阅读说明：本技术 核电厂常规岛液位开关试验逻辑控制方法 (Logic control method for conventional island liquid level switch test of nuclear power plant ) 是由 刘立华 于 2020-11-19 设计创作，主要内容包括：本发明涉及核电厂蒸汽系统技术领域,公开了一种核电厂常规岛液位开关试验逻辑控制方法。该方法包括：在采用双控制站时,当满足以下第一双控条件：立柱A的第一继电器开关的第一继电采集信号为1、试验选择开关的第一采集信号为1、试验选择开关的第二采集信号为1,触发液位保护逻辑。本发明采用双重闭锁,可有效避免单一故障导致保护误动作,并实现对试验选择开关的完整监视,避免保护逻辑意外失效。(The invention relates to the technical field of steam systems of nuclear power plants, and discloses a logic control method for a conventional island liquid level switch test of a nuclear power plant. The method comprises the following steps: when the dual control station is adopted, the following first dual control condition is satisfied: a first relay acquisition signal of a first relay switch of the stand column A is 1, a first acquisition signal of the test selection switch is 1, a second acquisition signal of the test selection switch is 1, and liquid level protection logic is triggered. The invention adopts double locking, can effectively avoid protection misoperation caused by single fault, realizes complete monitoring of the test selection switch and avoids accidental failure of protection logic.)

1. A logic control method for a nuclear power plant conventional island liquid level switch test is characterized by comprising the following steps:

when the dual control station is adopted, the following first dual control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test selection switch is 1,

The second acquisition signal of the test selection switch is 1 after being inverted,

triggering the liquid level protection logic.

2. The nuclear power plant conventional island liquid level switch test logic control method of claim 1, further comprising:

when the following second dual control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The second acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

3. The nuclear power plant conventional island liquid level switch test logic control method of claim 1, further comprising:

when the following third dual-control condition is satisfied:

the second acquisition signal of the test select switch is 1, or,

the inverted value of the first acquisition signal and the inverted value of the second acquisition signal of the test selection switch are firstly subjected to logic and processing, and then the signal value after the first delay processing is 1, or,

the fourth acquisition signal of the test select switch is 1, or,

the inverted value of the third acquisition signal and the inverted value of the fourth acquisition signal of the test selection switch are firstly subjected to logic AND processing, and then the signal value after the second time delay processing is 1,

triggering the test switch state.

4. The nuclear power plant conventional island liquid level switch test logic control method of claim 1, further comprising:

when the following fourth dual-control condition is satisfied:

the second relay acquisition signal of the second relay switch of the upright post B is 1,

The third acquisition signal of the test selection switch is 1,

The fourth acquisition signal of the test selection switch is 1 after being inverted,

triggering the liquid level protection logic.

5. The nuclear power plant conventional island liquid level switch test logic control method of claim 1, further comprising:

when the following fifth double control condition is satisfied:

the second relay acquisition signal of the second relay switch of the upright post B is 1,

The fourth acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

6. The nuclear power plant conventional island liquid level switch test logic control method according to claim 3, wherein the delay time duration of the first delay process is 1 second;

the delay time of the second delay processing is 1 second.

7. A logic control method for a nuclear power plant conventional island liquid level switch test is characterized by comprising the following steps:

when a single control station is adopted, the following first single control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test selection switch is 1,

The second acquisition signal and/or the third acquisition signal of the test selection switch is 1,

triggering the liquid level protection logic.

8. The nuclear power plant conventional island liquid level switch test logic control method of claim 7, further comprising:

when the following second single control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

9. The nuclear power plant conventional island liquid level switch test logic control method of claim 7, further comprising:

when the following third single control condition is satisfied:

the inverted value of the third acquisition signal of the test selection switch, the signal value of the second acquisition signal and/or the first acquisition signal after time delay processing is 1,

triggering the test switch state.

