CN206412780U - The off line energy metering switching device of large nuclear power station - Google Patents
The off line energy metering switching device of large nuclear power station Download PDFInfo
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- CN206412780U CN206412780U CN201720079334.1U CN201720079334U CN206412780U CN 206412780 U CN206412780 U CN 206412780U CN 201720079334 U CN201720079334 U CN 201720079334U CN 206412780 U CN206412780 U CN 206412780U
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Abstract
The utility model is related to a kind of off line energy metering switching device of nuclear power station, particularly a kind of off line energy metering switching device of large nuclear power station, include a plurality of generating set outlet breaker auxiliary contacts and plurality of high voltage power distribution equipment breaker auxiliary contact, its structural feature is, also include logic control switching device, the logic control device includes breaker auxiliary contact On-off signal loop, logic control element and switching output loop, wherein a plurality of generating set outlet breaker auxiliary contacts and plurality of high voltage power distribution equipment breaker auxiliary contact are respectively connected to breaker auxiliary contact On-off signal loop, switching output loop is connected to each unit energy metering voltage circuit.Advantage is：Switching circuit is simplified, the application of a large amount of control cables is reduced while reliability is guaranteed.
Description
Technical field
The utility model is related to a kind of off line energy metering switching device of nuclear power station, and particularly a kind of large nuclear power station is off line
Energy metering switching device.
Background technology
Large nuclear power station（Domestic main flow, install 1000MW and above unit before feeling the pulse with the finger-tip）Electric energy is being sent to power network（On
Net electricity）While, the equipment such as its generator excitation also needs to consume electricity consumption in electric energy, general factory and accounts for the 5 ~ 10% of its generated energy.Electricity
As long as there is a generating set generating in standing, there is the station service of the unit of electrical connection just to use with the unit on high voltage bus and be somebody's turn to do
Unit electricity energy；Conversely, one or the no unit generation of several units being such as connected with each other on high voltage bus, at this moment
The station service of nuclear power generating sets must just obtain the electric energy of power network, off line electricity of this electric energy nuclear power generating sets from high-voltage power line
Amount, correspondence stoichiometric point is called lower network metering critical point.For 1000MW and above nuclear power generating sets, lower network metering critical point is in the unit liter
Buckling high-pressure side.
Nuclear power station to power network need to pay the corresponding electricity charge by the power consumption at metering critical point.Due to the electric energy meter at metering critical point
Measure device（Electric energy meter）Cannot distinguish between station service is that or can use off line electricity with nuclear power station electricity itself, need to configure automatic throwing
Cutting apparatus makes a distinction.The device puts into critical point metering device when with off line electricity, is cut off during with nuclear power station oneself electricity
Metering device is not measured.All off line electricity of last metering device metering.
Current power plant and nuclear power station are typically auxiliary contact of breaker and relay by controlling cable by certain logic
Connection builds automatic switching loop：Its switching loop need to be using generating set outlet breaker, high voltage distribution installation breaker
Auxiliary contact, these contacts need to carry out the electrical connection of a variety of series, parallel in the loop.In conventional thermal power plant or machine
Group less than the nuclear power plant of 4, due between unit distance be not it is too remote, use control the cross-section of cable for 4 square millimeters and
During the above, pressure drop etc. needed for the control cable length needed for correspondence control switching analog logic loop can meet switching control substantially
It is required that.
But, for large nuclear power station（The nuclear power station currently built and planned such as Fujian Province）Scale at a specified future date is generally
6 1000MW fired power generating units, the switching circuit control cable built by above-mentioned principle will need very long（It is most long to be up to
7.5km）.So long control cable resistance is up to tens ohm, be pressure drop that loop is produced on cable reach 10% with
On, thus the driving to the actuating of relay will be influenceed, make to switch back the correct reliability reduction of action.It is one as shown in Figure 1
Large nuclear power station（6 1000MW units）Electrical main connecting wire, accompanying drawing 2 show the off line energy metering of the large nuclear power station after
The switching circuit diagram that electrical equipment is built.In figure, ZJ1 ~ ZJ6 is relay, and other is that GCB1 ~ GCB6 is 1#~6# generating sets
Outlet breaker auxiliary contact；5011~5063 be high voltage distribution installation breaker auxiliary contact；+ KM/-KM is control power supply.
It can be seen that from figure, such as 1# unit generations, 6# units do not generate electricity and by 5002 breakers in high voltage bus and #1
Unit is connected, then the locked loop of #6 units needs 6 breaker auxiliary such as GCE1 units, 5012,5013,5002,5062,5063
The series connection of contact.And it is in larger distance between large nuclear power station unit, above-mentioned power station 1# machines to #6 units cable duct are apart from nearly
3km.So, above-mentioned series loop is most long up to 8.8km（Other five open circuits of generator auxiliary contact cable core length 2x3km+
Device auxiliary contact cable core length 2x5x200m+ to Network Control Center 800m）.
The general of power plant secondary circuit uses DC220V or DC110V.Middle relay ZJ1 ~ ZJ6 resistance is general 300
Ohms.8.8km controls cable core（4 square millimeters）Nearly 37.84 ohm of resistance, its caused voltage is decrease beyond
10%.To so the regular event of relay be influenceed（Switch on or off）, so as to influence automatic switching loop stability and reliable
Property, it need to be improved.
The content of the invention
The purpose of this utility model is to provide one kind according in place of the deficiencies in the prior art and be able to ensure that automatic switching
Loop stability and the off line energy metering switching device of the large nuclear power station of reliability.
The purpose of this utility model is realized by following approach：
The off line energy metering switching device of large nuclear power station, includes a plurality of generating set outlet breaker auxiliary contacts
With plurality of high voltage power distribution equipment breaker auxiliary contact, its structural feature is, also includes logic control switching device, should
Logic control device includes breaker auxiliary contact On-off signal loop, logic control element and switching output loop, its
In a plurality of generating set outlet breaker auxiliary contacts and plurality of high voltage power distribution equipment breaker auxiliary contact be respectively connected to
Breaker auxiliary contact On-off signal loop, switching output loop is connected to each unit energy metering voltage circuit.
The utility model substitutes traditional relay using logic control switching device, so as to simplify switching circuit.Logic
Switching device is controlled with switching value of each breaker auxiliary contact directly as logic control element, logic control element then root
According to switching loop construction logic control unit of the prior art, it can be connect according to the generating set outlet breaker of reception auxiliary
Point on-off state, just can determine whether whether have generating set generating electricity in nuclear power station, such as On-off signal loop is received
The on-off model of a certain generating set outlet breaker auxiliary contact, represents the corresponding nuclear power generating sets of the contact in generating, if
Without On-off signal, then it represents that the nuclear power generating sets are in stopped status, it is necessary to which outside provide station service.Further matched somebody with somebody according to high pressure
The input state of electric installation breaker auxiliary contact：There is input switch amount to represent in position state is closed, without input switch amount then
It is expressed as off-state；According to existing switching loop logical relation judge shut down unit whether with nuclear power station other sending out
The unit of electricity has electrical connection, if generating set electricity then can be delivered to shutdown unit by connection, if do not connected,
Off line energy metering loop is switched to by switching output loop.Thus the off line critical point of large nuclear power station described in the utility model
Metering switching device effectively simplifies switching circuit, and automatic switchover output contact is realized by logic control switching device, realizes
Metering device voltage circuit input excision, so as to realize intelligent switching.The most long control cable of the device switching circuit only has
2km, the pressure drop that loop is produced on cable reduces a large amount of control cables below 2.5%, while reliability is guaranteed
Using.
The utility model can be specially further：
The logic control element is either a kind of loop control logic or is a kind of PLC.
Because logic control element is that the principle based on original switching loop is built, therefore can be in the form of loop
Embody, it would however also be possible to employ PLC.Described PLC is a kind of programmable controller of conventional commercial, only needs to use
The principle construction logic in original switching loop judges flow, just can realize logic control function described in the utility model, and should
The small volume of PLC controllers, it is simple to operate, it can further simplify switching circuit, improve the reliability of switching circuit.
In summary, the utility model provides a kind of off line energy metering switching device of large nuclear power station, effective letter
Change switching circuit, automatic switchover output contact is realized by logic control switching device, realize intelligence switching.The switching output
The most long control cable in loop only has 2km, and the pressure drop that loop is produced on cable is below 2.5%, and reliability is guaranteed, simultaneously
Also reduce the application of a large amount of control cables.
Brief description of the drawings
Fig. 1 is the electrical main connecting wire schematic diagram of large nuclear power station described in background technology；
The switching circuit diagram that Fig. 2 builds for the off line energy metering relay of large nuclear power station described in background technology；
Fig. 3 show the theory structure signal of the off line energy metering switching device of large nuclear power station shown in the utility model
Figure.
The utility model is described further with reference to embodiment.
Embodiment
Most preferred embodiment：
Referring to the drawings 3, the off line energy metering switching device of large nuclear power station includes a plurality of generating sets outlets open circuit
Device auxiliary contact and plurality of high voltage power distribution equipment breaker auxiliary contact, also include logic control switching device, the logic
Control device includes breaker auxiliary contact On-off signal loop, logic control element and switching output loop, wherein multiple
Several generating set outlet breaker auxiliary contacts and plurality of high voltage power distribution equipment breaker auxiliary contact are respectively connected to open circuit
Device auxiliary contact On-off signal loop, switching output loop is connected to each unit energy metering voltage circuit.It is wherein described
Logic control element is a kind of PLC.
The operation principle of the off line energy metering switching device of large nuclear power station is as follows, referring to accompanying drawing 3：
1st, each breaker auxiliary contact accesses PLC switching input module directly as switching value.
2nd, programmable controller (PLC) judges whether there is a generator in nuclear power station according to the on-off state of access
Group generates electricity.Auxiliary contact switching value such as GCE1 has input, represents that No. 1 nuclear power generating sets are generating electricity.
3rd, programmable controller (PLC) is according to the on-off state of access, interior certain generating set of intelligent decision nuclear power station
Shut down.Such as GCE6 auxiliary contact switching value represents that No. 6 nuclear power generating sets are in stopped status without input, needs outside offer station-service
Electricity.
4th, judge whether the unit with being generated electricity in nuclear power station has electrical connection to shutdown unit according to on-off state.With
Exemplified by No. 6 compressor emergency shutdowns, No. 6 units need to use station service.If No. 6 units are by breaker and No. 1 unit on high voltage bus
There are connection, i.e., 5011,5061 breakers while closing position while being in close position state or 5012,5013,5062,5063 breakers
State, then judge that No. 6 units shut down are connected with No. 1 unit on high voltage bus.
5th, if it is determined that there is connection, that is, unit is shut down（No. 6 machines）The generating set in station（No. 1 machine）Electricity energy（Figure
Show Y contacts）, now switch output loop cut-out（PLC output contacts disconnect）Measure the measurement loop of off line energy metering device
（Illustrate N contacts）.Conversely, it is such as connectionless, then off line energy metering loop is switched to, with the electricity of power network.
The utility model advantage is：1st, the reliability of the off line energy metering switching circuit of large nuclear power station is improved：Protect
As long as long as there is a generating set generating in card large nuclear power station power station, having electrical connection with the unit on high voltage bus
The station service of unit can just use the unit electricity energy, the metering of the off line energy metering device of now switching device cut-out metering
Loop；Conversely, be such as connected with each other on high voltage bus one or several units are without a unit generation, at this moment nuclear power generating sets
Station service the electric energy of power network is just obtained from high-voltage power line, now switching device connects the meter of the off line energy metering device of metering
Measure the electricity in loop, strictly according to the facts metering power network.2nd, a large amount of control cables are reduced and overall investment is reduced.According to statistics, using above-mentioned
After the switching device of logic control, above-mentioned scale nuclear power station can reduce control cable 12km.Comprehensive cost is cut than current relay
Changing device reduces by 20,000 yuan.
The not described part of the utility model is same as the prior art.
Claims (2)
1. the off line energy metering switching device of large nuclear power station, include a plurality of generating set outlet breaker auxiliary contacts and
Plurality of high voltage power distribution equipment breaker auxiliary contact, it is characterised in that also include logic control switching device, the logic control
Device processed includes breaker auxiliary contact On-off signal loop, logic control element and switching output loop, wherein plural number
Individual generating set outlet breaker auxiliary contact and plurality of high voltage power distribution equipment breaker auxiliary contact are respectively connected to breaker
Auxiliary contact On-off signal loop, switching output loop is connected to each unit energy metering voltage circuit.
2. the off line energy metering switching device of large nuclear power station according to claim 1, it is characterised in that the logic control
Unit processed is either a kind of loop control logic or is a kind of PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720079334.1U CN206412780U (en) | 2017-01-22 | 2017-01-22 | The off line energy metering switching device of large nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720079334.1U CN206412780U (en) | 2017-01-22 | 2017-01-22 | The off line energy metering switching device of large nuclear power station |
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| Publication Number | Publication Date |
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| CN206412780U true CN206412780U (en) | 2017-08-15 |
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| CN201720079334.1U Active CN206412780U (en) | 2017-01-22 | 2017-01-22 | The off line energy metering switching device of large nuclear power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785928A (en) * | 2017-09-19 | 2018-03-09 | 福建福清核电有限公司 | A kind of method for measuring multicomputer nuclear power station generated energy |
-
2017
- 2017-01-22 CN CN201720079334.1U patent/CN206412780U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785928A (en) * | 2017-09-19 | 2018-03-09 | 福建福清核电有限公司 | A kind of method for measuring multicomputer nuclear power station generated energy |
| CN107785928B (en) * | 2017-09-19 | 2019-10-22 | 福建福清核电有限公司 | A method of metering multicomputer nuclear power station generated energy |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 268 Patentee after: China Electric Power Construction Group Fujian electric survey and Design Institute Co., Ltd. Address before: 350003 Gulou District, Fujian, Fuzhou No. 54 Road, No. 268 Patentee before: Fujian Electric Power Survey and Design Institute |
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| CP01 | Change in the name or title of a patent holder |