CN107993540A - A kind of microcomputer protective relay teaching experiment system - Google Patents
A kind of microcomputer protective relay teaching experiment system Download PDFInfo
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- CN107993540A CN107993540A CN201810034234.6A CN201810034234A CN107993540A CN 107993540 A CN107993540 A CN 107993540A CN 201810034234 A CN201810034234 A CN 201810034234A CN 107993540 A CN107993540 A CN 107993540A
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Abstract
The present invention devises a kind of experimental system applied to microcomputer protective relay teaching; including digital operation module 1, electric quantity acquisition and control module 2 and data interaction module 3, wherein the digital operation module 1 is connected with the electric quantity acquisition with control module 2, the data interaction module 3 respectively；The operational model of the different relay protection types of structure in the digital operation module 1; according to the electric quantity acquisition and the data of control module 2; pass through the manually or automatically setting of the data interaction module 3; the experimental system for forming different relay protection types realizes breakdown judge and control, and records related operation information.The present invention can integrate all kinds of microcomputer protective relay modes in unified experiment porch, a variety of microcomputer protective relay experiments can be carried out, so as to improve the result of training of relay protection of power system operations staff.
Description
Technical field
The present invention relates to electric system experiment device for teaching field, more particularly to a kind of microcomputer protective relay teaching experiment system
System.
Background technology
Mainly include various fault signatures in the teaching process of microcomputer protective relay technology and its in the physical quantitys such as electricity
Embodiment, the practice and test of parameter tuning method.The microcomputer relay used in electric system is directly used to protect in experimental teaching
Protection unit exists since relay protection type diversity and otherness result in the need for a variety of microcomputers guarantors in teaching as instruments used for education
The problem of protection unit, be unfavorable for the development of education activities, while is only microcomputer protective relay device in experimental teaching and uses, nothing
The learning process of microcomputer protective relay technology is presented in method comprehensively.For relay protection learner, also without corresponding detailed
The principles and methods of process, increase learning difficulty.
Microcomputer protective relay is more demanding in terms of the speed of service and computational accuracy, is adopted generally directed to different protection types
It is expensive with different special equipments.Imparted knowledge to students using the microcomputer protective relay device run in Practical Project, there is money
The problem of source waste and wide variety, and existing microcomputer protective relay experimental provision is to different types of the means of relay protection
It is compatible not enough generally to lay stress in the verification of experiment parameter, can not present comprehensively microcomputer protective relay technological learning and
Emphasis and difficult point in practice process, are unfavorable for the development of experimental teaching.
For this reason, it may be necessary to study a kind of microcomputer protective relay instructional technology, a variety of allusion quotations can be developed on single experimental provision
The relay protection experimental of type, so that for the Link of Practice Teaching of Protection Technology personnel, improves Protection Technology
Practise effect.
The content of the invention
Being capable of compatible common electric system it is an object of the invention to overcome above-mentioned technical problem and provide one kind
The thought of the hardware and software module of relay protection type, builds Experimental System for Microcomputer Relaying Protection.
To achieve the above object, the present invention devises a kind of experimental system applied to microcomputer protective relay teaching, including
Digital operation module 1, electric quantity acquisition and control module 2 and data interaction module 3, wherein the digital operation module 1 respectively and
The electric quantity acquisition is connected with control module 2, the data interaction module 3；Structure is different in the digital operation module 1
The operational model of relay protection type, according to the electric quantity acquisition and the data of control module 2, passes through the data interaction module
3 manually or automatically setting, the experimental system for forming different relay protection types realizes breakdown judge and control, and records correlation
Operation information.
Wherein, the electric quantity acquisition includes analog measurement module 21, switch measurement module 22 with control module 2 and opens
Pass amount output module 23 is formed, and is independent modular unit, and can be combined according to relay protection type selector channel.
Wherein, the relay protection operational model built in the digital operation module 1, can pass through the data interaction mould
The manually or automatically set-up mode of block 3 makes choice, and carries out specific data and hardware resource configuration according to above-mentioned selection；Number
It is configured according to configuration mainly for all kinds of factors in relay protection setting method in operational model；Hardware resource configuration is main
For relay protection type and its operational model configuration of selection the analog measurement module 21, switch measurement module 22
With the specific passage of switching value output module 23.
Wherein, in the digital operation module 1 flow scheme design is used in the design of the relay protection operational model of structure
Scheme；The process design plan is provided with basic in multiple and different a flowsheeting difference relay protection type operational process
Program and running abnormality processing are controlled, each flow includes several steps, for simulating relay protection Detection ＆ Controling
Program or the concrete operation step of troubleshooting, contain in each flow jump procedure number, operation maximum time, condition set and
Actuating of relay collection.
