CN109274070A - 10 kilovoltage mutual inductors of one kind protection system and guard method - Google Patents
10 kilovoltage mutual inductors of one kind protection system and guard method Download PDFInfo
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- CN109274070A CN109274070A CN201811065006.1A CN201811065006A CN109274070A CN 109274070 A CN109274070 A CN 109274070A CN 201811065006 A CN201811065006 A CN 201811065006A CN 109274070 A CN109274070 A CN 109274070A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/05—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for capacitive voltage transformers, e.g. against resonant conditions
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Abstract
It include: circuit breaker cart, arrester handcart, arrester, three high-tension current inductors, four low-voltage current mutual inductors and control module this application discloses a kind of 10 kilovoltage mutual inductors protection system and guard method, the protection system.Fuse handcart in the prior art is replaced by circuit breaker cart, can be quick break when PT breaks down, to start the protection to PT in time, is conducive to the reliability and safety that improve power grid.This method comprises: the electric parameter and temperature information of real-time collection voltages mutual inductor；According to the electric parameter and temperature information, the current operating status of voltage transformer is judged using neural network algorithm；According to the current operating status of voltage transformer, voltage transformer is protected.By the guard method, can quickly targetedly various failures be prevented, alarmed and protective separation, to realize the various protections to voltage transformer.
Description
Technical field
This application involves technical field of electric control, more particularly to a kind of 10 kilovoltage mutual inductors protection system and guarantor
Maintaining method.
Background technique
In the system with non effectively earth ed neutral of 10kV, due to transformer, PT (Potential transformer, electricity
Press mutual inductor) and the equipment iron-core inductance such as arc suppression coil magnetic circuit saturation, excitation generates the iron of lasting higher magnitude
Magnetic resonance overvoltage.This resonance overvoltage frequency is often far below rated frequency, and iron core can be made to be in height saturation state,
The form of expression may be phase-to-ground voltage increase, exciting current is excessive or cause insulation flashover, arrester to burst with frequency wobbles,
High level zero sequence voltage component generates, Xuhanting oral solution phenomenon occurs and the instruction of incorrect ground connection.It is also possible to induce protection when serious
Malfunctioning or occurring overcurrent in voltage transformer causes PT to be burned.Especially in the problematic situation of product quality, such as
Insulation, core-lamination stack or when unqualified technique for coiling, phenomena such as will lead to PT internal short-circuit, electric discharge and heavy overload, thus
It causes PT internal temperature sharply to increase, even generate bulk gas, cannot handle in time, continue and will lead to PT explosion.
Therefore, 10 kilovoltage mutual inductors are protected, is a major issue.
Currently, generally including three kinds to the guard method of 10kV voltage transformer: the first is to 10kV PT cabinet using molten
Disconnected device is protected.Second is to match suitable arrester device to electric substation, route, inhibits Lightning Over-voltage.Such as
Valve-type arrester is installed on inlet wire, is substantially all installing valve arrester on each group of main bus-bar and sectionalized busbar of electric substation,
For protecting transformer and electrical equipment.The third be install primary and secondary arc-extinguishing resonance-extinguishing device additional on PT cabinet, such as: damping
Resistance, for eliminating the second harmonic of PT cabinet generation.
However, when first method PT included fuse tube has a phase to burn, PT outlet is partly connect in three kinds of current methods
The disconnected phase voltage superposition of ground terminal (Y type), is born by remaining two-phase, bears 1.732 times that voltage is original, be easy to cause voltage mutual
Sensor explosion.The primary element of valve-type arrester is spark gap and nonlinear resistance, these primary elements in second method
It is limited to the protective effect of PT, stronger protective effect can not be played to PT.The third method also pays no attention to the protective effect of PT
Think.Therefore, using current PT protective device, the protection to PT can not be started in time, lead to the reliability and peace of electric system
Full property is not high enough.
