CN101741095A - Automatic switching device for economic operation of power transformer - Google Patents
Automatic switching device for economic operation of power transformer Download PDFInfo
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- CN101741095A CN101741095A CN200810177482A CN200810177482A CN101741095A CN 101741095 A CN101741095 A CN 101741095A CN 200810177482 A CN200810177482 A CN 200810177482A CN 200810177482 A CN200810177482 A CN 200810177482A CN 101741095 A CN101741095 A CN 101741095A
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Abstract
The invention provides an automatic switching device for the economic operation of a power transformer, comprising a current signal detection circuit, a current signal judgment processing circuit, a time-delay circuit, a transformer switch-in closing circuit and a transformer switch-off tripping circuit; wherein the current signal detection circuit is connected with the current signal judgment processing circuit; the current signal judgment processing circuit outputs a large fixed value termination point and a small fixed value termination point which are respectively connected with the transformer switch-in closing circuit and the transformer switch-off tripping circuit through the time-delay circuit; when the current detection circuit detects that a current value exceeds a set large fixed value, the closing circuit is started in a time-delay way, and a transformer is automatically switched in for operation; and when a small fixed value is detected, the tripping circuit is started in a time-delay way, and the transformer is automatically switched off for the operation. The automatic switching device can accurately automatically finish the switching in time according to a set economic operation way of the transformer, be used for the parallel operation of the transformer and the operation of a main transformer and a sub-transformer, reduce the complex and heavy switching operation and the misoperation of workers and the operation loss of a power grid and enhance the enterprise and society benefits.
Description
Technical field
The present invention relates to a kind of electric power system transformer economic operation automatic switching device, be applied to the various electric pressures of electric power system, two in the transformer and the above economical operation automatic switching arranged side by side of two circles or three circle windings.
Background technology
At present, two of the various electric pressures of electric power system and above power transformer require to have the condition of parallel running, the transformer of operation requires in parallel, the purpose of transformers connected in parallel operation: the one, improve power supply reliability, a transformer breaks down and can excise from electrical network when operation, and other transformers continue the operation power supply; The 2nd, can improve the transformer performance driving economy, can adjust the transformer platform number of input paired running to improve operational efficiency according to the load size; The 3rd, can reduce total reserve capacity, can divide and pull on new transformer along with the increase of power consumption.
At present the paired running transformer is thrown and is moved back operation and all need to operate according to the load concrete condition by the operation operator on duty, and just load is big removes transformer of operation throwing by the operator on duty, loads and hour moves back a transformer.10KV distribution transformer particularly adopts mother and sons' transformer, capacitance-adjustable transformer for loss-reducing and electricity-saving has.Operating time is long like this, and operator on duty's labour intensity is big, and there is unsafe misoperation factor, and the conversion volume operation of capacitance-adjustable transformer need have a power failure and carries out, according to this present situation, a kind of science, rational scheme by the way of economic operation automatic switching transformer of setting are proposed.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, thus provide a kind of design science, cost low, reduce labour intensity, improve security reliability, improve the transformer economic operation automatic switching device of power supply reliability.
To achieve these goals, the invention provides a kind of transformer economic operation automatic switching device, it has overcome, and present worker's labour intensity is big, dangerous, the operating time is long, can not in time adjust the loss problem of electrical network in service.
The invention provides a kind of automatic switching device for economic operation of power transformer, comprise that current signal detection circuit, current signal judgment processing circuit, delay circuit, transformer input combined floodgate circuit, transformer withdraw from the separating brake circuit.
Described current signal judgment processing circuit, output is two terminations, is respectively D, X, and described D, X two ends connect described delay circuit respectively, and the output that described D termination connects described delay circuit connects described transformer input combined floodgate circuit; The output that described X termination connects described delay circuit connects described transformer and withdraws from the separating brake circuit.
Described current signal detection circuit comprises a current transformer and a current transducer KA; Wherein said Current Transformer Secondary lateral coil has two ends, and a termination connects described current transducer KA coil one termination, and another termination of described current transducer KA coil connects ground connection behind another termination of described Current Transformer Secondary coil.
Described current signal judgment processing circuit comprises an A/D analog-digital converter circuit, calculates decision circuitry, executive component; Described A/D analog-digital converter circuit is transformed into digital quantity with the current signal of input by analog quantity, and output connects data computation judgment processing circuit, and calculating the output of judgment processing circuit has large and small two kinds, connects executive component K1, K2 respectively.
Described delay circuit comprises two time relay KT1, KT2, the make contact K11 of described relay K 1 and break contact K12, the make contact K21 of described relay K 2 and break contact K22;
Wherein, the make contact K11 one termination power a of described relay K 1, break contact K22 one end of the described relay K 2 of another termination of the make contact K11 of described relay K 1, one termination of the described time relay KT1 of another termination of the break contact K22 coil of described relay K 2, another termination of described time relay KT1 coil meets power supply N; The make contact K21 one termination power a of described relay K 2, break contact K12 one end of the described relay K 1 of another termination of the make contact K21 of described relay K 2, one termination of the described time relay KT2 of another termination of the break contact K12 coil of described relay K 1, another termination of described time relay KT2 coil meets power supply N.
Described transformer input combined floodgate circuit comprises that Transformer Winding neutral ground isolating switch closes, the separating brake circuit, the breaker closing circuit;
Wherein, described Transformer Winding neutral ground isolating switch combined floodgate circuit comprises make contact KT11, time relay KTG, the closing coil YC1 of time relay KT1; The make contact KT11 one termination power a of described time relay KT1, another termination of the make contact KT11 of described time relay KT1 connects an end of time relay KTG coil, another termination of described time relay KTG coil engages the termination of brake cable circle YC1, and another termination of described closing coil YC1 meets power supply N;
Described breaker closing circuit comprises make contact KTG1, time relay KTN, the closing contactor KM of time relay KTG; The make contact KTG1 one termination power L+ of described time relay KTG, one termination of the described time relay KTN of another termination of the make contact KTG1 of described time relay KTG coil, another termination of described time relay KTN coil is connected with a termination of described closing contactor KM coil, and another termination of described closing contactor KM coil meets power supply L-;
Described Transformer Winding neutral ground isolating switch separating brake circuit comprises make contact KTN1, the switching winding YT1 of time relay KTN; The make contact KTN1 one termination power a of described time relay KTN, another termination of the make contact KTN1 of described time relay KTN connects the end of switching winding YT1, another termination power N of described switching winding YT1.
Described transformer withdraws from the separating brake circuit, comprises high and low pressure side breaker open operation circuit;
Wherein, described step down side breaker open operation circuit comprises make contact KT21, time relay KTD, the breaking coil YT2 of time relay KT2; Make contact KT21 one termination of described time relay KT2 meets power supply L+, one termination of the described time relay KTD of another termination of the make contact KT21 of described time relay KT2 coil, another termination of time relay KTD coil connects the termination of breaking coil YT2, and another termination of described breaking coil YT2 meets power supply L-.
Described transformer withdraws from high-pressure side breaker open operation circuit, comprise time relay KTD make contact KTD1,, breaking coil YT3; Make contact KTD1 one termination of described time relay KTD meets power supply L+, the termination of the described breaking coil YT3 of another termination of the make contact KTD1 of described time relay KTD, and another termination of described breaking coil YT3 meets power supply L-.
The relative prior art of the present invention has outstanding substantive distinguishing features and obvious improvement, and this device has the following advantages specifically:
1. because this device has automatic detection arbitration functions, can promptly and accurately adjust the Transformer Economic operation, reduce the operation electric energy loss of electrical network effectively.Improve power supply reliability, increased enterprise and economic results in society.
2. because this device is to finish Transformer Economic operation throwing automatically to move back work, deducted operations staff's heavy grid switching operation, prior one is to have improved security reliability simultaneously, has reduced misoperation.
3. this device technique broad range of applicability is adjusted flexibly, may be used on two windings or the three-winding transformer of various electric pressures, and in the economical operation arranged side by side of many transformers.Particularly the 10KV distribution transformer adopts the more superior of mother and sons' transformer for loss-reducing and electricity-saving has.
4. this apparatus structure is simple, is skillfully constructed, science reasonable in design, and cost is low, and is easy to use.
