the wireless synchronous digital current clamp comprises a plastic shell, wherein two magnetic cores capable of synthesizing a closed magnetic circuit are arranged on the plastic shell, a current sampling circuit for collecting induced current of the closed magnetic circuit, an amplifying and filtering circuit, an ADC (analog to digital converter) circuit, a single chip microcomputer and a wireless transmitting module are arranged in the plastic shell, the current clamp wrench controls the opening and closing of the closed magnetic circuit, the output end of the current sampling circuit is connected with the input end of the amplifying and filtering circuit, the output end of the amplifying and filtering circuit is connected with the input end of the ADC conversion circuit, the output end of the ADC conversion circuit is connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is connected with the wireless transmitting module, and the wireless transmitting module is in communication.
9. The capacitive test analytical apparatus of claim 7, wherein: the wireless transmitting module is a 2.4G wireless transmitting module, and the wireless receiving module is a 2.4G wireless receiving module.
10. The capacitive test analytical apparatus of any one of claims 1 to 9, wherein: the number of the high-altitude current clamp devices is 6.
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| CN110824258B (en) | 2024-06-14 |
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