Wherein, flow is divided into simple operations flow and multi-step process operating process.
Wherein, the simple operations flow is used for the troubleshooting in microcomputer protective relay operational process, simply in step
Middle detection operating condition collection, if meeting established condition, performs the set actuating of relay, the step is exited if being unsatisfactory for.
Wherein, in multi-step process operating process, since first step, the timing cycle inspection within operation maximum time
Condition set is surveyed, if meeting established condition, the set actuating of relay is performed and enters next step, if not satisfied, continuing cycling through
When being exhausted until operating maximum time, if condition set is still unsatisfactory for, the circulation is exited, into the new step pointed by jump procedure number
Suddenly continue to execute.
Wherein, the relay protection operational model based on the simple operations flow scheme design includes single-phase under-voltage protection, tool
Body includes：
1. all AC electric quantities of collection, obtain the sampled data of each AC electric quantity；
2. select certain A phase line voltage sample data；
3. calculate amplitude according to certain A phase line voltage samples data；
4. selecting under-voltage protection module, that is, judge that certain A phase lines voltage is less than threshold value, be judged as breaking down and be transferred to
5th step, otherwise returns to the 1st step；
5. according to actuating of relay collection output relay control signal.
Wherein, the relay protection operational model based on multi-step process operating process design passes by electricity including triple line
Stream protection, specifically includes：
1. all AC electric quantities of collection, obtain the sampled data of each AC electric quantity；
2. select certain three-phase line current sampling data；
3. amplitude is calculated according to certain three-phase line current sampling data；
4. select I section of overcurrent, II sections, III root modules, that is, judge certain three-phase line electric current amplitude and I sections of overcurrent,
II sections, III sections of threshold value, wherein action setting valve is successively from big to small, if amplitude is higher than I sections of threshold values of overcurrent, are judged as
Break down and be transferred to the 5th step；If amplitude between I sections and II sections threshold values of overcurrent, starts the first timing T1 until meter
When terminate, be judged as breaking down and be transferred to the 5th step；If amplitude between II sections and III sections threshold values of overcurrent, starts the
Two timing T2 are judged as breaking down and are transferred to the 5th step until timing terminates；If above-mentioned condition collection is unsatisfactory for, it is transferred to
The circulation of 1st step is detected, until operation maximum time exhausts, then exits the three-phase line overcurrent protection.
5. according to actuating of relay collection output relay control signal.
Wherein, switching value output module 23 includes control relay circuit, and the control relay circuit includes direct current
Power supply, main switch S2, first switch pipe S1, discharge switch pipe S3, charging resistor R, two-way DC/DC converters, storage capacitor
C1 and C2 and control unit, DC power output end are connected with dc bus, and it is positive and negative that storage capacitor C1 is parallel to dc bus
Pole, is in series with main switch S2 on dc bus, for control direct current bus bar can input, first switch pipe S1 and charging
Resistance R connects to form the first charging paths, and the first charging paths are in parallel with main switch S2, and two-way DC/DC converters one end connects
Storage capacitor C2 is met, the other end is in parallel with dc bus, and switching tube S3 is used for the output for controlling direct current bus bar energy；On first
When electric, the first switch pipe S1 in the first charging paths is closed, an electric energy part for DC power supply charges to storage capacitor C1, separately
A part charges by two-way DC/DC converters to storage capacitor C2, when the voltage of storage capacitor C2 rises to the first setting value
When, control unit controls two-way DC/DC converters to stop charging to storage capacitor C2, and the electric energy in storage capacitor C2 is released
Charge to the storage capacitor C1 on dc bus, when the storage capacitor C1 voltages in high voltage direct current reach stable state, and master
Main switch S2 is closed when the voltage of switching tube both sides is equal, disconnects first switch pipe S1 after main switch S2 closures, first
Power on end.
The beneficial effects of the practice of the present invention is：All kinds of microcomputer protective relay modes can be integrated in unified experiment porch, can be into
The a variety of microcomputer protective relay experiments of row, so as to improve the result of training of relay protection of power system operations staff.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is the flow chart of simple operations flow.
Fig. 3 is the flow chart of multi-step process operating process.
Fig. 4 is the control relay circuit schematic diagram of the present invention.
Embodiment
One the present invention is described in detail below in conjunction with the accompanying drawings.