Description of drawings
Fig. 1 is the functional-block diagram of invention
Fig. 2 A is current signal detection circuit figure one of the present invention
Fig. 2 B is current signal detection circuit figure two of the present invention
Fig. 3 is current signal judgment processing circuit figure of the present invention
Fig. 4 is delay circuit figure of the present invention
Fig. 5 is a Transformer Winding neutral ground isolating switch combined floodgate circuit diagram of the present invention
Fig. 6 is that transformer of the present invention drops into the breaker closing circuit diagram
Fig. 7 is a Transformer Winding neutral ground isolating switch separating brake circuit diagram of the present invention
Fig. 8 withdraws from low-voltage circuit breaker separating brake circuit diagram for transformer of the present invention
Fig. 9 withdraws from primary cut-out separating brake circuit diagram for transformer of the present invention
Embodiment
For making technical scheme of the present invention clearer, the specific embodiment of the present invention is done detailed explanation below in conjunction with accompanying drawing.
Figure 1 shows that transformer economic operation automatic switching device theory diagram, comprise that current signal detection circuit 1, current signal judgment processing circuit 2, delay circuit 3, transformer input combined floodgate circuit 4, transformer withdraw from separating brake circuit 5.
Detect signal by current signal detection circuit and input to current signal judgment processing circuit, signal judging circuit goes out two kinds of situations of sizes values according to input-signal judging, by being sent to the transformer input or withdrawing from the on/off switch circuit after the time-delay, finish automatic switching transformer task.
Fig. 2 A is depicted as current signal detection circuit, comprises a current transformer and a current transducer KA; Wherein said Current Transformer Secondary lateral coil has two ends, and a termination connects described current transducer KA coil one termination, and another termination of described current transducer KA coil connects ground connection behind another termination of described Current Transformer Secondary coil.
Current signal detection circuit passes to current transducer with the detected signal of current transformer, and current transducer changes dc current signal with ac current signal, inputs to current signal and calculates the judgment processing circuit.
Figure 3 shows that current signal judgment processing circuit diagram of the present invention, described current signal is handled decision circuitry and is comprised an A/D analog-digital converter circuit, calculates decision circuitry, executive component; Described A/D analog-digital converter circuit is transformed into digital quantity with the current signal of input by analog quantity, and output connects data computation judgment processing circuit, and calculating the output of judgment processing circuit has large and small two kinds, connects executive component K1, K2 respectively.
Figure 4 shows that delay circuit, comprise two time relay KT1, KT2, the make contact K11 of described relay K 1 and break contact K12, the make contact K21 of described relay K 2 and break contact K22;
Wherein, the make contact K11 one termination power a of described relay K 1, break contact K22 one end of the described relay K 2 of another termination of the make contact K11 of described relay K 1, one termination of the described time relay KT1 of another termination of the break contact K22 coil of described relay K 2, another termination of described time relay KT1 coil meets power supply N; The make contact K21 one termination power a of described relay K 2, break contact K12 one end of the described relay K 1 of another termination of the make contact K21 of described relay K 2, one termination of the described time relay KT2 of another termination of the break contact K12 coil of described relay K 1, another termination of described time relay KT2 coil meets power supply N.
When detecting decision circuitry and detect current value and reach the big current value of setting, relay K 1 action, the make contact closure, just action of time relay KT1 this moment, the breaker closing circuit that time-delay back starting transformer drops into is finished and is dropped into a transformer.When detecting decision circuitry and detect current value and reach the little current value of setting, relay K 2 make contact closed turn-on time of relay K T2, time-delay back starting transformer withdraws from trip circuit, finishes and withdraws from a transformer.Relay K 1, K2 break contact K12, K22 interlocking purpose are to improve the reliability of action.
Figure 5 shows that Transformer Winding neutral ground isolating switch combined floodgate circuit, comprise make contact KT11, time relay KTG, the closing coil YC1 of time relay KT1; The make contact KT11 one termination power a of described time relay KT1, another termination of the make contact KT11 of described time relay KT1 connects an end of time relay KTG coil, another termination of described time relay KTG coil engages the termination of brake cable circle YC1, and another termination of described closing coil YC1 meets power supply N;
After current signal detection circuit detects big electric current, by delayed startup Transformer Close circuit, earlier high-tension transformer high pressure winding neutral ground isolating switch is closed, prepare to drop into transformer.
