CN112290548A - Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting - Google Patents
Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting Download PDFInfo
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- CN112290548A CN112290548A CN202011231754.XA CN202011231754A CN112290548A CN 112290548 A CN112290548 A CN 112290548A CN 202011231754 A CN202011231754 A CN 202011231754A CN 112290548 A CN112290548 A CN 112290548A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
Abstract
The invention discloses an automatic switching-on and switching-off device of a distribution transformer for agricultural distribution network alternating current ice melting, which is arranged on each distribution transformer module and comprises a voltage detection module, a release and a relay; the voltage detection module detects a voltage signal of the low-voltage side bus and uploads a detection result to the release and the relay; the release outputs a brake-separating signal to control the brake separation of the low-voltage circuit breaker when the voltage of the low-voltage side bus is lower than a set value; and the relay outputs a closing signal to control the low-voltage circuit breaker to close when the voltage of the low-voltage side bus is a set value. According to the invention, through voltage detection and the tripper/relay, the automatic switching-on and switching-off operation of the distribution transformer during alternating current ice melting of the agricultural distribution network is realized, and the distribution transformer has the advantages of high reliability, good practicability, safety, reliability and low cost.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to an automatic switching-on and switching-off device for a distribution transformer for agricultural distribution network alternating current ice melting.
Background
With the development of economic technology and the improvement of living standard of people, electric energy becomes essential secondary energy in production and life of people, and brings endless convenience to production and life of people. Therefore, stable and reliable operation of the power system becomes one of the most important tasks of the power system.
In China, the power grid is frequently damaged by rain and snow, and when the power transmission and distribution line is seriously iced, the tower falling and the line breaking are easily caused, so that the safe operation of the power grid is seriously threatened. And the power supply reliability of the agricultural distribution network line is very important. However, many agricultural distribution network lines are distributed in micro-terrain microclimate areas, ice is seriously coated in winter, and the power of the lines is easily cut off due to the breakage of the reversing bar, so that the normal production and domestic power consumption of people are seriously influenced.
The current ice melting is an effective means for coping with the ice coating of the agricultural distribution network line. Among various current ice melting modes, the fixed alternating current ice melting mode has large ice melting capacity and the most obvious effect. The fixed AC ice melting mode line is shown in figure 1: the fixed AC ice melting device 1 is connected with the circuit 8 through the ice melting change-over switch 3; when the transformer substation normally works, the main transformer 2 of the transformer substation supplies power to the line 8 through the line switch 4 (the line switch 4 is closed); each distribution transformer module (5, 6, 7, etc. in the figure) is connected to a line 8 and takes power, and the dotted line in the figure is broken. At this time, the ice-melting changeover switch 3 is required to be turned off. During ice melting, assuming that the line 8 is covered with ice and needs to melt ice, the line switch 4 is opened at the moment, the tail end of the line 8 is short-circuited (connected at the dotted line in the figure), then the ice melting change-over switch 3 is closed, and at the moment, the fixed type alternating current ice melting device melts ice for the line 8 to be melted ice through the ice melting change-over switch 3.
However, since the line voltage is lower than the normal power supply voltage during ice melting, in order to protect the safety of the motor loads at the user side and avoid the accident of burning the motor due to low voltage, the distribution transformer along the line to be melted is required to be disconnected before ice melting, and the distribution transformer is switched on after ice melting is finished. Specifically, the internal circuitry of each distribution transformer module is shown in fig. 2; the distribution transformer 51 takes power from the line 8, and then steps down and transmits the power to the low-voltage side bus 52, and then the low-voltage side bus 52 supplies power to the power supply load 57 through the line and the low-voltage circuit breaker 56. To ensure the safety of the customer side motor type loads, the low voltage circuit breaker 56 must be opened before ice melting begins, thereby ensuring that the customer side loads are disconnected from the grid.
However, in the case of the conventional fixed ac deicing method, there are the following problems: on one hand, the number of distribution transformer modules along a 10kV line to be de-iced is large, and the workload is huge in the mode of manually disconnecting the distribution transformers (low-voltage circuit breakers) one by one at present; on the other hand, in the case of road freezing in winter, the current manual disconnection method of the distribution transformer (low-voltage circuit breaker) requires workers to go to the site to perform operation, and the danger of the workers is high.
Disclosure of Invention
The invention aims to provide the automatic switching-on and switching-off device of the distribution transformer for the alternating-current ice melting of the rural distribution network, which has the advantages of high reliability, good practicability, safety, reliability and low cost.
