CN204144913U - Installation of Open-circuit Protection for Current Transformers in electric power system - Google Patents
Installation of Open-circuit Protection for Current Transformers in electric power system Download PDFInfo
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- CN204144913U CN204144913U CN201420680271.1U CN201420680271U CN204144913U CN 204144913 U CN204144913 U CN 204144913U CN 201420680271 U CN201420680271 U CN 201420680271U CN 204144913 U CN204144913 U CN 204144913U
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- 238000009434 installation Methods 0.000 title claims abstract description 16
- 238000012545 processing Methods 0.000 claims description 45
- 238000001514 detection method Methods 0.000 claims description 24
- 230000009471 action Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 230000006378 damage Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
Installation of Open-circuit Protection for Current Transformers in a kind of electric power system that the utility model provides, at least comprise the detecting unit for detecting current transformer state parameter, be connected with the output of described detecting unit for accepting state parameter and the control unit exporting control command and the protection performance element be connected with the instruction output end of control unit, described protection performance element is arranged at the secondary side of current transformer and controls the shorted on both ends of the secondary side of current transformer; Installation of Open-circuit Protection for Current Transformers in electric power system of the present utility model; can not only occur that the state of saltus step makes protection act immediately at the electric current of secondary side and voltage; and reset in time when the secondary side current that can cause at non-open circuit and voltage jump, ensure that power supply is continual and steady.
Description
Technical field
The utility model relates to field of electrical equipment, particularly relates to the Installation of Open-circuit Protection for Current Transformers in a kind of electric power system.
Background technology
Current transformer is one of equipment commonly used in supply of electric power, plays vital effect in power supply process, and its main application is mainly used for protection and measures.Current transformer in use makes to forbid secondary side to be opened a way, there is following harm in secondary side open circuit: the secondary side open circuit of current transformer, so the electric current of the primary side of current transformer is all for excitation, make the iron core of current transformer seriously saturated, the magnetic flux of alternation induces high voltage on the coil of secondary side, its peak value can up to several kilovolts volt even up to ten thousand, therefore serious harm will be brought, such as: contact accident, current transformer burns out, differential protection or zero-sequence current protection are because of unsymmetrical current malfunction etc., therefore, need monitor the secondary side open circuit of current transformer and effectively protect.
But, in prior art, the protection of opening a way for the secondary side of current transformer is generally manual type, staff is had to be checked by detecting instrument, open circuit is judged whether according to the situation showed in the running of current transformer, such as: the size of current detecting secondary side, judge whether secondary side voltage has violent saltus step, observe current transformer and whether have discharge spark or appearance etc. of smoldering, protection act (generally Current Transformer Secondary side short circuit) is performed again after this mode detects, greatly delay the processing time, thus cause current transformer to damage in a large number or current transformer load damage, on the other hand, when unexpected factor appears in current transformer primary side, such as thunder-strike current, same meeting induces high voltage and big current at secondary side, although of short duration, as processed not in time, still load equipment can be caused to damage, and easily cause existing proterctive equipment malfunction, can't reset immediately after existing proterctive equipment action needs people to participate in, thus causes power supply trouble.
Therefore, need the proterctive equipment of the secondary side proposing a kind of new current transformer, can not only occur that the state of saltus step makes protection act immediately at the electric current of secondary side and voltage, and reset in time when the secondary side current that can cause at non-open circuit and voltage jump, ensure that power supply is continual and steady; Whether but also can to open a way and operating state is monitored by the round-the-clock secondary side to current transformer, and whole process is without the need to manual intervention, saves human cost and resource.
Utility model content
In view of this, the purpose of this utility model is to provide the Installation of Open-circuit Protection for Current Transformers in a kind of electric power system, can not only occur that the state of saltus step makes protection act immediately at the electric current of secondary side and voltage, and reset in time when the secondary side current that can cause at non-open circuit and voltage jump, ensure that power supply is continual and steady; Whether but also can to open a way and operating state is monitored by the round-the-clock secondary side to current transformer, and whole process is without the need to manual intervention, saves human cost and resource.