Figure 6 shows that the breaker closing circuit, comprise make contact KTG1, time relay KTN, the closing contactor KM of time relay KTG; The make contact KTG1 one termination power L+ of described time relay KTG, one termination of the described time relay KTN of another termination of the make contact KTG1 of described time relay KTG coil, another termination of described time relay KTN coil is connected with a termination of described closing contactor KM coil, and another termination of described closing contactor KM coil meets power supply L-;
After transformer high-voltage winding neutral ground isolating switch closes a floodgate, delayed startup transformer high-voltage side breaker closing circuit, behind the breaker closing of high-pressure side, delayed startup step down side breaker closing circuit again, if three-winding transformer, delayed startup transformer medium voltage side breaker closing circuit is finished transformer and is devoted oneself to work again.
Figure 7 shows that Transformer Winding neutral ground isolating switch separating brake circuit, comprise make contact KTN1, the switching winding YT1 of time relay KTN; The make contact KTN1 one termination power a of described time relay KTN, another termination of the make contact KTN1 of described time relay KTN connects the end of switching winding YT1, another termination power N of described switching winding YT1.
When the transformer breaker operator that puts into operation finishes, according to power system operating mode, what have withdraws from Transformer Winding neutral ground isolating switch, and what have does not withdraw from, and that need withdraw from must send electricity last breaker closing of operation laggard line operate at transformer.
Because electrical network has superhigh pressure, high pressure, middle pressure, low pressure, transformer has three windings that two windings are arranged, the winding neutral point structure of high-tension transformer is a thin insulating, the operation sequence that drops into transformer is: after dropping into the neutral ground isolating switch earlier, drop into high-pressure side circuit breaker, low-pressure side circuit breaker, medium voltage side circuit breaker again, draw back neutral ground isolating switch (or not drawing back) at last according to power system operating mode.
Step down side breaker open operation circuit shown in Figure 8 comprises make contact KT21, time relay KTD, the switching winding YT2 of time relay KT2; Make contact KT21 one termination of described time relay KT2 meets power supply L+, one termination of the described time relay KTD of another termination of the make contact KT21 of described time relay KT2 coil, another termination of time relay KTD coil connects the termination of switching winding YT2, and another termination of described switching winding YT2 meets power supply L-.
After current detection circuit detected little electric current operating value, the breaker open operation circuit of the first starting transformer downside of delaying time disconnected transformer load.
Figure 9 shows that transformer of the present invention withdraws from primary cut-out separating brake circuit diagram, described transformer withdraws from high-pressure side breaker open operation circuit, comprise time relay KTD make contact KTD1,, breaking coil YT3; Make contact KTD1 one termination of described time relay KTD meets power supply L+, the termination of the described breaking coil YT3 of another termination of the make contact KTD1 of described time relay KTD, and another termination of described breaking coil YT3 meets power supply L-.
After current detection circuit detected little electric current operating value, the breaker open operation circuit of the first starting transformer downside of delaying time disconnected transformer load.The breaker open operation circuit of the high side of delayed startup transformer disconnects transformer and power supply again.
Fig. 2 B is depicted as current signal detection circuit figure two of the present invention, and described current signal detection circuit, current signal decision circuitry comprise a current transformer and two current relay KA1, KA2; Wherein said Current Transformer Secondary lateral coil has two ends, one termination connects described current relay KA1 coil one termination, another termination of described current relay KA1 coil connects described current relay KA2 coil one termination, and another termination of described current relay KA2 coil connects ground connection behind another termination of described Current Transformer Secondary coil.
When current transformer detects current signal, two current relay KA1, KA2 judge the size of current signal, surpass the big definite value of setting when detecting current signal, relay K A1 action, and a transformer is dropped into by the combined floodgate circuit in the time-delay back; Be lower than when setting little value when detecting current signal value, relay K A2 action, time-delay is then withdrawed from a transformer by the separating brake circuit.
Explanation is at last: above case only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to preferred embodiment the present invention is described in detail, those of ordinary skill in the field are to be understood that.Still can make amendment or the part technical characterictic is replaced on an equal basis the specific embodiment of the present invention, and not break away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the scope of the technical scheme that the present invention asks for protection.
