CN213302501U

CN213302501U - Polarity transformation ratio testing device for current transformer

Info

Publication number: CN213302501U
Application number: CN202022187905.8U
Authority: CN
Inventors: 卢超龙; 林海珠; 卢国龙; 陈冬华; 桂天雨
Original assignee: Xiamen Guiyi Technology Co ltd
Current assignee: Xiamen Guiyi Technology Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-05-28
Anticipated expiration: 2030-09-29

Abstract

The utility model provides a current transformer polarity transformation ratio testing arrangement belongs to electrical detection check-up technical field, including current transformer, electric quantity collection module, control system, electric quantity collection module has voltage collection end, current collection end and the signal output part who is connected with control system, current transformer's once side connect in the voltage collection end, current transformer's secondary side connect in the current collection end, the utility model discloses but have automatic completion polarity and judge, need not the microampere table of electric current, can improve detection efficiency and equipment life.

Description

Polarity transformation ratio testing device for current transformer

Technical Field

The utility model relates to an electrical detection calibration technical field, especially a current transformer polarity transformation ratio testing arrangement.

Background

The polarity test of the current transformer is required before and after handover and overhaul, so that the polarity test is required before commissioning, because the polarity test is carried out to prevent the wrong polarity during wiring, the wrong action of a protection device is caused on a relay protection circuit and a metering circuit, and the measurement cannot be carried out correctly.

The traditional polarity measurement principle of the current transformer comprises an alternating current injection method, a direct current power supply method and a main transformer primary through-flow method, but the method has the following problems in practical application: firstly, the existing portable current transformer polarity measuring device can only carry out single-phase or three-phase current transformer polarity measurement; and in addition, the secondary circuit virtual connection or the damage of a terminal block or the damage of a current microammeter can be easily caused by frequently plugging and unplugging the test wiring.

In view of the above, the present inventors have specially designed a polarity transformation ratio testing apparatus for a current transformer, and have resulted from this.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the technical scheme of the utility model is as follows:

the utility model provides a current transformer polarity transformation ratio testing arrangement, includes current transformer, electric quantity collection module, control system, and electric quantity collection module has voltage collection end, current collection end and the signal output part who is connected with control system, and current transformer's once side is connected in voltage collection end, and current transformer's secondary side is connected in current collection end.

Preferably, the system further comprises a zero sequence transformer and an electric quantity acquisition module electrically connected with the zero sequence transformer, and signal ends of the two electric quantity acquisition modules are in short circuit with each other and are electrically connected with the control system.

Preferably, the control system comprises a PLC and a communication module for the PLC to interact with the signal output end.

Preferably, the communication module is FX3U-485BD, and the communication module includes an RDA end, an RDB end, an SDA end, an SDB end, and an SG end, wherein a protection resistor is connected in series between the RDA end and an external circuit of the RDB end, the RDA end is in short circuit with the SDA end, and the SDB end is in short circuit with the SDB end.

Preferably, the protective resistor has a resistance of 120 ohms.

Preferably, the PLC is of the type FX3U-128 MR.

Preferably, the model of the electric quantity acquisition module is HC-33A.

The utility model discloses have electric quantity collection module and control system who is connected with current transformer, control system includes PLC and is used for with the interactive communication module of PLC and electric quantity collection module, electric quantity collection module gathers the voltage that current transformer once inclines, the electric current of secondary side respectively, pass electric current and voltage signal to PLC again, finally utilize the power law to carry out the calculation of power factor angle, if reactive power is positive number, then show that current transformer is positive polarity, if reactive power is the negative number, then show that current transformer is the negative polarity.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it.

Wherein:

fig. 1 is a secondary side wiring diagram of the current transformer and the zero sequence transformer of the present invention;

FIG. 2 is a wiring diagram of the highlighted power acquisition module of the present invention;

FIG. 3 is a wiring diagram of the communication module according to the present invention;

fig. 4 is an electrical schematic diagram of the present invention.

Description of reference numerals:

1. a current transformer; 2. an electric quantity acquisition module; 21. a voltage collection terminal; 22. a current collection terminal; 23. a signal output terminal; 3. a control system; 31. a PLC; 32. a communication module; 33. a protection resistor; 4. a zero sequence transformer.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention clearer and more obvious, the following description of the present invention with reference to the accompanying drawings and embodiments is provided for further details. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 to 4, a polarity ratio testing apparatus for a current transformer according to a preferred embodiment of the present invention is shown,

the intelligent power consumption monitoring system comprises a current transformer 1, an electric quantity acquisition module 2 and a control system 3, wherein the model of the electric quantity acquisition module 2 is HC-33A, the electric quantity acquisition module is marked as HC-33A-1, the electric quantity acquisition module 2 is provided with a voltage acquisition end 21, a current acquisition end 22 and a signal output end 23 connected with the control system 3, the voltage acquisition end 21 is arranged at the top of the electric quantity acquisition module 2 and is provided with three ports of Ua, Ub and Uc; the current collection end is arranged in the middle of the electric quantity collection module 2 and is provided with a hole A, a hole B and a hole C; the signal output end 23 is arranged at the bottom of the electric quantity acquisition module 2 and is provided with an A + port and a B-port for inputting a direct-current power supply V + and a GDD and transmitting signals; the primary side of the current transformer 1 is connected to the voltage collecting terminal 21, and the secondary side of the current transformer 1 is connected to the current collecting terminal 22, specifically, the secondary side of the current transformer 1 is electrically connected to the hole a and the hole C of the HC-33A-1, respectively.

