CN203071593U - Automatic grid-connected circuit - Google Patents
Automatic grid-connected circuit Download PDFInfo
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- CN203071593U CN203071593U CN 201320008750 CN201320008750U CN203071593U CN 203071593 U CN203071593 U CN 203071593U CN 201320008750 CN201320008750 CN 201320008750 CN 201320008750 U CN201320008750 U CN 201320008750U CN 203071593 U CN203071593 U CN 203071593U
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- switch
- relay
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- parallel circuit
- automatic
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Abstract
The utility model discloses an automatic grid-connected circuit comprising an automatic synchronizing apparatus, a synchronizing relay and a prejudging switch. An output terminal of the automatic synchronizing apparatus is connected with a closing coil in a closing relay in series and an input terminal of the automatic synchronizing apparatus is connected with a first terminal of a normal-open contact of the synchronizing relay. The prejudging switch is connected with a second terminal of the normal-open contact of the synchronizing relay in series. The circuit provided by the utility model is provided with the prejudging switch for increasing a protective barrier; when the automatic synchronizing apparatus is in a fault state, safe problems are not easy to appear, so that an automatic grid-connected is relatively safe and reliable.
Description
Technical field
The utility model relates to for the distribution field, especially, relates to a kind of auto-parallel circuit.
Background technology
The existing auto-parallel circuit that is incorporated into the power networks for generating set and electrical network is finished by automatic paralleling device 1 (as: DCAP-5511) fully, automatic paralleling device 1 monitor voltage is poor, difference on the frequency level and phase difference select the desirable time to send closing pulse, makes breaker closing.As shown in Figure 1, automatic paralleling device 1 is gathered voltage, frequency and the phase sequence of generating set and electrical network respectively by two collection terminals, when satisfying three conditions being incorporated into the power networks: when the voltage of generator, frequency and phase sequence are consistent with the relevant parameter of electrical network, first the same period coil 31 and second the same period coil 32 must; The same period relay normally opened contact 33 closures, and automatic paralleling device 1 sends switching signal, make closing coil 21 in the closing relay 2 electric, the normally opened contact 22(of the closing relay switch that namely closes a floodgate) closure, thereby make generating set be connected to the grid.
When automatic paralleling device 1 was out of order, above-mentioned auto-parallel circuit may appear at the mistake that is incorporated into the power networks, thereby caused serious consequence.
The utility model content
The utility model purpose is to provide a kind of safe and reliable auto-parallel circuit, the wrong technical problem that is incorporated into the power networks may occur to solve when the automatic paralleling device is out of order.
For achieving the above object, provide a kind of auto-parallel circuit according to the utility model, comprise the automatic paralleling device, the output of described automatic paralleling device is connected with the closing coil in the closing relay, the input of described automatic paralleling device is connected with first end of normally opened contact of described same period of relay, described auto-parallel circuit also comprises: the anticipation switch, described anticipation switch is connected with second end of normally opened contact of described same period of relay.
Further, described anticipation switch is normal open switch, and the trigger end of described normal open switch links to each other with the output of PLC controller.
Further, two of described PLC controller inputs link to each other with plural supply line to be incorporated into the power networks respectively.
Further, described supply line quantity described to be incorporated into the power networks is two, is respectively generator and electrical network.
The utlity model has following beneficial effect:
Auto-parallel circuit of the present utility model arranges the anticipation switch at the input of automatic paralleling device, can increase the protection barrier one, is difficult for causing safety problem when the automatic paralleling device is out of order, and makes auto-parallel process safety and reliability.
Except purpose described above, feature and advantage, the utility model also has other purpose, feature and advantage.With reference to figure, the utility model is described in further detail below.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present utility model, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the circuit theory schematic diagram of existing auto-parallel circuit; And
Fig. 2 is the circuit theory schematic diagram of the auto-parallel circuit of the utility model preferred embodiment.
Marginal data:
1, automatic paralleling device; 2, closing relay; 21, closing coil; 22, the normally opened contact of closing relay; 3, the same period relay; 31, first the same period coil; 32, second the same period coil; 33, the same period relay normally opened contact; 4, anticipation switch.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
Referring to Fig. 2, auto-parallel circuit of the present utility model, comprise automatic paralleling device 1, same period relay 3 and anticipation switch 4, the output of automatic paralleling device 1 is connected with the closing coil 21 in the closing relay 2, the input of automatic paralleling device 1 is connected with first end of normally opened contact 33 of the relay same period, and anticipation switch 4 is connected with second end of normally opened contact 33 of the relay same period.Anticipation switch 4 is set, can increases the protection barrier one, when automatic paralleling device 1 is out of order, be difficult for causing safety problem, make auto-parallel process safety and reliability.
In the present embodiment, anticipation switch 4 is normal open switch, and the trigger end of normal open switch links to each other with the output of PLC controller.Two inputs of PLC controller link to each other with plural supply line to be incorporated into the power networks respectively.
Now to realize that two supply lines to be incorporated into the power networks are respectively generating set and electrical network is example, the course of work of present embodiment is described:
The PLC controller is monitored the two voltage, frequency and phase sequence respectively by two inputs that link to each other with generating set and electrical network respectively, and when three's basically identical, output signal makes normal open switch (anticipation switch 4) closure; Then, voltage, frequency and the phase sequence by automatic paralleling device 1 monitoring generating set and electrical network again, when the parameters of the two satisfies the combined floodgate condition, first the same period coil 31 and second the same period coil 32; The same period relay normally opened contact 33 closures, and automatic paralleling device 1 sends switching signal, make closing coil 21 in the closing relay 2 electric, the normally opened contact 22(of the closing relay switch that namely closes a floodgate) closure, thereby make generating set be connected to the grid.
The auto-parallel circuit of present embodiment, the normal open switch realization of adopting the PLC controller to control are treated the parameters of two supply lines that are incorporated into the power networks and are carried out anticipation, and judgement and control are more accurate, and make that security reliability of the present utility model is better.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. auto-parallel circuit, comprise automatic paralleling device (1), the output of described automatic paralleling device (1) is connected with the closing coil (21) in the closing relay (2), the input of described automatic paralleling device (1) is connected with first end of normally opened contact (33) of described same period of relay, it is characterized in that described auto-parallel circuit also comprises:
Anticipation switch (4), described anticipation switch (4) is connected with second end of normally opened contact (33) of described same period of relay.
2. auto-parallel circuit according to claim 1 is characterized in that, described anticipation switch (4) is normal open switch, and the trigger end of described normal open switch links to each other with the output of PLC controller.
3. auto-parallel circuit according to claim 2 is characterized in that, two inputs of described PLC controller link to each other with plural supply line to be incorporated into the power networks respectively.
4. auto-parallel circuit according to claim 3 is characterized in that, described supply line quantity described to be incorporated into the power networks is two, is respectively generator and electrical network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320008750 CN203071593U (en) | 2013-01-08 | 2013-01-08 | Automatic grid-connected circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320008750 CN203071593U (en) | 2013-01-08 | 2013-01-08 | Automatic grid-connected circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203071593U true CN203071593U (en) | 2013-07-17 |
Family
ID=48770343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320008750 Expired - Fee Related CN203071593U (en) | 2013-01-08 | 2013-01-08 | Automatic grid-connected circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203071593U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524997A (en) * | 2018-11-16 | 2019-03-26 | 国家电网有限公司 | A method of preventing water power station control system relay tip malfunction |
| CN109932601A (en) * | 2019-03-31 | 2019-06-25 | 上海二十冶建设有限公司 | The method that the grid-connected circuit of star-like statodyne group is detected with anti-power transmission |
-
2013
- 2013-01-08 CN CN 201320008750 patent/CN203071593U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524997A (en) * | 2018-11-16 | 2019-03-26 | 国家电网有限公司 | A method of preventing water power station control system relay tip malfunction |
| CN109932601A (en) * | 2019-03-31 | 2019-06-25 | 上海二十冶建设有限公司 | The method that the grid-connected circuit of star-like statodyne group is detected with anti-power transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20180108 |
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| CF01 | Termination of patent right due to non-payment of annual fee |