Fault detection system

Abstract

The utility model discloses a fault detection system, relates to the transformer field, including transformer, detection box and power supply unit, transformer is electrically connected with detection box, the detection box is electrically connected with power supply unit, the detection box includes conveying unit and processing unit, the conveying unit is electrically connected with the power supply unit, and the processing unit is electrically connected with the transformer. And the conveying unit is electrically connected with the processing unit. According to the utility model, through cooperation between the conveying unit and the processing unit, a worker can simultaneously carry out a synchronous experiment on three phases of the transformer when carrying out a characteristic test on the three-phase transformer, so that the experiment time of the three-phase transformer is shortened, and volt-ampere characteristic curve and withstand voltage test can be carried out on the three-phase transformer; extra equipment is not needed to carry out experiment operation on the three-phase transformer, so that a worker can carry out operation better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of transformer, especially a fault detection system. BACKGROUND

[0002] The transformer characteristic tester is a kind of electric power system measuring equipment, mainly used to test and verify transformer in electric power system.It can measure the withstand voltage, transformation ratio, excitation curve and other parameters of transformer, and provides important technical support for reliable operation of electric power system.

[0003] However, in the market, we find that the existing equipment is mainly used for detailed parameter test on the characteristics of transformer, and these tests are mainly used in the factory stage, and the operation process is relatively complicated, and higher professional skills are required.However, for front-line staff, what they need most is actually to quickly and conveniently judge the characteristics of transformer.The equipment on the market is not designed specifically for the convenience of front-line staff to overhaul, and each test can only determine one phase, if it is a three-phase transformer, each phase needs to be tested separately, so the operation becomes very complex;At the same time, special equipment box is needed for the voltage-current characteristic curve and withstand voltage test of transformer, and different equipment needs to be used for different tests, which is very high for front-line staff. SUMMARY

[0004] This part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments.In this part and the abstract of the specification and the utility model name of the application, some simplification or omission may be made to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplification or omission cannot be used to limit the scope of the utility model.

[0005] Therefore, the problem to be solved by the utility model is that the existing tester cannot test three phases of three-phase transformer at the same time, and multiple equipment boxes need to be prepared for the voltage-current characteristic curve and withstand voltage test of transformer.

[0006] To solve the above technical problems, the utility model provides the following technical scheme: a fault detection system, comprising a detection box, the inside of the detection box includes conveying unit and processing unit, the conveying unit and processing unit are electrically connected, the conveying unit and transformer are electrically connected, the conveying unit and the processing unit are electrically connected with power supply unit.

[0007] Among them, the transformer includes primary side, secondary side and step-down unit, the secondary side and the step-down unit are electrically connected.

[0008] As the preferred scheme of the fault detection system, the conveying unit comprises a first fuse, and the first fuse is electrically connected with the power supply unit.

[0009] As the preferred scheme of the fault detection system, the first fuse and the first air switch are connected in parallel, the first air switch is electrically connected with a voltage booster, the voltage booster is electrically connected with a filter, the filter is electrically connected with an inverter unit, the inverter unit is electrically connected with a second fuse, and the second fuse is connected in parallel with a second air switch.

[0010] As the preferred scheme of the fault detection system, the voltage booster comprises a first switch tube and a second switch tube, the first switch tube is electrically connected with a primary side, and the first switch tube is electrically connected with the processing unit.

[0011] As the preferred scheme of the fault detection system, the processing unit is electrically connected with the second switch tube, and the second switch tube is electrically connected with the secondary side.

[0012] As the preferred scheme of the fault detection system, the voltage booster comprises a first switch tube and a second switch tube, the first switch tube is electrically connected with a primary side, and the first switch tube is electrically connected with the processing unit.

[0013] As the preferred scheme of the fault detection system, the voltage booster comprises a first switch tube and a second switch tube, the first switch tube is electrically connected with a primary side, and the first switch tube is electrically connected with the processing unit.

[0014] As the preferred scheme of the fault detection system, the voltage booster comprises a first switch tube and a second switch tube, the first switch tube is electrically connected with a primary side, and the first switch tube is electrically connected with the processing unit.

[0015] As the preferred scheme of the fault detection system, the voltage booster comprises a first switch tube and a second switch tube, the first switch tube is electrically connected with a primary side, and the first switch tube is electrically connected with the processing unit.

