CN211375030U

CN211375030U - Instrument calibration circuit applied to power plant control room

Info

Publication number: CN211375030U
Application number: CN201921624030.4U
Authority: CN
Inventors: 王新; 梁思光; 全胜; 任林保; 任哲锋; 刘波
Original assignee: China Nuclear Industry Maintenance Co Ltd
Current assignee: China Nuclear Industry Maintenance Co Ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-08-28
Anticipated expiration: 2029-09-26

Abstract

The utility model provides a be applied to instrument check-up circuit of power plant's control room, instrument check-up circuit includes: the device comprises a current reference module, a power amplification module, a current verification module, a current display module and an indication verification module; the power amplification module is used for carrying out power amplification on the feedback current signal output by the instrument to be detected to obtain a detection current signal; the current checking module detects a current difference value between the detection current signal and the target current signal to obtain a current drift amount of the instrument to be detected; the current display module detects the current value of the detection current signal to obtain a target digital display value; the indication checking module obtains a current display error of the instrument to be detected according to a difference value between a current digital value displayed by the instrument to be detected in real time and a target digital display value; according to the embodiment, the high-precision and all-dimensional calibration function of the instrument to be detected is realized according to the current drift amount and the current display error of the instrument to be detected, the instrument calibration efficiency of the instrument to be detected is improved, and the monitoring safety and the monitoring accuracy of the instrument to be detected are guaranteed.

Description

Instrument calibration circuit applied to power plant control room

Technical Field

The application belongs to the technical field of electronic circuits, and particularly relates to an instrument calibration circuit applied to a control room of a power plant.

Background

With the continuous development of power systems, electric energy becomes a strategic resource for social development, and the stability of the electric energy has an extremely important significance for improving the production and living standards of people; people output corresponding power supply electric energy through a power plant to guarantee the continuous power utilization safety of people, and the power plant plays an important part in a power system; and the power consumption in the industrial production process is increasingly large, the number of the power plants is increasingly large, the high-power electric energy output by the power plants can drive the electronic equipment to realize the corresponding circuit function, and the protection of the power supply safety of the power plants has extremely important practical value for the modern society.

Because the existing power plant adopts a digital power generation control mode, and the power equipment in the power plant realizes automatic operation, instrument control equipment in the power plant has extremely important significance for the automatic operation of the power plant, and when the power plant supplies power, the fault state of the power equipment in the power plant can be monitored through the instrument control equipment so as to ensure the stability and the safety of electric energy in the power plant; therefore, the instrument control equipment plays an essential role in maintaining the power generation safety performance of the power plant; if the instrument control equipment is in an unsafe state, the safety of electric energy in the power plant is low, and the electric energy is in an uncontrollable state; the technician is required to periodically troubleshoot and verify the instrumentation.

However, in the conventional technology, an observation method, a manual striking method and the like are generally adopted for calibrating the instrument control equipment in the power plant, and these methods need to manually calibrate the instrument by manpower, which not only wastes time and labor, but also greatly complicate the calibration steps of the instrument control equipment, generate a great human factor error, have low calibration precision, generate a great misoperation risk and a physical damage risk for the power plant, cannot timely prevent and correct the failure state of the instrument control equipment, and are difficult to generally apply.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the application provides an instrument calibration circuit applied to a control room of a power plant, and aims to solve the problems that the traditional technical scheme has low calibration precision on instrument control equipment in the power plant, needs to consume large manpower and time, has low calibration efficiency, is difficult to timely detect and prevent faults and risks of the instrument control equipment, and damages the power supply safety.

The first aspect of the embodiment of the application provides an instrument check circuit for power plant's control room, is connected with the instrument to be detected, instrument check circuit includes:

a current reference module configured to output a target current signal according to a control signal;

the power amplification module is connected with the instrument to be detected and is configured to receive the feedback current signal output by the instrument to be detected and amplify the power of the feedback current signal to obtain a detection current signal;

the current checking module is connected with the power amplifying module and the current reference module and is configured to judge a current difference value between the detection current signal and the target current signal so as to obtain a current drift amount of the instrument to be detected;

the current display module is connected with the power amplification module and is configured to detect the current value of the detection current signal so as to obtain a target digital display value and display the target digital display value; and

and the indication checking module is connected with the current display module and the instrument to be detected and is configured to obtain a current display error of the instrument to be detected according to a difference value between a current digital value displayed by the instrument to be detected in real time and the target digital display value.

In one embodiment thereof, the current reference module comprises:

the first current reference unit is connected with the current checking module and is configured to output a current zero signal according to a first control signal;

the power amplification module includes:

the first power amplification unit is connected with the instrument to be detected, the current verification module and the current display module, and is configured to receive a zero current signal output by the instrument to be detected in a no-load working mode and amplify the zero current signal to obtain a zero detection signal.

