Five-pin polarity switch dedicated to transformer voltage regulator

Abstract

The present invention relates to the technical field of transformer power distribution and transformation, and in particular to a five-pin polarity switch specially used for transformer voltage regulating switches. A five-point polarity conversion switch for a transformer voltage regulating switch is provided, comprising five connecting pins, two linkage plates, a connecting pin mounting seat and a linkage plate driving device; the five connecting pins are equidistantly distributed on the connecting pin mounting seat along a straight line, and two circular linkage plates are mounted on the linkage plate driving device, distributed along the straight line direction where the five connecting pins are located. The linkage plate slides along the straight line direction to form two connection relationships with the five connecting pins, thereby realizing the polarity switching of the voltage regulating branch in the transformer voltage regulating switch circuit. Compared with conventional polarity switches, the use of the present invention in the voltage regulating circuit can reduce the number of voltage regulating branches, simplify the structure, reduce the cost of the transformer voltage regulating switch, and improve the integration and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of transformer power distribution and transformation, in particular to a five-pin polarity switch specially used for a transformer voltage regulating switch. Background Art

[0002] Polarity conversion switches are often used in voltage regulation circuits to form forward and reverse control circuits. For example, the Chinese invention patent application number CN201910634391.5 discloses a "staggered parallel nine-speed transformer on-load voltage regulation circuit with polarity conversion", which consists of a main winding, a voltage regulating winding, a rated voltage branch, a transition switching unit, and five voltage regulating branches. A polarity conversion switch is provided between the main winding and the voltage regulating winding, and the forward and reverse voltage regulation is achieved by adjusting the connection end of the independent contact of the polarity conversion switch. The above-mentioned polarity conversion switch includes a common contact and two independent contacts. The tap at the output end of the main winding is connected to the common contact of the polarity conversion switch, and the two independent contacts of the polarity conversion switch are respectively connected to the two end taps of the voltage regulating winding. When the polarity reversing switch is in the upper-end connected state, the polarity of the voltage regulating winding connected to the circuit is the same as the polarity of the main winding, and the circuit can perform positive voltage regulation. When the polarity reversing switch is in the lower-end connected state, the polarity of the voltage regulating winding connected to the circuit is opposite to that of the main winding, and the circuit can perform reverse voltage regulation. However, because the above-mentioned polarity reversing switch has only one common contact and two independent contacts, it requires five voltage regulating branches for regulation in a nine-speed voltage regulating circuit. In contrast, in the Chinese invention patent publication number: CN110212830A, "A Five-speed Transformer On-load Voltage Regulating Circuit with Polarity Reversal," three voltage regulating branches are required for regulation in the five-speed voltage regulating circuit. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a five-pin polarity changeover switch for a transformer voltage regulating circuit. The five-pin polarity changeover switch used in the transformer voltage regulating switch can reduce the number of voltage regulating branches of the transformer of the same gear in the prior art, simplify the structure, and reduce the cost of the transformer.

[0004] To achieve the above objectives, the present invention employs a technical solution comprising: a pentagonal polarity reversing switch for a transformer voltage regulator, comprising five connecting pins, two linkage plates, a connecting pin mounting base, and a linkage plate driving device. The five connecting pins are spaced apart along a straight line on the connecting pin mounting base, namely the first, second, third, fourth, and fifth connecting pins. Two circular linkage plates are mounted on the linkage plate driving device, adjacent to each other along the line of the five connecting pins, namely the left linkage plate and the right linkage plate, with the spacing between the linkage plates being twice the spacing between the connecting pins. The linkage plate driving device comprises a retaining groove, a push rod, a U-shaped bracket, and an electromagnetic driver. The linkage plate is mounted on the push rod via a retaining groove with an internal spring. The push rod is restrained by a pair of U-shaped brackets mounted on a base plate and is axially slidable. One end of the push rod is connected to the electromagnetic driver. The linkage plates move synchronously to form two connection structures: a forward voltage regulating branch connection structure and a reverse voltage regulating branch connection structure. Each linkage plate simultaneously conducts current to its two corresponding connecting pins. Since the five connecting pins are distributed in a straight line and the two linkage plates are arranged adjacent to the connecting pins in parallel, the electromagnetic driver can push the push rod to drive the linkage plate to slide in a straight line, thereby realizing the switching of the two connection relationships between the linkage plate and the five connecting pins.

