CN206876809U - A device for simulating inter-turn short-circuit partial discharge of transformer - Google Patents

Abstract

It the utility model is related to power equipment state monitoring and fault diagnosis technology field, and in particular to a kind of device of analogue transformer turn-to-turn short circuit shelf depreciation, specifically include voltage control module, transformer, discharge module；It is transformer-supplied that voltage control module, which is used for, and the lifting of control voltage；Transformer is used for the transformer as simulated experiment；Discharge module is used for analogue transformer turn-to-turn insulation shelf depreciation；The power output end of voltage control module and the voltage side of transformer connect, and discharge module is placed in inside transformer.The utility model realizes real simulation transformer along face shelf depreciation, can be verifying partial discharge monitoring device or detecting instrument to lean measurement effect of the transformer along face shelf depreciation, partial discharge monitoring device or detecting instrument product control quality, the general level of the health and service efficiency are favorably improved, has reached partial discharge monitoring device or risk in detecting instrument O＆M, efficiency and cost synthesis is optimal.

Description

A device for simulating inter-turn short-circuit partial discharge of transformer

technical field

The utility model relates to the technical field of state monitoring and fault diagnosis of electric equipment, in particular to a device for simulating the partial discharge of a short circuit between turns of a transformer.

Background technique

Partial discharge is one of the important characteristic parameters reflecting the insulation performance of transformer equipment. It is a symptom and manifestation of insulation deterioration of transformer equipment, and it is also the cause of further deterioration of equipment insulation. In addition, the insulation fault is an important reason that affects the safe and stable operation of power transformers, and the inter-turn insulation fault occupies the main factor. Therefore, simulating the characteristics of partial discharge of transformer equipment can help to verify the effectiveness of the detection method and early detection of early internal insulation defects, and through timely fault diagnosis and status evaluation, specific treatment measures can be taken to avoid its malignant development .

Parts that are prone to partial discharge inside the transformer mainly include: end lead wires and their inter-turns, end insulating cardboard, inter-turn insulation, enclosures, coil pressure plates, iron cores, fasteners, and air bubbles in oil, etc. They can be summarized as: oil gap discharge with insulation barrier, air gap discharge in solid insulation, air bubble discharge in oil, surface discharge, floating potential discharge, discharge induced by small impurity bridges, etc. From the perspective of electrical breakdown, it can be divided into gap discharge, surface discharge, needle plate discharge, ground electrode discharge, and metal particle discharge. These situations are usually unavoidable in transformer construction.

With the deepening of power companies' research and application of equipment condition monitoring and evaluation technology, ultra-high frequency partial discharge detection methods have been widely used in the detection of partial discharge such as surface discharge of transformer equipment. However, on the one hand, the complex internal structure of the transformer will cause severe refraction and reflection of the UHF electromagnetic wave signal inside the transformer, so it is difficult to accurately identify the mode and intensity of the internal discharge of the transformer using the UHF detection method; on the other hand, for the transformer As far as the winding is concerned, slight inter-turn insulation discharge may also cause inter-turn short circuit, or even more serious consequences. Therefore, there is an urgent need for a discharge device that can meet the requirements of generating discharge without affecting the macroscopic performance of the insulating layer.

Contents of the invention

In order to solve the above problems, the utility model provides a device for simulating the partial discharge of the inter-turn short circuit of a transformer. The specific technical scheme is as follows:

A device for simulating inter-turn short-circuit partial discharge of a transformer includes a voltage control module, a transformer, and a discharge module; the voltage control module is used to supply power to the transformer and control the rise and fall of the voltage; the transformer is used as a transformer for simulation experiments; The discharge module is used for simulating the partial discharge of the inter-turn insulation of the transformer; the power output terminal of the voltage control module is connected to the voltage side of the transformer, and the discharge module is placed inside the transformer.

Further, the voltage control module includes a controller, a voltage regulator, an isolation transformer, and a filter; the controller is used to monitor and control the input and output current, voltage, time and opening and closing, and realize overcurrent protection; the The voltage regulator includes a moving coil and a main coil, which are used to adjust the size of the input voltage and the output voltage; the isolation transformer includes a primary winding and a secondary winding, and is used to achieve electrical insulation between the voltage regulator and the filter , to suppress high-frequency clutter from being transmitted to the filter; the filter uses a power filter, including a common-mode inductor at the power supply end, a differential-mode element, and a load terminal, for filtering clutter and suppressing interference noise; the controller and The moving coil of the voltage regulator is connected, the main coil of the voltage regulator is connected to the primary winding of the isolation transformer, the secondary winding of the isolation transformer is connected to the common mode inductance of the power supply end of the power filter, and the differential mode components of the power filter are connected to the control The load end of the power filter is connected to the transformer.

Further, the transformer adopts a partial discharge-free experimental transformer.

Further, the discharge module includes a shell, a bracket, an electrode I, an electrode II, and a movable electrode; the shell is a hollow cylindrical structure;

The bracket is placed inside the shell, and the bracket includes an upper horizontal support part, a lower horizontal support part, and a vertical support tube; the upper horizontal support part, the lower horizontal support part, and the vertical support tube are respectively hollow cylinder structures, and the upper horizontal support part is socketed Outside the vertical support tube and fixed on the upper part of the vertical support tube, the lower horizontal support part is sleeved outside the vertical support tube and fixed on the bottom of the vertical support tube and connected to the bottom of the shell; the upper part of the vertical support tube is provided with external threads ; The lower part of the vertical support pipe is provided with an internal thread;

Electrode 1 comprises an upper horizontal part, a lower horizontal part, and a vertical part; the upper horizontal part and the lower horizontal part are hollow cylinder structures respectively; the inner walls of the hollow cylinders of the upper horizontal part and the lower horizontal part are provided with threads, and the threads and the hollow cylinders The hollow part cooperates to form the upper screw hole and the lower screw hole respectively; the vertical part is respectively connected with the same side of the upper horizontal part and the lower horizontal part, and the lower horizontal part of the electrode 1 is socketed with the upper part of the vertical support tube of the bracket and passed through the lower horizontal part. The screw hole is matched and fixed with the external thread on the top of the vertical support pipe; the lower horizontal part of the electrode 1 is in contact with the upper horizontal support part of the support;

The electrode II includes a base, a connecting portion, and a conductive portion, the connecting portion is fixed on the base, the connecting portion is provided with external threads, the conductive portion is fixed on the connecting portion, the conductive portion is sleeved inside the vertical support tube of the bracket and passed The external thread is matched and fixed with the internal thread at the lower part of the vertical support tube; the base is arranged outside the shell; the radial direction of the base is provided with wire fixing screw holes;

One end of the movable electrode is sleeved inside the vertical support tube of the bracket and is in contact with the conductive part of the electrode II, and the other end of the movable electrode is arranged outside the casing and has a distance from the upper horizontal part of the electrode I;

Electrode I is connected to the xth turn of the transformer low-voltage winding through a wire, and electrode II is connected to the yth turn of the transformer low-voltage winding through a wire; the upper screw hole of the upper horizontal part of the electrode I is used for installing screws, and the electrode I is adjusted by adjusting the screw The distance between the upper horizontal part of the transformer and the movable electrode realizes the partial discharge of the short circuit between the turns of the transformer.

Further, the controller adopts a high-voltage experimental transformer power console.

Further, the voltage regulator adopts a three-phase electric voltage regulator.

Further, the isolation transformer adopts a three-phase transformer, and the three-phase transformer is composed of a cylindrical winding and a laminated iron core.

Further, the filter adopts a three-phase four-wire filter.

Further, the shell of the discharge module is made of organic glass.

Further, the inter-turn power-taking electrode I and the inter-turn power-taking electrode II are made of stainless steel.

The utility model provides a device for simulating the inter-turn short-circuit partial discharge of a transformer, which simulates the real inter-turn insulation partial discharge inside the transformer, specifically refers to the maximum magnitude of the inter-turn insulation partial discharge pulse generated by the discharge module under the action of the step voltage. The value, average pulse amplitude, and pulse power generally increase with the increase of the test voltage, and the pulse repetition frequency appears a local maximum with the increase of the applied voltage. The above conditions meet the basic conditions for realizing partial discharge of inter-turn insulation, and have the characteristic parameters such as the detection frequency, sensitivity, linearity, pulse count, dynamic range and diagnosis and identification of partial discharge monitoring devices or detection instruments for transformer inter-turn insulation partial discharge. In order to discover the performance problems of partial discharge monitoring devices or testing instruments in engineering applications as early as possible, and affect the accurate monitoring and early warning of abnormal insulation of power transformers, and improve the monitoring and early warning capabilities of abnormal insulation of power transformers.

Description of drawings

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

Fig. 2 is the front view of the discharge module in the utility model;

Fig. 3 is the AA sectional view of the discharge module in the utility model;

Fig. 4 is a schematic structural view of the bracket in the discharge module of the present invention;

Fig. 5 is the structural representation of the electrode 1 in the discharge module of the present invention;

Fig. 6 is a schematic structural view of the electrode II in the discharge module of the present invention;

7 is a schematic structural view of the movable electrodes in the discharge module of the present invention;

Among them: 1: shell,

2: bracket, 21: upper horizontal support part, 22: lower horizontal support part, 23: vertical support tube;

3: electrode I, 31: upper horizontal part, 32: lower horizontal part, 33: vertical part, 34: upper screw hole, 35: lower screw hole;

4: electrode II, 41: base: 42: connection part, 43: conductive part, 44: wire fixing screw hole;

5: active electrode.

detailed description

In order to better understand the utility model, the utility model will be further described below in conjunction with the accompanying drawings and specific embodiments:

As shown in Figure 1, a device for simulating inter-turn short-circuit partial discharge of a transformer includes a voltage control module, a transformer, and a discharge module; the voltage control module is used to supply power to the transformer and control the rise and fall of the voltage; the transformer is used as a transformer for simulation experiments ; The discharge module is used to simulate the partial discharge of the inter-turn insulation of the transformer; the power output terminal of the voltage control module is connected to the voltage side of the transformer, and the discharge module is placed inside the transformer.

The voltage control module includes a controller, a voltage regulator, an isolation transformer, and a filter; the controller is used to monitor and control input and output current, voltage, time, opening and closing, and realize overcurrent protection; the voltage regulator includes a moving coil 1. The main coil is used to adjust the size of the input voltage and the output voltage; the isolation transformer includes the primary winding and the secondary winding, which are used to achieve electrical insulation between the voltage regulator and the filter, and suppress the transmission of high-frequency clutter to the Filter; the filter adopts a power filter, including a common mode inductor at the power supply end, a differential mode element, and a load end, which are used to filter out clutter and suppress interference noise; the controller is connected to the moving coil of the voltage regulator, and the voltage regulator's The main coil is connected to the primary winding of the isolation transformer, the secondary winding of the isolation transformer is connected to the common mode inductance of the power supply end of the power filter, the differential mode element of the power filter is connected to the controller, and the load terminal of the power filter is connected to the transformer . The controller adopts a high-voltage experimental transformer power console, specifically the TPKZT type high-voltage experimental transformer power console, the voltage regulator adopts a three-phase electric voltage regulator, specifically selects TESGC2J series three-phase electric voltage regulator, and the isolation transformer adopts a three-phase transformer. The three-phase transformer is composed of a cylindrical winding and a laminated iron core. Specifically, the SG9-15/0.38 series three-phase transformer is selected. The filter adopts a three-phase four-wire filter. Specifically, the Q310 series three-phase four-wire filter is selected. Its rated current is 6 to 50 amperes, its operating frequency is 50 Hz, and its maximum leakage current is less than 2 milliamperes. Its main function is to suppress interference noise.

The transformer adopts a non-partial discharge test transformer, specifically an oil-immersed self-cooling three-phase three-winding non-partial discharge test transformer. Its low-voltage side voltage is 400 volts, its rated capacity is 50 kVA, and its total weight (including oil) reaches 2580 kg, its internal oil weighs 1150 kg, and its main feature is that it can implant a discharge module at a designated position reserved inside it.

As shown in Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, and Figure 7, the discharge module includes a shell 1, a bracket 2, an electrode I 3, an electrode II4, and a movable electrode 5; the shell is a hollow cylinder structure;

The bracket 2 is placed inside the shell 1, and the bracket 2 includes an upper horizontal support portion 21, a lower horizontal support portion 22, and a vertical support tube 23; the upper horizontal support portion 21, the lower horizontal support portion 22, and the vertical support tube 23 are respectively hollow cylinders body structure, the upper horizontal support part 21 is socketed outside the vertical support tube 23 and fixed on the upper part of the vertical support tube 23, and the lower horizontal support part 22 is socketed outside the vertical support tube 23 and fixed on the bottom of the vertical support tube 23 And connected to the bottom of the shell 1; the upper part of the vertical support pipe 23 is provided with external threads; the bottom of the vertical support pipe 23 is provided with internal threads;

The electrode 13 comprises an upper horizontal part 31, a lower horizontal part 32, and a vertical part 33; the upper horizontal part 31 and the lower horizontal part 32 are hollow cylinder structures respectively; Screw thread is set, and thread cooperates with the hollow part of hollow cylinder to form upper screw hole 34, lower screw hole 35 respectively; The upper part 32 of the vertical support pipe 23 of the support 2 is socketed and fixed through the lower screw hole 35 and the external thread on the top of the vertical support pipe 23; the lower horizontal part 32 of the electrode 13 is connected to the upper horizontal support part 21 touch;

The electrode II 4 includes a base 41, a connecting portion 42, and a conductive portion 43, the connecting portion 42 is fixed on the base 41, the connecting portion 42 is provided with external threads, the conductive portion 43 is fixed on the connecting portion 42, and the conductive portion 43 is sleeved on the bracket 2 The inside of the vertical support pipe 23 is matched and fixed by the external thread of the connecting part 42 and the internal thread of the bottom of the vertical support pipe 23; the base 41 is arranged outside the shell 1; the radial direction of the base 41 is provided with a wire fixing screw hole 44;

One end of the movable electrode 5 is sleeved inside the vertical support tube 23 of the bracket 2 and is in contact with the conductive portion 43 of the electrode II 4, and the other end of the movable electrode 5 is arranged outside the casing 1 and connected to the upper horizontal portion 31 of the electrode I 3 There is a gap;

Electrode I 3 is connected with the x-th turn of the transformer low-voltage winding through a wire, and electrode II 4 is connected with the y-th turn of the transformer low-voltage winding through a wire; the upper screw hole 34 of the upper horizontal part of the electrode I 3 is used for installing screws, when the transformer is energized Finally, adjust the screw to adjust the distance between the upper horizontal part 31 of the electrode I3 and the movable electrode 5 to realize partial discharge of the short circuit between turns of the transformer. The height range of the discharge module is 6-15cm. The shell 1 of the discharge module is made of plexiglass; the electrodes I3 and II4 are made of stainless steel; the movable electrode 5 is a conductive metal rod.

By adjusting the output voltage of the voltage regulator, when the partial discharge threshold is reached, a significant discharge will be generated at the distance between the upper horizontal part 31 of the electrode I3 and the movable electrode 5, thereby simulating the partial discharge defect of the inter-turn insulation of the transformer.

The utility model realizes the real simulation of partial discharge along the surface of the transformer, and can be used to verify the measurement effect of the partial discharge monitoring device or detection instrument on the partial discharge of the transformer along the surface, which is helpful to improve the quality control quality and health level of the partial discharge monitoring device or detection instrument And use efficiency, to achieve the comprehensive optimization of risk, efficiency and cost in the operation and maintenance of partial discharge monitoring devices or testing instruments.

The utility model is not limited to the above-mentioned specific implementation methods, the above-mentioned is only a preferred implementation case of the utility model, and is not intended to limit the utility model, and all those made within the spirit and principles of the utility model Any modification, equivalent replacement and improvement, etc. shall be included in the protection scope of the present utility model.

