CN113572146A - Secondary system strong current intrusion prevention protection device and method thereof - Google Patents

Secondary system strong current intrusion prevention protection device and method thereof Download PDF

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Publication number
CN113572146A
CN113572146A CN202110851432.3A CN202110851432A CN113572146A CN 113572146 A CN113572146 A CN 113572146A CN 202110851432 A CN202110851432 A CN 202110851432A CN 113572146 A CN113572146 A CN 113572146A
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China
Prior art keywords
coil
port
current
contact
output port
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CN202110851432.3A
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Chinese (zh)
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曹拯瑜
曹晓科
赵小红
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Sichuan Xinxingyuan Technology Co ltd
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Sichuan Xinxingyuan Technology Co ltd
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Priority to CN202110851432.3A priority Critical patent/CN113572146A/en
Publication of CN113572146A publication Critical patent/CN113572146A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/24Electromagnetic mechanisms
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention provides a device and a method for preventing a secondary system from being invaded by strong current, wherein the device comprises a pair of coils, namely a coil II and a coil I, wherein the coil II and the coil I are formed by tightly winding two winding wires in parallel, and a magnetic core is arranged in the coil; the second coil is connected with the second coil input port and the second coil output port; the coil is connected with a coil I input port and a coil I output port; the output port of the coil II and the output port of the coil I are respectively connected with a surge protection device; the surge protection device is grounded; the input port of the coil II and the input port of the coil I are respectively connected with the port I of the control cable of the substation and the port II of the control cable of the substation; and the output port of the second coil and the output port of the first coil are respectively connected with the port I of the isolating switch control box and the port II of the isolating switch control box. The invention is used for controlling the isolating switch by alternating current or direct current, and can effectively prevent the invasion of strong current to a secondary system when the strong current of a primary system is introduced by short circuit or the strong current of lightning stroke invades.