[0005] Furthermore, the first connecting pin is connected to the output tap of the lower side of the voltage regulating winding in the transformer voltage regulating circuit, the second connecting pin is connected to a voltage regulating branch in the transformer voltage regulating circuit, and the other voltage regulating branches in the transformer voltage regulating circuit are connected to the output taps of the corresponding voltage regulating winding branches in the transformer voltage regulating circuit, the third connecting pin is connected to the upper input tap of the voltage regulating winding in the transformer voltage regulating circuit, the fourth connecting pin is connected to the output tap of the main winding in the transformer voltage regulating circuit, and the fifth connecting pin is connected to the output tap of the lower side of the voltage regulating winding in the transformer voltage regulating circuit. The limit transfer switch forms two connection relationships with the synchronous sliding of the two linkage pieces. The first connection relationship is that the left linkage piece simultaneously connects the first and second connection pins, and the right linkage piece simultaneously connects the third and fourth connection pins; the second connection relationship is that the left linkage piece simultaneously connects the second and third connection pins, and the right linkage piece simultaneously connects the fourth and fifth connection pins.

[0006] Of the two connection relationships mentioned above, the first connection relationship realizes the boost structure of the positive-connected voltage-regulating branch, and the second connection relationship realizes the step-down structure of the reverse-connected voltage-regulating branch. When the rated voltage is supplied, it is maintained at the middle gear, thereby realizing smooth switching of the voltage-regulating circuit without power outage.

[0007] In the above structure, the polarity conversion switch realizes two circuit connection structures through a double linkage structure. The two circuit connection structures correspond to the positive connection, reverse connection and non-connection of the four voltage regulating branches, which can realize the switching of nine voltage levels, and reduce one voltage regulating branch compared with the existing technology; corresponding to the positive and reverse connection of two voltage regulating branches, it can realize the switching of five voltage levels, which can also reduce one voltage regulating branch compared with the three voltage regulating branches in the existing technology, thereby simplifying the overall structure of the voltage regulating circuit and reducing costs.

[0008] The five-pin polarity switch of the present invention not only simplifies the circuit structure, but also has a higher structural integration than the solution using multiple ordinary polarity switches. Since the two linkage plates move synchronously, only one set of operating drive device is required, and the failure rate is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The figure is a schematic diagram of an embodiment of a five-speed transformer voltage regulating switch using the five-pin polarity switch of the present invention.

[0010] Figure 2 This is a structural diagram of the five-pin polarity switch of the present invention.

[0011] Figure 3 a and b are respectively the top view and the front view of the push rod in the five-pin polarity switch of the present invention.

[0012] Figure 4 a, b, and c are respectively a front view, a left view, and a top view of the U-shaped bracket in the five-pin polarity switch of the present invention.

[0013] Figure 5 for Figure 1 Circuit connection diagram of the illustrated embodiment. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings, taking the application of the five-pin polarity switch of the present invention to a five-speed transformer voltage regulating switch as an example.

[0015] Reference Figure 1 Figure 4 shows a five-speed transformer voltage regulator switch, comprising a housing (not shown), a base plate 100, a five-pin polarity switch Kj, a vacuum interrupter module, a protective resistor 33, and a switch operating mechanism 34. The vacuum interrupter module comprises four parallel-mounted vacuum interrupters K0, Ke, Km, and K1, and components for mounting and securing the vacuum interrupters. The switch operating mechanism 34 controls the individual vacuum interrupters to achieve the desired on / off state combination. The detailed structure is omitted here.

