CN112349525A - Switch - Google Patents
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- CN112349525A CN112349525A CN202011312891.6A CN202011312891A CN112349525A CN 112349525 A CN112349525 A CN 112349525A CN 202011312891 A CN202011312891 A CN 202011312891A CN 112349525 A CN112349525 A CN 112349525A
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- control switch
- switch
- circuit
- limiting resistor
- impedance
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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
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a switch. The switch includes: the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; a drive mechanism including a drive coil for driving the operation of the switch assembly; and a control circuit. The control circuit in the switch controls the current flowing through the driving coil of the driving mechanism and the change rate thereof according to different operation working conditions of the circuit, so that the switch component executes the opening action and the closing action (opening and closing action) of the circuit at the most appropriate speed, namely, the combination of the rapid opening and closing action and the normal-speed opening and closing action is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
Description
Technical Field
The invention relates to the field of electric power, in particular to a switch.
Background
With the rapid development of industrialization and urbanization in China, the power demand will continuously increase in a long period. The power grid development task is heavy, and the development of the intelligent power distribution network is more urgent. A new generation of high-reliability intelligent high-speed circuit breakers (or switches) is researched and developed, and powerful technical guarantee can be provided for the safety and reliability of power supply of the intelligent power distribution network.
Conventionally, in order to secure grid safety, a fault circuit is cut off, and a circuit breaker is generally used to break the fault circuit. However, the switching-off speed is slow, and the fault circuit is cut off within 30ms to 40ms after the arc fault occurs, so that the switching equipment and the personal safety cannot be protected in time.
In recent years, high-speed circuit breakers have also been driven using an electromagnetic repulsion mechanism. The electromagnetic repulsion mechanism has simple structure, quick action and convenient realization of electronic control, and can well meet the requirement of opening speed. However, the electromagnetic repulsion mechanism has high opening and closing movement speed and large impact force, and reduces the service life and the safety of the high-speed circuit breaker.
Disclosure of Invention
The invention aims to provide a switch, which can solve the problems of the service life and the safety reduction of a high-speed switch in the related technology.
According to an aspect of the present invention, there is provided a switch comprising: the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; the driving mechanism comprises a driving coil and is used for driving the switch component to act; and a control circuit comprising: an energy storage element; the quick control switch and the constant speed control switch are connected in series and used for controlling the energy storage element to discharge the driving coil when the circuit fails so as to control the current flowing through the driving coil and the change rate of the current; the current limiting resistor is connected with the constant-speed control switch in parallel and used for controlling the energy storage element to discharge the driving coil when the circuit works normally so as to control the current flowing through the driving coil and the change rate of the current; wherein the current and its rate of change when the circuit fails is greater than the current and its rate of change when the circuit is operating normally.
Preferably, the fast control switch is a first control switch K1, the constant speed control switch is a second control switch K2, the first control switch K1, the second control switch K2, the driving coil L are connected in series with the energy storage element C, and the current limiting resistor R is connected in parallel with the second control switch K2; wherein the impedance of the current limiting resistor R is greater than 0.3 times the impedance of the driving coil L.
Preferably, the fast control switch is a first control switch K1, the constant speed control switch is a second control switch K2, the first control switch K1, the second control switch K2, and the driving coil L are connected in series with the energy storage element C, and the current limiting resistor R1 is connected in parallel with the second control switch K2, wherein the impedance of the current limiting resistor R1 is greater than 0.3 times the impedance of the driving coil L; the control circuit further comprises a current limiting resistor R2, a first end of which is connected between the first control switch K1 and the second control switch K2 which are connected in series, and a second end of which is connected between the driving coil L and the energy storage element C which are connected in series, wherein the impedance of the current limiting resistor R2 is greater than 0.3 times the impedance of the driving coil L.