Summary of the invention
It is in the prior art to solve this application provides a kind of 10 kilovoltage mutual inductors protection system and guard method
The less reliable problem of protection of the protective device to voltage transformer.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution:
A kind of 10 kilovoltage mutual inductors protection system, the protection system are set at secondary connection cabinet door, and embedding
Enter formula to be installed in PT cabinet, the protection system includes: that circuit breaker cart, arrester handcart, arrester, three high-tension currents are mutual
Sensor, four low-voltage current mutual inductors and control module；
One end of three high-tension current inductors is connect with the voltage transformer, three high-tension current mutual inductances
The other end of device is connect with circuit breaker cart, one end ground connection of the arrester, the other end and arrester hand of the arrester
Vehicle connection, the circuit breaker cart and arrester handcart also connect with power supply buses respectively, and the circuit breaker cart and takes shelter from the thunder
Device handcart is connected in parallel, and the voltage transformer is integrated in by a harmonic elimination resistance eutral grounding, four low-voltage current mutual inductors
In control module, temp probe is additionally provided on the voltage transformer；
The input terminal of the control module respectively with three high-tension current inductors, four low-voltage current mutual inductors and electricity
Mutual inductor connection is pressed, the output end of the control module is connect with circuit breaker cart, the electricity for real-time collection voltages mutual inductor
Gas parameter and temperature information, and fault trip is carried out according to the electric parameter and temperature information triggering circuit breaker cart, it is described
Electric parameter includes: primary current, primary voltage, open delta voltage, secondary current and neutral point current.
Optionally, the output end of the control module is also communicated to connect with substation's background system.
Optionally, the control module includes CPU, relay unit, opens into unit, temperature sensor unit, exchange list
Member and power supply；
The relay unit, for the judging result according to CPU, output contact signal, the division for controlling breaker is dynamic
Make；
It is described to open into unit, for acquiring position and the protection system of the position of the switch, circuit breaker cart and arrester handcart
The location information of system；
The temperature sensor unit, for by the temperature information of temp probe voltage transformer collected be transmitted to after
Electric appliance unit；
The alternating current unit, for acquiring current signal, four low-voltage current mutual inductors of three high-tension current inductors
Current signal and voltage transformer voltage signal, and current signal collected and voltage signal are converted into 0-3.3V
Analog signals；
The CPU carries out data acquisition into unit for controlling to open, and is believed by analog quantity of the AD converter to alternating current unit
Number calculation process is carried out, and judges whether the electric parameter of voltage transformer and temperature information are exceeded.
Optionally, further include human-computer interaction module in the protection system, include display in the human-computer interaction module
And keyboard, for voltage transformer electric parameter and temperature information show, and for obtaining control instruction.
A kind of 10 kilovoltage mutual inductor guard methods, the guard method include:
The electric parameter and temperature information of real-time collection voltages mutual inductor, the electric parameter includes: primary current, primary
Voltage, open delta voltage, secondary current and neutral point current；
According to the electric parameter and temperature information, the current operation of voltage transformer is judged using neural network algorithm
State；
According to the current operating status of voltage transformer, voltage transformer is protected.
Optionally, described according to the electric parameter and temperature information, mutual induction of voltage is judged using neural network algorithm
The current operating status of device, specifically:
According to the electric parameter and temperature information, the current operating status of voltage transformer is judged using Fu's formula algorithm.
Optionally, the operating status current according to voltage transformer, the protection class that voltage transformer is protected
Type, comprising: differential protection, high-pressure side overcurrent protection, low-pressure side overcurrent protection, overheat protector, rate of temperature change protection, mistake
Voltage protection and resonance protection.