In one embodiment, the first power amplifying unit includes:

the circuit comprises a first comparator, a first resistor, a second resistor and a third resistor;

the positive phase input end of the first comparator is connected with a reference power supply, the negative phase input end of the first comparator and the first end of the first resistor are connected to the instrument to be detected in a common mode, the second end of the first resistor and the first end of the second resistor are connected to the first end of the third resistor in a common mode, and the second end of the second resistor is grounded;

the second end of the third resistor and the output end of the first comparator are connected to the current checking module and the current display module in a sharing mode.

In one embodiment thereof, the current reference module comprises:

the second current reference unit is connected with the current checking module and is configured to output a current range signal according to a second control signal;

the power amplification module includes:

and the second power amplification unit is connected with the instrument to be detected, the current verification module and the current display module, and is configured to receive a load current signal output by the instrument to be detected in a load working mode and amplify the load current signal to obtain a load detection signal.

In one embodiment thereof, the current reference module comprises: the direct current source has a preset current range, wherein the preset current range is 4-20 milliamperes.

In one embodiment, the method further comprises:

and the overcurrent detection module is connected with the power amplification module and is configured to obtain an overcurrent detection signal according to the difference value between the current value of the detection current signal and a preset safe current value.

In one embodiment thereof, the current display module comprises: at least any one of an electric current meter and a multimeter.

In one embodiment, the method further comprises:

and the switch module is connected between the power amplification module and the instrument to be detected, is configured to be switched on or switched off according to a key signal, and outputs the feedback current signal to the power amplification module when the switch module is in a switched-on state.

In one embodiment thereof, the switch module comprises:

a key switch;

the first end of the key switch is connected with the instrument to be detected, and the second end of the key switch is connected with the power amplification module.

In one embodiment, the method further comprises:

and the filtering module is connected with the power amplification module and is configured to filter the detection current signal.

The instrument calibration circuit applied to the power plant control room provides a current reference quantity through the current reference module, then amplifies the current output by the instrument to be detected according to the power amplification module to obtain a detection current signal, and further can accurately obtain the actual current fluctuation condition in the instrument to be detected according to the detection current signal; on one hand, the current drift amount of the instrument to be detected is obtained by detecting the difference value of the reference current amount and the current value of the detected current signal through the current checking module, and whether the current detection error exists in the instrument to be detected can be obtained according to the current drift amount; on the other hand, the current display module detects the detection current signal to obtain a current display result, and whether the current display result is consistent with the current display result of the instrument to be detected, so that whether a current indication error exists in the instrument to be detected is identified; therefore, the current drift amount and the current display error of the to-be-detected instrument are respectively acquired through the current fed back by the to-be-detected instrument, the all-dimensional and automatic calibration function of the to-be-detected instrument is realized, the safety and the electric energy detection stability of the to-be-detected instrument are greatly ensured, manual detection is not required in the calibration process of the to-be-detected instrument, the precision of instrument calibration and the efficiency of calibration are greatly improved, time and labor are saved, the long-term fault detection state of the to-be-detected instrument is prevented, the safety electric energy monitoring requirement of the to-be-detected instrument is met, and the.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of an instrument calibration circuit applied to a control room of a power plant according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another configuration of an instrument calibration circuit applied to a control room of a power plant according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of a first power amplifying unit according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another configuration of an instrument calibration circuit applied to a power plant control room according to an embodiment of the present application;

fig. 5 is a schematic circuit diagram of a second power amplifying unit according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another configuration of an instrument calibration circuit applied to a power plant control room according to an embodiment of the present application;

FIG. 7 is a schematic diagram of another configuration of an instrument calibration circuit applied to a power plant control room according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another embodiment of an instrument calibration circuit applied to a power plant control room;

fig. 9 is a schematic circuit diagram of a filtering module according to an embodiment of the present application;

fig. 10 is a schematic circuit diagram of a current checking module according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of an instrument calibration system applied to a power plant control room according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that the "meter under test" referred to herein includes: various types of detection instruments in a power plant control room, such as a current detection instrument or an overcurrent detection instrument, are used, in the discharging and power supplying processes of a power plant, the power plant control room is not only responsible for real-time control of electric energy production and electric energy transmission, but also can flexibly monitor the electric energy operation process in the power plant, and then the power plant control room is used as a control center of the power plant, has extremely important safety value and also has extremely important actual value for technical personnel; the instrument to be detected is used as monitoring equipment which is arranged in a control room of the power plant, and the electric energy fluctuation condition of the power plant can be controlled in real time through the instrument to be detected, so that the power supply safety of the power plant is guaranteed; therefore, the instrument to be detected has extremely important practical value for the power safety of a power plant.

Referring to fig. 1, in a schematic structural diagram of an instrument calibration circuit 10 applied to a power plant control room provided in an embodiment of the present application, the instrument calibration circuit 10 is connected to an instrument 20 to be tested, and then the instrument calibration circuit 10 can obtain an electric energy fluctuation state of the instrument 20 to be tested in real time, so as to accurately calibrate an electric energy monitoring performance of the instrument 20 to be tested, thereby reducing a standard calibration error of the instrument 20 to be tested, enabling the instrument 20 to be tested to be in a safe and stable operation state for a long time, and preventing a fault operation state of the instrument 20 to be tested; for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:

the meter verification circuit 10 includes: the current checking module comprises a current reference module 101, a power amplification module 102, a current checking module 103, a current display module 104 and an indication checking module 105.

