CN113572146B - Strong current intrusion prevention protection device and method for secondary system - Google Patents
Strong current intrusion prevention protection device and method for secondary system Download PDFInfo
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- CN113572146B CN113572146B CN202110851432.3A CN202110851432A CN113572146B CN 113572146 B CN113572146 B CN 113572146B CN 202110851432 A CN202110851432 A CN 202110851432A CN 113572146 B CN113572146 B CN 113572146B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002265 prevention Effects 0.000 title claims description 4
- 230000009545 invasion Effects 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims description 13
- 230000003068 static effect Effects 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 208000025274 Lightning injury Diseases 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
- 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
- H02H9/041—Emergency 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 protection device for preventing strong current from invading of a secondary system and a method thereof, comprising a pair of coils, namely a second coil and a first coil, wherein the second coil and the first coil are formed by tightly winding two winding wires in parallel, and a magnetic core is arranged in the coils; the second coil is connected with a second coil input port and a second coil output port; the coil is connected with a coil-in port and a coil-out port; the second output port of the coil and the first output port of the 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 control cable port I of the power substation and the control cable port II of the power substation; the output port of the coil II and the output port of the coil I are also 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 alternating current or direct current control isolating switch, and can effectively prevent the invasion of strong current to a secondary system when the strong current of a primary system or the strong current of lightning stroke invades in case of short circuit.
Description
Technical Field
The invention belongs to the field of overcurrent and protection thereof, and relates to a device and a method for preventing strong current from invading a secondary system.
Background
Through high-speed railway construction for many years and high-speed transformation of the existing railway, china already has the world-wide high-speed railway network with the maximum scale and the highest operation speed at present. All the large number of secondary devices of the traction transformer, such as the comprehensive automation system, comprise relay protection, monitoring, measurement, control, communication systems and the like, and a large number of signal and control cables. The insulation grade of secondary system equipment is low, when primary system short circuit or thunderbolt take place, easily cause a large amount of equipment breakdown, seriously influence the normal operating of electric substation. In recent years, after short circuit occurs in the primary part of the electric isolating switch of the multi-contact net in China, overcurrent enters a secondary system of the substation along a secondary cable of the isolating switch, and a large number of secondary equipment in the substation is damaged.
Disclosure of Invention
The invention provides a protection device for preventing strong current from invading a secondary system and a method thereof.
The specific technical scheme is as follows:
the secondary system strong current invasion preventing protection device comprises a pair of coils, namely a second coil and a first coil, wherein the second coil and the first coil are formed by tightly winding two winding wires in parallel, and a magnetic core is arranged in the coils;
The second coil is connected with a second coil input port and a second coil output port;
the coil is connected with a coil-in port and a coil-out port;
The coil two output ports and the coil one output port are respectively connected with a surge protection device; the surge protection device is grounded;
the coil second input port and the coil first input port are respectively connected with the first substation control cable port and the second substation control cable port;
the output port of the coil II and the output port of the coil I are also 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 in an inductance closed state.
The magnetic core is a soft iron core.
The protection method of the protection device for preventing the heavy current from invading of the secondary system comprises the following steps:
When the system works normally, control current flows out from a control cable port I of the substation, flows into a coil II through an input port of the coil II, flows out from an output port of the coil II, flows into the isolating switch control box through an output port of the isolating switch control box, flows out from the output port II of the isolating switch control box after driving the isolating switch to work, flows into the coil I through an output port of the coil I, flows out from an input port of the coil I, flows into the substation through an input port of the coil II, and completes a working cycle.
The current in the two coils is equal in magnitude and opposite in direction, and the working current is equivalent to short circuit, so that normal work is not influenced. When the isolating switch box is immersed by short-circuit current or thunder of the primary system, the high-current is injected into the first coil and the second coil through the first isolating switch control box port and the second isolating switch control box port of the isolating switch control box, and the current direction of the first coil is the same as that of the second coil, so that the voltage of the first isolating switch control box port and the second isolating switch control box port of the isolating switch control box side is raised when the high-current is equivalent to an inductor, the surge protection device is pushed to work, the high-current is led into a protection ground, and the high-current is prevented from damaging the 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;
an armature is arranged at the other end of the fixed cross rod;
The movable contact I and the movable contact II are also arranged;
The first movable contact is connected with the second input port of the coil through the first movable contact lead-out wire; a normally closed fixed contact and a normally open fixed contact are arranged at the first movable contact, and the normally open fixed contact is connected with a protection grounding contact;
the second movable contact is connected with an input port of the first coil through a second movable contact outgoing line; a normally closed fixed contact II and a normally open fixed contact II are correspondingly arranged at the second movable contact, and the normally open fixed contact II is connected with the second protection 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 the output port of the second coil, and the second fixed wiring point is connected with the output port of the first coil.
