CN220399628U - Device for checking field device - Google Patents

Abstract

The utility model discloses a device for verifying field equipment, which comprises a signal processing module, an accumulated electric energy comparison module, a main control module, a filtering module, a high-speed data acquisition module, an electric energy metering module, a service adaptation module and an input/output module, wherein the filtering module, the high-speed data acquisition module, the electric energy metering module, the service adaptation module and the input/output module are connected with the main control module; the signal processing module is connected with the filtering module; the high-speed data acquisition module acquires a first digital acquisition result and a second digital acquisition result and sends the second digital acquisition result to the accumulated electric energy register; the first digital acquisition result and the second digital acquisition result are sent to an electric energy metering module through an accumulated electric energy register; the electric energy metering module determines the total accumulated electric energy increment of the electric energy metering module; and the accumulated electric energy comparison module is used for generating an accumulated electric energy update signal through the main control module when the accumulated electric energy increment reaches a preset electric energy threshold value, updating the accumulated electric energy value and sending the accumulated electric energy value to the main control module.

Description

Device for checking field device

Technical Field

The utility model relates to the technical field of metering detection, in particular to a device for checking field equipment.

Background

The electric automobile fills electric pile as an emerging electric energy metering device and relates to the trade settlement of electric energy. The country has paid great attention to the accuracy and reliability of electric energy metering, electric automobile charging piles are brought into a forced verification catalogue, and corresponding verification rules are issued. The national institutes of quality issues JJG 1148-2022 "electric automobile off-board charger verification procedure" and JJG 1149-2022 "electric automobile alternating current charging pile verification procedure". In both of these procedures, a method of calibrating a charging stake using a charging stake field tester and a resistive load is specified. However, this method requires a preset load point, i.e., the charging voltage, current, and power are all constant conditions. If the method is adopted, a person is required to carry a high-power load (usually more than 100 kg) to a charging site, and the defects of long verification time (1-4 h consumed by a single machine), high consumption of electric energy (20-40 kWh consumed by a single machine) and the like exist, so that the method is difficult to apply to mass on-site metering detection or calibration. In order to solve the problem of the on-site verification operation and maintenance efficiency of the charging facility, an electric automobile can be used as a charging load for metering performance verification, but the existing on-site verification instrument of the charging facility is mainly used for metering electric energy of constant load, and under a wide dynamic range, a jump risk exists, so that accumulated electric energy is misaligned; the accumulated electric energy refreshing speed is low, the change of the output power of the charger cannot be tracked rapidly, and the accumulated electric energy misalignment cannot meet the accurate verification requirement when the charging facility is in dynamic load. In addition, the traditional charging pile field detection device is only suitable for charging facility calibration detection, and has single function; the temperature self-adaptive compensation function is not provided, and the metering precision is required to be improved.

Therefore, development of a device for verifying field devices is needed, so that the detection operation and maintenance efficiency of the charging pile is improved, and technical support is provided for development and construction of the charging pile and quality supervision.

Disclosure of Invention

The technical scheme of the utility model provides a device for verifying field equipment, which aims to solve the problem of how to verify the field equipment.

In order to solve the problems, the utility model provides a device for verifying field equipment, which comprises a signal processing module, an accumulated electric energy comparison module, a main control module, a filtering module, a high-speed data acquisition module, an electric energy metering module, a service adaptation module and an input/output module, wherein the filtering module, the high-speed data acquisition module, the electric energy metering module, the service adaptation module and the input/output module are connected with the main control module; the signal processing module is connected with the filtering module; the accumulated electric energy comparison module is connected with the electric energy metering module;

the service adaptation module is used for activating a test interface corresponding to the field device;

the input/output module is used for connecting the field device and a load;

the signal processing module comprises a resistor voltage division network and a current shunt, the resistor voltage division network is used for converting a large voltage signal output by the field device into a small voltage signal, and the current shunt is connected in parallel to convert the large current signal output by the field device into the small voltage signal;

the filtering module is used for removing interference in the converted small voltage signal and converting the waveform filtering of the small voltage signal into a standard waveform;

the high-speed data acquisition module comprises a current-to-voltage conversion sub-module, a first signal conditioning sub-module, a second signal conditioning sub-module, a first high-speed ADC sampling sub-module, a second high-speed ADC sampling sub-module and an accumulated electric energy register, and is used for acquiring the current signals and the voltage signals output by the filtering module at high speed for a plurality of times in a sampling period; the current-to-voltage conversion sub-module is used for converting the collected current signals into first small voltage signals, the first small voltage signals are digitally sampled through the first high-speed ADC sampling sub-module after passing through the first signal conditioning sub-module, a first digital collection result is obtained, and the first digital collection result is sent to the accumulated electric energy register; the collected voltage signals are converted into second small voltage signals through the voltage conversion sub-module, the second small voltage signals are digitally sampled through the second high-speed ADC sampling sub-module after passing through the second signal conditioning sub-module, a second digital collection result is obtained, and the second digital collection result is sent to the accumulated electric energy register; transmitting the first digital acquisition result and the second digital acquisition result to the electric energy metering module through the accumulated electric energy register;

the electric energy metering module comprises a 24-bit DSP digital signal processing circuit and is used for receiving a plurality of first digital acquisition results and a plurality of second digital acquisition results in a sampling period through the DSP digital signal processing circuit; determining a total accumulated electric energy increment of the electric energy metering module by utilizing a plurality of first digital acquisition results and a plurality of second digital acquisition results based on preset updating time;

the accumulated electric energy comparison module is used for comparing whether the total accumulated electric energy increment reaches a preset electric energy threshold value, and when the accumulated electric energy increment reaches the preset electric energy threshold value, the accumulated electric energy update signal is generated through the main control module, the accumulated electric energy value is updated, and the accumulated electric energy value is sent to the main control module.

Preferably, the method further comprises: the temperature and humidity monitoring and compensating module is connected with the electric energy metering module and is used for measuring the temperature and humidity of the environment where the field device is located, acquiring temperature signals and humidity signals and sending the temperature signals and the humidity signals to the electric energy metering module;

and the electric energy metering module confirms a temperature and humidity compensation correction coefficient based on the received temperature signal and humidity signal, and adjusts the first digital acquisition result and the second digital acquisition result based on the temperature and humidity compensation correction coefficient.

Preferably, the method further comprises: and the clock checking function module is connected with the control module and is used for checking time of the field device based on standard time.

Preferably, the accumulated power register includes an integrator and a differential current sensor, and the integrator is directly connected to the differential current sensor.

Preferably, the method further comprises: a touch type information interaction module; the touch information interaction module acquires field picture information through the set image recognition acquisition sub-module, and performs information interaction through the set instruction transmission sub-module.

Preferably, the service adaptation module comprises a charging pile test interface, a current conversion sub-module, a multiplexing voltage conversion sub-module, a mounting type electric energy meter and other service adaptation test interfaces, wherein a current signal output by a charging pile is input to the current conversion sub-module through the charging pile test interface, and a voltage signal is input to the multiplexing voltage conversion sub-module through the charging pile test interface;

the multiplexing voltage conversion sub-module multiplexes and measures voltage signals of the installed electric energy meter, voltage and current of the installed electric energy meter are measured through the configured voltage clamp and current clamp respectively, and measurement signals of the voltage clamp are input to the multiplexing voltage conversion sub-module through the service adaptation test interface and then transmitted to the high-speed data acquisition module for voltage signal sampling; the measuring signal of the current clamp is converted into a small current signal, and the small current signal is input to the small current measuring module through the service adaptation testing interface and then transmitted to the high-speed data acquisition module for sampling the small current signal.

Preferably, the device is characterized in that it further comprises:

the R4 resistor simulation module is characterized in that the resistor adjustment range of the R4 resistor simulation module is 420 omega-6800 omega, and the adjustment step is 1 omega; the contacts of the R4 resistor simulation module are provided with on-off switches;

the low-voltage auxiliary power supply electric signal measuring circuit has the applicable voltage of 0V to 30V, the applicable current of 0A to 10A and the applicable load of not more than 240W;

the voltage access range of the insulation resistance analog circuit is 0V to 800V, the resistance adjustment range is 10k omega to 1M omega, and the adjustment step is 1k omega;

a battery simulator having an output voltage of 100V to 1500V;

the working state display is used for displaying the working states of the interfaces, the contacts and the resistor gear.

Preferably, the filtering module is an RC passive bandpass filtering module.

Preferably, the parallel current shunt in the signal processing module is a wide-range high-precision shunt.

The technical scheme of the utility model provides a device for checking field equipment, solves the problems that the field checking operation and maintenance efficiency of a charging facility needs to be improved and the equipment is inconvenient to carry, and effectively improves the metering precision of the charging pile detection equipment.

Drawings

Exemplary embodiments of the present utility model may be more completely understood in consideration of the following drawings:

FIG. 1 is a schematic illustration of an apparatus for verifying a field device in accordance with a preferred embodiment of the present utility model;

fig. 2 is a schematic diagram of an external structure of a portable multifunctional charging pile checking operation and maintenance device according to a preferred embodiment of the present utility model;

FIG. 3 is a schematic diagram of the logic structure of a high-speed data acquisition module according to a preferred embodiment of the present utility model;

FIG. 4 is a schematic diagram of a logic structure of a temperature and humidity monitoring and compensation module according to a preferred embodiment of the present utility model;

fig. 5 is a schematic logic structure diagram of a service adaptation module according to a preferred embodiment of the present utility model;

fig. 6 is a functional structural diagram of a checking operation and maintenance device for a charging pile according to a preferred embodiment of the present utility model.

Detailed Description

The exemplary embodiments of the present utility model will now be described with reference to the accompanying drawings, however, the present utility model may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present utility model and fully convey the scope of the utility model to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, like elements/components are referred to by like reference numerals.

Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Fig. 1 is a schematic diagram of an apparatus for verifying a field device according to a preferred embodiment of the present utility model. The utility model solves the problems that the field checking operation and maintenance efficiency of the charging facility needs to be improved and the equipment is inconvenient to carry, and effectively improves the metering precision of the charging pile detection equipment. The utility model provides a device shell for verifying field equipment, which is a pull rod box type shell, wherein an internal module of the device shell mainly comprises a main control module, a signal processing module, a filtering module, a high-speed data acquisition module, an electric energy metering module, an accumulated electric energy comparison module, a temperature and humidity monitoring and compensating module, a service adaptation module, an input and output interface module and the like. Firstly, a signal processing module converts an input large-voltage and current signal into a small-signal voltage, filtering operation is carried out, then after digital sampling is carried out by using a high-speed data acquisition module, a main control module calculates to obtain a rapidly refreshed accumulated electric energy value, so that the ms-level accumulated electric energy refresh speed is realized, and the accumulated electric energy error is controlled below 0.1%.

As shown in fig. 1, the utility model provides a device for checking field devices, which comprises a signal processing module, an accumulated electric energy comparison module, a main control module, a filtering module, a high-speed data acquisition module, an electric energy metering module, a service adaptation module and an input/output module, wherein the filtering module, the high-speed data acquisition module, the electric energy metering module, the service adaptation module and the input/output module are connected with the main control module; the signal processing module is connected with the filtering module; the accumulated electric energy comparison module is connected with the electric energy metering module;

the main control module is respectively connected with the filtering module, the high-speed data acquisition module, the electric energy metering module, the service adaptation module, the input/output module and the like, and is mainly used for controlling other modules of the charging facility on-site operation and maintenance verification device, so that the functions of dynamic load precise metering, charging facility verification calibration control, detection interface adaptation, detection state switching and the like are realized.

The service adaptation module is used for activating a test interface corresponding to the field device;

the input/output module is used for connecting the field device and the load;

the input/output interface module mainly comprises an input interface module and an output interface module. The input interface module is mainly used for connecting the device with the device to be tested; the output interface module is mainly used for connecting the device with a load (or an electric automobile).

The signal processing module comprises a resistor voltage division network and a current shunt, the resistor voltage division network is used for converting a large voltage signal output by the field device into a small voltage signal, and the current shunt is connected in parallel to convert the large current signal output by the field device into the small voltage signal; preferably, the parallel current shunt in the signal processing module is a wide-range high-precision shunt.

The signal processing module mainly comprises a resistor voltage dividing network and a current divider, and is used for respectively converting the output large voltage and the large current of the charger into small signal voltages. At the voltage signal input end, the sampling resistor voltage dividing network converts the input large voltage signal into a small voltage input signal acceptable by the on-site verification operation and maintenance device. And a current shunt is connected in parallel at the current signal input end to convert a current input signal into a small voltage input signal. Preferably, the parallel current shunt is a wide-range high-precision shunt, and can convert a large current signal into a small voltage signal which is low enough to effectively reduce power loss.

The filtering module is used for removing interference in the converted small voltage signal and converting the waveform filtering of the small voltage signal into a standard waveform; preferably, the filtering module is an RC passive bandpass filtering module.

The filtering module is an RC passive band-pass filtering module and is mainly used for filtering influence factors such as harmonic interference and the like and filtering a voltage waveform into a standard waveform.

The high-speed data acquisition module comprises a current-to-voltage conversion sub-module, a first signal conditioning sub-module, a second signal conditioning sub-module, a first high-speed ADC sampling sub-module, a second high-speed ADC sampling sub-module and an accumulated electric energy register, and is used for acquiring the current signals and the voltage signals output by the filtering module at high speed for a plurality of times in a sampling period; the method comprises the steps that an acquired current signal is converted into a first small voltage signal through a current-to-voltage conversion sub-module, the first small voltage signal is digitally sampled through a first high-speed ADC sampling sub-module after passing through a first signal conditioning sub-module, a first digital acquisition result is obtained, and the first digital acquisition result is sent to an accumulated electric energy register; the collected voltage signals are converted into second small voltage signals through a voltage conversion sub-module, the second small voltage signals are digitally sampled through a second high-speed ADC sampling sub-module after passing through a second signal conditioning sub-module, a second digital collection result is obtained, and the second digital collection result is sent to an accumulated electric energy register; the first digital acquisition result and the second digital acquisition result are sent to an electric energy metering module through an accumulated electric energy register;

the high-speed data acquisition module mainly comprises an I/V conversion sub-module (current/voltage conversion sub-module), a V/V conversion sub-module (voltage conversion sub-module), a signal adjustment sub-module, a high-speed ADC sampling sub-module and an accumulated electric energy register. The signal conditioning sub-module mainly comprises a high-order chopper stabilized Delta-sigma modulator and a linear phase FIR digital filter.

The high-speed data acquisition module is a parallel comparison type high-speed ADC sampling module, all paths of data conversion are completed simultaneously, and the conversion time mainly depends on the switching speed of a comparator and the transmission delay of an encoder.

The electric energy metering module comprises a 24-bit DSP digital signal processing circuit and is used for receiving a plurality of first digital acquisition results and a plurality of second digital acquisition results in a sampling period through the DSP digital signal processing circuit; determining the total accumulated electric energy increment of the electric energy metering module by utilizing a plurality of first digital acquisition results and a plurality of second digital acquisition results based on preset updating time;

the electric energy metering module mainly comprises a 24-bit DSP digital signal processing circuit. The 24-bit DSP digital signal processing unit is mainly used for obtaining electric energy parameters such as active power, reactive power, apparent power, voltage and current effective values, power factors, frequency and the like. The device integrates 7 paths of second-order sigma-dematlA/D, wherein 3 paths are used for three-phase voltage sampling, 3 paths are used for current sampling, and 1 path can be used for sampling zero line current or other electricity larceny prevention parameters and outputting sampling data effective values. The reference voltage circuit and all digital signal processing circuits for measuring various electric parameters including fundamental wave, harmonic wave and full wave are integrated, so that the active power, reactive power, apparent power, functional quantity and reactive energy of each phase and each phase including the fundamental wave, the harmonic wave and the full wave can be measured, and parameters such as frequency, effective values of currents and voltages of each phase, power factors, phase angles and the like can be measured.

The accumulated electric energy comparison module is used for comparing whether the total accumulated electric energy increment reaches a preset electric energy threshold value, generating an accumulated electric energy update signal through the main control module when the accumulated electric energy increment reaches the preset electric energy threshold value, updating the accumulated electric energy value and sending the accumulated electric energy value to the main control module.

The accumulated power register mainly comprises an integrator and a differential current sensor, and the data refresh rate of the accumulated power register is improved by directly connecting an internal integrator interface of the accumulated power register with the differential current sensor.

The accumulated electric energy comparison module is used for comparing the total accumulated electric energy with a preset electric energy threshold value, and the main control module is used for generating an accumulated electric energy update signal to support the rapid refreshing of the value of the accumulated electric energy.

Preferably, the apparatus further comprises: the temperature and humidity monitoring and compensating module is connected with the electric energy metering module and is used for measuring the temperature and humidity of the environment where the field equipment is located, acquiring temperature signals and humidity signals and sending the temperature signals and the humidity signals to the electric energy metering module;

the electric energy metering module confirms a temperature and humidity compensation correction coefficient based on the received temperature signal and humidity signal, and adjusts the first digital acquisition result and the second digital acquisition result based on the temperature and humidity compensation correction coefficient.

The temperature and humidity monitoring and compensating module mainly comprises a temperature and humidity monitoring sub-module, a temperature and humidity signal processing module and an error compensating sub-module. The temperature and humidity monitoring submodule is used for measuring the temperature and humidity of the field environment in real time, the temperature and humidity monitoring submodule is used for converting the temperature and humidity monitoring submodule into a standard digital signal and transmitting the standard digital signal to the main control module in real time, the main control module is used for giving a temperature compensation correction digital quantity according to a preset temperature and humidity coefficient, and the electric parameter measurement result is compensated and adjusted to improve the electric energy measurement accuracy.

Preferably, the apparatus further comprises: and the clock checking function module is connected with the control module and is used for checking the time of the field device based on standard time.

Preferably, the accumulated power register of the device comprises an integrator and a differential current sensor, the integrator being directly connected to the differential current sensor.

Preferably, the apparatus further comprises: a touch type information interaction module; the touch information interaction module acquires the field picture information through the set image recognition acquisition sub-module, and carries out information interaction through the set instruction transmission sub-module.

Preferably, the service adaptation module of the device comprises a charging pile test interface, a current conversion sub-module, a multiplexing voltage conversion sub-module, a mounting type electric energy meter and other service adaptation test interfaces, a current signal output by the charging pile is input to the current conversion sub-module through the charging pile test interface, and a voltage signal is input to the multiplexing voltage conversion sub-module through the charging pile test interface;

the multiplexing voltage conversion sub-module multiplexes and measures voltage signals of the installed electric energy meter, the voltage and the current of the installed electric energy meter are measured through the configured voltage clamp and the current clamp respectively, and the measurement signals of the voltage clamp are input to the multiplexing voltage conversion sub-module through the service adaptation test interface and then transmitted to the high-speed data acquisition module for voltage signal sampling; the measuring signal of the current clamp is converted into a small current signal, and the small current signal is input to the small current measuring module through the service adaptation testing interface and then transmitted to the high-speed data acquisition module for sampling the small current signal.

The service adaptation module comprises a charging pile test interface, a current conversion sub-module and a multiplexing voltage conversion sub-module, wherein a metering equipment test interface such as an electric energy meter is added on the basis of a traditional charging facility detection interface, so that the service adaptation module has the functions of adaptation calibration, inspection and operation and maintenance of various field devices such as an electric automobile charging facility and an electric energy meter.

For the on-site detection/calibration of the charging pile, a current signal output by the charging pile is input to the current conversion sub-module through the charging pile test interface, and a voltage signal is input to the multiplexing voltage conversion sub-module through the charging pile test interface.

The utility model can be used for on-site detection/calibration of the installed electric energy meter, the scheme is additionally provided with the voltage clamp and the current clamp for on-site verification of the installed electric energy meter, the voltage and the current of the installed electric energy meter are measured, the measurement signals of the voltage clamp are input to the multiplexing voltage conversion sub-module through the service adaptation test interface and then transmitted to the high-speed data acquisition module, and the voltage signal is sampled; the measuring signal of the current clamp is converted into a small current signal, and the small current signal is input to the small current measuring module through the service adaptation testing interface and then transmitted to the high-speed data acquisition module for sampling the small current signal.

Preferably, the apparatus further comprises:

the R4 resistor simulation module is provided with a resistor adjustment range of 420 omega-6800 omega and an adjustment step of 1 omega; the contacts of the R4 resistor simulation module are provided with on-off switches;

the low-voltage auxiliary power supply electric signal measuring circuit has the applicable voltage of 0V to 30V, the applicable current of 0A to 10A and the applicable load of not more than 240W;

the voltage access range of the insulation resistance analog circuit is 0V to 800V, the resistance adjustment range is 10k omega to 1M omega, and the adjustment step is 1k omega;

a battery simulator, the output voltage of the battery simulator being 100V to 1500V;

the working state display is used for displaying the working states of the interfaces, the contacts and the resistor gear.

In order to enable the charging pile checking operation and maintenance device to have the functions of adapting, calibrating, checking, operating and maintenance of various field devices such as an electric automobile charging facility, an electric energy meter and the like. The utility model has the field operation and maintenance function of the charging pile (machine) besides the built-in standard electric energy measurement function, the field calibration function of the installed electric energy meter, and the specific configuration of the function modules comprises:

an R4 resistor simulation module is arranged in the resistor, the resistor adjustment range is 420-6800 omega, and the resistor is stepped by 1 omega. Each contact is provided with an on-off switch, so that the on-off state simulation of the contact can be realized.

And (3) testing a low-voltage auxiliary power supply: the low-voltage auxiliary power supply electric signal measuring circuit (voltage 0-30V, current 0-10A) and the test load (240W) are arranged in the test device, so that the test project of the low-voltage auxiliary power supply can be completed.

Insulation resistance analog circuit: the simulation of the insulation state of the charging machine can be completed, the voltage access range is 0V-800V, the resistance adjustment range is 10k omega-1M omega, and the stepping is 1k omega, so that the simulation of the insulation fault of the positive electrode and the negative electrode of the charging pile can be simulated.

Battery simulator: the output voltage is 100V-1000V, and BMS simulation of the electric automobile is realized.

The working state is displayed: the working states of each interface, each contact and the resistance gear can be displayed.

The device for verifying the field device is provided with a high-speed and high-reliability high-speed data acquisition module, so that the data sampling rate is increased to a ms-level accumulated electric energy refreshing speed, and the accumulated electric energy error is controlled below 0.1%; the temperature and humidity calibration compensation function of the standard device is added, and the metering precision of the calibration operation and maintenance device of the charging facility is effectively improved; the device has the functions of adaptive calibration, inspection and operation and maintenance of various field devices such as an electric automobile charging facility and an electric energy meter, and the universality of the device is improved.

Fig. 2 is an external structure of the portable multifunctional charging pile checking operation and maintenance device. The portable multifunctional charging pile checking operation and maintenance device is matched with a portable pull rod instrument box, has high anti-seismic and electric protection levels and is very convenient to carry to the site.

Fig. 3 is a logic structure of the high-speed data acquisition module. The high-speed data acquisition module mainly comprises an I/V conversion sub-module (current/voltage conversion sub-module), a V/V conversion sub-module (voltage conversion sub-module), a signal adjustment sub-module, a high-speed ADC sampling sub-module and an accumulated electric energy register. The signal conditioning sub-module mainly comprises a high-order chopper stabilized Delta-sigma modulator and a linear phase FIR digital filter. The high-speed data acquisition module is a parallel comparison type high-speed ADC sampling module, all paths of data conversion are completed simultaneously, and the conversion time mainly depends on the switching speed of the comparator and the transmission delay of the encoder.

The accumulated power register mainly comprises an integrator and a differential current sensor, and the data refresh rate of the accumulated power register is improved by directly connecting an internal integrator interface of the accumulated power register with the differential current sensor.

Fig. 4 is a temperature and humidity monitoring and compensating module. The temperature and humidity monitoring and compensating module mainly comprises a temperature and humidity monitoring sub-module, a temperature and humidity signal processing module and an error compensating sub-module. The temperature and humidity monitoring submodule is used for measuring the temperature and humidity of the field environment in real time, the temperature and humidity monitoring submodule is used for converting the temperature and humidity monitoring submodule into a standard digital signal and transmitting the standard digital signal to the main control module in real time, the main control module is used for giving a temperature compensation correction digital quantity according to a preset temperature and humidity coefficient, and the electric parameter measurement result is compensated and adjusted to improve the electric energy measurement accuracy.

Fig. 5 service adaptation module logic structure. The service adaptation module mainly comprises a charging pile test interface, a current conversion sub-module, a multiplexing voltage conversion sub-module and a service adaptation test interface, wherein a metering equipment test interface such as an electric energy meter is added on the basis of a traditional charging facility detection interface, so that the service adaptation module has the functions of electric automobile charging facilities, various field equipment adaptation calibration check and operation and maintenance such as the electric energy meter, and a logic structure is shown in figure 5.

The charging pile checking operation and maintenance device of the figure 6 has the functional structure that 1 is a direct current charging socket, 2 is a special voltage calibration interface, 3 is a direct current charging socket, 4 is a multifunctional interface, 5 is a communication interface, 6 is a GPS antenna, 7 is an AC220V power interface, 8 is a built-in high-capacity lithium battery, 9 is an auxiliary test point, and 10 is a liquid crystal touch sampling screen.

In order to enable the charging pile checking operation and maintenance device to have the functions of adapting, calibrating, checking, operating and maintenance of various field devices such as an electric automobile charging facility, an electric energy meter and the like. The utility model has the field operation and maintenance function of the charging pile (machine) besides the built-in standard electric energy measurement function, the field calibration function of the installed electric energy meter, and the specific configuration of the function modules comprises:

an R4 resistor simulation module is arranged in the resistor, the resistor adjustment range is 420-6800 omega, and the resistor is stepped by 1 omega. Each contact is provided with an on-off switch, so that the on-off state simulation of the contact can be realized.

And (3) testing a low-voltage auxiliary power supply: the low-voltage auxiliary power supply electric signal measuring circuit (voltage 0-30V, current 0-10A) and the test load (240W) are arranged in the test device, so that the test project of the low-voltage auxiliary power supply can be completed.

Insulation resistance analog circuit: the simulation of the insulation state of the charging machine can be completed, the voltage access range is 0V-800V, the resistance adjustment range is 10k omega-1M omega, and the stepping is 1k omega, so that the simulation of the insulation fault of the positive electrode and the negative electrode of the charging pile can be simulated.

Battery simulator: the output voltage is 100V-1000V, and BMS simulation of the electric automobile is realized.

The working state is displayed: the working states of each interface, each contact and the resistance gear can be displayed.

When the utility model is applied to the field calibration of the charging pile, the charging pile calibration operation and maintenance device is regarded as equipment with higher accuracy level than the calibrated charging pile and auxiliary function, the charging pile calibration operation and maintenance device is connected into a current loop and a voltage loop which are the same as the calibrated charging pile through a special test terminal, a current signal is obtained from a current wiring terminal of the calibrated charging pile, a voltage signal is obtained from a voltage wiring terminal of the calibrated charging pile, and the situation that the current loop is opened and the voltage loop is short-circuited in the process of the calibration is ensured. After the charging pile checking operation and maintenance device is thermally stable and in a relatively stable load state, the checked charging pile and the charging pile checking operation and maintenance device synchronously operate for a long enough time, so that the ratio (%) of the rated power value represented by the last character of the display of the checked charging pile to the accumulated E' is not more than 1/10 of the rating index of the checked charging pile. And in the same time interval, comparing the electric energy of the charging pile verification operation and maintenance device with the electric energy increment displayed by the charging pile to determine a charging quantity display error.

The utility model can be applied to the field detection/calibration of the installed electric energy meter. When the method is applied to field detection/calibration of the installed electric energy meter, the scheme needs to be additionally provided with a voltage clamp and a current clamp for field calibration of the installed electric energy meter for measuring the voltage and the current of the installed electric energy meter, and measurement signals of the voltage clamp are transmitted to a high-speed data acquisition module through a multiplexing voltage conversion sub-module to sample voltage signals; the measuring signal of the current clamp is converted into a small current signal, the small current signal is transmitted to the high-speed data acquisition module through the small current measuring module by the service adaptation testing interface, the small current signal is sampled, and finally, the small current signal is processed through the high-speed ADC sampling and the main control module, so that the field verification of the installed electric energy meter is realized.

It will be appreciated by those skilled in the art that embodiments of the present utility model may be provided as a method, system, or computer program product. Accordingly, the present utility model may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present utility model may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the utility model can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.

The present utility model is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the utility model. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present utility model have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

The utility model has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed utility model are equally possible within the scope of the utility model, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (9)

1. The device comprises a signal processing module, an accumulated electric energy comparison module, a main control module, a filtering module, a high-speed data acquisition module, an electric energy metering module, a service adaptation module and an input/output module, wherein the filtering module, the high-speed data acquisition module, the electric energy metering module, the service adaptation module and the input/output module are connected with the main control module; the signal processing module is connected with the filtering module; the accumulated electric energy comparison module is connected with the electric energy metering module;

the service adaptation module is used for activating a test interface corresponding to the field device;

the input/output module is used for connecting the field device and a load;

the signal processing module comprises a resistor voltage division network and a current shunt, the resistor voltage division network is used for converting a large voltage signal output by the field device into a small voltage signal, and the current shunt is connected in parallel to convert the large current signal output by the field device into the small voltage signal;

the filtering module is used for removing interference in the converted small voltage signal and converting the waveform filtering of the small voltage signal into a standard waveform;

