CN201021936Y - Integrated device for electric energy meter calibration and digital withstand voltage verification - Google Patents

Abstract

The utility model discloses an integrated device for calibrating electric energy meters and testing voltage resistance, which comprises a calibrating device and a testing device for withstand voltage. The electric energy meter to be checked is connected, and the high-voltage relay is controlled by the switch to switch between the verification device and the withstand voltage test device. The start-up test, creep test, error test, constant test and AC withstand voltage test of the meter are completed through a simple switch, without the need to repeatedly hook up the meter, wire, repeatedly enter meter information and midway transfer links, one-time wiring All the verification items can be completed, thereby reducing the amount of labor and improving work efficiency.

Description

Integrated device for electric energy meter calibration and digital withstand voltage verification

technical field

The utility model relates to a verification device for an electric energy meter, in particular to an integrated device for verifying the electric energy meter and verifying the withstand voltage of the word.

Background technique

The starting test, creep test, error test, constant test and AC withstand voltage test of the electric energy meter are very important links in the verification work of the electric energy meter. In the prior art, the calibration equipment and withstand voltage test equipment of electric energy meters at home and abroad are separated, and the calibration work such as start-up, creep, error, constant test, etc. on the pressure device. After completing a verification work, the verification workers have to repeatedly hook up the meter and repeatedly enter the meter information. There is a midway transfer link, which results in a large workload and low efficiency. Although the two test items are different, the wiring can be the same for the energy meter.

Therefore, there is a need for a verification device for electric energy meters, which can complete the start-up test, creep test, error test, constant test and AC withstand voltage test of the electric energy meter through simple switching without repeatedly connecting the meter, Repeated entry of meter information and midway transfer links to improve work efficiency.

Utility model content

In view of this, the purpose of this utility model is to provide an integrated device for electric energy meter calibration and digital withstand voltage verification, which can pass the starting test, creep test, error test, constant test and AC withstand voltage test of the electric energy meter. It can be completed by simple switch switching, without the need to repeatedly hook up the meter, repeatedly enter the meter information and transfer in the middle, thereby reducing the labor load and improving work efficiency.

The utility model integrated device for calibration of electric energy meter and verification of digital withstand voltage includes a calibration device and a withstand voltage test device. The calibration device consists of the following circuits: the high-end and low-end outputs of the program-controlled voltage The voltage input high end and low end of the electric energy meter for detection are connected, the standard electric energy meter and the electric energy meter to be tested are connected in parallel at the high end and low end of the program-controlled voltage source, the signal output end of the standard electric energy meter is connected with the error calculation system, and the error calculation system is from The watt-hour meter to be tested obtains the pulse signal through connection or image sampling; the program-controlled current source, the standard watt-hour meter and the watt-hour meter to be tested are connected in series to form a circuit; the program-controlled voltage source and the program-controlled current source are respectively connected to the voltage and current phase display; The test device consists of the following circuits: the high-end output of the AC withstand voltage meter is connected to the high-end input of the tested electric energy meter, and the low-end output is connected to the ground terminal of the tested electric energy meter; the high-end output of the program-controlled voltage source is connected to the input of the tested electric energy meter A high-voltage relay III is also connected between the terminals, and a high-voltage relay V is also connected between the low-end output of the program-controlled voltage source and the ground terminal of the watt-hour meter to be tested; Among them, a high-voltage relay II is connected in series between the standard electric energy meter and the tested electric energy meter, and a high-voltage relay IV is connected in series between the tested electric energy meter and the negative electrode of the program-controlled current source;

The high-end output of the AC withstand voltage instrument is connected to the input terminal of the tested electric energy meter through the other input contact of the high-voltage relay III, and the low-end output is connected to the ground terminal of the tested electric energy meter through the high-voltage relay I; the leakage current sampling signal processing indicator is connected in series Connected between the low-end output of the AC withstand voltage meter and the ground terminal of the electric energy meter under test, and its leakage current output is grounded after driving the contact of the high-voltage relay I;

The driving contacts of the high voltage relay II, the high voltage relay III, the high voltage relay IV and the high voltage relay V are connected in parallel to the driving power supply through the transfer switch.