The protection method of the device comprises the following steps:
During normal operation, control current flows out of a control cable port of the substation, is connected to a normally closed fixed contact through a first movable contact outgoing line, flows into a second coil through a second coil input port, flows out of an output port of the second coil, flows into a control box of the isolating switch through a first fixed connection point and a port of a control box of the isolating switch, flows out of the port of the control box of the isolating switch after driving the isolating switch to work, flows into the first coil through a second fixed connection point and an output port of the first coil, flows out of the input port of the first coil, flows into the control cable port of the substation through a second normally closed fixed contact and a second movable contact outgoing line, and flows into the substation to complete a working cycle.
The working current flows into and out of the first coil and the second coil through the normally closed contact, and the magnetic fields generated by the two coils are mutually offset due to the fact that the two coils are equal in size and opposite in direction, so that the armature is not attracted to act, and the working current is not influenced. When short-circuit current or thunder and lightning invade in the primary system, the strong invaded current can be injected into the first coil and the second coil through the first port and the second port of the isolating switch control box, and the first port and the second port of the isolating switch control box are lifted, and simultaneously, the armature is attracted to act and lock automatically, so that the first normally-closed static contact and the second normally-closed static contact are disconnected, and the strong current invaded loop is cut off. The first and second normally open static contacts are closed, and the first and second protective grounding contacts introduce the strong invasive current into the protective ground, so that the secondary system is prevented from being damaged by the strong invasive current.
The protection device for preventing heavy current intrusion of the secondary system and the protection method thereof have the technical effects that: the invention can be used for alternating current or direct current control of the isolating switch, and has the main effects that a protective belt is established between the isolating switch control box and the substation, the influence on the system in normal operation is negligible, and the invasion of strong current to the secondary system can be effectively prevented when the strong current of the primary system or the strong current of lightning stroke is invaded by short circuit; the protection device has low cost and can be quickly recovered, so that the workload of maintenance is greatly reduced and the maintenance time is shortened; the invention can also be used for lightning strike protection of a communication system and lightning strike and strong current invasion protection of short circuit between a secondary system and a lightning strike of a power supply system.
Drawings
FIG. 1 is a top view of the protective device of example 1;
FIG. 2 is a front view of the protection 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 protective device of 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 example 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 embodiments.
Example 1
As shown in fig. 1 and 2, the protection device for preventing strong current intrusion of the secondary system comprises a pair of coils, namely a second coil 7 and a first coil 6, wherein the second coil 7 and the first coil 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;
coil one 6 connects coil one input port 2 and coil one output port 3;
The coil two output port 4 and the coil one output port 3 are respectively connected with a surge protection device 8; the surge protection device 8 is grounded;
As shown in fig. 8, the coil two input port 1 and the coil one input port 2 are respectively connected with the power substation control cable port one 25 and the power substation control cable port two 27;
The coil two output port 4 and the coil one output port 3 are also respectively connected with the isolating switch control box port one 26 and the isolating switch control box port two 28.
Example 2
As shown in fig. 3 and 4, the protection device for preventing strong current intrusion of the secondary system comprises a pair of coils, namely a second coil 7 and a first coil 6, wherein the second coil 7 and the first coil 6 are formed by tightly winding two winding wires in parallel, and an inductance closed state magnetic core 9 is arranged in the coils;
the second coil 7 is connected with the second coil input port 1 and the second coil output port 4;
coil one 6 connects coil one input port 2 and coil one output port 3;
The coil two output port 4 and the coil one output port 3 are respectively connected with a surge protection device 8; the surge protection device 8 is grounded;
The coil two input port 1 and the coil one input port 2 are respectively connected with the power substation control cable port I25 and the power substation control cable port II 27;
The coil two output port 4 and the coil one output port 3 are also respectively connected with the isolating switch control box port one 26 and the isolating switch control box port two 28.
The working methods of example 1 and example 2 are:
when the system works normally, control current flows out from a first control cable port 25 of the substation, 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 port 26 of the disconnecting switch control box, flows out from a second port 28 of the disconnecting switch control box after the disconnecting switch is driven to work, flows into a first coil 6 through a first output port 3 of the coil, flows out from a first input port 2 of the coil, flows into the substation through a second port 27 of the control cable, and completes a working cycle.
