CN213242303U

CN213242303U - On-load tap-changer for tapping by power semiconductor device

Info

Publication number: CN213242303U
Application number: CN202022096355.9U
Authority: CN
Inventors: 肖毅; 袁耀; 张曦; 杨家辉; 李锐海; 王帅兵
Original assignee: Shanghai Huaming Power Equipment Co Ltd; Research Institute of Southern Power Grid Co Ltd
Current assignee: Shanghai Huaming Power Equipment Co Ltd; CSG Electric Power Research Institute; Research Institute of Southern Power Grid Co Ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-05-18
Anticipated expiration: 2030-09-23

Abstract

The utility model discloses an on-load tap-changer with power semiconductor device carries out tapping, including switch S1, switch S2, silicon controlled T1, silicon controlled T2 and resistance R1, switch S1 ' S contact 1 linked switch S2 ' S contact 1 and mechanical main contact A, switch S1 ' S contact 2 linked switch S2 ' S contact 2 and mechanical main contact B, mechanical main contact A ' S other end connecting resistance R, silicon controlled T2 ' S a main electrode and mechanical main contact B ' S the other end, the beneficial effects of the utility model are that: 1. the high-power semiconductor thyristor has small volume, large capacity and low price. 2. And in a steady state, the high-power semiconductor thyristor has no loss. 3. The circuit has no active devices, all passive devices and no electronic devices for detecting state and controlling, and is simple and reliable. 4. The mechanical switch provides a trigger signal, and the reliability is greatly improved.

Description

On-load tap-changer for tapping by power semiconductor device

Technical Field

The utility model relates to the field of switch technology, specifically an on-load tap-changer with power semiconductor device carries out the shunting.

Background

An on-load tap changer refers to a voltage regulating device suitable for operation under transformer excitation or load for changing the tapping connection position of a transformer winding. The basic principle is to realize the switching between taps in the transformer winding under the condition of ensuring that the load current is not interrupted, thereby changing the number of turns of the winding, namely the voltage ratio of the transformer, and finally realizing the purpose of voltage regulation.

Most of the existing on-load tap-changers have complex structures and poor stability.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an on-load tap-changer with power semiconductor device carries out the shunting to solve the problem that provides among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

an on-load tap-changer for tapping by a power semiconductor device comprises a switch S1, a switch S2, a thyristor T1, a thyristor T2 and a resistor R1, wherein a contact 1 of the switch S1 is connected with a contact 1 of a switch S2 and a mechanical main contact A, a contact 2 of the switch S1 is connected with a contact 2 of a switch S2 and a mechanical main contact B, the other end of the mechanical main contact A is connected with a resistor R, one main electrode of the thyristor T2 and the other end of the mechanical main contact B, a contact 3 of a switch S1 is connected with one main electrode of a switch G1 and one main electrode of the thyristor T1, the other main electrode of the thyristor T1 is connected with the other end of the resistor R, a control electrode of the thyristor T1 is connected with the other end of the switch G1, a contact 3 of the switch S2 is connected with one main electrode of the switch G2 and the thyristor T2, and a.

As a further technical solution of the present invention: and the resistor R is a transition follow current resistor.

As a further technical solution of the present invention: the thyristor T1 is a bidirectional thyristor.

As a further technical solution of the present invention: the thyristor T2 is a bidirectional thyristor.

As a further technical solution of the present invention: the switch S1 and the switch S2 are both single-pole double-throw switches.

Compared with the prior art, the beneficial effects of the utility model are that: 1. the high-power semiconductor thyristor has small volume, large capacity and low price. 2. And in a steady state, the high-power semiconductor thyristor has no loss. 3. The circuit has no active devices, all passive devices and no electronic devices for detecting state and controlling, and is simple and reliable. 4. The mechanical switch provides a trigger signal, and the reliability is greatly improved.

Drawings

Fig. 1 is a circuit diagram of the present invention.

FIG. 2 is a timing chart of voltage regulation operation.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: referring to fig. 1 and 2, an on-load tap changer for tapping by a power semiconductor device includes a switch S1, a switch S2, a thyristor T1, a thyristor T2, and a resistor R1, where a contact 1 of the switch S1 is connected to a contact 1 of a switch S2 and a mechanical main contact a, a contact 2 of the switch S1 is connected to a contact 2 of a switch S2 and a mechanical main contact B, the other end of the mechanical main contact a is connected to a resistor R, one main electrode of the thyristor T2, and the other end of the mechanical main contact B, a contact 3 of the switch S1 is connected to a main electrode of a switch G1 and one main electrode of the thyristor T1, the other main electrode of the thyristor T1 is connected to the other end of the resistor R, a control electrode of the thyristor T1 is connected to the other end of the switch G1, a contact 3 of the switch S2 is connected to one main electrode of the switch G2 and one main electrode of the thyristor.

The pressure regulating action time sequence of the design is divided into the following 10 time sequences:

1, the main contact a is open. (timing T1)

2, the thyristor of T2 detects that the voltage difference is triggered to conduct the follow current (time sequence T2), and the impedance of T1 is higher than the cut-off state of T2.

3, T2-G2 control the switch to open, T2 is turned off (timing T3).

4, the thyristor of T1 detects the voltage difference to trigger the conduction and the follow current (time sequence T3-T5).

5, T2-S2 breaks A. (timing T4)

6, T2-S2 accesses B. (timing T5)

7, T2-G2 controls the switch to switch on to B, T2 is conducted at the B end and the T1-A contact is bridged at the A end to simultaneously freewheel. (timing T6)

8, T1-G1 is off and T1 is off. (timing T7)

9, T1-S1 breaks A. (timing T8)

10, B main contact cut-in follow current (time sequence T9)

11, T1-S1/T1G1 is switched in B to complete the voltage regulation switching. (timing T10)

Fig. 2 is a timing chart of high and low levels of the respective switches, in which the contact is connected to the electrode terminal H (up) and disconnected to the electrode terminal L (down).

Example 2: on the basis of example 1: the resistor R is a transition follow current resistor. Thyristor T1 is a triac. Thyristor T2 is a triac. Switch S1 and switch S2 are both single pole, double throw switches.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An on-load tap-changer for tapping by a power semiconductor device comprises a switch S1, a switch S2, a thyristor T1, a thyristor T2 and a resistor R1, and is characterized in that a contact 1 of the switch S1 is connected with a contact 1 of a switch S2 and a mechanical main contact A, a contact 2 of the switch S1 is connected with a contact 2 of a switch S2 and a mechanical main contact B, the other end of the mechanical main contact A is connected with a resistor R, one main electrode of the thyristor T2 and the other end of the mechanical main contact B, a contact 3 of a switch S1 is connected with one main electrode of a switch G1 and a thyristor T1, the other main electrode of the thyristor T1 is connected with the other end of the resistor R, a control electrode of the thyristor T1 is connected with the other end of the switch G1, a contact 3 of the switch S2 is connected with one main electrode of the switch G2 and the thyristor T2, and a control electrode of the.

2. An on-load tap changer for tapping power semiconductor devices according to claim 1, characterized in that said resistor R is a transition freewheel resistor.

3. An on-load tap changer for tapping power semiconductor devices according to claim 1, characterized in that said thyristor T1 is a triac.

4. An on-load tap changer for tapping power semiconductor devices according to claim 1, characterized in that said thyristor T2 is a triac.

5. An on-load tap changer for tapping power semiconductor devices according to any of claims 1-4, characterized in that said switch S1 is a single-pole double-throw switch.

6. The on-load tap changer of claim 5, wherein the switch S2 is a single-pole double-throw switch.