Further, the high-voltage and low-voltage lines in the circuit of the integrated device circuit for the verification of the electric energy meter and the digital withstand voltage test are respectively wired;

Further, the integrated device for verification of the electric energy meter and the verification of the digital voltage withstand is equipped with an insulating sleeve on the output circuit of the electric energy meter to be checked;

Further, the circuit in the integrated device of electric energy meter verification and digital withstand voltage verification adopts insulated wires with a withstand voltage of more than 4000V, and the high-voltage relay I, high-voltage relay II, high-voltage relay III, high-voltage relay IV) and high-voltage relay The withstand voltage of V is greater than 10000V.

The beneficial effect of the utility model is that: the integrated device of the electric energy meter verification and the digital withstand voltage verification of the utility model combines the verification device and the pressure resistant device into one, and can integrate the starting test, potential The dynamic test, error test, constant test and AC withstand voltage test are completed through simple switch switching, without the need to repeatedly connect the meter, repeatedly enter the meter information and transfer links in the middle, and complete all the verification items with one connection, so that Reduce labor and improve work efficiency.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Accompanying drawing is the schematic diagram of the utility model;

Detailed ways

Accompanying drawing is the schematic diagram of the utility model, as shown in the figure: the model is HY9153 checking device 1 and the output terminal of pressure-resistant test device 2 is connected with the watt-hour meter 4 to be checked. The model of the high voltage relay is LRL-102-100PCV.

The verification device 1 is composed of the following circuits: the high-end output of the program-controlled voltage source 11 is connected to the input terminal of the tested electric energy meter 4 through the high-voltage relay III33, and the low-end output is connected to the low voltage end of the tested electric energy meter 4 through the high-voltage relay V35. Electric energy meter 13 and tested electric energy meter 4 are connected in parallel at the high end and low end of program-controlled voltage source 11, and the signal output terminal of standard electric energy meter 13 is connected with error calculation system 14, and error calculation system 14 passes through image from tested electric energy meter 4 Sampling to obtain pulse signals; program-controlled current source 12 is connected in series with standard electric energy meter 13, high-voltage relay II 32, tested electric energy meter 4 and high-voltage relay IV34 to form a circuit; connected.

The withstand voltage test device 2 is composed of the following circuits: the high-end output of the AC withstand voltage instrument 21 of model CY2671-D6A is connected to the input terminal of the tested electric energy meter 4 through the high-voltage relay III33, and the low-end output is connected to the tested electric energy meter through the high-voltage relay I31. Table 4 is connected to the ground terminal; the leakage current sampling signal processing indicator 22 is connected in series between the low-end output of the AC withstand voltage instrument 21 and the ground terminal of the tested electric energy meter 4, and its leakage current output is grounded after driving the contact through the high voltage relay I31.

Of course, the above elements or instruments can not limit the protection scope of the present utility model, and are not limited to the models or types given in the above embodiments, and other models or types of elements or instruments can also be used to achieve the purpose.

In this embodiment, when the relay is in a normally closed state, the verification device 1 is connected to the electric energy meter 4 to be tested.

During use, when carrying out the withstand voltage test, the changeover switch 5 turns to the withstand voltage. The drive power supply 6 drives the normally open contacts of the high voltage relay III33 to pull in, and connects the AC withstand voltage instrument 21. The connection between the electric energy meter 4 and the verification device 1 . Manually set to the corresponding withstand voltage level, start the withstand voltage button, and the output voltage of the AC withstand voltage instrument 21 is output to the electric energy meter under inspection through the high voltage relay III33 and the high voltage relay I31 which is normally closed, for the withstand voltage test. Each meter has leakage current sampling and signal processing instructions. After the leakage current exceeds the set value, the leakage current sampling signal processing indicator 22 makes the high-voltage relay I 31 pull in and cut off the high-voltage generator circuit to achieve safety and easy operation. .

