CN203572957U - On-site meter calibration system - Google Patents

Abstract

The utility model relates to the technical field of electric energy measurement and inspection, and discloses an on-site meter calibration system, which includes an electric energy meter (1) and a user load (3). The output end is connected to the user load (3), and the standard meter (2) and the test load (4) are also included. The two input ends of the standard meter (2) are respectively connected to the mains live wire and the test load through two clamps (5). Neutral line, the output end of the standard meter (2) is connected to the input end of the test load (4) or the input end of the user load (3), and is connected between the clamp (5) on the mains live wire and the standard meter (2) A sliding rheostat (6) is also connected. The utility model provides an on-site meter calibration system with simple structure, convenient use and low cost. The meter calibration personnel do not need to disassemble the electric energy meter and send it back for experimental verification, which reduces the work intensity of the staff.

Description

On-site meter calibration system

technical field

The utility model relates to the technical field of electric energy measurement and inspection, in particular to an on-site meter calibration system.

Background technique

The electric energy meter is an instrument used to measure electric energy. Small changes in measurement accuracy will directly affect the interests of all parties. In addition to periodic verification within the cycle, on-site inspection should also be carried out during operation.

At present, the standard electric energy meter is generally used in laboratory verification to verify the electric energy meter to be tested. This kind of standard electric energy meter generally has higher accuracy and better stability, and its cost is also higher than that of the electric energy meter to be tested.

In the on-site test, the on-site meter calibration instrument is generally used, but the on-site meter calibration instrument has a complex structure and high cost, and is not suitable for some old communities. There is also a meter calibration method that disassembles the user's electric energy meter to be tested and brings it back to the laboratory for testing. , but this method not only brings inconvenience to the user, but also increases the work intensity of the meter calibration personnel by disassembling, installing and transporting the energy meter.

Utility model content

The technical problem to be solved by the utility model is that: aiming at the above-mentioned deficiencies in the prior art, the utility model provides an on-site meter calibration system with simple structure, convenient use and portability.

In order to achieve the above-mentioned purpose, the on-site meter calibration system of the present invention includes an electric energy meter and a user load. For the test load, the two input ends of the standard gauge are connected to the mains live wire and the neutral wire respectively through two clips, the output end of the standard meter is connected to the input end of the test load or the input end of the user load, and connected to the clamp on the mains live wire A sliding rheostat is also connected between the head and the standard meter, which is used to adjust the power of the circuit where the standard meter is located so that the power on this circuit is the same as the power of the circuit where the electric energy meter is located.

As a further improvement of the utility model, a switch is connected between the clamp and the standard meter, and the sliding rheostat is located between the switch and the standard meter.

Further, the above-mentioned on-site meter calibration system also includes a timer associated with the switch, and the two input terminals of the timer are connected to the live wire and the neutral wire of the mains through the switch.

Further, a fuse is also connected between the above-mentioned switch connected to the mains live wire and the sliding rheostat.

Further, the maximum resistance of the above-mentioned sliding rheostat is not greater than 1 ohm.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. With the on-site meter calibration system of the present invention, the meter calibration personnel do not need to remove the user’s electric energy meter and bring it back to the laboratory, which makes on-site meter calibration more convenient and reduces the workload of the meter calibration personnel;

2. The utility model has the advantages of simple structure, convenient use and low cost, and realizes on-site meter calibration at low cost.

Description of drawings

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a schematic structural view of Embodiment 1.

Legend: 1. Energy meter; 2. Standard meter; 3. User load; 4. Test load; 5. Chuck; 6. Sliding rheostat; 7. Fuse; 8. Switch; 9. Timer.

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

【Example 1】

As shown in Figure 2, the on-site meter calibration system of this embodiment includes an electric energy meter 1, a standard meter 2, and a user load 3: the two input terminals of the electric energy meter 1 are respectively connected to the mains live line L and the neutral line N, and the output connected to the input end of the user load 3 to form the first loop; the two input ends of the standard meter 2 are respectively connected to the mains live line L and the neutral line N through two clamps 5, and the output end is connected to the input end of the user load 3 to form a The second circuit, in the second circuit, a sliding rheostat 6 is also connected between the chuck 5 connected to the mains live wire L and the standard gauge 2, and the maximum resistance of the sliding rheostat 6 is not more than 1 ohm.