Installation of Open-circuit Protection for Current Transformers in a kind of electric power system that the utility model provides, at least comprise the detecting unit for detecting current transformer state parameter, be connected with the output of described detecting unit for accepting state parameter and the control unit exporting control command and the protection performance element be connected with the instruction output end of control unit, described protection performance element is arranged at the secondary side of current transformer and controls the shorted on both ends of the secondary side of current transformer;
Described detecting unit at least comprises voltage detecting circuit and two groups of current detection circuits, and wherein one group of current detection circuit is connected to the primary side of current transformer, and another group current detection circuit is connected to the secondary side of current transformer;
Described protection performance element at least comprises the relay being connected to two ends, Current Transformer Secondary side, the relay drive circuit for control relay action be connected with relay, protects indicating circuit and reset trigger switch; described protection indicating circuit is connected with control unit; described relay drive circuit is connected with described control unit, and described reset trigger switch is connected with described control unit.
Further, described control unit comprises the amplifying circuit be connected with the output of described detecting unit, the filter circuit be connected with the output of described amplifying circuit, the signal acquisition circuit be connected with described filter circuit output, the primary current comparison circuit be connected with the output of described signal acquisition circuit, the secondary current comparison circuit be connected with the output of described signal acquisition circuit and the central processing circuit be connected with the output of described primary current comparison circuit and secondary current comparison circuit, the input of described central processing circuit is also connected with the output of described signal acquisition circuit.
Further, described protection indicating member comprises at least two indicator lights and the switching circuit for the supply access that controls indicator light, and the command input end of described switching circuit is connected with described central processing circuit.
Further, described detecting unit also comprises the vibrating sensor being arranged at current transformer, at least two temperature sensors, at least one camera and image processing circuits; Described vibrating sensor is all connected with the input of described amplifying circuit with the output of sets of temperature sensors, the output of described image processing circuit is connected with the input of described central processing circuit, one of them temperature sensor is arranged at current transformer, and another temperature sensor is arranged in environment residing for current transformer.
Further, described protection system also comprises control centre, and described control centre and described central processing circuit are connected by wireless communication module and carry out data interaction.
Further, described control unit also comprises coding circuit, and described coding circuit is connected with central processing circuit.
The beneficial effects of the utility model: the Installation of Open-circuit Protection for Current Transformers in electric power system of the present utility model, can not only occur that the state of saltus step makes protection act immediately at the electric current of secondary side and voltage, and reset in time when the secondary side current that can cause at non-open circuit and voltage jump, ensure that power supply is continual and steady; Whether but also can to open a way and operating state is monitored by the round-the-clock secondary side to current transformer, and whole process is without the need to manual intervention, saves human cost and resource.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further described:
Fig. 1 is theory diagram of the present utility model.
Embodiment
Fig. 1 is theory diagram of the present utility model, as shown in the figure, Installation of Open-circuit Protection for Current Transformers in a kind of electric power system that the utility model provides, at least comprise the detecting unit for detecting current transformer state parameter, be connected with the output of described detecting unit for accepting state parameter and the control unit exporting control command and the protection performance element be connected with the instruction output end of control unit, described protection performance element is arranged at the secondary side of current transformer and controls the shorted on both ends of the secondary side of current transformer;
Described detecting unit at least comprises voltage detecting circuit and two groups of current detection circuits, wherein one group of current detection circuit is connected to the primary side of current transformer, another group current detection circuit is connected to the secondary side of current transformer, each group current detection circuit only arranges a circuit, as need be repeatedly corrected, often group can arrange two and two or more, but cost is higher, in Fig. 1, current detection circuit A represents the current detection circuit being arranged at current transformer primary side, current detection circuit B represents the current detection circuit being arranged at Current Transformer Secondary side,
Described protection performance element at least comprises the relay being connected to two ends, Current Transformer Secondary side, the relay drive circuit for control relay action be connected with relay, protects indicating circuit and reset trigger switch, described protection indicating circuit is connected with control unit, described relay drive circuit is connected with described control unit, and described reset trigger switch is connected with described control unit;
Wherein, control unit and protection performance element are powered by independently power supply, and described relay adopts electromagnetic relay, and its drive circuit can adopt existing circuit realiration; Installation of Open-circuit Protection for Current Transformers in electric power system of the present utility model, can not only occur that the state of saltus step makes protection act immediately at the electric current of secondary side and voltage, and reset in time when the secondary side current that can cause at non-open circuit and voltage jump, ensure that power supply is continual and steady; Whether but also can to open a way and operating state is monitored by the round-the-clock secondary side to current transformer, and whole process is without the need to manual intervention, saves human cost and resource.