Claims (10)

1. A device for simulating inter-turn short-circuit partial discharge of a transformer, characterized in that: it comprises a voltage control module, a transformer, and a discharge module; the voltage control module is used to supply power to a transformer, and controls voltage rise and fall; The transformer is used as a simulation experiment; the discharge module is used to simulate the partial discharge of the inter-turn insulation of the transformer; the power output terminal of the voltage control module is connected to the voltage side of the transformer, and the discharge module is placed inside the transformer. 2. The device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 1, characterized in that: the voltage control module includes a controller, a voltage regulator, an isolation transformer, and a filter; the controller is used for monitoring , control the current, voltage, time and opening and closing of input and output, and realize overcurrent protection; the voltage regulator includes a moving coil and a main coil, which are used to adjust the size of the input voltage and the output voltage; the isolation transformer Including the primary winding and the secondary winding, which are used to achieve electrical insulation between the voltage regulator and the filter, and suppress the transmission of high-frequency clutter to the filter; the filter uses a power filter, including common mode inductors at the power supply end, Differential mode components and load terminals are used to filter clutter and suppress interference noise; the controller is connected to the moving coil of the voltage regulator, the main coil of the voltage regulator is connected to the primary winding of the isolation transformer, and the secondary winding of the isolation transformer The side winding is connected to the common mode inductance of the power supply end of the power filter, the differential mode element of the power filter is connected to the controller, and the load terminal of the power filter is connected to the transformer. 3. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 1, wherein the transformer is a non-partial discharge experimental transformer. 4. A device for simulating interturn short-circuit partial discharge of a transformer according to claim 1, characterized in that: said discharge module comprises a casing, a support, electrode I, electrode II, and a movable electrode; the casing is a hollow cylinder structure; The bracket is placed inside the shell, and the bracket includes an upper horizontal support part, a lower horizontal support part, and a vertical support tube; the upper horizontal support part, the lower horizontal support part, and the vertical support tube are respectively hollow cylinder structures, and the upper horizontal support part is socketed Outside the vertical support tube and fixed on the upper part of the vertical support tube, the lower horizontal support part is sleeved outside the vertical support tube and fixed on the bottom of the vertical support tube and connected to the bottom of the shell; the upper part of the vertical support tube is provided with external threads ; The lower part of the vertical support pipe is provided with an internal thread; Electrode 1 comprises an upper horizontal part, a lower horizontal part, and a vertical part; the upper horizontal part and the lower horizontal part are hollow cylinder structures respectively; the inner walls of the hollow cylinders of the upper horizontal part and the lower horizontal part are provided with threads, and the threads and the hollow cylinders The hollow part cooperates to form the upper screw hole and the lower screw hole respectively; the vertical part is respectively connected with the same side of the upper horizontal part and the lower horizontal part, and the lower horizontal part of the electrode 1 is socketed with the upper part of the vertical support tube of the bracket and passed through the lower horizontal part. The screw hole is matched and fixed with the external thread on the top of the vertical support pipe; the lower horizontal part of the electrode 1 is in contact with the upper horizontal support part of the support; The electrode II includes a base, a connecting portion, and a conductive portion, the connecting portion is fixed on the base, the connecting portion is provided with external threads, the conductive portion is fixed on the connecting portion, the conductive portion is sleeved inside the vertical support tube of the bracket and passed The external thread is matched and fixed with the internal thread at the lower part of the vertical support tube; the base is arranged outside the shell; the radial direction of the base is provided with wire fixing screw holes; One end of the movable electrode is sleeved inside the vertical support tube of the bracket and is in contact with the conductive part of the electrode II, and the other end of the movable electrode is arranged outside the casing and has a distance from the upper horizontal part of the electrode I; Electrode I is connected to the xth turn of the transformer low-voltage winding through a wire, and electrode II is connected to the yth turn of the transformer low-voltage winding through a wire; the upper screw hole of the upper horizontal part of the electrode I is used for installing screws, and the electrode I is adjusted by adjusting the screw The distance between the upper horizontal part of the transformer and the movable electrode realizes the partial discharge of the short circuit between the turns of the transformer. 5. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 2, characterized in that: said controller adopts a high-voltage experimental transformer power console. 6. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 2, wherein the voltage regulator is a three-phase electric voltage regulator. 7. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 2, characterized in that: the isolation transformer is a three-phase transformer, and the three-phase transformer is composed of a cylindrical winding and a laminated iron core composition. 8. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 2, wherein the filter is a three-phase four-wire filter. 9. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 4, characterized in that: the shell of the discharge module is made of organic glass. 10. A device for simulating inter-turn short-circuit partial discharge of a transformer according to claim 4, characterized in that: the inter-turn power-taking electrode I and the inter-turn power-taking electrode II are made of stainless steel.