Wherein the current reference module 101 is configured to output the target current signal according to the control signal.

The current reference module 101 has a standard current output function, the current reference module 101 can be driven by a control signal to realize the current output function so as to accelerate the verification operation of the instrument verification circuit 10 on the monitoring performance of the instrument 20 to be detected, and the current reference module 101 has high control response precision and control response performance; the target current signal output by the current reference module 101 is used as a current reference quantity to provide a calibration standard for the calibration process of the instrument 20 to be tested, so that the real-time calibration function of the instrument 20 to be tested is realized, and the calibration precision and efficiency of the instrument 20 to be tested are guaranteed.

Illustratively, the control signal is derived from a control module, wherein the control module is realized by adopting a single chip microcomputer chip in the traditional technology; and the meter verification circuit 10 has high control response performance.

The power amplification module 102 is connected to the meter to be detected 20, and is configured to receive a feedback current signal output by the meter to be detected, and perform power amplification on the feedback current signal to obtain a detection current signal.

The power amplification module 102 has an electric energy amplification function, and current amplification can be performed on the feedback current signal through the power amplification module 102, so that the detection current signal has a larger current amplitude, a higher-precision calibration function can be realized on the instrument to be detected 20, the practical value is higher, and the problem that the instrument calibration precision on the instrument to be detected 20 is lower due to the fact that the current fed back by the instrument to be detected 20 is smaller is solved; illustratively, the power amplification module 102 performs proportional amplification on the current value of the feedback current signal according to a preset current multiple, so as to improve the internal signal conversion precision and efficiency of the power amplification module 102.

Optionally, the power amplification module 102 receives a current feedback signal output by the to-be-detected instrument 20 in a preset operating mode, and performs power amplification on the current feedback signal; when the instrument 20 to be detected is in different working modes, the instrument 20 to be detected outputs a feedback current signal with a specific amplitude, and the electric energy input and output state of the instrument 20 to be detected can be accurately obtained according to the current value fluctuation condition of the feedback current signal; further, a detection current signal is obtained through power amplification of the power amplification module 102, and the electric energy monitoring performance of the instrument 20 to be detected in a preset working mode can be verified in real time according to the detection current signal; furthermore, in the embodiment, the power amplification module 102 can perform accurate and real-time detection on the fine electric energy variation of the instrument 20 to be detected, so that the automatic verification accuracy and efficiency of the instrument 20 to be detected are improved, and the application range is wide.

The current checking module 103 is connected to the power amplifying module 102 and the current reference module 101, and configured to determine a current difference between the detected current signal and the target current signal to obtain a current drift amount of the meter 20 to be detected.

The current reference module 101 outputs a target current signal to the current verification module 103, the power amplification module 102 outputs a detection current signal to the current verification module 103, and the current verification module 103 has current deviation detection and analysis functions; the target current signal represents a theoretical normal current value of the instrument 20 to be detected in the preset working mode, and if the difference value between the current fed back by the instrument 20 to be detected and the theoretical normal current value is larger, it indicates that the amplitude of the internal current drift of the instrument 20 to be detected is larger, and the electric energy monitoring accuracy of the instrument 20 to be detected is lower; therefore, according to the present embodiment, the current drift condition of the meter to be detected 20 can be obtained according to the difference degree between the current value of the detection current signal and the current value of the target current signal; when the current difference between the target current signal and the detection current signal is larger, the larger the current drift amount of the instrument to be detected 20 is, and the lower the monitoring accuracy of the instrument to be detected 20 on the electric energy in the power plant is; therefore, in the embodiment, the current drift amount of the meter to be detected 20 is used as the verification evaluation index of the meter to be detected 20, so that the function of accurately verifying the electric energy monitoring state of the meter to be detected 20 is realized, and the stability and reliability of the electric energy inside the meter to be detected 20 are ensured.

The current display module 104 is connected to the power amplification module 102, and configured to detect a current value of the detected current signal to obtain a target digital display value and display the target digital display value.

The power amplification module 102 outputs the detected current signal to the current display module 104, and then the current display module 104 can realize a current display function, and the real current fluctuation condition of the instrument 20 to be detected can be intuitively obtained in real time through the target digital display value displayed by the current display module 104, so that the omnibearing verification control on the instrument 20 to be detected is facilitated, the verification process of the instrument verification circuit 10 has higher man-machine interaction performance, and better use experience is brought to a user; therefore, in the embodiment, the current fed back by the meter to be detected 20 is digitally displayed, the electric energy monitoring performance of the meter to be detected 20 can be quantitatively evaluated according to the target digital display value, the offline calibration precision and efficiency of the meter calibration circuit 10 on the calibration meter 20 can be improved, and the practical value is higher.