In the present embodiment, described control unit comprises the amplifying circuit be connected with the output of described detecting unit, the filter circuit be connected with the output of described amplifying circuit, the signal acquisition circuit be connected with described filter circuit output, the primary current comparison circuit be connected with the output of described signal acquisition circuit, the secondary current comparison circuit be connected with the output of described signal acquisition circuit and the central processing circuit be connected with the output of described primary current comparison circuit and secondary current comparison circuit, the input of described central processing circuit is also connected with the output of described signal acquisition circuit,
Wherein, central processing circuit can adopt existing single-chip microcomputer and carry existing software, such as AVR single chip, 89C51 single-chip microcomputer etc.;
Primary current comparison circuit and secondary current comparison circuit all adopt existing comparison circuit, the comparison circuits such as such as LM339;
Described amplifying circuit, filter circuit and signal acquisition circuit all adopt existing multi-channel circuit, and signal acquisition circuit has signal sampling and analog-to-digital function.
In the present embodiment, described protection indicating member comprises at least two indicator lights and the switching circuit for the supply access that controls indicator light, and the command input end of described switching circuit is connected with described central processing circuit, one of them indicator light is used to indicate Current Transformer Secondary side and has high voltage and big current, can judge that the high voltage of secondary side and big current cause as other inducements, such as thunder-strike current by the knowledge of this lamp, there is open fault in the secondary side that another indicator light is used to indicate current transformer, and is in short circuit protection, and reset after needing staff to fix a breakdown, namely this indicator light is in OFF state, certainly, indicator light can also arrange more, and the color of each indicator light is different, the primary side of such as current transformer or the electric current of secondary side all normal, and the voltage of secondary side is also normal, but the binding post laying dust of current transformer, when there is spark in the violent electric discharge that the phenomenons such as icing cause, can be indicated by other indicator lights, wherein, indicator light adopts independent Power supply, other elements, such as central processing circuit, make the voltage outputting to central processing circuit equal with its rated voltage after needing to carry out the process such as transformation to independent power supply.
In the present embodiment, described detecting unit also comprises the vibrating sensor being arranged at current transformer, at least two temperature sensors, at least one camera and image processing circuits, described vibrating sensor is all connected with the input of described amplifying circuit with the output of sets of temperature sensors, the output of described image processing circuit is connected with the input of described central processing circuit, one of them temperature sensor is arranged at current transformer, represent with temperature sensor A in FIG, another temperature sensor is arranged in environment residing for current transformer, represent with temperature sensor B, pass through vibrating sensor, the effect of temperature sensor and camera, round-the-clock monitoring can be carried out to the running status of current transformer, the work of other factors to current transformer is avoided to impact, what is more important, can according to above-mentioned each transducer and IMAQ and current detecting and voltage detecting acting in conjunction, whether the secondary side of current transformer is opened a way and judges accurately, this is due under the open-circuit condition of Current Transformer Secondary side or under secondary side wiring loosens situation, the temperature of current transformer can raise, abnormal vibration and there will be the situations such as electric spark, whether can open a way to secondary side according to the detection of these states and judge accurately, to guarantee the utility model and other equipment precision maneuver, there will not be nonaction.
