CN111366787B - Method and equipment for testing direct current resistance of capacitor discharge coil - Google Patents

Method and equipment for testing direct current resistance of capacitor discharge coil Download PDF

Info

Publication number
CN111366787B
CN111366787B CN202010204886.7A CN202010204886A CN111366787B CN 111366787 B CN111366787 B CN 111366787B CN 202010204886 A CN202010204886 A CN 202010204886A CN 111366787 B CN111366787 B CN 111366787B
Authority
CN
China
Prior art keywords
correction
voltage
current
processor module
direct current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010204886.7A
Other languages
Chinese (zh)
Other versions
CN111366787A (en
Inventor
杨健
吕泽承
覃秀君
夏小飞
饶夏锦
苏毅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electric Power Research Institute of Guangxi Power Grid Co Ltd
Original Assignee
Electric Power Research Institute of Guangxi Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electric Power Research Institute of Guangxi Power Grid Co Ltd filed Critical Electric Power Research Institute of Guangxi Power Grid Co Ltd
Priority to CN202010204886.7A priority Critical patent/CN111366787B/en
Publication of CN111366787A publication Critical patent/CN111366787A/en
Application granted granted Critical
Publication of CN111366787B publication Critical patent/CN111366787B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • 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
    • G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The invention provides a method for testing the direct current resistance of a discharge coil of a capacitor, which is used for detecting the direct current resistance of the discharge coil in a high-voltage parallel capacitor device and comprises the following steps: the method comprises a testing wiring step, a testing control step, a target data acquisition step and a testing calculation step, wherein adjustable direct current voltage is applied to two ends of a discharging coil to be tested, a current sensor is adopted to select a tested branch circuit, and a processor and a corresponding relay are used for controlling so as to realize accurate measurement of milliampere level small current, so that the direct current resistance of the discharging coil is obtained, and the method has good implementation convenience. In addition, the invention also provides a device for testing the direct current resistance of the capacitor discharge coil.