[0016] The five-pin polarity switch includes five connecting pins 6, two linkage plates 11 and 12, a connecting pin mounting base 10 and a linkage plate driving device; the five connecting pins are spaced apart along a straight line on the connecting pin mounting base 10, and two circular linkage plates are mounted on the linkage plate driving device, and the connection direction of the linkage plates is parallel to the straight line on which the five connecting pins are located; the linkage plate driving device includes a limit groove 14, a push rod 20, a pair of U-shaped brackets 21 and an electromagnetic driver 24; the linkage plate is mounted on the push rod 20 through the limit groove 14 with a built-in spring, and the push rod 20 is limited in the up and down movement by a pair of U-shaped brackets 21 mounted on the bottom plate. One end of the push rod is limited in the sliding groove of the limit bracket 21 on the left side by a pin, and the other end is connected to the electromagnetic driver 24 and can slide axially;

[0017] Reference Figure 5 The first connecting pin 1 is connected to the fifth connecting pin 5 and the lower tap X3 of the voltage regulating coil L2 in the voltage regulating winding. The second connecting pin 2 is connected to the fixed terminal of the vacuum interrupter Km. The third connecting pin 3 is connected to the upper tap X1 of the voltage regulating coil L1 in the voltage regulating winding. The fourth connecting pin 4 is connected to the lower tap of the main winding L and the fixed terminal of the vacuum interrupter Ke. The tap X2 between the voltage regulating coils L1 and L2 in the voltage regulating winding is connected to the fixed terminal of the vacuum interrupter K1. The upper tap of the main winding L is connected to the input terminal A of the entire voltage regulating switch circuit. The protective resistor 33 (R in the circuit diagram) and the vacuum interrupter K0 are connected in parallel to form a transition switching unit, which protects the circuit during switching. In this transition switching unit, the active terminal of the vacuum interrupter K0 is connected to the active terminals of the vacuum interrupters Km and Ke and the output terminal X0 of the entire voltage regulating switch circuit, and the fixed terminal of the vacuum interrupter K0 is connected to the active terminal of the vacuum interrupter K1.

[0018] Combine Figure 5 The correspondence between the polarity switch Kj, the combination state of each on-off switch and each gear of the voltage regulating circuit is as follows:

[0019] The first linkage structure is that the linkage piece 11 connects the connection pin 1 and the connection pin 2 at the same time, and the linkage piece 12 connects the connection pin 3 and the connection pin 4 at the same time. The status of each gear switch is as follows

[0020] Gear 3: Ke is closed, K0 is disconnected, L1 and L2 are not connected to the circuit, and rated voltage is used for power supply;

[0021] Gear 4: Ke is disconnected, K1 is closed, K0 is closed, and L1 is connected to the circuit;

[0022] Level 5: Ke is disconnected, Km is closed, K0 is disconnected, L1 and L2 are connected to the circuit;

[0023] The second linkage structure is that the linkage piece 11 connects the connection pins 2 and 3 at the same time, and the linkage piece 12 connects the connection pins 4 and 5 at the same time. The status of each gear switch is as follows

[0024] Gear 3: Ke is closed, K0 is disconnected, L1 and L2 are not connected to the circuit, and rated voltage is used for power supply;

[0025] Second gear: Ke is disconnected, K1 is closed, K0 is closed, and L2 is reversely connected to the circuit;

[0026] First gear: Ke is disconnected, Km is closed, K0 is disconnected, L2 and L1 are reversely connected to the circuit;

[0027] The boost principle is as follows:

[0028] When in the third gear, the linkage piece 11 of the polarity switch Kj is connected to the connection pins 1 and 2 at the same time, and the linkage piece 12 is connected to the connection pins 3 and 4 at the same time; at this time, the on-off switch Ke of the rated voltage branch is closed, the on-off switches of the voltage regulating branch are all disconnected, and the transition on-off switch K0 in the transition switching unit is also disconnected.

[0029] When shifting to the fourth gear, the first step is to close the on-off switch K1 in the voltage regulating branch, and the disconnect switch K0 of the transition switching unit is in the off state. At this time, the rated voltage branch supplies power, and the transition resistor provides short-circuit protection; then, the on-off switch Ke on the rated voltage branch is disconnected, and the voltage regulating coil L1 is connected to the circuit. The third step is to close the on-off switch K0 in the transition switching unit to complete the shift from the third gear to the fourth gear.

[0030] When shifting from the fourth gear to the fifth gear, the first step is to disconnect the on-off switch K0 in the transition switching unit, and then close the on-off switch Km in the voltage regulating branch. At this time, K1 and Km are both closed, and the voltage regulating coil L1 is connected to the circuit. The third step is to disconnect the on-off switch K1 in the voltage regulating branch, and the voltage regulating coils L1 and L2 are connected to the circuit, completing the switching from the fourth gear to the fifth gear.