Preferably, the fast control switch is a first control switch K1, the constant speed control switch is a second control switch K2, the first control switch K1, the second control switch K2, and the driving coil L are connected in series with the energy storage element C, and the current limiting resistor R1 is connected in parallel with the second control switch K2, wherein the impedance of the current limiting resistor R1 is greater than 0.3 times the impedance of the driving coil L; the control circuit further comprises a current limiting resistor R2, a first end of which is connected between the first control switch K1 and the second control switch K2 which are connected in series, and a second end of which is connected to the driving coil L, wherein the impedance of the current limiting resistor R2 is greater than 0.3 times the impedance of the driving coil L.
Preferably, the drive mechanism comprises at least one of: repulsion mechanism, electromagnetic mechanism, elastic mechanism.
Preferably, the manner of maintaining the opening/closing state of the driving mechanism includes at least one of: magnetic holding, elastic element holding, and mechanical latching holding.
Preferably, the control circuit comprises at least one of: silicon controlled rectifier, IGBT, relay, electromagnetic switch.
Preferably, the fast energy storage element and the constant speed energy storage element each comprise at least one of: a capacitor and a battery.
In the embodiment of the invention, the control circuit in the switch controls the current flowing through the driving coil of the driving mechanism and the change rate thereof according to different operation conditions of the circuit, so that the switch component executes the opening action and the closing action (opening and closing action) of the circuit at the most appropriate speed, namely, the combination of the rapid opening and closing action and the normal-speed opening and closing action is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a switch according to an embodiment of the present invention;
FIG. 2 is a first schematic diagram of a control circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a control circuit according to an embodiment of the present invention; and
fig. 4 is a third schematic diagram of a control circuit according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a switch. Fig. 1 is a schematic diagram of a switch according to an embodiment of the present invention, as shown in fig. 1, including: the switching component 1 is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; a drive mechanism 2 including a drive coil for driving the operation of the switch assembly; and a control circuit 3 including: an energy storage element; the quick control switch and the constant speed control switch are connected in series and used for controlling the energy storage element to discharge the driving coil when the circuit fails so as to control the current flowing through the driving coil and the change rate of the current; the current limiting resistor is connected with the constant-speed control switch in parallel and used for controlling the energy storage element to discharge the driving coil when the circuit works normally so as to control the current flowing through the driving coil and the change rate of the current; wherein the current and its rate of change when the circuit fails are greater than the current and its rate of change when the circuit is operating normally.
In the related art, the electromagnetic repulsion mechanism of the high-speed switch has high opening and closing movement strength, so that fatigue damage is caused during long-time use, and the service life and safety of the high-speed switch are reduced. In the embodiment of the invention, the control circuit 3 controls the current flowing through the driving coil of the driving mechanism 2 and the change rate thereof according to different operating conditions of the circuit, so that the switching component 1 executes the switching-off action and the switching-on action (switching-off and switching-on actions) of the circuit at the most appropriate speed, namely, the combination of the rapid switching-on and switching-off action and the normal-speed switching-on and switching-off action is realized. Because the number of rapid opening and closing actions is reduced, the probability of fatigue damage is reduced, and the service life and the safety of the switch are ensured.
In the present embodiment, the switch assembly 1 comprises a vacuum interrupter (shown shaded), a stationary contact 11 and a movable contact 12. The moving contact 12 is connected with the driving mechanism 2 and is used for being disconnected or contacted with the static contact 11 under the driving of the driving mechanism 2, so that the opening and closing actions of the circuit are realized.
In the present embodiment, the driving mechanism 2 may be one or more of a repulsive force mechanism, an electromagnetic mechanism, and an elastic mechanism.
In this embodiment, the manner of holding the switching-on/off state may be one or more of magnetic holding, elastic element holding, and mechanism latch holding.
In the present embodiment, the control switch 3 may be one or more of a thyristor, an IGBT, a relay, and an electromagnetic switch.
In this embodiment, the fast energy storage element and the constant-speed energy storage element may be one or more of a capacitor and a battery.
