CN114243662B - VFTO anti-interference circuit and switch device - Google Patents
VFTO anti-interference circuit and switch device Download PDFInfo
- Publication number
- CN114243662B CN114243662B CN202111285183.2A CN202111285183A CN114243662B CN 114243662 B CN114243662 B CN 114243662B CN 202111285183 A CN202111285183 A CN 202111285183A CN 114243662 B CN114243662 B CN 114243662B
- Authority
- CN
- China
- Prior art keywords
- inductor
- vfto
- capacitor
- protection circuit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 105
- 230000036039 immunity Effects 0.000 claims description 17
- 230000001052 transient effect Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The application relates to a VFTO anti-interference circuit and a switch device, wherein the VFTO anti-interference circuit comprises a lightning protection circuit and a VFTO protection circuit, the lightning protection circuit is connected with a power input end and the VFTO protection circuit, the VFTO protection circuit is connected with the switch circuit, the lightning protection circuit is used for discharging and limiting common and differential mode pulse voltages, and the VFTO protection circuit is used for inhibiting the differential mode pulse voltages. The lightning protection circuit is used for discharging and limiting the common mode pulse voltage and the differential mode pulse voltage, and the VFTO protection circuit is combined for inhibiting the differential mode pulse voltage, so that the fast transient overvoltage is inhibited, the circuit has the function of resisting the VFTO, and the VFTO protection is effectively carried out.
Description
Technical Field
The application relates to the technical field of power electronic equipment, in particular to a VFTO anti-interference circuit and a switch device.
Background
The fast transient overvoltage VFTO (ver-fast-TRANSIENT OVER VOLTAGE) is referred to in the standard as the very fast wavefront overvoltage VFFO (ver-fast-front over voltage). VFTO may be defined as a transient overvoltage with a wave front time in the range of 3 to 100 nanoseconds, primarily arising from the operation of the disconnector, which may also be referred to as a disconnector operation overvoltage. The main hazard of the VFTO is that overvoltage generated by the VFTO affects the insulation of primary equipment, and besides, the primary equipment and secondary equipment are very close to each other, so that the secondary equipment is subjected to various electromagnetic pollution to generate false alarm, and even the serious condition of direct failure is caused. How to effectively perform the VFTO protection is a problem to be solved.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a VFTO immunity circuit and switching device that can effectively perform VFTO protection.
The utility model provides a VFTO immunity circuit, includes lightning protection circuit and VFTO protection circuit, lightning protection circuit connect the power input with VFTO protection circuit, VFTO protection circuit connects switch circuit, lightning protection circuit is used for discharging and the amplitude limiting to common, differential mode pulse voltage, VFTO protection circuit is used for suppressing differential mode pulse voltage.
In one embodiment, the lightning protection circuit includes a discharge gap G1, an inductance L0, a variable resistor VR1, a variable resistor VR2, and a discharge gap G2;
The first side end of the inductor L0 is connected with the power input end, and the second side end of the inductor L0 is connected with the VFTO protection circuit; the first end and the second end of the discharge gap G1 are connected with the power input end, and the third end of the discharge gap G1 is grounded; the variable resistor VR1 and the variable resistor VR2 are connected in series and then connected with the second side end of the inductor L0, the first end of the discharge gap G2 is connected with the common end of the variable resistor VR1 and the variable resistor VR2, and the second end of the discharge gap G2 is grounded.
In one embodiment, the lightning protection circuit further includes a capacitor C1 and a capacitor C2, where the capacitor C1 and the capacitor C2 are connected in series, and a common end is connected to the second end of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to the second side end of the inductor L0.
In one embodiment, the capacitor C1 is a Y1 type capacitor.
In one embodiment, the capacitor C2 is a Y1 capacitor.
In one embodiment, the sum of the capacitances of the capacitance C1 and the capacitance C2 is less than or equal to 5000pF.
In one embodiment, the VFTO protection circuit includes an inductor L1 and an inductor L2, a first side end of the inductor L1 is connected to a second side end of the inductor L0, a second side end of the inductor L1 is connected to a first side end of the inductor L2, and a second side end of the inductor L2 is connected to the switching circuit.
In one embodiment, the VFTO protection circuit further includes a capacitor C3 connected in parallel to the first side of the inductor L1.
In one embodiment, the VFTO protection circuit further includes a capacitor C4 connected in parallel to the second side of the inductor L1.
The utility model provides a switchgear, includes switch circuit and VFTO immunity circuit, and VFTO immunity circuit includes lightning protection circuit and VFTO protection circuit, lightning protection circuit connect the power input with VFTO protection circuit, VFTO protection circuit connects switch circuit, lightning protection circuit is used for discharging and the amplitude limiting to common, differential mode pulse voltage, VFTO protection circuit is used for suppressing differential mode pulse voltage.