Description

Method and equipment for testing direct current resistance of capacitor discharge coil
Technical Field
The invention relates to the field of detection, in particular to a method and equipment for testing direct-current resistance of a capacitor discharge coil.
Background
The high-voltage parallel capacitor device is important equipment for realizing reactive compensation in a power system, and the purpose of reactive regulation is achieved by switching the capacitor bank. However, when the capacitor bank is switched off, the presence of residual charges in the capacitive elements causes high transient overvoltages to occur, which endangers the insulation of the switching device. Therefore, a discharge coil is required to be connected in parallel with two ends of the parallel capacitor, so that residual charges in the parallel capacitor can be discharged quickly, the method is one of important technical measures for ensuring the safety of equipment and personnel, and meanwhile, the method also forms an important measuring device for protecting the voltage of the capacitor bank, so the method is widely applied to a power distribution network.
The standard dictates that the capacitor discharge coil must reduce the residual voltage of the capacitor from the nominal value to below 50V within 5s of discharge initiation. If the capacitor discharge coil breaks down, on one hand, the capacitor bank can not normally discharge residual charges easily, so that the equipment and personal safety are endangered, and on the other hand, voltage protection misoperation can be caused, so that the switch tripping is caused, and the safe and stable operation of a power grid is influenced. The measurement of the capacitor discharge coil, the measurement of its direct current resistance being a routine test item required by regulations, is therefore of particular importance.
In actual measurement, on one hand, the discharge coil has large inductance, and the equivalent direct current resistance of the discharge coil is usually 2k omega-4 k omega, so that the measurement current is only milliampere, and a universal meter cannot be directly adopted for accurate measurement; on the other hand, because the capacitor bank has a plurality of series-parallel branches, the universal meter cannot measure a single discharge coil. Furthermore, the measurement process reaches a steady state for a longer time due to the effect of the capacitor storing charge, and may even generate LC oscillations. At present, the existing discharge coil measuring mode can only be used for measuring by independently adopting a direct current resistance measuring instrument with higher precision after the discharge coil to be measured is dismantled, and the existing discharge coil measuring mode has the defects of complicated and time-consuming wire dismantling and reinstallation and increases the workload of maintainers. Therefore, a new technology for measuring the dc resistance of the discharge coil of the capacitor is needed to achieve the purpose of rapid and accurate measurement without disconnecting the wire.
Disclosure of Invention
The invention provides a method and a device for testing direct current resistance of a capacitor discharge coil, aiming at achieving the aim of quickly and accurately measuring the discharge coil of a high-voltage parallel capacitor device under the condition of not disconnecting.
A capacitor discharge coil direct current resistance test method is used for detecting the direct current resistance of a discharge coil in a high-voltage parallel capacitor device, wherein the high-voltage parallel capacitor device comprises the discharge coil arranged on the capacitor device in parallel;
the method comprises the following steps:
testing wiring: respectively connecting a first output interface and a second output interface of an output interface group of the relay control circuit to two ends of a branch where a discharge coil is located to form a test main loop, and clamping a current sensor on the test main loop;
and (3) testing and controlling: the processor module controls a test switch on a test branch of the relay control circuit to be closed, the test branch is connected into the test main loop, and the test branch comprises the test switch;
a target data acquisition step: under the accurate mode, the processor module controls the adjustable working power supply to output the adjustable power supply voltage U of the direct currentSSaid adjustable supply voltage USThe input voltage of the input interface group of the relay control circuit and the output voltage of the output interface group of the relay control circuit are both US；
The current sensor measures the current I of the main circuitfConverted into real-time feedback voltage UfBack to the processor module;
the processor module feeds back the voltage U according to the real-timefAdjusting the adjustable supply voltage USUntil the real-time feedback voltage UfCorrection voltage U of the kth group of correction data in the data tablepkEqual; at this time, the adjustable power supply voltage USIs a target voltage US0The real-time feedback voltage UfIs a target feedback voltage Uf0In the k-th group of correction data, the correction voltage UpkCorresponding correction current IpkIs a target current If0；
The processor module obtains a group of target data, wherein the target data is { U }S0,Uf0,If0}；
And (3) testing and calculating: the processor module calculates the direct current resistance of the discharge coil
Figure GDA0003550055920000021
The data table includes n sets of correction data { U }pi,Ipi, R pi1,2, …, n, wherein UpiCorrection voltage for ith group of correction data, IpiCorrection current, R, for ith group of correction datapiThe correction resistance value of the i-th correction data is k ∈ {1,2, …, n }.
In an optional embodiment, the data table is obtained based on a data table generating method, where the data table generating method includes:
and (3) correcting wiring: the method comprises the steps that a first output interface and a second output interface of an output interface group of a relay control circuit are in short circuit connection to form a closed correction main loop, and a current sensor is clamped on the correction main loop;
a correction control step: the processor module controls a correction switch on an ith correction branch in n correction branches of the relay control circuit to be closed, correction switches on the other correction branches in the n correction branches are kept to be disconnected, the ith correction branch is connected into the correction main circuit and comprises a correction resistor RpiAnd a corresponding correction switch;
a correction data acquisition step: adjustable power supply voltage for controlling adjustable working power supply to output direct current by processor module
Figure GDA0003550055920000031
The adjustable supply voltage
Figure GDA0003550055920000032
The correction resistor R is the input voltage of the input interface group of the relay control circuitpiA voltage across the terminals of
Figure GDA0003550055920000033
The current sensor corrects the correction current I of the main looppiCorrection voltage U converted into real-time feedbackpiBack to the processor module;
a correction calculation step: processor deviceBlock calculating correction current for correcting main loop
Figure GDA0003550055920000034
Get the i-th group of correction data { Upi,Ipi,Rpi}；
And repeatedly executing the correction wiring step, the correction control step, the correction data acquisition step and the correction calculation step to obtain n groups of correction data.
In an optional embodiment, the target data acquiring step further includes:
in the fast mode, a correction function curve f (I)p',Up') fitting I of said n sets of correction data based on least squarespiAnd Upi，Ip' As fitting Current, Up' is the fitted feedback voltage;
adjustable power supply voltage U for controlling adjustable working power supply to output direct current by processor moduleS', said adjustable supply voltage US' is the input voltage of the input interface group of the relay control circuit, and the output voltage of the output interface group of the relay control circuit is US'; the adjustable power supply voltage USIs a target voltage US0；
