CN104681109A - Water level measurement device and method for pressure container of nuclear power plant - Google Patents

Water level measurement device and method for pressure container of nuclear power plant Download PDF

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Publication number
CN104681109A
CN104681109A CN201510109057.XA CN201510109057A CN104681109A CN 104681109 A CN104681109 A CN 104681109A CN 201510109057 A CN201510109057 A CN 201510109057A CN 104681109 A CN104681109 A CN 104681109A
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China
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main pump
water level
power plant
nuclear power
signal
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CN104681109B (en
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张秀春
王振营
李红林
郑文波
付汝师
李敏
李超
王世超
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21CNUCLEAR REACTORS
    • G21C17/00Monitoring; Testing ; Maintaining
    • G21C17/02Devices or arrangements for monitoring coolant or moderator
    • G21C17/035Moderator- or coolant-level detecting devices
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention discloses a water level measurement device and a water level measurement method for a pressure container of a nuclear power plant and solves the technical problem of inaccuracy of the water level of the pressure container obtained by measurement calculation through the water level measurement device for the pressure container when an auxiliary contact signal of a main pump circuit breaker cannot accurately reflect the operation state of a main pump in the prior art. The water level measurement device comprises a main pump operation state acquisition unit (10), a pressure difference measurement unit (20) and a water level calculation unit (30), wherein the main pump operation state acquisition unit (10) is used for acquiring the actual operation state information of the main pump of the nuclear power plant; the pressure difference measurement unit (20) is used for measuring pressure difference associated with the water level calculation of the pressure container of the nuclear power plant based on the actual operation state information to acquire a pressure difference measurement signal; the water level calculation unit (30) is used for calculating to acquire a water level value of the pressure container based on the pressure difference measurement signal. The technical effects of acquiring an actual operation state of the main pump and accurately calculating the water level based on the actual operation state of the main pump are achieved.

Description

A kind of nuclear power plant pressure container water level measuring device and method
Technical field
The present invention relates to nuclear power plant's pressure container water level measuring technical field, particularly relate to a kind of nuclear power plant pressure container water level measuring device and method.
Background technology
In nuclear power plant, setting pressure vessel water level measuring arrangement is the requisite measure ensureing that npp safety runs.PWR nuclear power plant is generally by measuring the differential pressure of pressure vessel bottom and top, and to realize pressure container water level measuring, wherein, " water " in pressure vessel is " the primary Ioops cooling medium " that drive by primary Ioops main pump.Concrete, under main pump shut down condition, the differential pressure at pressure vessel bottom and top determines primarily of the differential static pressure of the cooling medium in pressure vessel, and under main pump running status, in pressure vessel, the Forcing traffic of cooling medium can add the larger dynamic loss in head of introducing, therefore, in order to meet the accuracy requirement of pressure container water level measuring, generally at pressure vessel bottom and top, multiple differential pressure transmitter is installed, to measure to obtain level measuring signal to the pressure reduction of pressure vessel bottom and top, and these differential pressure transmitters have narrow range, wide-range and reference three types, namely level measuring signal comprises narrow range, wide-range and reference difference pressure transmitter signal three kinds of signal types, in level measuring process, the running status of main pump is depended in the selection of narrow range and wide-range differential pressure transmitter signal, reference difference pressure transmitter is for eliminating the change of containment environment to the impact of measuring, selected narrow range or wide-range differential pressure transmitter signal calculate together with reference difference pressure transmitter signal, can obtain pressure container water level measuring value accurately.Usually multiple main pump is provided with in nuclear power plant's primary Ioops system, when all main pumps are in shut down condition, select narrow range differential pressure transmitter signal and reference difference pressure transmitter signal calculating pressure container water level (LVSL, Level of Vessel), and multiple main pump in any way combined running (in multiple main pump, namely at least there is a main pump be in running status) time, select corresponding wide-range differential pressure transmitter and reference difference pressure transmitter signal to calculate LVSL.
The auxiliary contact of the main pump condition main pump isolating switch of current nuclear power plant pressure container water level measuring signal characterize.Concrete, when detecting that the auxiliary contact of a certain main pump isolating switch are in closure state, then determine that the main pump corresponding with this main pump isolating switch is in running status; Maybe when detecting that the auxiliary contact of a certain main pump isolating switch are in off-state, then determine that the main pump corresponding with this main pump isolating switch is in shut down condition.But, some faults may cause the auxiliary contact signal of main pump isolating switch can not reflect the running status of main pump exactly, as the operating power power-off when main pump isolating switch, and when before power-off, the auxiliary contact of main pump isolating switch are in closure state, main pump isolating switch will be kept closed, and select wide-range differential pressure transmitter signal and reference difference pressure transmitter signal to calculate LVSL, but reality this operating power dead electricity also can cause simultaneously for main pump provide the upstream bus of electrical source of power to lose in voltage source, main pump is run out of steam power supply, namely now the virtual condition of main pump is stopped transport, its main pump condition characterized with main pump isolating switch does not conform to, cause selecting narrow range differential pressure transmitter signal to calculate LVSL, and the wide-range differential pressure transmitter signal that have selected of mistake calculates LVSL, the LVSL calculated finally is caused to be inaccurate.
That is, exist when the auxiliary contact signal of main pump isolating switch can not reflect the running status of main pump exactly in prior art, the inaccurate technical matters of pressure vessel water level that pressure container water level measuring measurement device calculates.
Summary of the invention
The present invention is directed to and to exist in prior art, when the auxiliary contact signal of main pump isolating switch can not reflect the running status of main pump exactly, the inaccurate technical matters of pressure vessel water level that pressure container water level measuring measurement device calculates, a kind of nuclear power plant pressure container water level measuring device and method is provided, achieve and obtain the actual motion state of main pump, and carry out the technique effect of water level calculating accurately based on the actual motion state of main pump.
On the one hand, embodiments provide a kind of nuclear power plant pressure container water level measuring device, comprising:
Main pump running status acquiring unit, for obtaining the actual motion status information of nuclear power plant's main pump;
Differential pressure measuring cell, measures for calculating relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level, to obtain differential pressure measurement signal;
Water level computing unit, for based on described differential pressure measurement signal, calculates the water level value obtaining described pressure vessel.
Optionally, be provided with main pump isolating switch in the current supply circuit of described main pump, described main pump running status acquiring unit comprises:
Auxiliary contact signal acquisition module, for obtaining the auxiliary contact signal of described main pump isolating switch;
Voltage low signal acquisition module, for obtaining the voltage low signal of described main pump place bus;
Actual motion status information determination module, for based on described auxiliary contact signal and described voltage low signal, determines the actual motion status information of described main pump.
Optionally, described voltage low signal acquisition module comprises:
First voltage low signal obtains submodule, for obtaining the low subsignal of the first voltage of described main pump place bus;
Second voltage low signal obtains submodule, for obtaining the low subsignal of the second voltage of described main pump place bus;
Wherein, the low subsignal of described first voltage and the low subsignal of described second voltage form described voltage low signal.
Optionally, described actual motion status information determination module comprises:
First actual motion status information determination submodule, for showing that when described auxiliary contact signal the auxiliary contact output of described main pump isolating switch is off state and described voltage low signal is invalid, or when described voltage low signal is effective, determining that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units is zero;
Second actual motion status information determination submodule, for showing that when described auxiliary contact signal the auxiliary contact of described main pump isolating switch export as closure state, and described voltage low signal invalid time, determine that the actual motion status information of described main pump characterizes nuclear power plant main pump and runs number of units and be more than or equal to 1.
Optionally, described differential pressure measuring cell comprises:
Narrow range differential pressure transmitter, during for characterizing nuclear power plant main pump in the actual motion status information of described main pump to run number of units being zero, measures calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtains narrow range differential pressure measurement signal;
Wide-range differential pressure transmitter, for characterize in the actual motion status information of described main pump nuclear power plant main pump run number of units be more than or equal to 1 time, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain wide-range differential pressure measurement signal.
Reference difference pressure transmitter, for when pressure container water level measuring, measures calculating relevant reference pressure reduction to nuclear power plant pressure vessel water level, and obtains with reference to differential pressure measurement signal.
Optionally, described water level computing unit comprises:
First water level computing module, when being zero for characterizing nuclear power plant's main pump operation number of units when described actual motion status information, choosing and based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal, calculates the water level value obtaining described pressure vessel;
Second water level computing module, for when described actual motion status information sign nuclear power plant main pump operation number of units is more than or equal to 1, choose and based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel.
On the other hand, the embodiment of the present invention additionally provides a kind of nuclear power plant pressure container water level measuring method, and described water level measurement method comprises step:
The actual motion status information of S1, acquisition nuclear power plant main pump;
S2, calculate relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level and measure, to obtain differential pressure measurement signal;
S3, based on described differential pressure measurement signal, calculate and obtain the water level value of described pressure vessel.
Optionally, be provided with main pump isolating switch in the current supply circuit of described main pump, described step S1 comprises:
S11, obtain the auxiliary contact signal of described main pump isolating switch;
S12, obtain the voltage low signal of described main pump place bus;
S13, based on described auxiliary contact signal and described voltage low signal, determine the actual motion status information of described main pump.
Optionally, described step S12 is specially:
Obtain the low subsignal of the first voltage and the low subsignal of the second voltage of described main pump place bus respectively; Wherein, the low subsignal of described first voltage and the low subsignal of described second voltage form described voltage low signal.
Optionally, described step S13 is specially:
When described auxiliary contact signal shows that the auxiliary contact output of described main pump isolating switch is off state and described voltage low signal is invalid, or when described voltage low signal is effective, determining that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units is zero; And
When described auxiliary contact signal shows that the auxiliary contact of described main pump isolating switch export as closure state, and when described voltage low signal is invalid, determine that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units and is more than or equal to 1.
Optionally, described step S2 is specially:
When the actual motion status information sign nuclear power plant main pump operation number of units of described main pump is zero, relevant pressure reduction is calculated to nuclear power plant's pressure vessel water level and measures, and obtain narrow range differential pressure measurement signal and reference differential pressure measurement signal; And
The actual motion status information of described main pump characterize nuclear power plant main pump run number of units be more than or equal to 1 time, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain wide-range differential pressure measurement signal and reference differential pressure measurement signal.
Optionally, described step S3 is specially:
When described actual motion status information sign nuclear power plant main pump operation number of units is zero, chooses and based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel; And
When described actual motion status information sign nuclear power plant main pump operation number of units is more than or equal to 1, chooses and based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel.
One or more technical schemes that the embodiment of the present invention provides, at least have following technique effect or advantage:
Due in embodiments of the present invention, nuclear power plant's pressure container water level measuring device comprises main pump running status acquiring unit, differential pressure measuring cell and water level computing unit; Concrete, when carrying out pressure container water level measuring, described level measurement device obtains the actual motion status information of nuclear power plant's main pump by main pump running status acquiring unit, calculate relevant pressure reduction based on the actual motion status information pair of described main pump to nuclear power plant pressure vessel water level to make differential pressure measuring cell to measure, to obtain differential pressure measurement signal, and then make water level computing unit based on described differential pressure measurement signal, calculate the water level value obtaining described pressure vessel; The auxiliary contact signal of main pump isolating switch to efficiently solve in prior art when can not reflect the running status of main pump exactly, the inaccurate technical matters of pressure vessel water level that pressure container water level measuring measurement device calculates, achieves the technique effect carrying out pressure container water level measuring accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structured flowchart of the first nuclear power plant's pressure container water level measuring device that Fig. 1 provides for the embodiment of the present invention;
The structured flowchart of the second nuclear power plant pressure container water level measuring device that Fig. 2 provides for the embodiment of the present invention;
The main pump auxiliary contacts of circuit breaker signal acquisition circuit schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The main pump voltage low signal acquisition cuicuit schematic diagram that Fig. 4 provides for the embodiment of the present invention;
The first nuclear power plant's pressure container water level measuring method flow diagram that Fig. 5 provides for the embodiment of the present invention;
The second nuclear power plant pressure container water level measuring method flow diagram that Fig. 6 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention is by providing a kind of nuclear power plant pressure container water level measuring device, solve the auxiliary contact signal when main pump isolating switch existed in prior art when can not reflect the running status of main pump exactly, the inaccurate technical matters of pressure vessel water level that pressure container water level measuring measurement device calculates, achieve and obtain the actual motion state of main pump, and carry out the technique effect of water level calculating accurately based on the actual motion state of main pump.
The technical scheme of the embodiment of the present invention is for solving the problems of the technologies described above, and general thought is as follows:
Embodiments provide a kind of nuclear power plant pressure container water level measuring device, comprising: main pump running status acquiring unit, for obtaining the actual motion status information of nuclear power plant's main pump; Differential pressure measuring cell, measures for calculating relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level, to obtain differential pressure measurement signal; Water level computing unit, for based on described differential pressure measurement signal, calculates the water level value obtaining described pressure vessel.
Visible, in embodiments of the present invention, when carrying out pressure container water level measuring, described level measurement device obtains the actual motion status information of nuclear power plant's main pump by main pump running status acquiring unit, calculate relevant pressure reduction based on the actual motion status information pair of described main pump to nuclear power plant pressure vessel water level to make differential pressure measuring cell to measure, to obtain differential pressure measurement signal, and then make water level computing unit based on described differential pressure measurement signal, calculate the water level value obtaining described pressure vessel; The auxiliary contact signal of main pump isolating switch to efficiently solve in prior art when can not reflect the running status of main pump exactly, the inaccurate technical matters of pressure vessel water level that pressure container water level measuring measurement device calculates, achieves the technique effect carrying out pressure container water level measuring accurately.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail, the specific features being to be understood that in the embodiment of the present invention and embodiment is the detailed description to technical scheme, instead of the restriction to technical scheme, when not conflicting, the technical characteristic in the embodiment of the present invention and embodiment can combine mutually.
Embodiment one
Please refer to Fig. 1, embodiments provide a kind of nuclear power plant pressure container water level measuring device, comprising: main pump running status acquiring unit 10, for obtaining the actual motion status information of nuclear power plant's main pump; Differential pressure measuring cell 20, measures for calculating relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level, to obtain differential pressure measurement signal; Water level computing unit 30, for based on described differential pressure measurement signal, calculates the water level value obtaining described pressure vessel.Wherein, the actual motion status information of described main pump can be the actual motion number of units of main pump.Concrete, in nuclear power plant's primary Ioops system, be provided with multiple stage main pump, as the design for current CPR1000 nuclear power plant, primary Ioops Operation system setting has three main pumps; Main pump running status acquiring unit 10 is connected with these main pumps, to obtain the running status of these main pumps and to determine the actual motion number of units of main pump in primary Ioops system.
At present, main pump isolating switch is set in the current supply circuit of main pump, under the operating mode of main pump power supply (comprising operating power and electrical source of power) non-dead electricity, correctly can be reflected the running status of main pump by main pump isolating switch.Concrete, main pump safety detecting system can detect the low low signal of main pump rotating speed, main pump bearing temperature signal, master-control room start and stop main pump signal, main pump shaft seal height high-leakage amount signal in real time, and when detecting that the one or more signals in these signals are effective, controlling main pump isolating switch and disconnecting to make main pump stop transport; That is, under the operating mode of non-dead electricity, main pump condition is characterized by the auxiliary contact of main pump isolating switch, and the auxiliary contact of main pump isolating switch and main contact action simultaneously, be used to indicate deciliter state of main contact.
In the embodiment of the present application, main pump isolating switch can be set in the current supply circuit of main pump equally, and using the auxiliary contact signal of main pump isolating switch as one of reference signal of the actual motion state of reflection nuclear power plant main pump.Please refer to Fig. 2, main pump running status acquiring unit 10 comprises: auxiliary contact signal acquisition module 101, for obtaining the auxiliary contact signal of described main pump isolating switch.Concrete, please refer to Fig. 3, in the closing circuit that main pump auxiliary contacts of circuit breaker K is connected on main pump isolating switch and sub-gate circuit, wherein, the loop that closing circuit is formed for circuit 1-1 ' and operating power both positive and negative polarity, the loop that sub-gate circuit is formed for circuit 2-2 ' and operating power both positive and negative polarity.In figure 3,001XR' is the auxiliary contact of relay 001XR in closing circuit, 001JA is the auxiliary normally closed contact in closing circuit, 001EA is the closing coil in closing circuit, 002EA' is the auxiliary contact of switching winding 002EA in closing circuit, switching winding 002EA is arranged in described sub-gate circuit, and 002XR' is the auxiliary contact of relay 002XR in sub-gate circuit, and 002JA is the auxiliary contact in sub-gate circuit; In addition, relay 001XR and 002XR does not draw in the other loop in figure 3.Under the power failure state of operating power, auxiliary contact 001XR' and 002XR' is in open mode, and auxiliary contact 001JA, 002JA and 002EA' are in closure state, and the power failure state of above-mentioned auxiliary contact is its original state.When operating power normal power supply and main pump breaker closing time, relay 001XR is charged, corresponding contact 001XR' closes, described closing circuit momentary connection, closing coil 001EA excitation, start circuit breaker operation mechanism, after isolating switch closes, going here and there in the isolating switch of closing circuit assists normally closed contact 001JA to open, disconnect closing circuit, sent by the signal controlling main pump auxiliary contacts of circuit breaker K closed, to make contact K be in closure state, now described auxiliary contact characterization main pump is in closure state simultaneously, when operating power normal power supply and main pump circuit breaker trip time, auxiliary contacts of circuit breaker 002JA original state in sub-gate circuit is closure state, relay 002XR is charged, corresponding contact 002XR' closes, sub-gate circuit momentary connection, switching winding 002EA excitation, the contact 002EA' that be positioned at closing circuit corresponding with coil 002EA opens, start circuit breaker operation mechanism, after isolating switch tripping, going here and there in the isolating switch of sub-gate circuit assists normally opened contact 002XR' to open, disconnect sub-gate circuit, the signal that control main pump auxiliary contacts of circuit breaker K opens is sent simultaneously, open mode is in make contact K, now described auxiliary contact characterization main pump is in shut down condition.
Further, incorporated by reference to Fig. 2 and Fig. 3, auxiliary contact signal acquisition module 101 is connected with the two ends of main pump auxiliary contacts of circuit breaker K, and obtains auxiliary contact signal when contact K is in closed or open mode, wherein, auxiliary contact K only characterizes the auxiliary contacts of circuit breaker of a main pump; In specific implementation process, each main pump in the multiple stage main pump of nuclear power plant is provided with isolating switch, and all main pump isolating switchs are all electrically connected with auxiliary contact signal acquisition module 101, auxiliary contact signal acquisition module 101 can obtain the auxiliary contact signal of the isolating switch of all main pumps.
Wherein, described auxiliary contacts of circuit breaker signal can from the running status reflecting the main pump be connected with this isolating switch on the one hand, consider that main pump isolating switch may due to dead electricity operating mode or faults itself, and the auxiliary contact signal of output error, the true running status of the main pump that reflection that namely can not be correct is coupled, further, still please refer to Fig. 2, main pump running status acquiring unit 10 also comprises: voltage low signal acquisition module 102, for obtaining the voltage low signal of described main pump place bus.
Concrete, still please refer to Fig. 2, voltage low signal acquisition module 102 comprises: the first voltage low signal obtains submodule 1021, for obtaining the low subsignal of the first voltage of described main pump place bus; Second voltage low signal obtains submodule 1022, for obtaining the low subsignal of the second voltage of described main pump place bus; Wherein, the low subsignal of described first voltage and the low subsignal of described second voltage form described voltage low signal.Concrete, please refer to Fig. 4, the observation circuit of monitoring main pump place busbar voltage low signal is provided with between main pump monitoring two poles, each main pump is provided with voltage low signal observation circuit, for the voltage low signal observation circuit of a main pump, two relay 003XR and 004XR are provided with in this observation circuit, and contact 001XU' and 002XU' corresponding with two voltage relay 001XU and 002XU respectively, wherein, voltage relay 001XU and 002XU is in other loop and do not draw in the diagram, the series arm 3-3 ' of contact 001XU' and relay 003XR is connected to monitor between two poles and forms a loop, the series arm 4-4 ' of contact 002XU' and relay 004XR is connected to monitor between two poles and forms another loop, and branch road 3-3 ' and 4-4 ' is in parallel, corresponding with relay 003XR and 004XR respectively contact 003XR' and 004XR' is in parallel and be electrically connected with voltage low signal acquisition module 102, when when contact, 003XR' and 004XR' triggers (as become open mode from closure state) simultaneously, the voltage low signal that voltage low signal acquisition module 102 monitors this main pump place bus is effective.For described main pump dead electricity; for the design of current CPR1000 nuclear power plant; when losing the operating power of main pump; meeting activating electrical protection act; main pump place busbar voltage is lost; when main pump place busbar voltage is low; voltage relay 001XU and 002XU dead electricity; corresponding contacts 001XU' and 002XU' closes; article two, loop (i.e. the loop at 003XU and 004XU place) is connected; relay 003XR and 004XR is charged, and contact 003XR' and 004XR' all opens, and " voltage low signal " comes into force.Namely the monitoring circuit of two-way parallel connection here (3-3 '), (4-4 ') and two corresponding with it contact 003XR', 004XR' in parallel embody two voltage low signal and obtain submodules 1021 and 1022, why two voltage low signal are set and obtain submodule, and only have when auxiliary contact (003XR' and the 004XR') signal of two parallel connections triggers "off" signal simultaneously, just determine that voltage low signal is effective, improve the reliability of obtained main pump voltage low signal.
Same, in specific implementation process, two main pump isolating switchs can be arranged in parallel in the feed circuit of a certain main pump, namely on the basis that a circuit breaker auxiliary contact input as shown in Figure 3 exports, increase by a road again to export, with former auxiliary contacts of circuit breaker signal output-parallel, and when only having auxiliary contacts of circuit breaker signal identical (as being all closed or same being off) when two parallel connections, then auxiliary contact signal acquisition module 101 determines that this main pump is closure state or off-state, improve the reliability that obtained auxiliary contacts of circuit breaker characterization main pump closes or disconnects, and, when wherein a circuit breaker is out of order, can not affect under the prerequisite that main pump normally runs, the equipment relevant to this auxiliary circuit breaker keeps in repair, and then do not affect the normal operation of unit.
Further, still please refer to Fig. 2, main pump running status acquiring unit 10 also comprises actual motion status information determination module 103, for obtaining described auxiliary contact signal and described voltage low signal from auxiliary contact signal acquisition module 101 and voltage low signal acquisition module 102 respectively, and based on described auxiliary contact signal and described voltage low signal, determine the actual motion status information of described main pump.
Further, still please refer to Fig. 2, actual motion status information determination module 103 comprises: the first actual motion status information determination submodule 1031, for showing that when described auxiliary contact signal the auxiliary contact output of described main pump isolating switch is off state and described voltage low signal is invalid, or when described voltage low signal is effective, determining that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units is zero; Second actual motion status information determination submodule 1032, for showing that when described auxiliary contact signal the auxiliary contact of described main pump isolating switch export as closure state, and described voltage low signal invalid time, determine that the actual motion status information of described main pump characterizes nuclear power plant main pump and runs number of units and be more than or equal to 1.That is, when main pump circuitbreaker control power supply normal power supply (i.e. the non-dead electricity of main pump), auxiliary contact signal primarily of the output of main pump isolating switch determines the running status of main pump, namely when described auxiliary contact signal is for time closed, determine that main pump normally runs, when described auxiliary contact signal is for opening, determine that main pump is stopped transport; When main pump dead electricity, voltage low signal primarily of main pump place bus determines the running status of main pump, namely when described voltage low signal is effective, no matter which kind of state described auxiliary contact signal is, all determine that main pump is stopped transport, achieve and be in closure state at main pump isolating switch due to dead electricity or other fault, and main pump power supply is actual when being dead electricity, the technique effect of the running status of correct projection main pump.
Then, please continue to refer to Fig. 2, in specific implementation process, differential pressure measuring cell 20 comprises: narrow range differential pressure transmitter 201, when being zero for characterizing nuclear power plant's main pump operation number of units in the actual motion status information of described main pump, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain narrow range differential pressure measurement signal; Wide-range differential pressure transmitter 202, for characterize in the actual motion status information of described main pump nuclear power plant main pump run number of units be more than or equal to 1 time, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain wide-range differential pressure measurement signal; Reference difference pressure transmitter 203, for when pressure container water level measuring, measures calculating relevant reference pressure reduction to nuclear power plant pressure vessel water level, and obtains with reference to differential pressure measurement signal; Described reference differential pressure measurement signal can eliminate the change of containment environment to the impact of measuring.In order to the differential pressure measurement signal of correct range can be selected, to measure the water level value of pressure vessel exactly, water level computing unit 30 also comprises: the first water level computing module 301, when being zero for characterizing nuclear power plant's main pump operation number of units when described actual motion status information, choose and based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel; Second water level computing module 302, for when described actual motion status information sign nuclear power plant main pump operation number of units is more than or equal to 1, choose and based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel.Wherein, " based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal; or based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel " with reference to existing relevant nuclear power technology, can not repeat here.
Generally speaking, in the embodiment of the present application, the main pump running status acquiring unit 10 of nuclear power plant's pressure container water level measuring device can obtain the actual motion status information of main pump, calculate relevant pressure reduction based on the actual motion status information pair of described main pump to nuclear power plant pressure vessel water level to make differential pressure measuring cell 20 to measure, to obtain differential pressure measurement signal, and then make water level computing unit 30 based on described differential pressure measurement signal, calculate the accurate water level value of pressure vessel.Wherein, main pump running status acquiring unit 10 comprises auxiliary contact signal acquisition module 101 and voltage low signal acquisition module 102, the auxiliary contact signal of the two main pump isolating switch obtained respectively comprehensive and voltage low signal, determine the actual motion status information of main pump, relative to prior art, few to intrinsic amendment, only need introduce main pump place bus voltage signal.Further, obtaining auxiliary contact signal or the voltage low signal of main pump isolating switch, two parallel detection loops are set, and when the detection output signal of two-way is identical, determine its reflection main pump closed/off-state or voltage low signal be with/without effect, the reliability that the reliability that improve obtained main pump voltage low signal and the auxiliary contacts of circuit breaker characterization main pump obtained close or disconnect, and, when wherein a circuit breaker is out of order, can not affect under the prerequisite that main pump normally runs, the equipment relevant to this auxiliary circuit breaker keeps in repair, and then do not affect the normal operation of unit.Further again, the differential pressure measurement signal selecting correct range can be ensured under the fault conditions such as dead electricity, obtain correct pressure vessel water level value to calculate, guarantee the correct diagnosis of operator to set state simultaneously.
Embodiment two
Based on same inventive concept, please refer to Fig. 5, the embodiment of the present invention additionally provides a kind of nuclear power plant pressure container water level measuring method, and described method comprises step:
The actual motion status information of S1, acquisition nuclear power plant main pump;
S2, calculate relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level and measure, to obtain differential pressure measurement signal;
S3, based on described differential pressure measurement signal, calculate and obtain the water level value of described pressure vessel.
In specific implementation process, be provided with main pump isolating switch, please refer to Fig. 6 in the current supply circuit of described main pump, described step S1 comprises:
S11, obtain the auxiliary contact signal of described main pump isolating switch;
S12, obtain the voltage low signal of described main pump place bus;
S13, based on described auxiliary contact signal and described voltage low signal, determine the actual motion status information of described main pump.
Concrete, described step S12 is specially: the low subsignal of the first voltage and the low subsignal of the second voltage that obtain described main pump place bus respectively; Wherein, the low subsignal of described first voltage and the low subsignal of described second voltage form described voltage low signal.
In addition, described step S13 is specially: when described auxiliary contact signal shows that the auxiliary contact output of described main pump isolating switch is off state and described voltage low signal is invalid, or when described voltage low signal is effective, determining that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units is zero; And when described auxiliary contact signal shows that the auxiliary contact of described main pump isolating switch export as closure state, and when described voltage low signal is invalid, determine that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units and is more than or equal to 1.
In specific implementation process, described step S2 is specially:
When the actual motion status information of described main pump characterizes nuclear power plant main pump to run number of units be zero, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain narrow range differential pressure measurement signal and reference differential pressure measurement signal; And
The actual motion status information of described main pump characterize nuclear power plant main pump run number of units be more than or equal to 1 time, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain wide-range differential pressure measurement signal and reference differential pressure measurement signal.
In specific implementation process, described step S3 is specially:
When described actual motion status information sign nuclear power plant main pump operation number of units is zero, chooses and based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel; And when described actual motion status information sign nuclear power plant main pump operation number of units is more than or equal to 1, chooses and based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel.
According to description above, above-mentioned nuclear power plant pressure container water level measuring method is applied in above-mentioned nuclear power plant pressure container water level measuring device, so the implementation process of the method is consistent with one or more embodiments of said apparatus, just repeat no longer one by one at this.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (12)

1. nuclear power plant's pressure container water level measuring device, is characterized in that, described level measurement device comprises:
Main pump running status acquiring unit (10), for obtaining the actual motion status information of nuclear power plant's main pump;
Differential pressure measuring cell (20), measures for calculating relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level, to obtain differential pressure measurement signal;
Water level computing unit (30), for based on described differential pressure measurement signal, calculates the water level value obtaining described pressure vessel.
2. level measurement device as claimed in claim 1, it is characterized in that, be provided with main pump isolating switch in the current supply circuit of described main pump, described main pump running status acquiring unit (10) comprising:
Auxiliary contact signal acquisition module (101), for obtaining the auxiliary contact signal of described main pump isolating switch;
Voltage low signal acquisition module (102), for obtaining the voltage low signal of described main pump place bus;
Actual motion status information determination module (103), for based on described auxiliary contact signal and described voltage low signal, determines the actual motion status information of described main pump.
3. level measurement device as claimed in claim 2, it is characterized in that, described voltage low signal acquisition module (102) comprising:
First voltage low signal obtains submodule (1021), for obtaining the low subsignal of the first voltage of described main pump place bus;
Second voltage low signal obtains submodule (1022), for obtaining the low subsignal of the second voltage of described main pump place bus;
Wherein, the low subsignal of described first voltage and the low subsignal of described second voltage form described voltage low signal.
4. level measurement device as claimed in claim 2, it is characterized in that, described actual motion status information determination module (103) comprising:
First actual motion status information determination submodule (1031), for showing that when described auxiliary contact signal the auxiliary contact output of described main pump isolating switch is off state and described voltage low signal is invalid, or when described voltage low signal is effective, determining that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units is zero;
Second actual motion status information determination submodule (1032), for showing that when described auxiliary contact signal the auxiliary contact of described main pump isolating switch export as closure state, and described voltage low signal invalid time, determine that the actual motion status information of described main pump characterizes nuclear power plant main pump and runs number of units and be more than or equal to 1.
5. the level measurement device as described in claim as arbitrary in Claims 1 to 4, is characterized in that, described differential pressure measuring cell (20) comprising:
Narrow range differential pressure transmitter (201), when being zero for characterizing nuclear power plant's main pump operation number of units in the actual motion status information of described main pump, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain narrow range differential pressure measurement signal;
Wide-range differential pressure transmitter (202), for when the actual motion status information sign nuclear power plant main pump operation number of units of described main pump is more than or equal to 1, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain wide-range differential pressure measurement signal.
Reference difference pressure transmitter (203), for when pressure container water level measuring, measures calculating relevant reference pressure reduction to nuclear power plant pressure vessel water level, and obtains with reference to differential pressure measurement signal.
6. level measurement device as claimed in claim 5, it is characterized in that, described water level computing unit (30) comprising:
First water level computing module (301), when being zero for characterizing nuclear power plant's main pump operation number of units when described actual motion status information, choose and based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel;
Second water level computing module (302), for when described actual motion status information sign nuclear power plant main pump operation number of units is more than or equal to 1, choose and based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel.
7. nuclear power plant's pressure container water level measuring method, is characterized in that, described water level measurement method comprises step:
The actual motion status information of S1, acquisition nuclear power plant main pump;
S2, calculate relevant pressure reduction based on described actual motion status information pair and nuclear power plant pressure vessel water level and measure, to obtain differential pressure measurement signal;
S3, based on described differential pressure measurement signal, calculate and obtain the water level value of described pressure vessel.
8. water level measurement method as claimed in claim 7, it is characterized in that, be provided with main pump isolating switch in the current supply circuit of described main pump, described step S1 comprises:
S11, obtain the auxiliary contact signal of described main pump isolating switch;
S12, obtain the voltage low signal of described main pump place bus;
S13, based on described auxiliary contact signal and described voltage low signal, determine the actual motion status information of described main pump.
9. water level measurement method as claimed in claim 8, it is characterized in that, described step S12 is specially:
Obtain the low subsignal of the first voltage and the low subsignal of the second voltage of described main pump place bus respectively; Wherein, the low subsignal of described first voltage and the low subsignal of described second voltage form described voltage low signal.
10. water level measurement method as claimed in claim 8, it is characterized in that, described step S13 is specially:
When described auxiliary contact signal shows that the auxiliary contact output of described main pump isolating switch is off state and described voltage low signal is invalid, or when described voltage low signal is effective, determining that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units is zero; And
When described auxiliary contact signal shows that the auxiliary contact of described main pump isolating switch export as closure state, and when described voltage low signal is invalid, determine that the actual motion status information of described main pump characterizes nuclear power plant's main pump operation number of units and is more than or equal to 1.
Water level measurement method as described in 11. claims as arbitrary in claim 7 ~ 10, it is characterized in that, described step S2 is specially:
When the actual motion status information of described main pump characterizes nuclear power plant main pump to run number of units be zero, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain narrow range differential pressure measurement signal and reference differential pressure measurement signal; And
The actual motion status information of described main pump characterize nuclear power plant main pump run number of units be more than or equal to 1 time, measure calculating relevant pressure reduction to nuclear power plant pressure vessel water level, and obtain wide-range differential pressure measurement signal and reference differential pressure measurement signal.
12. water level measurement methods as claimed in claim 11, it is characterized in that, described step S3 is specially:
When described actual motion status information sign nuclear power plant main pump operation number of units is zero, chooses and based on described narrow range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel; And
When described actual motion status information sign nuclear power plant main pump operation number of units is more than or equal to 1, chooses and based on described wide-range differential pressure measurement signal and described reference differential pressure measurement signal, calculate the water level value obtaining described pressure vessel.
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CN108448541A (en) * 2018-05-23 2018-08-24 广东电网有限责任公司 A kind of detecting system of the control loop of electric system disconnecting switch
CN110265160A (en) * 2019-06-19 2019-09-20 岭澳核电有限公司 Nuclear plant pressure vessels water level monitoring method and device
CN110277181A (en) * 2019-06-19 2019-09-24 岭澳核电有限公司 Nuclear plant pressure vessels water level monitoring method and device
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