In the present embodiment, described protection system also comprises control centre, described control centre and described central processing circuit are connected by wireless communication module and carry out data interaction, when open loop state appears in secondary side, the state information of current transformer is needed to be sent to control centre, and be beneficial to control centre and make correct countermeasure, and feed back to central processing unit and indicate staff to carry out fault and discharge process, wherein wireless communication module can adopt ethernet module or mobile data transfer module, mobile data transfer module is as 3G module or 4G module, the real-time of data can be ensured, and reduce line cost.
In the present embodiment, described control unit also comprises coding circuit, described coding circuit is connected with central processing circuit, by the effect of coding circuit, the current transformer of clear and definite specifically which transformer station of control centre and which converting equipment concrete can be made to break down, so that control centre makes maintenance instructions accurately, discharge fault in the fastest mode.
In the present embodiment, described control unit also comprises the display, output interface and the alarm that are all connected with central processing circuit, staff's observed data can be made easily, and be convenient to central processing circuit and be connected with purchased equipment, alarm can notify that staff reaches the spot rapidly, plays indicative function.
Operation principle of the present utility model:
When in all normal situation of signal that current detection circuit and the voltage detecting circuit of the secondary side of current transformer export, central processing circuit does not do any action, but important process circuit needs with reference to other signals, such as vibration signal, temperature signal and picture signal, if vibration signal, temperature signal and picture signal are abnormal, and (wherein abnormal to comprise binding post laying dust too much for picture signal, there is electric spark in icing or the binding post of Outdoor Current Transformer), then central processing circuit output alarm signal is to alarm, notify that staff safeguards, central processing circuit exports Monitoring Data to control centre, but be also out of order and report instruction (this instruction refers to that secondary side is opened a way),
There is saltus step in the signal exported when current detection circuit and the voltage detecting circuit of the secondary side of current transformer, and there is current value saltus step equally in the current detection circuit of the current detection circuit of the primary side of current transformer, and the current value that the current detection circuit of the current detection circuit of primary side and secondary side exports is proportional, so then the secondary side of provable current transformer is not in open-circuit condition, but the saltus step that other factors of primary side cause, such as thunder-strike current, central processing circuit exports control command and makes the action of protection performance element, make the secondary side short circuit of current transformer, and central processing circuit exports corresponding indicator light and lights, thus the load of secondary side and current transformer are protected, and central processing circuit is to control centre's feedback monitoring data, but do not do return instruction (this instruction refers to that secondary side is opened a way) of being out of order, when central processing circuit detects that the current value that the current detection circuit of primary side exports is returned to normal value (this normal value is range of normal value, be stored in primary current comparison circuit), and the current value that the current detection circuit of secondary side exports is returned to normal value, and (this normal value is stored in secondary current comparison circuit, be a value range), then central processing circuit exports control command, relay is disconnected, current transformer returns to normal operating conditions, and corresponding indicator light extinguishes, if the current signal that primary side current instrument transformer and secondary side current instrument transformer export continues big current, corresponding indicator light is bright, and central processing circuit exports Fault Control order, and output alarm signal, notify that staff processes in time, and report fault to control centre (this fault report instruction be do not open a way in Current Transformer Secondary side, but the input fault of primary side).
The current value exported when the current detection circuit of the primary side of current transformer is normal, but secondary side current testing circuit exports no signal current, and the voltage that voltage detecting circuit exports obviously increases, central processing circuit exports control command immediately, the action of Control protection performance element, thus make the secondary side short circuit of current transformer, if be now arranged at the temperature sensor of current transformer, the output signal of vibrating sensor is all in abnormality and this abnormality continues, then above-mentioned each monitor signal is transferred to control centre by central processing circuit, the indicator of request failture evacuation, and central processing circuit locking is the Control protection performance element in running order secondary survey short circuit making current transformer always also, only have when after failture evacuation, staff passes through reset trigger switch to central processing circuit output order, central processing circuit unlocks and Control protection performance element disconnects thus makes current transformer return to normal operating conditions.