[0016] The fault detection system has the advantages that the cooperation between the conveying unit and the processing unit enables the staff to simultaneously perform synchronous experiments on the three phases of the transformer during the characteristic test of the three-phase transformer, the experiment time of the three-phase transformer is shortened, the voltage-current characteristic curve and the withstand voltage test can be performed on the three-phase transformer, the additional equipment is not needed for the experiment operation of the three-phase transformer, and the staff can better perform the operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 A schematic diagram of the overall principle of the test in the fault detection system provided in the embodiments of this utility model;

[0019] Figure 2 A schematic diagram of the principle of the step-down unit in the fault detection system provided in the embodiments of this utility model;

[0020] Figure 3 A schematic diagram of the principle of the conveying unit in the fault detection system provided in the embodiments of this utility model;

[0021] Figure 4 A schematic diagram of the principle of the boost unit in the fault detection system provided in the embodiments of this utility model;

[0022] Figure 5 A schematic diagram of the inverter unit of the fault detection system provided in the embodiment of this utility model. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0026] Thirdly, the "one embodiment" or "embodiment" referred to herein means a specific feature, structure, or characteristic under at least one implementation of the utility model. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor does it mean an embodiment that is independent or selectively excluded from other embodiments.

[0027] Embodiment 1

[0028] Referring to Figure 1 The embodiment provides a fault detection system.

[0029] A fault detection system comprises a detection box 200, the inside of the detection box 200 comprises a conveying unit 201 and a processing unit 202, the conveying unit 201 and the processing unit 202 are electrically connected, the conveying unit 201 and a transformer 100 are electrically connected, and the conveying unit 201 and the processing unit 202 are electrically connected with a power supply unit 300;

[0030] The transformer 100 comprises a primary side 101, a secondary side 102 and a step-down unit 103, the secondary side 102 is electrically connected with the step-down unit 103, through the setting of the step-down unit 103, the current voltage waveform of the secondary side of the transformer 100 can be obtained, and then the voltage signal is transmitted to the processing unit 202; through the cooperation between the conveying unit 201 and the processing unit 202, the voltage can be timely conveyed to the three-phase connection end of the secondary side 102 of the transformer 100, and through the step-down unit 103, the signal is transmitted to the processing unit 202 for signal receiving and processing, so that the voltage-current characteristic curve and the voltage resistance of the three-phase connection end of the secondary side 102 of the transformer 100 can be effectively tested, the step of replacing detection equipment back and forth is saved, the operation is more convenient, and the three-phase detection time of the secondary side 102 of the transformer 100 is shortened.

[0031] Preferably, the feedback unit 400 further comprises a display screen 401 and a printer 402, the display screen 401 and the printer 402 are connected with the processing unit 202, through the setting of the display screen 401 and the printer 402, the result calculated by the processing unit 202 can be timely and effectively displayed, and the result calculated by the processing unit 202 can also be printed out through the printer 402, so that the staff can check and keep.

[0032] In use, during work, first, the three-phase connection end of the secondary side 102 of the transformer 100 is sequentially connected to the conveying unit 201 in the detection box 200, then the device is operated, the power supply unit 300 is controlled by the processing unit 202 in the detection box 200 to provide voltage for the conveying unit 201, the conveying unit 201 sequentially transmits the received voltage to the three-phase connection end of the secondary side 102 of the transformer 100, and the signal can be automatically output; after receiving the voltage, the three-phase connection end of the secondary side 102 is conveyed to the voltage reduction unit 103, the voltage reduction unit 103 transmits the received information to the processing unit 202, the processing unit 202 receives and processes the voltage information transmitted by the voltage reduction unit 103, so as to evaluate the secondary function of the device according to the obtained result after processing, obtain the performance of the transformer 100, and display the calculated result on the display screen 401, so as to assist the staff to quickly judge the three-phase state of the transformer 100, and the transformer 100 can be subjected to pressure test in the form of voltage increase or voltage reduction, thereby saving the cost of the transformer 100 test, shortening the test time of the transformer 100, and facilitating and speeding up the operation.

[0033] Embodiment 2

[0034] With reference to Figure 2 For the second embodiment of the utility model, which is different from the first embodiment, preferably, the conveying unit 201 comprises a first fuse 201a, and the first fuse 201a is electrically connected with the power supply unit 300

[0035] The transformer 100 comprises a primary side 101 and a secondary side 102, and the secondary side 102 is electrically connected with the conveying unit 201, so that the voltage signal formed by the transformer 100 can be effectively transmitted to the conveying unit 201, thereby obtaining the secondary current voltage waveform of the transformer 100, and then transmitting the voltage signal to the processing unit 202, wherein the processing unit 202 is an MCU, and the MCU is connected with the inverter unit and the voltage reduction unit 103 for collection.

[0036] Preferably, the secondary side 102 is provided with a voltage reduction unit 103 on one side, and the voltage reduction unit 103 comprises a voltage signal A, a voltage signal B and a voltage signal C, so that the three phases on the transformer 100 can be distinguished, thereby facilitating the detection box 200 to synchronously detect the three-phase voltage signals on the transformer 100 when the detection box 200 is connected with the transformer 100, so that the test operation is more time-saving and convenient.

[0037] Further, the voltage signal A, the voltage signal B and the voltage signal C are electrically connected with voltage transformers 103d respectively, the voltage transformers 103d are electrically connected with check circuits 103e, the check circuits 103e are electrically connected with subtraction circuits 103f, the subtraction circuits 103f are electrically connected with inverse proportional amplification circuits 103g, the inverse proportional amplification circuits 103g are connected with the processing unit 202 in parallel, the voltage signals of the voltage signal A, the voltage signal B and the voltage signal C are input to the voltage transformers 103d respectively, voltage attenuation is the work of the voltage transformers 103d, and the voltage transformers can be simply understood as a 220V-5V transformer. A-phase voltage input is a 220V voltage, the voltage transformer output end outputs a 5V voltage, if input is 110V, then the voltage transformer outputs a 2.5V voltage, after signal attenuation, the voltage is input to the difference circuit 103e, then passes through the subtraction circuit 103f and the inverse proportional amplification circuit 103g, and finally the signal is output to the processing unit 202, so that the processing unit 202 can obtain the secondary current voltage waveform of the transformer 100, and finally the performance index of the transformer 100 is obtained through calculation.

[0038] The voltage signal 0-220V is input to the voltage transformer, the voltage transformer outputs an AC signal of 0-5V, and the difference circuit is used for measuring the AC signal and also outputs an AC signal of 0-5V. Because the AC signal has positive and negative voltages in a signal period, a reference voltage is first subtracted through the subtraction circuit, so that the subtraction circuit outputs a signal with only negative voltage. Then the signal is inverted to a positive voltage through the inverse proportional amplifier, and the voltage is amplified by 0.6 times, so that the minimum value and the maximum value of the output signal are between 0-3.3V. The MCU 202 can only collect signals of 0-3.3V.

[0039] Embodiment 3

[0040] Reference Figure 3 For the second embodiment of the utility model, the difference from the first embodiment is that the power supply unit 300 is connected with the conveying unit 201 and the processing unit 202 in parallel, the power of the power supply unit 300 can be input to the secondary side 102 of the transformer 100 through the conveying unit 201 by the processing unit 202, and the secondary function of the equipment is evaluated according to the detected data information, and the conveying unit 201 comprises a first fuse 201a, the first fuse 201a is electrically connected with the power supply unit 300, and the first fuse 201a is arranged, so that the power of the power supply unit 300 can be smoothly transmitted to the conveying unit 201.

[0041] The first fuse 201a is preferably connected in parallel with the first air switch 201b, the first air switch 201b is electrically connected with the voltage booster 201c, the voltage booster 201c is electrically connected with the filter 201d, the filter 201d is electrically connected with the inverter unit 201e, the inverter unit 201e is electrically connected with the second fuse 201f, the second fuse 201f is connected in parallel with the second air switch 201g, the high-performance model airplane power supply unit 300 is connected to the equipment inside 201 through the first fuse 201a and the first air switch 201b, the user inputs the first air switch 201b on the operation panel, the voltage booster unit 201c starts to work, lifts the low-voltage power supply unit 300 to 400-500V direct current, and then passes through the filter 201d and the inverter unit module 201e, and then passes through the output second fuse 201f and the output second air switch 201g, and is connected to the secondary side 102 of the transformer 100.

[0042] It is worth noting that: the inverter unit power supply adopts the working principle of three-phase four-bridge arm, and through the three-phase four-bridge arm and the inductance and the capacitor, the sine wave alternating current output can be realized, the above-mentioned inverter unit module 201e can convert the 400-500V direct current into the sine wave alternating current, and the actual transformer 100 input waveform is simulated.

