CN217007653U - Small-size current transformer tester - Google Patents

Abstract

The utility model belongs to the technical field of polarity and transformation ratio testing of a current transformer, and particularly relates to a small-sized current transformer tester. The utility model comprises an insulating shell, wherein a power supply generating switch, a current control switch, a current regulating switch, a primary current test meter, a first secondary current test meter, a second secondary current test meter and a third secondary current test meter are arranged on the outer surface of the insulating shell; a current output terminal post group, a first measuring terminal post group, a second measuring terminal post group and a third measuring terminal post group are arranged at the upper part of the insulating shell; a power supply module is arranged in the insulating shell; the insulating shell comprises a power output loop and a current testing loop. The utility model has the characteristics of simple, reasonable and compact structure, convenient carrying, convenient and flexible use, simple and convenient test process and high efficiency, is suitable for various current transformers with different transformation ratios, can simultaneously measure three windings, reduces the test workload, saves the test time and is suitable for popularization and application.

Description

A small current transformer tester

technical field

The utility model belongs to the technical field of current transformer polarity and transformation ratio testing, in particular to a small current transformer tester.

Background technique

Current transformer is an important electrical equipment in the power system, and it is of great significance to the normal operation of protection, measurement, metering and other equipment in the power system. The current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side according to the principle of electromagnetic induction. It will affect the measurement, metering and other functions of electricity such as current and power in the power system.

In the electrical commissioning stage, the secondary circuit inspection of the current transformer is an important commissioning content. Generally, multimeters, transformer characteristic testers, etc. are mostly used in the secondary circuit inspection of current transformers. The transformer characteristic tester is generally used for the routine test of the polarity and transformation ratio of the current transformer. The equipment is cumbersome to operate and is not suitable for the debugging and verification stage. The method of voltmeter testing mainly has problems such as many tools, complicated wiring, and the need for coordination and cooperation of many people.

Utility model content

Aiming at the deficiencies in the above-mentioned prior art, the utility model provides a small current transformer tester. The purpose of the utility model is to effectively solve the problems of many tools, complicated wiring, time-consuming, labor-intensive and low-efficiency problems existing in the method for testing the polarity of the voltmeter.

The technical scheme that the utility model adopts for realizing the above-mentioned purpose is:

A small current transformer tester, comprising an insulating shell, a power generating switch, a current control switch, a current regulating switch, a primary current testing meter, a primary and secondary current testing meter, The second secondary current test meter and the third secondary current test meter; the upper part of the insulating shell is provided with a current output terminal group, a first measurement terminal group, a second measurement terminal group and a third measurement terminal group group; the power module is installed inside the insulating shell.

Further, the power output loop is connected in series by a power module, a power generation switch, a current control switch, a current adjustment switch, a primary current test meter, and a current output terminal group.

Further, the current test loop is connected in series by the first secondary current test meter and the first measurement terminal group; the second secondary current test meter is connected in series with the second measurement terminal group and the third secondary current The test meter is connected in series with the third set of measurement terminals.

Further, the first measurement terminal group is a current input terminal.

Further, a universal wheel is also connected to the bottom of the insulating housing.

Further, the current output terminal group is connected with the primary side of the tested current transformer through the DC output cable, and is used to output the test current, so that the current of the current transformer and the portable current transformer polarity and transformation ratio integrated tester can be measured. The output loop forms a complete loop.

Further, the first measurement terminal group is connected to the secondary side of the current transformer under test through a DC input cable, for input current measurement, and when the current output terminal sends a current pulse to the primary side of the current transformer. , The DC input cable sends the secondary current of the current transformer into the secondary current test meter, and records the maximum value of the current sent from the primary side of the current transformer and the maximum value of the secondary measurement current through the highest indicator needle to analyze the measured current. The polarity and transformation ratio of the transformer.

The utility model has the following beneficial effects and advantages:

The utility model is simple in structure, reasonable and compact, convenient to carry, convenient and flexible to use, can adjust the magnitude of the current used in the test through the sliding varistor, and is suitable for various current transformers with different transformation ratios. The maximum current at power-on can be clearly recorded through the highest pointer of the ammeter, and the transformation ratio of the current transformer can be roughly calculated through the maximum current; the measurement can be performed with one hand by using the rotary hold button, and the rotation of the hold button can free the test personnel for a long time when needed. Press the test button. Through the primary current output and secondary current input test, the test of polarity and transformation ratio is completed at the same time, which avoids the inconvenience of the tester using the traditional test method and dragging a long test line for multiple people to measure.

The utility model is easy to install, does not need an external power supply, and can be tested only through simple wiring, simplifies the test process, and can significantly improve the test efficiency. The utility model can also measure three windings at the same time, reduce the test workload, save the test time, and is suitable for popularization and application.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the test principle circuit schematic diagram of the utility model;

Fig. 2 is the three-dimensional structure schematic diagram of the utility model;

3 is a schematic diagram of the wiring diagram of the secondary circuit of the current transformer in the embodiment of the present invention.

In the picture:

Insulation case 1, power generation switch 2, current adjustment switch 3, current control switch 4, primary current test meter 5, first secondary current test meter 6, second secondary current test meter 7, third and second current test meter Secondary current test meter 8, current output terminal group 9, first measurement terminal group 10, second measurement terminal group 11, third measurement terminal group 12, highest indicating needle 13, DC output cable 14, DC input Cable 15, Current Transformer 16, Power Module 17.

Detailed ways

In order to be able to understand the above-mentioned objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other in the case of no conflict.

In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the following Limitations of the specific embodiments disclosed. For the convenience of description, the description of the relative positional relationship of each component is described according to the layout methods of Figures 1, 2, and 3 of the specification. Determined according to the layout direction of the drawings in the description.

The technical solutions of some embodiments of the present invention will be described below with reference to FIGS. 1-3 .

Example 1

The utility model is a small current transformer tester, as shown in Fig. 1-Fig. 2, Fig. 1 is a schematic diagram of the test principle circuit of the utility model. As shown in FIG. 2, FIG. 2 is a schematic diagram of the three-dimensional structure of the present invention.

The utility model is a small current transformer tester, comprising an insulating shell 1, a power generating switch 2, a current control switch 4, a current regulating switch 3, a primary current testing meter 5, a first secondary current testing meter 6, The second secondary current test meter 7 and the third secondary current test meter 8 are constituted. Specifically, a power generation switch 2, a current control switch 4, a current adjustment switch 3, a primary current test meter 5, a first secondary current test meter 6, a second secondary current test meter are provided on the outer surface of the insulating shell 1 Meter 7 and the third secondary current test meter 8.

The tester of the utility model is provided with a current output terminal group 9 , a first measurement terminal group 10 , a second measurement terminal group 11 , and a third measurement terminal group 12 on the upper part of the insulating housing 1 .

A power module 17 is installed inside the insulating housing 1 to provide test power for the device.

Among them, the power output loop is connected in series by the power module 17, the power generation switch 2, the current control switch 4, the current adjustment switch 3, the primary current test meter 5, and the current output terminal group 9; the current test loop is composed of the first two The secondary current test meter 6 is connected in series with the first measurement terminal group 10; the second secondary current test meter 7 is connected in series with the second measurement terminal group 11, and the third secondary current test meter 8 is connected with the third measurement The terminal groups 12 are connected in series.

In the specific implementation of a small current transformer tester of the present invention, as shown in FIG. 3 , FIG. 3 is a schematic diagram of the secondary circuit wiring of the current transformer in the embodiment of the present invention.

The current output terminal group 9 described in the present utility model is connected to the primary side of the current transformer 16 under test through the DC output cable 14 to output the test current, so that the current transformer 16 is connected to the portable current transformer of the present utility model. The current output loop of the polarity and transformation ratio integrated tester forms a complete loop, and the appropriate current adjustment switch position can be selected according to the different transformation ratios of the current transformers.

The first measurement terminal group 10 is a current input terminal. The first measurement terminal group 10 is connected to the secondary side of the current transformer 16 under test through the DC input cable 15 for input current measurement, and the current output terminal group 9 sends out to the primary side of the current transformer 16. During the current pulse, the DC input cable 15 sends the secondary current of the current transformer 16 into the secondary current test meter 10, and records the maximum value of the primary side current of the current transformer 16 and the maximum value of the secondary measurement current through the highest indicator needle 13. The value measurement data analyzes the polarity and transformation ratio of the current transformer under test.

Example 2

The utility model is a small current transformer tester. Four universal wheels are also connected to the bottom of the insulating housing 1. Such a design is convenient for moving and avoids the tester using the traditional test method to drag a long The inconvenience of multiple people taking measurements on the test line. The convenience of measurement is increased, the workload of inspection personnel is reduced, and the inspection work efficiency is greatly improved.