Description

Secondary system strong current intrusion prevention protection device and method thereof
Technical Field
The invention belongs to the field of overcurrent and protection thereof, and relates to a device and a method for preventing a secondary system from being invaded by strong current, wherein the method can be used for controlling an isolating switch by direct current or alternating current, and can prevent the situation that when external overcurrent or internal overcurrent occurs at the isolating switch, the overcurrent invades other parts of the secondary system through a cable of an electric operating mechanism or a control mechanism of the isolating switch to cause damage to other parts of the secondary system.
Background
Through years of high-speed railway construction and high-speed transformation of existing railways, China has possessed the highest-scale and highest-operation-speed high-speed railway network all over the world at present. All a large number of secondary equipment for traction substation, such as a comprehensive automation system, comprise secondary equipment such as relay protection, monitoring, measurement, control and communication systems, and a large number of signal and control cables. The insulation grade of secondary system equipment is low, and when a primary system short circuit or lightning stroke occurs, a large amount of equipment is easy to break down, and the normal operation of a substation is seriously influenced. In recent years, after a plurality of electric disconnecting switches of the contact network are short-circuited at a primary part in China, overcurrent enters a secondary system of a substation along a secondary cable of the disconnecting switch, and an accident that a large amount of secondary equipment in the substation is damaged is caused.
Disclosure of Invention
In view of the above technical problems, the present invention provides a protection device and method for preventing a secondary system from being invaded by a strong current.
The specific technical scheme is as follows:
the secondary system strong current intrusion prevention protection device comprises a pair of coils, namely a coil II and a coil I, wherein the coil II and the coil I are formed by tightly winding two winding wires in parallel, and a magnetic core is arranged in each coil;
the second coil is connected with the second coil input port and the second coil output port;
the coil is connected with a coil I input port and a coil I output port;
the output port of the second coil and the output port of the first coil are respectively connected with a surge protection device; the surge protection device is grounded;
the input port of the coil II and the input port of the coil I are respectively connected with the port I of the control cable of the substation and the port II of the control cable of the substation;
and the output port of the second coil and the output port of the first coil are respectively connected with the port I of the isolating switch control box and the port II of the isolating switch control box.
The magnetic core is an inductance magnetic core.
Or the magnetic core is an inductance closed state magnetic core.
The magnetic core is a soft iron core.
The protection method of the device for preventing the secondary system from being invaded by the strong current comprises the following steps:
when the system normally works, control current flows out of the first port of the control cable of the substation, flows into the second coil through the second input port of the coil, flows out of the second output port of the coil, flows into the isolating switch control box through the first port of the isolating switch control box, drives the isolating switch to work, flows out of the second port of the isolating switch control box, flows into the first coil through the first output port of the coil, flows out of the first input port of the coil, and flows into the substation through the second port of the control cable, and a working cycle is completed.
The current in the two coils is equal in magnitude and opposite in direction, working current is equivalent to short circuit, and normal work cannot be influenced. When the isolating switch box is invaded by a primary system short-circuit current or thunder, the invasion strong current can simultaneously pass through the isolating switch control box port I of the isolating switch control box, the isolating switch control box port II injects the coil I and the coil II, the current direction in the coil I and the coil II is the same at the moment, the invasion strong current is equivalent to an inductor, the voltage of the isolating switch control box port I on the side of the isolating switch control box and the voltage of the isolating switch control box port II can be raised, the work of a surge protection device is promoted, the invasion strong current is guided into a protection ground, and therefore the invasion strong current is prevented from damaging a secondary system.
Preferably, the device also comprises a base, wherein a supporting rod is arranged on the base, the top of the supporting rod is connected with a fixed cross rod through a self-locking device, and one end of the fixed cross rod is connected with the base through a spring;
the other end of the fixed cross bar is provided with an armature;
a first movable contact and a second movable contact are also arranged;
the first movable contact is connected with the input port of the second coil through a first movable contact leading-out wire; a normally closed stationary contact I and a normally open stationary contact I are arranged at the movable contact I, and the normally open stationary contact I is connected with a protection grounding contact I;
the moving contact II is connected with the input port of the coil I through a moving contact lead-out wire II; a normally closed stationary contact II and a normally open stationary contact II are correspondingly arranged at the movable contact II, and the normally open stationary contact II is connected with a protective grounding contact II;
the armature position corresponds to the magnetic core;
the base is also provided with a first fixed wiring point and a second fixed wiring point, the first fixed wiring point is connected with an output port of the second coil, and the second fixed wiring point is connected with an output port of the first coil.
The protection method of the device comprises the following steps:
during normal work, control current flows out from a first port of a control cable of a substation, is connected with a first normally closed static contact through a first movable contact leading-out wire, flows into a second coil through a second input port of the coil, flows out from a second output port of the coil, flows into an isolating switch control box through a first fixed wiring point and a first port of the isolating switch control box, flows out from a second port of the isolating switch control box after driving an isolating switch to work, flows into the first coil through the second fixed wiring point and the first output port of the coil, flows out from the first input port of the coil, and enters a second port of the control cable of the substation through the second normally closed static contact and the second movable contact leading-out wire, so that the control current flows into the substation, and one working cycle is completed.
Working current flows into and flows out of the first coil and the second coil through the normally closed contact, and due to the fact that the working current and the working current are equal in size and opposite in direction, generated magnetic fields are mutually offset, the armature cannot be attracted to act, and the working current cannot be influenced. When a primary system short-circuit current or thunder invades, an invading strong current can be injected into the coil I and the coil II through the port I of the isolating switch control box and the port II of the isolating switch control box at the same time, the armature is attracted to act and automatically locked when the port I of the isolating switch control box and the port II of the isolating switch control box are lifted, the normally closed static contact I and the normally closed static contact II are disconnected, and a strong current invading loop is cut off. And when the normally open static contact I and the normally open static contact II are closed, the invading strong current is introduced into a protection ground through the protection grounding contact I and the protection grounding contact II, so that the invading strong current is prevented from damaging a secondary system.
The secondary system strong current intrusion prevention protection device and the protection method thereof provided by the invention have the technical effects that: the invention can be used for controlling the isolating switch by alternating current or direct current, and mainly has the main effects that a protective belt is established between the isolating switch control box and a substation, the influence on the system in normal work can be ignored, and when a strong current of a primary system or a lightning stroke strong current is introduced due to short circuit, the invasion of the strong current to a secondary system can be effectively prevented; the protection device has lower cost, can be quickly recovered, greatly lightens the workload of maintenance and reduces the maintenance time; the invention can also be used for lightning stroke protection of a communication system and lightning stroke of a power supply system and short circuit and strong current intrusion protection between a secondary system.
Drawings
FIG. 1 is a top view of a protective device according to example 1;
FIG. 2 is a front view of the protective device of example 1;
FIG. 3 is a front view of the protective device of example 2;
FIG. 4 is a top view of the protective device of example 2;
FIG. 5 is a front view of the protector according to example 3;
FIG. 6 is a top view of the protective device of example 4;
FIG. 7 is a schematic view of the contact connection of embodiment 4;
fig. 8 is a schematic view of the installation position of the protection device of the present invention.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
Example 1
As shown in fig. 1 and 2, the device for preventing the intrusion of the strong current into the secondary system comprises a pair of coils, namely a coil two 7 and a coil one 6, wherein the coil two 7 and the coil one 6 are formed by tightly winding two winding wires in parallel, and an inductance magnetic core 5 is arranged in each coil;
the second coil 7 is connected with the second coil input port 1 and the second coil output port 4;
the first coil 6 is connected with the first coil input port 2 and the first coil output port 3;
the output port 4 of the second coil and the output port 3 of the first coil are respectively connected with a surge protection device 8; the surge protection device 8 is grounded;
as shown in fig. 8, the second coil input port 1 and the first coil input port 2 are respectively connected to the first substation control cable port 25 and the second substation control cable port 27;
and the second coil output port 4 and the first coil output port 3 are also respectively connected with a first isolating switch control box port 26 and a second isolating switch control box port 28.
Example 2
As shown in fig. 3 and 4, the protection device for preventing the intrusion of the strong current into the secondary system includes a pair of coils, i.e., a coil two 7 and a coil one 6, wherein the coil two 7 and the coil one 6 are formed by tightly winding two winding wires in parallel, and an inductance closed-state magnetic core 9 is arranged in the coil;
the second coil 7 is connected with the second coil input port 1 and the second coil output port 4;
the first coil 6 is connected with the first coil input port 2 and the first coil output port 3;
the output port 4 of the second coil and the output port 3 of the first coil are respectively connected with a surge protection device 8; the surge protection device 8 is grounded;
the input port 1 of the coil II and the input port 2 of the coil I are respectively connected with the port I25 of the control cable of the substation and the port II 27 of the control cable of the substation;
and the second coil output port 4 and the first coil output port 3 are also respectively connected with a first isolating switch control box port 26 and a second isolating switch control box port 28.
The working methods of example 1 and example 2 were both:
when the system normally works, control current flows out of a first 25 port of a control cable of a substation, flows into a second 7 port of a coil through a first 1 port of the second coil, flows out of a second 4 port of the coil, flows into the isolating switch control box through a first 26 port of the isolating switch control box, drives the isolating switch to work, flows out of a second 28 port of the isolating switch control box, flows into a first 6 port of the coil through a first 3 port of the coil, flows out of a first 2 port of the coil, and flows into the substation through a second 27 port of the control cable, and a working cycle is completed.
The current in the two coils is equal in magnitude and opposite in direction, working current is equivalent to short circuit, and normal work cannot be influenced. When the isolator case is invaded by primary system short-circuit current or thunder and lightning, the strong current of invasion can be simultaneously through isolator control case port one 26 of isolator control case, isolator control case port two pours into coil one 6 and coil two 7 into, the current direction is the same in coil one 6 and the coil two 7 this moment, be equivalent to an inductance to the strong current of invasion, can raise isolator control case side isolator control case port one 26, the voltage of isolator control case port two 28, promote surge protection device 8 work, the leading-in ground of the strong current of invasion, thereby prevent that the strong current of invasion from destroying secondary system.
Example 3
As shown in fig. 5 to 7, the device for preventing the intrusion of the strong current into the secondary system comprises a second coil 7 and a first coil 6, wherein the second coil 7 and the first coil 6 are arranged coaxially, and a soft iron core 10 is arranged in the first coil 6;
the second coil 7 is connected with the second coil input port 1 and the second coil output port 4;
the first coil 6 is connected with the first coil input port 2 and the first coil output port 3;
the output port 4 of the second coil and the output port 3 of the first coil are respectively connected with a surge protection device 8; the surge protection device 8 is grounded;
the device is characterized by further comprising a base 13, wherein a supporting rod 22 is arranged on the base 13, the top of the supporting rod 22 is connected with a fixed cross rod 21 through a self-locking device 20, and one end of the fixed cross rod 21 is connected with the base 13 through a spring 12;
the other end of the fixed cross bar 21 is provided with an armature 11;
a first movable contact 15 and a second movable contact 31 are also arranged;
the moving contact I15 is connected with the input port 1 of the coil II through a moving contact leading-out wire I23; a normally closed first static contact 14 and a normally open first static contact 16 are arranged at the position of the movable contact 15, and the normally open first static contact 16 is connected with a protective grounding contact 19;
the moving contact II 31 is connected with the input port 2 of the coil I through a moving contact leading-out wire II 24; a normally closed stationary contact II 29 and a normally open stationary contact II 32 are correspondingly arranged at the movable contact II 31, and the normally open stationary contact II 32 is connected with a protective grounding contact II 30;
the position of the armature 11 corresponds to the soft iron core 10;
the base 13 is also provided with a first fixed wiring point 17 and a second fixed wiring point 18, the first fixed wiring point 17 is connected with the second coil output port 4, and the second fixed wiring point 18 is connected with the first coil output port 3;
the input port 1 of the coil II and the input port 2 of the coil I are respectively connected with the port I25 of the control cable of the substation and the port II 27 of the control cable of the substation;
and the second coil output port 4 and the first coil output port 3 are also respectively connected with a first isolating switch control box port 26 and a second isolating switch control box port 28.
The working method comprises the following steps:
during normal operation, control current flows out from a first port 25 of a control cable of a substation, is connected into a first normally closed static contact 14 through a first movable contact leading-out wire 23, flows into a second coil 7 through a second input port 1 of the coil, flows out from a second output port 4 of the coil, flows into a disconnecting switch control box through a first fixed connection point 17 and a first port 26 of the disconnecting switch control box, flows out from a second port 28 of the disconnecting switch control box after driving the disconnecting switch to work, flows into a first coil 6 through a second fixed connection point 18 and a first output port 3 of the coil, flows out from a first input port 2 of the coil, and enters a second port 27 of the control cable of the substation through a second normally closed static contact 29 and a second movable contact leading-out wire 24, so that the control current flows into the substation, and a working cycle is completed.
Working current flows into and flows out of the first coil 6 and the second coil 7 through the normally closed contacts, and due to the fact that the working current and the working current are equal in size and opposite in direction, generated magnetic fields are mutually offset, the armature cannot be attracted to act, and the working current cannot be influenced. When a primary system short-circuit current or thunder and lightning invades, an invading strong current can be injected into the first coil 6 and the second coil 7 through the first port 26 of the isolating switch control box and the second port 28 of the isolating switch control box at the same time, the first port 26 of the isolating switch control box and the second port 28 of the isolating switch control box are lifted, the armature 11 is attracted to act and is automatically locked, the first normally-closed stationary contact 14 and the second normally-closed stationary contact 29 are disconnected, and a strong current invading loop is cut off. And when the switch is closed with the normally open first stationary contact 16 and the normally open second stationary contact 32, the invading strong current is introduced into a protection ground through the protection grounding contact 19 and the protection grounding contact 30, so that the invading strong current is prevented from damaging a secondary system.