The following describes in detail the implementation of the above-described embodiment of the present invention with reference to the drawings. In order to clearly distinguish the rapid opening and closing operation from the normal-speed opening and closing operation, reference numerals are defined as follows.
(1) The energy storage element for the fast/constant speed opening and closing action is marked C.
(2) The drive coil for the fast/constant speed opening and closing action is labeled L.
(3) The fast control switch for the fast opening and closing action is labeled K1.
(4) The constant speed control switch for the constant speed opening and closing operation is denoted by K2.
(5) The current limiting resistors for the fast/normal speed opening and closing action are labeled R, R1, R2.
Example 1
This example 1 involves discharging an energy storage element to a drive coil. Specifically, two control switches for rapid opening and closing actions are connected in series with the energy storage element to discharge a driving coil of the driving mechanism; and one of the two control switches is connected in parallel with the current limiting resistor.
Fig. 2 is a first schematic diagram of a control circuit according to an embodiment of the invention. As shown in fig. 2, the fast control switch is a first control switch K1, the constant speed control switch is a second control switch K2, the first control switch K1, the second control switch K2, the driving coil L are connected in series with the energy storage element C, and the current limiting resistor R is connected in parallel with the second control switch K2.
In example 1, when a circuit is in failure and a rapid opening and closing action is required, the first control switch K1 and the second control switch K2 are closed, the energy storage element C discharges the driving coil L of the driving mechanism 2, and as much current as possible is input or a current change rate as much as possible is provided, so that the switching assembly 1 is driven to perform the rapid opening and closing action of the circuit. When the circuit normally works and can adopt a normal-speed opening and closing action, only the first control switch K1 is closed, the energy storage element C discharges to the driving coil L of the driving mechanism 2, a small current is input to the driving coil or a small current change rate is provided through the current limiting action of the resistor, and the current is smaller than the current required by the rapid opening and closing action and the change rate thereof, so that the switch assembly 1 is driven to execute the normal-speed opening and closing action of the circuit.
In this example 1, the impedance of the resistor R and the impedance of the driving coil L preferably satisfy the following numerical relationship: the impedance of the current limiting resistor R is 0.3 times larger than that of the driving coil L so as to improve the rapid opening speed.
Example 2
Example 2 differs from example 1 in that a current limiting resistor R2 is added.
FIG. 3 is a second schematic diagram of a control circuit according to an embodiment of the invention. As shown in fig. 3, the fast control switch is a first control switch K1, the constant speed control switch is a second control switch K2, the first control switch K1, the second control switch K2, the driving coil L are connected in series with the energy storage element C, and the current limiting resistor R1 is connected in parallel with the second control switch K2; the control circuit also comprises a current limiting resistor R2, wherein a first end of the current limiting resistor R2 is connected between the first control switch K1 and the second control switch K2 which are connected in series, and a second end of the current limiting resistor R2 is connected between the driving coil L and the energy storage element C which are connected in series.
In example 2, when the circuit is in failure and a fast opening and closing action is required, the first control switch K1 and the second control switch K2 are closed, the energy storage element C discharges the driving coil L of the driving mechanism 2, and as much current as possible is input or as much current change rate as possible is provided, so that the switching assembly 1 is driven to perform the fast opening and closing action of the circuit. When the circuit normally works and can adopt a normal-speed opening and closing action, only the first control switch K1 is closed, the energy storage element C discharges to the driving coil L of the driving mechanism 2, a small current is input to the driving coil or a small current change rate is provided through the current limiting action of the resistor, and the current is smaller than the current required by the rapid opening and closing action and the change rate thereof, so that the switch assembly 1 is driven to execute the normal-speed opening and closing action of the circuit.
