CN113035603A - Special-shaped contact device of passive-triggered power electronic tap switch - Google Patents
Special-shaped contact device of passive-triggered power electronic tap switch Download PDFInfo
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- CN113035603A CN113035603A CN202110178148.4A CN202110178148A CN113035603A CN 113035603 A CN113035603 A CN 113035603A CN 202110178148 A CN202110178148 A CN 202110178148A CN 113035603 A CN113035603 A CN 113035603A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 45
- 230000003068 static effect Effects 0.000 claims description 91
- 238000000926 separation method Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000002679 ablation Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 26
- 238000010586 diagram Methods 0.000 description 9
- 238000010891 electric arc Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
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Abstract
The invention provides a special-shaped contact device of a passive triggering power electronic tap switch, which comprises: the main contact, the thyristor trigger contacts and the thyristor auxiliary contacts are connected with the transmission shaft, and are in rotating contact with different parts of the fixed contact along with the transmission shaft, so that the main contact, the thyristor trigger contacts and the thyristor auxiliary contacts are driven by the transmission shaft to rotate and respectively contact different parts of different fixed contacts, the passive trigger switching of the power electronic tap switch is realized, and by setting the shapes and initial positions of the contacts, electric arcs generated in the switching process can be reduced, the device cost is low, the control of the switching process is simple, and the stability is high.
Description
Technical Field
The invention relates to the technical field of power switches, in particular to a special-shaped contact device of a passive-triggered power electronic tap switch.
Background
Voltage is an important quality indicator in power systems. When the power system normally operates, the voltage changes, which causes the abnormal operation of the electric equipment, and directly affects the production and daily life, so the voltage regulation is one of the main tasks of the power system.
The on-load voltage regulation of the transformer is to regulate the voltage through a tap switch under the condition of no power failure, and the on-load voltage regulation of the transformer is to regulate the voltage through the tap switch under the condition of no power failure, in the prior art, a switching method capable of carrying out passive triggering on a power electronic tap switch exists, and the principle of the passive triggering is as follows:
referring to fig. 1, which is a schematic diagram of a power electronic tap changer in the prior art, A, B is two fixed contacts of the tap changer, MC is a main contact of the tap changer, VS1 and VS2 are thyristors, S1 and S3 are auxiliary contacts of the thyristors, S2 and S4 are trigger contacts of the thyristors, TR1 and TR2 are trigger resistors, and R is a transition resistor.
(1) When the device normally operates, the main contact MC is contacted with the static contact A to realize current carrying; the contacts S1, S2, S3 and S4 are connected with the fixed contact A through a mechanical switch.
(2) Before the tap switch is not switched, because A, MC and O are at the same potential, two ends of the thyristor are short-circuited, and no trigger current exists, and the thyristor VS1 and the thyristor VS2 are not conducted.
(3) When the tap changer starts to switch, the main contact MC needs to be controlled to leave the static contact a before the contacts S1, S2, S3 and S4. At this time, since the contacts S1, S2, S3, S4 are still connected to tap a, there will be a potential difference across the thyristor, which is the voltage at the tap of the distribution transformer.
(4) The potential difference further generates voltage drop at two ends of the thyristors VS1 and VS2, and trigger current can be provided for the thyristors through trigger resistance voltage division, so that the thyristors are switched on, an external power supply is not needed to trigger the thyristors in the switching-on process of the thyristors, and the passive triggering of the power electronic tap switch is realized.
However, the contact structure of the mechanical tap changer and the contact structure of the pure power electronic tap changer adopted by the existing power electronic tap changer cannot realize passive triggering switching.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the special-shaped contact device of the passively triggered power electronic tap switch, which can realize the contact switching of the passively triggered power electronic tap switch, reduce electric arcs in the switching process, and has high switching reliability and low cost.