The current sensor measures the current I of the main test loopfConverted into real-time feedback voltage UfBack to the processor module, the real-time feedback voltage UfIs a target feedback voltage Uf0；
The target feedback voltage U is measuredf0As a fitting feedback voltage Up' substitution into the correction function curve f (I)p',Up') obtaining a corresponding fitting current, said corresponding fitting current being the target current If0；
The processor module obtains a group of target data, wherein the target data is { USo,Ufo,Ifo}。
In an optional embodiment, the capacitor discharge coil dc resistance test method further includes a discharging step, the discharging step is performed after the test calculating step, and the discharging step includes:
a discharge control step: the processor module controls a discharging switch on a discharging branch of the relay control circuit to be closed to form a discharging main loop, and the discharging branch comprises a discharging switch and a discharging resistor.
Correspondingly, the invention also provides a device for testing the direct current resistance of the capacitor discharge coil, which is used for realizing the method for testing the direct current resistance of the capacitor discharge coil.
In summary, the invention provides a method and a device for testing the direct current resistance of a capacitor discharge coil, which apply adjustable direct current voltage on two ends of the tested discharge coil, adopt a current sensor to realize the selection of a tested branch circuit under the condition of not disconnecting the circuit, and realize the rapid and accurate measurement of milliampere level small current and the safe discharge function through a processor module and a corresponding relay control circuit, thereby obtaining the direct current resistance of the high-voltage parallel capacitor discharge coil and having good implementation convenience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram showing the structure of a capacitor discharge coil DC resistance test device according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a power supply circuit of an embodiment of the invention;
FIG. 3 shows a processor architecture diagram of STM32F103 xx;
FIG. 4 shows a schematic flow chart of a capacitor discharge coil DC resistance test method of an embodiment of the present invention;
FIG. 5 is a schematic diagram of a calibration circuit for measuring DC resistance of a capacitor discharge coil according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a measuring circuit for measuring the DC resistance of a capacitor discharge coil according to an embodiment of the present invention;
fig. 7 shows a schematic circuit configuration diagram of the device for measuring the direct current resistance of the capacitor discharge coil in the discharge of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Before explaining the capacitor discharge coil direct-current resistance testing method related to the invention, for convenience of understanding, the embodiment of the invention first provides one of capacitor discharge coil direct-current resistance testing devices, and then, the capacitor discharge coil direct-current resistance testing method related to the invention is explained by combining the capacitor discharge coil direct-current resistance testing devices.
Capacitor discharge coil direct current resistance test equipment
Fig. 1 shows a schematic structural diagram of a capacitor discharge coil direct-current resistance testing device according to an embodiment of the invention.
Specifically, the embodiment of the invention provides a capacitor discharge coil direct current resistance testing device which comprises a power supply circuit, peripheral equipment, an adjustable working power supply, a current sensor, a processor module and a relay control circuit.
Relay control circuit
In the embodiment of the invention, the relay control circuit comprises an input interface group, an output interface group, a test branch, a plurality of correction branches and a discharge branch.
Specifically, the input interface group includes a first input interface and a second input interface, and the output interface group includes a first output interface and a second output interface. Since the circuit connection generally includes a positive electrode and a negative electrode (which may be understood as a ground electrode), the input interface set and the output interface set respectively have two interfaces, in the embodiment of the present invention, the first input interface may be understood as a positive input interface, and the first output interface may be understood as a positive output interface; the second input interface and the second output interface can be understood as ground wires, and correspondingly, the second input interface and the second output interface are directly connected to form the ground wire. In this embodiment, the first input interface, the second input interface, the first output interface, and the second output interface are all connected to a device or a module outside the relay control circuit, and for the whole circuit in which the relay control circuit actually participates, different circuit effects can be achieved by connecting different branches between the first input interface and the first output interface or between the second input interface and the second output interface. The actual participating operation circuit between the input interface group and the output interface group is a main loop of the relay control circuit.
Specifically, in the embodiment of the present invention, any one of the plurality of calibration branches and the test branch are connected in parallel between the first input interface and the first output interface, that is, a plurality of parallel branches are arranged between the first input interface and the first output interface, and the plurality of parallel branches include a plurality of calibration branches and a test branch.
Specifically, the test branch comprises a test switch.
Specifically, any one of the plurality of correction branches includes a correction switch and a correction resistor, which are arranged in series, and the resistance values of the correction resistors of different correction branches in the plurality of correction branches are different.
The correction switches in the plurality of correction branches and the test switches in the test branches are respectively provided with a switch control end and a switch driving end.
Through the arrangement mode, when the branch circuit needs to be applied to a certain branch circuit or a plurality of branch circuits are combined and applied, the switch on the corresponding branch circuit is closed; because the switch adopts the mode of signal control, the switch in each branch road is controlled respectively to processor module accessible corresponding type signal, need not realize the purpose that changes the circuit return circuit through the change of physics operation control circuit structure in the actual operation to realize multiple circuit function, have good operation convenience.
Specifically, since the capacitor discharge coil direct-current resistance test equipment of the embodiment of the invention needs to be used for actual measurement of a high-voltage parallel capacitor device, in order to ensure the use safety, the relay control circuit of the embodiment of the invention further comprises a discharge branch; two ends of the discharge branch are respectively connected between the first output interface and the second output interface; the discharge branch circuit comprises a discharge switch and a discharge resistor which are arranged in series; the discharge switch of the discharge branch has a switch control end and a switch driving end.
Similar to the correction branch and the test branch, the discharging switch is controlled through the processor module, the opportunity of accessing the discharging branch into the circuit loop can be controlled, discharging is fast, operation is convenient, and the device has good practicability and safety.