Claims (7)

1. The secondary system strong current intrusion prevention protection device is characterized by comprising a pair of coils, namely a coil II (7) and a coil I (6), wherein the coil II (7) and the coil I (6) are formed by tightly winding two winding wires in parallel and are arranged coaxially, and a magnetic core is arranged in each coil;
the second coil (7) is connected with a second coil input port (1) and a second coil output port (4);
the coil I (6) is connected with the coil I input port (2) and the coil I output port (3);
the second coil output port (4) and the first coil output port (3) are respectively connected with a surge protection device (8); the surge protection device (8) is grounded;
the input port (1) of the coil II and the input port (2) of the coil I are respectively connected with the port I (25) of the control cable of the substation and the port II (27) of the control cable of the substation;
and the second coil output port (4) and the first coil output port (3) are also respectively connected with the first isolating switch control box port (26) and the second isolating switch control box port (28).
2. A secondary system protection against the intrusion of electric currents according to claim 1, wherein said magnetic core is an inductor core (5).
3. A secondary system protection against the ingress of electrical currents according to claim 1, wherein said magnetic core is an inductively closed magnetic core (9).
4. A secondary system protection device against the intrusion of electric current according to claim 1, wherein said magnetic core is a soft iron core (10).
5. A secondary system protection device against the intrusion of electric current according to any one of claims 1 to 4,
the device is characterized by further comprising a base (13), wherein a supporting rod (22) is arranged on the base (13), the top of the supporting rod (22) is connected with a fixed cross rod (21) through a self-locking device (20), and one end of the fixed cross rod (21) is connected with the base (13) through a spring (12);
the other end of the fixed cross bar (21) is provided with an armature (11);
a first moving contact (15) and a second moving contact (31) are also arranged;
the moving contact I (15) is connected with the input port (1) of the coil II through a moving contact leading-out wire I (23); a normally closed static contact I (14) and a normally open static contact I (16) are arranged at the position of the movable contact I (15), and the normally open static contact I (16) is connected with a protective grounding contact I (19);
the moving contact II (31) is connected with the input port (2) of the coil I through a moving contact leading-out wire II (24); a normally closed stationary contact II (29) and a normally open stationary contact II (32) are correspondingly arranged at the movable contact II (31), and the normally open stationary contact II (32) is connected with a protective grounding contact II (30);
the armature (11) position corresponds to the magnetic core;
the base (13) is also provided with a first fixed wiring point (17) and a second fixed wiring point (18), the first fixed wiring point (17) is connected with the second coil output port (4), and the second fixed wiring point (18) is connected with the first coil output port (3).
6. A protection method of a secondary system protection apparatus against intrusion of electric current according to any one of claims 1 to 4, comprising the processes of:
when the circuit normally works, control current flows out of a first port (25) of a control cable of a substation, flows into a second coil (7) through a second coil input port (1), flows out of a second coil output port (4), flows into an isolating switch control box through a first port (26) of the isolating switch control box, drives an isolating switch to work, flows out of a second port (28) of the isolating switch control box, flows into a first coil (6) through a first coil output port (3), flows out of a first coil input port (2), and flows into the substation through a second control cable port (27), and a working cycle is completed;
the current in the two coils is equal in magnitude and opposite in direction, and is equivalent to short circuit for working current; when the isolator case is invaded by primary system short-circuit current or thunder and lightning, the strong current of invasion can be simultaneously through isolator control case port one (26) of isolator control case, isolator control case port two (28) are poured into coil one (6) and coil two (7), current direction is the same in coil one (6) and coil two (7) this moment, be equivalent to an inductance to the strong current of invasion, lift isolator control case side isolator control case port one (26), the voltage of isolator control case port two (28), promote surge protection device (8) work, the leading-in ground of protection of strong current of invasion, thereby prevent that the strong current of invasion from destroying secondary system.
7. The method for protecting a secondary system against the intrusion of a strong current according to claim 5, comprising the steps of:
when the circuit normally works, control current flows out of a first port (25) of a control cable of a substation, is connected into a first normally closed static contact (14) through a first movable contact leading-out wire (23), flows into a second coil (7) through a second coil input port (1), flows out of a second coil output port (4), flows into a disconnecting switch control box through a first fixed wiring point (17) and a first port (26) of the disconnecting switch control box, flows out of a second port (28) of the disconnecting switch control box after driving the disconnecting switch to work, flows into a first coil (6) through a second fixed wiring point (18) and a first coil output port (3), flows out of a first coil input port (2), and enters a second port (27) of the control cable of the substation through a second normally closed static contact (29) and a second movable contact leading-out wire (24), so that a working cycle is completed;
working current flows into and flows out of the first coil (6) and the second coil (7) through the normally closed contacts, and because the working current and the working current are equal in magnitude and opposite in direction, generated magnetic fields are mutually offset, so that the armature cannot be attracted to act, and the working current cannot be influenced; when a primary system short-circuit current or thunder and lightning invades, an invading strong current can be injected into a coil I (6) and a coil II (7) through a first port (26) of the isolating switch control box and a second port (28) of the isolating switch control box at the same time, and when the first port (26) of the isolating switch control box and the second port (28) of the isolating switch control box are lifted, the armature (11) is attracted to act and automatically locked, so that a normally closed stationary contact I (14) and a normally closed stationary contact II (29) are disconnected, and a strong current invading loop is cut off; and the normally open static contact I (16) and the normally open static contact II (32) are closed, and the invasion strong current is introduced into a protection ground through the protection grounding contact I (19) and the protection grounding contact II (30), so that the secondary system is prevented from being damaged by the invasion strong current.
CN202110851432.3A 2021-07-27 2021-07-27 Secondary system strong current intrusion prevention protection device and method thereof Pending CN113572146A (en)