The embodiment of the invention provides a special-shaped contact device of a passive triggering power electronic tap switch, which comprises: the thyristor trigger circuit comprises at least two fixed contacts, a main contact, two thyristor trigger contacts, two thyristor auxiliary contacts and a transmission shaft;
all the static contacts are arc-shaped conducting strips with the same radius, are distributed on a circumference taking the rotating shaft as the center of a circle, and form a cylindrical structure around the rotating shaft;
the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all connected to the transmission shaft, rotate along with the transmission shaft and are in sliding contact with the fixed contact, the rotating tracks of the two thyristor trigger contacts are the same, and the rotating tracks of the two thyristor auxiliary contacts are the same;
each static contact comprises: a first portion in contact with the main contact, a second portion in contact with the two thyristor trigger contacts, and a third portion in contact with the two thyristor auxiliary contacts; the length of the first portion is less than the length of the second portion, which is less than the length of the third portion;
the initial position of the main contact is in contact with the first fixed contact, the distance between the initial position of the main contact and the first edge line closest to the main contact is a first distance, and the edge lines of the first part parallel to the transmission shaft are the first edge lines;
the initial positions of the two thyristor trigger contacts are distributed on two sides of a center line parallel to the first fixed contact and the transmission shaft; the initial position of one thyristor trigger contact is in contact with the first fixed contact, the distance between the initial position of one thyristor trigger contact and a second edge line closest to the initial position of one thyristor trigger contact is recorded as a second contact distance, and the edge lines of the second part parallel to the center line are the second edge lines; the initial position of the other thyristor trigger contact is not in contact with the first fixed contact, and the distance between the other thyristor trigger contact and the second edge line closest to the initial position is recorded as a second separation distance;
the initial positions of the two thyristor auxiliary contacts are distributed on two sides of the central line, the distance between one thyristor auxiliary contact and a nearest third edge line is a third distance, and the edge lines of the third part parallel to the transmission shaft are the third edge lines;
wherein the first distance is less than the second contact distance, the second contact distance is less than the third distance, the second separation distance is greater than the first distance, and the second separation distance is less than the second contact distance.
As a preferred mode, the first portion of the first fixed contact, the second portion of the first fixed contact, and the third portion of the first fixed contact are connected in an equipotential manner.
As a preferred mode, the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts rotate around a transmission shaft at the same angular speed;
as a preferred mode, the maximum contact area between the main contact and the fixed contact is the largest, the maximum contact area between the thyristor auxiliary contact and the first fixed contact is the largest, and the maximum contact area between the thyristor trigger contact and the first fixed contact is the smallest.
Preferably, the two side edges of the first portion of the first fixed contact are provided with transition portions made of arc ablation resistant material.
As a preferable mode, edge lines at two sides of the three parts of the first fixed contact are provided with buffering inclined planes with preset slopes.
The invention provides a special-shaped contact device of a passive triggering power electronic tap switch, which comprises: the thyristor trigger contact is contacted with the second part of the static contact, the thyristor auxiliary contact is contacted with the third part of the static contact, and the length of the three parts is set so that the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are driven by the transmission shaft to rotate, and the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are respectively contacted with different parts of different static contacts. The contact device realizes the control of the passive triggering switching of the power electronic tap switch through the rotation of the transmission shaft, and the contact and switching process of the contact is more stable through the design of the transition part and the buffering inclined plane; through the design to the special-shaped structure of contact device, can avoid main contact and one of them thyristor trigger contact not simultaneous contact static contact, reduce the production of the electric arc in the switching process, the control of switching process is simple, and switching process stability is high, and the device cost is lower.
Drawings
Fig. 1 is a schematic diagram of a power electronic tap changer device of the prior art;
fig. 2 is a schematic structural view of a preferred embodiment of a profiled contact arrangement of a passively triggered power electronic tap changer according to the present invention;
fig. 3 is a schematic structural view of another preferred embodiment of the profiled contact means of a passively triggered power electronic tap changer according to the present invention;
fig. 4 is a schematic structural diagram of a stationary contact of several preferred embodiments of a profiled contact device of a passively triggered power electronic tap switch according to the present invention;
fig. 5 is a schematic view of the initial position of each contact in a further preferred embodiment of the profiled contact means of a passively triggered power electronic tap changer according to the present invention;
fig. 6 is a timing diagram for the switching of a further preferred embodiment of the profiled contact means of a passively triggered power electronic tap changer according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a special-shaped contact device of a passive triggering power electronic tap switch, which comprises: the thyristor trigger circuit comprises at least two fixed contacts, a main contact, two thyristor trigger contacts, two thyristor auxiliary contacts and a transmission shaft;
all the static contacts are arc-shaped conducting strips with the same radius, are distributed on a circumference taking the rotating shaft as the center of a circle, and form a cylindrical structure around the rotating shaft;
the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all connected to the transmission shaft, rotate along with the transmission shaft and are in sliding contact with the fixed contact, the rotating tracks of the two thyristor trigger contacts are the same, and the rotating tracks of the two thyristor auxiliary contacts are the same;
each static contact comprises: a first portion in contact with the main contact, a second portion in contact with the two thyristor trigger contacts, and a third portion in contact with the two thyristor auxiliary contacts; the length of the first portion is less than the length of the second portion, which is less than the length of the third portion;
the initial position of the main contact is in contact with the first fixed contact, the distance between the initial position of the main contact and the first edge line closest to the main contact is a first distance, and the edge lines of the first part parallel to the transmission shaft are the first edge lines;
the initial positions of the two thyristor trigger contacts are distributed on two sides of a center line parallel to the first fixed contact and the transmission shaft; the initial position of one thyristor trigger contact is in contact with the first fixed contact, the distance between the initial position of one thyristor trigger contact and a second edge line closest to the initial position of one thyristor trigger contact is recorded as a second contact distance, and the edge lines of the second part parallel to the center line are the second edge lines; the initial position of the other thyristor trigger contact is not in contact with the first fixed contact, and the distance between the other thyristor trigger contact and the second edge line closest to the initial position is recorded as a second separation distance;
the initial positions of the two thyristor auxiliary contacts are distributed on two sides of the central line, the distance between one thyristor auxiliary contact and a nearest third edge line is a third distance, and the edge lines of the third part parallel to the transmission shaft are the third edge lines;
wherein the first distance is less than the second contact distance, the second contact distance is less than the third distance, the second separation distance is greater than the first distance, and the second separation distance is less than the second contact distance.
In the specific implementation of this embodiment, referring to fig. 2, a schematic structural diagram of a preferred embodiment of a special-shaped contact device of a passive-triggered power electronic tap switch provided by the present invention is shown, where 6 static contacts of the contact device are conductive sheets having the same radius and arc-shaped, and are respectively a static contact a, a static contact B, a static contact C, a static contact D, a static contact E, and a static contact F, and the 6 static contacts are distributed on a circumference with a transmission shaft as a circle center and have the same radius;
the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all connected to a transmission shaft, rotate along with the transmission shaft and are respectively contacted with 6 static contacts through rotation;
it should be noted that, in this embodiment, the number of the given static contacts is 6, and in other embodiments, the number of the static contacts is set according to actual needs;
referring to fig. 3, which is a schematic structural view of another preferred embodiment of the profiled contact device of the passively triggered power electronic tap changer according to the embodiment of the present invention, the main contact MC, the thyristor trigger contact S2, the thyristor trigger contact S4, the thyristor auxiliary contact S1 and the thyristor auxiliary contact S3 are connected to a transmission shaft, wherein the thyristor trigger contact S2 and the thyristor trigger contact S4 are fixed at the same height of the transmission shaft, therefore, when the thyristor auxiliary contact MC, the two thyristor trigger contacts S2/S4 and the two thyristor auxiliary contacts S1/S3 are fixed at different heights of the transmission shaft, and when the thyristor auxiliary contact MC, the two thyristor trigger contacts S2/S4 and the two thyristor auxiliary contacts S1/S3 rotate around the transmission shaft, the thyristor auxiliary contact S1 and the thyristor auxiliary contact S3 are in contact with the static contact A to form three different tracks;
the static contact A comprises a first part in contact with the main contact, a second part in contact with the two thyristor trigger contacts and a third part in contact with the two thyristor auxiliary contacts; the length of the first part is smaller than that of the second part, the length of the second part is smaller than that of the third part, the three parts are in random up and down sequence to form static contacts with different structures, but the three parts of all the static contacts are in the same arrangement sequence.
The upper and lower sequence of the first part, the second part and the third part of the static contact corresponds to the positions of the main contact, the thyristor trigger contact and the thyristor auxiliary contact.
It should be noted that the structure of the static contact provided in this embodiment is a structure in which the first portion is at the uppermost, the second portion is in the middle, and the third portion is at the lowermost arrangement order, which illustrates the structure of the contact device provided in the present invention, but the first portion, the second portion, and the third portion of the contact head have a plurality of different sorting manners in the vertical order, the vertical order of the three portions is different, and the positions of the main contact, the thyristor trigger contact, and the thyristor auxiliary contact are also different; after the positions of the main contact, the thyristor trigger contact and the thyristor auxiliary contact are determined, the sequence of all the static contacts should be consistent and correspond to the sequence of all the static contacts, which is not described herein again.
It should be noted that, in the embodiment of the present invention, the thicknesses of the first portion, the second portion, and the third portion of the fixed contact are the same, and the distances from the first portion, the second portion, and the third portion of the fixed contact to the transmission shaft are the same, at this time, the lengths of the main contact, the thyristor trigger contact, and the thyristor auxiliary contact are equal, but in other embodiments, the thicknesses of the three portions may be different, and the thicknesses from the transmission shaft are also different, at this time, the lengths of the main contact, the thyristor trigger contact, and the thyristor auxiliary contact need to be controlled, so that the main contact, the thyristor trigger contact, and the thyristor auxiliary contact are respectively in contact with the three portions of the fixed contact.
It should be noted that, in this embodiment, only the lengths of the three portions of the static contact are limited, and the widths of the three different portions are not limited, and in the specific implementation, the widths of the three portions may be the same or different according to the actual requirements, and have no influence on the specific implementation of the scheme.
Fig. 4 is a front view of several preferred embodiments of a stationary contact of a special-shaped contact device of a passively triggered power electronic tap switch, where fig. a, b, and c are schematic structural views of three preferred embodiments of a stationary contact. The static contact configuration of fig. a, with the second portion in the middle, the first portion on the upper side of the second portion, and the third portion on the lower side of the second portion; the static contact structure shown in fig. b has a first portion in the middle, a second portion on the upper side of the first portion, and a third portion on the lower side of the first portion; the static contact structure shown in fig. c has a third portion in the middle, a second portion on the upper side of the third portion, and a first portion on the lower side of the third portion; when the three parts of the static contact are arranged in different orders, the positions of the main contact, the thyristor trigger contact and the thyristor auxiliary contact respectively correspond to the first part, the second part and the third part of the static contact.
It should be noted that, in this embodiment, only schematic structural diagrams of three types of fixed contacts are given, and in other embodiments, the fixed contact has other structures, which are consistent with the principle of this embodiment and are within the protection scope of this embodiment, and are not described herein again.
In practical implementation, referring to fig. 5, it is a schematic diagram of initial positions of respective contacts in another preferred embodiment of the special-shaped contact device of the passively triggered power electronic tap switch provided by the present invention, where the initial position of the main contact MC is located between an edge line of the first portion of the fixed contact a and the center line, and is at a distance L1 from an edge line of the closest first portion;
the initial positions of the thyristor trigger contact S2 and the thyristor trigger contact S4 are distributed on two sides of a center line of the static contact A parallel to the transmission shaft; the initial position of the thyristor trigger contact S2 is in contact with the static contact A, and the distance between the initial position and the edge line of the nearest second part is L2; the initial position of the thyristor trigger contact S4 is not in contact with the first fixed contact A, and the distance from the edge of the nearest second part is marked as L2';
the thyristor trigger contacts S4 and S3 are respectively positioned on two sides of the center line of the third part of the static contact A, and the distance between the thyristor trigger contact S4 and the edge of the third part is L3;
in order to ensure that the main contact MC is disconnected with the static contact A firstly, then the thyristor trigger contact S2 is disconnected with the main contact MC, and the thyristor auxiliary contact S1 is disconnected with the static contact A finally, the conditions that L1 is greater than L2 and L3 are met, so that in the switching process, the contacts can be switched according to a certain sequence, and the switching requirement of passive starting of the tap changer is met;
in the whole process, the main contact MC and the thyristor trigger contact S4 are not simultaneously contacted with the static contact A, and the requirements that L1 is less than L2' < L2 are met; when the main contact MC and the static contact A are separated to the middle that the thyristor trigger contact S2 is separated from the static contact A, the thyristor trigger contact S4 needs to be in contact with the static contact A, the conduction time of an S2 branch is prolonged in the process, the distance between the main contact MC and the static contact A is increased, and the generation of electric arcs in the switching process is reduced through the design of a special-shaped structure of a contact device;
the invention provides a special-shaped contact device of a passive triggering power electronic tap switch, which comprises: the thyristor trigger contact is contacted with the second part of the static contact, the thyristor auxiliary contact is contacted with the third part of the static contact, and the length of the three parts is set so that the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are driven by the transmission shaft to rotate, and the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are respectively contacted with different parts of different static contacts. The contact device realizes the control of the passive triggering switching of the power electronic tap switch through the rotation of the transmission shaft, and through the design of the special-shaped structure of the contact device, the main contact and one thyristor triggering contact of the main contact can be prevented from not contacting with a static contact simultaneously, so that the generation of electric arcs in the switching process is reduced, the control of the switching process is simple, the stability of the switching process is high, and the device cost is lower.
In another embodiment of the present invention, the first portion of the first fixed contact, the second portion of the first fixed contact, and the third portion of the first fixed contact are connected in an equipotential manner.
In a further embodiment provided by the invention, the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts rotate around a transmission shaft at the same angular speed;
in another embodiment of the present invention, the maximum contact area between the main contact and the first fixed contact is the largest, the maximum contact area between the thyristor auxiliary contact and the first fixed contact is the largest of the main contact and the fixed contact, and the maximum contact area between the thyristor trigger contact and the first fixed contact is the smallest of the thyristor trigger contact and the fixed contact.
In another embodiment of the present invention, two side edges of the first portion of the first fixed contact are provided with transition portions made of arc ablation resistant material.
In another embodiment of the present invention, edge lines at two sides of three portions of the first fixed contact have buffering inclined planes with preset slopes.
In specific implementation, referring to fig. 5, in an initial state, the main contact MC contacts the first portion of the fixed contact a, the thyristor trigger contact S2 contacts the second portion of the fixed contact a, the thyristor trigger contact S4 does not contact the fixed contact a, the thyristor trigger contacts S1, S3 contact the third portion of the fixed contact a, and in an initial position, the main contact MC needs to carry current for a long time, and in a switching process, the thyristor auxiliary contacts S1, S3 need to carry current separately in sequence, and the thyristor trigger contacts S2, S4 only need to provide a smaller trigger current, so that in specific implementation, the contact area between the fixed contact a and the main contact MC is the largest, the contact area between the fixed contact a and the thyristor auxiliary contacts S3, S1 is the largest as compared with the contact area between the main contact and the fixed contact, and the contact area between the fixed contact a and the thyristor trigger contacts S2, S4 is the smallest;
the differential current-carrying area is set according to the current-carrying strength of different contacts, so that the manufacturing cost can be reduced on the premise of ensuring the stability and safety of the switching process;
the main contact, the thyristor trigger contact and the thyristor auxiliary contact are connected through a transmission shaft, have the same angular speed by rotating around the transmission shaft, and have the same sequence when contacting with different static contacts every time, so that the switching time sequence of the tap switch is kept unchanged;
the three different parts of each static contact are connected in an equipotential manner, but the potentials of the different static contacts are not necessarily the same, and the tapping switch can be switched on the potentials of the different static contacts by contacting the main contact, the thyristor trigger contact and the thyristor auxiliary contact with the different static contacts;
in a preferred embodiment of the present invention, two transition portions are disposed on two side edges of the first portion of the static contact a, and the transition portions are made of arc erosion resistant materials, such as tungsten-copper alloy, silver-based electrical materials, and the like.
The edge lines at two sides of the three parts of the static contact A are provided with certain gradients to form a buffer surface, so that the impact of the main contact, the thyristor trigger contact and the thyristor auxiliary contact when being in contact with the first static contact can be buffered, and the three parts can be different in specific gradient size;
as one of the preferable modes, the size of the buffer slope can be set according to the contact area of the main contact, the thyristor trigger contact and the thyristor auxiliary contact with the fixed contact, the main contact and the thyristor auxiliary contact with large contact areas are provided with the buffer slope with large area, a smaller slope can be set, the thyristor trigger contact with small contact area is provided, the area of the required buffer slope is smaller, and a larger slope can be set.
As another preferred mode, the gradient size and the area of the buffering inclined plane can be set according to actual needs, normal switching between the contacts is not affected, and collision of contact switching can be buffered.
By setting the initial positions of a main contact, a thyristor trigger contact and a thyristor auxiliary contact of the tap switch and rotating at the same angular speed through a transmission shaft, the switching time sequence requirement of the passively triggered power electronic tap switch can be met by contacting different static contacts, and the requirement of tapping and switching different voltages can be met;
in the implementation of the present invention, referring to fig. 1, it is a schematic circuit diagram of a preferred embodiment of a passively triggered power electronic tap changer provided in the present invention, and the circuit includes: the static contact A, the static contact B, the main contact MC, the thyristor VS1, the thyristor VS2, the thyristor auxiliary contact S3, the thyristor auxiliary contact S1, the thyristor trigger contact S2, the thyristor trigger contact S4, the resistor R, the first resistor TR1, the second resistor TR2, the third resistor TR3 and the fourth resistor TR4, the static contact A and the static contact B are two adjacent static contacts, the connection relation of the tap switch in the initial state is shown in the figure, the static contact B is suspended, the static contact A is connected with the output end O through the main contact MC, the thyristor auxiliary contact S1 is connected with the first end of the thyristor VS1, the second end of the thyristor VS1 is connected with the output end O through the resistor R, the thyristor auxiliary contact S2 is connected with the first end of the thyristor VS2, the second end of the thyristor VS2 is connected with the output end O, one end of the thyristor trigger contact S2 is connected with the static contact A, the other end of the trigger contact S2 is connected with the, a second terminal of the first resistor TR1 is connected with a first terminal of the second resistor TR2 and a trigger terminal of the thyristor VS1, and a second terminal of the second resistor TR2 is connected with the output terminal O; one end of the thyristor trigger contact S4 is suspended, the other end of the thyristor trigger contact S4 is connected with the first end of the third resistor TR3, the second end of the third resistor TR3 is connected with the first end of the fourth resistor TR4 and the trigger end of the thyristor VS1, and the second end of the fourth resistor TR4 is connected with the output end O;
referring to fig. 6, it is a switching timing diagram of another preferred embodiment of the profiled contact device of the passively triggered power electronic tap changer provided by the present invention, where the switching timing of the passive triggering of the power electronic tap changer is as follows:
in the initial position, MC, S1, S2 and S3 are connected with the contact A, and S4 is not connected with the contact A as shown in the figure I;
the main contact MC is disconnected from the static contact A, as shown in figure II;
the thyristor trigger contact S4 establishes a connection with the stationary contact a, as shown in fig. iii;
the thyristor trigger contact S2 disconnects from the stationary contact a, as shown in fig. iv;
the thyristor auxiliary contact S1 is disconnected from the stationary contact a, as shown in fig. v;
the thyristor auxiliary contact S1 is established in the connection of the stationary contact B, as shown in fig. vi;
the thyristor trigger contact S2 establishes a connection with the stationary contact B, as shown in fig. vii;
the thyristor trigger contact S4 disconnects from the stationary contact a, as shown in fig. viii;
the main contact MC is connected with the static contact B as shown in a figure IX;
the thyristor auxiliary contact S3 is disconnected from the stationary contact a, as shown in fig. x;
the thyristor auxiliary contact S3 is established in connection with the stationary contact B, as shown in fig. xi;
at the moment, the tap changer is completely switched from the joint of the static contact A to the static contact B to complete a complete switching process, and in the whole process, the main contact MC does not contact the static contact A with the thyristor trigger contact S4 at the same time; if the S4 initially contacts the fixed contact, after the main contact MC leaves, the thyristors connected to the thyristor trigger auxiliary S1 and the thyristor trigger auxiliary S3 contacts are both turned on, because the S1 branch is connected in parallel with the S3 branch, the voltage drop of the S2 branch is the same as that of the S3 branch, and because the S1 branch has no transition resistance, the voltage difference applied between the main contact MC and the fixed contact a is small; however, when the thyristor trigger auxiliary S2 leaves the fixed contact a, the thyristor of the S1 branch is turned off, and at this time, the load current flows through the S2 branch, and because the S2 branch has the transition resistance, a large voltage drop is generated and applied between the main contact MC and the fixed contact a, and at this time, an arc may be generated between the main contact MC and the fixed contact a under the influence of the voltage difference. Therefore, in order to reduce the influence, in the initial position, the contact between the thyristor trigger auxiliary S4 and the main contact a is set not to be in contact with the static contact a, when the main contact MC and the static contact a are separated to the point where the thyristor trigger contact S2 is separated from the static contact a, the thyristor trigger contact S4 needs to be in contact with the static contact a, the conduction time of the S2 branch is prolonged, the distance between the main contact MC and the static contact a is also increased, so that the insulation strength is also increased, the probability of electric arc generation is reduced, the electric arc generation in the switching process is reduced, and then the process of switching from the static contact B to the static contact C adjacent to the static contact B is the same as the process, which is not repeated herein.
The invention provides a special-shaped contact device of a passive triggering power electronic tap switch, which comprises: at least two static contacts, a main contact, two thyristor trigger contacts, two thyristor auxiliary contacts and a transmission shaft, wherein the at least two static contacts are distributed on the circumference taking the transmission shaft as the center, the main contact, the thyristor trigger contacts and the thyristor auxiliary contacts are fixed on the transmission shaft, along with the contact of the transmission shaft and different parts of the at least two static contacts, the main contact is contacted with a first part of the static contacts, the thyristor trigger contacts are contacted with a second part of the static contacts, and the thyristor auxiliary contacts are contacted with a third part of the static contacts, by setting the lengths of the three parts of the static contact, setting the initial positions and the rotation angular speeds of the main contact, the thyristor auxiliary contact and the thyristor trigger contact, the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts can be driven by the transmission shaft to rotate and respectively contact different parts of different static contacts according to a certain sequence. The contact device can realize that the power electronic switch is switched to different static contacts by controlling the rotation of the rotating shaft, and the established switching time sequence is kept, and through the design of the special-shaped structure of the contact device, the main contact and one of the thyristor trigger contacts can be prevented from not contacting the static contacts at the same time, the generation of electric arcs in the switching process is reduced, the control of the switching process is simple, the stability of the switching process is high, and the cost of the device is lower.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A profiled contact arrangement for a passively triggered power electronic tap changer, the contact arrangement comprising: the thyristor trigger circuit comprises at least two fixed contacts, a main contact, two thyristor trigger contacts, two thyristor auxiliary contacts and a transmission shaft;
all the static contacts are arc-shaped conducting strips with the same radius, are distributed on a circumference taking the rotating shaft as the center of a circle, and form a cylindrical structure around the rotating shaft;
the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts are all connected to the transmission shaft, rotate along with the transmission shaft and are in sliding contact with the fixed contact, the rotating tracks of the two thyristor trigger contacts are the same, and the rotating tracks of the two thyristor auxiliary contacts are the same;
each static contact comprises: a first portion in contact with the main contact, a second portion in contact with the two thyristor trigger contacts, and a third portion in contact with the two thyristor auxiliary contacts; the length of the first portion is less than the length of the second portion, which is less than the length of the third portion;
the initial position of the main contact is in contact with the first fixed contact, the distance between the initial position of the main contact and the first edge line closest to the main contact is a first distance, and the edge lines of the first part parallel to the transmission shaft are the first edge lines;
the initial positions of the two thyristor trigger contacts are distributed on two sides of a center line parallel to the first fixed contact and the transmission shaft; the initial position of one thyristor trigger contact is in contact with the first fixed contact, the distance between the initial position of one thyristor trigger contact and a second edge line closest to the initial position of one thyristor trigger contact is recorded as a second contact distance, and the edge lines of the second part parallel to the center line are the second edge lines; the initial position of the other thyristor trigger contact is not in contact with the first fixed contact, and the distance between the other thyristor trigger contact and the second edge line closest to the initial position is recorded as a second separation distance;
the initial positions of the two thyristor auxiliary contacts are distributed on two sides of the central line, the distance between one thyristor auxiliary contact and a nearest third edge line is a third distance, and the edge lines of the third part parallel to the transmission shaft are the third edge lines;
wherein the first distance is less than the second contact distance, the second contact distance is less than the third distance, the second separation distance is greater than the first distance, and the second separation distance is less than the second contact distance.
2. The special-shaped contact device of the passive-triggering power electronic tap switch of claim 1, wherein the first portion of the first stationary contact and the second portion of the first stationary contact are connected to the third portion of the first stationary contact at equal potential.
3. The profiled contact arrangement of a passively triggered power electronic tap switch according to claim 1, wherein the main contact, the two thyristor trigger contacts and the two thyristor auxiliary contacts rotate around a drive shaft at the same angular velocity.
4. The special-shaped contact device of the passive-triggering power electronic tap switch of claim 1, wherein a maximum contact area between the main contact and the stationary contact is the largest, a maximum contact area between the thyristor auxiliary contact and the first stationary contact is the largest, and a maximum contact area between the thyristor trigger contact and the first stationary contact is the smallest.
5. The special-shaped contact device of a passive triggering power electronic tap switch according to claim 1, characterized in that the two side edges of the first portion of the first stationary contact are provided with transition portions made of arc ablation resistant material.
6. The special-shaped contact device of the passive-triggering power electronic tap switch of claim 1, wherein the edge lines at two sides of the three parts of the first fixed contact are provided with buffering inclined planes with preset slopes.
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| CN202110178148.4A CN113035603B (en) | 2021-02-08 | 2021-02-08 | Special-shaped contact device of passive triggering power electronic tap switch |
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| CN202110178148.4A CN113035603B (en) | 2021-02-08 | 2021-02-08 | Special-shaped contact device of passive triggering power electronic tap switch |
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| CN113035603B CN113035603B (en) | 2022-06-14 |
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| WO2022001362A1 (en) * | 2020-06-29 | 2022-01-06 | 南方电网科学研究院有限责任公司 | Passive triggered-power electronic tap-changer device and contact device |
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| CN113035603B (en) | 2022-06-14 |
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