Intelligent accurate measuring device for secondary circuit of mutual inductor

Abstract

An intelligent accurate measuring device for a secondary circuit of a mutual inductor comprises a variable resistance module, one end of the variable resistance module is connected with one end of a filter circuit, the other end of the variable resistance module is connected with a first measuring terminal, and the other end of the filter circuit is connected with a second measuring terminal; the first measuring terminal and the second measuring terminal are used for connecting two meter heads of a universal meter. The current transformer secondary circuit resistance measuring device is an intelligent accurate measuring accessory matched with a universal meter to measure the secondary circuit resistance of a current transformer, has the advantages of simple structure, convenience in use, accurate measurement and the like, can effectively eliminate induced electric interference on a secondary cable, ensures the accuracy of a measurement result of the universal meter, improves the efficiency and the safety of regular checking work, and is suitable for popularization and application. Wide application prospects are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of power equipment detection, and particularly relates to an intelligent precise measurement device for the secondary circuit of an instrument transformer. Background Art

[0002] During the regular inspection and maintenance of the power system, detecting the DC resistance of the secondary circuit of a current transformer is one of the important links. Its main purpose is to check the integrity of the secondary circuit and ensure its normal operation.

[0003] When the secondary side of the current transformer is connected to a long cable or is located in an open switchyard, due to the influence of electromagnetic induction, a relatively high induced voltage may be generated on the secondary cable, resulting in the inability of the multimeter to accurately measure the DC resistance. This brings great inconvenience and potential safety hazards to the inspection work. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an intelligent precise measurement device for the secondary circuit of an instrument transformer, which is an accessory device that can eliminate the interference of induced voltage and cooperate with a multimeter for measurement. It can effectively eliminate the interference of induced voltage on the secondary cable, ensure the accuracy of the measurement result, enable accurate measurement during the regular inspection of the secondary circuit of the power system, and improve the efficiency and safety of the inspection work.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is:

[0006] An intelligent precise measurement device for the secondary circuit of an instrument transformer includes a variable resistance module. One end of the variable resistance module is connected to one end of a filter circuit, the other end of the variable resistance module is connected to a first measurement terminal, and the other end of the filter circuit is connected to a second measurement terminal; the first measurement terminal and the second measurement terminal are used to connect the two meter heads of a multimeter.

[0007] Preferably, a loop ground wire is connected between the variable resistance module and the filter circuit.

[0008] Preferably, the variable resistance module and the filter circuit are installed in a shielding enclosure. The first measurement terminal is connected to a first flexible wire, the second measurement terminal is connected to a second flexible wire, and both the first flexible wire and the second flexible wire are connected to a measurement adapter.

[0009] Preferably, the measurement adapter includes a connection base, and the connection base is electrically connected to a measurement pin; the connection base is used to be electrically connected to the meter head of a multimeter.

[0010] Preferably, a metal slot is provided in the connection base. The metal slot is electrically connected to the measurement pin and is also electrically connected to the flexible wire, and the flexible wire is the first flexible wire or the second flexible wire.

[0011] Preferably, the connection base is made of plastic.

[0012] The utility model can achieve the following beneficial effects:

[0013] The utility model is an intelligent and precise measurement accessory for measuring the resistance value of the secondary circuit of a current transformer in cooperation with a multimeter. It has the advantages of simple structure, convenient use, accurate measurement, etc. It can effectively eliminate the induced electric interference on the secondary cable, ensure the accuracy of the measurement result of the multimeter, improve the efficiency and safety of the regular inspection work, and has a wide application prospect. Description of the Drawings

[0014] The following further describes the utility model with reference to the drawings and embodiments:

[0015] Figure 1 is the circuit connection diagram of the utility model;

[0016] Figure 2 is the physical connection diagram of the utility model;

[0017] Figure 3 is the structure diagram of the measurement adapter of the utility model.

[0018] In the figure: variable resistance module 1, filter circuit 2, first measurement terminal 301, second measurement terminal 302, shielding shell 4, first flexible wire 501, second flexible wire 502, measurement adapter 6, connection seat 601, measurement needle 602, metal slot 603, multimeter 7. Detailed Embodiment

[0019] The preferred solution is as Figures 1 to 3 shown. The intelligent and precise measurement device for the secondary circuit of the transformer includes a variable resistance module 1. One end of the variable resistance module 1 is connected to one end of the filter circuit 2, the other end of the variable resistance module 1 is connected to the first measurement terminal 301, and the other end of the filter circuit 2 is connected to the second measurement terminal 302; the first measurement terminal 301 and the second measurement terminal 302 are used to connect the two meter heads of the multimeter.