The current in the two coils is equal in magnitude and opposite in direction, and the working current is equivalent to short circuit, so that normal work is not influenced. When the isolating switch box is immersed by short-circuit current or thunder of the primary system, the high-current is injected into the first coil 6 and the second coil 7 through the first isolating switch control box port 26 and the second isolating switch control box port of the isolating switch control box, and the current directions of the first coil 6 and the second coil 7 are the same at the moment.
Example 3
As shown in fig. 5 to 7, the protection device for preventing strong current intrusion of 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 on the same axis, 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;
coil one 6 connects coil one input port 2 and coil one output port 3;
The coil two output port 4 and the coil one output port 3 are respectively connected with a surge protection device 8; the surge protection device 8 is grounded;
the self-locking 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;
the movable contact I15 and the movable contact II 31 are also arranged;
the first movable contact 15 is connected with the second coil input port 1 through a first movable contact outgoing line 23; a normally closed fixed contact 14 and a normally open fixed contact 16 are arranged at the first movable contact 15, and the normally open fixed contact 16 is connected with a first protection grounding contact 19;
the second movable contact 31 is connected with the first coil input port 2 through the second movable contact outgoing line 24; a second normally closed fixed contact 29 and a second normally open fixed contact 32 are correspondingly arranged at the second movable contact 31, and the second normally open fixed contact 32 is connected with the second protective grounding contact 30;
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 output port 4 of the coil, and the second fixed wiring point 18 is connected with the first output port 3 of the coil;
The coil two input port 1 and the coil one input port 2 are respectively connected with the power substation control cable port I25 and the power substation control cable port II 27;
The coil two output port 4 and the coil one output port 3 are also respectively connected with the isolating switch control box port one 26 and the isolating switch control box port two 28.
The working method comprises the following steps:
During normal operation, control current flows out of a first electric power substation control cable port 25, is connected into a first normally closed fixed contact 14 through a first movable contact outgoing line 23, flows into a second coil 7 through a second coil input port 1, flows into an isolating switch control box through a first fixed connection point 17 and a first isolating switch control box port 26, flows out of a second isolating switch control box port 28 after driving the isolating switch to work, flows into a first coil 6 through a second fixed connection point 18 and a first coil output port 3, flows out of a first coil input port 2, flows into a second electric power substation control cable port 27 through a second normally closed fixed contact 29 and a second movable contact outgoing line 24, and flows into the electric power substation to complete a working cycle.
The working current flows into and out of the first coil 6 and the second coil 7 through the normally closed contact, and the magnetic fields generated by the two coils are mutually offset due to the fact that the two coils are equal in size and opposite in direction, so that the armature is not attracted to act, and the working current is not influenced. When the primary system short-circuit current or thunder invades, the invasion strong current can be injected into the first coil 6 and the second coil 7 through the first port 26 and the second port 28 of the isolating switch control box, and the armature 11 is attracted to act and lock automatically when the first port 26 and the second port 28 of the isolating switch control box are lifted, so that the first normally closed static contact 14 and the second normally closed static contact 29 are disconnected, and the strong current invasion loop is cut off. And the first and second normally open static contacts 16 and 32 are closed, and the first and second protective grounding contacts 19 and 30 introduce the strong invasive current into the protective ground, so that the secondary system is prevented from being damaged by the strong invasive current.
Claims (4)
1. The secondary system strong current invasion prevention protection device is characterized by comprising a pair of coils, namely a second coil (7) and a first coil (6), wherein the second coil (7) and the first coil (6) are formed by tightly winding two winding wires in parallel, the coils are arranged on the same axis, and a magnetic core is arranged in each coil;
the coil II (7) is connected with the coil II input port (1) and the coil II output port (4);
the coil I (6) is connected with the coil I input port (2) and the coil I output port (3);
the coil two output ports (4) and the coil one output port (3) are respectively connected with a surge protection device (8); the surge protection device (8) is grounded;
The coil two input port (1) and the coil one input port (2) are respectively connected with the substation control cable port I (25) and the substation control cable port II (27);
the coil two output port (4) and the coil one output port (3) are also respectively connected with the isolating switch control box port I (26) and the isolating switch control box port II (28);
the magnetic core is an inductance magnetic core (5) or a soft iron core (10);
The self-locking 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);
an armature (11) is arranged at the other end of the fixed cross bar (21);
the movable contact is also provided with a first movable contact (15) and a second movable contact (31);
The first movable contact (15) is connected with the second input port (1) of the coil through a first movable contact outgoing line (23); a normally closed fixed contact I (14) and a normally open fixed contact I (16) are arranged at the movable contact I (15), and the normally open fixed contact I (16) is connected with a protection grounding contact I (19);
The second movable contact (31) is connected with the first input port (2) of the coil through the second movable contact outgoing line (24); a normally closed fixed contact II (29) and a normally open fixed contact II (32) are correspondingly arranged at the movable contact II (31), and the normally open fixed contact II (32) is connected with the protection grounding contact II (30);
The armature (11) is positioned corresponding to the magnetic core;
The base (13) is also provided with a first fixed connection point (17) and a second fixed connection point (18), the first fixed connection point (17) is connected with the second output port (4) of the coil, and the second fixed connection point (18) is connected with the first output port (3) of the coil.
