CN112072607A - Instantaneous voltage locking module for power distribution terminal - Google Patents
Instantaneous voltage locking module for power distribution terminal Download PDFInfo
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- CN112072607A CN112072607A CN202010486385.2A CN202010486385A CN112072607A CN 112072607 A CN112072607 A CN 112072607A CN 202010486385 A CN202010486385 A CN 202010486385A CN 112072607 A CN112072607 A CN 112072607A
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- 230000001052 transient effect Effects 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an instantaneous voltage locking module for a power distribution terminal, which comprises a power supply module, a voltage acquisition and comparison module electrically connected with the power supply module, and an instantaneous voltage state locking module electrically connected with the voltage acquisition and comparison module, wherein the instantaneous voltage state locking module is also electrically connected with the power supply module; the power supply module is used for converting 220V alternating current into 5V direct current and supplying the 5V direct current to a post-stage circuit for use; the voltage acquisition and comparison module is used for constantly detecting the voltage of the load side and the voltage of the power supply side of the switch, comparing the voltages with a set first threshold value, judging whether the instantaneous voltage exists or not, comparing the instantaneous voltage with a set second threshold value and judging whether the power supply state is normal or not; the instantaneous voltage state latch module is used for realizing short circuit or disconnection according to the comparison result of the voltage acquisition and comparison module and keeping on-off state after power failure. In the implementation of the invention, the transient voltage state on the line is maintained after the line loses power, and information is provided for the power distribution terminal.
Description
Technical Field
The invention relates to the technical field of distribution automation, in particular to an instantaneous voltage locking module for a distribution terminal.
Background
Modern power supply and distribution efforts are being made to raise the automation level and improve the stability of power supply and distribution, and one important aspect is to realize automatic isolation of fault lines.
If a fault exists on the line, after the upper-level switch is switched on, the upper-level switch can be immediately tripped due to the existence of the fault on the line, at the moment, the switch on the line can detect the voltage which exists and disappears instantly, and according to the industry standard, if the voltage information that the rated voltage of more than 30 percent exists on the line but the duration is more than 80ms and less than 3 seconds is detected, the voltage on the line is judged to exist instantly, which is called as instant voltage for short. The instantaneous voltage state on the distribution line can represent line faults, the switch on the existing line is automatically turned off or turned on by detecting the condition of instantaneous voltage and combining with the set waiting time, namely, if the switch on the line detects that the instantaneous voltage exists, the switch is automatically locked, and the automatic turning-on is forbidden, so that the fault line is isolated, and when the upper-stage switch is automatically turned on again, the non-fault user can be recovered to supply power, so that the fault line is automatically isolated, and the non-fault line is rapidly recovered to supply power. This function of latching the switch after detecting the transient voltage is called "transient latching".
Each switch only has the functions of opening and closing a switch, and the instantaneous voltage locking function needs to be detected and judged by a main controller in the power distribution terminal, and then the main controller controls related mechanisms to realize the locking function of the switch. In order to detect and judge the transient voltage, the power distribution terminal needs to be in a power supply working state. And the instantaneous voltage is on the premise of fault on the circuit, power transmission is tried to be carried out on the circuit, the protection action of a superior switch is triggered to be generated, if the power distribution terminal is always in a normal power supply state from the moment of last detection of the instantaneous voltage, the power distribution terminal can keep the locking function of the switch corresponding to the fault circuit, but if the middle power distribution terminal loses power supply and the electric quantity of a standby power supply in the power distribution terminal is consumed, the power distribution terminal cannot know whether the circuit is in fault during the power loss period. Under the unknown line fault state's of distribution terminal the condition, control switch closes a floodgate, can cause to close a floodgate on the fault line, leads to the tripping operation of export circuit breaker, the power failure condition appears, the power supply of numerous normal circuits is covered.
Therefore, a module is needed to record the instantaneous voltage information during the power failure of the terminal, and transmit the instantaneous voltage information to the power distribution terminal after the power distribution terminal is restarted, so as to lock the corresponding switch of the fault line and avoid switching on the fault.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an instantaneous voltage locking module for a power distribution terminal, which can keep the instantaneous voltage state which ever occurs on a recording line and is used by the power distribution terminal.
In order to solve the technical problem, an embodiment of the present invention provides an instantaneous voltage locking module for a power distribution terminal, including a power module, a voltage acquisition and comparison module electrically connected to the power module, and an instantaneous voltage state locking module electrically connected to the voltage acquisition and comparison module, where the instantaneous voltage state locking module is further electrically connected to the power module; wherein the content of the first and second substances,
the power supply module is used for converting 220V alternating current into 5V direct current and outputting the 5V direct current to be supplied to a post-stage circuit for use;
the voltage acquisition and comparison module is used for constantly detecting the voltage of a load side and the voltage of a power supply side of the switch, or comparing the voltage of the load side and the voltage of the power supply side with a set first threshold value to judge whether an instant voltage exists or not, or comparing the voltage of the load side and the voltage of the power supply side with a set second threshold value to judge whether a normal power supply state exists or not;
the instantaneous voltage state latch module is used for realizing short circuit or disconnection according to the comparison result of the voltage acquisition and comparison module and keeping on-off state after power failure.
In an optional implementation manner, the power module is an AC/DC module, the AC/DC module is connected to the voltage acquisition and comparison module, and the AC/DC module is connected to the instantaneous voltage state latch module.
In an optional embodiment, the AC/DC module takes power from a PT on a load side and a PT on a power supply side of the switch, respectively, at the same time.
In an alternative embodiment, the transient state latch module includes passive contacts.
In an alternative embodiment, the passive contacts are latching relays.
In an alternative embodiment, the number of passive contacts is two.
In the implementation of the invention, after the power distribution terminal is provided with the instantaneous voltage locking module for the power distribution terminal, the power supply does not need to be provided for the module, and only 220V alternating current of a power distribution line needs to be connected into the module in parallel, so that the design can reduce the modification amount of the module added by a user and can not increase the internal power consumption of the power distribution terminal; the output of the passive contact of the module can meet the active or passive remote signaling interfaces of different users, and the universality is high; in addition, when the line is dead and the backup power supply of the power distribution terminal is consumed, and the power distribution terminal is put into use again, the power distribution terminal judges whether a fault exists at the rear end of the line by reading the on-off state of the passive contact in the instantaneous voltage locking module of the instantaneous voltage locking module, so that the locking operation is carried out on the switch corresponding to the line with the fault, the secondary switching-on to the fault line is avoided, and the power supply stability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a distribution line of a transient voltage locking module for a distribution terminal according to an embodiment of the present invention;
fig. 2 is a schematic structural component diagram of the transient voltage locking module for the power distribution terminal in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, fig. 1 is a schematic diagram of a distribution line of a transient voltage locking module for a distribution terminal according to an embodiment of the present invention.
As shown in fig. 1, in the distribution line configured with the instantaneous voltage locking module of the present invention, CK1 and CK2 are a left substation outlet switch and a right substation outlet switch, respectively, and KG1, KG2 and KG3 are load switches on the line, and are configured with a distribution terminal, respectively; the KG2 operates in a tie switch state to avoid the situation that the transformers on two sides supply power simultaneously, and PT1 is a voltage transformer on the KG1 power supply side and is used for sensing power from a power supply side circuit and detecting the voltage on the circuit; PT2 is a voltage transformer on the load side of KG1 for sensing the voltage on the power and sense lines from the load side line.
Example two
Referring to fig. 2, fig. 2 is a schematic structural composition diagram of a transient voltage locking module for a power distribution terminal according to an embodiment of the present invention.
As shown in fig. 2, a transient voltage locking module for a distribution terminal can keep a record of a transient voltage state occurring on a line and be used by the distribution terminal.
In order to solve the above technical problem, an embodiment of the present invention provides an instantaneous voltage locking module for a power distribution terminal, including a power module 11, a voltage acquisition and comparison module 12 electrically connected to the power module 11, and an instantaneous voltage state locking module 13 electrically connected to the voltage acquisition and comparison module 12, where the instantaneous voltage state locking module 13 is further electrically connected to the power module 11.
