CN113985214B - Power supply line fault detection method based on comparison method - Google Patents
Power supply line fault detection method based on comparison method Download PDFInfo
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- CN113985214B CN113985214B CN202111311247.1A CN202111311247A CN113985214B CN 113985214 B CN113985214 B CN 113985214B CN 202111311247 A CN202111311247 A CN 202111311247A CN 113985214 B CN113985214 B CN 113985214B
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- power supply
- alarm
- alarm element
- distribution cabinet
- contactor
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000005236 sound signal Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
-
- 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
- H02H3/08—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 responsive to excess current
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Alarm Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The power supply line fault detection method based on the comparison method is characterized in that a detection unit is connected to the inlet wire end of each terminal power distribution cabinet, and the detection unit comprises an alarm element and a contactor with a coil and a spring; when normal power supply is performed, the coil is electrified to enable the contactor to act, at the moment, the outlet end of the terminal power distribution cabinet is electrified, and the alarm element is in a short circuit state; when power is off, the alarm element is connected with the contact of the contactor under the action of the spring, so that the alarm element is connected with each household line at the outlet end of the terminal power distribution cabinet in series; when the power failure is detected, a low-voltage test power supply is connected between the zero line and the live line of the main power supply line, the contactor does not act at the moment, the alarm element is electrified to alarm, and the alarm characteristic sent by the alarm element corresponding to the air switch which cannot be tripped is stronger than the alarm characteristic sent by other alarm elements. According to the invention, by comparing the alarm characteristics sent by the alarm element, the air switch with a problem can be quickly found, and the power supply recovery time is greatly shortened.
Description
Technical Field
The invention relates to the field of power supply, in particular to a power supply line fault detection method based on a comparison method.
Background
In district power supply, a main power supply line is usually used for supplying power to a plurality of residential buildings, each residential building is provided with a plurality of units, a terminal power distribution cabinet is arranged in a door opening of each unit, a total air switch is arranged in the terminal power distribution cabinet, and a plurality of lines are separated by the total air switch to supply power to residents on different floors. Therefore, the use amount of the main power supply cable can be reduced, and the main power supply cable is convenient to lay.
Most of power supply faults in a community are power failure faults caused by short circuit of household appliances or lines, and few reasons of the power supply faults are short circuit and disconnection of main power supply cables outside a building. Although each household has an air switch, when the air switch is damaged and does not work, especially when the total air switch in the terminal power distribution cabinet cannot be tripped for protection, the short circuit of any household can cause the tripping of the total control cabinet, so that all the residential buildings on the same road are powered off. The trouble shooting problem encountered at present is that before a short-circuit source is not found and removed, the power supply of most households can be recovered only by finding and replacing a damaged air switch, and the damaged air switch is not easy to find, so that the power supply recovery time of a community is seriously influenced, and great inconvenience is brought to the life of the households.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses a power supply line fault detection method based on a comparison method, which aims at: and the air switch with problems is quickly positioned and found, so that the power supply recovery time is shortened.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
A power supply line fault detection method based on a comparison method is used for finding out an air switch which can not trip in a power distribution cabinet of each terminal of a cell, and a resident line controlled by the air switch has a short circuit phenomenon, and is characterized in that: the wire inlet end of each terminal power distribution cabinet is connected with a detection unit, and the detection unit comprises an alarm element and a contactor with a coil and a spring; when normal power supply is performed, the coil is electrified to enable the contactor to act, at the moment, the outlet end of the terminal power distribution cabinet is electrified, and the alarm element is in a short circuit state; when power is off, the alarm element is connected with the contact of the contactor under the action of the spring, so that the alarm element is connected with each household line at the outlet end of the terminal power distribution cabinet in series; when power failure is detected, a low-voltage test power supply is connected between a zero line and a live line of a main power supply line, at the moment, the contactor does not act, and the alarm element is electrified to alarm; the air switch which can not trip is characterized in that the alarm characteristics sent by the corresponding alarm elements are stronger than those sent by other alarm elements.