The VFTO anti-interference circuit comprises a lightning protection circuit and a VFTO protection circuit, wherein the lightning protection circuit is connected with the power input end and the VFTO protection circuit, the VFTO protection circuit is connected with the switch circuit and is used for discharging and limiting common and differential mode pulse voltages, and the VFTO protection circuit is used for inhibiting the differential mode pulse voltages. The lightning protection circuit is used for discharging and limiting the common mode pulse voltage and the differential mode pulse voltage, and the VFTO protection circuit is combined for inhibiting the differential mode pulse voltage, so that the fast transient overvoltage is inhibited, the circuit has the function of resisting the VFTO, and the VFTO protection is effectively carried out.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a block diagram of a VFTO immunity circuit in one embodiment;
Fig. 2 is a schematic structural diagram of a switchgear in an embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", and the like, if the connected circuits, modules, units, and the like have electrical or data transferred therebetween.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Meanwhile, the term used in the present specification includes any and all combinations of the items listed in association.
In one embodiment, as shown in fig. 1, there is provided a VFTO immunity circuit, which includes a lightning protection circuit 110 and a VFTO protection circuit 120, wherein the lightning protection circuit 110 is connected to a power input terminal and the VFTO protection circuit 120, the VFTO protection circuit 120 is connected to a switching circuit, the lightning protection circuit 110 is used for discharging and limiting common and differential mode pulse voltages, and the VFTO protection circuit 120 is used for suppressing differential mode pulse voltages.
As shown in fig. 2, the power input terminal includes a port a and a port B, the lightning protection circuit 110 is connected to the port a and the port B, and when the switch circuit 200 is turned on, an external power is connected to the switch circuit 200, and a current is supplied to the switch circuit 200 through the VFTO protection circuit 120. The back end of the switch circuit 200 may be connected to a load device, and the connected current is delivered to the back end load device for power supply. When the switching circuit 200 is turned off, it is disconnected from the external power supply, and the power supply to the load device is stopped. The common mode pulse voltage and the differential mode pulse voltage are easy to generate in the on-off switching process of the switch circuit 200, the lightning protection circuit 110 discharges the generated common mode pulse voltage and differential mode pulse voltage to limit the surge pulse voltage, and then carries out voltage limiting to further reduce the amplitude of the common mode pulse voltage and the differential mode pulse voltage. The VFTO protection circuit 120 further suppresses the differential mode pulse voltage, and eventually reduces both the common mode pulse voltage and the differential mode pulse voltage.
The specific structure of the lightning protection circuit 110 is not exclusive, and in one embodiment, with continued reference to fig. 2, the lightning protection circuit 110 includes a discharge gap G1, an inductance L0, a variable resistor VR1, a variable resistor VR2, and a discharge gap G2. The first side end of the inductor L0 is connected to the power input end, and the second side end of the inductor L0 is connected to the VFTO protection circuit 120; the first end and the second end of the discharge gap G1 are connected with the power input end, and the third end of the discharge gap G1 is grounded; the variable resistor VR1 and the variable resistor VR2 are connected in series and then connected with the second side end of the inductor L0, the first end of the discharge gap G2 is connected with the common end of the variable resistor VR1 and the variable resistor VR2, and the second end of the discharge gap G2 is grounded.
Specifically, the inductor L0 is used as a common-mode inductor, two homonymous ends of the inductor L0 are respectively connected with the port a and the port B, and two heteronymous ends of the inductor L0 are connected with the VFTO protection circuit 120. The first end and the second end of the discharge gap G1 are respectively connected with two homonymous ends of the inductor L0, and the third end of the discharge gap G1 is grounded through a port PE. After the variable resistor VR1 and the variable resistor VR2 are connected in series, the common end is connected with the first end of the discharge gap G2, the second end of the discharge gap G2 is grounded through the port PE, and the other end of the variable resistor VR1 and the other end of the variable resistor VR2 are respectively connected with two different-name ends of the inductor L0. When the common and differential mode pulse voltages are generated, the discharge gap G1 firstly discharges the common and differential mode pulse voltages, limits the surge pulse voltages, and then limits the amplitude of the common and differential mode pulse voltages through the inductor L0, the variable resistor VR1, the variable resistor VR2 and the discharge gap G2.
Further, in one embodiment, the lightning protection circuit 110 further includes a capacitor C1 and a capacitor C2, where the capacitor C1 and the capacitor C2 are connected in series and the common terminal is connected to the second end of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to the second side end of the inductor L0. After the capacitor C1 and the capacitor C2 are connected in series, the common terminal is connected to the second terminal of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to two opposite terminals of the inductor L0. The capacitors C1 and C2 can further suppress the common and differential mode pulse voltages. The specific types of the capacitor C1 and the capacitor C2 are not unique, and in this embodiment, the capacitor C1 is a Y1 type capacitor. Further, the capacitor C2 may be a Y1 type capacitor. The capacitor C1 and the capacitor C2 are used to suppress common mode interference. The specific capacitance values of the capacitor C1 and the capacitor C2 can also be selected according to actual needs, and in this embodiment, the sum of the capacitances of the capacitor C1 and the capacitor C2 is less than or equal to 5000pF.
The specific structure of the VFTO protection circuit 120 is also not unique, and in one embodiment, as shown in fig. 2, the VFTO protection circuit 120 includes an inductor L1 and an inductor L2, where a first side of the inductor L1 is connected to a second side of the inductor L0, a second side of the inductor L1 is connected to a first side of the inductor L2, and a second side of the inductor L2 is connected to the switch circuit 200. Specifically, the inductor L1 and the inductor L2 are used as common-mode inductors, two homonymous ends of the inductor L1 are correspondingly connected with two heteronymous ends of the inductor L0 in the lightning protection circuit 110, two homonymous ends of the inductor L2 are correspondingly connected with two heteronymous ends of the inductor L1, and two heteronymous ends of the inductor L2 are connected with the switching circuit 200. The differential pulse voltage is suppressed by the inductor L1 and the inductor L2, and both the common mode pulse voltage and the differential pulse voltage are reduced.
Further, in one embodiment, the VFTO protection circuit 120 further includes a capacitor C3 connected in parallel to the first side of the inductor L1. In addition, the VFTO protection circuit 120 further includes a capacitor C4 connected in parallel to the second side of the inductor L1. The specific types and capacitance values of the capacitor C3 and the capacitor C4 are not unique, and may be set according to actual needs. In addition, the inductor L0 can not only suppress the secondary lightning surge voltage, but also suppress the surge current generated by the circuit in combination with the capacitor C3, the inductor L1, the capacitor C4 and the inductor L2.
In the VFTO immunity circuit, the lightning protection circuit 110 is used for discharging and limiting the common mode pulse voltage and the differential mode pulse voltage, and the VFTO protection circuit 120 is combined for inhibiting the differential mode pulse voltage, so that the fast transient overvoltage is inhibited, the circuit has the function of resisting VFTO, and the VFTO protection is effectively carried out.
In one embodiment, a switching device is also provided, including the switching circuit 200 and the VFTO immunity circuit described above. Further, the switching device further comprises a capacitor C5 connected to the switching circuit 200. In addition, the switching device may further include a shielding case 300, and the switching circuit 200, the capacitor C5, and the VFTO immunity circuit are disposed in the shielding case 300.
The VFTO anti-interference circuit comprises a lightning protection circuit 110 and a VFTO protection circuit 120, wherein the lightning protection circuit 110 is connected with a power input end and the VFTO protection circuit 120, the VFTO protection circuit 120 is connected with a switch circuit, the lightning protection circuit 110 is used for discharging and limiting common and differential mode pulse voltages, and the VFTO protection circuit 120 is used for inhibiting the differential mode pulse voltages.
As shown in fig. 2, the power input terminal includes a port a and a port B, the lightning protection circuit 110 is connected to the port a and the port B, and when the switch circuit 200 is turned on, an external power is connected to the switch circuit 200, and a current is supplied to the switch circuit 200 through the VFTO protection circuit 120. The back end of the switch circuit 200 may be connected to a load device, and the connected current is delivered to the back end load device for power supply. When the switching circuit 200 is turned off, it is disconnected from the external power supply, and the power supply to the load device is stopped. The common mode pulse voltage and the differential mode pulse voltage are easy to generate in the on-off switching process of the switch circuit 200, the lightning protection circuit 110 discharges the generated common mode pulse voltage and differential mode pulse voltage to limit the surge pulse voltage, and then carries out voltage limiting to further reduce the amplitude of the common mode pulse voltage and the differential mode pulse voltage. The VFTO protection circuit 120 suppresses the differential mode pulse voltage, and eventually reduces both the common mode pulse voltage and the differential mode pulse voltage.
