CN104345223B - A kind of 6KV voltage transformers and its secondary circuit are powered monitoring method - Google Patents
A kind of 6KV voltage transformers and its secondary circuit are powered monitoring method Download PDFInfo
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- CN104345223B CN104345223B CN201310322027.8A CN201310322027A CN104345223B CN 104345223 B CN104345223 B CN 104345223B CN 201310322027 A CN201310322027 A CN 201310322027A CN 104345223 B CN104345223 B CN 104345223B
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Abstract
The invention belongs to electrical testing technical field, and in particular to a kind of 6KV voltage transformers and its secondary circuit are powered monitoring method, are in turn included the following steps：In the safe I sections of bus of 6KV（5) a PT is respectively connected with safe I, II section of bus of 380V（8）, three PT are monitored respectively（8）Voltage, as 3 PT（8）Do not show abnormal low-voltage, judge to break as the safe I sections of bus of 6KV（5）Power supply is normal；When there is any abnormal low-voltage of 1 display, that is, it is judged as, with dead electricity risk, starting No. 1 EDG（2）, but transmit messages alert and handled；When having any 2 or all abnormal low-voltage of display, that is, it is judged as dead electricity, cuts off the external power of its connection（1）, start No. 1 EDG（2）And send alarm.The beneficial effect of technical solution of the present invention is：Logic rules according to the method described above judge, can greatly improve system reliability.
Description
Technical field
The invention belongs to electrical testing technical field, and in particular to a kind of 6KV voltage transformers and its secondary circuit are powered
Monitoring method.
Background technology
300,000 kilowatts of nuclear power generating sets of Up for Qinshan Nuclear Power Plant be China's Mainland First paddle one's own canoe strength research, design, build
With the nuclear power station of management, research and design, which is worked in, to be started the seventies in last century.Wherein nuclear island 6KV nuclear safe levels Medium voltage power supply system
Powered using binary channels, safe I, II section of bus of respectively 6KV corresponds to physically-isolated A, channel B, opening heap, power respectively
Operation, shutdown, reload and the operating mode such as meet an urgent need under, provide power supply for the security system and visual plant of nuclear island.Above-mentioned two sections of buses
It is provided with three diesel emergency generating sets（Hereinafter referred to as " EDG "）It is used as emergency power supply.No. 1 EDG answers urgent telegram as A channel
Source；No. 3 EDG are used as channel B emergency power supply；No. 2 EDG can both replace No. 1 EDG in A as No. 1 EDG and No. 3 EDG substitute
Passage is met an urgent need, and No. 3 EDG can be replaced emergent in channel B again.In A channel, 6KV is safe, and I sections of bus is given by step-down transformer
Safe I, II section of bussed supply of 380V；In channel B, the safe II sections of bus of 6KV by step-down transformer to 380V safety III, IV section
Bussed supply.
In the prior art, it is connected to a voltage transformer on every 6KV and 380V bus（Hereinafter referred to as " PT "）
For detecting busbar voltage, to judge whether bussed supply is normal.When the PT of safe I, II section of bus connections of 6KV shows that voltage is different
Chang Shi, will start corresponding EDG is safe I, II section of bussed supply of 6KV；When the PT of certain section of 380V essential supplies bus connection shows electricity
When reduce off-flavor is normal, it will be powered using another section of 380V essential supplies bus of same passage.
The PT that existing safe I, II section of bus of 6KV is used is pressed by three single-phase potential transformersConnection is constituted, and is become
Than forHigh-pressure side is per mutually concatenation 0.5A high-tension fuses, neutral-point solid ground；Low-pressure side is by Y
Shape winding andShape winding is constituted, and the B phases of Y shape winding are grounded, and neutral point is grounded through breakdown fuse,Shape winding one end is direct
Ground connection.In use, judge that safe I, II section of bus of 6KV loses when abnormal low-voltage occurs in the two-phase in PT three-phase
Electricity.However, repeatedly causing in actual motion because external factor triggers voltage transformer resonance so as to the high-tension fuse that fuses
There is abnormal low-voltage in one PT two-phase, and hair bus dead electricity is believed by mistake in the case of safe I, II section of bus normal power supply of 6KV
Number, so as to cause extremely serious run case.
The content of the invention
The present invention easily triggers voltage transformer resonance fusing high-tension fuse for prior art, so as to cause to send out female by mistake
The technical problem of line dead electricity signal is powered monitoring method there is provided a kind of new 6KV voltage transformers and its secondary circuit, is passed through
Introduce 380V buses PT monitoring result, form three PT compound detection, thus judge 6KV buses whether dead electricity, improve prison
Survey accuracy.