As shown in fig. 1-2, the system further comprises a zero sequence transformer 4 and an electric quantity collecting module 2 electrically connected with the zero sequence transformer 4, the electric quantity collecting module 2 is labeled as No. HC-33A-2, similarly, a primary side of the zero sequence transformer 4 is connected with a voltage collecting terminal 21 of the electric quantity collecting module 2, a secondary side of the zero sequence transformer 4 is connected with a current collecting terminal 22 of the electric quantity collecting module 2, specifically, a secondary side of the zero sequence transformer 4 is electrically connected with a hole B and a hole C of the HC-33A-2, signal terminals of the two electric quantity collecting modules 2 are in short circuit with each other and are electrically connected with the control system 3, i.e. a port V + and a port GDD of the HC-33A-1, a port a + and a port B-are respectively in short circuit with a port V + and a GDD of the HC-33A-2, and a port B-B, when the leakage occurs, the power supply of the main circuit can be cut off, thereby protecting the personal safety.

As shown in fig. 3, the control system 3 includes a PLC31 and a communication module 32 for interaction between the PLC31 and the signal output terminal 23, wherein the PLC31 has a model of FX3U-128MR, the communication module 32 has a model of FX3U-485BD, the communication module 32 includes an RDA terminal, an RDB terminal, an SDA terminal, an SDB terminal, and an SG terminal, a protection resistor 33 is connected in series between the RDA terminal and the external circuit of the RDB terminal, the RDA terminal is shorted with the SDA terminal, the SDB terminal is shorted with the SDB terminal, and the protection resistor 33 has a resistance of 120 ohms and functions as a current reduction protection circuit.

As shown in fig. 4, the circuit schematic diagram of the present invention is as follows:

the primary side of the current transformer 1 is electrically connected with the voltage collecting end 21 of the electric quantity collecting module 2, the secondary side of the current transformer 1 is electrically connected with the electric quantity collecting end of the electric quantity collecting module 2, then the signal output end 23 of the electric quantity collecting module 2 transmits the voltage and current signals to the communication module 32, the communication module 32 converts the voltage and current analog signals of the electric quantity collecting module 2 into digital signals which can be processed by the PLC31, and the power factor angle is judged, if the reactive power is positive, the current transformer 1 is positive, and if the reactive power is negative, the current transformer 1 is negative.

The utility model discloses have electric quantity collection module 2 and control system 3 of being connected with current transformer 1, control system 3 includes PLC31 and is used for with PLC31 and the interactive communication module 32 of electric quantity collection module 2, electric quantity collection module 2 gathers the voltage that current transformer 1 once inclines respectively, the electric current of secondary side, pass electric current and voltage signal to PLC31 again, finally, the power law of application carries out the calculation of power factor angle, if reactive power is the positive number, then show that current transformer 1 is positive polarity, if reactive power is the negative number, then show that current transformer 1 is the negative polarity.

To sum up, the utility model discloses but have the automatic polarity of accomplishing and judge, need not electric current microampere table, can improve detection efficiency and equipment life.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, and various insubstantial improvements can be made without modification to the method and technical solution of the present invention, or the present invention can be directly applied to other occasions without modification, all within the scope of the present invention.

Claims

1. The polarity transformation ratio testing device for the current transformer is characterized by comprising the current transformer (1), an electric quantity acquisition module (2) and a control system (3), wherein the electric quantity acquisition module (2) is provided with a voltage collection end (21), a current collection end (22) and a signal output end (23) connected with the control system (3), the primary side of the current transformer (1) is connected to the voltage collection end (21), and the secondary side of the current transformer (1) is connected to the current collection end (22).

2. The polarity transformation ratio testing device of the current transformer according to claim 1, further comprising a zero sequence transformer (4) and electric quantity collection modules (2) electrically connected with the zero sequence transformer (4), wherein signal ends of the two electric quantity collection modules (2) are short-circuited with each other and are electrically connected with the control system (3).

3. The current transformer polarity ratio testing device according to claim 1, wherein the control system (3) comprises a PLC (31) and a communication module (32) for the PLC (31) to interact with the signal output terminal (23).

4. The polarity ratio testing device of claim 3, wherein the communication module (32) is FX3U-485BD, and the communication module (32) comprises an RDA end, an RDB end, an SDA end, an SDB end and an SG end, wherein a protection resistor (33) is connected in series with an external circuit of the RDA end and the RDB end, the RDA end is in short circuit with the SDA end, and the SDB end is in short circuit with the SDB end.

5. The polarity ratio testing device of the current transformer according to claim 4, wherein the protection resistor (33) has a resistance of 120 ohms.

6. A current transformer polarity ratio testing arrangement as claimed in claim 3, wherein said PLC (31) is of the type FX3U-128 MR.

7. The polarity transformation ratio testing device of the current transformer according to any one of claims 1 to 6, wherein the model of the electric quantity acquisition module (2) is HC-33A.