CN109921380B - Protection device for preventing re-moving parallel device from reverse charging - Google Patents
Protection device for preventing re-moving parallel device from reverse charging Download PDFInfo
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- CN109921380B CN109921380B CN201910106622.5A CN201910106622A CN109921380B CN 109921380 B CN109921380 B CN 109921380B CN 201910106622 A CN201910106622 A CN 201910106622A CN 109921380 B CN109921380 B CN 109921380B
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- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Abstract
The invention discloses a protection device for preventing a re-acting parallel device from being reversely charged, which comprises a transformer, a rectifier and a relay, wherein the transformer is connected with a segmented bus, the rectifier is connected with the transformer, the control end of the relay is connected with the rectifier, and the execution end of the relay is connected with the segmented bus and the re-acting parallel device. The invention can prevent the condition of reverse charging when the parallel device is restarted and works after the fault of the sectional bus, effectively protects the power network and the equipment, and improves the safety and the reliability.
Description
Technical Field
The present invention relates to an electric power apparatus, and more particularly, to a protection device for preventing reverse charging of a parallel device operated by a restart.
Background
In the actual operation process of the transformer substation, after one voltage transformer on the sectional bus fails, the fault voltage transformer needs to be moved out of operation on the site of the transformer substation, and then the parallel voltage resets the parallel device, so that the secondary voltage of the normal voltage transformer is introduced to the secondary side of the fault voltage transformer, and the secondary voltage of the sectional bus where the fault voltage transformer is located is recovered to be normal. If the fault voltage transformer does not quit operation, the parallel device is directly connected with the parallel voltage transformer and is re-operated, the secondary voltage of the normal voltage transformer can be reversely charged to the primary side of the fault voltage transformer, so that the fault voltage transformer accident is enlarged, and the normal voltage transformer is impacted. Therefore, a protection device capable of preventing reverse charging is required to improve the safety and reliability of the power equipment.
Utility model publication No. CN204089166U discloses an intelligence PT voltage reentries and parallels device, and it has: a DSP processor; the communication interface module is connected with the DSP processor; a man-machine interface module connected with the DSP processor; the first and second voltage sampling modules are connected to the DSP processor; the switching value input module is connected with the DSP processor; the DSP processor is connected with the logic control module, the logic control module is provided with an output logic control circuit connected with the DSP processor, and the output logic control circuit is connected with a measuring voltage resetting and paralleling relay module, a protecting voltage resetting and paralleling relay module and a metering voltage resetting and paralleling relay module. The device is used for collecting the voltage of two sections of sectional buses PT, has the functions of two sections of PT voltage relocation and two sections of PT voltage paralleling, and is applied to the field of PT voltage relocation and voltage paralleling of 110KV and below voltage levels.
The voltage re-actuation parallel device in the comparison file has the advantages of complex structure, higher cost, and lower safety and reliability.
Disclosure of Invention
The invention discloses a protection device for preventing a re-moving parallel device from being reversely charged, aiming at the problems of complex structure, higher cost and lower safety and reliability in the prior art, and the protection device can prevent the re-moving parallel device from being reversely charged when a segmented bus voltage fails, and effectively improve the safety and reliability of power equipment and a network.
The technical scheme of the invention is as follows.
The protection device comprises a transformer, a rectifier and a relay, wherein the transformer is connected with a segmented bus, the rectifier is connected with the transformer, the control end of the relay is connected with the rectifier, and the execution end of the relay is connected with the segmented bus and the rereeling parallel device. The low-voltage alternating current is led out from the segmented bus through the transformer, the low-voltage alternating current is converted into the direct current through the rectifier, the direct current controls the relay, when the voltage of the segmented bus breaks down, the alternating current output by the transformer and the direct current output by the rectifier both change greatly to cause the change of the switch of the relay, so that the connection between the segmented bus and the re-moving parallel device is cut off, the condition of reverse charging after the segmented bus is started is prevented, and the safety is improved.
Preferably, the relay comprises an electromagnet, an armature and a clamp, the electromagnet is connected with the rectifier, the armature is detachably connected with the clamp, the armature is electrically connected with the segmented bus, and the clamp is electrically connected with the re-moving parallel device. When the electromagnet normally works, the armature is stressed uniformly and is clamped by the clamp, the circuit is conducted, when the current applied to the electromagnet changes, the armature is stressed unbalance, slides out of the clamp, and the circuit is cut off.