[0020] Variable resistance module: used to match the resistance value of the secondary circuit and prevent the influence of induced electricity on the measurement of the multimeter.

[0021] Filter circuit: used to eliminate the high-frequency interference signals in the measurement circuit and ensure the stability of the measurement result. Due to the filter circuit and the variable resistance, the secondary resistance value of the transformer can be accurately measured.

[0022] Measurement terminal: used to connect the secondary circuit of the current transformer and the multimeter.

[0023] Shielding shell: used to shield the external electromagnetic interference and ensure the purity of the measurement environment.

[0024] Preferably, a loop ground wire is connected between the variable resistor module 1 and the filter circuit 2 to eliminate the influence of harmonics.

[0025] Preferably, the variable resistor module 1 and the filter circuit 2 are installed in a shielding enclosure 4. The first measurement terminal 301 is connected to the first flexible wire 501, and the second measurement terminal 302 is connected to the second flexible wire 502. Both the first flexible wire 501 and the second flexible wire 502 are connected to the measurement adapter 6.

[0026] The design purpose of the measurement adapter 6 is to reduce the wire connection time. Since the first measurement terminal 301 and the second measurement terminal 302 need to be connected to the two meter heads of the multimeter, and at the same time the two meter heads need to be connected to the object under test, therefore, the measurement adapter 6 is designed to quickly connect to both ends of the DC resistance of the secondary circuit of the current transformer.

[0027] Specifically, the measurement adapter 6 includes a connection base 601, and the connection base 601 is electrically connected to the measurement needle 602; the connection base 601 is used to be electrically connected to the meter head of the multimeter. A metal slot 603 is provided in the connection base 601. The metal slot 603 is electrically connected to the measurement needle 602, and the metal slot 603 is electrically connected to the flexible wire. The flexible wire is the first flexible wire 501 or the second flexible wire 502. The connection base 601 is made of plastic.

[0028] The meter head of the multimeter is inserted into the metal slot 603 and is connected to the measurement needle 602 at the same time. In this way, the measurement needle 602 replaces the function of the original meter head of the multimeter.

[0029] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. Intelligent and precise measurement device for the secondary circuit of a transformer, characterized in that: It includes a variable resistor module (1). One end of the variable resistor module (1) is connected to one end of a filter circuit (2), the other end of the variable resistor module (1) is connected to a first measurement terminal (301), and the other end of the filter circuit (2) is connected to a second measurement terminal (302); the first measurement terminal (301) and the second measurement terminal (302) are used to connect to the two meter heads of a multimeter.

2. The intelligent and precise measurement device for the secondary circuit of the instrument transformer according to claim 1, wherein: A loop ground wire is connected between the variable resistor module (1) and the filter circuit (2).

3. The intelligent and precise measurement device for the secondary circuit of the instrument transformer according to claim 1, wherein: The variable resistor module (1) and the filter circuit (2) are installed in a shielding enclosure (4). The first measurement terminal (301) is connected to a first flexible wire (501), the second measurement terminal (302) is connected to a second flexible wire (502), and both the first flexible wire (501) and the second flexible wire (502) are connected to a measurement adapter (6).

4. The intelligent and precise measurement device for the secondary circuit of the instrument transformer according to claim 3, characterized in that: The measurement adapter (6) includes a connection base (601), and the connection base (601) is electrically connected to a measurement needle (602); the connection base (601) is used to be electrically connected to the meter head of a multimeter.

5. The intelligent and precise measurement device for the secondary circuit of the mutual inductor according to claim 4, characterized in that: A metal slot (603) is provided in the connection base (601). The metal slot (603) is electrically connected to the measurement needle (602) and is also electrically connected to a flexible wire, and the flexible wire is the first flexible wire (501) or the second flexible wire (502).

6. The intelligent and precise measurement device for the secondary circuit of the mutual inductor according to claim 4, characterized in that: The connection base (601) is made of plastic.

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