As shown in attached drawing one, it is known that the system includes digital operation module 1, electric quantity acquisition and control module 2 and data are handed over
Mutual module 3.The digital operation module 1 and electric quantity acquisition is connected with control module 2, data interaction module 3.
Wherein, the different relay protection types of structure (protect by overcurrent protection, low-voltage in the digital operation module 1
Shield, distance protection, differential protection etc.) operational model, according to the data of the electric quantity acquisition and control module 2, by described
The manually or automatically setting of data interaction module 3, realizes that different typical thes means of relay protection realize breakdown judge and control, and remembers
Picture recording closes operation information.
The electric quantity acquisition includes analog measurement module 21, switch measurement module 22 and switching value with control module 2
Output module 23 is formed, and is independent modular unit.The analog measurement module 21, switch measurement module 22 and open
Pass amount output module 23 can be combined according to relay protection type selector channel.
The analog measurement module 21 can gather direct current and ac analog, and DC analogue quantity interface includes 0-5V
Voltage and the general electricity access way of 0-20mA electric currents, ac analog interface include rated voltage 100V mutual inductor alternating currents
Pressure and rated current 60A mutual inductor alternating current access ways.
The relay protection operational model of structure, can pass through the data interaction module 3 in the digital operation module 1
Manually or automatically set-up mode makes choice, and carries out specific data and hardware resource configuration according to above-mentioned selection.Data are matched somebody with somebody
Put and be configured mainly for all kinds of factors in relay protection setting method in operational model；Hardware resource configuration mainly for
The relay protection type and its operational model of selection configure the analog measurement module 21, switch measurement module 22 and open
The specific passage of output module 23 is measured in pass, forms complete relay protection experimental platform.
In the digital operation module 1 flow scheme design thinking is used in the design of the relay protection operational model of structure.
Electric quantity acquisition and the implication of all kinds of gathered datas in control module 2 are not specifically defined in scheme, specific definition
All completed with computing by the parameter setting in process design plan.It is different that process design plan is provided with several flowsheetings
Primary control program (PCP) and running abnormality processing in relay protection type operational process, each flow are walked comprising several
Suddenly, for simulating the concrete operation step of relay protection Detection ＆ Controling program or troubleshooting, jump is contained in each flow
The number of going to step, operation maximum time, condition set and actuating of relay collection.Flow is divided into simple operations flow and multi-step process behaviour
Make flow.As long as simple operations flow as shown in Figure 2 complete by a step, this is used for microcomputer protective relay operational process
In troubleshooting, be not in contact between this process step, operating condition collection simply detected in step, if meeting set bar
Part, then perform the set actuating of relay, and the step is exited if being unsatisfactory for, and it is nonsensical in this case to operate maximum time；Separately
One kind needs multiple steps to complete as shown in Figure 3 for multi-step process operating process, after flow number is confirmed, from first
Step starts, and the timing cycle detection condition set within operation maximum time, if meeting established condition, performs set relay and move
Make and enter next step, if not satisfied, continuing cycling through when exhausting operation maximum time, if condition set is still unsatisfactory for, move back
Go out the circulation, continued to execute into the new step pointed by jump procedure number.Base of the process design plan microcomputer protective relay
The troubleshooting of this control program and operation is all included, with more globality.
Process design plan can set the number of main-process stream and each flow according to the common situation of microcomputer protective relay
Number of steps, includes jump procedure number, condition set and actuating of relay collection in each step.Condition set includes the analog quantity
The hardware resource of measurement module 21 and switch measurement module 22, actuating of relay collection include the hardware of switching value output module 23
Resource.
Such as：Single-phase (such as certain A phase line) under-voltage protection uses simple operations, comprises the following steps that：
1. all AC electric quantities of collection, obtain the sampled data of each AC electric quantity；
2. select certain A phase line voltage sample data；
3. calculate amplitude according to certain A phase line voltage samples data；
4. selecting under-voltage protection module, that is, judge that certain A phase lines voltage is less than threshold value, be judged as breaking down and be transferred to
5th step, otherwise returns to the 1st step；
5. according to actuating of relay collection output relay control signal.
Again for example：Three-phase line overcurrent protection uses multi-step operating process, comprises the following steps that：
1. all AC electric quantities of collection, obtain the sampled data of each AC electric quantity；
2. select certain three-phase line current sampling data；
3. amplitude is calculated according to certain three-phase line current sampling data；
4. select I section of overcurrent, II sections, III root modules, that is, judge certain three-phase line electric current amplitude and I sections of overcurrent,
II sections, III sections of threshold value (acting setting valve successively from big to small), if amplitude is higher than I sections of threshold values of overcurrent, are judged as occurring
Failure is simultaneously transferred to the 5th step；If amplitude between I sections and II sections threshold values of overcurrent, starts the first timing T1 until timing knot
Beam, is judged as breaking down and is transferred to the 5th step；If amplitude between II sections and III sections threshold values of overcurrent, starts the second meter
When T2 until timing terminates, be judged as breaking down and be transferred to the 5th step；If above-mentioned condition collection is unsatisfactory for, the 1st step is transferred to
Circulation is detected, until operation maximum time exhausts, then exits the three-phase line overcurrent protection.
5. according to actuating of relay collection output relay control signal.
In the prior art, relay coil needs large driven current density to produce action, if directly passing through power power-supply
Power power-supply heaviness and inefficiency can be made by providing the high current, therefore generally give storage capacitor to charge by power supply, then through storage
Can capacitance electric discharge produce high current so as to drive relay coil, physical circuit includes DC power supply, main switch S2, directly
Stream busbar, storage capacitor C1 and discharge switch pipe S3, wherein DC power output end are connected with dc bus input terminal, energy storage
Capacitance C1 is parallel between dc bus positive and negative anodes, and for storing the electric energy of DC power supply output, main switch S2 is connected on directly
Flow on busbar, for controlling the input of direct current bus bar energy, discharge switch pipe S3 is used to control the defeated of direct current bus bar energy
Go out.
Specific control process is as follows：When powering on first, main switch S2 is closed, DC power supply is energy storage electricity through dc bus
Capacity charge, DC power output voltage is equal to storage capacitor both end voltage after charging complete, when discharge switch pipe S3 is closed, storage
Energy capacitance electric discharge, since storage capacitor capacitance is very big, discharge current is very big.But when the system is first powered on, due to capacitance
Presence, if directly closing main switch S2, then exist during due to closure between direct current source and dc bus side compared with
Big voltage difference, will flow through great electric current in main switch S2, easily main switch S2 be caused to damage, while influence to store up
The service life of energy capacitance.
To solve the above-mentioned problems, the present invention in provide one kind can effectively reduce power on first main switch S2 closure when
Produce the control relay circuit of high current.As shown in figure 4, the control relay circuit include DC power supply, main switch S2,
First switch pipe S1, discharge switch pipe S3, charging resistor R, two-way DC/DC converters, storage capacitor C1 and C2 and control are single
First (not shown), DC power output end are connected with dc bus, and storage capacitor C1 is parallel to dc bus positive and negative anodes, direct current
It is in series with main switch S2, first switch pipe S1 and charging resistor R on busbar to connect to form the first charging paths, the first charging branch
Road is in parallel with main switch S2, and two-way DC/DC converters one end connects storage capacitor C2, and the other end is in parallel with dc bus, uses
Charge after the electric energy of storage capacitor C2 is transformed to storage capacitor C1, alternatively, will be given after the transformation of electrical energy on dc bus
Storage capacitor C2 charges, and discharge switch pipe S3 is used for the output for controlling direct current bus bar energy, and control unit is used to gather direct current
The output voltage of power supply, the voltage of storage capacitor C2 and DC bus-bar voltage (i.e. the voltage of storage capacitor C1), on first
Discharge and recharge during electricity and normal work to storage capacitor C2 is controlled.
The course of work is as follows：When powering on first, the first switch pipe S1 in the first charging paths, the electricity of DC power supply are closed
A part of it can charge to storage capacitor C1, another part charges by two-way DC/DC converters to storage capacitor C2, when energy storage is electric
When the voltage of appearance C2 rises to the first setting value, control unit controls two-way DC/DC converters to stop charging to storage capacitor C2,
And the electric energy in storage capacitor C2 is released and is charged to the storage capacitor C1 on dc bus, when storage capacitor C1 voltages reach
To stable state, and main switch S2 both sides voltage it is equal when close main switch S2, the is disconnected after main switch S2 closures
One switching tube S1, powers on end first.During powering on first, since the metering function of discharge resistance R can effectively subtract
Small charging current, and by the way that the energy of storage capacitor C2 is released to storage capacitor C1 through two-way DC/DC converters, so as to
So that the voltage of dc bus side and the voltage of direct current source are almost equal, i.e., voltage difference is almost nil, further reduces
High current caused by main switch S2 closures.