Adjustable working power supply
Specifically, the adjustable working power supply is provided with a voltage regulation output end and a voltage regulation control end, and the voltage regulation output end is connected with the input interface group; it should be noted that, in practice, the voltage regulating output terminal has a positive output terminal and a negative output terminal (ground terminal), and correspondingly, the positive output terminal and the negative output terminal of the voltage regulating output terminal are respectively connected to the first input interface and the second input interface of the relay control circuit.
The voltage regulation control end is mainly used for the adjustable working power supply to output corresponding output voltage according to an external voltage regulation signal.
In the embodiment of the invention, the adjustable direct current power supply converts 220V alternating current commercial power into direct current power for output, and the voltage output range is 0V-50V.
Current sensor
The current sensor has a current signal output and a test terminal. The test end is used for obtaining a current value of the target circuit, and the current signal output end is used for outputting the obtained current value of the target circuit; specifically, the current value of the target circuit is output to the processor module in the form of a voltage signal, and the processor module converts the voltage signal into the current value according to a data corresponding relation which is built in the processor module and corresponds to the specific current sensor.
In order to facilitate operation, the current sensor in the embodiment of the invention adopts an open Hall current sensor, the model is HKCT100-5, and the caliber is 40 mm. In specific implementation, the current sensor is only required to be clamped on a loop of a target circuit, so that the operation is convenient, and the practicability is good.
Power supply circuit
Fig. 2 shows a schematic structural diagram of a power supply circuit of an embodiment of the present invention. The power supply circuit is provided with a power supply input end and a power supply output end, and the power supply output end is respectively connected with a part or a circuit needing power supply. In specific use, the capacitor discharge coil direct-current resistance testing equipment provided by the embodiment of the invention is generally directly connected to commercial power for operation, so that the power supply input end is connected to the commercial power, and the power supply circuit converts the commercial power into specific voltage for output. Specifically, the specific required power supply circuit configuration may also be changed accordingly, depending on the type of component selected. For various common component models in the prior art, optionally, the power supply circuit includes a direct connection circuit, a first conversion circuit and a second conversion circuit; the number of the power supply output ends is multiple.
It should be noted that the power supply circuit according to the embodiment of the present invention directly uses the commercial power (220V ac power) to supply power, and therefore the following contents related to voltage conversion are mainly implemented for the commercial power.
Direct connection circuit: the input end of the direct connection circuit is connected with the power supply input end, the voltage of the output end of the direct connection circuit is the same as that of the input end of the direct connection circuit, and the output end of the direct connection circuit is electrically connected with one of the plurality of power supply output ends; the direct connection circuit is used for directly outputting commercial power. In the embodiment of the invention, the direct connection circuit can be used for supplying power to the adjustable working power supply.
A first conversion circuit: the input end of the first conversion circuit is connected with the power supply input end, the voltage of the output end of the first conversion circuit is direct current 12V, and the output end of the first conversion circuit is electrically connected with one power supply output end of the plurality of power supply output ends; specifically, the implementation structure of the first conversion circuit can refer to the schematic structural diagram of the first conversion circuit shown in fig. 2, where J1 is a 220 ac input interface, i.e., a power supply input terminal; f1 is insurance; c1 is a safety capacitor for protecting human body, so that the human body cannot be electrified after the electric contact circuit is broken; r1 is a voltage dependent resistor which clamps the voltage after overvoltage, so that the circuit voltage can not exceed the threshold value allowed by the voltage dependent resistor; t1 is a transformer for stepping down 220V AC to 12V voltage; D1-D4 are diodes with model number IN4007, and are used for forming a rectifier bridge to convert the alternating current 12V voltage into the direct current 12V voltage; c2 and C3 are a filter capacitor and a voltage stabilizing capacitor, respectively. Through the arrangement of the first conversion circuit, the power supply circuit can output 12V direct current voltage. In the embodiment of the invention, the first conversion circuit can be used for supplying power to the switch driving end of each control switch in the relay control circuit.
A second conversion circuit: the input end of the second conversion circuit is connected with the power supply input end, the voltage of the output end of the second conversion circuit is direct current 5V, and the output end of the second conversion circuit is electrically connected with one of the power supply output ends. In specific implementation, the structure of the second conversion circuit can be similar to that of the first conversion circuit, and only the model of the transformer needs to be replaced. In an embodiment of the invention, the second switching circuit may be used for powering the processor module.
In specific implementation, the first conversion circuit and the second conversion circuit are mainly used for supplying power to peripheral equipment and a processor module, and can be used according to actual conditions in specific implementation.
In the structure shown in fig. 1 of the accompanying drawings, since the specific power supply condition of the power supply circuit needs to be confirmed according to the form of actual setting, fig. 1 of the accompanying drawings only shows the power supply condition of the power supply circuit to the processor module, and the power supply of the power supply circuit to the rest of the devices or circuits needs to be adaptively adjusted in combination with the actual implementation.
Peripheral equipment
Specifically, since the embodiments of the present invention relate to different operation contents required by the processor module in different steps, in order to facilitate control of the processor module, a display device for displaying the content of the processor module and a control device for controlling the processor module are generally required to be added.
Specifically, the control device may be a controller, and the plurality of peripheral devices include a controller; the processor module is provided with a control receiving end which is connected with the controller. In specific implementation, the controller may be peripheral input devices such as buttons, knobs, keyboards, and mice.
Specifically, the plurality of peripheral devices include a display screen; the processor module is provided with a display output end, and the display output end is connected with the display screen.
Processor module