2. The secondary system protection device against high current intrusion according to claim 1, characterized in that said core is an inductance closed state core (9).
3. The protection method of the secondary system strong current invasion prevention protection device according to claim 1, comprising the following procedures:
during normal operation, control current flows out of a first control cable port (25) of the substation, flows into a second coil (7) through a second input port (1) of the coil, flows out of a second output port (4) of the coil, flows into a disconnecting switch control box through 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 first output port (3) of the coil, flows out of a first input port (2) of the coil, flows into the substation through a second port (27) of the control cable, and completes a working cycle;
the current in the two coils is equal in magnitude and opposite in direction, and the working current is equivalent to short circuit; when the isolating switch box is immersed by primary system short-circuit current or thunder, the high-current is injected into the first coil (6) and the second coil (7) through the first isolating switch control box port (26) and the second isolating switch control box port (28) of the isolating switch control box, the current direction of the first coil (6) is the same as that of the second coil (7), the high-current is equivalent to an inductor, the voltage of the first isolating switch control box port (26) and the second isolating switch control box port (28) at the isolating switch control box side is raised, the surge protection device (8) is pushed to work, the high-current is led into a protection ground, and therefore the secondary system is prevented from being damaged by the high-current.
4. A protection method of a secondary system strong current intrusion protection device according to claim 3, comprising the following procedures:
During normal operation, control current flows out of a control cable port I (25) of the substation, is connected into a normally closed fixed contact I (14) through a movable contact lead-out wire I (23), flows into a coil II (7) through a coil II input port (1), flows out of a coil II output port (4), flows into a disconnecting switch control box through a fixed connection point I (17) and a disconnecting switch control box port I (26), flows out of a disconnecting switch control box port II (28) after driving the disconnecting switch to work, flows into a coil I (6) through a fixed connection point II (18) and a coil I output port (3), flows out of a coil I input port (2), and flows into a control cable port II (27) of the substation through a normally closed fixed contact II (29) and a movable contact lead-out wire II (24), so that a working cycle is completed;
The working current flows into and out of the first coil (6) and the second coil (7) through the normally closed contact, and the magnetic fields generated by the two coils are mutually offset due to the fact that the two coils are equal in size and opposite in direction, so that the armature is not attracted to act, and the working current is not influenced; when the primary system short-circuit current or thunder invades, the invasion strong current can be injected into the coil I (6) and the coil II (7) through the isolating switch control box port I (26) and the isolating switch control box port II (28), and the armature (11) is attracted to act and lock automatically when the isolating switch control box port I (26) and the isolating switch control box port II (28) of the isolating switch control box are lifted, so that the normally closed static contact I (14) and the normally closed static contact II (29) are disconnected, and the strong current invasion loop is cut off; and the first and second normally open static contacts (16, 32) are closed, and the first and second protective grounding contacts (19, 30) are used for introducing the strong invasive current into the protective ground, so that the secondary system is prevented from being damaged by the strong invasive current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110851432.3A CN113572146B (en) | 2021-07-27 | 2021-07-27 | Strong current intrusion prevention protection device and method for secondary system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110851432.3A CN113572146B (en) | 2021-07-27 | 2021-07-27 | Strong current intrusion prevention protection device and method for secondary system |
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| CN113572146B true CN113572146B (en) | 2024-07-09 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004194409A (en) * | 2002-12-10 | 2004-07-08 | Nippon Kouatsu Electric Co | Lightning damage protection system |
Family Cites Families (4)
| 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 |
| 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 |
| CN108964000A (en) * | 2018-06-29 | 2018-12-07 | 成都交大许继电气有限责任公司 | Integrated Automation System for Traction Substation anti-lightning system |
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- 2021-07-27 CN CN202110851432.3A patent/CN113572146B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004194409A (en) * | 2002-12-10 | 2004-07-08 | Nippon Kouatsu Electric Co | Lightning damage protection system |
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