Optionally, the current display module 104 is further connected to the current reference module 101, wherein the current display module 104 detects a current value of the target current signal to obtain and display a first digital value; the current display module 104 in this embodiment can display the current reference quantity output by the current reference module 101, and further perform real-time monitoring on the calibration process of the instrument to be tested 20, so that the target current signal output by the current reference module 101 is always in a safe and stable state, and the current error quantity of the instrument to be tested 20 can be accurately analyzed and judged according to the amplitude of the target current signal, thereby ensuring the safety of the internal electric energy of the instrument calibration circuit 10 and the accuracy and reliability of the instrument calibration process.

The indication checking module 105 is connected to the current display module 104 and the instrument 20 to be detected, and is configured to obtain a current display error of the instrument to be detected according to a difference between the current digital value displayed in real time by the instrument 20 to be detected and the target digital display value.

The instrument 20 to be detected not only has an amplitude monitoring function on the power supply electric energy of the power plant, but also can accurately display the amplitude of the self input and output electric energy in real time through the instrument 20 to be detected, so that the current digital value displayed in real time by the instrument 20 to be detected is the actual current detection characteristic quantity of the instrument 20 to be detected; the target digital display value displayed by the current display module 104 is a detection characteristic quantity of the meter verification circuit 10 for the feedback electric energy of the meter 20 to be detected, and then the target digital display value displayed by the current display module 104 is an actual current detection value of the current display module 104 for the meter 20 to be detected; if the target digital display value displayed by the current display module 104 is completely consistent with the current digital value displayed by the instrument to be detected 20 in the preset working mode, it indicates that the instrument to be detected 20 has no current indication error in the preset working mode; on the contrary, if there is a large error between the target digital display value displayed by the current display module 104 and the current digital value displayed by the instrument 20 to be detected in the preset working mode, it indicates that there is a large error in the current indication function of the instrument 20 to be detected in the preset working mode; therefore, the indication checking module 10 can display the error between the digital display value and the current digital value in real time, and when the error is large, the accuracy of monitoring the electric energy of the instrument 20 to be detected is low, and the practical value is not high; therefore, the current indication of the instrument 20 to be detected in the preset working mode can be accurately obtained according to the current display error for real-time verification, the current verification precision is high, and the application range and precision of the instrument verification circuit 10 are favorably improved.

In the structural schematic of the meter calibration circuit 10 shown in fig. 1, after the feedback current signal fed back and output by the meter to be tested 20 is amplified, the function of accurately monitoring the internal electric energy of the meter to be tested 20 in real time is realized; according to the difference value between the current value of the detection current signal output by the power amplification module 102 and the current reference quantity, the functions of quantifying, accurately judging and identifying the current drift degree of the instrument 20 to be detected are realized, and the monitoring precision and the sensitivity of the internal electric energy of the instrument 20 to be detected are improved; meanwhile, the current indicating state of the instrument 20 to be detected is identified according to the difference between the current display result of the current display module 104 and the current display result of the instrument 20 to be detected, so that whether the instrument 20 to be detected can accurately indicate the current value can be monitored in real time, and the flexibility is high; therefore, in the embodiment, the current drift amount of the meter to be detected 20 and the current display error of the meter to be detected 20 are used as the monitoring performance indexes of the meter to be detected 20 to complete the omnibearing and reliable calibration function of the meter to be detected 20, the calibration precision and efficiency are high, and the control is simple and convenient; therefore, the automatic and omnibearing checking function of the electric energy monitoring state of the instrument to be detected 20 is realized according to the current fed back by the instrument to be detected 20, time and labor are saved, manual checking and judgment are not needed, the functions of preventing and detecting the electric energy fault and the electric energy monitoring error of the instrument to be detected 20 in real time can be realized, and the self-power supply safety and reliability of the instrument to be detected 20 are favorably improved; the problems that the traditional technology is low in calibration precision of instrument control equipment in a power plant, only manual calibration can be relied on, efficiency is low, real-time detection of electric energy faults and monitoring errors of the instrument control equipment cannot be timely detected, the electric energy safety of the power plant is low, and universal application is difficult are effectively solved.

As an alternative implementation, fig. 2 shows another structural schematic of the meter verification circuit 10 provided in this embodiment, and compared with the structural schematic of the meter verification circuit 10 in fig. 1, in fig. 2, the current reference module 101 includes a first current reference unit 1011; the first current reference unit 1011 is connected to the current verification module 103, and the first current reference unit 1011 is configured to output a current zero signal according to a first control signal.

The first current reference unit 1011 has a zero reference function, and a standard zero reference current can be output through the first current reference unit 1011, so that a zero calibration function of the internal electric energy of the instrument 20 to be detected is realized; specifically, when the first current reference unit 1011 is connected to the first control signal, the first current reference unit 1011 can be driven according to the first control signal to realize the current reference output function, so that the instrument calibration circuit 10 can realize the zero calibration function with high precision and high speed for the electric energy monitoring performance of the instrument 20 to be tested in a specific calibration mode.

The power amplification module 102 includes: the first power amplifying unit 1021 is connected with the to-be-detected meter 20, the current checking module 103 and the current display module 104, and is configured to receive a zero current signal output by the to-be-detected meter 20 in a no-load operation mode, and perform power amplification on the zero current signal to obtain a zero detection signal.