10. The nuclear power plant conventional island liquid level switch test logic control method of claim 7, further comprising:

when the following fourth single control condition is satisfied:

the second acquisition signal of the second relay switch of the upright post B is 1,

The second acquisition signal of the test selection switch is 1,

The first acquisition signal and/or the third acquisition signal of the test selection switch is 1,

triggering the liquid level protection logic.

11. The nuclear power plant conventional island liquid level switch test logic control method of claim 7, further comprising:

when the following fifth single control condition is satisfied:

the second acquisition signal of the second relay switch of the upright post B is 1,

The second acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

12. The method for controlling the logic of the test of the conventional island liquid level switch of the nuclear power plant according to claim 9, wherein the time delay duration of the time delay processing is 1 second.

Technical Field

The invention relates to the technical field of steam systems of nuclear power plants, in particular to a logic control method for a conventional island liquid level switch test of a nuclear power plant.

Background

Systems such as a low-temperature heater, a high-temperature heater, a steam-water separation reheater and the like of a conventional island of a nuclear power plant generally adopt a magnetic induction liquid level switch (represented by SN) installed in a column for liquid level monitoring. Heater pillars are typically arranged in pairs to load the SN during power operation to ensure reliability of the SN.

However, in the conventional island system of the current in-service nuclear power generating unit, a Distributed Control System (DCS) is generally adopted except that a few old units adopt a relay loop. According to analysis of a relay loop of a reference power plant and configuration logic of a DCS, contact failure of a contact of a selection switch can occur, and misoperation risks exist in the SN test process. In addition, the existing logic control method has the risk of logic failure during the non-test period.

Disclosure of Invention

Therefore, in order to solve the technical problems, a logic control method for a test of a conventional island liquid level switch of a nuclear power plant is needed to be provided so as to solve the misoperation risk of the conventional island liquid level switch of the nuclear power plant.

A logic control method for a nuclear power plant conventional island liquid level switch test comprises the following steps:

when the dual control station is adopted, the following first dual control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test selection switch is 1,

The second acquisition signal of the test selection switch is 1 after being inverted,

triggering the liquid level protection logic.

Optionally, the method further includes:

when the following second dual control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The second acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

Optionally, the method further includes:

when the following third dual-control condition is satisfied:

the second acquisition signal of the test select switch is 1, or,

the inverted value of the first acquisition signal and the inverted value of the second acquisition signal of the test selection switch are firstly subjected to logic and processing, and then the signal value after the first delay processing is 1, or,

the fourth acquisition signal of the test select switch is 1, or,

the inverted value of the third acquisition signal and the inverted value of the fourth acquisition signal of the test selection switch are firstly subjected to logic AND processing, and then the signal value after the second time delay processing is 1,

triggering the test switch state.

Optionally, the method further includes:

when the following fourth dual-control condition is satisfied:

the second relay acquisition signal of the second relay switch of the upright post B is 1,

The third acquisition signal of the test selection switch is 1,

The fourth acquisition signal of the test selection switch is 1 after being inverted,

triggering the liquid level protection logic.

Optionally, the method further includes:

when the following fifth double control condition is satisfied:

the second relay acquisition signal of the second relay switch of the upright post B is 1,

The fourth acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

Optionally, the delay time of the first delay processing is 1 second;

the delay time of the second delay processing is 1 second.

A logic control method for a nuclear power plant conventional island liquid level switch test comprises the following steps:

when a single control station is adopted, the following first single control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test selection switch is 1,

The second acquisition signal and/or the third acquisition signal of the test selection switch is 1,

triggering the liquid level protection logic.

Optionally, the method further includes:

when the following second single control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

Optionally, the method further includes:

when the following third single control condition is satisfied:

the inverted value of the third acquisition signal of the test selection switch, the signal value of the second acquisition signal and/or the first acquisition signal after time delay processing is 1,

triggering the test switch state.

Optionally, the method further includes:

when the following fourth single control condition is satisfied:

the second acquisition signal of the second relay switch of the upright post B is 1,

The second acquisition signal of the test selection switch is 1,

The first acquisition signal and/or the third acquisition signal of the test selection switch is 1,

triggering the liquid level protection logic.

Optionally, the method further includes:

when the following fifth single control condition is satisfied:

the second acquisition signal of the second relay switch of the upright post B is 1,

The second acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

Optionally, the delay time of the delay processing is 1 second.

The invention adopts double locking, can effectively avoid protection misoperation caused by single fault, realizes complete monitoring of the test selection switch and avoids accidental failure of protection logic. The invention also provides a logic control method for acquiring the state signal of the test selection switch by adopting the double control stations at 4 points and a logic control method for acquiring the state signal of the test selection switch by adopting the single control station at 3 points.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic diagram of a logic control of a conventional island level switch test in a nuclear power plant when dual control stations are employed;

FIG. 2 is a schematic diagram of a DCS control station acquisition and configuration logic;

FIG. 3 is a schematic diagram of a logic control of a conventional island level switch test of a nuclear power plant when a single control station is employed;

FIG. 4 is a logic diagram of a heater column level switch;

fig. 5 is a schematic diagram of a relay hard-wired circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In one embodiment, a logic control method for a nuclear power plant conventional island liquid level switch test is provided. The method comprises the following steps:

when the dual control station is adopted, the following first dual control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test selection switch is 1,

The second acquisition signal of the test selection switch is 1 after being inverted,

triggering the liquid level protection logic.

As shown in fig. 1, fig. 1 is a schematic diagram of a logic control of a conventional island liquid level switch test of a nuclear power plant when a double control station is adopted. The dual control station includes a control station 1 and a control station 2. The double control stations can be divided into an acquisition module and a configuration control module. Wherein, the collection module can gather following signal:

a first relay collecting signal of the first relay switch is represented by 001SN and belongs to the control station 1 (since the first relay switch only collects one group of signals, 001SN may represent the first relay switch or the first relay collecting signal, and the following 002SN is the same);

a first acquisition signal of the test selection switch, denoted by 001CC1, belongs to the control station 1;

a second acquisition signal of the test selection switch, denoted by 001CC2, belongs to the control station 1;

a second relay acquisition signal of a second relay switch is represented by 001SN and belongs to the control station 2;

a third acquisition signal of the test selection switch, indicated by 001CC3, belongs to the control station 2;

the fourth acquisition signal of the test selection switch, indicated with 001CC4, belongs to the control station 2.

The configuration control module is used for triggering corresponding control operation according to the signals acquired by the acquisition module. The specific control operation comprises liquid level protection logic, liquid level switch triggering test indication and test switch state monitoring. The level protection logic may be a shorthand for level signal protection logic. The liquid level protection logic includes, but is not limited to, liquid level high protection logic, liquid level low protection logic. Here, fig. 1 provides only an example of a level high protection logic. The test selection switch includes three selection bits, TA, N and TB respectively. When the test selection switch is switched on at TA, the stand column A is in a test state; when the test selection switch is switched on at N, the test selection switch is in a normal operation state; when the test selection switch is switched on at TB, the stand column B is in a test state.

The first dual-control condition comprises:

sub-condition 1: the first relay acquisition signal of the first relay switch of the upright post A is 1,

Sub-condition 2: the first acquisition signal of the test selection switch is 1,

Sub-condition 3: the second acquisition signal of the test selection switch is 1 after being inverted.

And only when the three sub-conditions in the first dual-control condition are met, triggering liquid level protection logic, such as liquid level high protection logic and liquid level low protection logic. In one example, the high level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the fill rate, increasing the drain rate, and the like.

The logic control method provided by this embodiment adopts double-locking to avoid system malfunction caused by testing the selection switch (denoted by 001 CC) during testing. The protection logic of the liquid level (signal) of the upright post A increases a 001CC2 locking signal, double locking of 001CC1 and 001CC2 is achieved, and misoperation risks caused by single signal abnormality are avoided.

In one example, as shown in fig. 2, a schematic diagram of the acquisition and configuration logic of a DCS control station is shown. The DCS control station has the same acquisition module as the double control stations, but has different configuration control modules. The contact of the test selection switch may have abnormal functions, which may cause the signal collected by the collection module to be abnormal, and if the original signal is 1, the signal is 0 when the signal is abnormal.

When a first relay Switch (SN) of the upright post A is tested, after 001CC is cut to the TA position, 001CC1 is '0', and the liquid level protection logic of 001SN is locked; 001CC2 is "1", the 001SN test indicates logical commissioning; 001CC3 is '1', and the 002SN liquid level signal protection logic of the upright post B maintains the normal operation state; 001CC4 is "0" and the 002SN test indicates that the logic maintains the latch-up state.

When the contact of 001CC1 on 001CC is abnormal or the position of the connection wire of a DCS signal acquisition card (an acquisition device for acquiring each signal) is abnormal, the 001CC1 signal is changed into 1, if the upright post A is filled with water, the 001SN triggers a liquid level high signal, and the protection action is caused.

In the non-test state, 001CC is in the N position, 001CC1 and 001CC3 are both '1', 001CC2 and 001CC4 are both '0', namely the 001SN and 002SN signal protection logics are both in the commissioning state, and the test indication logic (including the liquid level switch test indication and the test switch state monitoring) is in the lockout state. If the 001CC1 signal abnormally flips to "0", the 001SN protection logic will be locked out and not discovered in time due to the absence of the alarm monitor signal.

Optionally, the method further includes:

when the following second dual control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The second acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

Understandably, the second dual-control condition includes two sub-conditions, respectively:

sub-condition 1, the second acquisition signal of the test select switch is 1,

sub-condition 2, trigger level switch test indication.

The liquid level switch test indication is triggered if and only if both sub-conditions of the second dual control condition are met. The level switch test indication indicates that the level switch is in test.

In the example of FIG. 1, when 001CC is switched to the TA position, a level switch test indication is triggered. At the moment, the test alarm occurs, and the test indicator lamp of the liquid level switch is lightened to indicate that the liquid level switch is in the test.

Optionally, the method further includes:

when the following third dual-control condition is satisfied:

the second acquisition signal of the test select switch is 1, or,

the inverted value of the first acquisition signal and the inverted value of the second acquisition signal of the test selection switch are firstly subjected to logic and processing, and then the signal value after the first delay processing is 1, or,

the fourth acquisition signal of the test select switch is 1, or,

the signal value of the third acquisition signal and the fourth acquisition signal of the test selection switch after the second time delay processing is 1,

triggering the test switch state.

Understandably, the third dual-control condition includes four sub-conditions, which are respectively:

sub-condition 1, the second acquisition signal of the test selection switch is 1;

sub-condition 2, the negation value of the first acquisition signal and the negation value of the second acquisition signal of the test selection switch are firstly subjected to logic and processing, and then the signal value after the first delay processing is 1;

sub-condition 3, the fourth acquisition signal of the test selection switch is 1;

and the signal value of the sub-condition 4, the third acquisition signal and the fourth acquisition signal of the test selection switch after the second time delay processing is 1.

When any one of the third dual-control conditions is met, the test switch state can be triggered. The state of triggering the test switch means that the liquid level switch is in a test state (the liquid level switch of the upright A or the upright B) at present.

In the example of fig. 1, 4 collected signals of 001CC are all brought into an alarm loop for monitoring, so that the 001CC state is completely monitored, and the liquid level protection logic is prevented from being failed due to signal abnormality.

Optionally, the method further includes:

when the following fourth dual-control condition is satisfied:

the second relay acquisition signal of the second relay switch of the upright post B is 1,

The third acquisition signal of the test selection switch is 1,

The fourth acquisition signal of the test selection switch is 1 after being inverted,

triggering the liquid level protection logic.

Understandably, the fourth dual-control condition includes the following three sub-conditions:

the sub-condition 1 is that a second relay acquisition signal of a second relay switch of the stand column B is 1;

sub-condition 2, the third acquisition signal of the test selection switch is 1;

and the fourth acquisition signal of the test selection switch is inverted to be 1 under the sub-condition 3.

And only when three sub-conditions in the fourth dual-control condition are met, triggering liquid level protection logic, such as liquid level high protection logic and liquid level low protection logic. In one example, the high level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the fill rate, increasing the drain rate, and the like.

In the example of fig. 1, the column B liquid level signal protection logic adds a 001CC4 latching signal, realizes 001CC3 and 001CC4 double latching, and avoids malfunction risks caused by single signal abnormality.

Optionally, the method further includes:

when the following fifth double control condition is satisfied:

the second relay acquisition signal of the second relay switch of the upright post B is 1,

The fourth acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

Understandably, the fifth dual-control condition includes two sub-conditions, which are respectively:

sub-condition 1: a second relay acquisition signal of a second relay switch of the stand column B is 1;

sub-condition 2: the fourth acquisition signal of the test selection switch is 1.

And only when two sub-conditions in the fifth dual-control condition are met, triggering the liquid level switch test indication. Likewise, a level switch test indication indicates that the level switch is in test.

In the example of FIG. 1, when 001CC is switched to the TB position, a level switch test indication is triggered. At the moment, the test alarm occurs, and the test indicator lamp of the liquid level switch is lightened to indicate that the liquid level switch is in the test.

Optionally, the delay time of the first delay processing is 1 second;

the delay time of the second delay processing is 1 second.

Understandably, the delay time lengths of the first delay processing and the second delay processing can be set according to actual needs. In one example, the delay time lengths of the first delay processing and the second delay processing are each set to 1 second.

In the example of fig. 1, when 001CC is switched to the N position, if 001CC1 or 001CC3 is abnormally changed to "0", a malfunction alarm occurs. And a 1s time delay is set, so that a CC switching process flash signal can be shielded.

As shown in fig. 3, an embodiment of the present invention further provides a logic control method for a test of a conventional island liquid level switch in a nuclear power plant, including:

when a single control station is adopted, the following first single control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test selection switch is 1,

The second acquisition signal and/or the third acquisition signal of the test selection switch is 1,

triggering the liquid level protection logic.

In this embodiment, fig. 3 is a schematic diagram of a logic control of a conventional island liquid level switch test of a nuclear power plant when a single control station is adopted. The single control station can be divided into an acquisition module and a configuration control module. Wherein, the collection module can gather following signal:

a first relay collecting signal of the first relay switch is represented by 001SN and belongs to the control station 1 (since the first relay switch only collects one group of signals, 001SN may represent the first relay switch or the first relay collecting signal, and the following 002SN is the same);

a first acquisition signal of the test select switch, denoted 001CC 1;

a second acquisition signal of the test select switch, denoted as 001CC 2;

a second relay acquisition signal of the second relay switch is represented by 001 SN;

the third acquisition signal of the test select switch is denoted as 001CC 3.

The configuration control module is used for triggering corresponding control operation according to the signals acquired by the acquisition module. The specific control operation comprises liquid level protection logic, liquid level switch triggering test indication and test switch state monitoring. The level protection logic may be a shorthand for level signal protection logic. The liquid level protection logic includes, but is not limited to, liquid level high protection logic, liquid level low protection logic. Here, fig. 3 provides only an example of a level high protection logic. The test selection switch includes three selection bits, TA, N and TB respectively. When the test selection switch is switched on at TA, the stand column A is in a test state; when the test selection switch is switched on at N, the test selection switch is in a normal operation state; when the test selection switch is switched on at TB, the stand column B is in a test state.

The first single control condition comprises:

sub-condition 1: the first relay acquisition signal of the first relay switch of the upright post A is 1,

Sub-condition 2: the first acquisition signal of the test selection switch is 1,

Sub-condition 3: the second acquisition signal and/or the third acquisition signal of the test selection switch is 1.

And only when the three sub-conditions in the first single control condition are all met, triggering liquid level protection logic, such as liquid level high protection logic and liquid level low protection logic. In one example, the high level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the fill rate, increasing the drain rate, and the like.

In the logic control method provided by this embodiment, when 001CC is located at TA position, 001CC1 is 1, 001CC2 and 001CC3 are 0, the column a test indicates that the loop is in operation, and 001CC1 and (001CC2+001CC3) signals lock the column a liquid level control signal in a dual-locking manner, so as to avoid false operation caused by single failure of test selection CC; the test of the column B indicates that the loop is closed, and the liquid level of the column B controls the logic operation.

As shown in FIG. 4, in one example, FIG. 4 is a logic diagram of a heater column level switch. The conventional island low-pressure heater, high-pressure heater, steam-water separation reheater and other systems of the nuclear power plant are provided with columns in pairs, such as column A and column B. Each upright post is provided with a plurality of magnetic induction SN which respectively correspond to the monitoring of the height, height and the like of the liquid level. The local control Box (BM) is provided with 1 multi-position test selection switch (CC), and takes 3 position selection switches as examples, and the positions are respectively 'upright column A Test (TA)', 'N' and 'upright column B Test (TB)'.

In a non-test state, the 001CC switch is in an 'N' position, the liquid level switches on the upright A and the upright B are in a normal operation state, and the SN test loop is in a locking state.

Taking 001SN on the pillar a as an example, the test procedure is as follows: firstly, locking the SN protection logic function on the upright post A when the 001CC is in the TA position, commissioning an SN test indication loop, and simultaneously, monitoring and alarming when the SN is in a test state in a main control room; secondly, the upright post A is charged and drained, and the normal action of the upright post A is confirmed through an SN test indicator lamp; thirdly, the stand column is recovered on line, and the SN on the stand column A is confirmed to be recovered to a normal state through an SN test indicator lamp; and fourthly, recovering the 001CC to the N position and finishing the 001SN liquid level switch test.

In the test process of the upright A, the SN function on the upright B is not affected.

The logic implementation of the conventional island SN of the nuclear power plant mainly has 2 ways: the relay hard-wired logic and the DCS control station software configuration logic.

As shown in fig. 5, fig. 5 is a schematic diagram of a hard-wired relay circuit. The post 001/002SN transmits the switching value signal to the protective relay 001/002XR via 001 CC. When the 001CC is at the N or TB position, the 001SN on the upright A is communicated with the 001XR, and the 001SN protection logic takes effect; when 001CC switches to TA position, the passage of 001SN and 001XR is cut off, and the 001LA loop of the test indicator lamp is connected.

Similarly, when 001CC is at N or TA position, 002SN on the upright post B is communicated with 002XR, and 002SN protection logic takes effect; when 001CC is switched to TB position, the 002SN and 002XR paths are cut off, and the 002LA loop of the test indicator lamp is communicated.

When 001CC is at TA or TB position, the monitoring relay 003XR with SN in test state is excited, and the main control room generates a monitoring alarm to indicate that SN test is being carried out.

Under the non-test state, if the contact failure occurs on the N position contact of 001CC, the SN signal can not be normally communicated with 001XR or 002XR, so that the protection failure is caused, and the monitoring alarm of the protection failure is lacked and can not be found. During the test, taking the SN test of the pillar a as an example, if the contacts connected with 001SN and 001XR on 001CC are accidentally closed, the protection may be abnormally operated.

From the operation experience of a nuclear power plant, the reliability of a hard-wired loop of the relay is high; but the contact of the 001CC contact in a non-test state is poor, so that the protection is failed. And 001CC is lack of monitoring, so that certain potential safety hazard exists.

The logic control method provided by the embodiment can solve the hidden troubles.