Example 3

The utility model also provides an embodiment, which is a small current transformer tester. When the utility model is used for testing, the test can be performed by pressing the manual test button, and the test results can be obtained at one time. A person can complete the test. The utility model can calculate the polarity and transformation ratio of the current transformer through the output and input current values, and realizes an integrated instrument that completes current output, current measurement, polarity test and transformation ratio test at the same time. The utility model changes the output current through the current adjustment switch, which can act on the current transformer test of various transformation ratios, and realizes the use of multiple current transformers in one instrument; the utility model also measures at most three groups of windings at the same time, which can reduce the test workload , saving testing time.

During specific implementation, the operational process of using the tester of the present utility model to test is as follows:

Step 1. Connect one end of the DC output cable 14 to the positive pole of the current output terminal group 9, and insert the other end of the DC output cable 14 from the primary side of the current transformer P1. After penetration, the number of winding turns can be selected according to the direction. Then connect to the negative side of the current output terminal group 9.

Step 2. Use the DC input cable 15 to connect the positive pole of the first measurement terminal group 10 to the S1 terminal of the current transformer 16, and use the DC input cable 15 to connect the negative pole of the first measurement terminal group 10 to the current transformer 16. S2 terminal is connected.

Step 3. The tester turns on the power generation switch 2, uses the current adjustment switch 3 to select the test current, and presses the current control switch 4 to send a pulse current to the primary side of the current transformer.

Step 4. The tester judges the polarity and transformation ratio of the current transformer 16 under test by observing the pointer indications of the primary current test meter 5 and the first and secondary current test meters 6 .

Step 5. If the needle of the first secondary current test meter 6 swings in the positive direction for the first time, it can be judged that the secondary polarity is positive; Secondary polarity is subtractive polarity.

Step 6. If the highest indicator needle 13 of the primary current test meter 5 stays at 35mA, the primary output cable is wound for 10 turns, and the highest indicator needle of the first and secondary current test meter 6 stays at 210μA, the current transformer transformation ratio can be judged About 1600/1 or 8000/5.

In the present invention, the terms "first" and "second" are only used for the purpose of description, and should not be construed as indicating or implying relative importance. The terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of the present invention, it should be understood that the indicated azimuth or positional relationship is based on the azimuth or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying what is indicated. The device or unit must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation of the present invention.

In the description of this specification, description of the terms "one embodiment", "some embodiments", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention or in the example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, this The utility model will also have various changes and improvements, which all fall within the scope of the claimed invention.

Claims (7)

1. A small current transformer tester, comprising an insulating housing (1), characterized in that: a power generating switch (2), a current control switch (4), a current Adjustment switch (3), primary current test meter (5), first secondary current test meter (6), second secondary current test meter (7) and third secondary current test meter (8) ;A current output terminal group (9), a first measurement terminal group (10), a second measurement terminal group (11) and a third measurement terminal group (12) are arranged on the upper part of the insulating housing (1); A power supply module (17) is installed inside the insulating casing (1); the insulating casing (1) includes a power output circuit and a current testing circuit. 2. A small current transformer tester according to claim 1, characterized in that: the power output loop is composed of a power module (17), a power generation switch (2), a current control switch (4), a current regulator The switch (3), the primary current test meter (5), and the current output terminal group (9) are connected in series. 3. A small current transformer tester according to claim 1, characterized in that: the current test loop is connected in series by the first secondary current test meter (6) and the first measurement terminal group (10). Connection; the second secondary current test meter (7) is connected in series with the second measurement terminal group (11) and the third secondary current test meter (8) is connected in series with the third measurement terminal group (12). 4 . The small current transformer tester according to claim 1 , wherein the first measurement terminal group ( 10 ) is a current input terminal. 5 . 5 . The small-sized current transformer tester according to claim 1 , wherein the bottom of the insulating housing ( 1 ) is further connected with a universal wheel. 6 . 6. A small current transformer tester according to claim 1, characterized in that: the current output terminal group (9) is connected to the tested current transformer (16) once through the DC output cable (14). The side connection is used to output the test current, so that the current transformer (16) and the current output loop of the portable current transformer polarity and transformation ratio integrated tester form a complete loop. 7. A small current transformer tester according to claim 1, characterized in that: the first measurement terminal group (10) is connected to the current transformer (16) under test through a DC input cable (15). The secondary side connection is used for input current measurement and when the current output terminal group (9) sends a current pulse to the primary side of the current transformer (16), the DC input cable (15) connects the current transformer (16) The secondary current is sent to the secondary current test meter (6), and the maximum value of the current emitted by the primary side of the current transformer (16) and the maximum value of the secondary measured current are recorded through the highest indicator needle (13), and the measured data is analyzed to analyze the measured current The polarity and transformation ratio of the transformer.

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