Further improving the technical scheme, the test power supply is 24-36V direct current or alternating current.
Further improving the technical scheme, the alarm element is a buzzer or an electric loudspeaker.
Further improving the technical scheme, the alarm element is an alarm indicator lamp.
According to a further improved technical scheme, the detection unit comprises a voltage dividing resistor, and the voltage dividing resistor is connected with the coil of the contactor in series.
According to the technical scheme, the test power supply is low-voltage direct current, and the detection unit further comprises a capacitor, wherein the capacitor is connected with the divider resistor and the coil of the contactor in series.
By adopting the technical scheme, compared with the background technology, the invention has the following beneficial effects:
according to the invention, the detection unit is added in the power supply line, the alarm element in the detection unit and the power supply line form a series-parallel circuit when power is cut off, and the air switch with a problem can be rapidly positioned and found by comparing the alarm characteristics sent by the alarm element, so that the power supply recovery time is greatly shortened.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention in normal power supply.
Fig. 2 is a schematic structural diagram of the present invention in power outage detection.
In the figure: 1. an air switch; 2. a detection unit; 21. a contactor; 22. an alarm element; 23. a voltage dividing resistor; 24. a capacitor; 3. testing a power supply; 4. short-circuited parts.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. It should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
A power supply line fault detection method based on a comparison method is used for finding out an air switch 1 which cannot trip in a power distribution cabinet of each terminal of a community, and a resident line controlled by the air switch 1 has a short circuit phenomenon. As shown in fig. 1, in the present embodiment, among a plurality of residential buildings in a certain cell, a line short circuit occurs in a home of a certain resident building # 2 unit, and reference numeral 4 in the figure is a portion where the resident short circuit occurs. Because the short circuit is not eliminated, and the air switch 1 for the user and the total air switch 1 positioned in the power distribution cabinet of the No. 2 unit terminal cannot trip due to damage, the tripping of the total control cabinet can be caused, so that all residential buildings on the same way are powered off. In this case, if the trip-impossible total air switch 1 is not found and replaced, the power supply cannot be restored.
In order to solve the problems in the background art, as shown in fig. 1, a detection unit 2 is connected to the incoming line end of each terminal power distribution cabinet, and the detection unit 2 includes a contactor 21, a voltage dividing resistor 23 and an alarm element 22. The contactor 21 itself has a coil and a spring. The voltage dividing resistor 23 is connected in series with the coil of the contactor 21 between the live and neutral wires for voltage division. When the coil is normally powered, 220V commercial power is connected to enable the contactor 21 to be attracted, at the moment, the contact of the contactor 21 is connected with the conducting strip, the outlet end of the terminal power distribution cabinet is electrified, and at the moment, the alarm element 22 is in a short circuit state.
As shown in fig. 2, when the power is cut, the coil is powered off, and the alarm element 22 is connected with the contact of the contactor 21 under the action of the spring, so that the alarm element 22 is connected in series with each household line at the outlet end of the terminal power distribution cabinet. In general, the total air switch 1 in each terminal power distribution cabinet is not closed by the households when a power failure occurs, and each household cannot be completely cut off from the household appliances, so that each household appliance is in a parallel state and connected in series with the alarm element 22. In this way, the alarm element 22 forms a series-parallel connection circuit with the respective household appliance.
After a short circuit power failure occurs, when a line fault is detected, a switch of a main control cabinet is firstly disconnected, and then a low-voltage test power supply 3 is connected between a zero line and a live line of a main power supply line. In this embodiment, the test power supply 3 is 24V dc. At this time, the coil of the contactor 21 cannot generate a sufficient magnetic attraction due to the low voltage of the test power source 3, the contactor 21 does not operate, and the alarm element 22 is still in a connected state with the contacts of the contactor 21. In order to ensure that the contactor 21 is completely inactive, a capacitor 24 is connected in series between the voltage dividing resistor 23 and the coil, and the capacitor 24 is used for conducting alternating current and cutting off direct current.