In course of normal operation, main switch S2 is kept closed, and control unit controls two-way DC/DC converters again
Charge to storage capacitor C2, when the voltage of storage capacitor C2 rises to the second setting value, storage capacitor C2 charging completes are two-way
DC/DC converters are in standby, wherein the second setting value is more than the first setting value；When DC power supply is normal, discharge switch pipe S3
During closure, control unit control DC power supply and storage capacitor C1 power to relay coil together, drive the actuating of relay, complete
Into switch motion；Work as D. C. power source breakdown, when discharge switch pipe S3 is closed, control unit controls two-way DC/DC converters to store up
Electric energy release in energy capacitance C2, and storage capacitor C1 give relay coil to power together, drive the actuating of relay, at this time energy storage
Capacitance C2 plays the role of stand-by power supply, ensures relay execution in the case of D. C. power source breakdown with this, improves
The Reliability of Microprocessor of relay.
Example given above is to illustrate the present invention and its actual effect, and non-invention is made in any form
Limitation, any one those skilled in the art is in the range of without departing from technical solution of the present invention, according to above technology and method
The equivalent embodiment of equivalent variations should be considered as by making certain modification and change.
Claims (10)
1. a kind of microcomputer protective relay teaching experiment system, it is characterised in that including digital operation module 1, electric quantity acquisition and control
Molding block 2 and data interaction module 3, wherein the digital operation module 1 respectively with the electric quantity acquisition and control module 2, institute
Data interaction module 3 is stated to connect；The operational model of the different relay protection types of structure, root in the digital operation module 1
According to the electric quantity acquisition and the data of control module 2, by the manually or automatically setting of the data interaction module 3, formed not
Experimental system with relay protection type realizes breakdown judge and control, and records related operation information.
2. microcomputer protective relay teaching experiment system according to claim 1, it is characterised in that the electric quantity acquisition and control
Molding block 2 includes analog measurement module 21, switch measurement module 22 and switching value output module 23 and forms, and is independent
Modular unit, and can be combined according to relay protection type selector channel.
3. microcomputer protective relay teaching experiment system according to claim 2, it is characterised in that the digital operation mould
The relay protection operational model of structure, can be selected by the manually or automatically set-up mode of the data interaction module 3 in block 1
Select, and specific data and hardware resource configuration are carried out according to above-mentioned selection；Data configuration is mainly for relay in operational model
All kinds of factors in protection seting method are configured；Hardware resource configures the relay protection type and its fortune mainly for selection
Calculate the specific logical of the model configuration analog measurement module 21, switch measurement module 22 and switching value output module 23
Road.
4. microcomputer protective relay teaching experiment system according to claim 3, it is characterised in that the digital operation mould
In block 1 process design plan is used in the design of the relay protection operational model of structure；The process design plan is provided with more
Primary control program (PCP) and running abnormality processing in a different flowsheeting difference relay protection type operational process, often
A flow includes several steps, for simulating the concrete operation step of relay protection Detection ＆ Controling program or troubleshooting,
Each flow includes jump procedure number, operation maximum time, condition set and actuating of relay collection.
5. microcomputer protective relay teaching experiment system according to claim 4, it is characterised in that flow is divided into simple operations
Flow and multi-step process operating process.
6. microcomputer protective relay teaching experiment system according to claim 5, it is characterised in that the simple operations flow
For the troubleshooting in microcomputer protective relay operational process, operating condition collection is detected in step, if meeting established condition,
Perform the set actuating of relay.
7. microcomputer protective relay teaching experiment system according to claim 5, it is characterised in that multi-step process operation stream
Cheng Zhong, since first step, the timing cycle detection condition set within operation maximum time, if meeting established condition, holds
The set actuating of relay of row simultaneously enters next step, if not satisfied, continuing cycling through when exhausting operation maximum time, if condition
Collection is still unsatisfactory for, and the circulation is exited, into the next step.
8. microcomputer protective relay teaching experiment system according to claim 6, it is characterised in that based on the simple operations
The relay protection operational model of flow scheme design includes single-phase under-voltage protection, specifically includes：
1. all AC electric quantities of collection, obtain the sampled data of each AC electric quantity；
2. select certain A phase line voltage sample data；
3. calculate amplitude according to certain A phase line voltage samples data；
4. selecting under-voltage protection module, that is, judge that certain A phase lines voltage is less than threshold value, be judged as breaking down and be transferred to the 5th
Step, otherwise returns to the 1st step；
5. according to actuating of relay collection output relay control signal.
