CN202633925U - Power-grid inverted-feed protection device - Google Patents
Power-grid inverted-feed protection device Download PDFInfo
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- CN202633925U CN202633925U CN 201220310147 CN201220310147U CN202633925U CN 202633925 U CN202633925 U CN 202633925U CN 201220310147 CN201220310147 CN 201220310147 CN 201220310147 U CN201220310147 U CN 201220310147U CN 202633925 U CN202633925 U CN 202633925U
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- 230000001681 protective effect Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 description 12
- 238000012423 maintenance Methods 0.000 description 5
- 230000003750 conditioning effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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Abstract
The utility model discloses a power-grid inverted-feed protection device. The power-grid inverted-feed protection device comprises a low-voltage main switch mounted on a low-voltage power line of a transformer. The lower-voltage power line is electrically connected with a voltage transformer and a current transformer, and output ends of the voltage transformer and the current transformer are electrically connected with a controller which computes positive and negative of active power loss according to signals acquired by the voltage transformer and the current transformer and controls output. An output end of the controller is correspondingly electrically connected with an action coil of the low-voltage main switch and is electrically connected with a display screen, and an input end of the controller is electrically connected with a keyboard. The output end of the controller is electrically connected with indicator lamps. The power inverted-feed protection device in the above structure is reasonable in structure, and the low-voltage power line can be cut off in time when in power-grid inverted feeding of users after power failure, and power utilization safety is improved. Further, the power-grid inverted-feed protection is convenient to use and particularly applicable to power lines high in power failure frequency.
Description
Technical field
The utility model relates to a kind of electrical network and send electrical protective device.
Background technology
Along with developing rapidly of electric power system construction, the probability that the user has a power failure reduces greatly, but under grid equipment maintenance or other situation, still can have a power failure to the user in short-term.The user is for not breaks in production and business, and often house generator is directly received supply network.When the user did not break off the low pressure master switch in the transformer low voltage circuit, the voltage that generator sends was delivered to electrical network after will being elevated to 10kV voltage through transformer.If have the people at line maintenance this moment, the personnel that will the cause casualty accident of getting an electric shock.Because do not have special-purpose electrical network to send electrical protective device, this type accident is of common occurrence, heavy damage the Electrical Safety and the maintenance safe of electrical network.
The utility model content
The technical problem that the utility model will solve is to provide a kind of rational in infrastructure to above-mentioned deficiency, can be after power failure user's when falling the pushing electric network timely cutoff low circuit, improve Electrical Safety, and electrical network easy to use send electrical protective device.
For solving the problems of the technologies described above; This electrical network send electrical protective device to comprise and is installed in the low pressure master switch on the transformer low voltage circuit; Its design feature is: be electrically connected with the voltage transformer summation current transformer on the low-voltage circuit; The output of voltage transformer summation current transformer is electrically connected with the positive and negative controller of controlling output that calculates active power loss according to both acquired signal, corresponding being electrically connected of actuation coil of controller output end and low pressure master switch.
The electrical network of this structure send electrical protective device be through the active loss monitoring structure realize can be after power failure user's when falling the pushing electric network timely cutoff low circuit, improve Electrical Safety, and easy to use.
The active loss monitoring structure comprises the detection part that active loss is detected, and also comprises the control assembly that carries out computing and control output according to the active loss value.Wherein, detection part comprises the voltage transformer that is connected in parallel in the transformer low voltage circuit, also comprises the current transformer that is connected in the transformer low voltage circuit.The main effect of voltage transformer is in proportion low-voltage circuit voltage transformation to be arrived lower magnitude of voltage, to adapt to the needs that subsequent conditioning circuit transforms, handles.The main effect of current transformer is that the electric current in the low-voltage circuit is reduced to lower current value in proportion, to satisfy the needs that subsequent conditioning circuit transforms, handles.Control assembly comprises the controller that is connected electrically in voltage transformer summation current transformer output, corresponding being electrically connected of control coil of the output of controller and low pressure master switch.The main effect of controller; Be that voltage induced signal and current sensing signal that the voltage transformer summation current transformer is exported are changed into direct current signal; And calculate the active loss value of transformer according to computing formula, simultaneously the active loss value that calculates is carried out logic determines.If the active loss value that calculates on the occasion of, then do not have a power failure proof at this moment and by transformer to the low-voltage circuit normal power supply.If the active loss value that calculates is a negative value, then proof has a power failure this moment, and the generator that the user provides for oneself just send to electrical network through transformer.At this moment, controller will be to the actuation coil out-put supply signal of low pressure master switch, breaks off to drive the low pressure master switch through actuation coil, has so just played to prevent that the user from sending electric effect or sending the purpose of electric protection to electrical network.
