Iron core excitation device and method for seeking and recovering breakdown range of pouring coil

A technology of excitation device and excitation coil, applied in coil manufacturing, measurement device, transformer/inductor coil/winding/connection, etc., can solve the problems of broken transformer core, scrap, cumbersome, etc., to prevent material waste and reduce cumbersome process, the effect of improving the pass rate

Pending Publication Date: 2018-09-28
JIANGXI GANDIAN ELECTRIC
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AI-Extracted Technical Summary

Problems solved by technology

When the insulation somewhere in the transformer coil is weak and cannot withstand the induction high-voltage test, the transformer coil will break down between layers, turns or tap leads, and the entire casting coil is considered irreparable and scrapped
[0004] When it is necessary to find out the cause of the breakdown and find out the location of the breakdown, it is necessary to go through a series of proces...
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Abstract

The invention discloses an iron core excitation device and a method for seeking and recovering breakdown range of a pouring coil. The iron core excitation device is characterized in that a first ironcore post, a second iron core post, a third iron core post and a movable iron core post which have square cross sections form a closed magnetic path, a C-shaped structure is formed at overlap joints among the first iron core post, the second iron core post and the third iron core post by right-angle gaps repeatedly arranged in staggered way, an excitation coil is attached onto a coil wound from the third iron core post and is uniformly arranged along a length direction of the third iron core post, the turns of the excitation coil is in a way that cross section of the iron posts can normally run under rated voltage and normal magnetic flux density, and when the iron core excitation device is closed, contact surfaces between the movable iron core post and the first iron core post and betweenthe movable iron core post and the second iron core post are smoothly attached to form the iron core excitation device. The method is used for seeking a breakdown fault position among segments, layers and turns of an epoxy pouring coil, the complicated process of repeatedly disassembling and assembly a transformer is reduced, the fault position can be judged and recovered only by disassembling the fault coil in one time, and the qualified rate of the pouring coil is improved.

Application Domain

Technology Topic

Magnetic fluxVoltage rating +4

Image

  • Iron core excitation device and method for seeking and recovering breakdown range of pouring coil
  • Iron core excitation device and method for seeking and recovering breakdown range of pouring coil
  • Iron core excitation device and method for seeking and recovering breakdown range of pouring coil

Examples

  • Experimental program(1)

Example Embodiment

[0037] Examples:
[0038] A core excitation device that replaces the original transformer core. It is composed of a closed magnetic circuit composed of a first core column 1, a second core column 2, a third core column 3, and a movable core column 4 with a square section. The base clamp 5, the second clamp 6, the weftless belt 7, the movable clamp 8, and the excitation coil 9 form the core excitation device (see figure 1 ).
[0039] The overlaps between the first core column 1, the second core column 2 and the third core column 3 are repeated staggered right-angle joints to form a "匚" shape (see figure 2 ), the first core column 1 is clamped by two base clamps 5 and used as a floor base; the second core column 2 is clamped by two second clamps 6; the third core column 3 is clamped with no weft The belt 7 is tightened and solidified into an integral structure; the movable iron core column 4 is clamped by the movable clamp 8.
[0040] The excitation coil 9 is a coil wound close to the third iron core column 3, which is evenly distributed along the length of the third iron core column 3, and its number of turns is that the cross section of the iron core column can operate normally under the rated voltage and normal magnetic flux density. Number of turns.
[0041] The contact surfaces between the movable iron-core column 4 and the first iron-core column 1 and the third iron-core column 3 should be smooth and close together.
[0042] The movable clamp 8 and the movable iron core column 4 form another whole. There is no mechanical hard connection between the iron core column 1 and the iron core column 3, and it can be removed at any time so that the tested coil can enter the iron core column 3, and it can work by The lines of magnetic force draw the movable iron-core column 4 with the first iron-core column 1 and the third iron-core column 3 together (like an AC contactor works), so the contact surface is required to be flat and close together. However, it is also possible to add a base to connect the movable clamping piece 8 and the base clamping piece 5 together and flip it movably, but the manufacturing is a little more complicated.
[0043] First, close the movable iron core column 4, and apply an adjustable voltage that can be raised from zero to the rated voltage on the outlet ends a and b of the excitation coil 9, and observe the current change of the ammeter in the excitation coil 9, and record the ammeter The maximum value of, that is, the no-load current value of the excitation device, is used as the reference current for comparison with the current value when the measured high voltage coil 10 is inserted later.
[0044] Open the movable iron core column 4, and for the epoxy cast high voltage coil 10 that is judged to have a breakdown in the induction high voltage test, use an insulating rope to sleeve the third iron core column 3 around the excitation coil 9 and connect it to the excitation coil 9 Keep the distance above 40mm, close the movable iron core column 4, and start the voltage increase from zero on the outlet ends a and b of the excitation coil 9 to observe the current change of the ammeter in the excitation coil 9.
[0045] When it is found that the current number of the ammeter in the excitation coil 9 is compared with the no-load current value of the excitation device, the current number increases rapidly, far exceeds the reference current value, and is close to the full scale, immediately stop boosting. At this time, the The breakdown point is already in a short-circuit state. The coil 10 with the short-circuit point begins to heat up, and the heat is transferred to the surface of the coil 10. The coil 10 is wound in sections. Touch the surface of the coil section by section with the back of your hand, and there will be a significant temperature difference between the sections. , So as to verify and determine the line segment where the coil 10 is broken down by the induction high voltage test. (Note: Do not touch the live conductor of the coil to prevent electric shock)
[0046] Analyze the nature of breakdown: Generally, there are two types of breakdown: one is breakdown between terminals and leads, which is inter-segment breakdown, and the other is layer-to-turn breakdown. What is the nature of breakdown? Breakdown determines the method of search and repair afterwards.
[0047] If it is a breakdown between the leads of each terminal, which is an inter-segment breakdown, the DC resistance value between the terminals of the coil 10 is measured and compared with the original resistance value, a great change will occur, and the difference will be large. At this time, the “minimally invasive surgery” that opens a small area is performed on the short-circuit point.
[0048] Furthermore, according to the magnitude of the difference, it is judged that it is the breakdown between the leads of the coil. Then, according to the direction of the leads, perform hole drilling detection at the most likely breakdown point on the casting body of the wiring panel 11, and the depth of the cut is based on the lead. Observe whether the distance between the leads is too close and the surrounding resin is cured Whether the object changes color, if so, set aside the distance, pad with an insulator, and re-cast the opened hole. After curing, it will be ground and surface treated to restore the coil to normal. The tested pouring high-voltage coil 10 is re-inserted into the third iron core column 3, and the no-load current value of the excitation device is observed to determine whether it is repaired.
[0049] If it belongs to the coil layer and the breakdown between the coils, the DC resistance between the terminals of the coil 10 will not change greatly, and the difference is small compared with the original resistance value. At this time, the "surgery" that opens a large area on the short-circuit point of breakdown is performed.
[0050] Further, the encapsulating resin of the short-circuited section of the coil is chipped, and the position of the chipping is the position of the section of the coil away from the wiring board 11 in the circumferential direction of the coil and a position other than the tangent to the circumference (see Figure 4 , When the coil layer and the interlayer breakdown, the position of the cut is the position of the coil along the circumference of the coil away from the wiring board 11 and the position other than the circumferential tangent, along the circumferential arrow direction), and at the same time select the edge of this segment line and the outermost one The starting position of the layer coil (see image 3 ), the size of the chiseled area is suitable to be able to see the outermost turn, and cut the chiseled wire.
[0051] Furthermore, re-insert the tested pouring high-voltage coil 10 into the third iron core column 3, measure the voltage value between the connected terminals of the chopping point and observe the current of the ammeter in the excitation coil 9 and compare it with the winding wire Whether the contrast of the number of turns is in a proportional relationship can exclude whether the outermost layer is short-circuited with the second adjacent layer inward. If it is not a short circuit between the two layers, tear off the turns of the layer, and then look deep to find whether the second layer and the third layer are short-circuited, and repeat the above operation process until the short-circuit layer is found. Once the torn turns at the breakdown short-circuit point are disconnected, the current value of the ammeter in the excitation coil 9 immediately drops and returns to the no-load current value of the excitation device under normal operation. (Note: Before the short-circuit point is removed, the high voltage that endangers the measurement will not appear at the outlet terminals of the coil. Even if the short-circuit point is removed, the rated voltage of the coil will not be reached due to the large coupling leakage magnetic field).
[0052] Furthermore, after the short-circuit layer is detected, the encapsulating resin related to the wiring board 11 is removed, the damaged turns are removed, new turns are added, and the repaired turns are again inserted into the third core column 3 , Observe whether the current is restored to the no-load current value of the excitation device, and measure whether the voltage between the outlet terminals A and A1, A3, A5, X and A2, A4, A6 of the cast high voltage coil 10 is proportional to the number of turns of the winding Relationship: Although this proportional relationship is not an absolute ratio calculated by the number of coil turns, it is an approximate relative proportional relationship. Then, according to the situation of opening the encapsulation layer, decide how to make up the encapsulation resin of the coil, use 0.5mm thick epoxy glass cloth board as a partial outer mold, wrap it in the cut, carry out partial vacuum casting, and then carry out the coil After surface treatment, the original appearance and internal quality of the epoxy cast body can be restored.
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