In this example 2, the impedance of the resistor R1 and the impedance of the driving coil L preferably satisfy the following numerical relationship: the impedance of the current limiting resistor R1 is 0.3 times larger than that of the driving coil L so as to improve the rapid opening speed. And the impedance of the current limiting resistor R1 is greater than the impedance of the current limiting resistor R2.
Example 3
Example 3 differs from example 2 in that a current limiting resistor R2 is connected to the drive coil L.
Fig. 4 is a third schematic diagram of a control circuit according to an embodiment of the invention. As shown in fig. 4, the fast control switch is a first control switch K1, the constant speed control switch is a second control switch K2, the first control switch K1, the second control switch K2, the driving coil L are connected in series with the energy storage element C, and the current limiting resistor R1 is connected in parallel with the second control switch K2; the control circuit also comprises a current limiting resistor R2, a first end of which is connected between the first control switch K1 and the second control switch K2 which are connected in series, and a second end of which is connected to the driving coil L.
In example 3, when the circuit is in failure and a rapid opening and closing action is required, the first control switch K1 and the second control switch K2 are closed, the energy storage element C discharges the driving coil L of the driving mechanism 2, and as much current as possible is input or as much current change rate as possible is provided, so that the switching assembly 1 is driven to perform the rapid opening and closing action of the circuit. When the circuit normally works and can adopt a normal-speed opening and closing action, only the first control switch K1 is closed, the energy storage element C discharges to the driving coil L of the driving mechanism 2, a small current is input to the driving coil or a small current change rate is provided through the current limiting action of the resistor, and the current is smaller than the current required by the rapid opening and closing action and the change rate thereof, so that the switch assembly 1 is driven to execute the normal-speed opening and closing action of the circuit.
In this example 3, the impedance of the resistor R1 and the impedance of the driving coil L preferably satisfy the following numerical relationship: the impedance of the current limiting resistor R1 is 0.3 times larger than that of the driving coil L so as to improve the rapid opening speed. And the impedance of the current limiting resistor R1 is greater than the impedance of the current limiting resistor R2.
In summary, according to the above embodiments of the present invention, a switch is provided. The switch includes: the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down; a drive mechanism including a drive coil for driving the operation of the switch assembly; and a control circuit comprising: an energy storage element; the quick control switch and the constant speed control switch are connected in series and used for controlling the energy storage element to discharge the driving coil when the circuit fails so as to control the current flowing through the driving coil and the change rate of the current; the current limiting resistor is connected with the constant-speed control switch in parallel and used for controlling the energy storage element to discharge the driving coil when the circuit works normally so as to control the current flowing through the driving coil and the change rate of the current; wherein the current and its rate of change when the circuit fails are greater than the current and its rate of change when the circuit is operating normally.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A switch, comprising:
the switching component is used for executing the opening action and the closing action of the circuit when the circuit works normally or breaks down;
the driving mechanism comprises a driving coil and is used for driving the switch component to act; and
a control circuit, comprising:
an energy storage element;
the quick control switch and the constant speed control switch are connected in series and used for controlling the energy storage element to discharge the driving coil when the circuit fails so as to control the current flowing through the driving coil and the change rate of the current;
the current limiting resistor is connected with the constant-speed control switch in parallel and used for controlling the energy storage element to discharge the driving coil when the circuit works normally so as to control the current flowing through the driving coil and the change rate of the current;
wherein the current and its rate of change when the circuit fails is greater than the current and its rate of change when the circuit is operating normally.
2. The switch of claim 1,
the fast control switch is a first control switch (K1), the constant speed control switch is a second control switch (K2), the first control switch (K1), the second control switch (K2), the driving coil (L) and the energy storage element (C) are connected in series, and the current limiting resistor (R) and the second control switch (K2) are connected in parallel;
wherein the impedance of the current limiting resistor (R) is greater than 0.3 times the impedance of the drive coil (L).