As improvement, the output of controller is electrically connected with display screen, and the input of controller is electrically connected with keyboard.
Can carry out man-machine interactive operation such as Control Parameter setting through keyboard and display screen, very convenient.
As further improvement, the output of controller also is electrically connected with indicator light.
When controller control action coil motion, controller is also luminous together with time control indicator light, has so just played and has pointed out people's effect of cutoff low circuit, and is convenient during maintenance line.
In sum, adopt the electrical network of this structure to send electrical protective device, rational in infrastructure, can be after power failure user's when falling the pushing electric network timely cutoff low circuit, improve Electrical Safety, and easy to use, the higher circuit of frequency that is particularly suitable for having a power failure uses.
Description of drawings
In conjunction with accompanying drawing the utility model is explained further details:
Fig. 1 is the structural representation of the utility model.
Among the figure: 1 is transformer, and 2 is the low pressure master switch, and 3 is voltage transformer, and 4 is current transformer, and 5 is actuation coil, and 6 is display screen, and 7 is controller, and 8 is keyboard, and 9 is indicator light, and 10 is A/D converter, and 11 is processor.
Embodiment
As shown in Figure 1, this electrical network send electrical protective device to comprise and is installed in the low pressure master switch 2 on transformer 1 low-voltage circuit, is provided with the actuation coil 5 that drives low pressure master switch 2 cutoff low circuits in the low pressure master switch 2.Be parallel with voltage transformer 3 in the low-voltage circuit of transformer 1, the main effect of voltage transformer 3 is in proportion low-voltage circuit voltage transformation to be arrived lower magnitude of voltage, to adapt to the needs that subsequent conditioning circuit transforms, handles.Also be in series with current transformer 4 in the low-voltage circuit of transformer 1, the main effect of current transformer 4 is that the electric current in the low-voltage circuit is reduced to lower current value in proportion, to satisfy the needs that subsequent conditioning circuit transforms, handles.Voltage transformer 3 summation current transformers 4 outputs are electrically connected with controller 7, corresponding being electrically connected of control coil of the output of controller 7 and low pressure master switch 2.The main effect of controller 7; Be that voltage induced signal and current sensing signal that voltage transformer 3 summation current transformers 4 are exported are changed into direct current signal; And calculate the active loss value of transformer 1 according to computing formula, simultaneously the active loss value that calculates is carried out logic determines.If the active loss value that calculates on the occasion of, then do not have a power failure proof at this moment and by transformer 1 to the low-voltage circuit normal power supply.If the active loss value that calculates is a negative value, then proof this moment has a power failure, and the generator provided for oneself of user just send to electrical network through transformer 1.At this moment, controller 7 will be to the actuation coil 5 out-put supply signals of low pressure master switch 2, break off to drive low pressure master switchs 2 through actuation coil 5, have so just played to prevent that the user from sending electric effect or sending the purpose of electric protection to electrical network.
In the present embodiment, the output of controller 7 also is electrically connected with indicator light 9.When the action of controller 7 control action coils 5, controller 7 also together with the time control indicator light 9 luminous, so just played and pointed out people's effect of cutoff low circuit, convenient during maintenance line.
Claims (3)
1. an electrical network send electrical protective device; Comprise the low pressure master switch (2) that is installed on transformer (1) low-voltage circuit; It is characterized in that: be electrically connected with voltage transformer (3) summation current transformer (4) on the low-voltage circuit; The output of voltage transformer (3) summation current transformer (4) is electrically connected with the positive and negative controller (7) of controlling output that calculates active power loss according to both acquired signal, corresponding being electrically connected of actuation coil (5) of controller (7) output and low pressure master switch (2).
2. electrical network as claimed in claim 1 send electrical protective device, it is characterized in that: the output of controller (7) is electrically connected with display screen (6), and the input of controller (7) is electrically connected with keyboard (8).
3. according to claim 1 or claim 2 electrical network send electrical protective device, and it is characterized in that: the output of controller (7) also is electrically connected with indicator light (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220310147 CN202633925U (en) | 2012-06-29 | 2012-06-29 | Power-grid inverted-feed protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220310147 CN202633925U (en) | 2012-06-29 | 2012-06-29 | Power-grid inverted-feed protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202633925U true CN202633925U (en) | 2012-12-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220310147 Expired - Fee Related CN202633925U (en) | 2012-06-29 | 2012-06-29 | Power-grid inverted-feed protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202633925U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746375A (en) * | 2014-01-15 | 2014-04-23 | 国家电网公司 | Automatic small-power supply removal device |
| CN104038244A (en) * | 2014-06-12 | 2014-09-10 | 四川联友电讯技术有限公司 | Mobile base station transceiver |
| CN104052114A (en) * | 2014-06-12 | 2014-09-17 | 四川联友电讯技术有限公司 | Mobile base station transceiver with reverse power transmission preventing function |
| CN104198832A (en) * | 2014-07-09 | 2014-12-10 | 中冶建工集团有限公司 | Comprehensive inspecting and testing method for high voltage power transformer and distribution substation |
| CN105449841A (en) * | 2016-01-20 | 2016-03-30 | 国网浙江余姚市供电公司 | A power grid system preventing inverse power transmission of a house generator |
| CN105490391A (en) * | 2016-01-20 | 2016-04-13 | 国网浙江余姚市供电公司 | House generator inverse power transmission prevention control equipment |
| CN105576669A (en) * | 2015-12-30 | 2016-05-11 | 国网浙江余姚市供电公司 | Method for preventing reactive power from being released to power network |
| CN110649700A (en) * | 2019-10-15 | 2020-01-03 | 深圳市高斯宝电气技术有限公司 | Method for preventing user circuit from reversely transmitting power to power grid |
| CN110649700B (en) * | 2019-10-15 | 2024-05-17 | 深圳市高斯宝电气技术有限公司 | Method for preventing user circuit from reversely transmitting power to power grid |
-
2012
- 2012-06-29 CN CN 201220310147 patent/CN202633925U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746375A (en) * | 2014-01-15 | 2014-04-23 | 国家电网公司 | Automatic small-power supply removal device |
| CN104038244A (en) * | 2014-06-12 | 2014-09-10 | 四川联友电讯技术有限公司 | Mobile base station transceiver |
| CN104052114A (en) * | 2014-06-12 | 2014-09-17 | 四川联友电讯技术有限公司 | Mobile base station transceiver with reverse power transmission preventing function |
| CN104198832A (en) * | 2014-07-09 | 2014-12-10 | 中冶建工集团有限公司 | Comprehensive inspecting and testing method for high voltage power transformer and distribution substation |
| CN104198832B (en) * | 2014-07-09 | 2017-03-08 | 中冶建工集团有限公司 | A kind of high pressure transformer and distribution power station Integrated Checkout test method |
| CN105576669A (en) * | 2015-12-30 | 2016-05-11 | 国网浙江余姚市供电公司 | Method for preventing reactive power from being released to power network |
| CN105449841A (en) * | 2016-01-20 | 2016-03-30 | 国网浙江余姚市供电公司 | A power grid system preventing inverse power transmission of a house generator |
| CN105490391A (en) * | 2016-01-20 | 2016-04-13 | 国网浙江余姚市供电公司 | House generator inverse power transmission prevention control equipment |
| CN110649700A (en) * | 2019-10-15 | 2020-01-03 | 深圳市高斯宝电气技术有限公司 | Method for preventing user circuit from reversely transmitting power to power grid |
| CN110649700B (en) * | 2019-10-15 | 2024-05-17 | 深圳市高斯宝电气技术有限公司 | Method for preventing user circuit from reversely transmitting power to power grid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130718 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130718 Address after: Weifang City, Shandong Province Dongfeng 261021 West Street Weicheng District No. 425 electric power building Patentee after: Shandong Electric Power Corporation Weifang Power Supply Co., Ltd. Patentee after: State Grid Corporation of China Address before: Weifang City, Shandong Province Dongfeng 261021 West Street Weicheng District No. 425 electric power building Patentee before: Shandong Electric Power Corporation Weifang Power Supply Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20170629 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |