CN110472316B - Channel switching design system, design method and device applied to nuclear power plant - Google Patents
Channel switching design system, design method and device applied to nuclear power plant Download PDFInfo
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- CN110472316B CN110472316B CN201910696121.7A CN201910696121A CN110472316B CN 110472316 B CN110472316 B CN 110472316B CN 201910696121 A CN201910696121 A CN 201910696121A CN 110472316 B CN110472316 B CN 110472316B
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- G—PHYSICS
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- G21C17/02—Devices or arrangements for monitoring coolant or moderator
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a channel switching design system, a channel switching design method and a channel switching design device applied to a nuclear power plant, and belongs to the technical field of calibration tests. The system comprises a channel mode determining module, a detecting module and a judging module, wherein the channel mode determining module is used for determining the number of test resistors and channel modes to be detected; a first design module, which designs a connecting line containing a plurality of channel switches between the lead and the resistance measuring instrument; the logic relationship determining module is used for determining a first logic relationship according to the conduction condition of the channel switch under each channel mode; and the second design module is used for designing a control circuit according to the first logic relation and realizing the switching of the channel mode through the control circuit. According to the invention, through designing the connecting circuit comprising a plurality of channel switches, the measurement of the test resistance of every two conducting wires is realized by controlling the on-off of the channel switches, so that the frequent disconnection and connection at the cabinet side are reduced; the cost input is little, easy operation, and the practicality is strong, can improve work efficiency and quality.
Description
Technical Field
The invention relates to the technical field of calibration tests, in particular to a channel switching design system, a channel switching design method and a channel switching design device applied to a nuclear power plant.
Background
A thermal resistance temperature probe (RTD) on a reactor coolant loop of a nuclear power plant is used for monitoring the temperature of a reactor coolant, the change of the coolant temperature can cause the change of reactivity, and a coolant temperature channel needs to be calibrated in order to ensure the safe and stable operation of a reactor; secondly, the temperature of the reactor coolant monitored by the RTD participates in the liquid level control of a voltage stabilizer, the steam turbine bypass steam discharge control, the rod position control of a control rod and the reactor protection control, so the RTD on the reactor coolant loop is one of important instrument control devices of the nuclear power station. The calibration of a reactor coolant temperature channel is required to be executed in a hot test, a pre-critical and power-on stage of the first start-up of a unit and a overhaul stage of shutdown and refueling, and the channel is calibrated by measuring the resistance value of the RTD, so that the temperature of the reactor coolant can be accurately measured and displayed.
A plurality of wires are generally connected to the thermal resistors on the reactor coolant loop, wherein two wires provide constant current to the thermal resistors, convert the resistors into voltage signals, and send the voltage signals to the DCS cabinet through other wires. In the process of a reactor temperature channel calibration test, the connection between the wires and the cabinet needs to be disconnected at the DCS cabinet side, and the test resistance between every two wires is detected in sequence through a resistance measuring instrument; however, when the test resistance between every two wires is detected, the wire to be detected needs to be manually replaced, and the wiring of the temperature probe is recovered after the measurement is completed, so that the measurement time is long. In addition, during the test, the disconnection and the connection are frequently carried out at the side of the cabinet, so that the connection terminal is easily abraded; and secondly, when the test resistance between every two leads is measured, the connection between the measured lead and the resistance measuring instrument needs to be frequently and manually replaced, the workload is large, the operation process is complicated, and the error is easy to cause.
Disclosure of Invention
The invention aims at the problems that in the prior art, each temperature platform needs to be frequently disconnected and wired on the side of a cabinet during the test period, and the wiring terminal is easily abraded; secondly, the connection between the measured lead and the resistance measuring instrument needs to be frequently and manually replaced for measuring the resistance between two lines of the temperature probe, the workload is large, the operation process is complicated, and human errors are easily caused.
In one aspect of the present invention, a channel switching design system applied to a nuclear power plant is provided, including:
the channel mode determining module is used for determining the number of the test resistors to be detected according to the number of the leads connected with the thermal resistor temperature probes; each test resistor corresponds to one channel mode;
a first design module, connected to the channel mode determination module, for designing a connection line including a plurality of channel switches between the wire and the resistance measuring instrument, so that each of the channel modes can be characterized by on or off of a different channel switch;
a logic relationship determination module, connected to the first design module, for determining a first logic relationship between the channel mode and the channel switch according to the conduction condition of the channel switch in each channel mode; and
and the second design module is connected with the logic relation determination module and is used for designing a control circuit according to the first logic relation so as to realize the switching of channel modes by controlling the on or off of the channel switches through the control circuit.
Further, the number of the leads is multiple, the test resistance is a resistance between every two leads, and each channel mode correspondingly detects one test resistance.
Further, the connection line including a plurality of the channel switches is: one end of each channel switch is connected with one lead, and the other end of each channel switch is connected with one input interface of the resistance measuring instrument.
Further, the logic relationship determining module is connected to the first designing module, and is configured to determine, respectively, a channel switch that needs to be turned on in each of the channel modes;
and determining a first logic relationship between each channel mode and the corresponding channel switch to be conducted according to the channel switch to be conducted.
Further, the second design module is connected to the logical relationship determination module, and is configured to design, according to the first logical relationship: a second logic relation of channel mode switching is realized through the conduction of one button; and designing a control circuit according to the second logic relation so as to realize the switching of the channel mode by controlling the on or off of the button through the control circuit.
In one aspect of the invention, a channel switching design method applied to a nuclear power plant comprises the following steps:
determining the number of test resistors to be detected according to the number of wires connected with the thermal resistor temperature probes; each test resistor corresponds to one channel mode;
designing a connection line comprising a plurality of channel switches between the conductor and the resistance measuring instrument, so that each channel mode can be characterized by the on or off of different channel switches;
determining a first logic relation between the channel mode and the channel switch according to the conduction condition of the channel switch under each channel mode;
and designing a control circuit according to the first logic relation so as to realize the switching of the channel modes by controlling the on or off of the channel switches through the control circuit.
Further, the number of the conducting wires is multiple, the test resistance is the resistance between every two conducting wires, and one test resistance is correspondingly detected in each channel mode.
Further, a connection line including a plurality of the channel switches is: one end of each channel switch is connected with one lead, and the other end of each channel switch is connected with one input interface of the resistance measuring instrument.
Further, designing a control circuit according to the first logic relationship, so as to control the on or off of the plurality of channel switches through the control circuit, and specifically implementing the switching of the channel modes as follows: designing according to the first logic relation: a second logic relation of channel mode switching is realized through the conduction of one button; and designing a control circuit according to the second logic relation so as to realize the switching of the channel mode by controlling the on or off of the button through the control circuit.
In another aspect of the present invention, a channel switching device applied to a nuclear power plant is provided, which is designed by using any one of the above channel switching design systems applied to a nuclear power plant.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
through designing a connecting circuit comprising a plurality of channel switches, the measurement of the test resistance of every two conducting wires is realized by controlling the on-off of the channel switches, so that the frequent disconnection and connection at the side of the cabinet are reduced; the cost investment is low, the operation is simple, the practicability is high, and the working efficiency and the quality can be improved; the method is suitable for the reactor coolant temperature channel calibration test during debugging or maintenance of the nuclear power plant.
Drawings
FIG. 1 is a block diagram of a channel switching design system provided in the present embodiment;
FIG. 2 is a schematic wiring diagram of a thermal resistance temperature probe;
FIG. 3 is a schematic wiring diagram of the channel switching design provided in this embodiment;
FIG. 4 is a schematic diagram of channel mode switching of the channel switching design provided in this embodiment;
FIG. 5 is a block diagram of a channel logic module of the channel switch design provided in this embodiment;
FIG. 6 is a schematic diagram of channel logic of the channel switch design provided in this embodiment;
FIG. 7 is a circuit diagram of a channel switching scheme provided in the present embodiment;
FIG. 8 is a circuit diagram of the channel mode switching logic of FIG. 7;
FIG. 9 is a circuit diagram of the driving circuit of FIG. 7;
fig. 10 is a circuit diagram of the power supply of fig. 7.
Detailed Description
In order to solve the problems that in the prior art, each temperature platform needs to be frequently disconnected and connected on the side of a cabinet during a test period, and a connection terminal is easily abraded; secondly, the connection between a measured lead and a resistance measuring instrument needs to be frequently and manually replaced for measuring the resistance between two lines of the temperature probe, the workload is large, the operation process is complicated, and human errors are easily caused. Through designing a connecting circuit comprising a plurality of channel switches, the measurement of the test resistance of every two conducting wires is realized by controlling the on-off of the channel switches, so that the frequent disconnection and connection at the side of the cabinet are reduced; the cost investment is low, the operation is simple, the practicability is high, and the working efficiency and the quality can be improved; the method is suitable for the reactor coolant temperature channel calibration test during debugging or maintenance of the nuclear power plant.
In a first embodiment, an embodiment of the present invention provides a system for designing channel switching applied to a nuclear power plant, and referring to fig. 1, the system includes:
the channel mode determining module 1 is used for determining the number of test resistors to be detected according to the number of wires connected with the thermal resistor temperature probes; each test resistor corresponds to one channel mode;
a first designing module 2, connected to the channel mode determining module 1, for designing a connection line including a plurality of channel switches between the wire and the resistance measuring instrument, so that each channel mode can be characterized by turning on or off a different channel switch;
a logic relationship determining module 3, connected to the first design module 2, for determining a first logic relationship between the channel mode and the channel switch according to the conduction condition of the channel switch in each channel mode; and
and the second design module 4 is connected with the logic relationship determination module 3 and is used for designing a control circuit according to the first logic relationship so as to realize switching of channel modes by controlling the on/off of the channel switches through the control circuit.
Further, the number of the conducting wires is multiple, the test resistance is the resistance between every two conducting wires, and one test resistance is correspondingly detected in each channel mode. The number of the conductive lines may be three, four, five, etc., and this embodiment will be described in detail with reference to the channel mode switching test design system when the number of the conductive lines is four.
The number of the leads is four, and the leads are a first lead, a second lead, a third lead and a fourth lead; the number of the test resistors and the number of the channel modes are six, and the six channel modes are a first channel mode for detecting the test resistors between the first lead and the second lead, a second channel mode for detecting the test resistors between the first lead and the third lead, a third channel mode for detecting the test resistors between the first lead and the fourth lead, a fourth channel mode for detecting the test resistors between the second lead and the fourth lead, a fifth channel mode for detecting the test resistors between the second lead and the third lead, and a sixth channel mode for detecting the test resistors between the third lead and the fourth lead.
Referring to fig. 2, a reactor coolant temperature channel adopts a four-wire Pt100 thermal resistor, constant current is provided for the thermal resistor through two wires, the resistor is converted into a voltage signal, and the voltage signal is sent to a DCS cabinet through the other two wires; r in the figure 1 、r 2 、r 3 、r 4 Line resistances of the first, second, third, and fourth conductive lines, respectively, and R represents a thermal resistance RTD. The calibration test of the reactor coolant temperature channel needs to be executed on a temperature platform with the temperature of 120 ℃, 180 ℃, 230 ℃ and 291.4 ℃ in the temperature rising process, and the resistance R between every two leads needs to be measured in a cabinet of a DCS in the test process 12 、R 13 、R 14 、R 23 、R 24 、R 34 Then through R 12 、R 13 、R 14 、R 23 、R 24 、R 34 Calculating the resistance value R and the line resistance R of the thermal resistance 1 、r 2 、r 3 、r 4 Electricity (D) fromAnd the resistance value is used for checking the aging degree of the cable by analyzing the variation trend of the line resistance of each temperature platform.
Referring to fig. 3, the channel mode switching test device designed by the channel mode switching test design system is connected with the lead by an aviation connector; the input ends of the aviation connector are respectively connected with the four wires, and the output ends of the aviation connectors are respectively connected with the input ends of the channel test switching devices. Through setting up aviation joint connector, the number of times of wiring is torn open at the DCS rack during reducible test, avoids the wearing and tearing to equipment.
Further, the connection line including the plurality of channel switches is: one end of each channel switch is connected with one lead, and the other end of each channel switch is connected with one input interface of the resistance measuring instrument.
Because the number of the wires is four, the number of the input ends of the connecting circuit is equal to the number of the wires and is four; because the test resistor is the resistor between every two wires of detection, consequently the quantity of the output of interconnecting link is two, corresponds two input interface on the resistance measuring apparatu respectively. Six combinations of two of the four leads are selected, namely six test resistors need to be correspondingly detected, and six channel switches need to be adopted to respectively control the connection or disconnection of the channels of the six test resistors.
Referring to fig. 4, the six channel switches are respectively denoted as a first automatic switch X1, a second automatic switch X2, a third automatic switch X3, a fourth automatic switch X4, a fifth automatic switch X5, and a sixth automatic switch X6; the output end of the aviation connector (see fig. 3) is respectively connected with one end IN1 of the first channel switch X1, a common end IN2 of the second channel switch X2 and the third channel switch X3, a common end IN3 of the fourth channel switch X4 and the fifth channel switch X5, and one end IN4 of the sixth channel switch X6. After the above analysis, the connection circuit including the plurality of channel switches is specifically designed as follows: two ends of the first channel switch X1 are respectively connected to the first wire and the first input interface OUT1 of the resistance measuring instrument, two ends of the second channel switch X2 are respectively connected to the second wire and the first input interface OUT1, two ends of the third channel switch X3 are respectively connected to the second wire and the second input interface OUT2 of the resistance measuring instrument, two ends of the fourth channel switch X4 are respectively connected to the third wire and the first input interface OUT1, two ends of the fifth channel switch X5 are respectively connected to the third wire and the second input interface OUT2, and two ends of the sixth channel switch X6 are respectively connected to the fourth wire and the second input interface OUT2.
Through the arrangement, the conducting or disconnecting of the conducting wires is realized through the on-off of the channel switch, so that the measurement of the test resistance between every two conducting wires is realized; the problem of manual change surveyed wire complex operation is solved, adopt six kinds of channel modes automatic switch-over to measure the passageway, can avoid human error.
Further, the logic relationship determining module 3 is connected to the first designing module 2, and is configured to determine, respectively, a channel switch that needs to be turned on in each of the channel modes;
and determining a first logic relationship between each channel mode and the corresponding channel switch to be conducted according to the channel switch to be conducted.
With reference to fig. 4, it is analyzed that in each of the channel modes, the channel switch to be turned on is specifically turned on in a manner that, in the first channel mode S1, only the first channel switch X1 and the third channel switch X3 are turned on; in the second channel mode S2, only the first channel switch X1 and the fifth channel switch X5 are turned on; in the third channel mode S3, only the first channel switch X1 and the sixth channel switch X6 are turned on; in the fourth channel mode S4, only the second channel switch X2 and the sixth channel switch X6 are turned on; in the fifth channel mode S5, only the second channel switch X2 and the fifth channel switch X5 are turned on; in the sixth channel mode S6, only the third channel switch X3 and the fourth channel switch X4 are turned on; the corresponding relation table of the channel mode and the channel switch is shown in table 1;
TABLE 1 correspondence of channel modes to channel switches
Referring to table 1, the first logical relationship between the channel mode and the channel switch is specifically:
wherein X 1 、X 2 、X 3 、X 4 、X 5 、X 6 Respectively showing a first channel switch, a second channel switch, a third channel switch, a fourth channel switch, a fifth channel switch and a sixth channel switch; s 1 、S 2 、S 3 、S 4 、S 5 、S 6 Respectively representing a first channel mode, a second channel mode, a third channel mode, a fourth channel mode, a fifth channel mode and a sixth channel mode.
It can be seen from the first logical relationship that each channel mode corresponds to the conduction of two channel switches, that is, the two channel switches need to be closed when each test resistor is detected. In order to simplify the operation steps, the test resistance can be detected through one button as much as possible, namely the following logic relationship is designed according to the first logic relationship: a second logic relation of channel mode switching is realized through the conduction of one button; and designing a control circuit according to the second logic relation so as to realize the switching of the channel mode by controlling the on or off of the button through the control circuit. Therefore, a truth table of the channel mode and the channel switch is established according to the table 1, and the truth table is shown as the table 2;
| truth table | S1 | S2 | S3 | S4 | | S6 |
| X1 | ||||||
| 1 | 1 | 1 | 0 | 0 | 0 | |
| X2 | 0 | 0 | 0 | 1 | 1 | 0 |
| |
1 | 0 | 0 | 0 | 0 | 0 |
| X4 | 0 | 0 | 0 | 0 | 0 | 1 |
| X5 | 0 | 1 | 0 | 0 | 1 | 0 |
| X6 | 0 | 0 | 1 | 1 | 0 | 1 |
TABLE 2 truth table for channel mode and channel switch
Referring to table 2, the second logical relationship is as follows:
wherein S is 1 、S 2 、S 3 、S 4 、S 5 、S 6 In addition to respectively representing the first channel mode, the second channel mode, the third channel mode, the fourth channel mode, the fifth channel mode and the sixth channel mode, buttons corresponding to each channel mode are also respectively represented. Each channel switch given by the second logic relationship is characterized by a plurality of buttons related to the channel switch through NAND gate operation firstly and then NOT gate operation secondly, and the designed control circuit is a relatively simplified circuit; in addition, the control circuit may be another circuit derived from the first logical relationship.