The processor module is provided with a voltage regulation output end, a current signal receiving end, a test switch end, a plurality of correction switch ends and a discharge switch end; the voltage regulating output end is connected with the voltage regulating control end, and the current signal receiving end is connected with the current signal output end; the test switch end is connected with the control end of the test switch, and the plurality of correction switch ends are respectively connected with the control ends of the correction switches of the plurality of correction branches; and the discharge switch end is connected with the control end of the discharge switch.
Specifically, the processor module plays a role in data receiving, circuit control and signal output.
Fig. 3 shows a processor architecture diagram of STM32F103 xx. In particular implementations, the processor module may be based on the STM32F103xx family of processors. STM32F103xx uses a high performance ARM Cortex-M332 bit RISC core; specifically, the processor comprises an ADC (Analog-to-Digital Converter), a universal 16-bit timer, a PWM timer and a communication interface; generally, the communication interfaces include an I2C interface, an SPI interface, a USART interface, a USB interface, and a CAN interface (the communication interfaces described above are all interfaces of specific protocols).
Specifically, the ADC interface may be configured to be connected to a current sensor, and obtain an analog signal fed back by the current sensor; the GPIO interface (general purpose input/output interface) can be used for being connected with the switch control end of the switch of each branch circuit so as to control each branch circuit to be connected into the overall loop; the SPI interface can be used for being connected with a voltage regulation control end of the adjustable working power supply so as to realize the control of the processor module on the output voltage of the adjustable working power supply; as for the peripheral devices, the peripheral devices may be connected through specific interfaces such as an I2C interface, an SPI interface, a USART interface, a USB interface, and a CAN interface according to specific models, which is not necessarily described in the embodiments of the present invention.
In specific implementation, because the correction branch, the test branch and the discharge branch are built in the relay control circuit, the control of different branch access circuit loops can be realized through the signal control of the processor module, so that the method for testing the direct current resistance of the capacitor discharge coil can be quickly realized, and the method is convenient in practical application and has good practicability.
Correspondingly, the embodiment of the invention provides a method for testing the direct-current resistance of the capacitor discharge coil, and the following description is made by combining the device for testing the direct-current resistance of the capacitor discharge coil provided by the embodiment of the invention.
Method for testing direct current resistance of capacitor discharge coil
Fig. 4 shows a flow chart of the capacitor discharge coil dc resistance test method according to an embodiment of the present invention. The method for testing the direct current resistance of the capacitor discharge coil comprises the following steps:
s101: calibrating a current sensor and obtaining a data sheet for the current sensor:
when the current sensor works, the data of the current sensor is transmitted through an analog signal (a voltage signal), and the processor module receives the analog signal, converts the analog signal into a digital signal and converts the digital signal into a current value according to a preset corresponding relation (the corresponding relation between the voltage signal and the current value); since each current sensor has individual difference, the preset corresponding relationship provided by the manufacturer when leaving the factory is not completely accurate, and therefore, the current sensors need to be corrected.
Specifically, the purpose of correcting the current sensor is to find out the corresponding correction current according to the correction voltage of the current sensor. This step may not be required if the current sensor has completed calibration within a short period of time before use.
It should be noted that, in the specific implementation, to complete the correction of the current sensor, a large amount of data needs to be tested, and the embodiment of the present invention only needs to obtain a plurality of (a small amount of) accurate data corresponding relation data, that is, a plurality of (a small amount of) correction voltages and correction currents corresponding to the correction voltages, according to a required specific application scenario.
Specifically, the data table generating method includes:
s201: and (3) correcting wiring:
in the embodiment of the present invention, in step S101, the capacitor discharge coil dc resistance test device needs to be wired first. Specifically, a first output interface and a second output interface of an output interface group of the relay control circuit are in short circuit connection to form a closed correction main loop, and a current sensor is clamped on the correction main loop; the current sensor is used for acquiring the current of the correction main loop. After the wiring, the specific circuit schematic diagram can refer to the structural schematic diagram of the correction circuit shown in fig. 5.
S202, correction control step:
the processor module controls a correction switch on an ith correction branch in n correction branches of the relay control circuit to be closed, correction switches on the other correction branches in the n correction branches are kept to be disconnected, the ith correction branch is connected into the correction main circuit and comprises a correction resistor RpiAnd corresponding correction switches; specifically, the circuit for acquiring each set of correction data can be simplified to the circuit structure shown in fig. 5.
Note that the correction resistor R ispiAre all known; in the embodiment of the invention, each access of the correction branch of the correction main loopIs equal to the resistance of the correction resistor in the correction branch connected to the correction main loop. Specifically, the resistance values of the correction resistors between each set of correction branches are different. In the embodiment of the invention, the resistance value range of the correction resistor can be 1k omega-5 k omega by considering the resistance value of the actual discharge coil.
Specifically, the number of correction branches is denoted by n, i is 1,2, …, n. In the embodiment of the invention, n is 5, i is 1,2,3,4, 5.
Specifically, the processor module enables the adjustable working power supply to output adjustable power supply voltage U to the input interface group of the relay control circuits(ii) a In the embodiment of the invention, Us48V. It should be noted that the adjustable supply voltage UsOutput voltage, U, for adjustable operating power supply onlysThe value is not constant and may be adjusted as desired for implementation.
In the embodiment of the invention, the resistance value of the correction resistor of each group of correction branches is Rp1＝1kΩ、Rp2＝2kΩ、Rp3＝3kΩ、Rp4＝4kΩ、Rp5＝5kΩ。
S203, correction data acquisition step:
adjustable power supply voltage for controlling adjustable working power supply to output direct current by processor module
Figure GDA0003550055920000111
The adjustable supply voltage
Figure GDA0003550055920000112
The correction resistor R is the input voltage of the input interface group of the relay control circuitpiA voltage across the terminals of
Figure GDA0003550055920000113
S204: a correction calculation step:
the processor module calculates the correction current of the ith path of correction branch
Figure GDA0003550055920000114
Get the i-th group of correction data { Upi,Ipi,Rpi}。
And repeatedly executing the correction wiring step, the correction control step, the correction data acquisition step and the correction calculation step to obtain n groups of correction data.
In S101, when the correction is started, the processor module closes the correction switch of the ith correction branch circuit first to enable the ith correction branch circuit to be accessed into the main circuit; then the processor module drives the adjustable working power supply to output adjustable power supply voltage