the high-speed data acquisition module comprises a current-to-voltage conversion sub-module, a first signal conditioning sub-module, a second signal conditioning sub-module, a first high-speed ADC sampling sub-module, a second high-speed ADC sampling sub-module and an accumulated electric energy register, and is used for acquiring the current signals and the voltage signals output by the filtering module at high speed for a plurality of times in a sampling period; the current-to-voltage conversion sub-module is used for converting the collected current signals into first small voltage signals, the first small voltage signals are digitally sampled through the first high-speed ADC sampling sub-module after passing through the first signal conditioning sub-module, a first digital collection result is obtained, and the first digital collection result is sent to the accumulated electric energy register; the collected voltage signals are converted into second small voltage signals through the voltage conversion sub-module, the second small voltage signals are digitally sampled through the second high-speed ADC sampling sub-module after passing through the second signal conditioning sub-module, a second digital collection result is obtained, and the second digital collection result is sent to the accumulated electric energy register; transmitting the first digital acquisition result and the second digital acquisition result to the electric energy metering module through the accumulated electric energy register;

the electric energy metering module comprises a 24-bit DSP digital signal processing circuit and is used for receiving a plurality of first digital acquisition results and a plurality of second digital acquisition results in a sampling period through the DSP digital signal processing circuit; determining a total accumulated electric energy increment of the electric energy metering module by utilizing a plurality of first digital acquisition results and a plurality of second digital acquisition results based on preset updating time;

the accumulated electric energy comparison module is used for comparing whether the total accumulated electric energy increment reaches a preset electric energy threshold value, and when the accumulated electric energy increment reaches the preset electric energy threshold value, the accumulated electric energy update signal is generated through the main control module, the accumulated electric energy value is updated, and the accumulated electric energy value is sent to the main control module.

2. The apparatus as recited in claim 1, further comprising: the temperature and humidity monitoring and compensating module is connected with the electric energy metering module and is used for measuring the temperature and humidity of the environment where the field device is located, acquiring temperature signals and humidity signals and sending the temperature signals and the humidity signals to the electric energy metering module;

and the electric energy metering module confirms a temperature and humidity compensation correction coefficient based on the received temperature signal and humidity signal, and adjusts the first digital acquisition result and the second digital acquisition result based on the temperature and humidity compensation correction coefficient.

3. The apparatus as recited in claim 1, further comprising: and the clock hand checking function module is connected with the control module and is used for checking time of the field device based on standard time.

4. The apparatus of claim 1, wherein the accumulated power register comprises an integrator and a differential current sensor, the integrator being directly connected to the differential current sensor.

5. The apparatus as recited in claim 1, further comprising: a touch type information interaction module; the touch information interaction module acquires field picture information through the set image recognition acquisition sub-module, and performs information interaction through the set instruction transmission sub-module.

6. The apparatus of claim 1, wherein the service adaptation module comprises a charging pile test interface, a current conversion sub-module, and a multiplexing voltage conversion sub-module, a current signal output by a charging pile is input to the current conversion sub-module through the charging pile test interface, and a voltage signal is input to the multiplexing voltage conversion sub-module through the charging pile test interface;

the multiplexing voltage conversion sub-module multiplexes and measures voltage signals of the installed electric energy meter, the voltage and the current of the installed electric energy meter are measured through the configured voltage clamp and the current clamp respectively, and the measurement signals of the voltage clamp are transmitted to the high-speed data acquisition module through the multiplexing voltage conversion sub-module to sample the voltage signals; the measuring signal of the current clamp is converted into a small current signal, and the small current signal is transmitted to the high-speed data acquisition module through the small current measuring module to sample the small current signal.

7. The apparatus of claim 1, wherein the apparatus further comprises:

the R4 resistor simulation module is characterized in that the resistor adjustment range of the R4 resistor simulation module is 420 omega-6800 omega, and the adjustment step is 1 omega; the contacts of the R4 resistor simulation module are provided with on-off switches;

the low-voltage auxiliary power supply electric signal measuring circuit has the applicable voltage of 0V to 30V, the applicable current of 0A to 10A and the applicable load of not more than 240W;

the voltage access range of the insulation resistance analog circuit is 0V to 800V, the resistance adjustment range is 10k omega to 1M omega, and the adjustment step is 1k omega;

a battery simulator having an output voltage of 100V to 1500V;

the working state display is used for displaying the working states of the interfaces, the contacts and the resistor gear.

8. The apparatus of claim 1, wherein the filtering module is an RC passive bandpass filtering module.

9. The device according to claim 1, wherein the parallel current shunt in the signal processing module is a wide-range high-precision shunt.