CN212083636U - A self-powered transformer secondary circuit detection device - Google Patents

Abstract

The utility model discloses a secondary circuit detection device of a self-powered transformer, comprising a control unit, an inverter unit, a filter unit, an output relay I, a power supply unit, a direct current boosting unit and an output relay II. The control units are respectively It is electrically connected with the DC boosting unit and the inverter unit, the filtering unit is electrically connected with the output relay I, the DC boosting unit is electrically connected with the output relay II, and both the output relay I and the output relay II are electrically connected with the output relay II. The control unit is electrically connected, and the utility model supplies power to the device through the battery carried by itself, which gets rid of the limitation that the device needs an external power supply, and can inject direct current and alternating current into the secondary circuit at the same time, and the secondary circuit can be realized by only one wiring. The functions of current/voltage inspection, one-point grounding detection and insulation detection are more convenient to convert, which reduces the tedious operation steps of the original detection method of the secondary circuit of the transformer, and improves the detection efficiency.

Description

A self-powered transformer secondary circuit detection device

technical field

The utility model relates to the technical field of electrical devices, in particular to a secondary circuit detection device of a self-powered transformer.

Background technique

In the prior art, a relay protection tester is used to pass current/voltage from the secondary circuit of the transformer to detect the current/voltage conditions of each connection point in the circuit, and then an insulation resistance tester is used to detect the grounding condition and insulation condition of one point of the secondary circuit. , to judge whether there is a fault in the secondary circuit. This detection method has the following problems: 1. The operation is relatively cumbersome, and it is necessary to replace different testing equipment and wiring methods. Some on-site testing staff will selectively carry out work in order to save trouble. 2. The relay protection tester needs an external power supply, which is relatively bulky, which brings certain difficulties to the detection work, and often delays a lot of working time for selecting a reliable power supply.

The purpose of the utility model is to design a self-powered transformer secondary circuit detection device that is simple to operate, portable and capable of providing detection current and voltage.

Utility model content

The purpose of the present invention is to provide a self-powered transformer secondary circuit detection device to solve the problems raised in the above background technology.

To achieve the above object, the utility model provides the following technical solutions:

A self-powered transformer secondary circuit detection device, comprising a control unit, an inverter unit, a filter unit, an output relay I, a power supply unit, a DC boost unit and an output relay II, the control unit is respectively connected with the DC boost unit. It is electrically connected to the inverter unit, the inverter unit is electrically connected to the filter unit, the filter unit is electrically connected to the output relay I, the DC boost unit is electrically connected to the output relay II, and the output relay Both I and output relay II are electrically connected to the control unit.

Preferably, the output end of the filtering unit is electrically connected to the control unit through the protection unit.

Preferably, the power supply unit is a battery, and the power supply unit supplies power through an external charging unit.

Preferably, the three-way output voltage controlled by the output relay I is 0-70V, the output three-way current is 0-5A, and the output DC voltage controlled by the output relay II is 500-1000V.

Compared with the prior art, the beneficial effects of the present utility model are:

1. The utility model supplies power to the device through the battery carried by itself, which gets rid of the limitation that the device needs an external power supply to supply power, can still be used normally in the scene where the selection of AC power is difficult, and improves the efficiency of detection;

2. The utility model outputs direct current and alternating current through the direct current boosting unit and the inverter unit, which can conveniently complete the switching of direct current and alternating current, and can complete the current, voltage, and secondary circuits of the transformer secondary circuit with only one connection. The detection work of load, one-point grounding, insulation resistance, etc., reduces the tedious operation steps of the secondary circuit detection of the transformer, and improves the detection efficiency;

The utility model supplies power to the device through the self-carrying storage battery, which gets rid of the limitation that the device needs an external power supply to supply power, and at the same time can inject direct current and alternating current into the secondary circuit, the conversion is more convenient, and the tediousness of one-point grounding of the secondary circuit of the transformer is reduced. Operation steps to improve detection efficiency.

Description of drawings

FIG. 1 is a block diagram of the overall system structure of the present invention.

In the figure: 1 control unit, 2 inverter unit, 3 filter unit, 4 output relay I, 5 power supply unit, 6 DC boost unit, 7 output relay II, 8 protection unit.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to Fig. 1, the utility model provides a kind of technical scheme:

A self-powered transformer secondary circuit detection device, comprising a control unit 1, an inverter unit 2, a filter unit 3, an output relay I4, a power supply unit 5, a DC boost unit 6 and an output relay II7, the control unit 1 and the output relay II7 are respectively connected. The DC boost unit 6 is electrically connected to the inverter unit 2, the inverter unit 2 is electrically connected to the filter unit 3, the filter unit 3 is electrically connected to the output relay I4, the DC boost unit 6 is electrically connected to the output relay II7, Both the output relay I4 and the output relay II7 are electrically connected to the control unit 1 .

The control unit 1 is a single-chip microcomputer, which controls and coordinates various electrical components through the single-chip microcomputer. The inverter unit 2 is an inverter, which converts the direct current into alternating current through the inverter. The filter unit 3 is a filter. The signal of the specific frequency of the current output by the inverter is filtered to obtain a specific power supply signal. The output relay I4 and the output relay II7 are used to adjust the output voltage and current, and the output relay I4 and the output relay II7 are adjusted by the control device 1.

As a preference, the output end of the filter unit 3 is electrically connected to the control unit 1 through the protection unit 9, and the protection unit 9 protects the voltage and current output by the filter unit 3. The protection unit 9 in this embodiment is Hunan Xianghui Electric Co., Ltd. The DZ47L-63 type overvoltage protector produced.

As a preferred example, the power supply unit 5 is a battery, and the power supply unit 5 supplies power through an external charging unit.

As a preference, the output voltage of one channel controlled by the output relay I4 is 1-130V, the output current of the three channels is 0-5A, and the DC voltage controlled by the output relay II7 is 500-1000V.

Working principle: Connect the external lead of the device to the root/terminal block of the secondary circuit of the transformer, remove the grounding wire at one point of the secondary circuit, and adjust the output relay I4 through the control unit 1 to input the set voltage and current in the secondary circuit , It is used to check the goodness of the secondary circuit. After the detection, there is no need to replace the wiring. The output relay II7 can be switched by one key of the control unit 1. The set DC 500V/1000V voltage is input into the secondary circuit, and the secondary circuit is detected by a high-precision ammeter. The ground current is calculated and judged by the control unit, the insulation resistance of the secondary circuit to the ground is calculated, and it is judged whether there is a multi-point grounding situation in the secondary circuit.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. A self-powered transformer secondary circuit detection device, comprising a control unit (1), an inverter unit (2), a filter unit (3), an output relay I (4), a power supply unit (5), a DC booster The voltage unit (6) and the output relay II (7) are characterized in that: the control unit (1) is electrically connected to the DC boost unit (6) and the inverter unit (2) respectively, and the inverter unit ( 2) It is electrically connected with the filtering unit (3), the filtering unit (3) is electrically connected with the output relay I (4), and the DC boosting unit (6) is electrically connected with the output relay II (7), Both the output relay I (4) and the output relay II (7) are electrically connected with the control unit (1). 2. A self-powered transformer secondary loop detection device according to claim 1, characterized in that: the output end of the filtering unit (3) is electrically connected to the control unit (1) through the protection unit (8) connect. 3. A self-powered transformer secondary circuit detection device according to claim 1, characterized in that: the power supply unit (5) is a battery, and the power supply unit (5) supplies power through an external charging unit. 4. A self-powered transformer secondary circuit detection device according to claim 1, characterized in that: one output voltage controlled by the output relay I (4) is 1-130V, and the output three currents are 0-5A, the output DC voltage controlled by the output relay II (7) is 500-1000V.

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