The technical solution that embodiments herein provides can include the following benefits:
The application provides a kind of 10 kilovoltage mutual inductors protection system, which is set to secondary connection cabinet door
Place, and installation by adhering is in PT cabinet.The protection system mainly includes circuit breaker cart, arrester handcart, arrester, three height
Six voltage current transformer, four low-voltage current mutual inductors and control module parts.Wherein, the one of three high-tension current inductors
End is connect with voltage transformer, and the other end of three high-tension current inductors is connect with circuit breaker cart, a termination of arrester
The other end on ground, arrester is connect with arrester handcart, and circuit breaker cart and arrester handcart are also connect with power supply buses respectively,
And circuit breaker cart and arrester handcart are connected in parallel, for voltage transformer by a harmonic elimination resistance eutral grounding, four low-tension currents are mutual
Sensor is integrated in control module, and temp probe is additionally provided on voltage transformer.The input terminal of control module respectively with three
High-tension current inductor, four low-voltage current mutual inductors and voltage transformer connection, the output end and breaker of control module
Handcart connection, for the electric parameter and temperature information of real-time collection voltages mutual inductor, and according to electric parameter and temperature information
It triggers circuit breaker cart and carries out fault trip.
Fuse handcart in the prior art is replaced using circuit breaker cart in the application, when detecting that PT breaks down
It can be realized and quick break, advantageously reduce loss, improve the reliability of protection system.And pass through circuit breaker cart and control
The combination of module can realize comprehensive protection to voltage transformer, comprising: resonance protection, differential protection, overvoltage are protected
Shield, overcurrent protection and overheat protector etc. are conducive to the reliability for improving protection system, to improve the accurate of Operation of Electric Systems
Property and reliability.
The application also provides a kind of 10 kilovoltage mutual inductor guard methods, and guard method collection voltages real-time first are mutual
The electric parameter and temperature information of sensor；Then it according to electric parameter collected and temperature information, is calculated using neuroid
Method judges the current operating status of voltage transformer；Operating status finally current according to voltage transformer, to voltage transformer
It is protected.The application according to reflection PT device characteristic and failure cause PT device operating parameter, and use neuron net
Network algorithm judges the current operating status of voltage transformer, so that targetedly various failures are prevented, alarmed and protected
Shield isolation, to realize the various protections to voltage transformer, and then effectively improves the reliability of electric system, can be power grid
Safe operation provide a strong guarantee.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and together with specification it is used to explain the principle of the application.
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram that 10 kilovoltage mutual inductor of one kind provided by the embodiment of the present application protects system；
Fig. 2 be using PT cabinet after 10 kilovoltage mutual inductor protection system of one kind provided by the embodiment of the present application inside
Structural schematic diagram；
Fig. 3 is the connecting pin subgraph of control module in the embodiment of the present application；
Fig. 4 is the control principle drawing of control module in the embodiment of the present application；
Fig. 5 is the flow diagram of 10 kilovoltage mutual inductor guard method of one kind provided by the embodiment of the present application.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The application protection all should belong in technical staff's every other embodiment obtained without making creative work
Range.
The application in order to better understand explains in detail presently filed embodiment with reference to the accompanying drawing.
Embodiment one
Referring to Fig. 1, Fig. 1 is that 10 kilovoltage mutual inductor of one kind provided by the embodiment of the present application protects the structure of system to show
It is intended to.As shown in Figure 1,10 kilovoltage mutual inductors in the present embodiment protect system, specifically include that circuit breaker cart, take shelter from the thunder
Device handcart, arrester, three high-tension current inductors, four low-voltage current mutual inductors and control module totally six part.Wherein, high
Voltage current transformer has three, is respectively used to the high voltage side current of detection A, B, C three-phase PT, in order to find failure electricity in time
Stream, one end of three high-tension current inductors are connect with voltage transformer, and the other end is connect with circuit breaker cart.The one of arrester
End ground connection, the other end are connect with arrester handcart.Circuit breaker cart and arrester handcart are also connect with power supply buses respectively, and disconnected
Road device handcart and arrester handcart are connected in parallel.Power supply buses pass through a harmonic elimination resistance by a capacity earth, voltage transformer
It is grounded, temp probe is additionally provided on voltage transformer, for detecting the temperature of voltage transformer.