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CN202110851432.3A CN113572146A (en) 2021-07-27 2021-07-27 Secondary system strong current intrusion prevention protection device and method thereof

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Application Number Priority Date Filing Date Title
CN202110851432.3A CN113572146A (en) 2021-07-27 2021-07-27 Secondary system strong current intrusion prevention protection device and method thereof

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CN113572146A true CN113572146A (en) 2021-10-29

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892644A (en) * 1997-11-20 1999-04-06 The University Of Chicago Passive fault current limiting device
JP2004194409A (en) * 2002-12-10 2004-07-08 Nippon Kouatsu Electric Co Lightning damage protection system
CN203193267U (en) * 2013-01-31 2013-09-11 深圳洪迪实业有限公司 Video lightning protection device and video monitoring system
DE102012218261B3 (en) * 2012-10-05 2013-11-14 Bruker Hts Gmbh Inductive fault current limiter with split primary coil arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892644A (en) * 1997-11-20 1999-04-06 The University Of Chicago Passive fault current limiting device
JP2004194409A (en) * 2002-12-10 2004-07-08 Nippon Kouatsu Electric Co Lightning damage protection system
DE102012218261B3 (en) * 2012-10-05 2013-11-14 Bruker Hts Gmbh Inductive fault current limiter with split primary coil arrangement
CN203193267U (en) * 2013-01-31 2013-09-11 深圳洪迪实业有限公司 Video lightning protection device and video monitoring system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
彭雅峰;: "牵引变电所二次系统防强电侵入研究", 电气化铁道, no. 03, pages 33 - 36 *

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