When checking, the switch 5 turns to check. Switch 5 disconnects drive power 6, high voltage relay II32, high voltage relay III33, high voltage relay IV34, high voltage relay V35 return to the normally closed state, the electric energy meter 4 to be tested is connected to the calibration device 1, and at the same time, the AC withstand voltage meter is disconnected. 21, the output voltage and current of the program-controlled voltage source 11 and current source 12 are output to the standard electric energy meter and the tested electric energy meter through the high-voltage relay, and the error result is obtained through the error calculation system.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (4)

1. electrical energy meter calibration, the withstand voltage calibrating integrated apparatus of having good luck, comprise calibration equipment (1) and the withstand voltage test unit of having good luck (2), described calibration equipment (1) is made up of following circuit: the high-end and low side output of program-controlled voltage source (11) links with low side with the voltage input of tested electric energy meter (4) is high-end respectively, standard electric energy meter (13) and the high-end and low side of tested electric energy meter (4) parallel connection at program-controlled voltage source (11), standard electric energy meter (13) signal output part and Error Calculation system (14) link, and Error Calculation system (14) obtains pulse signal from tested electric energy meter (4) by on line or image sampling; Programmable current source (12), standard electric energy meter (13) and tested electric energy meter (4) are followed in series to form the loop; Program-controlled voltage source (11) and programmable current source (12) link with electric current and voltage phase place display (15) respectively; The withstand voltage test unit of having good luck (2) is made up of following circuit: high-end output of ac voltage withstanding instrument (21) and high-end the linking of tested electric energy meter (4) input, and low side output links with tested electric energy meter (4) earth terminal; It is characterized in that: also be connected to high-voltage relay III (33) between the input end of high-end output of described program-controlled voltage source (11) and tested electric energy meter (4), the output of program-controlled voltage source (11) low side also is connected to high-voltage relay V (35) with the earth terminal of tested electric energy meter (4); In the loop that described programmable current source (12), standard electric energy meter (13) and tested electric energy meter (4) are followed in series to form, also be in series with high-voltage relay II (32) between standard electric energy meter (13) and the tested electric energy meter (4), also be in series with high-voltage relay IV (34) between tested electric energy meter (4) and programmable current source (12) negative pole;

The high-end output of ac voltage withstanding instrument (21) links through another input contact of high-voltage relay III (33) and tested electric energy meter (4) input end, and low side output links with tested electric energy meter (4) earth terminal through high-voltage relay I (31); The leakage current sampled signal is handled indicator (22) and is serially connected between output of ac voltage withstanding instrument (21) low side and tested electric energy meter (4) earth terminal, and its leakage current output is by ground connection behind high-voltage relay I (31) contact-actuating;

The contact-actuating of high-voltage relay II (32), high-voltage relay III (33), high-voltage relay IV (34), high-voltage relay V (35) is connected in parallel on the driving power (6) by switch (5).

2. electrical energy meter calibration according to claim 1, the withstand voltage calibrating integrated apparatus of having good luck is characterized in that: described electrical energy meter calibration, have good luck withstand voltage calibrating integrated apparatus circuit mesohigh and low-voltage circuit connect up respectively.

3. electrical energy meter calibration according to claim 1 and 2, the withstand voltage calibrating integrated apparatus of having good luck is characterized in that: described electrical energy meter calibration, the resistance test of having good luck integrated apparatus install insulating sleeve additional to the output circuit of tested electric energy meter (4).

4. electrical energy meter calibration according to claim 3, the withstand voltage calibrating integrated apparatus of having good luck, it is characterized in that: the circuit in described electrical energy meter calibration, the withstand voltage calibrating integrated apparatus of having good luck adopts the above insulated line of withstand voltage 4000V, and high-voltage relay I (31), high-voltage relay II (32), high-voltage relay III (33), high-voltage relay IV (34) and high-voltage relay V (35) voltage endurance capability are greater than 10000V.

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