The automatic switching-on and switching-off device for the distribution transformer for the agricultural distribution network alternating current ice melting is arranged on each distribution transformer module and specifically comprises a voltage detection module, a release and a relay; the input end of the voltage detection module is connected with the low-voltage side bus, and the output end of the voltage detection module is simultaneously connected with the input end of the release and the input end of the relay; the output end of the release and the output end of the relay are connected with the switching-on and switching-off control end of the low-voltage circuit breaker; the voltage detection module is used for detecting a voltage signal of the low-voltage side bus and uploading a detection result to the release and the relay; the release is used for outputting a brake-separating signal when the voltage of the low-voltage side bus is lower than a set value and controlling the low-voltage circuit breaker to separate the brake; the relay is used for outputting a closing signal when the voltage of the low-voltage side bus is a set value and controlling the low-voltage circuit breaker to close.
The set value is 220V.
The voltage detection module is an isolation transformer with a transformation ratio of 1: 1.
The tripper is a tripper of the low-voltage circuit breaker.
The relay is a time relay.
The time relay is an alternating current time relay with the model number of DS-28.
The automatic switching-on and switching-off device for the distribution transformer for the agricultural distribution network alternating current ice melting, provided by the invention, realizes the automatic switching-on and switching-off operation of the distribution transformer during the agricultural distribution network alternating current ice melting through the voltage detection and the tripper/relay, and has the advantages of high reliability, good practicability, safety, reliability and low cost.
Drawings
FIG. 1 is a schematic circuit diagram of a fixed AC ice melting method in the prior art.
Fig. 2 is a schematic diagram of the internal circuitry of a prior art distribution transformer module.
Fig. 3 is a schematic diagram of the internal circuitry of a distribution transformer module in which the apparatus of the present invention is used.
Detailed Description
Fig. 3 is a schematic diagram of the internal circuit of a distribution transformer module when the device of the present invention is applied: the automatic switching-on and switching-off device for the distribution transformer for the agricultural distribution network alternating current ice melting is arranged on each distribution transformer module and specifically comprises a voltage detection module 53, a release 55 and a relay 54; the input end of the voltage detection module is connected with the low-voltage side bus, and the output end of the voltage detection module is simultaneously connected with the input end of the release and the input end of the relay; the output end of the release and the output end of the relay are connected with the switching-on and switching-off control end of the low-voltage circuit breaker; the voltage detection module is used for detecting a voltage signal of the low-voltage side bus and uploading a detection result to the release and the relay; the release is used for outputting a brake-separating signal when the voltage of the low-voltage side bus is lower than a set value and controlling the low-voltage circuit breaker to separate the brake; the relay is used for outputting a closing signal when the voltage of the low-voltage side bus is a set value and controlling the low-voltage circuit breaker to close.
In particular, distribution transformer 51 may be a conventional commercially available S11-M-200/10/0.4 type transformer. The low-voltage side bus 52 is made into a three-phase four-wire structure by adopting 3 mm-30 mm conventional copper bars. The voltage detection module can adopt an isolation transformer with a transformation ratio of 1:1, the output of the transformer is connected with a resistor (a current-limiting resistor) in series, and the output voltage of the voltage detection module is generally 220V (a set value) or far lower than 220V. The relay is preferably a time relay, a DS-28 type alternating current time relay can be adopted, and the delay time can be set optionally; meanwhile, a closing loop of the low-voltage circuit breaker is connected to two sides of a pair of normally open nodes of the time relay in parallel; when 220V voltage is input, the normally open node of the time relay is closed, so that the closing loop of the low-voltage circuit breaker is closed, and the low-voltage circuit breaker is closed. The tripper can be arranged independently, and the tripper of the low-voltage circuit breaker can also be adopted; for example, a DZ-10-100/4-2-2 type low-voltage circuit breaker is provided with a low-voltage tripping function, and when the voltage is detected to be lower than 95 percent of the rated voltage (220V), the low-voltage circuit breaker is automatically opened. The circuit breaker state indicator is an accessory facility of the low-voltage circuit breaker, and the DZ-10-100/4-2-2 type low-voltage circuit breaker has a state indicating function.
During normal power supply and work, the voltage signal that voltage detection module detected is 220V, and time relay works this moment for low-voltage circuit breaker closes a floodgate. When ice melts, the voltage signal detected by the voltage detection module is far lower than 220V, the release loses voltage and releases, meanwhile, the time relay does not work due to too low input voltage, and the low-voltage circuit breaker is opened. When the ice melting is finished and the electricity is recovered, the voltage signal detected by the voltage detection module is recovered to 220V, at the moment, the tripper recovers the voltage and locks the voltage, the time relay is electrified and works, and the low-voltage circuit breaker is switched on again. According to the working process, the automatic opening and closing device provided by the invention can ensure the normal work of a circuit during normal work; the low-voltage circuit breaker can be automatically disconnected during ice melting, so that the user side load is disconnected with a power grid, and the safety of the user side load is ensured; meanwhile, when ice melting is completed and power is restored, switching-on of the low-voltage circuit breaker can be reliably and stably achieved again, the user side load is automatically connected with the power grid again, and power supply of the user side is recovered.
Claims (6)
1. An automatic switching-on and switching-off device of a distribution transformer for agricultural distribution network alternating current ice melting is characterized by being arranged on each distribution transformer module and specifically comprising a voltage detection module, a release and a relay; the input end of the voltage detection module is connected with the low-voltage side bus, and the output end of the voltage detection module is simultaneously connected with the input end of the release and the input end of the relay; the output end of the release and the output end of the relay are connected with the switching-on and switching-off control end of the low-voltage circuit breaker; the voltage detection module is used for detecting a voltage signal of the low-voltage side bus and uploading a detection result to the release and the relay; the release is used for outputting a brake-separating signal when the voltage of the low-voltage side bus is lower than a set value and controlling the low-voltage circuit breaker to separate the brake; the relay is used for outputting a closing signal when the voltage of the low-voltage side bus is a set value and controlling the low-voltage circuit breaker to close.
2. The automatic switching-on and switching-off device for the alternating-current deicing distribution transformer of the rural distribution network according to claim 1, wherein the set value is 220V.
3. The automatic switching-on and switching-off device for the alternating-current deicing distribution transformer of the rural distribution network according to claim 1, wherein the voltage detection module is an isolation transformer with a transformation ratio of 1: 1.
4. The automatic switching-on and switching-off device for the alternating current deicing distribution transformer of the rural power distribution network according to claim 1, wherein the release is a release of a low-voltage circuit breaker.
5. The automatic switching-on and switching-off device for the alternating current deicing distribution transformer of the rural power distribution network according to any one of claims 1 to 4, wherein the relay is a time relay.
6. The automatic switching-on and switching-off device for the alternating current deicing distribution transformer of the rural distribution network according to claim 5, wherein the time relay is a DS-28 type alternating current time relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231754.XA CN112290548A (en) | 2020-11-06 | 2020-11-06 | Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011231754.XA CN112290548A (en) | 2020-11-06 | 2020-11-06 | Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting |
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| CN112290548A true CN112290548A (en) | 2021-01-29 |
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| CN202011231754.XA Pending CN112290548A (en) | 2020-11-06 | 2020-11-06 | Automatic switching-on and switching-off device of distribution transformer for agricultural distribution network alternating current ice melting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115332014A (en) * | 2022-08-02 | 2022-11-11 | 中铁建电气化局集团第三工程有限公司 | Railway traction power supply circuit and transformer control device |
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| WO2003010787A1 (en) * | 2001-07-23 | 2003-02-06 | Abb Service S.R.L. | Kinematic mechanism for a low-voltage protection and/or current interruption device |
| CN104134589A (en) * | 2014-07-17 | 2014-11-05 | 正泰集团股份有限公司 | Low-voltage circuit breaker with residual current trip device |
| CN107394734A (en) * | 2017-08-30 | 2017-11-24 | 国网湖南省电力公司 | The exchange de-icing method of 35kV distribution network lines |
| CN107516846A (en) * | 2017-08-30 | 2017-12-26 | 国网湖南省电力公司 | New de-icing method for agriculture distribution |
| CN108092411A (en) * | 2018-01-23 | 2018-05-29 | 河南丰源电力科技有限公司 | A kind of monitor control system |
| CN207835153U (en) * | 2018-01-23 | 2018-09-07 | 河南丰源电力科技有限公司 | A kind of monitor control system |
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2020
- 2020-11-06 CN CN202011231754.XA patent/CN112290548A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003010787A1 (en) * | 2001-07-23 | 2003-02-06 | Abb Service S.R.L. | Kinematic mechanism for a low-voltage protection and/or current interruption device |
| CN104134589A (en) * | 2014-07-17 | 2014-11-05 | 正泰集团股份有限公司 | Low-voltage circuit breaker with residual current trip device |
| CN107394734A (en) * | 2017-08-30 | 2017-11-24 | 国网湖南省电力公司 | The exchange de-icing method of 35kV distribution network lines |
| CN107516846A (en) * | 2017-08-30 | 2017-12-26 | 国网湖南省电力公司 | New de-icing method for agriculture distribution |
| CN108092411A (en) * | 2018-01-23 | 2018-05-29 | 河南丰源电力科技有限公司 | A kind of monitor control system |
| CN207835153U (en) * | 2018-01-23 | 2018-09-07 | 河南丰源电力科技有限公司 | A kind of monitor control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115332014A (en) * | 2022-08-02 | 2022-11-11 | 中铁建电气化局集团第三工程有限公司 | Railway traction power supply circuit and transformer control device |
| CN115332014B (en) * | 2022-08-02 | 2023-06-20 | 中铁建电气化局集团第三工程有限公司 | Railway traction power supply circuit and transformer control device |
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Application publication date: 20210129 |
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