In one embodiment, the lightning protection circuit 110 includes a discharge gap G1, an inductance L0, a variable resistor VR1, a variable resistor VR2, and a discharge gap G2. The first side end of the inductor L0 is connected to the power input end, and the second side end of the inductor L0 is connected to the VFTO protection circuit 120; the first end and the second end of the discharge gap G1 are connected with the input end of an electric power supply, and the third end of the discharge gap G1 is grounded; the variable resistor VR1 and the variable resistor VR2 are connected in series and then connected with the second side end of the inductor L0, the first end of the discharge gap G2 is connected with the common end of the variable resistor VR1 and the variable resistor VR2, and the second end of the discharge gap G2 is grounded.
Specifically, the inductor L0 is used as a common-mode inductor, two homonymous ends of the inductor L0 are respectively connected with the port a and the port B, and two heteronymous ends of the inductor L0 are connected with the VFTO protection circuit 120. The first end and the second end of the discharge gap G1 are respectively connected with two homonymous ends of the inductor L0, and the third end of the discharge gap G1 is grounded through a port PE. After the variable resistor VR1 and the variable resistor VR2 are connected in series, the common end is connected with the first end of the discharge gap G2, the second end of the discharge gap G2 is grounded through the port PE, and the other end of the variable resistor VR1 and the other end of the variable resistor VR2 are respectively connected with two different-name ends of the inductor L0. When the common and differential mode pulse voltages are generated, the discharge gap G1 firstly discharges the common and differential mode pulse voltages, limits the surge pulse voltages, and then limits the amplitude of the common and differential mode pulse voltages through the inductor L0, the variable resistor VR1, the variable resistor VR2 and the discharge gap G2.
In one embodiment, the lightning protection circuit 110 further includes a capacitor C1 and a capacitor C2, where the capacitor C1 and the capacitor C2 are connected in series, and the common terminal is connected to the second end of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to the second side end of the inductor L0. After the capacitor C1 and the capacitor C2 are connected in series, the common terminal is connected to the second terminal of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to two opposite terminals of the inductor L0. The capacitors C1 and C2 can further suppress the common and differential mode pulse voltages. The specific types of the capacitor C1 and the capacitor C2 are not unique, and in this embodiment, the capacitor C1 is a Y1 type capacitor. Further, the capacitor C2 may be a Y1 type capacitor. The capacitor C1 and the capacitor C2 are used to suppress common mode interference. The specific capacitance values of the capacitor C1 and the capacitor C2 can also be selected according to actual needs, and in this embodiment, the sum of the capacitances of the capacitor C1 and the capacitor C2 is less than or equal to 5000pF.
In one embodiment, the VFTO protection circuit 120 includes an inductor L1 and an inductor L2, a first side of the inductor L1 is connected to a second side of the inductor L0, a second side of the inductor L1 is connected to a first side of the inductor L2, and a second side of the inductor L2 is connected to the switching circuit 200. Specifically, the inductor L1 and the inductor L2 are used as common-mode inductors, two homonymous ends of the inductor L1 are correspondingly connected with two heteronymous ends of the inductor L0 in the lightning protection circuit 110, two homonymous ends of the inductor L2 are correspondingly connected with two heteronymous ends of the inductor L1, and two heteronymous ends of the inductor L2 are connected with the switching circuit 200. The differential pulse voltage is suppressed by the inductor L1 and the inductor L2, and both the common mode pulse voltage and the differential pulse voltage are reduced.
In one embodiment, the VFTO protection circuit 120 further includes a capacitor C3 connected in parallel to the first side of the inductor L1. In addition, the VFTO protection circuit 120 further includes a capacitor C4 connected in parallel to the second side of the inductor L1. The specific types and capacitance values of the capacitor C3 and the capacitor C4 are not unique, and may be set according to actual needs. The inductor L0 not only can inhibit secondary lightning surge voltage, but also can inhibit surge current generated by a circuit by combining the capacitor C3, the inductor L1, the capacitor C4 and the inductor L2.
In the above switch device, the lightning protection circuit 110 is used to discharge and limit the common-mode pulse voltage and the differential-mode pulse voltage, and the VFTO protection circuit 120 is combined to inhibit the differential-mode pulse voltage, so as to inhibit the fast transient overvoltage, so that the circuit has the function of resisting VFTO and effectively performs VFTO protection.
In order to facilitate a better understanding of the VFTO immunity circuit and switching device described above, a detailed explanation is provided below in connection with specific embodiments.
As described in the background art, the fast transient overvoltage VFTO is called as a very fast wave front overvoltage in the standard, and a great amount of research work is performed on the cause, the characteristics, the hazard and the prevention of the VFTO in the power system in scientific research institutions and higher schools. The work of generating, controlling, measuring and transmitting VFTO was done in the laboratory, starting in 2003 when the IEC 60044-2-1997 standard required the transmission of overvoltage measurement test items by power transformers. Due to the inherent inductance and resistance existing inside the surge voltage generator, the wave front rising time is adjusted to be 0.5us, the difficulty is great, and the implementation of the wave is more difficult for the type B surge wave 10ns wave. In 2008, a GIS voltage transformer high-frequency circuit model based on a black box method is established, and secondary voltage waves are analyzed from theory.
The conventional overvoltage can be classified according to internal reasons (operation overvoltage, resonance overvoltage, etc.) and external reasons (mainly lightning overvoltage) of the power grid, and can be classified into temporary overvoltage, operation overvoltage, lightning overvoltage, etc. according to duration. In general, the internal overvoltage has long duration (millisecond level), the external overvoltage has short duration (microsecond level), and the VFTO has the characteristics of both, and is generated by the operation of switching the no-load short-wire line by the disconnecting switch in a live mode, and the frequency of the shock wave can reach hundreds of megahertz. In short, VFTO may be defined as a transient overvoltage with a wave front time in the range of 3-100 nanoseconds, primarily arising from the operation of the disconnector, which may also be referred to as a disconnector operation overvoltage.
The main hazard of the VFTO is that overvoltage generated by the VFTO affects the insulation of primary equipment, and besides, the primary equipment and secondary equipment are very close to each other, so that the secondary equipment is subjected to various electromagnetic pollution to generate false alarm, and even the serious condition of direct failure is caused. Unlike other overvoltages, the action of the contact is slow, and the VFTO waveform can be generated tens or hundreds of times in one isolating switch operation, so that if the protection of the chip protection device is not good, the influence is necessarily generated.
Based on this, as shown in fig. 2, the application provides a circuit for protecting a power supply circuit from surge and VFTO, which comprises a lightning protection circuit 110 and a VFTO protection circuit 120, wherein the lightning protection circuit 110 comprises a discharge gap G1, an inductance L0, a variable resistor VR1, a variable resistor VR2 and a discharge gap G2, a first side end of the inductance L0 is connected with a power supply input end, and a second side end of the inductance L0 is connected with the VFTO protection circuit 120; the first end and the second end of the discharge gap G1 are connected with the power input end, and the third end of the discharge gap G1 is grounded; the variable resistor VR1 and the variable resistor VR2 are connected in series and then connected with the second side end of the inductor L0, the first end of the discharge gap G2 is connected with the common end of the variable resistor VR1 and the variable resistor VR2, and the second end of the discharge gap G2 is grounded.
Specifically, the inductor L0 is used as a common-mode inductor, two homonymous ends of the inductor L0 are respectively connected with the port a and the port B, and two heteronymous ends of the inductor L0 are connected with the VFTO protection circuit 120. The first end and the second end of the discharge gap G1 are respectively connected with two homonymous ends of the inductor L0, and the third end of the discharge gap G1 is grounded through a port PE. After the variable resistor VR1 and the variable resistor VR2 are connected in series, the common end is connected with the first end of the discharge gap G2, the second end of the discharge gap G2 is grounded through the port PE, and the other end of the variable resistor VR1 and the other end of the variable resistor VR2 are respectively connected with two different-name ends of the inductor L0.
Further, the lightning protection circuit 110 further includes a capacitor C1 and a capacitor C2, where the capacitor C1 and the capacitor C2 are connected in series, and the common end is connected to the second end of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to the second side end of the inductor L0. After the capacitor C1 and the capacitor C2 are connected in series, the common terminal is connected to the second terminal of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to two opposite terminals of the inductor L0.
The VFTO protection circuit 120 includes an inductor L1 and an inductor L2, wherein a first side end of the inductor L1 is connected to a second side end of the inductor L0, a second side end of the inductor L1 is connected to a first side end of the inductor L2, and a second side end of the inductor L2 is connected to the switching circuit 200. Specifically, the inductor L1 and the inductor L2 are used as common-mode inductors, two homonymous ends of the inductor L1 are correspondingly connected with two heteronymous ends of the inductor L0 in the lightning protection circuit 110, two homonymous ends of the inductor L2 are correspondingly connected with two heteronymous ends of the inductor L1, and two heteronymous ends of the inductor L2 are connected with the switching circuit 200. The differential pulse voltage is suppressed by the inductor L1 and the inductor L2, and both the common mode pulse voltage and the differential pulse voltage are reduced. In addition, the VFTO protection circuit 120 further includes a capacitor C3 connected in parallel to the homonymous terminal of the inductor L1, and a capacitor C4 connected in parallel to the heteronymous terminal of the inductor L1. The specific types and capacitance values of the capacitor C3 and the capacitor C4 are not unique, and may be set according to actual needs.
Specifically, when the common-mode pulse voltage and the differential-mode pulse voltage are easily generated during the on-off switching of the switching circuit 200, the discharge gap G1 firstly discharges the common-mode pulse voltage and the differential-mode pulse voltage of more than 3000Vp to limit the surge pulse voltage to less than 3000Vp, and then limits the amplitude of the common-mode pulse voltage and the differential-mode pulse voltage to less than 1000Vp through the inductor L0, the variable resistor VR1, the variable resistor VR2 and the discharge gap G2. At the same time, the capacitors C1 and C2 can suppress the common and differential mode pulse voltages. The inductor L1, the capacitor C3 and the capacitor C4 also inhibit the differential mode pulse voltage, and finally the common mode pulse voltage can be reduced to below 600 volts, and the differential mode voltage is reduced to below 400 Vp. The inductor L0 not only can inhibit secondary lightning surge voltage, but also can inhibit surge current generated by the rectifying circuit by combining with the capacitor C3, the inductor L1, the capacitor C4 and the inductor L2. The capacitors C1 and C2 are Y1 type capacitors, and are used for inhibiting common mode interference, and the sum of the two capacitors cannot exceed 5000pF.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The VFTO anti-interference circuit is characterized by comprising a lightning protection circuit and a VFTO protection circuit, wherein the lightning protection circuit is connected with a power input end and the VFTO protection circuit, the VFTO protection circuit is connected with a switch circuit, the lightning protection circuit is used for discharging and limiting common and differential mode pulse voltages, and the VFTO protection circuit is used for inhibiting the differential mode pulse voltages;
The lightning protection circuit comprises a discharge gap G1, an inductance L0, a variable resistor VR1, a variable resistor VR2 and a discharge gap G2; the first side end of the inductor L0 is connected with the power input end, and the second side end of the inductor L0 is connected with the VFTO protection circuit; the first end and the second end of the discharge gap G1 are connected with the power input end, and the third end of the discharge gap G1 is grounded; the variable resistor VR1 and the variable resistor VR2 are connected in series and then connected with the second side end of the inductor L0, the first end of the discharge gap G2 is connected with the common end of the variable resistor VR1 and the variable resistor VR2, and the second end of the discharge gap G2 is grounded;
The VFTO protection circuit comprises an inductor L1, an inductor L2, a capacitor C3 connected in parallel with a first side end of the inductor L1 and a capacitor C4 connected in parallel with a second side end of the inductor L1; the first side end of the inductor L1 is connected with the second side end of the inductor L0, the second side end of the inductor L1 is connected with the first side end of the inductor L2, and the second side end of the inductor L2 is connected with the switch circuit;
The discharging gap G1 is used for discharging common and differential mode pulse voltages above 3000Vp, the inductor L0, the variable resistor VR1, the variable resistor VR2 and the discharging gap G2 are used for limiting amplitude, so that the amplitude of the common and differential mode pulse voltages is reduced to below 1000 Vp; the inductor L0 is used for suppressing secondary lightning surge voltage and is also used for suppressing surge current in combination with the capacitor C3, the inductor L1, the capacitor C4 and the inductor L2.
2. The VFTO immunity circuit of claim 1, further comprising a capacitor C1 and a capacitor C2, wherein the capacitor C1 and the capacitor C2 are connected in series and a common terminal is connected to the second end of the discharge gap G2, and the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected to the second side terminal of the inductor L0.
3. The VFTO immunity circuit of claim 2, wherein the capacitors C1 and C2 are used to suppress common and differential mode pulse voltages.
4. The VFTO immunity circuit of claim 2, wherein the capacitance C1 is a Y1 type capacitance.
5. The VFTO immunity circuit of claim 2, wherein the capacitance C2 is a Y1 type capacitance.
6. The VFTO immunity circuit of claim 2, wherein a sum of the capacitances of the capacitance C1 and the capacitance C2 is less than or equal to 5000pF.
7. The VFTO immunity circuit of claim 1, wherein the inductor L1 and the inductor L2 are common mode inductors, two homonymous terminals of the inductor L1 are correspondingly connected to two heteronymous terminals of the inductor L0, two homonymous terminals of the inductor L2 are correspondingly connected to two heteronymous terminals of the inductor L1, and two heteronymous terminals of the inductor L2 are connected to the switching circuit.
8. A switching device comprising a switching circuit and the VFTO immunity circuit of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111285183.2A CN114243662B (en) | 2021-11-01 | 2021-11-01 | VFTO anti-interference circuit and switch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111285183.2A CN114243662B (en) | 2021-11-01 | 2021-11-01 | VFTO anti-interference circuit and switch device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114243662A CN114243662A (en) | 2022-03-25 |
| CN114243662B true CN114243662B (en) | 2024-08-27 |
Family
ID=80743487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111285183.2A Active CN114243662B (en) | 2021-11-01 | 2021-11-01 | VFTO anti-interference circuit and switch device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114243662B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204046158U (en) * | 2014-08-14 | 2014-12-24 | 深圳市纳林科技有限公司 | A kind of lightning protection circuit of low-tension supply |
| CN106093494A (en) * | 2016-08-22 | 2016-11-09 | 四方继保（武汉）软件有限公司 | A kind of signal for electronic mutual inductor protects filter circuit |
Family Cites Families (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201956681U (en) * | 2010-12-30 | 2011-08-31 | 北京中北创新科技发展有限公司 | Power cord electromagnetic pulse protector |
| CN201985520U (en) * | 2011-02-01 | 2011-09-21 | 中兴通讯股份有限公司 | Alternating current line lightning protection device |
| CN102176807B (en) * | 2011-03-08 | 2013-10-02 | 河海大学常州校区 | Self-protective variable frequency modulation ICP (Inductively Coupled Plasma) ballast |
| CN202190073U (en) * | 2011-07-12 | 2012-04-11 | 深圳茂硕电源科技股份有限公司 | External 12kV lightning protection circuit |
| CN202872360U (en) * | 2012-10-15 | 2013-04-10 | 东莞市晶林灯饰有限公司 | LED power supply |
| CN203086135U (en) * | 2013-01-17 | 2013-07-24 | 深圳市赛盛技术有限公司 | Industrial switch direct current power supply port protection circuit |
| CN203261018U (en) * | 2013-03-28 | 2013-10-30 | 深圳市瑞隆源电子有限公司 | Lightning protection device for mega-byte network |
| CN103269210B (en) * | 2013-06-16 | 2015-09-02 | 国网吉林省电力有限公司电力科学研究院 | A kind of VFTO filter being applicable to GIS body type digital acquisition device |
| CN204089181U (en) * | 2014-01-31 | 2015-01-07 | 北京通力盛达节能设备股份有限公司 | A kind of lightning surge protection circuit and LED drive power |
| CN105375457A (en) * | 2014-08-25 | 2016-03-02 | 潍坊学院 | LED streetlight four-stage lightning protection module |
| CN104158163B (en) * | 2014-08-31 | 2017-01-18 | 华北电力大学（保定） | VFTO protection device and method for transformer in GIS substation |
| CN104242284A (en) * | 2014-09-04 | 2014-12-24 | 廖飞舟 | Equipotential lightning protection device |
| CN104319753A (en) * | 2014-09-19 | 2015-01-28 | 中山市鸿程科研技术服务有限公司 | Lightning protection circuit of low-voltage power supply |
| CN204333949U (en) * | 2015-01-07 | 2015-05-13 | 广州理标电子科技有限公司 | A kind of protection against lightning surge circuit for navigation mark equipment |
| CN204761146U (en) * | 2015-07-02 | 2015-11-11 | 深圳市金威源科技股份有限公司 | Bimodulus power supply |
| CN106803748A (en) * | 2016-10-19 | 2017-06-06 | 沈静 | A kind of wave filter suitable for protecting electromagnetic pulse interference |
| CN206164354U (en) * | 2016-10-19 | 2017-05-10 | 东莞市乐丰电器科技有限公司 | Power lightning protection circuit and power adapter |
| CN106505842B (en) * | 2016-10-19 | 2019-09-10 | 飞亚达（集团）股份有限公司 | Airborne DC power supply |
| CN207082836U (en) * | 2017-03-13 | 2018-03-09 | 成都秉德科技有限公司 | A kind of surge protective device suitable for outdoor communication line |
| CN207251200U (en) * | 2017-06-09 | 2018-04-17 | 广州冠图电子科技有限公司 | A kind of protection circuit of smart home power supply lightning surge |
| CN207542776U (en) * | 2017-11-21 | 2018-06-26 | 四川中光防雷科技股份有限公司 | A kind of surge protector for inhibiting electrical fast transient (eft) |
| KR20190080622A (en) * | 2017-12-28 | 2019-07-08 | 효성중공업 주식회사 | Very fast transient overvoltage suppressing device |
| CN109546634B (en) * | 2018-11-28 | 2020-07-14 | 北京精密机电控制设备研究所 | Composite broadband filter circuit with surge voltage resistance |
| CN110212534A (en) * | 2019-05-24 | 2019-09-06 | 江苏理工学院 | A kind of New-energy electric vehicle charge control system electromagnetic interference filter circuit |
| CN213185509U (en) * | 2020-08-12 | 2021-05-11 | 合利科技发展有限公司 | Strong electromagnetic pulse comprehensive protection device for alternating current power supply |
| CN112134267A (en) * | 2020-08-31 | 2020-12-25 | 广东瑞德智能科技股份有限公司 | Surge protection circuit, electromagnetic heating circuit and household appliance |
| CN112290521B (en) * | 2020-09-25 | 2023-06-13 | 深圳中科德能科技有限公司 | Surge protection circuit for redundant power supply interface of switch |
| CN213637073U (en) * | 2020-11-06 | 2021-07-06 | 上海旺湖电气有限公司 | Lightning surge protection circuit for navigation mark equipment |
| CN213585154U (en) * | 2020-11-20 | 2021-06-29 | 贝兹德智能科技有限公司 | Multistage lightning protection circuit |
| CN214412586U (en) * | 2021-04-16 | 2021-10-15 | 中科汇安科技成都有限公司 | High-power alternating current filtering device suitable for shelter car port |
-
2021
- 2021-11-01 CN CN202111285183.2A patent/CN114243662B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204046158U (en) * | 2014-08-14 | 2014-12-24 | 深圳市纳林科技有限公司 | A kind of lightning protection circuit of low-tension supply |
| CN106093494A (en) * | 2016-08-22 | 2016-11-09 | 四方继保（武汉）软件有限公司 | A kind of signal for electronic mutual inductor protects filter circuit |
Non-Patent Citations (1)
| Title |
|---|
| VFTO对电子式互感器及采集装置的影响及控制措施;邬小坤;电力大数据;20181231;第21卷(第12期);1-5 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114243662A (en) | 2022-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206389275U (en) | A kind of high-power electromagnetic pulse protection module for power line | |
| Florkowski et al. | Comparison of transformer winding responses to standard lightning impulses and operational overvoltages | |
| CN201663544U (en) | Filter module with electromagnetic interference resistance and transient suppression functions | |
| CN114243662B (en) | VFTO anti-interference circuit and switch device | |
| Lopez-Roldan et al. | Analysis, simulation and testing of transformer insulation failures related to switching transients overvoltages | |
| CN110112721B (en) | System and method for protecting overvoltage inside direct-current power distribution network system | |
| Christopoulos | Tutorial. Electromagnetic compatibility. Part 1: General principles | |
| CN204794664U (en) | Electromagnetic compatibility wave filter | |
| KR101171227B1 (en) | The protection device of high-speed communication lines for emp protection measures | |
| Heidary et al. | Transformer Resonance: Reasons, Modeling Approaches, Solutions | |
| KR101936103B1 (en) | Dual Class SURGE and EMP Protector | |
| CN114089023A (en) | Detection method and device for secondary cable disturbance voltage by VFTO and computer equipment | |
| Bajramovic et al. | Overvoltages in secondary circuits of air-insulated substation due to disconnector switching | |
| CN102486514B (en) | Direct current converter valve non-periodic trigger test apparatus based on capacitance-resistance apparatus | |
| Chi et al. | Comparison and analysis on Very Fast Transient Overvoltage based on 550kV GIS and 800kV GIS | |
| Pătru et al. | Applications of Voltage Pulse Generator to Achieve Current Pulses of High Amplitude | |
| Mota et al. | Generation of dc high voltage pulse for hipot testing using pfn based marx generator | |
| SHEN et al. | Research on EMC Tests for Economical High-voltage AC Current Limiter of 500kV and Above | |
| Zhou et al. | Coupling and decoupling network for surge immunity test on power lines | |
| Xuni et al. | Study on 330kV GIS Transient Enclosure Voltage Caused by Disconnecting Switch Operation | |
| CN113740640B (en) | Line impedance stabilization network structure suitable for pulse current injection | |
| Barbieri et al. | Transients due to multiple prestrike phenomenon when energizing capacitor banks with a vacuum circuit-breaker | |
| Orjuela et al. | Transient overvoltage in distribution networks in rural areas | |
| Georgiev et al. | Transients in Power Systems with a Large Share of HV Cables | |
| CN220935022U (en) | Cavity type electromagnetic compatible power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 86, room 406, No.1, Yichuang street, Zhongxin Guangzhou Knowledge City, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Southern Power Grid Digital Grid Research Institute Co.,Ltd. Country or region after: China Address before: Room 86, room 406, No.1, Yichuang street, Zhongxin Guangzhou Knowledge City, Huangpu District, Guangzhou City, Guangdong Province Patentee before: Southern Power Grid Digital Grid Research Institute Co.,Ltd. Country or region before: China |
|
| CP03 | Change of name, title or address |