CN101281243A - Equipotential closed-loop electric energy meter inspection device and inspection method - Google Patents

Abstract

The invention provides an equipotential closed-loop electric energy meter inspection device, which includes a program-controlled three-phase power source, a three-phase multifunctional standard meter, a wall meter stand, an error calculation/display, a control system with control software, and an isolated meter stand connected to the The precise current transformer CT of the electric energy meter table position current; the said program-controlled three-phase power source output voltage to the said three-phase multifunctional standard meter and the detected electric energy meter connected on the said rack; the said program-controlled three-phase The power source outputs current to the three-phase multifunctional standard meter and the detected electric energy meter through the precision current transformer CT; the error calculation/display is connected to the three-phase multifunctional standard meter and the detected electric energy meter; the control The system is connected with the program-controlled three-phase power source, the three-phase multifunctional standard meter, the detected electric energy meter and the error calculation/display. The inspection device of the three-phase potential and closed-loop electric energy meter provided by the invention can verify many electric energy meters at one time, improves the work efficiency of the metering department and reduces errors.

Description

Equipotential closed-loop electric energy meter inspection device and inspection method

【Technical field】

The invention relates to a testing device for three-phase potential and closed-loop electric energy meters, in particular to a device for simultaneously testing multiple meters through a precision current transformer CT.

【Background technique】

In the power system, all kinds of electric energy meters need to verify their electric energy measurement errors before they are connected to the grid. Only those electric energy meters with qualified electric energy errors are allowed to be connected to the network, because the usage of electric energy meters is large. For the three-phase potential and closed-loop electric energy meter, because the voltage high-end terminal and the current terminal cannot be separated, the general inspection device can only inspect one three-phase electric potential and closed-loop electric energy meter during inspection, but when inspecting multiple three-phase electric potential, When the closed-loop electric energy meter will have a large influence between the table positions, it will increase the electric energy error.

【Content of invention】

In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a testing device for an equipotential closed-loop electric energy meter, which solves the problems in the prior art of large influence between epitopes and large electric energy errors during multi-meter detection.

The present invention is realized through the following technical solutions: designing and manufacturing an equipotential closed-loop watt-hour meter inspection device, including a program-controlled three-phase power source, a three-phase multifunctional standard meter, a hanging meter rack, an error calculation/display, and a control software The control system and the precision current transformer CT that isolates the meter position current of the hanging meter stand; the output voltage of the program-controlled three-phase power source is given to the three-phase multi-function standard meter and the detected electric energy meter connected to the hanging meter stand ; The program-controlled three-phase power source output current is given to the three-phase multi-function standard meter and the detected electric energy meter by the precision current transformer CT; the error calculation/display is connected to the three-phase multi-function standard meter and the detected electric energy meter Electric energy meter; the control system is connected with the program-controlled three-phase power source, the three-phase multifunctional standard meter, the detected electric energy meter and the error calculation/display.

According to a preferred embodiment of the present invention, the detected electric energy meters include three equipotential electric energy meters, closed-loop electric energy meters and non-equal potential electric energy meters.

According to a preferred embodiment of the present invention, the error calculation/display includes a calculator that can collect standard electric energy pulses and detected electric energy pulses and can perform corresponding processing, and a timer that can collect and measure continuous standard electric energy pulse cycle pulse widths and display screen.

According to a preferred embodiment of the present invention, the precision current transformer CT corresponds to the detected electric energy meter; the detected electric energy meter is one or more detected electric energy meters.

According to a preferred embodiment of the present invention, the input terminal and the output terminal of the precision current transformer CT are automatically compensated by differential amplification through a current compensation circuit.

A kind of inspection method of equipotential closed-loop electric energy meter, described inspection method comprises the following steps:

Step 100 The control system sets corresponding parameters;

Step 200 error calculation/display processing of pulse signal;

Step 300 The control system calibrates the detected electric energy meter according to the calibration standard.

According to a preferred embodiment of the present invention, the corresponding parameter setting in the step 100 includes the control system controlling the current output range of the precision current transformer CT through the set current value according to the inspection requirements, setting the program-controlled three-phase The output voltage of the power source, the current signal, the error limit and the current output range of the precision current transformer CT are controlled by the set current value control.

According to a preferred embodiment of the present invention, the step 200 specifically includes the following steps:

Step 201 Electric energy error calculation/display collects the pulse information of the three-phase multifunctional standard meter and the detected electric energy meter;

Step 202 Power error calculation/display performs power error calculation;

Step 203 The electric energy error calculation/display returns the error result to the control system.