The second embodiment of the invention provides a channel switching design method applied to a nuclear power plant, which comprises the following steps:
step 2: designing a connection line comprising a plurality of channel switches between the conductor and the resistance measuring instrument, so that each channel mode can be characterized by the on or off of different channel switches;
and step 3: determining a first logic relation between the channel mode and the channel switch according to the conduction condition of the channel switch under each channel mode;
and 4, step 4: and designing a control circuit according to the first logic relation so as to realize the switching of channel modes through the control of the on or off of the channel switches.
Further, the number of the leads is multiple, the test resistance is the resistance between every two leads, and each channel mode correspondingly detects one test resistance. The number of the wires may be three, four, five, etc., and this embodiment will be described in detail with reference to the channel switching test design system when the number of the wires is four.
The number of the conducting wires in the step 1 is four, and the four conducting wires are respectively marked as a first conducting wire, a second conducting wire, a third conducting wire and a fourth conducting wire; the number of the test resistors and the number of the channel patterns are six, and the six channel patterns are respectively recorded as a first channel pattern for detecting the resistance between the first wire and the second wire, a second channel pattern for detecting the resistance between the first wire and the third wire, a third channel pattern for detecting the resistance between the first wire and the fourth wire, a fourth channel pattern for detecting the resistance between the second wire and the fourth wire, a fifth channel pattern for detecting the resistance between the second wire and the third wire, and a sixth channel pattern for detecting the resistance between the third wire and the fourth wire.
Referring to fig. 2, a reactor coolant temperature channel adopts a four-wire Pt100 thermal resistor, two wires supply constant current to the thermal resistor, the resistor is converted into a voltage signal, and the voltage signal is sent to a DCS cabinet through the other two wires; r in the figure 1 、r 2 、r 3 、r 4 Line resistances of the first, second, third, and fourth conductive lines, respectively, and R represents a thermal resistance RTD. The calibration test of the reactor coolant temperature channel needs to be executed on a temperature platform with the temperature of 120 ℃, 180 ℃, 230 ℃ and 291.4 ℃ in the temperature rising process, and the resistance R between every two leads needs to be measured in a cabinet of the DCS in the test process 12 、R 13 、R 14 、R 23 、R 24 、R 34 Then through R 12 、R 13 、R 14 、R 23 、R 24 、R 34 Calculating the resistance value R and the line resistance R of the thermal resistance 1 、r 2 、r 3 、r 4 The aging degree of the cable is checked by analyzing the variation trend of the line resistance of each temperature platform.
Referring to fig. 3, the channel mode switching test device designed by the channel mode switching test design system is connected with the lead by an aviation connector; the input end of the aviation connector is connected with the four wires respectively, and the output end of the aviation connector is connected with the input end of the channel test switching device respectively. Through setting up aviation joint connector, the number of times of wiring is torn open at the DCS rack during reducible test, avoids the wearing and tearing to equipment.
Further, the connection line including the plurality of channel switches in step 2 is: one end of each channel switch is connected with one lead, and the other end of each channel switch is connected with one input interface of the resistance measuring instrument.
Because the number of the wires is four, the number of the input ends of the connecting circuit is equal to the number of the wires and is four; because the test resistor is the resistor between every two wires of detection, consequently the quantity of the output of interconnecting link is two, corresponds two input interface on the resistance measuring apparatu respectively. Six combinations of two of the four leads are selected, namely six test resistors need to be correspondingly detected, and six channel switches need to be adopted to respectively control the connection or disconnection of the channels of the six test resistors.
Referring to fig. 4, the six channel switches are respectively denoted as a first automatic switch X1, a second automatic switch X2, a third automatic switch X3, a fourth automatic switch X4, a fifth automatic switch X5, and a sixth automatic switch X6; the output end of the aviation connector (see fig. 3) is respectively connected with one end IN1 of the first channel switch X1, a common end IN2 of the second channel switch X2 and the third channel switch X3, a common end IN3 of the fourth channel switch X4 and the fifth channel switch X5, and one end IN4 of the sixth channel switch X6. The connection line including the plurality of channel switches in step 2 is specifically designed to: two ends of the first channel switch X1 are respectively connected to the first wire and the first input interface OUT1 of the resistance measuring instrument, two ends of the second channel switch X2 are respectively connected to the second wire and the first input interface OUT1, two ends of the third channel switch X3 are respectively connected to the second wire and the second input interface OUT2 of the resistance measuring instrument, two ends of the fourth channel switch X4 are respectively connected to the third wire and the first input interface OUT1, two ends of the fifth channel switch X5 are respectively connected to the third wire and the second input interface OUT2, and two ends of the sixth channel switch X6 are respectively connected to the fourth wire and the second input interface OUT2.
Through the arrangement, the conducting or disconnecting of the conducting wires is realized through the on-off of the channel switch, so that the measurement of the test resistance between every two conducting wires is realized; the problem of manual change surveyed wire complex operation is solved, adopt six kinds of channel modes automatic switch-over to measure the passageway, can avoid human error.
Further, the step 3 specifically comprises: respectively determining channel switches to be conducted in each channel mode;
and determining a first logic relationship between each channel mode and the corresponding channel switch to be conducted according to the channel switch to be conducted.
In each channel mode, the specific condition of the channel switch to be turned on is that, in the first channel mode S1, only the first channel switch X1 and the third channel switch X3 are turned on; in the second channel mode S2, only the first channel switch X1 and the fifth channel switch X5 are turned on; in the third channel mode S3, only the first channel switch X1 and the sixth channel switch X6 are turned on; in the fourth channel mode S4, only the second channel switch X2 and the sixth channel switch X6 are turned on; in the fifth channel mode S5, only the second channel switch X2 and the fifth channel switch X5 are turned on; in the sixth channel mode S6, only the third channel switch X3 and the fourth channel switch X4 are turned on; the correspondence table of the channel mode and the channel switch is as shown in table 1 above;
referring to table 1 above, the first logical relationship is specifically:
wherein, X 1 、X 2 、X 3 、X 4 、X 5 、X 6 Respectively showing a first channel switch, a second channel switch, a third channel switch, a fourth channel switch, a fifth channel switch and a sixth channel switch; s 1 、S 2 、S 3 、S 4 、S 5 、S 6 Respectively representing a first channel mode, a second channel mode, a third channel mode, a fourth channel mode, a fifth channel mode and a sixth channel mode.
