CN214428341U - Signal fast switching circuit for realizing response time measurement of protection system - Google Patents
Signal fast switching circuit for realizing response time measurement of protection system Download PDFInfo
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- CN214428341U CN214428341U CN202021998818.4U CN202021998818U CN214428341U CN 214428341 U CN214428341 U CN 214428341U CN 202021998818 U CN202021998818 U CN 202021998818U CN 214428341 U CN214428341 U CN 214428341U
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Abstract
The utility model belongs to the technical field of digital control, concretely relates to signal fast switching circuit for realizing protection system response time measurement, the fast switching circuit is built based on the relay, the response time measurement, the switching circuit function is to select the switching to the measuring circuit, the controlled end of the relay is the on-off of the metal switch, the control end is the electronic component, the control command signal is accessed, the fast action of the relay can be realized; the signal fast switching circuit is formed by modularization, cascading bridging and the like, so that fast and accurate switching of signals for measuring response time of a protection system is realized, the problems of low efficiency and high error rate in manual switching are solved, and the test efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of the digital control, concretely relates to realize protection system response time measuring signal fast switch over circuit.
Background
A nuclear power plant reactor protection system (hereinafter referred to as a protection system) performs threshold judgment, logic processing and the like by receiving the change of an upstream instrument signal, and triggers shutdown or starts a special safety facility to ensure the safety of a reactor. In order to ensure that the protection system can act in time under accident conditions, a nuclear power plant needs to periodically execute a response time measurement test at a debugging stage and a overhaul stage.
The response time of the protection system is about 200 input signals (including digital quantity and analog quantity), the response time of the protection system is about 100 output signals, the input signals are mainly distributed in four protection channels and two specially-arranged plants, the recorders are generally arranged in a computer room, and the number of the whole test cross plants is more than or equal to 7. The measurement response time needs to span plants to build a measurement cable, but due to the cable bridge capacity, fireproof holes between the plants and other reasons, only 1 cable is generally laid between every two plants in advance.
Response time measurement test takes response time measurement of three times of shutdown logic of voltage stabilizer pressure as an example. This test involves four parts: one channel RCS005MP trip response time, two channel RCS006MP trip response time, three channel RCS013MP trip response time, four channel RCS018MP trip response time.
One channel RCS005MP test: in the preparation stage, a channel cable 1 pair of cable cores is selected by the input of the computer room recorder, and the corresponding cable cores are accessed to an RCS005MP terminal row in the cabinet in a channel factory building; the output of the computer room recorder selects 1 pair of wire cores of four protection channel cables, and corresponding wire cores are respectively accessed to a shutdown signal terminal row in the channel cabinet in the four protection channel plants; and then triggering a test signal, recording response time, recovering the test signal and the like.
Two-channel RCS006MP test: in the preparation stage, the input of the computer room recorder is switched to the two-channel cable 1 pair of cable cores, and the corresponding cable cores are connected to the RCS006MP terminal strip in the cabinet in the two-channel factory building; the output wiring of the computer room recorder is kept consistent with a channel test. And then triggering a test signal, recording response time, recovering the test signal and the like.
The three-channel RCS013MP and four-channel RCS018MP test methods were similar to the two-channel.
It can be seen that the test of each logic needs the operation of multiple plants, multiple cables and multiple devices (cabinets, recorders, etc.), the testers cooperate with each other to manually switch the wiring, and the reactor protection system has tens of logics and corresponds to different input and output signals. The test needs a large amount of signal wiring switching, consumes a large amount of manpower and time resources, and has a large risk probability of test failure caused by miswiring.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above-mentioned drawback, provide a realize the measured signal fast switch-over circuit of protection system response time, constitute signal fast switch-over circuit through modes such as modularization, cascade bridging, realize that protection system response time measuring signal is quick, accurate to be switched over, the problem that inefficiency, error rate are high when solving the manual switch-over improves test efficiency.
The technical scheme of the utility model as follows:
a signal fast switching circuit for realizing measurement of response time of a protection system is built on the basis of a relay, the response time is measured, the switching circuit is used for selectively switching a measurement circuit, a controlled end of the relay is used for connection and disconnection of a metal switch, a control end of the relay is used for an electronic component and is connected with a control command signal, and fast action of the relay can be realized;
the 4 independent relays are respectively connected with the controlled loop in parallel to form 1 selection switch with 4 channels. And 4, 1 in 4-out-of-four signals can be realized through control instructions of the four relays.
The 4 relays are all switched off, the selector switch is in a working preparation state, and a non-selection signal is output;
the relay 1 is closed, other relays are opened, and the output of the selection switch selects the input signal 1;
the relay 2 is closed, other relays are opened, and the output of the selection switch selects the input signal 2;
the relay 3 is closed, other relays are opened, and the output of the selection switch selects the input signal 3;
the relay 4 is closed, other relays are opened, and the output of the selection switch selects the input signal 4;
the selection switch unit can correctly select the module only when 4 relays are simultaneously closed and only 1 relay is closed;
a4-to-1 selection switch is used as a modular switch, and a switching circuit with more selection and less selection can be realized through the cascade combination of a plurality of modular switches.
In the switching circuit which is a 16-to-1 fast switching circuit, 16 paths of inputs are classified into 4 groups: the first group is inputs 1-4, the second group is inputs 5-8, the third group is inputs 9-12, and the fourth group is inputs 13-16;
each group is switched by a modular switch for selecting a specific conducted signal line, the used modular switches are divided into two stages, the first stage is group selection for gating input of which group the output signals use, and the second stage is path selection for gating output of which group the signals use in each group of input signals; the 16-to-1 switching circuit is realized through a cascade mode of group selection and path selection of the modular switches.
When 1 of the 16 inputs is selected as the output, the relay contact of each stage of modular switch is closed, and the channel is bridged into a hard-wired path, so that a channel is provided for the input signal to be transmitted to the output;
the way-selected modular switch 1 is selected as input 1, namely the first group selects input 1 as output; the way-selected modular switch 2 selects as input 4, i.e. the second group selects input 4 as output; the way-selected modular switch 3 selects as input 9, i.e. the third group selects input 9 as output; the way-selected modular switch 4 is selected as input 13, i.e. the fourth group selects input 13 as output; and the group selected modular switch a is selected as the first group output, so the 16-to-1 fast switching circuit output selects the first group input 1.
The modular switch A for group selection is expanded to 4, and the signal switching of 16-to-4 can be realized.
Way selected modular switch 1 is selected as input 1, modular switch 2 is selected as input 4, modular switch 3 is selected as input 9, modular switch 4 is selected as input 13, and group selected modular switch a is selected as a first set of outputs, modular switch B is selected as a second set of outputs, modular switch C is selected as a third set of outputs, modular switch D is selected as a fourth set of outputs.
Through the modular switch and the cascade bridging of the relay, a 16-to-4 rapid switching circuit can be formed; the number of relays included in the modular switch can be changed according to different signal numbers of the protection system, so that switching combinations of 25-to-5, 36-to-6, 49-to-7, 64-to-8, 81-to-9, 100-to-10 and the like can be realized.
The utility model has the advantages that:
1) the signal fast switching circuit replaces manual repeated wire disconnecting through fast control of the circuit, so that labor and test time can be effectively saved, and test efficiency of response time measurement of the protection system is improved;
2) the signal fast switching circuit decomposes the time-consuming and repetitive disconnecting work in the test into one-time disconnecting work and fast switching work, the disconnecting work is prepared for the previous access of the test and is recovered for the next disconnecting work after the test, and the fast switching work is switched into the fast switching work through the switching circuit, so that the repetitive work of disconnecting work in the test is reduced.
3) The signal fast switching circuit is realized through a relay principle, the control end of the signal fast switching circuit is an electronic loop and can realize fast switching, the controlled end of the signal fast switching circuit is a metal switch contact, no electronic component exists, and the influence on the measurement result of the response time of the protection system caused by other time delay is avoided.
4) The signal fast switch circuit, every modular switch structure, function are unanimous, and are independent each other, and a trouble only influences partial signal, can not lead to whole circuit trouble, and can carry out the change of trouble unit alone.
5) The signal fast switching circuit has the advantages that through two-stage (group selection and path selection) bridging combination, a plurality of inputs can be simultaneously switched to a plurality of outputs for line connection, and signal selection capable of being measured simultaneously is provided for a protection system response time measurement test.
6) The signal fast switching circuit is composed of a plurality of modular switches for group selection, provides fault redundancy for group selection, increases reliability, also increases output lines, and can output a plurality of selection signals.
7) The circuit is switched fast to the signal, utilize characteristics such as test signal are many, the cable is few, the repeated wiring of tearing open is many, the facility can not increase time delay, fully match various restrictive conditions of nuclear power plant reactor protection system response time test, realize the key promotion of test efficiency.
Drawings
Fig. 1 is a schematic diagram of an automatic one-out-of-four switching circuit of the present invention;
fig. 2 is a schematic diagram of an automatic switching circuit for one out of sixteen of the present invention;
fig. 3 is a schematic diagram of the automatic switching circuit for selecting sixteen from four.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The measurement of the protection system response time mainly measures the response time of each protection system logic. The response time test of each logic needs to be accessed, one input signal of the logic is triggered to be the datum point of the start of time recording acquisition, and then the output signal of the logic is selected to be the datum point of the end of time recording acquisition.
The whole measuring process is mainly divided into two parts: signal switching and time measurement.
Signal switching: it takes about 10-30 minutes, depending on the number of switching signals and the difficulty of disconnecting and connecting the cabinet.
Measuring time: the time is about 1-2 minutes, and the device is used for triggering and recovering signals for multiple times and recording data of a recorder.
From the above empirical data, it can be known that the protection system is responsive to the operation of time testing, which is mainly used for switching signals. The difficulties of signal switching mainly include:
the test cables crossing the factory building are few;
the termination positions of the test cables of each factory building are more;
the switching operation is carried out in a plurality of plants;
signals accessed to the measurement at the same time are limited;
based on the characteristics, the efficiency of the test can be greatly improved by improving the signal switching link. A fast switching circuit can be added in each factory building, and the fast switching circuit mainly realizes the fast switching of more selection and less selection of signals.
As shown in the figure, the signal switching circuit is based on the principle that a relay control loop is isolated from a controlled loop, 4 relays are connected in parallel to form a modular switch, and then the modular switch is combined in a cascade mode to build a two-stage cascade circuit. The signal switching circuit sends a switch control command to each relay, each corresponding relay acts, a channel is bridged for the selected input path, and the selected input path is conducted to the output end, so that the signal rapid switching of the protection system response time measurement is realized.
The following is a specific circuit implementation:
the fast switching circuit is built based on a relay. The switching circuit is used for selectively switching the measuring line, and the part of the switching circuit connected to the measuring line cannot be provided with components with delayed response time, such as electronic components, and the like, and cannot influence the signal transmission time of the measured line. The controlled end of the relay is the on-off of the metal switch, the controlled end is connected with the measuring circuit and does not delay signals, and the controlled end of the relay is an electronic component and is connected with a control command signal, so that the rapid action of the relay (the action time of the controlled end is in millisecond level) can be realized.
And the multi-selection and multi-reduction switching of signals is realized through the parallel connection of the relays. As shown in fig. 1, 4 independent relays, their respective controlled loops, are connected in parallel to form 1 selection switch with 4 channels. And 4, 1 in 4-out-of-four signals can be realized through control instructions of the four relays. The concrete implementation is as follows:
4 relays are all switched off, the selector switch is in a working preparation state, and a non-selection signal is output;
the relay 1 is closed, other relays are opened, and the output of the selection switch selects the input signal 1;
the relay 2 is closed, other relays are opened, and the output of the selection switch selects the input signal 2;
the relay 3 is closed, other relays are opened, and the output of the selection switch selects the input signal 3;
the relay 4 is closed, other relays are opened, and the output of the selection switch selects the input signal 4;
4 relays are simultaneously closed and only 1 relay is closed, and the selection switch unit can correctly select the module.
A4-to-1 selection switch is used as a modular switch, and a switching circuit with more selection and less selection can be realized through the cascade combination of a plurality of modular switches. As shown in fig. 1, the circuit diagram of each 4-to-1 selection unit is simplified for the subsequent circuit diagram combination.
The selection of the plurality of signals is performed by grouping and ranking. As shown in fig. 2, in the 1-out-of-16 fast switching circuit, 16 inputs are classified into 4 groups: the first group is inputs 1-4, the second group is inputs 5-8, the third group is inputs 9-12, and the fourth group is inputs 13-16. Each group is switched by a modular switch for selecting a particular conducting signal line. The modular switch used is divided into two stages, the first stage is group selection and is used for gating input of which group the output signal uses, and the second stage is path selection and is used for gating output of which signal as a group in each group of input signals. The 16-to-1 switching circuit is realized through a cascade mode of group selection and path selection of the modular switches.
When 1 of the 16 inputs is selected as the output, the modular switch relay contacts of each stage close, "bridging" this path into a hardwired path, thereby providing a path for the input signal to travel to the output. As shown in fig. 2, the way-selected modular switch 1 is selected as input 1, i.e. the first group selects input 1 as output; the way-selected modular switch 2 selects as input 4, i.e. the second group selects input 4 as output; the way-selected modular switch 3 selects as input 9, i.e. the third group selects input 9 as output; the way-selected modular switch 4 is selected as input 13, i.e. the fourth group selects input 13 as output; and the group selected modular switch a is selected as the first group output, so the 16-to-1 fast switching circuit output selects the first group input 1.
As shown in fig. 3, the group-selected modular switch a is expanded to 4 in the same wiring manner, so that the signal switching of 16-to-4 can be realized. In fig. 3, way selected modular switch 1 is selected as input 1, modular switch 2 is selected as input 4, modular switch 3 is selected as input 9, modular switch 4 is selected as input 13, and group selected modular switch a is selected as a first set of outputs, modular switch B is selected as a second set of outputs, modular switch C is selected as a third set of outputs, and modular switch D is selected as a fourth set of outputs. This achieves: the signal switching selection of 16-to-4 is completed with the input 1 selected by the output 1, the input 5 selected by the output 2, the input 9 selected by the output 3, and the input 13 selected by the output 4.
A16-to-4 fast switching circuit is formed by modular switching and cascade bridging of relays. Different signal quantities of the protection systems of the nuclear power plants can change the quantity of relays contained in the modular switch, so that switching combinations of 5-by-25, 6-by-36, 7-by-49, 8-by-64, 9-by-81, 10-by-100 and the like can be realized, and the signals for measuring the response time of the protection systems of the nuclear power plants can be quickly switched.
The circuit is applied to the measurement of the response time of a protection system, and the rapid switching of signals can be realized. In the test of the response time measurement of the protection system, each factory building is provided with a quick switching circuit, the input end of the circuit is connected with all test signals of the factory building, and the output end of the circuit is connected with a cable which is crossed with the factory building and sent to a recorder. When the test is executed, the relay of the fast switching circuit is controlled to act, the output end is communicated to the required signal input end, and the signal is sent to the recorder for response time measurement. Taking the measurement of the response time of the input signal RCS005MP of one channel in the three-shutdown logic of the voltage stabilizer, during the measurement, the fast switching operation condition of the switching circuit in each plant is changed by inputting the fast switching command to the circuit:
a channel factory switching circuit: the output 1 fast switching circuit switches to the input signal-RCS 005MP, and the output 2 fast switches to the input signal-a channel trip signal;
two-channel factory building switching circuit: the output 2 fast switching circuit is switched to an input signal-two-channel shutdown signal;
three-channel factory building switching circuit: the output 2 fast switching circuit is switched to an input signal, namely a three-channel shutdown signal;
four-channel factory building switching circuit: the output 2 fast switching circuit is switched to an input signal, namely a four-channel shutdown signal;
switching a switching circuit of a computer room: to the output of a corresponding test signal to a test device such as a connection recorder.
After the rapid switching is completed, the injection of the signal generator and the circuit bridging of the recorder are completed, and then the trigger signal is injected through the signal generator, so that the response time of three times of the pressure rise of the RCS005MP voltage stabilizer can be obtained through the recorder.
The fast switching circuit based on modularization and cascade bridging combination realizes fast and accurate switching of a protection system, makes full use of the principle that circuit response time is fast, reduces switching time from 10-30 minutes (manual work) to within 1 second (circuit), and improves the efficiency of the measurement work of the response time of the protection system by multiple levels.
The present invention is described in detail with reference to the attached drawings, but the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and the scope of the present invention, which is protected by the claims.
Claims (7)
1. A signal fast switching circuit for realizing response time measurement of a protection system is characterized in that: the quick switching circuit is built based on the relay, response time is measured, the switching circuit is used for selectively switching a measuring circuit, the controlled end of the relay is used for switching on and off a metal switch, and the control end of the relay is used for connecting a control command signal to an electronic component, so that quick action of the relay can be realized;
the controlled loops of the 4 independent relays are connected in parallel to form 1 selection switch with 4 channels, and the control instruction of the four relays can realize the selection of 1 from 4 of signals.
2. A signal fast switching circuit for performing protection system response time measurement as recited in claim 1, wherein: the 4 relays are all switched off, the selector switch is in a working preparation state, and a non-selection signal is output;
the relay 1 is closed, other relays are opened, and the output of the selection switch selects the input signal 1;
the relay 2 is closed, other relays are opened, and the output of the selection switch selects the input signal 2;
the relay 3 is closed, other relays are opened, and the output of the selection switch selects the input signal 3;
the relay 4 is closed, other relays are opened, and the output of the selection switch selects the input signal 4;
the selection switch unit can correctly select the module only when 4 relays are simultaneously closed and only 1 relay is closed;
a4-to-1 selection switch is used as a modular switch, and a switching circuit with more selection and less selection can be realized through the cascade combination of a plurality of modular switches.
3. A signal fast switching circuit for performing protection system response time measurement as recited in claim 1, wherein: in the switching circuit which is a 16-to-1 fast switching circuit, 16 paths of inputs are classified into 4 groups: the first group is inputs 1-4, the second group is inputs 5-8, the third group is inputs 9-12, and the fourth group is inputs 13-16;
each group is switched by a modular switch for selecting a specific conducted signal line, the used modular switches are divided into two stages, the first stage is group selection for gating input of which group the output signals use, and the second stage is path selection for gating output of which group the signals use in each group of input signals; the 16-to-1 switching circuit is realized through a cascade mode of group selection and path selection of the modular switches.
4. A signal fast switching circuit for performing protection system response time measurement as claimed in claim 3, wherein: when 1 of the 16 inputs is selected as the output, the relay contact of each stage of modular switch is closed, and the channel is bridged into a hard-wired path, so that a channel is provided for the input signal to be transmitted to the output;
the way-selected modular switch 1 is selected as input 1, namely the first group selects input 1 as output; the way-selected modular switch 2 selects as input 4, i.e. the second group selects input 4 as output; the way-selected modular switch 3 selects as input 9, i.e. the third group selects input 9 as output; the way-selected modular switch 4 is selected as input 13, i.e. the fourth group selects input 13 as output; and the group selected modular switch a is selected as the first group output, so the 16-to-1 fast switching circuit output selects the first group input 1.
5. A signal fast switching circuit for performing protection system response time measurement as recited in claim 4 wherein: the modular switch A for group selection is expanded to 4, and the signal switching of 16-to-4 can be realized.
6. A signal fast switching circuit for performing protection system response time measurement as recited in claim 5, wherein: way selected modular switch 1 is selected as input 1, modular switch 2 is selected as input 4, modular switch 3 is selected as input 9, modular switch 4 is selected as input 13, and group selected modular switch a is selected as a first set of outputs, modular switch B is selected as a second set of outputs, modular switch C is selected as a third set of outputs, modular switch D is selected as a fourth set of outputs.
7. A signal fast switching circuit for performing protection system response time measurement as claimed in claim 3, wherein: through the modular switch and the cascade bridging of the relay, a 16-to-4 rapid switching circuit can be formed; the number of relays included in the modular switch can be changed according to different signal numbers of the protection system, so that switching combinations of 25-to-5, 36-to-6, 49-to-7, 64-to-8, 81-to-9, 100-to-10 and the like can be realized.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362785A (en) * | 2021-12-29 | 2022-04-15 | 贸联电子(昆山)有限公司 | High-frequency signal switching device and tester and test system with same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362785A (en) * | 2021-12-29 | 2022-04-15 | 贸联电子(昆山)有限公司 | High-frequency signal switching device and tester and test system with same |
| CN114362785B (en) * | 2021-12-29 | 2023-11-17 | 贸联电子(昆山)有限公司 | High-frequency signal switching device and tester and test system with same |
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