[0031] The principle of blood pressure reduction is as follows:

[0032] When in the third gear, switch the polarity switch Kj so that the linkage piece 11 is connected to the connection pins 2 and 3 at the same time, and the linkage piece is connected to the connection pins 4 and 5 at the same time; at this time, the on-off switch Ke of the rated voltage branch is closed, the on-off switches of the voltage regulating branch are all disconnected, and the transition on-off switch K0 in the transition switching unit is also disconnected, and the rated voltage branch is used for power supply.

[0033] When downgrading to second gear, the first step is to close the on-off switch K1 in the voltage regulating branch, and the disconnect switch K0 of the transition switching unit is in the open state. At this time, the on-off switches K1 and Ke are both closed, the transition resistor provides short-circuit protection, and the rated voltage branch is used for power supply; then, the on-off switch Ke on the rated voltage branch is disconnected, and the voltage regulating coil L2 is reversely connected to the circuit. The third step is to close the on-off switch K0 in the transition switching unit to complete the downgrading from third gear to second gear.

[0034] When downgrading from second gear to one gear, the first step is to disconnect the on-off switch K0 in the transition switching unit, and then close the on-off switch Km in the voltage regulating branch. At this time, Km and K1 are both closed, and the voltage regulating coil L2 is reversed to the circuit. The third step is to disconnect the on-off switch K1 in the voltage regulating branch, and the voltage regulating coils L2 and L1 are reversed to the circuit to complete the switching from second gear to one gear.

[0035] Throughout the five-speed voltage regulation process, the rated voltage branch, or the voltage regulation branch of the previous level, supplies power to the voltage regulation branch of the next level. Power remains constant throughout the entire voltage regulation process. The five-speed voltage regulation circuit, through the dual-link structure of the polarity switch, reduces the number of voltage regulation branches from three in the existing technology to two. This reduces the number of coil connectors, simplifies the structure, and streamlines the overall design. It also significantly reduces overall space, costs, and process complexity, making it easier to manufacture and design. The reduced number of circuits also helps improve safety.

Claims

1. A five-pin polarity reversing switch for a transformer voltage regulator, characterized in that: The invention comprises five connecting legs, two linkage plates, a connecting leg mounting base and a linkage plate driving device; the five connecting legs are spaced apart along a straight line on the connecting leg mounting base, namely the first, second, third, fourth and fifth connecting legs; two linkage plates are mounted on the linkage plate driving device, adjacently distributed left and right along the straight line where the five connecting legs are located, namely the left linkage plate and the right linkage plate, and the spacing between the linkage plates is twice the spacing between the connecting legs; the linkage plate driving device comprises a limiting slot, a push rod, a U-shaped bracket and an electromagnetic driver; the linkage plate is mounted on the push rod via a limiting slot with a built-in spring; the push rod is limited by a pair of U-shaped brackets mounted on the base plate and slides axially, and one end of the push rod is connected to the electromagnetic driver; The first connecting pin is connected to the output tap of the lower side of the voltage regulating winding in the transformer voltage regulating circuit, the second connecting pin is connected to a voltage regulating branch in the transformer voltage regulating circuit, and the other voltage regulating branches in the transformer voltage regulating circuit are connected to the corresponding output taps of the voltage regulating winding branches in the transformer voltage regulating circuit. The third connecting pin is connected to the upper input tap of the voltage regulating winding in the transformer voltage regulating circuit, the fourth connecting pin is connected to the output tap of the main winding in the transformer voltage regulating circuit, and the fifth connecting pin is connected to the output tap of the lower side of the voltage regulating winding in the transformer voltage regulating circuit; the polarity conversion switch forms two connection relationships with the synchronous sliding of the two linkage pieces. The first connection relationship is that the left linkage piece is connected to the first and second connection pins at the same time, and the right linkage piece is connected to the third and fourth connection pins at the same time; the second connection relationship is that the left linkage piece is connected to the second and third connection pins at the same time, and the right linkage piece is connected to the fourth and fifth connection pins at the same time.

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