CN108169588B - Anti-interference capability detection method and system for nuclear power station protection cabinet - Google Patents
Anti-interference capability detection method and system for nuclear power station protection cabinet Download PDFInfo
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- CN108169588B CN108169588B CN201711278081.1A CN201711278081A CN108169588B CN 108169588 B CN108169588 B CN 108169588B CN 201711278081 A CN201711278081 A CN 201711278081A CN 108169588 B CN108169588 B CN 108169588B
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Abstract
The invention relates to the technical field of nuclear instrument systems of million kilowatt nuclear power stations, and discloses an anti-interference capability detection method and an anti-interference capability detection system for nuclear power station protection cabinets.
Description
Technical Field
The invention relates to the technical field of nuclear instrument systems of million kilowatt nuclear power stations, in particular to a method and a system for detecting the anti-interference capability of nuclear power station protection cabinets.
Background
In a nuclear power plant, a SIP (Process Instrumentation System) protection cabinet sometimes causes protection malfunction due to interference of various signals, for example, a power cable of a signal generator is crossed at the top of the cabinet and connected with a DNL (Electrical Building Normal Lighting) power supply. When the load of the DNL power supply changes, the interference is generated on weak current signals in the SIP protection cabinet, the fluctuation of average temperature output signals detected in the SIP protection cabinet is caused, and the overtemperature protection action is caused.
The problem that the anti-interference capability of the SIP protection cabinet is insufficient is found in the traditional SIP protection cabinet overhauling process, but a corresponding inspection scheme and an acceptance standard are lacked for the problem that the anti-interference capability of the SIP protection cabinet is insufficient.
Disclosure of Invention
Therefore, it is necessary to provide methods and systems for detecting the anti-interference capability of the nuclear power plant protection cabinet for the problem of lack of the check scheme and the acceptance standard of the anti-interference capability of the SIP protection cabinet.
An anti-interference capability detection method and system for nuclear power station protection cabinets comprises the following steps:
providing an interference source;
arranging a power cable of the interference source at a preset position away from a signal cable in the cabinet;
starting the interference source, and detecting the variation of the average temperature signal of the over-temperature and over-power channel;
judging whether the variation of the average temperature signal is consistent with a protection margin of the temperature, if so, calibrating the distance between the current power cable and the signal cable to be an anti-interference threshold distance;
otherwise, the distance between the power cable of the interference source and the signal cable in the cabinet is adjusted until the variation of the average temperature signal is equal to the protection margin of the temperature.
In embodiments, the step of detecting the variation of the average temperature signal of the over-temperature over-power channel includes:
and simulating the variation of the average temperature signal by adopting a lead-lag dynamic module.
In embodiments, the method for calculating the protection margin of the temperature specifically includes:
adopting the overtemperature and overpower channel to calculate an overtemperature protection fixed value of the unit in a full-power running state;
measuring the temperature difference of the cold and hot sections of the unit in a full power state by adopting the over-temperature and over-power channel;
and differentiating the overtemperature protection constant value and the temperature difference of the cold and hot sections to obtain the protection allowance of the temperature.
In embodiments, the step of adjusting the distance between the power cable of the interference source and the signal cable in the cabinet until the variation is equal to a protection margin of the temperature comprises:
if the variation of the average temperature signal is larger than the protection allowance of the temperature, increasing the distance between a power cable of the interference source and a signal cable in the cabinet;
and if the variation of the average temperature signal is smaller than the protection allowance of the temperature, reducing the distance between a power cable of the interference source and a signal cable in the cabinet.
In embodiments, after the step of adjusting the distance between the power cable of the interference source and the signal cable in the cabinet until the variation of the average temperature signal is within the protection margin of the temperature, the method further comprises:
calibrating the distance between the power cable and the signal cable as an anti-interference threshold distance;
and calibrating the protection margin as an anti-interference threshold signal.
In of these embodiments, the predetermined location is at the top of the cabinet.
In embodiments, after the step of providing the interference source, the method further includes:
and setting the connection of the interference source and the power supply to be in a poor contact state.
In of these embodiments, the interferer is a ramp signal generator.
A detection system for anti-interference ability of nuclear power station protection cabinet, comprising:
the device comprises a setting module, a signal cable and a signal cable, wherein the setting module is used for providing an interference source and setting a power cable of the interference source at a preset position away from the signal cable in the cabinet;
the detection module is used for detecting the variation of the average temperature signal of the over-temperature and over-power channel;
the control module is used for judging whether the variation of the average temperature signal is consistent with a protection margin of the temperature or not, and if so, calibrating the distance between the current power cable and the signal cable to be an anti-interference threshold distance;
otherwise, the distance between the power cable of the interference source and the signal cable in the cabinet is adjusted until the variation of the average temperature signal is equal to the protection margin of the temperature.
In of these embodiments, the detection module comprises:
and the lead-lag dynamic module is used for simulating the variation of the average temperature signal of the over-temperature and over-power channel.
According to the anti-interference capability detection method for the nuclear power station protection cabinet, the variable quantity of the average temperature signal caused by the interference source is detected through the over-temperature over-power channel, and the variable quantity of the average temperature signal is compared with the protection allowance of the temperature, so that the anti-interference threshold distance between the power cable of the interference source and the signal cable is calibrated.
Drawings
Fig. 1 is a flow chart of an interference rejection capability detection method for a nuclear power plant protection cabinet according to an embodiment ;
FIG. 2 is a diagram of an embodiment of a lead-lag simulation model;
FIG. 3 is a flowchart of implementations of step S400 in FIG. 1;
FIG. 4 is a graphical representation of the results of the lead-lag simulation of the embodiment ;
FIG. 5 is a flowchart of implementations of step S500b in FIG. 1;
fig. 6 is a flowchart of a method for detecting interference rejection capability of a nuclear power plant protection cabinet according to another embodiment;
fig. 7 is a schematic view of an interference rejection capability detection system of a nuclear power plant protection cabinet according to an embodiment .
Detailed Description
Fig. 1 is a flowchart of an interference rejection capability detection method for a nuclear power plant protection cabinet in an embodiment , where the method includes the following steps:
step S100: an interference source is provided.
Step S200: and arranging a power cable of the interference source at a preset position away from the signal cable in the cabinet.
Step S300: and starting the interference source, and detecting the variation of the average temperature signal of the over-temperature and over-power channel.
And S400, judging whether the variation of the average temperature signal is consistent with a protection margin of the temperature, if so, executing the calibration process of the step S500a, otherwise, executing the adjustment process of the step S500 b.
Step S500 a: and calibrating the distance between the current power cable and the signal cable as the distance of the anti-interference threshold value.
And step S500b, adjusting the distance between the power cable of the interference source and the signal cable in the cabinet, and repeating the step S300 and the step S400 until the variation of the average temperature signal is equal to the protection margin of the temperature.
According to the anti-interference capability detection method for the nuclear power station protection cabinet, the variable quantity of the average temperature signal caused by the interference source is detected through the over-temperature over-power channel, and the variable quantity of the average temperature signal is compared with the protection allowance of the temperature, so that the anti-interference threshold distance between the power cable of the interference source and the signal cable is calibrated.
Specifically, the step of detecting the variation of the average temperature signal of the over-temperature and over-power channel in step S300 includes:
and simulating the variation of the average temperature signal by adopting a lead-lag dynamic module.
In the embodiment, aspect fails to effectively collect the fluctuation of the average temperature signal in a short time due to the low sampling rate of KIT and KDO (detection data acquisition system), and aspect has a large relation between the output curve of the lead-lag dynamic module and the amplitude, frequency and form of the fluctuation of the input signal.
Specifically, the lead-lag dynamic module is used for detecting the signal change rate in the overtemperature and overpower channel. FIG. 2 is a simulation of the lead-lag dynamics module. The average temperature signal of the over-temperature and over-power channel is input by the receiver 10, processed by the preset nonlinear lead-lag function processing module 20 to obtain the change rate of the average temperature signal, and finally the change curve of the average temperature signal is displayed by the oscilloscope 30, so as to obtain the change amount of the average temperature signal.
In this embodiment, the preset nonlinear lead-lag function is set as: the lead time T1 is 30s and the lag time T2 is 4 s.
Specifically, referring to fig. 3, the method for calculating the protection margin of the temperature specifically includes:
step S410: and calculating an overtemperature protection fixed value of the unit in a full-power running state by using the overtemperature and overpower channel.
To prevent the coolant from deviating from nucleate boiling and the fuel pellets from melting, the temperature of the fuel pellets needs to be controlled. And the over-temperature protection constant value delta T is used for preventing deviation from nucleate boiling, and the temperature of the fuel core block is controlled.