What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.
Claims (6)
1. the Installation of Open-circuit Protection for Current Transformers in an electric power system, it is characterized in that: at least comprise the detecting unit for detecting current transformer state parameter, be connected with the output of described detecting unit for accepting state parameter and the control unit exporting control command and the protection performance element be connected with the instruction output end of control unit, described protection performance element is arranged at the secondary side of current transformer and controls the shorted on both ends of the secondary side of current transformer;
Described detecting unit at least comprises voltage detecting circuit and two groups of current detection circuits, and wherein one group of current detection circuit is connected to the primary side of current transformer, and another group current detection circuit is connected to the secondary side of current transformer;
Described protection performance element at least comprises the relay being connected to two ends, Current Transformer Secondary side, the relay drive circuit for control relay action be connected with relay, protects indicating circuit and reset trigger switch; described protection indicating circuit is connected with control unit; described relay drive circuit is connected with described control unit, and described reset trigger switch is connected with described control unit.
2. the Installation of Open-circuit Protection for Current Transformers according to claim 1 in electric power system, it is characterized in that: described control unit comprises the amplifying circuit be connected with the output of described detecting unit, the filter circuit be connected with the output of described amplifying circuit, the signal acquisition circuit be connected with described filter circuit output, the primary current comparison circuit be connected with the output of described signal acquisition circuit, the secondary current comparison circuit be connected with the output of described signal acquisition circuit and the central processing circuit be connected with the output of described primary current comparison circuit and secondary current comparison circuit, the input of described central processing circuit is also connected with the output of described signal acquisition circuit.
3. the Installation of Open-circuit Protection for Current Transformers according to claim 2 in electric power system; it is characterized in that: described protection indicating member comprises at least two indicator lights and the switching circuit for the supply access that controls indicator light, and the command input end of described switching circuit is connected with described central processing circuit.
4. the Installation of Open-circuit Protection for Current Transformers according to claim 3 in electric power system, is characterized in that: described detecting unit also comprises the vibrating sensor being arranged at current transformer, at least two temperature sensors, at least one camera and image processing circuits; Described vibrating sensor is all connected with the input of described amplifying circuit with the output of sets of temperature sensors, the output of described image processing circuit is connected with the input of described central processing circuit, one of them temperature sensor is arranged at current transformer, and another temperature sensor is arranged in environment residing for current transformer.
5. the Installation of Open-circuit Protection for Current Transformers according to claim 4 in electric power system, it is characterized in that: described protection system also comprises control centre, described control centre and described central processing circuit are connected by wireless communication module and carry out data interaction.
6. the Installation of Open-circuit Protection for Current Transformers according to claim 5 in electric power system, it is characterized in that: described control unit also comprises coding circuit, described coding circuit is connected with central processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420680271.1U CN204144913U (en) | 2014-11-11 | 2014-11-11 | Installation of Open-circuit Protection for Current Transformers in electric power system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420680271.1U CN204144913U (en) | 2014-11-11 | 2014-11-11 | Installation of Open-circuit Protection for Current Transformers in electric power system |
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| CN204144913U true CN204144913U (en) | 2015-02-04 |
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| CN201420680271.1U Expired - Fee Related CN204144913U (en) | 2014-11-11 | 2014-11-11 | Installation of Open-circuit Protection for Current Transformers in electric power system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332951A (en) * | 2014-11-11 | 2015-02-04 | 国家电网公司 | Protection system for secondary-side open circuit of current transformer |
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2014
- 2014-11-11 CN CN201420680271.1U patent/CN204144913U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332951A (en) * | 2014-11-11 | 2015-02-04 | 国家电网公司 | Protection system for secondary-side open circuit of current transformer |
| CN104332951B (en) * | 2014-11-11 | 2018-04-03 | 国家电网公司 | Current Transformer Secondary side open-circuit-protection system |
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| 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: 20150204 Termination date: 20151111 |
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| EXPY | Termination of patent right or utility model |