In this embodiment, the feedback current signal includes: a zero current signal.

The current checking module 103 detects a current difference between the current zero signal and the zero detection signal to obtain a current drift amount of the meter 20 to be detected in the no-load operation mode.

The current display module 104 detects a current value of the zero point detection signal to obtain a second digital value and displays the second digital value.

The indication checking module 105 obtains a current display error of the instrument 20 to be detected in the no-load working mode according to a difference value between the second digital value and the current digital value displayed by the instrument 20 to be detected in the no-load working mode in real time; in the embodiment, the calibration function of the instrument to be detected 20 is realized through the current drift amount and the current display error of the instrument to be detected 20 in the no-load operation mode, the instrument calibration circuit 10 can monitor the internal electric energy operation condition of the instrument to be detected 20 sensitively and in real time, and the instrument calibration process of the instrument calibration circuit 10 has high controllability and stability.

The first power amplification unit 1021 can perform rapid current amplification processing on the zero-point current signal, the zero-point detection signal can accurately obtain the electric energy input and output amplitude of the instrument 20 to be detected in the no-load operation mode, so as to implement the zero-point calibration function on the instrument 20 to be detected, then, in the no-load operation mode, the zero-point detection signal output by the instrument 20 to be detected has a specific amplitude, and the zero-point detection signal is in one-to-one correspondence with the current zero-point signal, illustratively, the current value of the current zero-point signal is 4 milliamperes, the accurate and efficient calibration function of the instrument 20 to be detected is implemented based on the current zero-point signal, and the calibration precision and controllability of the instrument 20 to be.

As an alternative implementation, fig. 3 shows a schematic circuit structure of a first power amplifying unit 1021 provided in this embodiment, please refer to fig. 3, where the first power amplifying unit 1021 includes: the circuit comprises a first comparator Cmp1, a first resistor R1, a second resistor R2 and a third resistor R3.

The non-inverting input end of the first comparator Cmp1 is connected to a reference power source Vref, wherein the reference power source Vref can provide stable direct current power to the first comparator Cmp1, so that the first power amplification unit 1021 can realize a stable power amplification function, and the internal power safety of the first power amplification unit 1021 is guaranteed; the negative phase input end of the first comparator Cmp1 and the first end of the first resistor R1 are commonly connected to the meter to be tested 20, and then the meter to be tested 20 outputs the feedback current signal to the negative phase input end of the first comparator Cmp1, and the first power amplification unit 1021 and the meter to be tested 20 have high electric energy transmission efficiency.

The second end of the first resistor R1 and the first end of the second resistor R2 are connected to the first end of the third resistor R3, and the second end of the second resistor R2 is connected to the ground GND.

The second terminal of the third resistor R3 and the output terminal of the first comparator Cmp1 are commonly connected to the current verification module 103 and the current display module 104.

Therefore, the first power amplification unit 1021 in this embodiment utilizes the first comparator Cmp1 to implement a proportional amplification function of the zero current signal, so that the accuracy and efficiency of power amplification of electric energy are high, and electric energy loss is avoided; therefore, the running state of the instrument 20 to be detected in the no-load working mode can be verified in real time according to the zero point detection signal output by the output end of the first comparator Cmp1, the internal circuit structure of the first power amplification unit 1021 is simplified, and the physical safety and stability of the instrument 20 to be detected are guaranteed.

As an alternative implementation, fig. 4 shows another structural schematic diagram of the meter calibration circuit 10 provided in this embodiment, please refer to fig. 4, in which the current reference module 101 includes a second current reference unit 1012, and the second current reference unit 1012 is connected to the current calibration module 103 and configured to output a current range signal according to a second control signal.

The second current reference unit 1012 can output a current range signal under the full-range condition, and the full-range calibration of the electric energy of the instrument 20 to be detected is realized based on the current range signal; the current range signal has a specific current value, for example, the current value of the current range signal is 20 milliamperes, the current range signal is used as a current reference, a corresponding instrument calibration standard is set for the instrument 20 to be detected under a full-range condition, and the internal electric energy fluctuation condition of the instrument 20 to be detected is monitored in real time; furthermore, the signal output state of the second current reference unit 1012 can be controlled in real time through the second control signal in this embodiment, and the second current reference unit 1012 has higher control response precision and efficiency, so that the function of checking the monitoring performance of the instrument 20 to be detected in a specific working mode is realized, and the instrument checking requirement of technicians is met.

The power amplification module 102 includes: a second power amplifying unit 1022; the second power amplifying unit 1022 is connected to the to-be-detected meter 20, the current checking module 103, and the current display module 104, and is configured to receive a load current signal output by the to-be-detected meter 20 in the load operating mode, and perform power amplification on the load current signal to obtain a load detection signal.

The current check module 103 detects a current difference between the load detection signal and the current range signal to obtain a current drift amount of the meter 20 to be detected in the load operation mode.