Specifically, the formula for calculating the over-temperature protection constant value Δ T is as follows:
in the formula, delta T is an overtemperature protection fixed value; t isavgThe average temperature of the hot section temperature and the cold section temperature of the loop coolant ( loop average temperature), P is the pressure of the voltage stabilizer ( loop pressure), the rotation speed of the main pump of the omega loop coolant, delta phi is the axial power deviation, and kappa6、κ3、κ5、κ4Coefficients for each influence term; tau is1、τ3、τ4Is a time constant; t is1Is the bias temperature; pnomIs a rated pressure; t isnomThe average temperature of the coolant under the rated working condition; omeganom rated speed of main coolant pump, and S is complex variable.
In embodiment, Pnom＝1.55×107pa；Tnom＝310℃；Ωnom＝1800r/min。
Step S420: measuring the temperature difference of the cold and hot sections of the unit in a full power state by adopting the over-temperature and over-power channel;
the temperature difference between the hot section temperature and the cold section temperature of the loop coolant is measured in real time through an over-temperature over-power channel and is recorded as delta T1。
Step S430: and (4) subtracting the over-temperature protection constant value and the temperature difference of the cold and hot sections to obtain the protection allowance of the temperature.
The over-temperature protection constant value delta T is obtained through the step S410, and the temperature difference delta T of the cold and hot sections is obtained through the step S4201. The over-temperature protection constant value delta T and the temperature difference delta T of the cold and hot sections1And obtaining the protection allowance of the temperature.
Specifically, when the unit operates at Full Power normally, the over-temperature protection constant value delta T is about 140% FP (Full Power), and the temperature difference delta T of the cold and hot sections1Found around 100% FP. The protection margin for the temperature thus obtained is around 40% FP.
Specifically, referring to fig. 4, the graph is a simulation graph when the variation of the average temperature signal in step S300 is greater than the protection margin in step S400. Wherein, the horizontal straight line L1 is the protection margin in step S400, and is converted into an electrical signal 80mv through simulation by 40% FP; the curve L2 is the variation of the average temperature signal in step S300. It can be seen that the variation of the average temperature signal changes in real time due to the real-time change of the interference signal of the on-site interference source. When the interference signal is relatively large, the variation L2 of the average temperature signal is higher than the protection margin L1(80mv), thereby causing the overtemperature protection action (i.e. reactor shutdown). Therefore, the protection margin 80mv is required to be used as an interference threshold signal, and the over-temperature protection operation can be avoided only when the interference signal is smaller than 80 mv. The optional disturbance threshold signal may also be set to any value from 0mv to 80 mv. Specifically, the interference threshold signal is set to 40 mv.
Specifically, as shown in fig. 5, implementations of step S500b include:
step S510 b: if the variation of the average temperature signal is larger than the protection allowance of the temperature, the distance between a power cable of the interference source and a signal cable in the cabinet is increased;
step S520 b: and if the variation of the average temperature signal is smaller than the protection allowance of the temperature, reducing the distance between the power cable of the interference source and the signal cable in the cabinet.
In this embodiment, since the interference signal generated by the power cable of the interference source is mainly an electromagnetic interference signal, the influence of the interference signal is represented as: the larger the distance between the power cable of the interference source and the signal cable in the cabinet is, the larger the variation of the average temperature signal is. Therefore, the distance between the power cable of the interference source and the cabinet signal cable can be adjusted to realize that the variation of the average temperature signal is consistent with the protection margin. When the variation of the average temperature signal is matched with the protection margin, the variation of the average temperature signal reaches the threshold of the overtemperature protection action, and meanwhile, the interference signal also reaches the interference threshold signal. Therefore, the distance between the power cable and the signal cable at this time is used as the interference threshold distance of the interference cable.
, as shown in fig. 6, after the step S500a, the method further includes:
step S600: and calibrating the protection margin as an anti-interference threshold signal.
In the embodiment, the protection margin is the protection margin of the average temperature of the loop when the unit normally operates at full power, when the average temperature fluctuation quantity of the loop is larger than the protection margin, the overtemperature protection action is caused.
Specifically, the distance of the anti-interference threshold is 600 mm; the immunity threshold signal is 80 mv.