The power module 11 is an AC/DC module, and respectively takes power from the PT on the load side and the PT on the power side of the switch at the same time. The power supply module is used for converting 220V alternating current converted from a line PT into 5V direct current and outputting the 5V direct current to be supplied to a post-stage circuit for use. The power module is used for respectively getting power from the power supply side and the load side under the condition that the circuit is not powered, so that the module can be ensured to get electric energy from the circuit even if transient voltage phenomenon exists in any direction, and the transient voltage information is latched. In the implementation of the invention, the power supply module is suitable for the current ring network power supply mode, because the instant voltage is mainly used for trying to supply power under the condition that a line is not electrified, because the fault is generated by instant tripping, the ring network can supply power from two sides, and the power supply from two sides is adopted, so that no matter which side has a fault, the power can be obtained, and as long as the duration time of the instant voltage on the line reaches 80ms, the power induced from the 80ms instant voltage is enough to support the invention to complete the latching of the instant voltage state.
The voltage acquisition and comparison module 12 is configured to detect a voltage on a load side and a voltage on a power supply side of the switch at any time, or compare the voltage on the load side and the voltage on the power supply side with a set first threshold, and determine whether an instantaneous voltage exists, or compare the voltage on the load side and the voltage on the power supply side with a set second threshold, and determine whether the power supply state is a normal power supply state. Specifically, the voltage acquisition and comparison module constantly detects voltages on the load side and the power supply side of the load switch KG1, compares the voltages with a set first threshold, and determines whether an instantaneous voltage exists, generally, the first threshold is set to be 30% of a rated voltage of a line, and the duration is greater than or equal to 80ms, that is, if a voltage greater than 30% of the rated voltage exists and the duration is greater than or equal to 80ms, it is determined that the instantaneous voltage exists on the line; and meanwhile, comparing the voltage with a set second threshold value to judge whether the power supply state is a normal power supply state, wherein the second threshold value is set to be 80% of rated voltage in a general condition and lasts for 4s, namely if the voltage which exceeds the rated voltage by 80% and the duration exceeds 4s exists on the line, the line is determined to be restored to normal power supply.
The transient voltage state latch module 13 comprises two passive contacts, the passive contacts adopt self-holding relays, and the self-holding relays are used for realizing short circuit or disconnection according to the comparison result of the voltage acquisition and comparison module and keeping on-off state after power failure; and the passive contact is used as a remote signaling state and is sent to the interior of the power distribution terminal. In the implementation of the invention, the self-holding relay has stable work and low cost; in addition, two passive contacts are adopted, different contacts can be adopted for representing faults on a user side and a power supply side respectively, and the faults are described more accurately.
In the specific implementation process of the invention, when the instantaneous voltage locking module of the power distribution terminal detects the instantaneous voltage state, the instantaneous voltage state is locked and provided for the power distribution terminal, after the power distribution terminal detects the signal, the corresponding switch KG1 is locked to prompt maintenance personnel to maintain, after the maintenance of the maintenance personnel is finished, the KG1 needs to be manually switched on or unlocked, after the switch is switched on, if the fault on the line disappears, the line recovers the normal power supply, after the voltage acquisition and comparison module 2 detects the voltage signal larger than the second threshold, the passive contact in the instantaneous voltage locking module is released, and the line recovers the normal power supply.
In the implementation of the invention, after the power distribution terminal is provided with the instantaneous voltage locking module for the power distribution terminal, the power supply does not need to be provided for the module, and only 220V alternating current of a power distribution line needs to be connected into the module in parallel, so that the design can reduce the modification amount of the module added by a user and can not increase the internal power consumption of the power distribution terminal; the output of the passive contact of the module can meet the active or passive remote signaling interfaces of different users, and the universality is high; in addition, when the line is dead and the backup power supply of the power distribution terminal is consumed, and the power distribution terminal is put into use again, the power distribution terminal judges whether a fault exists at the rear end of the line by reading the on-off state of the passive contact in the instantaneous voltage locking module of the instantaneous voltage locking module, so that the locking operation is carried out on the switch corresponding to the line with the fault, the secondary switching-on to the fault line is avoided, and the power supply stability is improved.
In addition, the above describes in detail an instantaneous voltage locking module for a power distribution terminal according to an embodiment of the present invention, and a specific example should be adopted herein to explain the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. An instantaneous voltage locking module for a power distribution terminal is characterized by comprising a power supply module, a voltage acquisition and comparison module electrically connected with the power supply module, and an instantaneous voltage state locking module electrically connected with the voltage acquisition and comparison module, wherein the instantaneous voltage state locking module is also electrically connected with the power supply module; wherein the content of the first and second substances,
the power supply module is used for converting 220V alternating current into 5V direct current and outputting the 5V direct current to be supplied to a post-stage circuit for use;
the voltage acquisition and comparison module is used for constantly detecting the voltage of a load side and the voltage of a power supply side of the switch, or comparing the voltage of the load side and the voltage of the power supply side with a set first threshold value to judge whether an instant voltage exists or not, or comparing the voltage of the load side and the voltage of the power supply side with a set second threshold value to judge whether a normal power supply state exists or not;
the instantaneous voltage state latch module is used for realizing short circuit or disconnection according to the comparison result of the voltage acquisition and comparison module and keeping on-off state after power failure.
2. The instantaneous voltage locking module for the power distribution terminal according to claim 1, wherein the power module is an AC/DC module, the AC/DC module is connected to the voltage acquisition and comparison module, and the AC/DC module is connected to the instantaneous voltage state locking module.
3. The transient voltage lockout module of claim 2 wherein the AC/DC module draws power from the load side PT and the power side PT of the switch simultaneously, respectively.
4. The transient voltage lockout module of claim 1, wherein the transient voltage condition latch module comprises passive contacts.
5. The transient voltage lockout module of claim 4 wherein the passive contacts are latching relays.
6. The transient voltage lockout module of claim 4 wherein the number of passive contacts is two.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010486385.2A CN112072607A (en) | 2020-06-01 | 2020-06-01 | Instantaneous voltage locking module for power distribution terminal |
| PCT/CN2021/093226 WO2021244242A1 (en) | 2020-06-01 | 2021-05-12 | Transient voltage locking module for power distribution terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010486385.2A CN112072607A (en) | 2020-06-01 | 2020-06-01 | Instantaneous voltage locking module for power distribution terminal |
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| CN112072607A true CN112072607A (en) | 2020-12-11 |
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| CN202010486385.2A Pending CN112072607A (en) | 2020-06-01 | 2020-06-01 | Instantaneous voltage locking module for power distribution terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021244242A1 (en) * | 2020-06-01 | 2021-12-09 | 广西电网有限责任公司电力科学研究院 | Transient voltage locking module for power distribution terminal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208094282U (en) * | 2018-03-23 | 2018-11-13 | 珠海凌晖电气有限公司 | A kind of distribution power automation terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11113160A (en) * | 1997-09-30 | 1999-04-23 | Toshiba Corp | Step-out sensing relay |
| CN103280993A (en) * | 2013-04-24 | 2013-09-04 | 南京懋德智慧能源有限公司 | AC (alternating current) power supply unit of distribution network automation terminal equipment |
| CN106771545B (en) * | 2017-01-25 | 2019-06-14 | 江苏大烨智能电气股份有限公司 | A kind of intelligent identification Method of 10kV line short fault voltage |
| CN208060618U (en) * | 2018-03-09 | 2018-11-06 | 南京南瑞继保电气有限公司 | A kind of transient fault voltage detecting writing circuit |
| CN112072607A (en) * | 2020-06-01 | 2020-12-11 | 广西电网有限责任公司电力科学研究院 | Instantaneous voltage locking module for power distribution terminal |
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- 2020-06-01 CN CN202010486385.2A patent/CN112072607A/en active Pending
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- 2021-05-12 WO PCT/CN2021/093226 patent/WO2021244242A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208094282U (en) * | 2018-03-23 | 2018-11-13 | 珠海凌晖电气有限公司 | A kind of distribution power automation terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021244242A1 (en) * | 2020-06-01 | 2021-12-09 | 广西电网有限责任公司电力科学研究院 | Transient voltage locking module for power distribution terminal |
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