The current display module 104 detects a current value of the detected current signal to obtain and display a third digital value.

The indication checking module 106 obtains a current display error of the instrument 20 to be detected in the load working mode according to a difference value between the third digital value and the current digital value displayed by the instrument 20 to be detected in real time in the load working mode; therefore, in the present embodiment, the current drift amount and the current display error of the meter to be detected 20 in the load operating mode are combined to realize the real-time calibration function of the meter to be detected 20, so as to obtain the actual electric energy fluctuation state and the physical safety performance of the meter to be detected 20 in the load operating mode, and perform the omnibearing monitoring on the electric energy monitoring performance of the meter to be detected 20, and the meter calibration circuit 10 has flexible calibration and adjustment flexibility for the operating state of the meter to be detected 20 in the load operating mode.

In this embodiment, the feedback current signal includes a load current signal, and the operating power state of the meter 20 to be detected in the load operation mode can be accurately obtained according to the load current signal.

As an alternative implementation, fig. 5 shows a schematic circuit structure of the second power amplifying unit 1022 provided in this embodiment, please refer to fig. 5, where the second power amplifying unit 1022 includes: a second comparator Cmp2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.

The positive phase input end of the second comparator Cmp2 is connected with the reference direct current power supply Vref1, the negative phase input end of the second comparator Cmp2 and the first end of the fourth resistor R4 are connected to the instrument 20 to be detected in common, and then the instrument 20 to be detected outputs a load current signal to the input end of the second comparator Cmp2 in a load working mode so as to start a signal power amplification process; the second end of the fourth resistor R4 and the first end of the fifth resistor R5 are commonly connected to the first end of the sixth resistor R6, and the second end of the fifth resistor R5 is grounded GND.

The second terminal of the sixth resistor R6 and the output terminal of the second comparator Cmp2 are commonly connected to the current verification module 103 and the current display module 104.

Therefore, the second power amplifying unit 1022 in this embodiment has a simplified circuit structure, and the second comparator Cmp2 is used to implement a power amplifying function for the load current signal, thereby improving the accuracy and efficiency of power amplification; furthermore, after the second power amplifying unit 1022 performs proportional amplification on the load current signal, the load detection signal output by the output end of the second comparator Cmp2 has a specific current value, and the internal electric energy fluctuation condition of the to-be-detected meter 20 in the load working mode can be obtained according to the load detection signal, so that the meter verification function of the to-be-detected meter 20 in the load working mode is realized.

As an alternative embodiment, the current reference module 101 includes: the direct current source has a preset current range, wherein the preset current range is 4-20 milliamperes.

The current reference module 101 in this embodiment can output stable and high-precision direct current electric energy to more accurately obtain the electric energy fluctuation condition of the instrument 20 to be detected, and has higher flexibility; the current reference module 101 can output a target current signal with a specific amplitude to match the calibration requirements of the instrument 20 to be tested in different working modes, so that the calibration precision and the calibration stability of the instrument 20 to be tested are greatly guaranteed, and the practical value is high; therefore, the target current signal with a specific amplitude is output through the current reference module 101, the safety of the internal electric energy of the instrument 20 to be detected can be monitored in real time, and the instrument calibration function of the instrument calibration circuit 10 has high flexibility and compatibility.

As an alternative implementation, fig. 6 shows another structural schematic of the meter verification circuit 10 provided in this embodiment, and compared with the structural schematic of the meter verification circuit 10 in fig. 1, the meter verification circuit 10 in fig. 6 further includes: and the overcurrent detection module 106, the overcurrent detection module 106 is connected with the power amplification module 102, and is configured to obtain an overcurrent detection signal according to a difference value between a current value of the detection current signal and a preset safe current value.

After the power amplification module 102 performs power amplification on the current fed back by the meter to be detected 20, the feedback current signal has a specific current value; therefore, in the embodiment, the overcurrent detection module 106 performs current detection on the detected current signal to realize the overcurrent protection function of the internal circuit module of the instrument calibration circuit 10, thereby greatly ensuring the state calibration safety and high efficiency of the instrument calibration circuit 10 for the instrument 20 to be detected; the preset safe current value is used as a safe current judgment limit of the instrument checking circuit 10, and the instrument checking circuit 10 can realize a safe electric energy monitoring function for the instrument 20 to be detected only when the current value of the detected current signal is smaller than or equal to the preset safe current value; when the current value of the detected current signal is greater than the preset safe current value, it indicates that the internal circuit module of the instrument calibration circuit 10 is in an overcurrent state, and the physical safety inside the instrument calibration circuit 10 is greatly damaged; therefore, the over-current detection module 106 in this embodiment can accurately detect the over-current state of the target current signal and obtain an over-current detection result, thereby ensuring the safety and stability of the verification of the instrument 20 to be detected.

Illustratively, when the over-current detection module 106 determines that the meter 20 to be detected is in an over-current state, the over-current protection module performs an over-current protection operation on the power amplification module 102 according to the over-current detection signal, for example, the power amplification process of the power amplification module 102 is suspended, so as to implement an over-current protection function for the circuit modules inside the meter verification circuit 10, and the meter verification circuit 10 has high verification safety and reliability for the meter 20 to be detected.

