CN106409088A - High-voltage electrical equipment over current protection training system and training method thereof - Google Patents
High-voltage electrical equipment over current protection training system and training method thereof Download PDFInfo
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- CN106409088A CN106409088A CN201610979249.0A CN201610979249A CN106409088A CN 106409088 A CN106409088 A CN 106409088A CN 201610979249 A CN201610979249 A CN 201610979249A CN 106409088 A CN106409088 A CN 106409088A
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Abstract
The invention discloses a high-voltage electrical equipment over current protection training system and a training method thereof. The training system is composed of an action current generation device and multiple over current protection system devices, wherein the action current generation device is composed of an adjustable transformer and a multi-gear step-down transformer for generating over current signals needed during the training process; and the multiple current protection system devices contains five current protection modes such as common over current instantaneous trip protection. In the case of training, different current protection systems can be selected according to different training needs for combined use, current coils of different current protection systems are serially connected to form an over current comprehensive protection system, and the action current generation device adjusts the magnitude of the input current and the change time and analyzes influences on the over current comprehensive protection system by different input current features. The system and the method of the invention are simple and easy to operate, the operation features of each current protection system can be displayed intuitively, the contact between systems is displayed, and good teaching and training effects can be effectively obtained.
Description
Technical field
The present invention relates to a kind of electrical practice training system and its practical training method, particularly a kind of secondary for high-voltage fence training
Loop relay protection training system and its practical training method, specifically a kind of high voltage electric equipment overcurrent protection experience system
And its practical training method.
Background technology
Secondary circuit is the important guarantee of electric power system safe and stable operation, particularly over-current protection system, its operation
The situation direct reaction running status of electrical network, the hysteresis quality being updated due to power circuit, being continuously increased with line load,
After supply line's operation a period of time, the rate of breakdown more and more higher such as overload flow, is familiar with overcurrent protection relevant knowledge, ripe
Composition structure, operation logic and the Maintenance and Repair technical ability of practicing grasp Over Current Protection System are the basic skill of electric grid operating personnel.
The abstractness run due to over-current protection system, particularly three-step charging etc. is during teaching, training
Often rest on theory analysis, in practice, major part still adopts visual illustration and single over-current protection system instruction
The mode practiced, does not reach the complete demonstration of combination current protection system, and dangerous big, and real training high cost, in real training process
In the mutual relation of different overcurrent protections and effect are difficult to represent, teaching efficiency is not good.
Content of the invention
The purpose of the present invention is for current electrician, particularly over-current protection system real training in high pressure electrician training process
System lacks, the poor problem of systemic integrity, invents a kind of experience system of efficient comprehensive safety and its practical training method.
The technical scheme is that：
A kind of high voltage electric equipment overcurrent protection experience system, is characterized in that by action current generator and multiple overcurrent
Protection system device is constituted, and described action current generator is made up of adjustable transformer Y1 and many gear step-down transformer Y2,
For the overcurrent signal needing during producing real training；Adjustable transformer Y1 produces the alternating current of any voltage value by knob
Pressure；Many gear step-down transformer Y2 realize the current coil of each over-current protection system electric current relay being powered, according to selected
The difference of over-current protection system type and quantity, adjustable current size IinIt is change, Y2 is many, and gear can ensure that various
In the case of can provide sizeable electric current for test use；Described multiple current protection system devices include：Speed
Disconnected protection system, specified time fast tripping protection system, specified time Over Current Protection System, inverse-time overcurrent protection system and digital
Over Current Protection System；In use according to different training requirements, different current protection system are selected to be combined making
With being powered by keeping off step-down transformer Y2 after the series connection of the current coil of different current protection system, by the blood pressure lowering of many gears more
Transformator Y1 carries out input current adjustment.
Described fast tripping protection system is made up of overcurrent relay I, signal relay I and red green display lamp, green instruction
Lamp represents that system does not occur action, and red led represents system generation action, the action current of setting electric current relay I
I1, after trigger current relay I, signal relay I sends signal, and green indicating lamp extinguishes, and red led works, show be
System has started to；Described specified time fast tripping protection system is by overcurrent relay II, time relay II, signal relay
II and red green display lamp are constituted, and green indicating lamp represents that system does not occur action, and red led represents system generation action,
The action current I of setting electric current relay II2T movement time with time relay II2, after trigger current relay II through
t2After time, signal relay II sends signal, and green indicating lamp extinguishes, and red led works, and shows that system has begun to work
Make；Described specified time Over Current Protection System is by overcurrent relay III, the time relay III, signal relay III and red green instruction
Lamp is constituted, and green indicating lamp represents that system does not occur action, and red led represents system generation action, setting electric current relay
The action current I of device III3T movement time with the time relay III3, through t after trigger current relay III3Time signal continues
Electrical equipment III sends signal, and green indicating lamp extinguishes, and red led works, and shows that system has started to；Described inverse time
Limit Over Current Protection System is made up of Countertime limiting overcurrent relay IV, signal relay IV and red green display lamp, green indicating lamp table
Show that system does not occur action, red led represents system generation action, set the action current of Countertime limiting overcurrent relay
I4, after triggering Countertime limiting overcurrent relay, signal relay IV sends signal, and green indicating lamp extinguishes, and red led works,
Show that system has started to；Described digital Over Current Protection System is by digital overcurrent relay V and red green display lamp
Constitute, green indicating lamp represents that system does not occur action, red led represents system generation action, set digital excessively stream
The action current I of relay V5, after triggering digital overcurrent relay V, logical process is by digital overcurrent relay V itself
Portion is carried out, and digital overcurrent relay V output switch controls green indicating lamp to extinguish, and red led works, and shows system
Through starting working.
The two of technical scheme are：
A kind of high voltage electric equipment overcurrent protection practical training method is it is characterised in that it comprises the steps：
（1）According to different training requirements, the over-current protection system selected required for determining；
（2）Opening and closing by short switch, selects corresponding over-current protection system, each over-current protection system electric current
Coil is connected, and forms overcurrent Integrated Protection System；
（3）According to real training demand, set electric current working value and parameter movement time of each over-current protection system；
（4）Input current size and transformation period are adjusted by action current generator；
（5）The different impact to overcurrent Integrated Protection System for the input current characteristics of analysis.
The invention has the beneficial effects as follows：
The present invention is simple, easy, can intuitively show the operation characteristic of various current protection system, shows the connection between each system
System, can effectively obtain good teaching result.
Brief description
Fig. 1 is the overcurrent protection comprehensive training system schematic diagram of the present invention.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment one.
As shown in Figure 1.
A kind of high voltage electric equipment overcurrent protection experience system, it is by action current generator and multiple over current protection
Protecting system device is constituted, and described action current generator is made up of adjustable transformer Y1 and many gear step-down transformer Y2, uses
The overcurrent signal needing during producing real training；Adjustable transformer Y1 produces the alternating current of any voltage value by knob
Pressure；Many gear step-down transformer Y2 realize the current coil of each over-current protection system electric current relay being powered, according to selected
The difference of over-current protection system type and quantity, adjustable current size IinIt is change, Y2 is many, and gear can ensure that various
In the case of can provide sizeable electric current for test use；Described multiple current protection system devices include mutually
The connected overcurrent fast tripping protection system of concatenation, specified time fast tripping protection system, specified time Over Current Protection System, inverse-time overcurrent
Protection system and digital Over Current Protection System；Overcurrent fast tripping protection system, specified time fast tripping protection system, definited time-lag
Overcurrent relay two ends in stream protection system, inverse-time overcurrent protection system and digital Over Current Protection System are all parallel with
Short switch is in order to carry out experimental selection；In use according to different training requirements, by opening or closing short circuit
Switch, may be selected different current protection system and is combined using, after the current coil of different current protection system is connected
It is powered by keeping off step-down transformer Y2 more, carry out input current adjustment by many gear step-down transformer Y1.Described quick-break is protected
Protecting system is made up of overcurrent relay I, signal relay I, short switch and red green display lamp, and green indicating lamp represents that system does not have
There is generation action, red led represents system generation action, the action current I of setting electric current relay I1, trigger current continues
After electrical equipment I, signal relay I sends signal, and green indicating lamp extinguishes, and red led works, and shows that system has begun to work
Make；Described specified time fast tripping protection system is by overcurrent relay II, short switch, time relay II, signal relay II
Constitute with red green display lamp, green indicating lamp represents that system does not occur action, and red led represents system generation action, if
Determine the action current I of electric current relay II2T movement time with time relay II2, through t after trigger current relay II2
After time, signal relay II sends signal, and green indicating lamp extinguishes, and red led works, and shows that system has begun to work
Make；Described specified time Over Current Protection System is by overcurrent relay III, short switch, the time relay III, signal relay III
Constitute with red green display lamp, green indicating lamp represents that system does not occur action, and red led represents system generation action, if
Determine the action current I of electric current relay III3T movement time with the time relay III3, through t after trigger current relay III3
Time signal relay III sends signal, and green indicating lamp extinguishes, and red led works, and shows that system has started to；
Described inverse-time overcurrent protection system is by Countertime limiting overcurrent relay IV, short switch, signal relay IV and red green instruction
Lamp is constituted, and green indicating lamp represents that system does not occur action, and red led represents system generation action, sets inverse time lag mistake
The action current I of current relay4, after triggering Countertime limiting overcurrent relay, signal relay IV sends signal, and green indicating lamp puts out
Go out, red led works, and shows that system has started to；Described digital Over Current Protection System is continued by digital excessively stream
Electrical equipment V, short switch and red green display lamp are constituted, and green indicating lamp represents that system does not occur action, and red led represents
System generation action, sets the action current I of digital overcurrent relay V5, at logic after the digital overcurrent relay V of triggering
Reason digital overcurrent relay V therein is carried out, and digital overcurrent relay V output switch controls green indicating lamp to put out
Go out, red led works, and shows that system has started to.
Embodiment two.
A kind of high voltage electric equipment overcurrent protection practical training method, it comprises the steps：
（1）According to different training requirements, the over-current protection system selected required for determining；
（2）Opening and closing by short switch, selects corresponding over-current protection system, each over-current protection system electric current
Coil is connected, and forms overcurrent Integrated Protection System；
（3）According to real training demand, set electric current working value and parameter movement time of each over-current protection system；
（4）Input current size and transformation period are adjusted by action current generator；
（5）The different impact to overcurrent Integrated Protection System for the input current characteristics of analysis.
Details are as follows：
The principle of overcurrent protection comprehensive practical traning platform of the present invention and structure composition are as shown in figure 1, in parallel in each transition relay
The short switch at device two ends accesses, to realize adjusting connecting, the overcurrent protection mode that protection system is run, in use, first
First set action current value and value movement time of each protection system, secondly input voltage, Jin Ergai are adjusted by adjustable transformer
Become the current value of the system that flows through, you can realize the analog demenstration of multiple current protection integrated operations.
During as carried out fast tripping protection and specified time overcurrent protection practice, by other three kinds of protection systems（Specified time quick-break is protected
Protecting system, inverse-time overcurrent protection system, digital Over Current Protection System）Short switch closure so that only fast tripping protection
With specified time overcurrent protection two systems work, now the current coil of overcurrent relay I and overcurrent relay III is connected on work
Make in loop, adjustment keeps off transformator gear so as to be at low voltage more, by the adjustment of adjustable transformer, you can realize
The regulation of test loop input current.
In order to effectively demonstrate the work process of each current protection system, test parameterss adjustment amplitude can be become big, adjustment speed
Disconnected protection act electric current I1For 3A, adjustment specified time overcurrent protection action current I3For 1.5A, movement time t3For 2s.By can
Voltage regulator/transformer adjustment galvanic areas are 0A ~ 1.5A, 1.5A ~ 3A, 3A three above scope, when input current size is 1A, this
When system work, and operating current is under two kinds of protection act current thresholds, neither generation action；Work as input current
During size 2A, for fast tripping protection system, current value be less than action current, system will not action, for specified time
For Over Current Protection System, now current value exceedes action current, and electric current relay III sends signal, if the persistent period does not reach
2S, then system still there is not action, if the time more than 2S, the time relay III action triggers signal relay III sends letter
Number so that display lamp changes, system display specified time Over Current Protection System generation action, fast tripping protection system does not occur
Action, for the fault of side circuit, the current value in circuit excessive it may be possible to because the reasons such as load excessive cause,
But it is not short-circuited or heavy overload phenomenon；After input current size is more than 2A, overcurrent relay I and excessively stream relay
Device III is above action current and sends signal, and now fast tripping protection system is transmitted rapidly after overcurrent relay 1 sends signal
To signal relay 1, system shows fast tripping protection system acting, cuts off operating circuit, now because signal relay I sends letter
Number speed be much larger than the time relay III set by current duration, therefore specified time Over Current Protection System do not send
Fault-signal, now system display fast tripping protection system generation action, immediate current is excessive it is possible that fault is the danger such as short circuit
The heavier fault of evil degree.
Multiple combination test can be carried out in the same manner, improve the power of starting of student, strengthen real experiences process, deepen study print
As.
From the foregoing, it will be observed that the present invention enables：
（1）Multiple current protection system are comprehensive, realize simulation and the demonstration of Over Current Protection System under lower pressure；
（2）Can be adjusted flexibly, show the mutual pass between the operation principle of different current protection system and each current protection system
System.
Part that the present invention does not relate to is all same as the prior art or can be realized using prior art.
Claims (3)
1. a kind of high voltage electric equipment overcurrent protection experience system, is characterized in that by action current generator and multiple excessively electric
Stream protection system device is constituted, and described action current generator is by adjustable transformer Y1 and many gear step-down transformer Y2 structures
Become, for the overcurrent signal needing during producing real training；Adjustable transformer Y1 produces the friendship of any voltage value by knob
Stream voltage；Many gear step-down transformer Y2 realize the current coil of each over-current protection system electric current relay being powered, according to institute
Select the difference of over-current protection system type and quantity, adjustable current size IinIt is change, Y2 is many, and gear can ensure that
Sizeable electric current can be provided in the case of various to use for test；Described multiple current protection system device bags
Include：Overcurrent fast tripping protection system, specified time fast tripping protection system, specified time Over Current Protection System, inverse-time overcurrent protection system
System and digital Over Current Protection System；In use according to different training requirements, select different current protection systems
System is combined using, and will be powered by keeping off step-down transformer Y2 after the series connection of the current coil of different current protection system more,
Carry out input current adjustment by many gear step-down transformer Y1.
2. high voltage electric equipment overcurrent protection experience system according to claim 1, is characterized in that described quick-break is protected
Protecting system is made up of overcurrent relay I, signal relay I and red green display lamp, and green indicating lamp represents that system is not moved
Make, red led represents system generation action, the action current I of setting electric current relay I1, believe after trigger current relay I
Number relay I sends signal, and green indicating lamp extinguishes, and red led works, and shows that system has started to；Described determines
Time limit fast tripping protection system is made up of overcurrent relay II, time relay II, signal relay II and red green display lamp, green
Display lamp represents that system does not occur action, and red led represents system generation action, the action of setting electric current relay II
Electric current I2T movement time with time relay II2, through t after trigger current relay II2After time, signal relay II sends out
Go out signal, green indicating lamp extinguishes, red led works, and shows that system has started to；Described specified time excessively stream is protected
Protecting system is made up of overcurrent relay III, the time relay III, signal relay III and red green display lamp, and green indicating lamp represents
There is not action in system, red led represents system generation action, the action current I of setting electric current relay III3And when
Between relay III t movement time3, through t after trigger current relay III3Time signal relay III sends signal, and green refers to
Show that lamp extinguishes, red led works, and shows that system has started to；Described inverse-time overcurrent protection system is by the inverse time lag
Overcurrent relay IV, signal relay IV and red green display lamp are constituted, and green indicating lamp represents that system does not occur action, red
Display lamp represents system generation action, sets the action current I of Countertime limiting overcurrent relay4, trigger Countertime limiting overcurrent relay
Signal relay IV sends signal afterwards, and green indicating lamp extinguishes, and red led works, and shows that system has started to；Institute
The digital overcurrent protection system stated is made up of digital overcurrent relay V and red green display lamp, and green indicating lamp represents that system does not have
There is generation action, red led represents system generation action, set the action current I of digital overcurrent relay V5, triggering
After digital overcurrent relay V, logical process is carried out by digital overcurrent relay V therein, digital overcurrent relay V
Output switch controls green indicating lamp to extinguish, and red led works, and shows that system has started to.