Technical scheme is as described below：
A kind of 6KV essential supplies bus voltage transformer and its secondary circuit are powered monitoring method, are in turn included the following steps：
A PT is connected on the safe I sections of bus of step 1,6KV；
Step 2, safe I, II section of bus of 380V respectively connection one PT；
Step 3, the voltage for monitoring three PT respectively, logic judgment and operation are carried out by monitoring result according to the following rules：
3.1 do not show abnormal low-voltage as 3 PT, judge to break as the safe I sections of bussed supply of 6KV it is normal；
3.2 when there is any abnormal low-voltage of 1 display in 3 PT, that is, are judged as that the safe I sections of bus of 6KV has dead electricity wind
Danger, does not start No. 1 EDG, but transmit messages alert and handled；
3.3 when having any 2 or all abnormal low-voltage of display in 3 PT, that is, are judged as that the safe I sections of bus of 6KV loses
Electricity, cuts off the external power of its connection, starts No. 1 EDG and sends alarm；
Step 4, it will determine that result feeds back to reactor protection system（Hereinafter referred to as " RPS "）.
Further, increase concatenates a non-linear harmonic elimination resistance between PT high-pressure sides neutral point and ground.The concatenation
Non-linear harmonic elimination resistance be carbofrax material, can limit primary current in normal operation and single-phase earthing, make fuse
It is difficult fusing.
Further, PT high-pressure side uses the high-voltage fuse with fusing triggering device per the 0.5A high-tension fuses of mutually concatenation
Silk.So fuse failure when, PT locking dead electricity signals, it is possible to increase the accuracy and reliability of system.
In order to improve test accuracy, increase two-stage under-voltage protection setting on the basis of above-mentioned steps, by above-mentioned step
Rapid 3 replace with following steps：
Step 3, the voltage for monitoring three PT respectively, monitoring result is judged and operated according to the following rules：
3.1 do not show abnormal low-voltage as 3 PT, judge to break as the safe I sections of bussed supply of 6KV it is normal；
3.2 when there is any abnormal low-voltage of 1 display in 3 PT, that is, are judged as that 6KV essential supplies bus has dead electricity risk,
Do not start No. 1 EDG, but transmit messages alert and handled；
3.3 when whole in 3 PT or have any 2 displays voltage to be below the 70% of rated value,
3.3.1 it is consistently less than 70% to be delayed through 0.5 second, signals to No. 1 EDG and start；
3.3.2 it is consistently less than 70% to be delayed through 4 seconds, hair dead electricity signal is to reactor protection system, and RPS sends out sweep load immediately
Signal, cuts off the external power of its connection；
3.3.3 after No. 1 EDG, which starts, successfully to be powered for 6KV essential supplies bus, PT hairs have electric signal to open immediately to RPS, RPS
It is dynamic that the equipment cleared away is reloaded with load program；
3.4 when whole in 3 PT or have any 2 displays voltage to be below the 90% of rated value,
3.4.1 it is consistently less than 90% to be delayed through 60.5 seconds, repeat step 3.3.1；
3.4.2 it is consistently less than 90% to be delayed through 64 seconds, repeat step 3.3.2；
3.4.3 repeat step 3.3.3；
The situation of step 3.3 is defined as dead electricity in design, the situation of step 3.4 is defined as brown, i.e. voltage
It is unqualified.
The beneficial effect of technical solution of the present invention is：Using safe I, II section of bussed supply detections of 6KV during prior art
Reliability probability be 0.99.And the technical scheme of the present embodiment is used, logic rules according to the method described above judge, Ke Yi great
It is big to improve system dependability.
Brief description of the drawings
Fig. 1 is 6KV voltage transformers and its secondary circuit schematic diagram in the present invention.
In figure, 1- external powers, 2-1 EDG, 3-2 EDG, 4-3 EDG, 5-6KV is safe I sections, and 6-380V is safe I sections,
7-380V is safe II sections, 8-PT.
Embodiment
Power monitoring side to a kind of 6KV voltage transformers and its secondary circuit of the invention with reference to the accompanying drawings and examples
Method is illustrated.Because safe I, II section of bus of 6KV is powered monitoring method using identical, thus it is following only with the safe I of 6KV
It is described in detail exemplified by section bus, this method is equally applicable to the safe II sections of bus of 6KV.Applicant believes that the common skill in this area
Art personnel are fully able to realize that the safe II sections of bus of 6KV is supplied by the explanation of I sections of bussed supply monitoring method safe to 6KV below
Electro-detection.
To improve the reliability of system, the product that the existing equipment that the present embodiment is used is identified preferably through core level, to solve
The weak link and problem certainly found in probabilistic safety analysis.Existing Duo Jia switchgear planies have carried out core to its product on domestic market
Level identification, selected seismic spectrum can cover the most domestic nuclear power plant site including Up for Qinshan Nuclear Power Plant during identification.
Embodiment 1
Technical scheme is as described below：
A kind of 6KV essential supplies bus voltage transformer and its secondary circuit are powered monitoring method, are in turn included the following steps：
A PT8 is connected on the safe I sections of bus 5 of step 1,6KV；
Step 2, safe I, II section of bus of 380V respectively connection one PT8；
Step 3, the voltage for monitoring three PT8 respectively, logic judgment and operation are carried out by monitoring result according to the following rules：
3.1 do not show abnormal low-voltage as 3 PT8, judge to break and are powered normally as the safe I sections of bus 5 of 6KV；
3.2 when there is any abnormal low-voltage of 1 display in 3 PT8, that is, are judged as that the safe I sections of bus 5 of 6KV has dead electricity
Risk, does not start No. 1 EDG, but transmit messages alert and handled；
3.3 when having any 2 or all abnormal low-voltage of display in 3 PT8, that is, are judged as that the safe I sections of bus 5 of 6KV loses
Electricity, cuts off the external power 1 of its connection, starts No. 1 EDG2 and sends alarm；
Step 4, it will determine that result feeds back to reactor protection system（Hereinafter referred to as " RPS "）.
In the present embodiment, PT8 high-pressure side uses the height with fusing triggering device per the 0.5A high-tension fuses of mutually concatenation
Press fuse.So fuse failure when, PT8 locking dead electricity signals, it is possible to increase the accuracy and reliability of system.
PT8 can be selected with being pressed in the prior art by three single-phase potential transformersThe PT8 of connection composition is identical
Equipment or other can meet technical solution of the present invention implement require existing equipment.It is possible to further PT8 to three lists
The connected mode of phase voltage transformer is improved.Increase concatenates one and non-linear disappeared between PT8 high-pressure sides neutral point and ground
Humorous resistance.The non-linear harmonic elimination resistance of the concatenation is carbofrax material, and one can be limited in normal operation and single-phase earthing
Primary current, makes fuse be difficult fusing.
Safe I, II section of bus of the existing 6KV of Qinshan nuclear power plant and its load equipment, recent two decades since being put into operation from nineteen ninety,
There is not big accident in overall operation, but because bus PT failures, and PT designs are unreasonable, there occurs the event of being run multiple times.
Using the technical scheme of the present embodiment, logic rules according to the method described above are judged, it is possible to achieve after " two from three "
Reliability probability is greatly improved, can realize by reliability from " hundred have a mistake " before " two from three " to " two from three " after
" perfectly safe ", embody technical solution of the present invention has the substantive distinguishing features of protrusion and significantly technological progress really.According to
Above-mentioned technical proposal, Up for Qinshan Nuclear Power Plant is through State Bureau of Nuclear Safety（NNSA）Carry out design after approval and equipment purchase is manufactured, and in
The safe II sections of switch cubicle Overall Reconstruction of 6KV is implemented during 2009 the 11st time refueling outage, is reloaded in 2010 the 12nd time big
The safe I sections of switch cubicle Overall Reconstruction of 6KV is implemented during repairing.Retrofit work is implemented under NNSA supervision, by complete
Kind debugging and experiment has carried out comprehensive verification to the function and performance of reforming equipment, confirms all to meet design requirement.This hair
Bright technical scheme embodies important function and huge economic value in China's npp safety running.
Embodiment 2
In order to improve test accuracy, increase two-stage under-voltage protection setting on the basis of embodiment 1.
The technical scheme that the present embodiment is used in turn includes the following steps：
A PT8 is connected on the safe I sections of bus 5 of step 1,6KV；
Step 2, in safe I, II section of bus of 380V a PT8 is connected respectively；
Step 3, the voltage for monitoring three PT8 respectively, monitoring result is judged and operated according to the following rules：
3.1 do not show abnormal low-voltage as 3 PT8, judge to break and are powered normally as the safe I sections of bus 5 of 6KV；
3.2 when there is any abnormal low-voltage of 1 display in 3 PT8, that is, are judged as that 6KV essential supplies bus 5 has dead electricity wind
Danger, does not start No. 1 EDG2, but transmit messages alert and handled；
3.3 when whole in 3 PT8 or have any 2 displays voltage to be below the 70% of rated value,
3.3.1 it is consistently less than 70% to be delayed through 0.5 second, signals to No. 1 EDG2 and start；
3.3.2 it is consistently less than 70% to be delayed through 4 seconds, hair dead electricity signal is to reactor protection system, and RPS sends out sweep load immediately
Signal, cuts off the external power 1 of its connection；
3.3.3 after No. 1 EDG, which starts 2, successfully to be powered for the safe I sections of bus 5 of 6KV, PT8 hairs have electric signal to RPS, RPS
Start the equipment reloaded and cleared away with load program immediately；
3.4 when whole in 3 PT8 or have any 2 displays voltage to be below the 90% of rated value,
3.4.1 it is consistently less than 90% to be delayed through 60.5 seconds, repeat step 3.3.1；
3.4.2 it is consistently less than 90% to be delayed through 64 seconds, repeat step 3.3.2；
3.4.3 repeat step 3.3.3；
Step 4, it will determine that result feeds back to reactor protection system.
The situation of step 3.3 is defined as dead electricity in design, the situation of step 3.4 is defined as brown, i.e. voltage
It is unqualified.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.It is if these modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then of the invention
It is also intended to comprising including these changes and modification.
Claims (4)
- The monitoring method 1. a kind of 6KV essential supplies bus voltage transformer and its secondary circuit are powered, in turn includes the following steps：A PT (8) is connected on the safe I sections of bus (5) of step 1,6KV；Step 2,380V safe I sections (6) and 380V safe II sections (7) respectively connection one PT；Step 3, the voltage for monitoring three PT (8) respectively, logic judgment and operation are carried out by monitoring result according to the following rules：Step 3.1 does not show abnormal low-voltage when 3 PT (8), judges to break as safe I sections of bus (5) power supplies of 6KV normally；Step 3.2 is judged as that the safe I sections of bus (5) of 6KV has when there is any abnormal low-voltage of 1 display in 3 PT (8) Dead electricity risk, does not start No. 1 EDG (2), but transmit messages alert and handled；Step 3.3 is judged as the safe I sections of bus of 6KV when having any 2 or all abnormal low-voltage of display in 3 PT (8) (5) dead electricity, cuts off the external power (1) of its connection, starts No. 1 EDG (2) and sends alarm；When whole in 3 PT (8) or when thering is any 2 displays voltage to be below the 70% of rated value, following operate is carried out:3.3.1 it is consistently less than 70% to be delayed through 0.5 second, signals to No. 1 EDG (2) and start；3.3.2 it is consistently less than 70% to be delayed through 4 seconds, hair dead electricity signal is to reactor protection system, and RPS is sent out immediately sweeps load letter Number, cut off the external power (1) of its connection；3.3.3 after No. 1 EDG (2), which starts, successfully to be powered for 6KV essential supplies bus, PT (8) hairs have electric signal to RPS, and RPS is immediately Start the equipment reloaded and cleared away with load program；3.4 when whole in 3 PT (8) or have any 2 displays voltage to be below the 90% of rated value,3.4.1 it is consistently less than 90% to be delayed through 60.5 seconds, repeat step 3.3.1；3.4.2 it is consistently less than 90% to be delayed through 64 seconds, repeat step 3.3.2；3.4.3 repeat step 3.3.3；Step 4, it will determine that result feeds back to reactor protection system.
- Monitoring method, its feature 2. a kind of 6KV essential supplies bus voltage transformer and its secondary circuit in such as claim 1 are powered It is：The PT (8) increases the non-linear harmonic elimination resistance connected between high-pressure side neutral point and ground.
- Monitoring method, its feature 3. a kind of 6KV essential supplies bus voltage transformer and its secondary circuit in such as claim 2 are powered It is：The non-linear harmonic elimination resistance of the concatenation is carbofrax material.
- Monitoring method, its feature 4. a kind of 6KV essential supplies bus voltage transformer and its secondary circuit in such as claim 2 are powered It is：The high-pressure side of the PT (8) uses the high voltage fuse with fusing triggering device per the 0.5A high-tension fuses of mutually concatenation.
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| CN1395106A (en) * | 2001-07-07 | 2003-02-05 | 余永宽 | High, low voltage electric energy metering device for automatically controlling current transformer ratio conversion |
| CN1457123A (en) * | 2003-05-08 | 2003-11-19 | 沈阳工业学院 | Intelligent distributing and transforming devices |
| CN201113799Y (en) * | 2007-09-25 | 2008-09-10 | 宝山钢铁股份有限公司 | Combination type direct current voltage adjusting apparatus |
| CN102253292B (en) * | 2011-05-20 | 2013-04-10 | 重庆市电力公司电力科学研究院 | RTDS-based platform and method for function test of circuit protective relaying device |
| CN102185289B (en) * | 2011-05-25 | 2013-07-24 | 重庆新世纪电气有限公司 | Bus coupler charging protection method and system |
| CN102565592B (en) * | 2012-01-18 | 2015-09-30 | 绍兴电力局 | A kind of technology-systematization verification short-circuit test method for intelligent substation |
| CN102621417B (en) * | 2012-03-26 | 2014-08-06 | 中铁八局集团电务工程有限公司 | Method for testing automatic throw-in equipment of emergency power supply |
| CN202583422U (en) * | 2012-04-09 | 2012-12-05 | 中科华核电技术研究院有限公司 | Nuclear power plant emergency diesel generator set on-line verification device |
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