24V is safe voltage, and 24V direct current or alternating current can not make household appliances of households work, and can not damage household appliances of households. Since the home appliances are in the parallel state, the total resistance after the parallel connection is smaller than a certain home appliance with the smallest resistance, so that the test power supply 3 can generate current in each alarm element 22, and the alarm element 22 alarms. The alarm element 22 can be a buzzer or an electric loudspeaker, and can alarm through sound, also can be an alarm indicator lamp, and can alarm through light emission.
For the 1# unit and the 3# unit, since the household line is not shorted, the 24V voltage of the test power supply 3 is divided by the household appliance of the household, the voltage applied to the alarm element 22 is significantly reduced, and the light signal or the sound signal emitted by the alarm element 22 is weak; for the # 2 unit, since the line of a certain resident has a short circuit phenomenon, the home appliances of each resident are short-circuited, so that the 24V voltage of the test power supply 3 is completely applied to the alarm element 22, and the alarm element 22 emits a strong light signal or sound signal. Thus, by comparing the intensity of the light signal or sound signal of each alarm element 22, the total air switch 1 which cannot be tripped can be quickly found. Then, the main air switch 1 is replaced, so that the switch can be opened to transmit power, and the power utilization of most households is ensured first. For the No. 2 unit, a resident with short circuit can be found out by adopting a household checking method, and the power supply is recovered after the short circuit fault is removed.
From the above, the invention adds the detection unit in the power supply line, and can rapidly locate and find the air switch with a problem by comparing the alarm characteristics sent by the alarm element, thereby greatly shortening the power supply recovery time.
The parts not described in detail are prior art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (6)
1. A power supply line fault detection method based on a comparison method is used for finding out an air switch which can not trip in each terminal power distribution cabinet of a cell, the cell supplies power to a plurality of residential buildings by one main power supply line, each residential building is provided with a plurality of units, the inside of a door opening of each unit is provided with the terminal power distribution cabinet, the inside of the terminal power distribution cabinet is provided with the air switch, and the resident line controlled by the air switch has a short circuit phenomenon, and the method is characterized in that: the wire inlet end of each terminal power distribution cabinet is connected with a detection unit, and the detection unit comprises an alarm element and a contactor with a coil and a spring; the coil is connected between a live wire and a zero wire of the main power supply line, and a contact of the contactor is connected with a wire inlet end of the terminal power distribution cabinet;
When the power is normally supplied, the coil is electrified to enable the contactor to act, at the moment, the outlet end of the terminal power distribution cabinet is electrified, and the alarm element is in a short circuit state; when power is off, the alarm element is connected with the contact of the contactor under the action of the spring, so that the alarm element is connected with each household line at the outlet end of the terminal power distribution cabinet in series; when power failure detection is performed, a test power supply is connected between a zero line and a live line of a main power supply line, and the test power supply is low-voltage direct current; at this time, for the terminal power distribution cabinet without short circuit, the corresponding alarm element is connected in series with the household electrical appliance of the resident, the direct current loaded on the alarm element is divided by the household electrical appliance of the resident, and the alarm element sends out a weak alarm signal; for a terminal power distribution cabinet with a short circuit, because household appliances of households are short-circuited, direct current is completely loaded on an alarm element, and the alarm element sends out a strong alarm signal; and finding out the terminal power distribution cabinet with short circuit by comparing the intensity of alarm signals of all alarm elements.
2. The method for detecting the power supply line fault based on the comparison method as claimed in claim 1, wherein the method comprises the following steps: the test power supply is 24-36V direct current or alternating current.
3. The method for detecting the power supply line fault based on the comparison method as claimed in claim 1, wherein the method comprises the following steps: the alarm element is a buzzer or an electric loudspeaker.