3. a kind of high voltage electric equipment overcurrent protection practical training method based on the experience system described in claim 1, its feature
It is that it comprises the steps：
（1）According to different training requirements, the over-current protection system selected required for determining；
（2）Opening and closing by short switch, selects corresponding over-current protection system, each over-current protection system electric current
Coil is connected, and forms overcurrent Integrated Protection System；
（3）According to real training demand, set electric current working value and parameter movement time of each over-current protection system；
（4）Input current size and transformation period are adjusted by action current generator；
（5）The different impact to overcurrent Integrated Protection System for the input current characteristics of analysis.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610979249.0A CN106409088A (en) | 2016-11-08 | 2016-11-08 | High-voltage electrical equipment over current protection training system and training method thereof |
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| CN201610979249.0A CN106409088A (en) | 2016-11-08 | 2016-11-08 | High-voltage electrical equipment over current protection training system and training method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152725A (en) * | 2017-12-14 | 2018-06-12 | 国网宁夏电力有限公司电力科学研究院 | A kind of electric switch Interruption experimental rig |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10341527A (en) * | 1997-06-09 | 1998-12-22 | Mitsubishi Electric Corp | Transformer protective relay device |
| CN103578340A (en) * | 2012-07-18 | 2014-02-12 | 上海宝钢工业技术服务有限公司 | High voltage electric safety body feeling testing device |
| CN103809052A (en) * | 2012-11-14 | 2014-05-21 | 中国广东核电集团有限公司 | Dynamic simulation experiment system for supergrid power transmission line protection and charged function test method |
| CN105655979A (en) * | 2016-03-15 | 2016-06-08 | 厦门大学嘉庚学院 | Device capable of distinguishing overcurrent and overload protection action signals of high-voltage motor and method |
| CN106057005A (en) * | 2016-05-27 | 2016-10-26 | 山东建筑大学 | Building power supply and distribution teaching technology simulation training system |
-
2016
- 2016-11-08 CN CN201610979249.0A patent/CN106409088A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10341527A (en) * | 1997-06-09 | 1998-12-22 | Mitsubishi Electric Corp | Transformer protective relay device |
| CN103578340A (en) * | 2012-07-18 | 2014-02-12 | 上海宝钢工业技术服务有限公司 | High voltage electric safety body feeling testing device |
| CN103809052A (en) * | 2012-11-14 | 2014-05-21 | 中国广东核电集团有限公司 | Dynamic simulation experiment system for supergrid power transmission line protection and charged function test method |
| CN105655979A (en) * | 2016-03-15 | 2016-06-08 | 厦门大学嘉庚学院 | Device capable of distinguishing overcurrent and overload protection action signals of high-voltage motor and method |
| CN106057005A (en) * | 2016-05-27 | 2016-10-26 | 山东建筑大学 | Building power supply and distribution teaching technology simulation training system |
Non-Patent Citations (1)
| Title |
|---|
| 仉志华等: ""电力系统线路保护综合实验平台的开发"", 《实验室研究与探索》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152725A (en) * | 2017-12-14 | 2018-06-12 | 国网宁夏电力有限公司电力科学研究院 | A kind of electric switch Interruption experimental rig |
| CN108152725B (en) * | 2017-12-14 | 2020-12-15 | 国网宁夏电力有限公司电力科学研究院 | Electrical switch tripping performance test device |
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Application publication date: 20170215 |