Preferably, the armature comprises a rotating rod and a contact arranged at one end of the rotating rod, a spring is arranged on one side of the rotating rod, which is close to the electromagnet, when the armature is closed and conducted with the clamp, the spring is in a compressed state, the contact is connected with the segmented bus, and the contact is detachably connected with the clamp. When the armature works normally, the armature is under the elastic force of the spring and the attractive force of the electromagnet in the opposite direction, the difference of the numerical values of the two forces is small, and the armature is clamped by the clamp stably and cannot slide. When the attraction of the electromagnet is increased and the attraction is obviously larger than the elastic force, the armature iron is closed towards the direction of the electromagnet, slides out of the clamp and cuts off the execution end circuit; when the attraction of the electromagnet is reduced and the attraction is obviously smaller than the elastic force, the armature slides away from the electromagnet, and the power supply is cut off. The armature is disconnected from the clamp whenever the voltage of the segment bus fails.
Preferably, the clamp comprises a pair of clamping rods and a contact piece which are symmetrically arranged, the contact piece is rotatably connected with one end of each clamping rod, the contact piece is abutted to the contact, the other end of each clamping rod is fixed, a spring is arranged between the two clamping rods, the spring works in a stretching state, the contact piece is used for increasing the contact area with the contact, sufficient contact is guaranteed during normal work, when the contact slides out, the resistance borne by the contact is reduced through the rotatable contact piece, and the reliability is improved.
Preferably, the contact is triangular, and the contact portion of the contact with the contact piece is an inclined surface. Here based on the movement path of the contact.
Preferably, the control end of the standby relay is connected with the rectifier, and the execution end of the standby relay is connected with the execution end of the main relay in series. In order to prevent the main relay from being out of order, the standby relay can effectively improve the reliability.
Preferably, an insulating layer is provided on the outer sides of the contact piece and the clamping bar. After the armature is disconnected from the clamp, the armature can not be automatically switched on again under the condition of non-active operation, so that danger in maintenance is prevented, and the safety is improved.
The invention has the beneficial effects that: the anti-charging of the re-acting parallel device during working is prevented, the power network and the equipment are protected, and the safety and the reliability are improved.
Drawings
FIG. 1 is a schematic view of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of an embodiment of the present invention;
FIG. 3 is a connection diagram of an embodiment of the present invention in a power grid;
in the figure: 1-transformer, 2-rectifier, 3-armature, 4-clamp, 5-electromagnet, 6-contact piece.
Detailed Description
The technical scheme is further explained by combining the drawings in the specification.
Example (b): as shown in fig. 1, the protection device for preventing reverse charging of the parallel device from being restarted comprises a transformer 1, a rectifier 2 and a relay, wherein the transformer 1 is connected with a segmented bus, the rectifier 2 is connected with the transformer 1, a control end of the relay is connected with the rectifier 2, and an execution end of the relay is connected with the segmented bus and the parallel device from being restarted. A low-voltage alternating current is led out from a segmented bus through a transformer 1, the low-voltage alternating current is converted into a direct current through a rectifier 2, the direct current controls a relay, when the voltage of the segmented bus breaks down, the alternating current output by the transformer 1 and the direct current output by the rectifier 2 both change greatly to cause the change of the switch of the relay, so that the connection between the segmented bus and a re-acting parallel device is cut off, the situation of reverse charging after the segmented bus is started is prevented, and the safety is improved.
In the embodiment, the relay comprises an electromagnet 5, an armature 3 and a clamp 4, wherein the electromagnet 5 is connected with the rectifier 2, the armature 3 is detachably connected with the clamp 4, the armature 3 is electrically connected with a segmented bus, and the clamp 4 is electrically connected with a resetting parallel device. When the electromagnet 5 works normally, the armature 3 is stressed uniformly and clamped by the clamp 4, the circuit is conducted, when the current applied to the electromagnet 5 changes, the armature 3 is stressed unbalanced, slides out of the clamp 4, and the circuit is cut off.
As shown in fig. 2, the armature 3 includes a rotating rod and a contact disposed at one end of the rotating rod, a spring is disposed on one side of the rotating rod close to the electromagnet 5, the spring is in a compressed state when the armature 3 is closed and conducted with the clamp 4, the contact is connected to a segmented bus, and the contact is detachably connected to the clamp 4. When the armature 3 works normally, the difference between the two forces is small due to the elastic force of the spring and the attractive force of the electromagnet 5 in the opposite direction, and the armature is clamped by the clamp 4 stably and cannot slide. When the attraction of the electromagnet 5 is increased and the attraction is obviously larger than the elastic force, the armature 3 approaches the electromagnet 5, slides out of the clamp 4 and cuts off the execution end circuit; when the attraction of the electromagnet 5 is reduced and the attraction is obviously smaller than the elastic force, the armature 3 slides in the direction far away from the electromagnet 5, and the power supply is cut off. The connection of the armature 3 to the clamp 4 is thus broken as soon as the voltage of the segment bus fails.