3. The switch of claim 1,
the fast control switch is a first control switch (K1), the constant speed control switch is a second control switch (K2), the first control switch (K1), the second control switch (K2), the driving coil (L) and the energy storage element (C) are connected in series, the current limiting resistor (R1) and the second control switch (K2) are connected in parallel, and the impedance of the current limiting resistor (R1) is greater than 0.3 times of the impedance of the driving coil (L);
the control circuit further comprises a current limiting resistor (R2) having a first end connected between the first control switch (K1) and the second control switch (K2) in series and a second end connected between the drive coil (L) and the energy storage element (C) in series, wherein the impedance of the current limiting resistor (R2) is greater than 0.3 times the impedance of the drive coil (L).
4. The switch of claim 1,
the fast control switch is a first control switch (K1), the constant speed control switch is a second control switch (K2), the first control switch (K1), the second control switch (K2), the driving coil (L) and the energy storage element (C) are connected in series, the current limiting resistor (R1) and the second control switch (K2) are connected in parallel, and the impedance of the current limiting resistor (R1) is greater than 0.3 times of the impedance of the driving coil (L);
the control circuit further comprises a current limiting resistor (R2) having a first end connected between the first control switch (K1) and the second control switch (K2) in series and a second end connected to the drive coil (L), wherein the impedance of the current limiting resistor (R2) is greater than 0.3 times the impedance of the drive coil (L).
5. The switch of any one of claims 1 to 4, wherein the drive mechanism comprises at least one of: repulsion mechanism, electromagnetic mechanism, elastic mechanism.
6. The switch according to any one of claims 1 to 4, wherein the manner of maintaining the on/off state of the drive mechanism comprises at least one of: magnetic holding, elastic element holding, and mechanical latching holding.
7. The switch of any one of claims 1 to 4, wherein the control circuit comprises at least one of: silicon controlled rectifier, insulated gate bipolar transistor IGBT, relay, electromagnetic switch.
8. The switch of any of claims 1 to 4, wherein the fast energy storage element and the constant speed energy storage element each comprise at least one of: a capacitor and a battery.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020106644385 | 2020-07-10 | ||
| CN202010664438 | 2020-07-10 | ||
| CN2020214442041 | 2020-07-21 | ||
| CN202021444204 | 2020-07-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112349525A true CN112349525A (en) | 2021-02-09 |
| CN112349525B CN112349525B (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011308551.6A Active CN112490066B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312891.6A Active CN112349525B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011308458.5A Active CN112490064B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312898.8A Active CN112490067B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312893.5A Active CN112490037B (en) | 2020-07-10 | 2020-11-20 | Switch and control method thereof |
| CN202011308533.8A Active CN112490065B (en) | 2020-07-10 | 2020-11-20 | Switch |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011308551.6A Active CN112490066B (en) | 2020-07-10 | 2020-11-20 | Switch |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011308458.5A Active CN112490064B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312898.8A Active CN112490067B (en) | 2020-07-10 | 2020-11-20 | Switch |
| CN202011312893.5A Active CN112490037B (en) | 2020-07-10 | 2020-11-20 | Switch and control method thereof |
| CN202011308533.8A Active CN112490065B (en) | 2020-07-10 | 2020-11-20 | Switch |
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| CN (6) | CN112490066B (en) |
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| CN116092845B (en) * | 2023-04-03 | 2023-06-16 | 宁波天安智能电网科技股份有限公司 | Series digital double-break high-voltage switch device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112490064B (en) | 2023-09-05 |
| CN112490067B (en) | 2022-11-29 |
| CN112490066A (en) | 2021-03-12 |
| CN112490066B (en) | 2023-03-10 |
| CN112490065B (en) | 2023-05-30 |
| CN112490064A (en) | 2021-03-12 |
| CN112490065A (en) | 2021-03-12 |
| CN112490067A (en) | 2021-03-12 |
| CN112490037B (en) | 2023-02-28 |
| CN112349525B (en) | 2023-07-25 |
| CN112490037A (en) | 2021-03-12 |
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