Optionally, the method further includes:

when the following second single control condition is satisfied:

the first relay acquisition signal of the first relay switch of the upright post A is 1,

The first acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

In this embodiment, the first dual-control condition includes two sub-conditions, which are respectively:

sub-condition 1, the first relay acquisition signal of the first relay switch of the column a is 1,

sub-condition 2, the first acquisition signal of the test select switch is 1.

And triggering the liquid level switch test indication if and only if the two sub-conditions of the second single control condition are both satisfied. The level switch test indication indicates that the level switch is in test.

In the example of FIG. 3, a level switch test indication is triggered when 001CC is shifted to the TA position. At the moment, the test alarm occurs, and the test indicator lamp of the liquid level switch is lightened to indicate that the liquid level switch is in the test.

Optionally, the method further includes:

when the following third single control condition is satisfied:

the inverted value of the third acquisition signal of the test selection switch, the signal value of the second acquisition signal and/or the first acquisition signal after time delay processing is 1,

triggering the test switch state.

In this embodiment, the third single control condition includes: the inverted value of the third acquisition signal of the test selection switch, and the signal value of the second acquisition signal and/or the first acquisition signal after delay processing are 1. That is, as long as the signal value of any one of the inverted values of the first collected signal, the second collected signal, and the third collected signal is 1, the test switch state can be triggered. The state of triggering the test switch means that the liquid level switch is in a test state (the liquid level switch of the upright A or the upright B) at present.

In the example of fig. 3, when the 001CC is switched to the N position, if the 001CC3 becomes abnormal to "0", a malfunction alarm occurs. And a 1s time delay is set, so that a CC switching process flash signal can be shielded.

Optionally, the method further includes:

when the following fourth single control condition is satisfied:

the second acquisition signal of the second relay switch of the upright post B is 1,

The second acquisition signal of the test selection switch is 1,

The first acquisition signal and/or the third acquisition signal of the test selection switch is 1,

triggering the liquid level protection logic.

In this embodiment, the fourth single control condition includes the following three sub-conditions:

the sub-condition 1 is that a second relay acquisition signal of a second relay switch of the stand column B is 1;

sub-condition 2, negation of the second acquisition signal of the test selection switch is 1;

sub-condition 3, the first acquisition signal and/or the third acquisition signal of the test selection switch is 1.

And only when three sub-conditions in the fourth single control condition are met, triggering liquid level protection logic, such as liquid level high protection logic and liquid level low protection logic. In one example, the high level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the fill rate, increasing the drain rate, and the like.

In the example of fig. 3, when 001CC is in TB position, 001CC1, 001CC3 are 0, 001CC2 is 1, column B test indicates circuit commissioning, 001CC2 and (001CC1+001CC3) signal double latch column B level control signal to avoid false action caused by single fault of test selection CC; the test of the stand column A indicates that the loop is closed, and the liquid level of the stand column A controls logic operation.

Optionally, the method further includes:

when the following fifth single control condition is satisfied:

the second acquisition signal of the second relay switch of the upright post B is 1,

The second acquisition signal of the test select switch is 1,

and triggering a liquid level switch test indication.

In this embodiment, the fifth single control condition includes two sub-conditions, which are respectively:

sub-condition 1: a second relay acquisition signal of a second relay switch of the stand column B is 1;

sub-condition 2: the second acquisition signal of the test selection switch is 1.

And only when two sub-conditions in the fifth single control condition are met, triggering the liquid level switch test indication. Likewise, a level switch test indication indicates that the level switch is in test.

In the example of FIG. 3, when 001CC is switched to the TB position, a level switch test indication is triggered. At the moment, the test alarm occurs, and the test indicator lamp of the liquid level switch is lightened to indicate that the liquid level switch is in the test.

Optionally, the delay time of the delay processing is 1 second.

In this embodiment, the delay duration of the delay processing may be set according to actual needs. In one example, the delay time duration of the delay process may be set to 1 second.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.