In this embodiment, the fixture 4 includes a pair of clamping bars and a contact piece 6 which are symmetrically arranged, the contact piece 6 is rotatably connected with one end of each clamping bar, the contact piece 6 is abutted to the contact, the other end of each clamping bar is fixed, a spring is arranged between the two clamping bars, the spring works in a stretching state, the contact piece 6 is used for increasing the contact area with the contact, sufficient contact is ensured during normal work, and when the contact slides out, the rotatable contact piece 6 reduces the resistance borne by the contact and improves the reliability.
In this embodiment, the contact is triangular, and the contact portion of the contact with the contact piece 6 is an inclined surface. Here based on the movement path of the contact.
In this embodiment, the control terminal of the standby relay is connected to the rectifier 2, and the execution terminal of the standby relay is connected in series with the execution terminal of the main relay. In order to prevent the main relay from being out of order, the standby relay can effectively improve the reliability.
In this embodiment, the outer sides of the contact piece and the clamping rod are provided with insulating layers. After the armature is disconnected from the clamp, the armature can not be automatically switched on again under the condition of non-active operation, so that danger in maintenance is prevented, and the safety is improved.
For ease of understanding, a connection diagram of the embodiment is provided, as shown in fig. 3, in which relays (1-CDJ) and (2-CDJ) are connected in series at 1-1QD7 of the first-stage bus bar, and relays (3-CDJ) and (4-CDJ) are connected in series at 1-1QD9 of the second-stage bus bar. When the I section of bus voltage change PT1 has a fault, the relays 1-CDJ (or 2-CDJ) execute actions to break the normally closed contacts, so that the circuit is broken, and the II section of bus is the same.
The beneficial effect of this embodiment does: the anti-charging of the re-acting parallel device during working is prevented, the power network and the equipment are protected, and the safety and the reliability are improved.
It should be noted that the specific examples are only used for further illustration of the technical solution and are not used for limiting the scope of the technical solution, and any modification, equivalent replacement, improvement and the like based on the technical solution should be considered as being within the protection scope of the present invention.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910106622.5A CN109921380B (en) | 2019-02-02 | 2019-02-02 | Protection device for preventing re-moving parallel device from reverse charging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910106622.5A CN109921380B (en) | 2019-02-02 | 2019-02-02 | Protection device for preventing re-moving parallel device from reverse charging |
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| Publication Number | Publication Date |
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| CN109921380A CN109921380A (en) | 2019-06-21 |
| CN109921380B true CN109921380B (en) | 2021-05-07 |
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| CN201910106622.5A Active CN109921380B (en) | 2019-02-02 | 2019-02-02 | Protection device for preventing re-moving parallel device from reverse charging |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2574208Y (en) * | 2002-04-09 | 2003-09-17 | 丁文军 | Integrative earth leakage protector |
| CN206099504U (en) * | 2016-08-30 | 2017-04-12 | 河北旭辉电气股份有限公司 | Device is side by side divided to low voltage network intelligence |
| CN108832624A (en) * | 2018-06-30 | 2018-11-16 | 国网江苏省电力有限公司连云港供电分公司 | Voltage security parallel device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4033391C2 (en) * | 1990-10-20 | 1994-06-09 | Reinhausen Maschf Scheubeck | Procedure for parallel control of step transformers |
| CN2336542Y (en) * | 1998-05-27 | 1999-09-01 | 房德育 | Automatic voltage regulating controller for parallel running of two on-load regulating transformer |
| CN201956702U (en) * | 2011-01-30 | 2011-08-31 | 湖南华自科技有限公司 | Automatic synchronous parallel device of microcomputer |
| CN203707759U (en) * | 2013-12-13 | 2014-07-09 | 国网湖南省电力公司常德检修公司 | TV parallel circuit preventing reverse charging |
| CN204089166U (en) * | 2014-09-12 | 2015-01-07 | 杭州霍夫电力自动化设备有限公司 | The heavily dynamic parallel device of intelligence PT voltage |
| CN104333119B (en) * | 2014-10-30 | 2016-06-29 | 国家电网公司 | A kind of voltage parallel device with synchronized detection function |
| CN104993388B (en) * | 2015-06-30 | 2017-04-12 | 国家电网公司 | PT (Potential Transformer) paralleling device applied to transformer substation and voltage fault automatic identification method for PT (Potential Transformer) paralleling device |
-
2019
- 2019-02-02 CN CN201910106622.5A patent/CN109921380B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2574208Y (en) * | 2002-04-09 | 2003-09-17 | 丁文军 | Integrative earth leakage protector |
| CN206099504U (en) * | 2016-08-30 | 2017-04-12 | 河北旭辉电气股份有限公司 | Device is side by side divided to low voltage network intelligence |
| CN108832624A (en) * | 2018-06-30 | 2018-11-16 | 国网江苏省电力有限公司连云港供电分公司 | Voltage security parallel device |
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| CN109921380A (en) | 2019-06-21 |
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