Figure GDA0003550055920000121
(48V is taken as an example in the embodiment of the invention) to the input interface group of the relay control circuit, and then the processor module synchronously receives the correction voltage U which is sent by the current sensor and corresponds to the discharge coil of the ith correction branch circuitpi(ii) a Then, the processor module calculates the correction current of the ith correction branch
Figure GDA0003550055920000122
Through the above embodiments, several groups (five groups in the embodiment of the present invention) of accurate correction voltages U can be obtainedpiAnd correction current IpiSo that the processor module can use the correction voltage U fed back by the current sensorpiFinding the exact corresponding correction current Ipi。
Specifically, the data measured in the examples of the present invention are shown in the following table:
Figure GDA0003550055920000123
in specific implementation, all correction data are collected to form a data table, and the data table comprises n groups of correction data { Upi,Ipi, R pi1,2, …, n, wherein UpiCorrection voltage for ith group of correction data, IpiCorrection current, R, for ith group of correction datapiIs the ith groupAnd correcting the correction resistance value of the data, wherein i is 1,2, …, n.
Through the S101, the corresponding relations of a plurality of data in the current sensor can be corrected to obtain a data table; the data table is synchronously updated into the processor module so that the processor module can accurately obtain the current size data (correction current I) actually transmitted by the current sensor according to the voltage signal fed back by the current sensorpi)。
S102: testing wiring;
specifically, after the data table is obtained in step S101, the capacitor discharge coil dc resistance test device needs to be connected to the working circuit where the discharge coil is located, and accordingly, new wiring needs to be performed on the capacitor discharge coil dc resistance test device.
Respectively connecting a first output interface and a second output interface of an output interface group of the relay control circuit to two ends of the discharge coil, and clamping the current sensor on a branch circuit where the discharge coil to be measured is located; specifically, fig. 6 shows a schematic circuit diagram of a circuit configuration for measuring the dc resistance of the capacitor discharge coil according to an embodiment of the present invention. The operating circuit in which the discharge coil is located essentially comprises a capacitor device (indicated by a capacitance symbol in fig. 6) and a corresponding discharge coil, which is connected in parallel to said capacitor device.
S103: a test control step;
the processor module controls a test switch on a test branch of the relay control circuit to be closed to form a test main loop, and the test branch comprises the test switch;
after step S103, a schematic circuit configuration diagram of the capacitor discharge coil dc resistance test apparatus according to the embodiment of the present invention is shown in fig. 6.
S104: a target data acquisition step:
specifically, the acquisition of the target data in the embodiment of the present invention has two modes, namely, an accurate mode and a fast mode.
Specifically, in the precision mode, the processor module controls the adjustable working power supply to output the adjustable power supply voltage U of the direct currentSSaid adjustable supply voltage USThe input voltage of the input interface group of the relay control circuit and the output voltage of the output interface group of the relay control circuit are both US(ii) a In the embodiment of the invention, the boosting stop condition is the adjustable power supply voltage USAnd the output voltage upper limit value of 50V or the output current upper limit value of 100mA is reached. When the boosting stop condition is reached, the adjustable power supply voltage U can be obtainedS。
The current sensor converts the current I of the branch in which the discharge coil is positioned intofConverted into real-time feedback voltage UfBack to the processor module;
the processor module feeds back the voltage U according to the real-timefAdjusting the adjustable supply voltage USUntil the real-time feedback voltage UfCorrection voltage U of the kth group of correction data in the data tablepkEqual; at this time, the adjustable power supply voltage USIs a target voltage US0The real-time feedback voltage UfIs a target feedback voltage Uf0In the k-th group of correction data, the correction voltage UpkCorresponding correction current IpkIs a target current If0；
The processor module obtains a group of target data, wherein the target data is { U }S0,Uf0,If0}。
In particular, in the fast mode, a correction function curve f (I)p',Up') fitting I of said n sets of correction data based on least squarespiAnd Upi，IpIs a fitting current, Up' is the fitted feedback voltage;
adjustable power supply voltage U for controlling adjustable working power supply to output direct current by processor moduleS', the adjustable supply voltage US' is the input voltage of the input interface group of the relay control circuit, and the output voltage of the output interface group of the relay control circuit is US'; the adjustable power supply voltage USIs a target voltage US0；
The current sensor converts the electricity of the branch in which the discharge coil is positionedStream IfConverted into real-time feedback voltage UfTransmitting back to the processor module, and feeding back the voltage U in real timefIs a target feedback voltage Uf0；
The target feedback voltage U is measuredf0As fitting feedback voltage Up' substituting into the correction function curve f (I)p',Up') obtaining a corresponding fitting current, said corresponding fitting current being the target current If0；
The processor module obtains a group of target data, wherein the target data is { USo,Ufo,Ifo}。
In step S104, the final goal is to obtain a set of target data { U }So,Ufo,Ifo}。
S105: calculating;
specifically, the processor module calculates the direct current resistance of the discharge coil
Figure GDA0003550055920000141
S106: discharging;
after step S105 is completed, the capacitor needs to be fully discharged.
The discharging step includes:
s301, a discharge control step:
the processor module controls a discharging switch on a discharging branch of the relay control circuit to be closed, and simultaneously opens a testing switch on the testing branch to form a discharging main loop, wherein the discharging branch comprises a discharging switch and a discharging resistor. The residual charge on the capacitor can be drained through the discharge primary circuit. In the embodiment of the invention, the discharge starting condition is the adjustable power supply voltage USAnd reduced to 0V.
Specifically, a schematic diagram of a discharge circuit structure of the capacitive discharge coil dc resistance testing device is shown in fig. 7.
In summary, the embodiments of the present invention provide a method and an apparatus for testing the direct current resistance of a capacitor discharge coil, which can implement the calibration of a current sensor, the measurement of the direct current resistance of the capacitor discharge coil, and the discharge function of a high-voltage parallel capacitor device by access control of a processor module to different branches and different wiring modes, and have good operation convenience; the current sensor adopts a current clamp structure, the discharge coil can realize the measurement and calculation of the direct current resistance of the discharge coil without being detached, and the current sensor is convenient to use and has good practicability.
The method and the device for testing the direct current resistance of the capacitor discharge coil provided by the embodiment of the invention are described in detail, a specific example is applied in the method to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (4)