Claims (6)
1. a transformer economic operation automatic switching device is characterized in that: comprise that current signal detection circuit, current signal judgment processing circuit, delay circuit, transformer input combined floodgate circuit, transformer withdraw from the separating brake circuit;
Described current signal judgment processing circuit, output is two terminations, is respectively D, X, and described D, X two ends connect described delay circuit respectively, and the output that described D termination connects described delay circuit connects described transformer input combined floodgate circuit; The output that described X termination connects described delay circuit connects described transformer and withdraws from the separating brake circuit.
2. transformer economic operation automatic switching device according to claim 1 is characterized in that: described current signal detection circuit comprises a current transformer and a current transducer KA; Wherein said Current Transformer Secondary lateral coil has two ends, and a termination connects described current transducer KA coil one termination, and another termination of described current transducer KA coil connects ground connection behind another termination of described Current Transformer Secondary coil.
3. transformer economic operation automatic switching device according to claim 1 is characterized in that: described current signal is handled decision circuitry and is comprised an A/D analog-digital converter circuit, calculates decision circuitry, executive component; Described A/D analog-digital converter circuit is transformed into digital quantity with the current signal of input by analog quantity, and output connects the calculating judgment processing circuit of current signal, and calculating the output of judgment processing circuit has large and small two kinds of results, connects executive component K1, K2 respectively.
4. transformer economic operation automatic switching device according to claim 1, it is characterized in that: described delay circuit, comprise two time relay KT1, KT2, the make contact K11 of described relay K 1 and break contact K12, the make contact K21 of described relay K 2 and break contact K22;
Wherein, the make contact K11 one termination power a of described relay K 1, break contact K22 one end of the described relay K 2 of another termination of the make contact K11 of described relay K 1, one termination of the described time relay KT1 of another termination of the break contact K22 coil of described relay K 2, another termination of described time relay KT1 coil meets power supply N; The make contact K21 one termination power a of described relay K 2, break contact K12 one end of the described relay K 1 of another termination of the make contact K21 of described relay K 2, one termination of the described time relay KT2 of another termination of the break contact K12 coil of described relay K 1, another termination of described time relay KT2 coil meets power supply N.
5. transformer economic operation automatic switching device according to claim 1 is characterized in that: described transformer input combined floodgate circuit comprises that Transformer Winding neutral ground isolating switch closes, the separating brake circuit, the breaker closing circuit;
Wherein, described Transformer Winding neutral ground isolating switch combined floodgate circuit comprises make contact KT11, time relay KTG, the closing coil YC1 of time relay KT1; The make contact KT11 one termination power a of described time relay KT1, another termination of the make contact KT11 of described time relay KT1 connects an end of time relay KTG coil, another termination of described time relay KTG coil engages the termination of brake cable circle YC1, and another termination of described closing coil YC1 meets power supply N;
Described breaker closing circuit comprises make contact KTG1, time relay KTN, the closing contactor KM of time relay KTG; The make contact KTG1 one termination power L+ of described time relay KTG, one termination of the described time relay KTN of another termination of the make contact KTG1 of described time relay KTG coil, another termination of described time relay KTN coil is connected with a termination of described closing contactor KM coil, and another termination of described closing contactor KM coil meets power supply L-;
Described Transformer Winding neutral ground isolating switch separating brake circuit comprises make contact KTN1, the breaking coil YT1 of time relay KTN; The make contact KTN1 one termination power a of described time relay KTN, another termination of the make contact KTN1 of described time relay KTN connects the end of breaking coil YT1, another termination power N of described breaking coil YT1.
6. transformer economic operation automatic switching device according to claim 1 is characterized in that: described transformer withdraws from the separating brake circuit, comprises high and low pressure side breaker open operation circuit;
Wherein, described step down side breaker open operation circuit comprises make contact KT21, time relay KTD, the breaking coil YT2 of time relay KT2; Make contact KT21 one termination of described time relay KT2 meets power supply L+, one termination of the described time relay KTD of another termination of the make contact KT21 of described time relay KT2 coil, another termination of time relay KTD coil connects the termination of breaking coil YT2, and another termination of described breaking coil YT2 meets power supply L-.