4. The method for detecting the power supply line fault based on the comparison method as claimed in claim 1, wherein the method comprises the following steps: the alarm element is an alarm indicator lamp.
5. The method for detecting the power supply line fault based on the comparison method as claimed in claim 1, wherein the method comprises the following steps: the detection unit comprises a voltage dividing resistor, and the voltage dividing resistor is connected with the coil of the contactor in series.
6. The contrast-based power supply line fault detection method as claimed in claim 5, wherein: the detection unit further comprises a capacitor, and the capacitor is connected with the divider resistor and the coil of the contactor in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111311247.1A CN113985214B (en) | 2021-11-08 | 2021-11-08 | Power supply line fault detection method based on comparison method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111311247.1A CN113985214B (en) | 2021-11-08 | 2021-11-08 | Power supply line fault detection method based on comparison method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113985214A CN113985214A (en) | 2022-01-28 |
| CN113985214B true CN113985214B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111311247.1A Active CN113985214B (en) | 2021-11-08 | 2021-11-08 | Power supply line fault detection method based on comparison method |
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| CN (1) | CN113985214B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457234A (en) * | 2012-05-30 | 2013-12-18 | 海洋王（东莞）照明科技有限公司 | Overvoltage protective device |
| CN103794416A (en) * | 2014-02-28 | 2014-05-14 | 浙江南峰电气有限公司 | Magnetism holding contactor |
| CN203965593U (en) * | 2014-07-29 | 2014-11-26 | 国家电网公司 | Air switch test device |
| CN205140803U (en) * | 2015-04-17 | 2016-04-06 | 徐云峰 | Short circuit automatic locking low -voltage circuit breaker |
| CN106849026A (en) * | 2017-03-30 | 2017-06-13 | 安徽徽电科技股份有限公司 | A kind of arc light protecting device and its guard method based on fast vacuum switch |
| CN110349395A (en) * | 2019-07-08 | 2019-10-18 | 河南理工大学 | Intelligence based on RSSI ranging can turn off total power switch system |
| CN211321244U (en) * | 2019-12-19 | 2020-08-21 | 广东以诺通讯有限公司 | Circuit for changing vibration intensity of motor |
| CN113078034A (en) * | 2021-04-26 | 2021-07-06 | 福建工程学院 | Household air switch device capable of automatically switching on after tripping and control method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825106A (en) * | 2022-06-06 | 2022-07-29 | 七星电气股份有限公司 | Intelligent ring main unit with fault automatic power-off function |
-
2021
- 2021-11-08 CN CN202111311247.1A patent/CN113985214B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457234A (en) * | 2012-05-30 | 2013-12-18 | 海洋王（东莞）照明科技有限公司 | Overvoltage protective device |
| CN103794416A (en) * | 2014-02-28 | 2014-05-14 | 浙江南峰电气有限公司 | Magnetism holding contactor |
| CN203965593U (en) * | 2014-07-29 | 2014-11-26 | 国家电网公司 | Air switch test device |
| CN205140803U (en) * | 2015-04-17 | 2016-04-06 | 徐云峰 | Short circuit automatic locking low -voltage circuit breaker |
| CN106849026A (en) * | 2017-03-30 | 2017-06-13 | 安徽徽电科技股份有限公司 | A kind of arc light protecting device and its guard method based on fast vacuum switch |
| CN110349395A (en) * | 2019-07-08 | 2019-10-18 | 河南理工大学 | Intelligence based on RSSI ranging can turn off total power switch system |
| CN211321244U (en) * | 2019-12-19 | 2020-08-21 | 广东以诺通讯有限公司 | Circuit for changing vibration intensity of motor |
| CN113078034A (en) * | 2021-04-26 | 2021-07-06 | 福建工程学院 | Household air switch device capable of automatically switching on after tripping and control method |
Also Published As
| Publication number | Publication date |
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| CN113985214A (en) | 2022-01-28 |
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