What Is a Cooling Coil?

Turbogenerator rated power (turbogeneratorratedpower) Turbine generator meets the rated output power, also known as rated output (ratedoutput) or rated capacity (ratedcapacity).

The rated power of the alternator refers to the apparent power of the generator at the rated power factor, which is expressed by kV · A or MV · A together with the power factor; it can also be the active power of the generator, which is expressed by kw or MW together with the power factor.

The so-called quotas refer to the values of all electrical and mechanical quantities specified by the manufacturer on the generator and marked on the nameplate, as well as the duration of operation (if there is no special regulation, it generally means that there is no time limit) and

Stator winding embedding process

1.1 Place the stator core flat on the wire frame. The wire must be inserted in the direction of the core burr, and the bottom of the slot must be insulated.

1.2 Put the three-phase windings neatly on the left end of the iron core, and the wire insertion tools on the right end neatly. The three-phase wire ends of A, B, and C are arranged on the surface, bottom, and surface.

1.3 The embedding process adopts two kinds of live slotting or dead slotting: 1.3.1 For the live slotting process: Put the slotting paper in the slot to be embedded, and place the first coil of phase A ( Phase A, the thread on the upper edge of the thread is shifted from the straight part to the end (the same for each slot), twist the lower edge with the left finger and insert it into the slot from the middle of the slot paper, and pass the right hand through the inner circle of the core. , Pinch the right end of the coil tightly, pull it into the slot, insert the covering insulation. Push the upper edge to the iron core lined with padding at the pitch, tap the two ends of the coil so that the upper edge is inserted into the rear end so that it is not higher than the core, and then pull out the slot paper and drive it into the slot wedge (the end with the oblique head) To the bottom of the slot, when the number of coils in this polar group is greater than one, the entire coil is embedded and then driven into the slot wedge). The slot wedge should be properly tightened into the slot (finger will not easily push the slot wedge). The height of the slot wedge should be Below the inner circle of the iron core, the ends are arranged so that the upper edge is easy to embed. Then remove the cable tie and place the slot paper in the next slot to be embedded. 1.3.2 Using dead-lead groove process: Displace the wire on the first coil of phase A (phase A, with the wire ends on the upper side) from the straight part to the end (the same for each slot), and use the left finger to move the lower side Twist into the slot, right hand through the inner circle of the iron core, pinch the right end of the coil, and pull into the slot with the through pin to squeeze it, cut off the excess slot insulation, remove the through pin, cover the slot insulation with each other with the through pin Flatten (double-layer windings are inserted into the middle layer of covering paper), push the upper layer edge to the iron core lined with paper pads at the pitch, tap the two ends of the coil so that the upper layer edge is embedded in the rear end not higher than the iron core, and then drive into the slot Wedge (the end with the oblique head goes to the bottom of the slot, when the number of coils in this polar phase group is greater than one, the entire coil is embedded and then driven into the slot wedge). The slot wedge should be properly tightened into the slot (finger will not easily push the slot Wedge), the height of the groove wedge should be lower than the inner circle of the iron core, and the ends are arranged so that the upper edge can be easily inserted.

1.4 Insert a slot at the bottom of the first coil of phase B according to the method described above (the phase B wire head is on the lower layer edge), push the upper layer edge to the pitch and place it according to the above method (phase insulation is not padd for the time being, this pole phase group When the number of coils is two or more, the first slot of the phase must be spaced two or more slots apart, and the coils of the polar phase group are embedded. Then, the slot wedges are driven and the ends are adjusted.

1.5 Insert one slot at a time. Insert the lower edge of the first coil of phase C (C-phase wire head is on the upper edge) according to the above method, and then twist the upper edge of the pitch position flat. The insulation between the left and right ends of the pad is in contact with the slot insulation, and the two ends of the stator coil are equal in length at the ends of the core (when there are two or more coils in the pole phase group, the first slot in the phase is also embedded. Separate two or more slots, insert all the coils of this phase in the same way), drive into the slot wedges, and straighten the ends.

1.6 When inserting each group of coils, follow the method of "5.1.5". When embedding in the counter line, turn the counter line upside down, arrange the lines neatly, insert them one by one, and drive into the slot wedge.

1.7 After all the coils are embedded, round the bell mouth, insert a small phase angle, arrange the slot wedges, check if the wire ends are wrong, and then paste the operator ID number for inspection.

Specific steps are as follows

2.1 Concentric winding embedding wire 2.1.1 First embed the lower edge of the small circle of the first phase coil, then insert the lower edge of the large circle, seal the slot, and the upper edge will not be temporarily inserted. 2.1.2 Separate two slots, insert the small and large circles of the second phase coil into the lower layer edge, seal the slot, and the upper layer edge will not be embedded for the time being. 2.1.3 Two slots apart, the small and large circles of the third phase coil are embedded in the lower layer edge, the upper layer is embedded in the previous slot of the lower phase of the small phase of the first phase, and the upper edge of the large circle is embedded in the previous slot of the small circle. Finish the ends, seal the grooves, and insulate the pads. 2.1.4 Separate two slots, insert the small and large loops of the other group of coils of the first phase into the lower layer edge, and insert the upper layer edge into the empty slot in the front.

2.2 Crossed Winding Wire Insertion 2.2.1 First insert the lower layer edge of the first phase double coil, seal the slot (organize the conductors in the slot, insert the slot wedge), and the upper layer is not embedded for the time being. 2.2.2 Separate one slot, insert the lower edge of the second phase single circle, seal the slot, and the upper edge will not be embedded for the time being. 2.2.3 Insert the lower edge of the third phase double circle into two grooves. When the pitch is Y = 1-9, insert the upper edge into the first two grooves of the lower edge of the first phase double circle. Seal the groove and pad. Good phase insulation. 2.2.4 Separate another slot, insert the lower layer edge of the first phase single circle, and insert the upper layer edge into the empty slot (Y = 1-8), seal the slot, and pad the insulation between phases. 2.2.5 Insert two slots, insert the lower edge of the second phase with double turns. The upper edge should be inserted into the slot according to Y = 1-9, seal the slot, and cushion the insulation between phases. The rest of the coil can be inserted by analogy 2.1.2.1 ... 2.3 Chain winding wire 5.2.3.1 First insert the lower layer edge of the first phase and the first coil, seal the slot (organize the conductors in the slot, insert the slot wedge), and the upper layer is not embedded for the time being. 2.3.2 Separate a slot, insert the lower edge of the first coil of the second phase, seal the slot, and the upper edge will not be temporarily inserted. 2.3.3 Separate one slot, insert the lower edge of the first coil of the third phase, and the upper edge of the first phase and the lower edge of the first coil. In the previous slot occupied by the slot, seal the slot and insulate the pads. 2.3.4 Separate one slot, insert the lower layer edge of the second coil of the first phase, and arrange the upper layer edge into the slot, seal the slot, and isolate the pads from each other. 2.3.5 Separate one slot, insert the lower layer edge of the second phase and the second coil, and arrange the upper layer edge into the slot, seal the slot, and isolate the pads. And so on 1.1.1.1 ... embedded. 2.4 Double-layer superimposed wire 5.2.4.1 First insert the lower edge of the first pole phase group coil, cover it with interlayer insulation, and leave the upper edge unembedded for the time being, and then insert it into the slot with a through pin. Rubber hammer hitting. 5.2.4.2 Re-embed the second polar phase group (the method is the same as above). 2.4.3 Re-embed the third pole phase group (the method is the same as above), insert the upper layer edge according to the stipulated pitch of the drawing, seal the groove, and continue in this order.

Operation method of single-layer winding using backward threading process

3.1 Insert all coils of phase A first pole phase group with lead wires into the stator slots first. Only the lower edge is embedded, the other effective edge is not embedded.

3.2 Pass all the windings that are not embedded in the A phase from the middle of the B phase first pole phase group coil from the outside to the inside, and insert the B phase first pole phase group coils into the slot. Only the lower edge is embedded, the other effective edge is not embedded.

3.3 Pass all the windings that are not embedded in phase A and phase B together from the middle of the coils of the first-phase group of phase C from the outside to the inside, and insert the coils of the first-phase group of phase C into the slots. Pay attention not to twist together the phase A and B bridge lines.

3.4 Pass all the windings that are not embedded in phase B and phase C through the first bridge line of phase A, and then pass from the outside to the inside, and insert the coils of phase A and the second pole group into the slot.

3.5 Insert all windings of phase C and A that are not embedded through the second phase of the B phase from the outside to the inside, and insert the coils of the second phase of the B phase into the slot. Follow the steps above to analogously embed all the coils.

1 Slot insulation, slot wedge, interlayer insulation, where the coil windings expose the core, the lengths of both ends should be equal

2 The upper edge of the wire that is not embedded at the beginning should be well arranged. Pad the bottom with paper and gently flatten it by hand to avoid damaging the coil insulation.

3 The connection between the upper layer and the lower layer should be well arranged and embedded in the lower half of the coil to prevent the connection from bending and scratching the paint film, causing shorts between the turns.

4 When the interphase insulation is applied, it should cover the interlayer insulation and touch the wedge.

5 After inserting a coil (or a group of coils), the end of the coil should be pressed down or tapped lightly with a knock plate to make it slightly expand outward, so as to facilitate the coil coiling.

6 Insert the line carefully and adjust the line shape, stretch it to a distance greater than the pitch, straighten the line into the slot, and if necessary, divide it into several times.

7 When inserting a small phase angle, the two adjacent coils must not be in direct contact.

8 When the dimensions and specifications of the materials do not meet the drawings and technical standards, they shall not be used. When it is necessary to use it, it shall be used after obtaining the approval of the relevant departments and taking appropriate measures.

9 After inserting the wire, use an open-type tool to round the bell mouth, remove the cable, check whether the insulation between the phases is properly mated, and whether the wire ends are correct, and then paste the operator ID number for inspection.

1 Check whether the iron core and coil comply with the work instruction. The size and specifications of the materials used should comply with the drawings and technical standards.

2 Check that the coil pitch is in accordance with the drawing, and the connections between the coils should be correct.

3 The wires at the ends of the windings should be neatly arranged without serious crossover, and the shape of the insulation at the ends should meet the requirements.

4 Slot wedges shall have appropriate tightness, their ends shall not be cracked, they shall not be higher than the inner circle of the iron core, and they shall extend at equal lengths at both ends of the iron core.

5 The bottom of the slot should not be broken, and the wires should not be damaged. If the slot is broken, it must be filled with the same material as the slot insulation. The total number of broken: less than 36 slots of the motor, the break should not exceed three places; Motors larger than · 36 slots must not rupture more than four places, and must not rupture to the core position.

1 Do not use iron tools to directly contact the wires in the rule.

2 Insulated wires are not allowed to have damage to the insulation of the wires and cracked insulation at the bottom of the slot, otherwise they must be replaced again.

3 In the embedded wire, the slot insulation must be replaced when the slot break exceeds 7.5.

4 In the embedding wire, do not apply excessive force to the end to prevent damage to the insulation.

5 Do not roll the iron core or damage the coil insulation during the stacking process.

6 The work site should be kept clean and dry.

7 The stacking height of winding iron cores should not exceed 0.5 meters, so as to avoid damage to the wire package and the iron core.