In this embodiment, to further step to improve the sensitivity of the cabinet to interference, the interference threshold signal may be set to 40mv, and may also be set to any value from 0mv to 80mv, which is not limited herein.
Specifically, the preset position in step S200 is the top of the cabinet.
In this embodiment, the rack top is signal sensitive area, receives the influence of interfering signal easily. Therefore, the power cable of the interference source is arranged at the top of the cabinet, so that the cabinet is subjected to a larger interference signal, and the cabinet is subjected to an anti-interference capability test in the environment of the larger interference signal to obtain safe anti-interference parameters.
, the step of providing the interference source further comprises:
the connection of the interference source to the power source is set to a poor contact state.
In this embodiment, the connection of the interference source to the power source is set in a state of poor contact for the purpose of providing a large interference signal. In the testing process, the distance between a power cable of an interference source and a signal cable in the cabinet needs to be increased for reducing the interference signal, so that the distance of the finally calibrated interference threshold value is increased, and the overtemperature protection action of the unit caused by poor contact between the interference source and a power supply in the actual operation process is avoided.
In particular, the interference source is a ramp signal generator. The slope signal generator is internally provided with a voltage transformation rectifying device, so that when the slope signal generator is connected with a power supply through a power cable, a large interference signal can be generated in the power-on and power-off processes, and the variation of an average temperature signal in an over-temperature and over-power channel is influenced.
The interference source can also be a cabinet limit switch for protecting the cabinet, and the interference cable is a cabinet limit switch cable at the moment, the cabinet limit switch cable and the signal cable in the cabinet are mixed and wired, and the built-in core of the cabinet limit switch has an antenna effect, so that interference is introduced, and steps can be carried out, so that the cabinet switch cable can be drawn out of the cable groove box and is far away from the signal cable, so that the interference is eliminated.
In particular, the interference source may also be a shielded wire protecting the cabinet. When the shielding wire and the ground wire are in short circuit or close to each other, the fluctuation of the average temperature signal is detected to be large through the over-temperature over-power channel. Therefore, the shielding wire of the protection cabinet is separated from the ground wire, and the interference signal can be eliminated.
Fig. 7 is an embodiment of an antijamming capability detecting system for a nuclear power plant protection cabinet, including:
the setting module 100 is used for providing an interference source and setting a power cable of the interference source at a preset position away from a signal cable in the cabinet.
The detection module 200 is used for detecting the variation of the average temperature signal of the over-temperature and over-power channel;
the control module 300 is configured to determine whether the variation of the average temperature signal is consistent with a protection margin of the temperature, and if so, calibrate the distance between the current power cable and the signal cable to be an anti-interference threshold distance;
otherwise, the distance between the power cable of the interference source and the signal cable in the cabinet is adjusted until the variation of the average temperature signal is equal to the protection margin of the temperature.
In this embodiment, a simulation system is used to simulate the operating conditions of the over-temperature and over-power channel. The working conditions comprise a full-power operation working condition, a steady-state working condition and a transient working condition of the unit. Specifically, the simulation system is test software compiled by LabVIEW, and the core of the simulation system is to simulate the states of the over-temperature and over-power channel, such as steady-state working conditions, dynamic working conditions, accident working conditions and the like by using a simulation program.
Specifically, the control module 300 is composed of various functional cards, for example: function generators, adders, threshold comparators, etc. According to each function card, the control module 300 can calculate the protection margin and the variation of the average temperature, and display the calculation result in a graphical form (simulation diagram).
Specifically, the detection module 100 includes:
and the lead-lag dynamic module is used for simulating the variation of the average temperature signal of the over-temperature and over-power channel.
FIG. 2 is a simulation of the lead-lag dynamics module. The average temperature signal of the over-temperature and over-power channel is input by the receiver 10, processed by the preset nonlinear lead-lag function processing module 20 to obtain the change rate of the average temperature signal, and finally the change curve of the average temperature signal is displayed by the oscilloscope 30, so as to obtain the change amount of the average temperature signal.
In this embodiment, the preset nonlinear lead-lag function is set as: the lead time T1 is 30s and the lag time T2 is 4 s.