As an alternative embodiment, the current display module 104 includes: at least any one of an electric current meter and a multimeter.

The ammeter and the multimeter have current detection and digital value display functions, the detection precision is high, so that the digital display value displayed by the current display module 104 can accurately obtain the actual electric energy running state of the instrument 20 to be detected, the high-precision and high-efficiency electric energy monitoring function of the instrument 20 to be detected is realized, and the current display module 104 has low digital display cost and strong controllability; the digital value displayed by the display module 104 can be used for quickly checking the current indicating function of the instrument 20 to be detected, so that the application range and the practical value of the instrument checking circuit 10 are improved.

As an alternative implementation, fig. 7 shows another structural schematic of the meter verification circuit 10 provided in this embodiment, and compared with the structural schematic of the meter verification circuit 10 in fig. 1, the meter verification circuit 10 in fig. 7 further includes: a switch module 107; the switch module 107 is connected between the power amplification module 102 and the meter 20 to be detected, and configured to be turned on or off according to the key signal, and output the feedback current signal to the power amplification module 102 when the switch module is in an on state.

Optionally, the key signal is generated by an external key module, the key module generates the key signal according to the meter verification requirement information of the user, and then the meter verification circuit 10 can perform accurate and real-time function verification on the meter 20 to be detected according to the meter verification requirement of the user, so that the controllability is high.

The switch module 107 has a switching-on or switching-off function, so that the feedback current output process of the instrument 20 to be detected can be controlled through the switch module 107, and the instrument calibration circuit 10 has high control flexibility and control efficiency for the calibration process of the instrument 20 to be detected, so as to meet the instrument calibration requirements of technicians; when the switch module 107 is turned on, and the switch module 107 is in a conducting state, starting a calibration function for the calibration instrument 20 according to a feedback current signal output by the instrument 20 to be tested; on the contrary, when the switch module 107 is turned off, the switch module 107 is in an off state, the power amplification module 102 cannot receive the feedback current signal, at this time, the meter calibration circuit 10 is in a stop state, and the meter calibration circuit 10 cannot calibrate the electric energy detection state of the meter 20 to be detected; therefore, the switch module 107 can adjust the calibration process of the instrument 20 to be tested in real time, which brings good use experience to users, and the instrument calibration circuit 10 can realize the calibration function of the draft precision of the instrument 20 to be tested.

As an alternative embodiment, the switch module 10 comprises: a key switch.

The first end of the key switch is connected to the meter 20, and the second end of the key switch is connected to the power amplification module 102.

The key switch controls a power supply branch between the instrument 20 to be detected and the power amplification module 102 to be switched on or off according to a key signal, the key switch has high control response precision and control response efficiency, and the instrument calibration circuit 10 can calibrate the monitoring function of the instrument 20 to be detected in real time; illustratively, the key switch is turned on according to the key signal, and is turned off when receiving the key signal, so that the key switch has higher operation simplicity and control efficiency, thereby realizing a real-time control function of the calibration process of the instrument to be detected 20, reducing the calibration control cost of the instrument calibration circuit 10, and having wider compatibility.

As an alternative implementation, fig. 8 shows another structural schematic of the meter verification circuit 10 provided in this embodiment, and compared with the structural schematic of the meter verification circuit 10 in fig. 1, the meter verification circuit in fig. 8 further includes: and a filtering module 108, wherein the filtering module 108 is connected to the power amplifying module 102 and configured to filter the detection current signal.

The current checking module 103 detects a current difference between the filtered detection current signal and the target current signal to obtain a current drift amount of the meter 20 to be detected.

The current display module 104 detects the current value of the filtered detected current signal to obtain and display a target digital display value.

After the power amplification module 102 performs power amplification on the electric energy, a certain amount of noise exists in the detection current signal, and the noise amount brings a certain error to the verification process of the meter to be detected 20; therefore, in the embodiment, the filtering module 108 is used to completely eliminate the error amount in the detection current signal, so that the fluctuation state of the internal electric energy of the instrument to be detected 20 can be more accurately obtained according to the detection current signal after filtering processing, a higher precision and more comprehensive calibration function of the instrument to be detected 20 is realized, and the precision and the efficiency of transmission of the internal electric energy of the instrument calibration circuit 10 are ensured; therefore, in the embodiment, the filtering module 108 is used to eliminate the noise interference amount in the instrument verification process, and after the instrument verification circuit 10 verifies the instrument 20 to be detected, the obtained verification result has higher precision and reliability and stronger compatibility; the instrument calibration circuit 10 can be applied to various different industrial technical fields to realize high-precision and quick calibration functions for the instrument 20 to be tested, and has strong anti-interference performance.

As an alternative implementation, fig. 9 shows a schematic circuit structure of the filtering module 108 provided in this embodiment, please refer to fig. 9, where the filtering module 108 includes: at least one filter capacitor (fig. 9 adopts CS1 … CSN, where N is a positive integer greater than or equal to 1) connected in parallel, wherein the first terminal of each filter capacitor is connected to the power amplification module 102, and the second terminal of each filter capacitor is connected to the GND.