It can be seen from the first logical relationship that each channel mode corresponds to the conduction of two channel switches, that is, the two channel switches need to be closed when each test resistor is detected. In order to simplify the operation steps, the test resistance can be detected through one button as much as possible, namely the following logic relationship is designed according to the first logic relationship: a second logic relation of channel mode switching is realized through the conduction of one button; and designing a control circuit according to the second logic relation so as to realize the switching of the channel mode by controlling the on or off of the button through the control circuit.
Referring to table 2 above, the second logical relationship is as follows:
wherein S is 1 、S 2 、S 3 、S 4 、S 5 、S 6 In addition to respectively representing the first channel mode, the second channel mode, the third channel mode, the fourth channel mode, the fifth channel mode and the sixth channel mode, buttons corresponding to each channel mode are also respectively represented. Each channel switch given by the second logic relationship is characterized by a plurality of buttons related to the channel switch through NAND gate operation firstly and then NOT gate operation secondly, and the designed control circuit is a relatively simple circuit; in addition, the control circuit may be another circuit derived from the first logical relationship.
Referring to fig. 5, in order to distinguish from the channel mode, the buttons are represented by different reference numerals T; in particular, the button comprises a first channel pattern S 1 Corresponding first button T1 and the second channel mode S 2 A corresponding second button T2, and the third channel mode S 3 Corresponding third button T3, and the fourth channel mode S 4 A corresponding fourth button T4 corresponding to the fifth channel mode S 5 A corresponding fifth button T5 corresponding to the sixth channel mode S 6 A corresponding sixth button T6; the control circuit is designed to turn on two channel switches corresponding to each button being turned on, so as to detect a test resistor corresponding to a channel mode.
Referring to fig. 6, the second logic relationship is specifically designed as follows: the first channel switch X1 is obtained by first performing not gate operation on a first button T1, a second button T2 and a second button T3 respectively and then performing not gate operation on the first button and the second button; the second channel switch X2 is obtained by the fourth button T4 and the fifth button T5 through not gate operation and then nand gate operation, respectively; the third channel switch X3 is directly obtained by the first button T1; the fourth channel switch X4 is directly obtained by the sixth button T6; the fifth channel switch X5 is obtained by the second button T2 and the fifth button T5 through not gate operation and then nand gate operation, respectively; the sixth channel switch X6 is obtained by first performing not gate operation on the third button T3, the fourth button T4, and the sixth button T6, respectively, and then performing nand gate operation; meanwhile, in order to arrange the circuit structure neatly, in this embodiment, the third channel switch X3 is obtained by performing two not operations on the first button T1; the fourth channel switch X4 is obtained by performing two not operations on the sixth button T6.
With reference to fig. 7, the design of the control circuit is shown through a specific circuit structure, in this embodiment, the first channel switch X1, the second channel switch X2, the third channel switch X3, the fourth channel switch X4, the fifth channel switch X5, and the sixth channel switch X6 are all relays; the two ends of the first channel switch X1, the two ends of the second channel switch X2, the two ends of the third channel switch X3, the two ends of the fourth channel switch X4, the two ends of the fifth channel switch X5 and the two ends of the sixth channel switch X6 correspond to the normally open contact and the normally closed contact of the relay respectively. The model of the relay is SRD-5VDC-SL-C.
The specific circuit structure of the control circuit is as follows: the inverter comprises a first inverter U5A, a second inverter U5B, a third inverter U5C, a fourth inverter U5D, a fifth inverter U5E, a sixth inverter U5F, a first NAND gate U1A, a second NAND gate U2A, a third NAND gate U2B, a fourth NAND gate U2C, a fifth NAND gate U2D and a sixth NAND gate U1B, wherein the models of the first inverter U5A, the second inverter U5B, the third inverter U5C, the fourth inverter U5D, the fifth inverter U5E and the sixth inverter U5F are 74HC04D.
The output end of the first button T1, the first inverter U5A, the first NAND gate U1A and the input end of the coil of the first channel switch X1 are connected in sequence; the output end of the first button T1, the first phase inverter U5A, the third NAND gate U2B and the input end of the coil of the third channel switch X3 are connected in sequence;
the output end of the second button T2, the second inverter U5B, the first nand gate U1A, and the input end of the coil of the first channel switch X1 are connected in sequence; the output end of the second button T2, the second inverter U5B, the fifth nand gate U2D, and the input end of the coil of the fifth channel switch X5 are connected in sequence;
the output end of the third button T3, the third inverter U5C, the first nand gate U1A, and the input end of the coil of the first channel switch X1 are connected in sequence; the output end of the third button T3, the third inverter U5C, the sixth nand gate U1B, and the input end of the coil of the sixth channel switch X6 are connected in sequence;
the output end of the fourth button T4, the fourth inverter U5D, the second nand gate U2A, and the input end of the coil of the second channel switch X2 are connected in sequence; the output end of the fourth button T4, the fourth inverter U5D, the sixth nand gate U1B, and the input end of the coil of the sixth channel switch X6 are connected in sequence;
the output end of the fifth button T5, the fifth inverter U5E, the second nand gate U2A, and the input end of the coil of the second channel switch X2 are connected in sequence; the output end of the fifth button T5, the fifth inverter U5E, the fifth nand gate U2D, and the input end of the coil of the fifth channel switch X5 are connected in sequence;
the output end of the sixth button T6, the sixth inverter U5F, the fourth nand gate U2C, and the input end of the coil of the fourth channel switch X4 are connected in sequence; an output end of the sixth button T6, the sixth inverter U5F, the sixth nand gate U1B, and an input end of the coil of the sixth channel switch X6 are connected in sequence.
Through the arrangement, the first button T1, the second button T2, the third button T3, the fourth button T4, the fifth button T5 and the sixth button T6 are respectively controlled to be closed, so that the resistance R between the first lead and the second lead of the thermal resistance temperature probe can be obtained through the resistance measuring instrument 12 And a resistor R between the first and third wires 13 And a resistor between the first and fourth wiresR 14 And a resistor R between the second and fourth wires 24 A resistor R between the second and third wires 23 And a resistor R between the third and fourth wires 34 (ii) a The operation is more convenient. The control circuit adopting the first NOT gate and then the NAND gate is a relatively precise and simplified circuit design; in addition, other control circuits designed by the first logic relationship may be used.
With reference to fig. 6, the first nand gate U1A and the sixth nand gate U1B are both four-input nand gates, and the connection ports of the first nand gate U1A and the first inverter U5A, the connection ports of the first nand gate U1A and the second inverter U5B, and the connection ports of the first nand gate U1A and the third inverter U5C are different; the connection port of the sixth nand gate U1B and the third inverter U5C, the connection port of the sixth nand gate U1B and the fourth inverter U5D, and the connection port of the sixth nand gate U1B and the sixth inverter U5F are different;
the second nand gate U2A and the fifth nand gate U2D are two-input nand gates, and connection ports of the second nand gate U2A and the fourth inverter U5D are different from connection ports of the second nand gate U2A and the fifth inverter U5E; and the connection port of the fifth NAND gate U2D and the second inverter U5B and the connection port of the fifth NAND gate U2D and the fifth inverter U5E are different. The model of the four-input NAND gate is 74HC20D; the model of the two-input NAND gate is 74LS00D.
Referring to fig. 7, the output terminal of the first button T1, the output terminal of the second button T2, the output terminal of the third button T3, the output terminal of the fourth button T4, the output terminal of the fifth button T5, and the output terminal of the sixth button T6 are all grounded through a first resistor. The resistance value of the first resistor is preferably 2k omega; the first resistance is preferably a color wheel resistance.
Driving circuits are connected between the first nand gate U1A and the first channel switch X1, between the second nand gate U2A and the second channel switch X2, between the third nand gate U2B and the third channel switch X3, between the fourth nand gate U2C and the fourth channel switch X4, between the fifth nand gate U2D and the fifth channel switch X5, and between the sixth nand gate U1B and the sixth channel switch X6.
Referring to fig. 9, the driving circuit includes a second resistor, a third resistor and an NPN transistor, one end of the second resistor is an input end of the driving circuit, the other end of the second resistor is connected to a base of the NPN transistor Q, and an emitter of the NPN transistor Q is grounded; the collector of the NPN triode Q is the output end of the driving circuit; one end of the third resistor is connected with the base electrode of the NPN triode, and the other end of the third resistor is grounded. The second resistor and the third resistor have a resistance of 4.7k omega, preferably a color circle resistor. The model of the NPN triode is BJT _ NPN, S8050. Both ends of the coil of the first channel switch X1, both ends of the coil of the second channel switch X2, both ends of the coil of the third channel switch X3, both ends of the coil of the fourth channel switch X4, both ends of the coil of the fifth channel switch X5, and both ends of the coil of the sixth channel switch X6 are all connected in parallel with a diode D; and the anode of the diode D is also connected with the collector of the NPN triode Q. The model of the diode D is 1N4007GP.
Since the working voltage of the logic device and the relay adopted is 5V, a voltage-stabilized power supply circuit outputting +5V needs to be designed, referring to fig. 7, the control circuit further includes a power supply circuit, and the input end of the first button T1, the input end of the second button T2, the input end of the third button T3, the input end of the fourth button T4, the input end of the fifth button T5, the input end of the sixth button T6, the output end of the coil of the first channel switch X1, the output end of the coil of the second channel switch X2, the output end of the coil of the third channel switch X3, the output end of the coil of the fourth channel switch X4, the output end of the coil of the fifth channel switch X5, and the output end of the coil of the sixth channel switch X6 are all connected to the output end of the power supply circuit.
Referring to fig. 10, the power supply circuit is composed of a three-terminal regulator U4 and filter capacitors C1 and C2, the range of the direct-current input voltage is 8-36V, the output voltage is 4.8-5.2V, and the maximum output current is 1.5A; specifically, the power supply circuit comprises a three-terminal regulator U4, a first filter capacitor C1 and a second filter capacitor C2, wherein the input end of the three-terminal regulator U4 is connected with a direct-current power supply, and the grounding end of the three-terminal regulator U4 is grounded; the anode of the first filter capacitor C1 is connected with the input end of the three-terminal regulator U4, and the cathode of the first filter capacitor C1 is grounded; the anode of the second filter capacitor C2 is connected with the output end of the three-terminal regulator U4, and the cathode of the second filter capacitor C2 is grounded; and the output end of the three-terminal voltage regulator U4 is the output end of the power supply circuit. The model of the three-terminal regulator U4 is LM7805CT. 470uF is selected for the first filter capacitor C1 and the first filter capacitor C1.
Referring to fig. 7, the specific connections of the channel mode switching logic circuit are: one end of the first button T1 is connected with the output end of a power circuit, the other end of the first button T1 is connected with the input end of a first inverter U5A, the output end of the first inverter U5A is connected with the first input end of a first NAND gate U1A, the output end of the first NAND gate U1A is connected with one end of a coil of a first channel switch X1, and the other end of the coil of the first channel switch X1 is connected with the output end of the power circuit; the output end of the first phase inverter U5A is also connected with the first input end of the third NAND gate U2B, the output end of the third NAND gate U2B is connected with one end of the coil of the third channel switch X3, and the other end of the coil of the third channel switch X3 is connected with the output end of the power supply;
one end of the second button T2 is connected to the output end of the power circuit, the other end of the second button T2 is connected to the input end of the second inverter U5B, and the output end of the second inverter U5B is connected to the second input end of the first nand gate U1A; the output end of the second inverter U5B is further connected to the first input end of the fifth nand gate U2D; the output end of the fifth nand gate U2D is connected with one end of the coil of the fifth channel switch X5, and the other end of the coil of the fifth channel switch X5 is connected with the output end of the power circuit;
one end of the third button T3 is connected to the output end of the power circuit, the other end of the third button T3 is connected to the input end of the third inverter U5C, and the output end of the third inverter U5C is connected to the third input end of the first nand gate U1A; the output end of the third inverter U5C is further connected to the first input end of the sixth nand gate U1B, the output end of the sixth nand gate U1B is connected to one end of the coil of the sixth channel switch X6, and the other end of the coil of the sixth channel switch X6 is connected to the output end of the power circuit;
one end of the fourth button T4 is connected to the output end of the power circuit, the other end of the fourth button T4 is connected to the input end of the fourth inverter U5D, the output end of the fourth inverter U5D is connected to the first input end of the second nand gate U2A, the output end of the second nand gate U2A is connected to one end of the coil of the second channel switch X2, and the other end of the coil of the second channel switch X2 is connected to the output end of the power circuit;
one end of the fifth button T5 is connected to the output end of the power circuit, the other end of the fifth button T5 is connected to the input end of the fifth inverter U5E, and the output end of the fifth inverter U5E is connected to the second input end of the second nand gate U2A; the output end of the fifth inverter U5E is further connected to the second input end of the fifth nand gate U2D;
one end of the sixth button T6 is connected to the output end of the power circuit, the other end of the sixth button T6 is connected to the input end of the sixth inverter U5F, the output end of the sixth inverter U5F is connected to the first input end of the fourth nand gate U2C, the output end of the fourth nand gate U2C is connected to one end of the coil of the fourth channel switch X4, and the other end of the fourth channel switch X4 is connected to the output end of the power circuit; the output end of the sixth inverter U5F is further connected to the third input end of the sixth nand gate U1B.
The channel mode input signal is formed by adopting switching buttons T1-T6 and a first resistor, six inverters U5, two four-input NAND gates U1 and four two-input NAND gate U2 devices are selected according to a logic diagram of channel mode switching, and when the buttons T1-T6 are not pressed, the input end of the inverter U5 is at a low level due to grounding of the first resistor, which indicates that the switching signal input is 0. When any one of the buttons T1-T6 is pressed, the input terminal of the corresponding inverter U5 is at a high level, which indicates that the switching signal input is 1.
In a third embodiment, the invention provides a channel switching device applied to a nuclear power plant, which is designed by adopting any one of the channel switching design systems applied to the nuclear power plant.
The application of the channel switching device comprises the following steps:
step a: detecting the resistance value of each test resistor: closing only the first button T1 to obtain the test resistance R between the first wire and the second wire by the resistance measuring instrument 12 Only the second button T2 is closed to obtain the test resistance R between the first wire and the third wire by the resistance measuring instrument 13 Only the third button T3 is closed to obtain the test resistance R between the first wire and the fourth wire by the resistance measuring instrument 14 Only the fourth button T4 is closed to obtain the test resistance R between the second wire and the fourth wire by the resistance measuring instrument 24 Only the fifth button T5 is closed to obtain the test resistance R between the second wire and the third wire by the resistance measuring instrument 23 Only the sixth button T6 is closed to obtain the test resistance R between the third and fourth wires by the resistance measuring instrument 34 The resistance value of (1);
step b: calculating the resistance value of the thermal resistor: by obtaining a first test resistance R 12 Resistance value of, the second test resistance R 13 Resistance value of, the third test resistance R 14 Resistance value of (2), fourth test resistance R 24 Resistance value of, fifth test resistance R 23 And the sixth test resistor R 34 Calculating the resistance value of the thermal resistor;
wherein the first test resistance R 12 A second test resistance R 13 A third test resistance R 14 Fourth test electrodeResistance R 24 Fifth test resistance R 23 And a sixth test resistance R 34 Satisfying the following formulae 1.1, 1.2, 1.3, 1.4, 1.5 and 1.6, respectively:
R 12 ＝r 1 +r 2 formula 1.1
R 13 ＝r 1 +R+r 3 Formula 1.2
R 14 ＝r 1 +R+r 4 1.3 of the formula
R 23 ＝r 2 +R+r 3 Formula 1.4
R 24 ＝r 2 +R+r 4 Formula 1.5
R 34 ＝r 3 +r 4 Formula 1.6
In the formula, R 12 Representing a first test resistance; r 13 Representing a second test resistance; r 14 Represents a third test resistance; r 24 Represents a fourth test resistance; r 23 Represents a fifth test resistance; r 34 Represents a sixth test resistance; r is a radical of hydrogen 1 Representing a line resistance of the first wire; r is 2 Representing a line resistance of the second conductive line; r is a radical of hydrogen 3 Represents a line resistance of the third conductive line; r is a radical of hydrogen 4 Represents a line resistance of the fourth conductive line;
the calculation formula of the thermal resistance can be derived from the above formulas 1.1 to 1.6 as follows:
R＝[R 13 +R 14 +R 23 +R 24 -(R 12 +R 34 )]formula 1.7 of/4
Wherein R represents a thermal resistor;
a first test resistance R 12 Resistance value of (2), second test resistance R 13 Resistance value of (2), third test resistance R 14 Resistance value of (2), fourth test resistance R 24 Resistance value of, fifth test resistance R 23 And the sixth test resistor R 34 Substituting the resistance value of the resistor into the formula 1.7 to obtain the resistance value R of the thermal resistor;
step c: inquiring a relation curve between the resistance value and the temperature of the thermal resistor according to the type of the thermal resistor so as to obtain the actual temperature corresponding to the thermal resistor;
step d: and calibrating the reactor coolant temperature channel according to the actual temperature.
In addition, the following formulae 2.1 to 2.4 can be derived from the above formulae 1.1 to 1.6:
r 1 ＝(R 12 +R 13 -R 23 ) 2 formula 2.1
r 2 ＝(R 12 +R 24 -R 14 ) 2 formula 2.2
r 3 ＝(R 23 +R 34 -R 24 ) 2 formula 2.3
r 4 ＝(R 34 +R 24 -R 23 ) 2 formula 2.4
The first test resistance R 12 Resistance value of, the second test resistance R 13 Resistance value of, the third test resistance R 14 Resistance value of (2), fourth test resistance R 24 Resistance value of, fifth test resistance R 23 And the sixth test resistor R 34 The resistance value of (2) is substituted into the above-mentioned formulas 2.1 to 2.4 to respectively obtain the line resistance r of the conductive line 1 、r 2 、r 3 、r 4 (ii) a The aging degree of the cable can be checked by analyzing the variation trend of the line resistance of each temperature platform; and guarantee is provided for aging failure management of the nuclear power station key equipment. Reactor coolant temperature channel calibration tests typically require a 120 deg.C, 180 deg.C, 230 deg.C, 291.4 deg.C temperature plateau during ramp up.
The test results of the performance test of the channel switching device are shown in table 3.
TABLE 3 Performance testing of channel switching devices
Referring to table 3, the relative error of the channel switching device is less than 0.01%, and the introduced error is small, so that the requirement of test measurement accuracy is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A channel switching design system applied to a nuclear power plant is characterized by comprising:
the channel mode determining module (1) is used for determining the number of test resistors to be detected according to the number of wires connected with the thermal resistor temperature probes; each test resistor corresponds to one channel mode; the number of the leads is multiple, the test resistor is a resistor between every two leads, and each channel mode correspondingly detects one test resistor;
a first design module (2) connected to the channel mode determination module (1) for designing a connection line between the conductor and the resistance measuring instrument, the connection line including a plurality of channel switches, such that each of the channel modes can be characterized by the on or off of a different channel switch;
the logic relation determining module (3) is connected with the first design module (2) and used for determining a first logic relation between the channel mode and the channel switch according to the conduction condition of the channel switch under each channel mode; and
and the second design module (4) is connected with the logic relation determination module (3) and is used for designing a control circuit according to the first logic relation so as to realize switching of channel modes by controlling the on or off of the channel switches through the control circuit.
2. The system of claim 1, wherein the connection lines including the plurality of channel switches are: one end of each channel switch is connected with one lead, and the other end of each channel switch is connected with one input interface of the resistance measuring instrument.
3. The channel switching design system applied to the nuclear power plant according to claim 2, wherein the logic relationship determining module (3) is connected to the first design module (2) for respectively determining the channel switches to be turned on in each channel mode;
and determining a first logic relationship between each channel mode and the corresponding channel switch to be conducted according to the channel switch to be conducted.
4. The channel switching design system applied to nuclear power plant according to claim 3, wherein the second design module (4) is connected to the logical relationship determination module (3) and is configured to design, according to the first logical relationship: a second logic relation of channel mode switching is realized through the conduction of one button; and designing a control circuit according to the second logic relation so as to realize the switching of the channel mode by controlling the on or off of the button through the control circuit.
5. A channel switching design method applied to a nuclear power plant is characterized by comprising the following steps:
determining the number of test resistors to be detected according to the number of wires connected with the thermal resistor temperature probes; each test resistor corresponds to one channel mode; the number of the leads is multiple, the test resistor is a resistor between every two leads, and one test resistor is correspondingly detected in each channel mode;
designing a connecting line comprising a plurality of channel switches between the lead and the resistance measuring instrument, so that each channel mode can be characterized by the connection or disconnection of different channel switches;
determining a first logic relation between the channel mode and the channel switch according to the conduction condition of the channel switch under each channel mode;
and designing a control circuit according to the first logic relation so as to realize the switching of the channel modes by controlling the on or off of the channel switches through the control circuit.
6. The method as claimed in claim 5, wherein the connection lines including the plurality of channel switches are: one end of each channel switch is connected with one lead, and the other end of each channel switch is connected with one input interface of the resistance measuring instrument.
7. The method for designing channel switching applied to the nuclear power plant according to claim 6, wherein a control circuit is designed according to the first logic relationship, so as to control the on/off of the channel switches through the control circuit, and the switching of the channel mode is specifically realized as follows: designing according to the first logic relation: a second logic relation of channel mode switching is realized through the conduction of one button; and designing a control circuit according to the second logic relation so as to realize the switching of the channel mode by controlling the on or off of the button through the control circuit.
8. A channel switching apparatus for a nuclear power plant, which is designed using the channel switching design system for a nuclear power plant according to any one of claims 1 to 4.
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| CN107919176A (en) * | 2017-11-06 | 2018-04-17 | 中广核工程有限公司 | A kind of nuclear power plant EAU systems automatic reading system and number reading method |
| CN208607915U (en) * | 2018-07-27 | 2019-03-15 | 北京广利核系统工程有限公司 | Resistance switching device for gamut simulation PWR nuclear power plant temperature signal |
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| CN103675458A (en) * | 2013-12-13 | 2014-03-26 | 北京航天时代光电科技有限公司 | Automatic insulation resistance and characteristic resistance tester |
| CN107919176A (en) * | 2017-11-06 | 2018-04-17 | 中广核工程有限公司 | A kind of nuclear power plant EAU systems automatic reading system and number reading method |
| CN208607915U (en) * | 2018-07-27 | 2019-03-15 | 北京广利核系统工程有限公司 | Resistance switching device for gamut simulation PWR nuclear power plant temperature signal |
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