Under normal circumstances, in the meter box where the user installs the electric energy meter 1, a section of the mains live line L and the neutral line N before the two access terminals of the electric energy meter 1 is exposed. In this scheme, two chucks 5 are used to clamp respectively Hold the bare section of the mains live wire L and the neutral wire N, and connect the two input terminals of the standard meter 2 through the wire connected with the clamp 5, and the output terminal of the standard meter 2 is connected to the same load as the output terminal of the energy meter 1 , since the standard meter 2 is a standard electric energy meter commonly used in the current laboratory, its parameters (power, internal resistance, etc.) are the same as those of the normal working electric energy meter 1, and its adjustment in the laboratory is accurate and stable. When they are connected to the same load, the speed and energy measurement of the energy meter 1 and the standard meter 2 are theoretically the same. If the energy meter 1 has an error, it can be detected by comparing the standard meter 2. In actual work, in the second loop, the sliding rheostat 6 is also connected before the standard meter 2, which can be used to adjust the total power on the second loop to ensure that the total power of the sliding rheostat 6 and the standard meter 2 is the same as the total power of the electric energy meter 1 same for comparison. Since the internal resistance of the standard meter 2 is small, the difference between the internal resistance of the standard meter 2 and that of the electric energy meter 1 is also very small, so the resistance value of the sliding rheostat 6 cannot be too large, and it is limited between 0.1 ohm and 1 ohm in this embodiment.

[Example 2]

As shown in Figure 1, the difference between this embodiment and Embodiment 1 is: the on-site meter calibration system in this embodiment also includes a test load 4, and the output end of the standard meter 2 is not connected to the input end of the user load 3 but connected Input to test load 4. In practical applications, since the installation of various electrical appliances in the user's home is relatively fixed, it may be inconvenient to connect the standard meter 2 to the user's load 3. In this embodiment, a test load 4 with the same power as the user's load 3 is prepared. For example, during the test, the user uses a 20W fluorescent lamp, which is the user load 3, and the tester also prepares a 20W fluorescent lamp as the test load 4, which is directly connected to the output terminal of the standard meter 2, so as not to damage the user's wiring, and is convenient Measurement.

[Example 3]

On the basis of Embodiment 1 or Embodiment 2, in this embodiment, a switch 8 and a fuse 7 are also connected between the chuck 5 and the standard meter 2, and on the live wire connection circuit, the switch 8 is followed by the fuse 7 in sequence , Sliding rheostat 6, standard table 2. In this scheme, setting switch 8 is convenient for controlling the test time. After the meter calibration system is installed, switch 8 is turned on for testing according to the test requirements, and switch 8 is turned off at the end of the test. The current of the second loop tested is too high.

The switch 8 is also connected with a timer 9 which is linked with it. The two input ends of the timer 9 are connected to the live line L and the neutral line N of the mains through the switch 8. When the switch 8 is turned off and the test is started, the timer 9 starts timing. Compared with manual timing, timer 9 is more accurate and convenient.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (5)

1. on-the-spot formula meter correcting system, comprise electric energy meter (1) and user load (3), two input ends of electric energy meter (1) are connected with zero line with civil power live wire respectively, output terminal connects user load (3), it is characterized in that, also comprise standard scale (2) and test load (4), two input ends of standard scale (2) connect respectively civil power live wire and zero line by two chucks (5), the input end of the output terminal connecting test load (4) of standard scale (2) or the input end of user load (3), be connected between chuck (5) on civil power live wire and standard scale (2) and be also connected with slide rheostat (6).

2. on-the-spot formula meter correcting system according to claim 1, is characterized in that, between described chuck (5) and standard scale (2), is also connected with switch (8), and described slide rheostat (6) is positioned between switch (6) and standard scale (2).

3. on-the-spot formula meter correcting system according to claim 2, is characterized in that, also comprises and the timer (9) of switch (8) interlock, and two input ends of timer (9) are by switch (8) access civil power live wire and zero line.

4. according to the on-the-spot formula meter correcting system described in claim 2 or 3, it is characterized in that, be connected between switch (8) on civil power live wire and slide rheostat (6) and be also connected with fuse (7).

5. according to the arbitrary described on-the-spot formula meter correcting system of claims 1 to 3, it is characterized in that, the maximum value of slide rheostat (6) is not more than 1 ohm.

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