The filtering module 108 in this embodiment has a relatively compatible circuit structure, and eliminates the interference amount in the electric energy in real time by using the parallel filtering capacitors, so that the flexibility of the circuit structure of the instrument checking circuit 10 is improved, and the monitoring performance of the instrument 20 to be detected can be detected and checked in an all-around and high-precision manner according to the detection current signal after filtering processing, thereby greatly ensuring the controllability and adaptability of the instrument checking circuit 10 to the checking process of the instrument 20 to be detected, and meeting the checking precision requirement of a user.

For example, fig. 10 shows a schematic circuit structure of the current checking module 103 provided in this embodiment, referring to fig. 10, the current checking module 103 includes: a third comparator Cmp3, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9.

The first end of the seventh resistor R7 is connected to the current reference module 101, the first end of the eighth resistor R8 is connected to the power amplification module 102, the second end of the seventh resistor R7 is connected to the inverting input terminal of the third comparator Cmp3, the second end of the eighth resistor R8 is connected to the non-inverting input terminal of the third comparator Cmp3, and the output terminal of the third comparator Cmp3 is used for outputting the current drift amount of the meter 20 to be detected.

In the embodiment, after the current difference value between the target current signal and the detection current signal is detected and output by the third comparator Cmp3, the internal electric energy error amount of the instrument to be detected 20 is obtained, and then the internal electric energy of the instrument to be detected 20 is monitored in real time to ensure the safety of the internal electric energy of the instrument to be detected 20, the current verification module 103 has higher verification accuracy and verification efficiency for the internal electric energy of the instrument to be detected 20, and the internal circuit structure of the current verification module 103 is simplified; therefore, the meter calibration circuit 10 can accurately detect and analyze the detection function of the meter to be detected 20, and is beneficial to simplifying the calibration control steps of the meter detection circuit 10 on the meter to be detected 20.

Fig. 11 shows a structural schematic diagram of an instrument checking system 110 applied to a control room of a power plant provided in this embodiment, please refer to fig. 11, where the instrument checking system 110 includes the instrument checking circuit 10 and the instrument to be detected 20 as described above, where the instrument checking circuit 10 is connected to the instrument to be detected 20, and the instrument checking circuit 10 can perform real-time checking on a monitoring function of the instrument to be detected 20 to ensure operation stability and safety of the instrument to be detected 20, so as to further detect an operation state and physical safety of a relevant power supply device of the power plant in a power supply process in real time through the instrument to be detected 20, which is beneficial to improving power supply safety and power supply efficiency of the power plant; the instrument calibration system 110 has a high electric energy calibration function, and can be universally applied to different industrial technical fields, so that the real-time monitoring and safety guarantee functions of the power supply process are realized, and the power supply stability is maintained; thereby solved effectively that traditional technique can't carry out the high accuracy check-up to instrument control equipment, the power supply security and the stability that lead to the power plant are lower, are difficult to satisfy user's power supply control demand, practical value lower problem.

In summary, the instrument calibration circuit in the embodiment of the application can perform a high-precision and high-efficiency calibration function on the instrument to be detected, is time-saving and labor-saving, can realize automatic and comprehensive detection on the monitoring performance of the instrument to be detected on the basis of not influencing the normal electric energy monitoring function of the instrument to be detected, and can ensure the accuracy, safety and reliability of the calibration of the instrument; the feedback current signal of the instrument to be detected is automatically acquired and analyzed, so that the human error is eliminated, the maintenance and calibration time is saved, the cost is saved, and the human error in the instrument calibration process in the traditional technology is solved; the instrument to be detected is used as an important component in modern power production, and the verification quality of the instrument to be detected is directly related to the production safety of power and is more related to the personal safety of personnel; the instrument calibration circuit in the embodiment has important significance for enhancing the instrument calibration working quality, improving the safety of production enterprises, and ensuring the economic benefits of enterprises and the personnel safety.

Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.

Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. The utility model provides a be applied to instrument check-up circuit of power plant's control room, is connected with the instrument of waiting to detect which characterized in that, instrument check-up circuit includes:

2. The meter verification circuit of claim 1,

the current reference module includes:

the power amplification module includes:

3. The meter verification circuit of claim 2, wherein the first power amplification unit comprises:

4. The meter verification circuit of claim 1,

the current reference module includes:

the power amplification module includes:

5. The meter verification circuit of claim 1, wherein the current reference module comprises: the direct current source has a preset current range, wherein the preset current range is 4-20 milliamperes.

6. The meter verification circuit of claim 1, further comprising:

7. The meter verification circuit of claim 1, wherein the current display module comprises: at least any one of an electric current meter and a multimeter.

8. The meter verification circuit of claim 1, further comprising:

9. The meter verification circuit of claim 8, wherein the switch module comprises:

a key switch;

10. The meter verification circuit of claim 1, further comprising: