CN203455387U - Detachable current transformer of three-phase electric energy meter field calibrator - Google Patents

Abstract

The utility model discloses a detachable current transformer of a three-phase electric energy meter field calibrator, which is characterized in that it comprises a detachable external current transformer module installed on the three-phase electric energy meter calibrator; The current transformer module includes three current transformers, the primary winding terminals of the three current transformers are respectively connected to a primary current terminal , and the secondary winding terminals of the three current transformers are connected to the secondary terminal; The secondary wiring port matches and electrically communicates with the current measurement interface on the calibrator. The current transformer module of the utility model and the main body of the calibrator adopt an external split method, and can be used in combination with the calibrator according to needs, or can be disassembled from the calibrator to reduce the volume of the field calibrator for electric energy meters. Taking into account the measurement accuracy and the convenience of portability and use, the miniaturization and palm-type operation of the electric energy meter field calibrator are realized. The utility model can be widely used in field calibration instruments for electric energy meters.

Description

Three-phase electric energy meter field calibrator detachable current transformer

technical field

The utility model relates to an instrument high-precision transformer used for direct current testing of a three-phase electric energy meter field calibrator. It is an external part of the three-phase electric energy meter field calibrator. The addition of this part can effectively improve the test level of the calibrator.

Background technique

At present, the three-phase electric energy meter field calibrator at home and abroad is equipped with a set of clamp current transformers for indirect measurement, but the test accuracy is low, and it can only be used for low-level electric energy meter (level 1 or level 2) testing. In order to be able to test high-grade energy meters (0.5 or 0.2), the current test circuit must be directly measured with a high-precision current transformer. A high-precision current transformer is installed inside the instrument, and each high-precision current transformer is generally relatively large in size, resulting in a large volume and heavy weight of the test instrument, which is inconvenient to carry and use. At present, there are many low-level electric energy meters (level 1 or level 2) installed on site, and clamp-type current transformers are generally used for indirect measurement during testing. In many cases, direct current transformers are not needed.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a current transformer module which can be used for direct testing of the electric energy meter field calibrator, and has the characteristics of small size, high precision and detachability. It is convenient to use in different test situations on site.

In order to solve the above technical problems, the utility model provides a detachable current transformer for a three-phase electric energy meter field calibrator, which is characterized in that it includes a detachable external current transformer module installed on the three-phase electric energy meter calibrator ; The current transformer module includes three current transformers, the primary winding ends of the three current transformers are respectively connected to a group of primary current terminals , and the secondary winding ends of the three current transformers are connected to the secondary wiring ports in total ; The secondary wiring port is electrically connected with the current measurement interface on the calibrator.

The current transformer module is positioned and connected with the calibrator through buckles.

The primary wiring port adopts a socket with a diameter of φ4.

When used on site, the current is connected to the current transformer through the primary current terminal, and then connected to the current measurement interface of the calibrator through the secondary wiring port to provide the input of the current loop test signal of the calibrator.

The beneficial effects achieved by the utility model:

The current transformer module of the utility model and the main body of the calibrator adopt an external split method, and can be used in combination with the calibrator according to needs, or can be disassembled from the calibrator to reduce the volume of the field calibrator for electric energy meters. Taking into account the measurement accuracy and the convenience of portability and use, the miniaturization and palm-type operation of the electric energy meter field calibrator are realized. The utility model can be widely used in field calibration instruments for electric energy meters.

Description of drawings

Fig. 1 is the assembly diagram of the utility model detachable current transformer module and calibrator;

Figure 2-Figure 4 is a structural diagram of the detachable current transformer module of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

The current transformer module adopts an integral design method. One current transformer module has three current transformers. The module and the main body of the current calibrator adopt an external split method. The module can be freely installed and disassembled from the calibrator. It can effectively reduce the overall volume of the on-site calibrator, and is convenient to carry and use on-site.

As shown in FIG. 1 , it is an assembly diagram of the detachable current transformer module 1 and the on-site calibrator 2, and the current transformer is a whole. The current transformer module 1 is accurately positioned and connected to the main body of the calibrator 2 through buckles, and its appearance is coordinated with the appearance of the calibrator 2 to maintain the overall appearance of the instrument.

The secondary wiring port of the current transformer module 1 is completely consistent with the appearance, structure, size and electrical definition of the secondary interface of the clamp current transformer used in testing the electric energy meter in the prior art, and the same interface is used to connect with the calibrator 2 to realize the clamp current The transformer interface and the direct transformer module interface are unified and reused.

As shown in Figure 2-Figure 4, it is a structural diagram of the detachable current transformer module 1, and three current transformers 4 are integrated and installed in a plastic shell 7 , and the three current transformers are independent A, B, C three group, using an integrated package, which can greatly reduce the volume. The current transformer module 1 has a primary current connection terminal 3 and a secondary connection port 5 . The primary current terminal 3 is divided into three groups, namely A, B, and C three phases, each group has one terminal for the high end and one low end, and the three groups have a total of 6 terminals. The primary winding terminals of the three current transformers 4 are respectively connected to a group of primary current terminals 3 , and the secondary winding terminals of the three current transformers 4 are connected to the secondary terminal 5 in common. The primary wiring port 3 adopts a jack with a diameter of φ4, which can be adapted to use the φ4 plug rod of the electric energy meter during the existing test. The secondary wiring port 5 is electrically connected with the current measurement interface on the calibrator 2 . The connection between the current transformer module 1 and the calibrator 2 is provided with a buckle 6 in cooperation, and quick disassembly is realized by the way of the buckle 6 being snapped together.

When used in the field, the current is connected to the current transformer 4 through the primary current terminal 3, and then connected to the current measurement interface of the field calibrator 2 through the secondary wiring port 5 to provide the input of the current loop test signal of the calibrator 2.

The calibrator 2 adopts the existing three-phase electric energy meter field calibrator, or the internal structure is the same as that of the existing three-phase electric energy meter field calibrator, and the interface is matched with the current transformer module 1 to realize the Energy meter testing.

When testing a low-level electric energy meter on site, the current transformer module 1 is not needed, and the calibrator 2 is used for direct measurement; while when measuring a high-level electric energy meter, the current transformer module 1 is connected to the calibrator 2 . Therefore, the volume and weight of the tester 2 are reduced, and it is more convenient to carry and use.

The above is only the preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (4)

1. A three-phase electric energy meter field calibrator detachable current transformer, is characterized in that, comprises a detachable externally installed current transformer module on the three-phase electric energy meter calibrator; Described current transformer The module contains three current transformers, the primary winding terminals of the three current transformers are respectively connected to a set of primary current terminals , and the secondary winding terminals of the three current transformers are connected to the secondary terminal; The port matches and electrically communicates with the current measurement interface on the calibrator. 2. The detachable current transformer of the three-phase electric energy meter on-site calibrator according to claim 1, wherein the current transformer module is positioned and connected to the calibrator through buckles. 3. The detachable current transformer of the three-phase electric energy meter field calibrator according to claim 1, wherein the primary connection port adopts a jack with a diameter of φ4. 4. The detachable current transformer of the three-phase electric energy meter field calibrator according to claim 1, wherein the current is connected to the current transformer through the primary current terminal when used on site, and then connected to the calibration terminal through the secondary terminal. The current measurement interface of the calibrator is connected to provide the input of the current loop test signal of the calibrator.

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