Described transformer withdraws from high-pressure side breaker open operation circuit, comprise time relay KTD make contact KTD1,, breaking coil YT3; Make contact KTD1 one termination of described time relay KTD meets power supply L+, the termination of the described breaking coil YT3 of another termination of the make contact KTD1 of described time relay KTD, and another termination of described breaking coil YT3 meets power supply L-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810177482A CN101741095A (en) | 2008-11-26 | 2008-11-26 | Automatic switching device for economic operation of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810177482A CN101741095A (en) | 2008-11-26 | 2008-11-26 | Automatic switching device for economic operation of power transformer |
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| CN101741095A true CN101741095A (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810177482A Pending CN101741095A (en) | 2008-11-26 | 2008-11-26 | Automatic switching device for economic operation of power transformer |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005781A (en) * | 2010-11-29 | 2011-04-06 | 河南省电力公司安阳供电公司 | 10kV no-load automatic switching device for agricultural displacement transformer |
| CN102290860A (en) * | 2010-06-19 | 2011-12-21 | 陈家斌 | Low voltage phase line earthing remote alarm for distribution transformer |
| CN102315813A (en) * | 2010-10-27 | 2012-01-11 | 重庆市电力公司 | Intelligent control system of economic operation of transformer |
| CN102611113A (en) * | 2012-04-25 | 2012-07-25 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligently controlling parallel operation of 110kV three-winding transformers |
| CN102624032A (en) * | 2012-04-25 | 2012-08-01 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligently controlling parallel running of two 110kV winding transformers |
| CN102646994A (en) * | 2012-04-25 | 2012-08-22 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligent control of parallel operation of 220kV three-winding transformers |
| CN106160210A (en) * | 2015-03-30 | 2016-11-23 | 李爱群 | Agricultural drainage and irrigation distribution transformer intelligent management system |
| CN106532718A (en) * | 2016-11-25 | 2017-03-22 | 河南众联云科工程技术有限公司 | Automatic switching apparatus for transformer |
| CN106549386A (en) * | 2016-11-25 | 2017-03-29 | 河南众联云科工程技术有限公司 | Transformator switching monitoring system |
| CN110336278A (en) * | 2019-07-11 | 2019-10-15 | 中铁隧道集团三处有限公司 | Parallel operation of transformers method based on electric current relay |
-
2008
- 2008-11-26 CN CN200810177482A patent/CN101741095A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290860A (en) * | 2010-06-19 | 2011-12-21 | 陈家斌 | Low voltage phase line earthing remote alarm for distribution transformer |
| CN102315813B (en) * | 2010-10-27 | 2013-07-17 | 重庆市电力公司 | Intelligent control system of economic operation of transformer |
| CN102315813A (en) * | 2010-10-27 | 2012-01-11 | 重庆市电力公司 | Intelligent control system of economic operation of transformer |
| CN102005781A (en) * | 2010-11-29 | 2011-04-06 | 河南省电力公司安阳供电公司 | 10kV no-load automatic switching device for agricultural displacement transformer |
| CN102611113A (en) * | 2012-04-25 | 2012-07-25 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligently controlling parallel operation of 110kV three-winding transformers |
| CN102646994A (en) * | 2012-04-25 | 2012-08-22 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligent control of parallel operation of 220kV three-winding transformers |
| CN102624032A (en) * | 2012-04-25 | 2012-08-01 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligently controlling parallel running of two 110kV winding transformers |
| CN102646994B (en) * | 2012-04-25 | 2014-05-21 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligent control of parallel operation of 220kV three-winding transformers |
| CN102624032B (en) * | 2012-04-25 | 2014-06-25 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligently controlling parallel running of two 110kV winding transformers |
| CN102611113B (en) * | 2012-04-25 | 2014-07-09 | 河南省电力公司驻马店供电公司 | Automatic switching device for intelligently controlling parallel operation of 110kV three-winding transformers |
| CN106160210A (en) * | 2015-03-30 | 2016-11-23 | 李爱群 | Agricultural drainage and irrigation distribution transformer intelligent management system |
| CN106532718A (en) * | 2016-11-25 | 2017-03-22 | 河南众联云科工程技术有限公司 | Automatic switching apparatus for transformer |
| CN106549386A (en) * | 2016-11-25 | 2017-03-29 | 河南众联云科工程技术有限公司 | Transformator switching monitoring system |
| CN110336278A (en) * | 2019-07-11 | 2019-10-15 | 中铁隧道集团三处有限公司 | Parallel operation of transformers method based on electric current relay |
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Open date: 20100616 |