CN201629583U - Automatic switching running device of distribution transformer set - Google Patents
Automatic switching running device of distribution transformer set Download PDFInfo
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- CN201629583U CN201629583U CN2010201271614U CN201020127161U CN201629583U CN 201629583 U CN201629583 U CN 201629583U CN 2010201271614 U CN2010201271614 U CN 2010201271614U CN 201020127161 U CN201020127161 U CN 201020127161U CN 201629583 U CN201629583 U CN 201629583U
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Abstract
The utility model relates to an automatic switching running device of a distribution transformer set. A high-voltage bus respectively passes through 1#/2# transformer high-voltage breakers, 1#/2# transformers and 1#/2# transformer low-voltage main input switches in the distribution transformer set to be connected with a low-voltage bus. The characteristics are as follows: current transformators and intelligent instruments which are connected with the current transformators and are used for detecting load current of the two transformers are respectively arranged between the 1#transformer and the 1# transformer low-voltage main input switch and between the 2# transformer and the 2# transformer low-voltage main input switches; a contact switch is arranged between the low-voltage buses of the two transformers; a 1# transformer closing circuit and 1# transformer tripping circuit is formed through the control circuit. In the utility model, two transformers or more that can be connected in parallel are connected in parallel to run, the transformer can be stopped in trough time period, so as to lead the other transformer to be in economical running state, and reduce idle-load loss of the transformer. In peak time period, the 1 # transformer automatically runs when the 2# transformer is in overload state, so as to avoid voltage drop of terminal client due to excess load of the transformer. The reliability of power supplying is increased.
Description
Technical field
The utility model relates to a kind of distribution transformer group automatic switching running gear.
Background technology
At present, the residential quarter of urban district implementation two above transformers that Every household has an ammeter powers is more, and distribution transformer is isolated operation.Nearly thousands of hours no-load transformer or low carrying row are arranged in the residential quarter like this, every year.There is following shortcoming in the single transformer operation:
Transformer efficiency was bigger than low-loss when 1, the single transformer low ebb moved.
2, single transformer running overload occurs peak period easily, and terminal client voltage is reduced.
3, single transformer capability of overload peak period is relatively poor.
4, during the single transformer fault, the platform district whole interruption durations of power supply are longer, cause the complaint incident easily.
The utility model content
The purpose of this utility model provides a kind of network electric power instrument device of installing on transformer high-voltage side circuit breaker and low pressure bus, realize transformers connected in parallel high pressure interlock low pressure, unloaded transformer of stoppage in transit when valley power consumption, reduce transformer noload losses, the transformer that low ebb is stopped transport in peak period puts into operation automatically, avoid a transformer to reduce, improve the distribution transformer group automatic switching running gear of two above service area power supply reliabilities because of overload causes terminal client voltage.
For achieving the above object, the technical solution adopted in the utility model is: a kind of distribution transformer group automatic switching running gear, high voltage bus 1# transformer high-voltage circuit breaker Q F1,1# transformer T1, the 1# transformer T1 low pressure master in the distribution transformer group advance switch QF4 and be connected with low-voltage bus bar; The 2# transformer high-voltage circuit breaker Q F2 of high voltage bus in the distribution transformer group, 2# transformer T2,2# transformer T2 low pressure master advances switch QF5 and is connected with low-voltage bus bar, it is characterized in that: advance between the switch QF4 at described 1# transformer T1 and 1# transformer T1 low pressure master, 2# transformer T2 and 2# transformer T2 low pressure master advance to be respectively equipped with current transformer CT1 between the switch QF5, current transformer CT2, and respectively with current transformer CT1, the intelligence instrument NTS1 that is used to detect two transformer load electric currents that current transformer CT2 connects, NTS2, be connected with underloading auxiliary relay 1-1ZJ on the intelligence instrument NTS1, be connected with underloading auxiliary relay 2-1ZJ on the intelligence instrument NTS2, overload auxiliary relay 2-2ZJ; Between the low-voltage bus bar of described two transformers, be provided with interconnection switch QF3.
The closing coil H displacement mechanical with it of described 1# transformer high-voltage circuit breaker Q F1 assists one group of normally closed contact QF1-B, overload auxiliary relay 2-2ZJ to open contact 2-2ZJ1 and connect and compose QF1 automatic closing circuit.
The breaking coil T displacement mechanical with it of described 1# transformer high-voltage circuit breaker Q F1 assists contact QF3-2, underloading auxiliary relay 2-1ZJ one group opened of normal opened contact QF1-K, interconnection switch to open contact 2-1ZJ1, underloading auxiliary relay 1-1ZJ one group and open contact 1-1ZJ1 and connect and compose QF1 automatic trip circuit.
Described 1# transformer T1 low pressure master advances the auxiliary normally closed contact QF4-B of closing coil H displacement mechanical with it of switch QF4, the contact QF1-2 that opens of 1# transformer high-voltage circuit breaker and connects and composes QF4 automatic closing circuit.
Described 1# transformer T1 low pressure master advances the auxiliary normal opened contact QF4-K of breaking coil T displacement mechanical with it of switch QF4, the contact QF3-1 that opens of interconnection switch and connects and composes QF4 automatic trip circuit.
The closing coil H displacement mechanical with it of described interconnection switch QF3 assists contact 2-1ZJ2, underloading auxiliary relay 1-1ZJ one group opened of normally closed contact QF3-B, underloading auxiliary relay 2-1ZJ to open contact 1-1ZJ2 and connect and compose QF3 automatic closing circuit.
The breaking coil T displacement mechanical with it of described interconnection switch QF3 assists the auxiliary contact QF1-1 that opens contact QF2-1,1# transformer high-voltage circuit breaker Q F1 of normal opened contact QF1-K, 2# transformer high-voltage circuit breaker, the winding point 2-2ZJ2 of overload auxiliary relay 2-2ZJ to connect and compose QF3 automatic trip circuit.
After a group of described underload relay 1-1ZJ is opened the underloading contact 1-QJ of contact 1-1ZJ3 and intelligence instrument NTS1 and connect, open contact QF1-3 with the mechanical assistance of opening contact QF2-2,1# transformer high-voltage circuit breaker of 2# transformer high-voltage circuit breaker and connect and compose 1# light transformer live road.
Another winding point 2-1ZJ3 of described underload relay 2-1ZJ and the underloading contact 2-QJ of intelligence instrument NTS2 and connect after, the mechanical assistance of opening contact QF1-4,2# transformer high-voltage circuit breaker with the mechanical assistance of 1# transformer high-voltage circuit breaker is opened contact QF2-3 and is connected and composed 2# light transformer live road.
Another winding point 2-2ZJ3 of described overload relay 2-2ZJ and the overload contact 2-GJ of intelligence instrument NTS2 and connect after, the mechanical assistance of closing contact QF1-5,2# transformer high-voltage circuit breaker with the mechanical assistance of 1# transformer high-voltage circuit breaker is opened contact QF2-3 and is connected and composed 2# transformer overload circuit.
Described QF1 automatic closing circuit, QF1 automatic trip circuit, QF4 automatic closing circuit, QF4 automatic trip circuit, QF3 automatic closing circuit, QF3 automatic trip circuit, 1# light transformer live road, 2# light transformer live road, 2# transformer overload circuit also connect.
Such scheme, the beneficial effect that the utility model adopts is as follows:
1, the transformer group parallel running more than two or two at the low-valley interval transformer of can stopping transport, makes one platform transformer at the economical operation state, can reduce by a transformer noload losses.
2, during the transformer group parallel running more than two or two, the transformer of in the time can dropping into low ebb automatically peak period, stopping transport, the mean allocation load current avoids a transformer to reduce because of overload causes terminal client voltage.Simultaneously, can strengthen power distribution station group capability of overload.
When 3, the transformer group more than two or two is moved, because of a certain transformer breaks down, the automatic loop that can manually stop transport, the interconnection switch that closes, the short time transfer load improves power supply reliability.
Other advantages of the present utility model, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can from practice of the present utility model, obtain instruction to investigating hereinafter.Target of the present utility model and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Description of drawings
Fig. 1 is the utility model main circuit theory structure schematic diagram
Fig. 2 is the utility model logic theory schematic diagram
Mark among the figure: 8-2# light transformer live road, 1-QF3 automatic trip circuit 2-QF3 automatic closing circuit 3-QF4 automatic trip circuit 4-QF4 automatic closing circuit 5-QF1 automatic trip circuit 6-QF1 automatic closing circuit 7-1# light transformer live road 9-2# transformer overload circuit
Embodiment
As shown in Figure 1 and Figure 2, a kind of distribution transformer group automatic switching running gear, high voltage bus 1# transformer high-voltage circuit breaker Q F1,1# transformer T1, the 1# transformer T1 low pressure master in the distribution transformer group advances switch QF4 and is connected with low-voltage bus bar; The 2# transformer high-voltage circuit breaker Q F2 of high voltage bus in the distribution transformer group, 2# transformer T2,2# transformer T2 low pressure master advances switch QF5 and is connected with low-voltage bus bar, it is characterized in that: advance between the switch QF4 at described 1# transformer T1 and 1# transformer T1 low pressure master, 2# transformer T2 and 2# transformer T2 low pressure master advance to be respectively equipped with current transformer CT1 between the switch QF5, current transformer CT2, and respectively with current transformer CT1, the intelligence instrument NTS1 that is used to detect two transformer load electric currents that current transformer CT2 connects, NTS2, be connected with underloading auxiliary relay 1-1ZJ on the intelligence instrument NTS1, be connected with underloading auxiliary relay 2-1ZJ on the intelligence instrument NTS2, overload auxiliary relay 2-2ZJ; Between the low-voltage bus bar of described two transformers, be provided with interconnection switch QF3.
The closing coil H displacement mechanical with it of described 1# transformer high-voltage circuit breaker Q F1 assists one group of normally closed contact QF1-B, overload auxiliary relay 2-2ZJ to open contact 2-2ZJ1 and connect and compose QF1 automatic closing circuit 6.
The breaking coil T displacement mechanical with it of described 1# transformer high-voltage circuit breaker Q F1 assists contact QF3-2, underloading auxiliary relay 2-1ZJ one group opened of normal opened contact QF1-K, interconnection switch to open contact 2-1ZJ1, underloading auxiliary relay 1-1ZJ one group and open contact 1-1ZJ1 and connect and compose QF1 automatic trip circuit 5.
Described 1# transformer T1 low pressure master advances the auxiliary normally closed contact QF4-B of closing coil H displacement mechanical with it of switch QF4, the contact QF1-2 that opens of 1# transformer high-voltage circuit breaker and connects and composes QF4 automatic closing circuit 4;
Described 1# transformer T1 low pressure master advances the auxiliary normal opened contact QF4-K of breaking coil T displacement mechanical with it of switch QF4, the contact QF3-1 that opens of interconnection switch and connects and composes QF4 automatic trip circuit 3.
The closing coil H displacement mechanical with it of described interconnection switch QF3 assists contact 2-1ZJ2, underloading auxiliary relay 1-1ZJ one group opened of normally closed contact QF3-B, underloading auxiliary relay 2-1ZJ to open contact 1-1ZJ2 and connect and compose QF3 automatic closing circuit 2.
The breaking coil T displacement mechanical with it of described interconnection switch QF3 assists the auxiliary contact QF1-1 that opens contact QF2-1,1# transformer high-voltage circuit breaker Q F1 of normal opened contact QF1-K, 2# transformer high-voltage circuit breaker, the winding point 2-2ZJ2 of overload auxiliary relay 2-2ZJ to connect and compose QF3 automatic trip circuit 1.
After a group of described underload relay 1-1ZJ is opened the underloading contact 1-QJ of contact 1-1ZJ3 and intelligence instrument NTS1 and connect, open contact QF1-3 with the mechanical assistance of opening contact QF2-2,1# transformer high-voltage circuit breaker of 2# transformer high-voltage circuit breaker and connect and compose 1# light transformer live road 7.
Another winding point 2-1ZJ3 of described underload relay 2-1ZJ and the underloading contact 2-QJ of intelligence instrument NTS2 and connect after, the mechanical assistance of opening contact QF1-4,2# transformer high-voltage circuit breaker with the mechanical assistance of 1# transformer high-voltage circuit breaker is opened contact QF2-3 and is connected and composed 2# light transformer live road 8.
Another winding point 2-2ZJ3 of described overload relay 2-2ZJ and the overload contact 2-GJ of intelligence instrument NTS2 and connect after, the mechanical assistance of closing contact QF1-5,2# transformer high-voltage circuit breaker with the mechanical assistance of 1# transformer high-voltage circuit breaker is opened contact QF2-3 and is connected and composed 2# transformer overload circuit 9.
Described QF1 automatic closing circuit 6, QF1 automatic trip circuit 5, QF4 automatic closing circuit 4, QF4 automatic trip circuit 3, QF3 automatic closing circuit 2, QF3 automatic trip circuit 1,1# light transformer live road 7,2# light transformer live road 8,2# transformer overload circuit 9 also connect.
Two transformers of 1# transformer and 2# transformer, normal operation mode are 1# transformer and 2# transformer fanout operation.Interconnection switch QF3 is at open position.
The course of work:
First logic loops:
Intelligence instrument NTS1, the NTS2 of 1#, 2# transformer configuration detects two transformer load electric currents, all be under the underloading situation that is lower than 40% load factor, and two transformers is all in operation.The intelligence instrument of 1#, 2# transformer configuration is all judged underloading contact 1-QJ, 2-QJ closure, underloading auxiliary relay 1-1ZJ2 action in the interconnection switch QF3 closing circuit, underloading auxiliary relay 2-1ZJ2 action, underloading auxiliary relay 1-1ZJ1 and underloading auxiliary relay 2-1ZJ1 self-sustaining; Interconnection switch QF3 closes a floodgate.Two transformers connected in parallel operations this moment, serial connection 1# transformer T1 low pressure master advances the normal opened contact QF3-1 closure of the interconnection switch QF3 in the switch QF4 trip(ping) circuit, 1# transformer T1 low pressure master advances switch QF4 tripping operation, and this moment, the 2# transformer belt was all loaded, the operation of 1# no-load transformer.In the serial connection 1# transformer high-voltage circuit breaker Q F1 trip(ping) circuit another is to underloading contact 1-1ZJ3,2-1ZJ3 closure, the closed 1# of startup of the contact QF3-2 of interconnection switch QF3 transformer high-voltage circuit breaker Q F1 trip(ping) circuit is tripped, the whole load operations of 2# transformer belt this moment, 1# transformer high and low pressure side is all out of service, and transformer group is finished first logical process that automaticallyes switch.
Running status switches to the whole low-voltage loads of 2# transformer belt by 1# transformer and 2# transformer belt load separately.Realize the transformer stoppage in transit of valley power consumption period, reduce by a transformer underloading and become unloaded iron loss.
Second logic loops
The intelligence instrument NTS2 of 2# transformer configuration detects 2# transformer load rate and surpasses 90%, through the intelligence instrument automatic time delay after 3 minutes, its internal overload relay 2-GJ junction closure, overload relay 2-2ZJ action, overload relay contact 2-2ZJ3 self-sustaining, electrical equipment normal opened contact 2-2ZJ2 closure in the middle of the overload of series connection 1# transformer high-voltage circuit breaker Q F1 closing circuit continues, 1# transformer high-voltage circuit breaker Q F1 closes a floodgate.This moment, the 2# transformer belt was all loaded, the operation of 1# no-load transformer.Series connection low pressure master advances the QF1-2 switch normal opened contact closure in the switch QF4 closing circuit, and low pressure master advances switch QF4 and closes a floodgate, two transformers connected in parallel operations this moment.QF1-1, QF2-1,2-2ZJ2 closure in the series connection interconnection switch QF3 low voltage liaison net switch trip loop, interconnection switch QF3 tripping operation, 1# transformer and 2# transformer fanout operation.Transformer group is finished second logical process that automatically switch.
Running status switches to 1# transformer and 2# transformer belt load separately by the whole low-voltage loads of 2# transformer belt, realizes peak electricity consumption period two transformer fanout operations, recovers original operational mode.QF1-5 is a normally closed contact, and QF1 is closure when separating brake, works in 2# transformer overload time side.
Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, other modifications that those of ordinary skills make the technical solution of the utility model or be equal to replacement, only otherwise break away from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (1)
1. distribution transformer group automatic switching running gear, high voltage bus 1# transformer high-voltage circuit breaker Q F1,1# transformer T1, the 1# transformer T1 low pressure master in the distribution transformer group advance switch QF4 and be connected with low-voltage bus bar; The 2# transformer high-voltage circuit breaker Q F2 of high voltage bus in the distribution transformer group, 2# transformer T2,2# transformer T2 low pressure master advances switch QF5 and is connected with low-voltage bus bar, it is characterized in that: advance between the switch QF4 at described 1# transformer T1 and 1# transformer T1 low pressure master, 2# transformer T2 and 2# transformer T2 low pressure master advance to be respectively equipped with current transformer CT1 between the switch QF5, current transformer CT2, and respectively with current transformer CT1, the intelligence instrument NTS1 that is used to detect two transformer load electric currents that current transformer CT2 connects, NTS2, be connected with underloading auxiliary relay 1-1ZJ on the intelligence instrument NTS1, be connected with underloading auxiliary relay 2-1ZJ on the intelligence instrument NTS2, overload auxiliary relay 2-2ZJ; Between the low-voltage bus bar of described two transformers, be provided with interconnection switch QF3;
The closing coil H displacement mechanical with it of described 1# transformer high-voltage circuit breaker Q F1 assists one group of normally closed contact QF1-B, overload auxiliary relay 2-2ZJ to open contact 2-2ZJ1 and connect and compose QF1 automatic closing circuit (6);
The breaking coil T displacement mechanical with it of described 1# transformer high-voltage circuit breaker Q F1 assists contact QF3-2, underloading auxiliary relay 2-1ZJ one group opened of normal opened contact QF1-K, interconnection switch to open contact 2-1ZJ1, underloading auxiliary relay 1-1ZJ one group and open contact 1-1ZJ1 and connect and compose QF1 automatic trip circuit (5);
Described 1# transformer T1 low pressure master advances the auxiliary normally closed contact QF4-B of closing coil H displacement mechanical with it of switch QF4, the contact QF1-2 that opens of 1# transformer high-voltage circuit breaker and connects and composes QF4 automatic closing circuit (4);
Described 1# transformer T1 low pressure master advances the auxiliary normal opened contact QF4-K of breaking coil T displacement mechanical with it of switch QF4, the contact QF3-1 that opens of interconnection switch and connects and composes QF4 automatic trip circuit (3),
The closing coil H displacement mechanical with it of described interconnection switch QF3 assists contact 2-1ZJ2, underloading auxiliary relay 1-1ZJ one group opened of normally closed contact QF3-B, underloading auxiliary relay 2-1ZJ to open contact 1-1ZJ2 and connect and compose QF3 automatic closing circuit (2);
The breaking coil T displacement mechanical with it of described interconnection switch QF3 assists the auxiliary contact QF1-1 that opens contact QF2-1,1# transformer high-voltage circuit breaker Q F1 of normal opened contact QF1-K, 2# transformer high-voltage circuit breaker, the winding point 2-2ZJ2 of overload auxiliary relay 2-2ZJ to connect and compose QF3 automatic trip circuit (1);
After a group of described underload relay 1-1ZJ is opened the underloading contact 1-QJ of contact 1-1ZJ3 and intelligence instrument NTS1 and connect, open contact QF1-3 with the mechanical assistance of opening contact QF2-2,1# transformer high-voltage circuit breaker of 2# transformer high-voltage circuit breaker and connect and compose 1# light transformer live road (7);
Another winding point 2-1ZJ3 of described underload relay 2-1ZJ and the underloading contact 2-QJ of intelligence instrument NTS2 and connect after, the mechanical assistance of opening contact QF1-4,2# transformer high-voltage circuit breaker with the mechanical assistance of 1# transformer high-voltage circuit breaker is opened contact QF2-3 and is connected and composed 2# light transformer live road (8);
Another winding point 2-2ZJ3 of described overload relay 2-2ZJ and the overload contact 2-GJ of intelligence instrument NTS2 and connect after, the mechanical assistance of closing contact QF1-5,2# transformer high-voltage circuit breaker with the mechanical assistance of 1# transformer high-voltage circuit breaker is opened contact QF2-3 and is connected and composed 2# transformer overload circuit (9);
Described QF1 automatic closing circuit (6), QF1 automatic trip circuit (5), QF4 automatic closing circuit (4), QF4 automatic trip circuit (3), QF3 automatic closing circuit (2), QF3 automatic trip circuit (1), 1# light transformer live road (7), 2# light transformer live road (8), 2# transformer overload circuit (9) also connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201271614U CN201629583U (en) | 2010-02-03 | 2010-02-03 | Automatic switching running device of distribution transformer set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201271614U CN201629583U (en) | 2010-02-03 | 2010-02-03 | Automatic switching running device of distribution transformer set |
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| Publication Number | Publication Date |
|---|---|
| CN201629583U true CN201629583U (en) | 2010-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201271614U Expired - Fee Related CN201629583U (en) | 2010-02-03 | 2010-02-03 | Automatic switching running device of distribution transformer set |
Country Status (1)
| Country | Link |
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| CN (1) | CN201629583U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683295A (en) * | 2013-11-26 | 2014-03-26 | 广东电网公司肇庆供电局 | Voltage regulating device of power distribution network |
| CN105846439A (en) * | 2016-05-10 | 2016-08-10 | 北京泰豪电力科技有限公司 | Transformer economic operation adjusting method |
| CN107482625A (en) * | 2017-08-17 | 2017-12-15 | 国网山东省电力公司枣庄供电公司 | A kind of intelligent operation/cutting system based on distribution transformer |
| CN107994568A (en) * | 2017-11-24 | 2018-05-04 | 国网北京市电力公司 | Low pressure wiring system, low pressure mode of connection and device |
| CN112152205A (en) * | 2020-09-08 | 2020-12-29 | 南京德尔森电气有限公司 | Intelligent low-voltage automatic switching management unit and management method |
| CN112751367A (en) * | 2020-12-28 | 2021-05-04 | 国网山东省电力公司枣庄供电公司 | Transformer-based electrical load regulation and control system and use method thereof |
| CN113824113A (en) * | 2021-10-14 | 2021-12-21 | 安徽省建筑设计研究总院股份有限公司 | Load rate control circuit and control method for balancing transformer |
-
2010
- 2010-02-03 CN CN2010201271614U patent/CN201629583U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683295A (en) * | 2013-11-26 | 2014-03-26 | 广东电网公司肇庆供电局 | Voltage regulating device of power distribution network |
| CN103683295B (en) * | 2013-11-26 | 2016-08-24 | 广东电网公司肇庆供电局 | Power distribution network regulator |
| CN105846439A (en) * | 2016-05-10 | 2016-08-10 | 北京泰豪电力科技有限公司 | Transformer economic operation adjusting method |
| CN107482625A (en) * | 2017-08-17 | 2017-12-15 | 国网山东省电力公司枣庄供电公司 | A kind of intelligent operation/cutting system based on distribution transformer |
| CN107994568A (en) * | 2017-11-24 | 2018-05-04 | 国网北京市电力公司 | Low pressure wiring system, low pressure mode of connection and device |
| CN107994568B (en) * | 2017-11-24 | 2021-12-10 | 国网北京市电力公司 | Low-voltage wiring system, low-voltage wiring method and low-voltage wiring device |
| CN112152205A (en) * | 2020-09-08 | 2020-12-29 | 南京德尔森电气有限公司 | Intelligent low-voltage automatic switching management unit and management method |
| CN112751367A (en) * | 2020-12-28 | 2021-05-04 | 国网山东省电力公司枣庄供电公司 | Transformer-based electrical load regulation and control system and use method thereof |
| CN113824113A (en) * | 2021-10-14 | 2021-12-21 | 安徽省建筑设计研究总院股份有限公司 | Load rate control circuit and control method for balancing transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101110 Termination date: 20110203 |