[0043] Embodiment 4

[0044] Reference Figure 4 For the second embodiment of the utility model, which is different from the first embodiment: the voltage booster 201c includes the first switch tube 201c-1 and the second switch tube 201c-2, the first switch tube 201c-1 is electrically connected with the primary side 101, and the first switch tube 201c-1 is electrically connected with the processing unit 202.

[0045] The processing unit 202 is electrically connected with the second switch tube 201c-2, the second switch tube 201c-2 is electrically connected with the secondary side 102, the power supply unit 300 is connected to the Np of the transformer 100 on the circuit board, and the other end of the transformer 100 is connected to two switch tubes, in the working time, the processing unit 202 outputs the PWM wave controlled, the PWM wave controls two first switch tubes 201c-1, two first switch tubes 201c-1 are turned on alternately, the transformer coil is inducted, the secondary side 102 of the coil is inducted, high-voltage alternating current is inducted, and direct current is outputted through the rectifier bridge.

[0046] It is important to note that the constructions and arrangements of the application shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications can be made to the embodiments without departing from the spirit and scope of the novel teachings and advantages described in this application. For example, the elements described herein can be altered or repositioned, the number of elements can be varied or made both larger and smaller, the construction of various elements can be changed, and the division of various components can be altered or eliminated, all without departing from the scope of the application. Accordingly, all such variations are intended to be included within the scope of this application. The order or sequence of any process or method steps can be varied or re-sequenced without departing from the scope of the application. Any "means plus function" clauses are intended to cover the structures described herein as performing the recited functionality and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the application. Accordingly, the present application is not limited to the particular embodiments described and illustrated herein, but extends to all structures that fall within the scope of the appended claims.

[0047] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (i.e., those pertaining to the

[0048] It is understood that in the development of any actual implementation, numerous implementation-specific decisions can be made. These development efforts can significantly impact the complexity of the resulting implementation, but also can yield an implementation that is more tailored to the consummation of the application. These efforts also can yield an implementation that is more in keeping with the scope of the application.

[0049] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application, and although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the technical solutions of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A fault detection system, characterized by: Including, The transformer (100) includes a primary side (101), a secondary side (102), and a step-down unit (103), the secondary side (102) is electrically connected with the step-down unit (103); The detection box (200) includes a conveying unit (201), a processing unit (202) and a power supply unit (300) which are electrically connected with each other; The conveying unit (201) is electrically connected with the transformer (100), so that the power supply unit (300) supplies voltage for the transformer (100); The step-down unit (103) is electrically connected with the processing unit (202), and the voltage signal after being stepped down is detected from the three-phase port of the secondary side (102).

2. The fault detection system of claim 1, wherein: The conveying unit (201) includes a first fuse (201a) which is electrically connected with the power supply unit (300).

3. The fault detection system of claim 2, wherein: The first fuse (201a) and the first air switch (201b) are connected in parallel, the first air switch (201b) is electrically connected with a booster (201c), the booster (201c) is electrically connected with a filter (201d), the filter (201d) is electrically connected with an inverter unit (201e), the inverter unit (201e) is electrically connected with a second fuse (201f), and the second fuse (201f) is electrically connected with a second air switch (201g).

4. The fault detection system of claim 3, wherein: The booster (201c) includes a first switch tube (201c-1) and a second switch tube (201c-2), the first switch tube (201c-1) is electrically connected with the primary side (101), and the first switch tube (201c-1) is electrically connected with the processing unit (202).

5. The fault detection system of claim 4, wherein: The processing unit (202) is electrically connected with the second switch tube (201c-2), and the second switch tube (201c-2) is electrically connected with the secondary side (102).

6. The fault detection system of claim 5, wherein: The step-down unit (103) includes voltage signal A, voltage signal B and voltage signal C, which are connected in parallel.

7. The fault detection system according to any one of claims 1 to 6, characterized in that: The step-down unit (103) further includes three voltage transformers (103d), and the three voltage transformers (103d) are respectively connected with voltage signal A, voltage signal B and voltage signal C.

8. The fault detection system of claim 7, wherein: The voltage transformer (103d) is electrically connected with a difference circuit (103e), the difference circuit (103e) is electrically connected with a subtraction circuit (103f), the subtraction circuit (103f) is electrically connected with an inverse proportional amplification circuit (103g), and the inverse proportional amplification circuit (103g) is connected in parallel with the processing unit (202).

9. The fault detection system of claim 8, wherein: Further comprising a feedback unit (400), the feedback unit (400) includes a display screen (401) and a printer (402), and the display screen (401) and the printer (402) are connected with the processing unit (202).

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