According to a preferred embodiment of the present invention, the pulse information in step 201 includes the number of the three-phase multifunctional standard meter and the detected electric energy meter and the width of each cycle.

According to a preferred embodiment of the present invention, the verification in step 300 is to compare the pulse error value returned by the error calculation/display with a preset error limit.

The beneficial effects of the present invention are: the inspection device of the three-phase potential and closed-loop electric energy meter provided by the present invention adopts a precision current transformer CT, which provides smaller influence between the table positions, reduces the error of electric energy, and solves the problem of three-phase electric potential and closed-loop electric energy at the same time. The multi-table site inspection of the meter is compatible with the non-equipotential electric energy meter inspection, which improves the efficiency of the metering staff and the accuracy of the inspection.

【Description of drawings】

Fig. 1 is a block diagram of an example of the electric energy meter inspection device of the present invention.

Fig. 2 is a schematic diagram of the current flow of the precision current transformer CT in the electric energy meter inspection device of the present invention.

Fig. 3 is an overall flow chart of the inspection method of the electric energy meter inspection device of the present invention.

【Detailed ways】

The invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

An equipotential closed-loop watt-hour meter inspection device, as shown in Figure 1, includes a program-controlled three-phase power source 1, a three-phase multifunctional standard meter 2, and is characterized in that: it also includes a hanging meter rack, an error calculation/display 3, and a control software The control system 4 and the precision current transformer CT5 for isolating the meter current of the hanging meter stand; the output voltage of the program-controlled three-phase power source 1 is given to the three-phase multi-function standard meter 2 and the controlled device connected to the hanging meter stand Detect electric energy meter 6; said program-controlled three-phase power source 1 output current to said three-phase multi-function standard meter 2 and the detected electric energy meter 6 through said precision current transformer CT5; said error calculation/display 3 is connected The three-phase multifunctional standard meter 2 and the detected electric energy meter 6; Error Calculation/Display Connection3.

The precision CT is a precision current transformer, which adopts a 100A/5A dual-range method to ensure small current technical indicators.

In one embodiment, as shown in Figure 2, the precision current transformer CT5 is divided into two ranges of 5A and 100A by inputting an alternating current of 0-5A. In order to ensure that the technical indicators of each range meet the requirements of the electric energy meter inspection device, the The precision current transformer CT adopts a current compensation circuit, and automatically compensates the output end by sampling the current at the output end and the input end through differential amplification. Requires automatic switching and manual switching according to the output current requirements in the disengaged state to ensure the accuracy of the output current. The current is isolated by the precision current transformer CT5 before passing through the electric energy meter to be tested, which avoids the error caused by the connection of voltage and current into the system, thereby ensuring the error consistency of each meter position.

The error calculation/display 3 includes a calculator capable of collecting standard electric energy meter pulses and detected electric energy meter pulses and performing corresponding processing, a timer and a display screen capable of collecting and measuring continuous standard electric energy pulse period pulse widths. The calculator is used to calculate and count the received pulse information and perform corresponding processing, the timer is mainly used to collect the periodic pulse width, and the information of the electric energy error information, the number of pulses and the pulse width will be It is displayed on the display screen for easy viewing.

The precision current transformer CT5 corresponds to the detected electric energy meter 6 ; the detected electric energy meter 6 is one or more detected electric energy meters 6 . Multiple detected electric energy meters 6 can be connected to the detection device, and multiple detected electric energy meters 6 can be connected to the detection device at one time for detection to check whether the detected electric energy meters meet the specifications. The detected electric energy meter 6 may be a three-phase equipotential electric energy meter, a closed-loop electric energy meter and a non-equal potential electric energy meter.

A kind of inspection method of equipotential closed-loop electric energy meter, as Fig. 3, described inspection method comprises the following steps:

Step 100 The control system sets corresponding parameters;

Step 200 error calculation/display processing of pulse signal;

Step 300 The control system calibrates the detected electric energy meter according to the calibration standard.

The corresponding parameter setting in the step 100 includes the control system controlling the current output range of the precision current transformer CT through the set current value according to the inspection requirements, setting the output voltage of the program-controlled three-phase power source, the current signal, the error limit and The current output range of the precision current transformer CT is controlled by the set current value control. Before parameter setting, it is necessary to check whether the corresponding hardware has been started. If not, it is necessary to start the corresponding hardware, including error calculation/display, three-phase multi-function standard meter.