1. A capacitor discharge coil direct current resistance test method is used for detecting the direct current resistance of a discharge coil in a high-voltage parallel capacitor device, wherein the high-voltage parallel capacitor device comprises the discharge coil arranged on the capacitor device in parallel;
it is characterized by comprising the following steps:
testing wiring: respectively connecting a first output interface and a second output interface of an output interface group of the relay control circuit to two ends of a branch where a discharge coil is located to form a test main loop, and clamping a current sensor on the test main loop;
and (3) testing and controlling: the processor module controls a test switch on a test branch of the relay control circuit to be closed, the test branch is connected into the test main loop, and the test branch comprises the test switch;
a target data acquisition step: under the accurate mode, the processor module controls the adjustable working power supply to output the adjustable power supply voltage U of the direct currentSSaid adjustable supply voltage USFor the input voltage of the input interface set of the relay control circuit, the relay controlThe output voltage of the output interface group of the circuit is US；
The current sensor measures the current I of the main test loopfConverted into real-time feedback voltage UfBack to the processor module;
the processor module feeds back the voltage U according to the real-timefAdjusting the adjustable supply voltage USUntil the real-time feedback voltage UfCorrection voltage U of the kth group of correction data in the data tablepkEqual; at this time, the adjustable power supply voltage USIs a target voltage US0The real-time feedback voltage UfIs a target feedback voltage Uf0In the k-th group of correction data, the correction voltage UpkCorresponding correction current IpkIs a target current If0；
The processor module obtains a group of target data, wherein the target data is { US0,Uf0,If0}；
And (3) testing and calculating: the processor module calculates the direct current resistance of the discharge coil
Figure FDA0003550055910000011
The data table includes n sets of correction data { U }pi,Ipi,Rpi1,2, …, n, wherein UpiCorrection voltage for ith group of correction data, IpiCorrection current, R, for ith group of correction datapiThe correction resistance value of the ith correction data is k ∈ {1,2, …, n };
each group of correction data represents correction current obtained by applying corresponding correction voltage to two ends of a correction resistor and calculating, wherein the correction voltage and the correction resistor are confirmation values, and the correction current value reflects the actual current of the current sensor;
the data table generation method comprises the following steps:
and (3) correcting wiring: the method comprises the steps that a first output interface and a second output interface of an output interface group of a relay control circuit are in short circuit connection to form a closed correction main loop, and a current sensor is clamped on the correction main loop;
a correction control step: the processor module controls a correction switch on an ith correction branch in n correction branches of the relay control circuit to be closed, correction switches on the other correction branches in the n correction branches are kept to be disconnected, the ith correction branch is connected into the correction main circuit and comprises a correction resistor RpiAnd a corresponding correction switch;
a correction data acquisition step: adjustable power supply voltage for controlling adjustable working power supply to output direct current by processor module
Figure FDA0003550055910000021
The adjustable supply voltage
Figure FDA0003550055910000022
The correction resistor R is the input voltage of the input interface group of the relay control circuitpiA voltage across both ends of
Figure FDA0003550055910000023
The current sensor corrects the correction current I of the main looppiCorrection voltage U converted into real-time feedbackpiBack to the processor module;
a correction calculation step: the processor module calculates correction current for correcting the main loop
Figure FDA0003550055910000024
Get the i-th group of correction data { Upi,Ipi,Rpi}；
And repeatedly executing the correction wiring step, the correction control step, the correction data acquisition step and the correction calculation step to obtain n groups of correction data.
2. The capacitor discharge coil direct current resistance test method according to claim 1, wherein the target data acquisition step further comprises:
in the fast mode, a correction function curve f (I)p',Up') fitting I of said n sets of correction data based on least squarespiAnd Upi，IpIs a fitting current, Up' is the fitted feedback voltage;
adjustable power supply voltage U for controlling adjustable working power supply to output direct current by processor moduleS', the adjustable supply voltage US' is the input voltage of the input interface group of the relay control circuit, and the output voltage of the output interface group of the relay control circuit is US'; the adjustable power supply voltage USIs a target voltage US0；
The current sensor measures the current I of the main circuitfConverted into real-time feedback voltage UfTransmitting back to the processor module, and feeding back the voltage U in real timefIs a target feedback voltage Uf0；
The target feedback voltage U is measuredf0As fitting feedback voltage Up' substitution into the correction function curve f (I)p',Up') obtaining a corresponding fitting current, said corresponding fitting current being the target current If0；
The processor module obtains a group of target data, wherein the target data is { USo,Ufo,Ifo}。
3. The capacitor discharge coil direct current resistance test method according to claim 1, wherein the capacitor discharge coil direct current resistance test method further comprises a discharging step, the discharging step being performed after the test calculating step, the discharging step comprising:
a discharge control step: the processor module controls a discharging switch on a discharging branch of the relay control circuit to be closed to form a discharging main loop, and the discharging branch comprises a discharging switch and a discharging resistor.
4. A capacitor discharge coil direct current resistance test apparatus for implementing the capacitor discharge coil direct current resistance test method according to any one of claims 1 to 3.
CN202010204886.7A 2020-03-22 2020-03-22 Method and equipment for testing direct current resistance of capacitor discharge coil Active CN111366787B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010204886.7A CN111366787B (en) 2020-03-22 2020-03-22 Method and equipment for testing direct current resistance of capacitor discharge coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010204886.7A CN111366787B (en) 2020-03-22 2020-03-22 Method and equipment for testing direct current resistance of capacitor discharge coil