9. microcomputer protective relay teaching experiment system according to claim 7, it is characterised in that based on the multi-step journey
The relay protection operational model of sequence operating process design includes three-phase line overcurrent protection, specifically includes：
1. all AC electric quantities of collection, obtain the sampled data of each AC electric quantity；
2. the selection three-phase line current sampling data；
3. amplitude is calculated according to the three-phase line current sampling data；
4. selecting I sections of overcurrent, II sections, III root modules, that is, judge the amplitude and I sections of overcurrent, II of certain three-phase line electric current
Section, III sections of threshold value, wherein the threshold value successively from big to small, if amplitude is higher than I sections of threshold values of overcurrent, is judged as occurring
Failure is simultaneously transferred to the 5th step；If amplitude between I sections and II sections threshold values of overcurrent, starts the first timing T1 until timing knot
Beam, amplitude still are judged as breaking down and are transferred to the 5th step between I sections and II sections threshold values of overcurrent；If amplitude is between mistake
Between II sections and III sections threshold values of electric current, start the second timing T2 until timing terminates, amplitude is still between II sections of overcurrent and III
It is judged as breaking down between section threshold value and is transferred to the 5th step, wherein the second timing T2 is more than the first timing T1；If above-mentioned condition
Collection is unsatisfactory for, then is transferred to the circulation of the 1st step and is detected, until operation maximum time exhausts, exit the three-phase line overcurrent
Protection.
5. according to actuating of relay collection output relay control signal.
10. according to claim 1-9 any one of them microcomputer protective relay teaching experiment systems, it is characterised in that switching value
Output module 23 includes control relay circuit, and the control relay circuit includes DC power supply, main switch S2, first
Switching tube S1, discharge switch pipe S3, charging resistor R, two-way DC/DC converters, storage capacitor C1 and C2 and control unit, directly
Galvanic electricity source output terminal is connected with dc bus, and storage capacitor C1 is parallel to dc bus positive and negative anodes, and master is in series with dc bus
Switching tube S2, for controlling the input of direct current bus bar energy, first switch pipe S1 connects to form the first charging with charging resistor R
Branch, the first charging paths are in parallel with main switch S2, and two-way DC/DC converters one end connects storage capacitor C2, the other end with
Dc bus is in parallel, and switching tube S3 is used for the output for controlling direct current bus bar energy；When powering on first, the first charging paths are closed
In first switch pipe S1, DC power supply electric energy a part to storage capacitor C1 charge, another part by two-way DC/DC change
Parallel operation charges to storage capacitor C2, and when the voltage of storage capacitor C2 rises to the first setting value, control unit controls two-way DC/
DC converters stop charging to storage capacitor C2, and the electric energy in storage capacitor C2 is released to the storage capacitor on dc bus
C1 charges, when the storage capacitor C1 voltages in high voltage direct current reach stable state, and main switch both sides voltage it is equal when
Main switch S2 is closed, first switch pipe S1 is disconnected after main switch S2 closures, powers on end first.
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| CN201810034234.6A CN107993540A (en) | 2018-01-15 | 2018-01-15 | A kind of microcomputer protective relay teaching experiment system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110827637A (en) * | 2019-11-29 | 2020-02-21 | 华北科技学院 | Microcomputer relay protection experimental board |
| CN111562456A (en) * | 2020-04-30 | 2020-08-21 | 国网河北省电力有限公司电力科学研究院 | Relay protection enhancement type state sequence and relay protection test method and system |
| CN113300244A (en) * | 2021-06-15 | 2021-08-24 | 新兴铸管股份有限公司 | Protection device for protecting various microcomputers |
| CN113315375A (en) * | 2021-05-10 | 2021-08-27 | 江苏阿诗特能源科技有限公司 | Bidirectional BUCK-BOOST circuit and method based on battery charging and discharging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110827637A (en) * | 2019-11-29 | 2020-02-21 | 华北科技学院 | Microcomputer relay protection experimental board |
| CN111562456A (en) * | 2020-04-30 | 2020-08-21 | 国网河北省电力有限公司电力科学研究院 | Relay protection enhancement type state sequence and relay protection test method and system |
| CN113315375A (en) * | 2021-05-10 | 2021-08-27 | 江苏阿诗特能源科技有限公司 | Bidirectional BUCK-BOOST circuit and method based on battery charging and discharging |
| CN113300244A (en) * | 2021-06-15 | 2021-08-24 | 新兴铸管股份有限公司 | Protection device for protecting various microcomputers |
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