Low-voltage current mutual inductor has four, is respectively used to the low-pressure side electric current of detection A, B, C three-phase PT, four low-tension currents
Mutual inductor is integrated in control module.The input terminal of control module respectively with three high-tension current inductors, four low-tension currents
Mutual inductor and voltage transformer connection, the output end of control module are connect with circuit breaker cart, mutual for real-time collection voltages
The electric parameter and temperature information of sensor, and event is carried out according to electric parameter collected and temperature information triggering circuit breaker cart
Barrier tripping, wherein electric parameter includes: primary current, primary voltage, open delta voltage, secondary current and neutral point electricity
Stream.
In the present embodiment on voltage transformer, high-tension current inductor, low-voltage current mutual inductor and voltage transformer
Temp probe electric parameter collected and temperature information, the as remote sensing signal of voltage transformer, telemetered signal and failure letter
Number, for judging the operating status of voltage transformer.
After PT protection system in the application is set in PT cabinet, the schematic diagram of internal structure of PT cabinet is referring to fig. 2.This
Fuse handcart is replaced using circuit breaker cart in the PT protection system of embodiment, and installs arrester handcart additional, can be adopted in time
Collect primary current, primary voltage, open delta voltage, secondary current and neutral point current.The setting of circuit breaker cart, when
When voltage transformer breaks down, can quickly, reliable, accurately tripping circuit breaker, the isolation of failure is realized, to avoid electricity
Pressure mutual inductor explodes.
Further, in this embodiment the output end of control module is also communicated to connect with substation's background system, being used for will
Remote sensing signal, telemetered signal and the fault-signal of voltage transformer are transmitted to substation's background system and electric power dispatching system.
Include CPU, relay unit in control module in the present embodiment, open into unit, temperature sensor unit, exchange
Unit and power supply.Different parts can be respectively arranged on multiple pcb boards.
Specifically, relay unit is used to control the division of breaker according to the judging result of CPU, output contact signal
Movement is alerted, is tripped, a distant place is closed a floodgate and a distant place is jumped when the electric parameter of voltage transformer and exceeded temperature information
Lock.Specifically, relay unit includes 4 relays, diode and optocoupler.It opens into unit for acquiring the position of the switch, open circuit
The location information of the position and protection system of device handcart and arrester handcart.Temperature sensor unit is used for temp probe
The temperature information of voltage transformer collected is transmitted to relay unit.Alternating current unit is for acquiring three high-tension current mutual inductances
The voltage signal of the current signal of device, the current signal of four low-voltage current mutual inductors and voltage transformer, and will be acquired
Current signal and voltage signal be converted to the analog signals of 0-3.3V, that is, pass through alternating current unit collection voltages mutual inductor
The four of on high-tension side three road current signal, four road current signals of voltage transformer low-pressure side and voltage transformer low-pressure side
Road voltage signal, and current signal collected and voltage signal are converted to the analog signals of 0-3.3V.CPU is for controlling
It opens and carries out data acquisition into unit, carry out calculation process by analog signals of the AD converter to alternating current unit, and judge electricity
Press electric parameter and the temperature information of mutual inductor whether exceeded.
Each section connection relationship may refer to Fig. 3 in the present embodiment control module, and Fig. 3 is to control mould in the embodiment of the present application
The connecting pin subgraph of block.Wherein RELAY be relay unit, by taking RELAY relay as an example, in relay unit include 4 groups after
Electric appliance is respectively used to movement, alarm, tripping and closing operation.Power supply, relay unit and output switch parameter part can be set
In on this pcb board of RELAY；AC is alternating current unit, is used for voltage and current sampling processing；CPU is used to handle the number of analysis acquisition
According to；DI is to open into unit, is used for On-off signal part, temperature sensor unit and On-off signal part can be set in DI
On this pcb board.
The control principle of control module is detailed in Fig. 4 in the present embodiment, and in Fig. 4, TA is current transformer, and TV is mutual induction of voltage
Device, ST are temperature sensor.As shown in Figure 4, electric current, voltage and temperature signal are transmitted to control module, this reality by TA, TV, ST
Apply the basic functional principle of control module in example are as follows: control module judges whether voltage transformer is in normal operation by CPU
Or malfunction, relay unit output contact signal is driven, to control the division movement of breaker.
It further, still include human-computer interaction module in the PT protection system of the present embodiment, the human-computer interaction module
In include display and keyboard, display be used for the remote sensing signal of mutual inductor, telemetered signal, fault-signal, electric parameter and
Temperature information is shown that keyboard is for obtaining control instruction.
System is protected by the PT in the application, the operating parameter of PT can be obtained in real time, CPU is according to these operating parameters
Using neural network algorithm, the real-time running state of PT is judged, realize fast differential over current protection, high-pressure side over current protection to PT
Shield, the protection of low-pressure side overcurrent protection, overheat protector, rate of temperature change, overvoltage protection and resonance protection.
Embodiment two
Referring to Fig. 5 on Fig. 1-embodiment illustrated in fig. 4 basis, Fig. 5 is one kind 10 provided by the embodiment of the present application
The flow diagram of kilovoltage mutual inductor guard method.As shown in Figure 5,10 kilovoltage mutual inductor protection side of the present embodiment
Method mainly includes the following steps:
S1: the electric parameter and temperature information of real-time collection voltages mutual inductor.Wherein, electric parameter include: primary current,
Primary voltage, open delta voltage, secondary current and neutral point current.
The acquisition of temperature information can be acquired by the way that a temp probe is arranged on voltage transformer by temp probe
The temperature of voltage transformer.
S2: according to electric parameter and temperature information, the current operation of voltage transformer is judged using neural network algorithm
State.
Neural network algorithm in the present embodiment can use Fu's formula algorithm.According to voltage transformer in the present embodiment
Electric parameter and temperature information judge the method for voltage transformer current operating conditions using Fu's formula algorithm, can use existing
Fu's formula algorithm in technology.
S3: according to the current operating status of voltage transformer, voltage transformer is protected.
Specifically, the operating status current according to voltage transformer, to the protection type that voltage transformer is protected, packet
It includes: differential protection, high-pressure side overcurrent protection, low-pressure side overcurrent protection, overheat protector, rate of temperature change protection, overvoltage
Protection and resonance protection.
It is main to the method that voltage transformer is protected according to the operating status that voltage transformer is current in the present embodiment
If setting the threshold value of various protection act startings, when voltage transformer is in current operating status, operating parameter exceeds
When the threshold value of setting, the corresponding protection of starting immediately.
Differential protection, that is, difference current fast tripping protection is quickly cut mainly in the differential generation catastrophe failure in the inside of PT
Except transformer, when any difference current value > differential concludes value, start differential protection.
High-pressure side overcurrent protection is that high-pressure side overcurrent element is connected to the secondary three-phase circuit of PT high voltage side current mutual inductor
In, when any phase current meets following condition, overcurrent element movement:
Any phase high voltage side current value > action current setting valve.
Low-pressure side overcurrent protection is that low-pressure side overcurrent element is connected to PT low-pressure side Current Transformer Secondary three-phase circuit
In, when any phase current meets following condition, overcurrent element movement:
Any phase low-pressure side current value > action current setting valve.
Overheat protector is to measure to the three-phase temperature of PT, and be compared with room temperature.When PT failure or exception,
Overtemperature is out-of-limit, the movement of starting overheat protector or alarm.That is: any phase PT temperature value > overheat protector setting valve when, start excess temperature
Protection.
Rate of temperature change protect TC " 2.7 zero sequence overcurrents alarm and trip protection " fC l " 3 ", and to PT three-phase temperature
It measures, when PT failure or exception, when temperature rises too fast and super rate of temperature change definite value, start-up temperature change rate is protected
Shield movement or alarm.That is: when rate of temperature change > rate of temperature change protection seting value, start-up temperature rate of change protection.
Resonance protection is the voltage that the open delta voltage of PT is decomposed into tetra- kinds of frequencies of 17Hz, 25Hz, 50Hz, 150Hz
Component can distinguish overvoltage, ferromagnetic resonance and single-phase earthing, and trip or alert.Specifically, 50Hz harmonic voltage is normal
Voltage, 17Hz harmonic voltage > 17Hz harmonic voltage protection seting value or the protection of 25Hz harmonic voltage > 25Hz harmonic voltage are whole
When definite value or 150Hz harmonic voltage > 150Hz harmonic voltage protection seting value, start resonance protection.
According to the main protection that ferromagnetic resonance feature, this implementation protect resonance protection as PT, in non-effectively earthed system
In, the oscillation circuit of nonlinear inductance element and capacity cell composition.The natural frequency of vibration is less than certain infra-low frequency when the linear condition of circuit
Resonance frequency, when inductance reduces when core sataration, the circuit natural frequency of vibration increases to the resonance frequency of exactly equal to certain infra-low frequency；
It is lost sufficiently small in oscillation circuit, so resonance actually occurs at, system is unloaded or underloading.And appearance is in the PT course of work
The light condition of resonance easily occurs, the guard method of the application can provide in time voltage transformer effective resonance protection.
The part that the embodiment is not described in detail, is referred to Fig. 1-embodiment one shown in Fig. 4, between two embodiments
Can mutual reference, details are not described herein.
In conclusion operating parameter of the present embodiment according to reflection PT device characteristic and the PT device of failure cause, and adopt
The current operating status of voltage transformer is judged with neural network algorithm, targetedly various failures can be carried out pre-
Anti-, alarm and protective separation, to realize the various protections to voltage transformer, and then effectively improve the reliable of electric system
Property, it can be provided a strong guarantee for the safe operation of power grid.
The above is only the specific embodiment of the application, is made skilled artisans appreciate that or realizing this Shen
Please.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the application.Therefore, the application
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (7)
1. a kind of 10 kilovoltage mutual inductors protect system, the protection system is set at secondary connection cabinet door, and is embedded in
Formula is installed in PT cabinet, which is characterized in that the protection system includes: circuit breaker cart, arrester handcart, arrester, three
High-tension current inductor, four low-voltage current mutual inductors and control module；
One end of three high-tension current inductors is connect with the voltage transformer, three high-tension current inductors
The other end is connect with circuit breaker cart, and one end ground connection of the arrester, the other end and arrester handcart of the arrester connects
It connects, the circuit breaker cart and arrester handcart are also connect with power supply buses respectively, and the circuit breaker cart and arrester hand
Vehicle is connected in parallel, and the voltage transformer is integrated in control by a harmonic elimination resistance eutral grounding, four low-voltage current mutual inductors
In module, temp probe is additionally provided on the voltage transformer；
The input terminal of the control module is mutual with three high-tension current inductors, four low-voltage current mutual inductors and voltage respectively
Sensor connection, the output end of the control module are connect with circuit breaker cart, the electrical ginseng for real-time collection voltages mutual inductor
Several and temperature information, and fault trip is carried out according to the electric parameter and temperature information triggering circuit breaker cart, it is described electrical
Parameter includes: primary current, primary voltage, open delta voltage, secondary current and neutral point current.
2. a kind of 10 kilovoltage mutual inductor according to claim 1 protects system, which is characterized in that the control module
Output end also with substation's background system communicate to connect.
3. a kind of 10 kilovoltage mutual inductor according to claim 1 protects system, which is characterized in that the control module
Including CPU, relay unit, open into unit, temperature sensor unit, alternating current unit and power supply；
The relay unit, for the judging result according to CPU, output contact signal controls the division movement of breaker；
It is described to open into unit, for acquiring the position of the position of the switch, circuit breaker cart and arrester handcart and protecting system
Location information；
The temperature sensor unit, for the temperature information of temp probe voltage transformer collected to be transmitted to relay
Unit；
The alternating current unit, for acquiring the current signal of three high-tension current inductors, the electricity of four low-voltage current mutual inductors
The voltage signal of signal and voltage transformer is flowed, and current signal collected and voltage signal are converted to the mould of 0-3.3V
Analog quantity signal；
The CPU carries out data acquisition into unit for controlling to open, by AD converter to the analog signals of alternating current unit into
Row calculation process, and judge whether the electric parameter of voltage transformer and temperature information are exceeded.
4. a kind of 10 kilovoltage mutual inductor according to claim 1 to 3 protects system, which is characterized in that described
Further include human-computer interaction module in protection system, includes display and keyboard in the human-computer interaction module, for mutual to voltage
The electric parameter and temperature information of sensor shown, and for obtaining control instruction.
5. a kind of 10 kilovoltage mutual inductor guard methods, which is characterized in that the guard method includes:
The electric parameter and temperature information of real-time collection voltages mutual inductor, the electric parameter include: primary current, primary electricity
Pressure, open delta voltage, secondary current and neutral point current；
According to the electric parameter and temperature information, the current operation shape of voltage transformer is judged using neural network algorithm
State；
According to the current operating status of voltage transformer, voltage transformer is protected.
6. a kind of 10 kilovoltage mutual inductor guard method according to claim 5, which is characterized in that described according to
Electric parameter and temperature information judge the current operating status of voltage transformer using neural network algorithm, specifically:
According to the electric parameter and temperature information, the current operating status of voltage transformer is judged using Fu's formula algorithm.
7. a kind of 10 kilovoltage mutual inductor guard method according to claim 5, which is characterized in that described according to voltage
The current operating status of mutual inductor, the protection type that voltage transformer is protected, comprising: differential protection, high-pressure side are excessively electric
Flow protection, the protection of low-pressure side overcurrent protection, overheat protector, rate of temperature change, overvoltage protection and resonance protection.
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Cited By (5)
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| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN111969559A (en) * | 2020-09-09 | 2020-11-20 | 广东电网有限责任公司 | Voltage transformer cabinet fault protection device and method |
| CN112130020A (en) * | 2020-09-24 | 2020-12-25 | 中车大同电力机车有限公司 | High-voltage electrical appliance early warning method and device for rolling stock, medium and electronic equipment |
| CN112379143A (en) * | 2020-11-12 | 2021-02-19 | 山东东冠电气有限公司 | Comprehensive control device for voltage transformer |
| CN114252674A (en) * | 2021-12-15 | 2022-03-29 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
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| EP1727257A1 (en) * | 2005-05-25 | 2006-11-29 | ABB Sp.zo.o. | A protection circuit for potential transformers |
| CN101557083A (en) * | 2009-01-20 | 2009-10-14 | 上海合凯电力保护设备有限公司 | Handcart-type switch arc suppression device |
| CN201584679U (en) * | 2009-12-17 | 2010-09-15 | 湖南雁能森源电力设备有限公司 | Voltage transformer cabinet |
| CN105098712A (en) * | 2015-08-25 | 2015-11-25 | 国家电网公司 | Protection equipment for 6-35kV power grid voltage transformers |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
| CN111969559A (en) * | 2020-09-09 | 2020-11-20 | 广东电网有限责任公司 | Voltage transformer cabinet fault protection device and method |
| CN112130020A (en) * | 2020-09-24 | 2020-12-25 | 中车大同电力机车有限公司 | High-voltage electrical appliance early warning method and device for rolling stock, medium and electronic equipment |
| CN112379143A (en) * | 2020-11-12 | 2021-02-19 | 山东东冠电气有限公司 | Comprehensive control device for voltage transformer |
| CN114252674A (en) * | 2021-12-15 | 2022-03-29 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
| CN114252674B (en) * | 2021-12-15 | 2023-09-22 | 中国化学工程第十一建设有限公司 | Secondary wiring detection device and method |
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