The step 200 specifically includes the following steps:

Step 201 Electric energy error calculation/display collects the pulse information of the three-phase multifunctional standard meter and the detected electric energy meter;

Step 202 Power error calculation/display performs power error calculation;

Step 203 The electric energy error calculation/display returns the error result to the control system.

The pulse information in step 201 includes the number of the three-phase multifunctional standard meter and the detected electric energy meter and the width of each cycle.

The verification in step 300 is to compare the pulse error value returned by the error calculation/display with the preset error limit.

Energy error calculation/display first collects the pulse information in the three-phase standard energy meter and the detected energy meter, then analyzes the number of pulses and the pulse width of the pulse cycle, and calculates the energy error at the same time. The calculated results and some basic information of the pulse are displayed on the display screen, and by returning the error value to the control system, the control system converts the error value into identifiable information through conversion and compares it with the preset error limit , if the error value returned by the tested watt-hour meter is larger than the set maximum error value, it means that the tested watt-hour meter does not conform to the specification, otherwise it means that the tested watt-hour meter meets the specification.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1, a kind of equipotential closed loop electrical energy meter verifying attachment, comprise program control three phase power source (1), three-phase multifunctional standard scale (2), it is characterized in that: also comprise meter hanging frame, Error Calculation/display (3) is provided with the control system (4) of Control Software and the precision current mutual inductor CT (5) that isolates meter hanging frame epi-position electric current; Described program control three phase power source (1) output voltage is given described three-phase multifunctional standard scale (2) and is connected in detected electric energy meter (6) on the described meter hanging frame; Described program control three phase power source (1) output current is given described three-phase multifunctional standard scale (2) and is passed through the detected electric energy meter (6) of described precision current mutual inductor CT (5); Described Error Calculation/display (3) connects described three-phase multifunctional standard scale (2) and detected electric energy meter (6); Described control system (4) is connected (3) with described program control three phase power source (1), described three-phase multifunctional standard scale (2), described detected electric energy meter (6) and described Error Calculation/display.

2, equipotential closed loop electrical energy meter verifying attachment according to claim 1 is characterized in that: described detected electric energy meter (6) comprises three-phase equipotential electric energy table, closed loop electrical energy meter and non-equipotential electric energy table.

3, equipotential closed loop electrical energy meter verifying attachment according to claim 1 and 2 is characterized in that: described Error Calculation/display (3) comprises can be gathered standard electric energy meter pulse and detected electric energy meter pulse and the counter that can handle accordingly and can gather timer and the display screen of measuring continuous standard electric energy impulse cycle pulsewidth.

4, equipotential closed loop electrical energy meter verifying attachment according to claim 1 is characterized in that: described precision current mutual inductor CT (5) is corresponding with described detected electric energy meter (6).

5, according to claim 1 or 4 described equipotential closed loop electrical energy meter verifying attachments, it is characterized in that: the input end of described precision current mutual inductor CT (5) and output terminal carry out difference by current compensation circuit and amplify compensation automatically.

6, a kind of method of inspection of equipotential closed loop electrical energy meter is characterized in that: the described method of inspection may further comprise the steps:

Step 100 control system is set relevant parameter;

The processing of step 200 Error Calculation/display pulse signals;

Step 300 control system is carried out verification by the verification standard to detected electric energy meter.

7, the method for inspection according to claim 6 is characterized in that: relevant parameter described in the described step 100 set comprise described control system by examination requirements by the current output journey of the current value control precision current mutual inductor CT that is provided with, the current output journey of setting program control three phase power source output voltage, current signal, the limits of error and controlling described precision current mutual inductor CT by the current value that is provided with.

8, the method for inspection according to claim 6 is characterized in that: described step 200 specifically comprises following step:

Step 201 Error Calculation/display is gathered the pulse information of three-phase multifunctional standard scale and detected electric energy meter;

Step 202 electric energy error calculating/display carries out electric energy error and calculates;

Step 203 electric energy error calculating/display return error result is to control system.

9, the method for inspection according to claim 8 is characterized in that: the pulse information in the described step 201 comprises number and each periodic width of described three-phase multifunctional standard scale and described detected electric energy meter.

10, the method for inspection according to claim 6 is characterized in that: the pulse error amount that being verified as in the described step 300 returned according to Error Calculation/display and the default limits of error compare.

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