According to the anti-interference capability detection method for the nuclear power station protection cabinet, the variable quantity of the average temperature signal caused by the interference source is detected through the over-temperature over-power channel, and the variable quantity of the average temperature signal is compared with the protection allowance of the temperature, so that the anti-interference threshold distance between the power cable of the interference source and the signal cable is calibrated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
- The method for detecting the anti-interference capability of the protective cabinet of the nuclear power station is characterized by comprising the following steps:providing an interference source;arranging a power cable of the interference source at a preset position away from a signal cable in the cabinet;starting the interference source, and detecting the variation of the average temperature signal of the over-temperature and over-power channel;judging whether the variation of the average temperature signal is consistent with a protection margin of the temperature, if so, calibrating the distance between the current power cable and the signal cable to be an anti-interference threshold distance;otherwise, adjusting the distance between the power cable of the interference source and the signal cable in the cabinet until the variation of the average temperature signal is equal to the protection margin of the temperature;and the protection allowance of the temperature is obtained by the difference between the overtemperature protection constant value and the temperature difference of the cold and hot sections.
- 2. The antijam capability detection method of claim 1, wherein the step of detecting the variation of the average temperature signal of the over-temperature and over-power channel includes:and simulating the variation of the average temperature signal by adopting a lead-lag dynamic module.
- 3. The interference rejection capability detection method according to claim 1, wherein the method for calculating the protection margin of the temperature specifically comprises:adopting the overtemperature and overpower channel to calculate an overtemperature protection fixed value of the unit in a full-power running state;measuring the temperature difference of the cold and hot sections of the unit in a full power state by adopting the over-temperature and over-power channel;and differentiating the overtemperature protection constant value and the temperature difference of the cold and hot sections to obtain the protection allowance of the temperature.
- 4. The method for detecting interference rejection capability of claim 1, wherein said step of adjusting the distance between the power cable of said interference source and the signal cable in the cabinet until said variation is equal to a protection margin of temperature comprises:if the variation of the average temperature signal is larger than the protection allowance of the temperature, increasing the distance between a power cable of the interference source and a signal cable in the cabinet;and if the variation of the average temperature signal is smaller than the protection allowance of the temperature, reducing the distance between a power cable of the interference source and a signal cable in the cabinet.
- 5. The antijam capability detection method of claim 1, wherein after the step of calibrating the current distance between the power cable and the signal cable as the antijam threshold distance, the method further comprises:and calibrating the protection margin as an anti-interference threshold signal.
- 6. The antijam capability detection method of claim 1 wherein the predetermined location is a top of the cabinet.
- 7. The antijam capability detection method of claim 1, wherein said step of providing an interference source is followed by the steps of:and setting the connection of the interference source and the power supply to be in a poor contact state.
- 8. The antijam capability detection method of claim 1, wherein the interference source is a ramp signal generator.
- The interference killing feature detecting system of kinds of nuclear power station protection rack, its characterized in that includes:the device comprises a setting module, a signal cable and a signal cable, wherein the setting module is used for providing an interference source and setting a power cable of the interference source at a preset position away from the signal cable in the cabinet;the detection module is used for detecting the variation of the average temperature signal of the over-temperature and over-power channel;the control module is used for judging whether the variation of the average temperature signal is consistent with a protection margin of the temperature or not, and if so, calibrating the distance between the current power cable and the signal cable to be an anti-interference threshold distance;otherwise, adjusting the distance between the power cable of the interference source and the signal cable in the cabinet until the variation of the average temperature signal is equal to the protection margin of the temperature;and the protection allowance of the temperature is obtained by the difference between the overtemperature protection constant value and the temperature difference of the cold and hot sections.
- 10. The antijam capability detection system of claim 9 wherein said detection module includes:and the lead-lag dynamic module is used for simulating the variation of the average temperature signal of the over-temperature and over-power channel.
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| KR101740626B1 (en) * | 2015-11-09 | 2017-05-26 | 국민대학교산학협력단 | Device and method for configurating multiple interferers, and interference analysis device and method using multiple interferers |
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| CN102508070A (en) * | 2011-11-03 | 2012-06-20 | 国网电力科学研究院 | Method for ensuring radio inference of transmission line |
| CN104808083A (en) * | 2015-04-03 | 2015-07-29 | 中广核核电运营有限公司 | Nuclear power station anti-electromagnetic interference testing system |
| CN106646025A (en) * | 2016-11-04 | 2017-05-10 | 国网山东省电力公司济南市长清区供电公司 | High voltage distribution line electromagnetic interference determinator |
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