CN203164332U - Transformer DC magnetic bias characteristic testing apparatus - Google Patents

Abstract

The utility model relates to a transformer DC bias characteristic test device, comprising an AC power supply, an intermediate transformer, a test transformer, a signal acquisition component, a DC power supply, a test industrial computer and a test load. The AC power supply, the intermediate transformer, the test transformer, The test loads are connected in sequence, the DC power supply is connected between the test transformer and the test load, the signal acquisition component is connected to the test transformer, and the test industrial computer is connected to the signal acquisition component. Compared with the prior art, the utility model has the advantages of high accuracy, flexible operation and the like.

Description

A transformer DC bias characteristic test device

technical field

The utility model relates to a testing device for a transformer, in particular to a testing device for the DC bias magnetic characteristic of a transformer.

Background technique

Ground potential changes caused by solar magnetic storms, DC transmission, metallurgy and rail transit, etc., form a DC circuit through the grounding points of transmission lines and coil equipment windings, causing DC bias phenomena in transformers, transformers, etc., resulting in increased noise in operating equipment, Vibration intensifies and local overheating and other problems will increase the harmonics and losses of the power grid, which will adversely affect the operation of the power grid.

Although the existing power transformers have a certain ability to withstand DC bias, there is no corresponding inspection device for the ability of the power transformer to withstand DC bias when a specified value of DC current flows. Therefore, the existing The untested power transformers cannot complete the inspection of the ability to withstand DC bias before leaving the factory, and the power transformers that have not been inspected may cause equipment failure due to insufficient ability to withstand DC bias when they are put into actual work after leaving the factory.

Contents of the invention

The purpose of this utility model is to provide a transformer DC bias magnetic characteristic test device with high accuracy and flexible operation in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

A test device for DC bias magnetic characteristics of a transformer, including an AC power supply, an intermediate transformer, a test transformer, a signal acquisition component, a DC power supply, a test industrial computer, and a test load, and the AC power supply, the intermediate transformer, the test transformer, and the test load are connected in sequence , the DC power supply is connected between the test transformer and the test load, the signal collection component is connected to the test transformer, and the test industrial computer is connected to the signal collection component.

The signal collection component includes a vibration sensor, an optical fiber temperature detector and an induction coil.

The test transformer includes a winding, an iron core and a box wall, the vibration sensor is arranged on the winding, the optical fiber temperature detector is arranged on the iron core, and the induction coil is arranged on the box wall.

The DC power supply includes a connected power supply circuit and an adjustable resistor, and the DC power supply is connected between the secondary side of the test transformer and the neutral point of the test load.

The test load is a shunt reactor.

Compared with the prior art, the utility model analyzes the vibration characteristics, temperature field and leakage magnetic field distribution of the transformer during DC bias by placing vibration sensors, optical fiber temperature detectors and induction coils on the test transformer winding, iron core and box wall characteristics, so as to obtain the DC bias characteristics of the test transformer, which has the advantages of high measurement accuracy and flexible operation.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

As shown in Figure 1, a transformer DC bias characteristic test device, including AC power supply 1, intermediate transformer 2, test transformer 3, signal acquisition component 4, DC power supply 5, test industrial computer 6 and test load 7, the described The AC power supply 1, the intermediate transformer 2, the test transformer 3, and the test load 7 are connected in sequence, the DC power supply 5 is connected between the test transformer 3 and the test load 7, and the signal acquisition component 4 is connected with the test transformer 3, and the The test industrial computer 6 described above is connected with the signal acquisition component 4. The test load 7 is a shunt reactor.

The signal acquisition component includes a vibration sensor, an optical fiber temperature detector and an induction coil. The vibration sensor is arranged on the winding of the test transformer, the optical fiber temperature detector is arranged on the iron core, and the induction coil is arranged on the box wall. The vibration sensor, optical fiber temperature detector and induction coil respectively collect the vibration signal, temperature signal and electromagnetic signal of the test transformer, and transmit the signal to the test industrial computer 6, and the test industrial computer 6 analyzes the vibration characteristics and temperature field of the transformer during DC bias And leakage magnetic field distribution characteristics, so as to obtain the DC bias magnetic characteristics of the test transformer, and display it on the test industrial computer.

The DC power supply 5 includes a connected power circuit and an adjustable resistor R, and the power circuit is composed of a storage battery E, a capacitor C and an inductance L. The DC power supply 5 is connected between the secondary side of the test transformer 3 and the neutral point of the test load 7, and the DC current is injected into the test transformer through the loop between the secondary side of the test transformer and the neutral point of the shunt reactor. Adjust the resistor R to change the size of the injected DC component. A1 and A2 in the figure are ammeters.

Claims (5)

1. transformer DC magnetic bias characteristic test apparatus, it is characterized in that, comprise AC power, intermediate transformer, testing transformer, signals collecting assembly, direct supply, test industrial computer and test load, described AC power, intermediate transformer, testing transformer, test load connect successively, described direct supply is connected between testing transformer and the test load, described signals collecting assembly is connected with testing transformer, and described test industrial computer is connected with the signals collecting assembly.

2. a kind of transformer DC magnetic bias characteristic test apparatus according to claim 1 is characterized in that, described signals collecting assembly involving vibrations sensor, optical fiber temperature-measurement device and inductive coil.

3. a kind of transformer DC magnetic bias characteristic test apparatus according to claim 2, it is characterized in that, described testing transformer comprises winding, iron core and tank wall, described vibration transducer is located on the winding, described optical fiber temperature-measurement device is located on the iron core, and described inductive coil is located on the tank wall.

4. a kind of transformer DC magnetic bias characteristic test apparatus according to claim 1, it is characterized in that, described direct supply comprises power circuit and the adjustable resistance that is connected, and this direct supply is connected between the neutral point of testing transformer secondary side and test load.

5. a kind of transformer DC magnetic bias characteristic test apparatus according to claim 1 is characterized in that, described test load is shunt reactor.