Publications (2)

Publication Number Publication Date
CN111366787A CN111366787A (en) 2020-07-03
CN111366787B true CN111366787B (en) 2022-07-12

Family

ID=71211935

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010204886.7A Active CN111366787B (en) 2020-03-22 2020-03-22 Method and equipment for testing direct current resistance of capacitor discharge coil

Country Status (1)

Country Link
CN (1) CN111366787B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112748273A (en) * 2020-12-29 2021-05-04 广东电网有限责任公司电力科学研究院 Real-time voltage monitoring circuit for discharge coil of high-voltage parallel capacitor bank
CN112816783A (en) * 2020-12-31 2021-05-18 广东电网有限责任公司 Device and method for measuring direct current resistance of reactor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172067A (en) * 1991-05-20 1992-12-15 Commonwealth Edison Company Apparatus for determining DC resistance in high voltage winding with nonlinear resistance energy dissipation circuit
CN202093095U (en) * 2011-06-09 2011-12-28 上海市电力公司 Direct-current resistance tester for transformer
CN105842556A (en) * 2016-03-03 2016-08-10 国网浙江省电力公司电力科学研究院 Single-phase parallel capacitor-discharge coil discharge process calculation method
CN108226645A (en) * 2018-01-03 2018-06-29 宁波送变电建设有限公司 A kind of vacuum circuit breaker divide-shut brake coil direct current resistance m easurem ent device
CN109599263A (en) * 2018-10-17 2019-04-09 国网浙江省电力有限公司绍兴供电公司 A kind of design method of amorphous core repid discharge coil
CN208752434U (en) * 2018-11-05 2019-04-16 国网浙江省电力有限公司舟山供电公司 A kind of power supply device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172067A (en) * 1991-05-20 1992-12-15 Commonwealth Edison Company Apparatus for determining DC resistance in high voltage winding with nonlinear resistance energy dissipation circuit
CN202093095U (en) * 2011-06-09 2011-12-28 上海市电力公司 Direct-current resistance tester for transformer
CN105842556A (en) * 2016-03-03 2016-08-10 国网浙江省电力公司电力科学研究院 Single-phase parallel capacitor-discharge coil discharge process calculation method
CN108226645A (en) * 2018-01-03 2018-06-29 宁波送变电建设有限公司 A kind of vacuum circuit breaker divide-shut brake coil direct current resistance m easurem ent device
CN109599263A (en) * 2018-10-17 2019-04-09 国网浙江省电力有限公司绍兴供电公司 A kind of design method of amorphous core repid discharge coil
CN208752434U (en) * 2018-11-05 2019-04-16 国网浙江省电力有限公司舟山供电公司 A kind of power supply device

Also Published As

Publication number Publication date
CN111366787A (en) 2020-07-03

Similar Documents

Publication Publication Date Title
CN111366787B (en) Method and equipment for testing direct current resistance of capacitor discharge coil
US9274201B2 (en) Automatic calibration method for active and reactive power measurement
RU174066U1 (en) Relay Test Device
CN109975586B (en) Constant-current electronic load circuit and working method thereof
CN105842510A (en) Electronic transformer with self-calibration function and self-calibration method thereof
US9759761B2 (en) Method and apparatus for monitoring capacitor bushings for a three-phase AC system
CN1928571B (en) AC voltage sampling method and system
CN101887085A (en) Zinc oxide arrester DC characteristic testing device and method
CN212207514U (en) Relay control circuit and capacitor discharge coil direct current resistance test equipment
CN111579892B (en) Test system and method for cascaded SVG power module
CN115267592A (en) Test system
CN116755021B (en) Calibrating device and calibrating method for direct-current high-voltage divider
CN108181600B (en) Capacitor voltage transformer testing device
JP2004077251A (en) Performance test system of protection relay
CN113125839A (en) Non-isolated voltage sampling circuit, voltage sampling system and electric quantity metering device
CN110794354A (en) Alternating current-to-direct current function calibrator for insulation monitoring device and application method thereof
US5144227A (en) Digital high-voltage meter for detecting a load to source voltage and a neutral position of a utility voltage regulator
TWI374602B (en) Power supply control circuit and method for sensing voltage in the power supply control circuit
US20190278346A1 (en) Controlling and/or monitoring cathodic protection rectifiers
CN213457334U (en) DC stabilized power supply calibration test tool and calibration system
CN102445656B (en) Detection device for electronic release of low-voltage apparatus, and control method
JP3553481B2 (en) measuring device
CN205720624U (en) A kind of spark gap on-line computing model calibration equipment
CN113092973A (en) Insulation monitoring device and method of direct current IT system
CN101452025B (en) Suspension joint type high voltage and high current synchronization measuring method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant