Logic control method for test of liquid level switch in conventional island of nuclear power plant

Abstract

The present invention relates to the technical field of nuclear power plant steam system, and discloses a test logic control method for a conventional island liquid level switch of a nuclear power plant. The method comprises: when a dual control station is used, when the following first dual control condition is met: the first relay acquisition signal of the first relay switch of column A is 1, the first acquisition signal of the test selection switch is 1, and the second acquisition signal of the test selection switch is 1, the liquid level protection logic is triggered. The present invention adopts double interlocking, which can effectively avoid malfunction of protection caused by a single fault, and realizes complete monitoring of the test selection switch, avoiding accidental failure of the protection logic.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant steam systems, and in particular to a conventional island liquid level switch test logic control method for a nuclear power plant. Background Art

[0002] The low temperature heater, high temperature heater, steam-water separator reheater and other systems of the conventional island of nuclear power plants generally use column-mounted magnetic induction liquid level switches (denoted by SN) for liquid level monitoring. Heater columns are usually configured in pairs so that SN can be tested with load during power operation to ensure the reliability of SN.

[0003] However, the conventional island systems of nuclear power units currently in service generally use distributed control systems (DCS), except for a few old units that use relay circuits. After analysis based on the relay circuits and DCS system configuration logic of the power plant, the contacts of the selector switch may have poor contact, resulting in the risk of false operation during the SN test process. In addition, the existing logic control method also has the risk of logic failure during the non-test period. Summary of the invention

[0004] Based on this, it is necessary to provide a test logic control method for a conventional island liquid level switch in a nuclear power plant in response to the above technical problems, so as to solve the risk of false operation of the conventional island liquid level switch in a nuclear power plant.

[0005] A test logic control method for a conventional island liquid level switch in a nuclear power plant, comprising:

[0006] When dual control stations are used, the following first dual control condition is met:

[0007] The first relay acquisition signal of the first relay switch of column A is 1,

[0008] The first acquisition signal of the test selection switch is 1,

[0009] The second acquisition signal of the test selection switch is inverted to 1.

[0010] Trigger the liquid level protection logic.

[0011] Optionally, also include:

[0012] When the following second dual control conditions are met:

[0013] The first relay acquisition signal of the first relay switch of column A is 1,

[0014] The second acquisition signal of the test selection switch is 1,

[0015] Trigger the liquid level switch test indication.

[0016] Optionally, also include:

[0017] When the following third dual control conditions are met:

[0018] The second acquisition signal of the test selection switch is 1, or,

[0019] The inverted value of the first acquisition signal and the inverted value of the second acquisition signal of the test selection switch are first processed by logic AND, and then the signal value after the first delay processing is 1, or,

[0020] The fourth acquisition signal of the test selection switch is 1, or,

[0021] The inverted value of the third acquisition signal and the inverted value of the fourth acquisition signal of the test selection switch are first processed by logic AND, and then the signal value after the second delay processing is 1.

[0022] Trigger test switch state.

[0023] Optionally, also include:

[0024] When the following fourth dual control condition is met:

[0025] The second relay acquisition signal of the second relay switch of column B is 1,

[0026] The third acquisition signal of the test selection switch is 1,

[0027] The fourth acquisition signal of the test selection switch is inverted to 1.

[0028] Trigger the liquid level protection logic.

[0029] Optionally, also include:

[0030] When the following fifth dual control condition is met:

[0031] The second relay acquisition signal of the second relay switch of column B is 1,

[0032] The fourth acquisition signal of the test selection switch is 1,

[0033] Trigger the liquid level switch test indication.

[0034] Optionally, the delay duration of the first delay processing is 1 second;

[0035] The delay duration of the second delay processing is 1 second.

[0036] A test logic control method for a conventional island liquid level switch in a nuclear power plant, comprising:

[0037] When a single control station is used, the following first single control condition is met:

[0038] The first relay acquisition signal of the first relay switch of column A is 1,

[0039] The first acquisition signal of the test selection switch is inverted to 1,

[0040] The second acquisition signal and / or the third acquisition signal of the test selection switch is 1,

[0041] Trigger the liquid level protection logic.

[0042] Optionally, also include:

[0043] When the following second single control conditions are met:

[0044] The first relay acquisition signal of the first relay switch of column A is 1,

[0045] The first acquisition signal of the test selection switch is 1.

[0046] Trigger the liquid level switch test indication.

[0047] Optionally, also include:

[0048] When the following third-order control conditions are met:

[0049] 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 delay processing is 1,

[0050] Trigger test switch state.

[0051] Optionally, also include:

[0052] When the following fourth single control conditions are met:

[0053] The second acquisition signal of the second relay switch of column B is 1,

[0054] The second acquisition signal of the test selection switch is inverted to 1,

[0055] The first acquisition signal and / or the third acquisition signal of the test selection switch is 1,

[0056] Trigger the liquid level protection logic.

[0057] Optionally, also include:

[0058] When the following fifth single control conditions are met:

[0059] The second acquisition signal of the second relay switch of column B is 1,

[0060] The second acquisition signal of the test selection switch is 1,

[0061] Trigger the liquid level switch test indication.

[0062] Optionally, the delay duration of the delay processing is 1 second.

[0063] The present invention adopts double interlocking, which can effectively avoid malfunction of protection caused by a single fault, and realizes complete monitoring of the test selection switch to avoid accidental failure of protection logic. The present invention also provides a logic control method for collecting test selection switch status signals at 4 points using a dual control station, and a logic control method for collecting test selection switch status signals at 3 points using a single control station. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0065] Figure 1 This is a schematic diagram of the logic control of the conventional island liquid level switch test in a nuclear power plant when dual control stations are used;

[0066] Figure 2 It is a DCS control station acquisition and configuration logic schematic diagram;

[0067] Figure 3 This is a schematic diagram of the test logic control of the conventional island liquid level switch of a nuclear power plant when a single control station is used;

[0068] Figure 4 This is a logic diagram of the heater column level switch;

[0069] Figure 5 Schematic diagram of the relay hard wiring circuit. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] In one embodiment, a method for controlling the test logic of a conventional island liquid level switch in a nuclear power plant is provided. The method comprises:

[0072] When dual control stations are used, the following first dual control condition is met:

[0073] The first relay acquisition signal of the first relay switch of column A is 1,

[0074] The first acquisition signal of the test selection switch is 1,

[0075] The second acquisition signal of the test selection switch is inverted to 1.

[0076] Trigger the liquid level protection logic.

[0077] like Figure 1 As shown, Figure 1 This is a schematic diagram of the logic control of the conventional island liquid level switch test in a nuclear power plant when dual control stations are used. The dual control station includes control station 1 and control station 2. The dual control station can be divided into an acquisition module and a configuration control module. Among them, the acquisition module can collect the following signals:

[0078] The first relay acquisition signal of the first relay switch is represented by 001SN, which belongs to control station 1 (since the first relay switch only collects one group of signals, 001SN can represent both the first relay switch and the first relay acquisition signal, and the same applies to the following 002SN);

[0079] The first acquisition signal of the test selection switch is represented by 001CC1 and belongs to control station 1;

[0080] The second acquisition signal of the test selection switch is represented by 001CC2 and belongs to control station 1;

[0081] The second relay acquisition signal of the second relay switch is represented by 001SN and belongs to control station 2;

[0082] The third acquisition signal of the test selection switch is represented by 001CC3 and belongs to control station 2;

[0083] The fourth acquisition signal of the test selection switch is represented by 001CC4 and belongs to control station 2.

[0084] The configuration control module is used to trigger corresponding control operations according to the signals collected by the acquisition module. Specific control operations include liquid level protection logic, triggering liquid level switch test indication, and test switch status monitoring. Liquid level protection logic can be abbreviated as liquid level signal protection logic. Liquid level protection logic includes but is not limited to liquid level high protection logic and liquid level low protection logic. Here, Figure 1 Only an example of high liquid level protection logic is provided. The test selection switch includes three selection positions, namely TA, N and TB. When the test selection switch is turned on to TA, column A is in the test state; when the test selection switch is turned on to N, it is in the normal operation state; when the test selection switch is turned on to TB, column B is in the test state.

[0085] The first dual control conditions include:

[0086] Sub-condition 1: The first relay acquisition signal of the first relay switch of column A is 1.

[0087] Sub-condition 2: The first acquisition signal of the test selection switch is 1.

[0088] Sub-condition 3: The second acquisition signal of the test selection switch is inverted to 1.

[0089] Only when all three sub-conditions in the first dual control condition are met, the liquid level protection logic, such as the high liquid level protection logic and the low liquid level protection logic, is triggered. In one example, the high liquid level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the filling rate, increasing the drainage rate, etc.

[0090] The logic control method provided in this embodiment adopts double interlocking to avoid the test selection switch (indicated by 001CC) causing system malfunction during the test. Among them, the column A liquid level (signal) protection logic adds 001CC2 interlocking signal to achieve double interlocking of 001CC1 and 001CC2 to avoid the risk of malfunction caused by a single signal abnormality.

[0091] In one example, if Figure 2 The figure shows a DCS control station acquisition and configuration logic diagram. The acquisition module of this DCS control station is the same as that of the dual control station, but the configuration control module is different. The contact of the test selection switch may have malfunction, resulting in abnormal signals collected by the acquisition module. For example, the original signal is 1, but it is 0 when it is abnormal.

[0092] When testing the first relay switch (SN) of column A, after switching 001CC to the TA position, 001CC1 is "0", locking the liquid level protection logic of 001SN; 001CC2 is "1", and the 001SN test indication logic is put into operation; 001CC3 is "1", and the 002SN liquid level signal protection logic of column B maintains the normal operation state; 001CC4 is "0", and the 002SN test indication logic maintains the locked state.

[0093] When the contact of 001CC1 on 001CC is abnormal, or the wiring to the DCS signal acquisition card (the acquisition device used to collect various signals) is abnormal, the 001CC1 signal becomes "1". If column A is filled with water at this time, 001SN will trigger a high liquid level signal, which will cause protection action.

[0094] In the non-test state, 001CC is in the N position, 001CC1 and 001CC3 are both "1", 001CC2 and 001CC4 are both "0", that is, 001SN and 002SN signal protection logic are both in operation, and the test indication logic (including liquid level switch test indication and test switch status monitoring) is in the locked state. If the 001CC1 signal abnormally flips to "0", the 001SN protection logic will be locked, and it cannot be discovered in time due to the lack of alarm monitoring signal.

[0095] Optionally, also include:

[0096] When the following second dual control conditions are met:

[0097] The first relay acquisition signal of the first relay switch of column A is 1,

[0098] The second acquisition signal of the test selection switch is 1,

[0099] Trigger the liquid level switch test indication.

[0100] It can be understood that the second dual control condition includes two sub-conditions, namely:

[0101] Sub-condition 1: The second acquisition signal of the test selection switch is 1.

[0102] Sub-condition 2: triggering the liquid level switch test indication.

[0103] If and only if both sub-conditions of the second dual control condition are satisfied, the liquid level switch test indication is triggered. The liquid level switch test indication indicates that the liquid level switch is under test.

[0104] exist Figure 1 In the example, when 001CC switches to the TA position, the level switch test indication is triggered. At this time, a test alarm appears and the level switch test indicator lights up, indicating that the level switch is under test.

[0105] Optionally, also include:

[0106] When the following third dual control conditions are met:

[0107] The second acquisition signal of the test selection switch is 1, or,

[0108] The inverted value of the first acquisition signal and the inverted value of the second acquisition signal of the test selection switch are first processed by logic AND, and then the signal value after the first delay processing is 1, or,

[0109] The fourth acquisition signal of the test selection switch is 1, or,

[0110] The signal values ​​of the third acquisition signal and the fourth acquisition signal of the test selection switch after the second delay processing are 1.

[0111] Trigger test switch state.

[0112] It can be understood that the third dual control condition includes four sub-conditions, namely:

[0113] Sub-condition 1: the second acquisition signal of the test selection switch is 1;

[0114] Sub-condition 2: the inverted value of the first acquisition signal and the inverted value of the second acquisition signal of the test selection switch are firstly processed by logical AND, and then the signal value after the first delay processing is 1;

[0115] Sub-condition 3: the fourth acquisition signal of the test selection switch is 1;

[0116] Sub-condition 4: the signal values ​​of the third acquisition signal and the fourth acquisition signal of the test selection switch after the second delay processing are 1.

[0117] When any one of the sub-conditions in the third dual control condition is met, the test switch state can be triggered. Triggering the test switch state means that there is currently a liquid level switch in the test state (it can be the liquid level switch of column A or column B).

[0118] exist Figure 1 In the example, the four collected signals of 001CC are all included in the alarm circuit for monitoring, so as to realize the complete monitoring of the status of 001CC and avoid the failure of liquid level protection logic due to abnormal signals.

[0119] Optionally, also include:

[0120] When the following fourth dual control condition is met:

[0121] The second relay acquisition signal of the second relay switch of column B is 1,

[0122] The third acquisition signal of the test selection switch is 1,

[0123] The fourth acquisition signal of the test selection switch is inverted to 1.

[0124] Trigger the liquid level protection logic.

[0125] It can be understood that the fourth dual control condition includes the following three sub-conditions:

[0126] Sub-condition 1: the second relay acquisition signal of the second relay switch of column B is 1;

[0127] Sub-condition 2: the third acquisition signal of the test selection switch is 1;

[0128] Sub-condition 3: the fourth acquisition signal of the test selection switch is inverted to 1.

[0129] Only when all three sub-conditions in the fourth dual control condition are met, the liquid level protection logic, such as the high liquid level protection logic and the low liquid level protection logic, is triggered. In one example, the high liquid level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the filling rate, increasing the drainage rate, etc.

[0130] exist Figure 1In the example, the column B liquid level signal protection logic adds the 001CC4 locking signal to achieve double locking of 001CC3 and 001CC4, avoiding the risk of false operation caused by a single signal abnormality.

[0131] Optionally, also include:

[0132] When the following fifth dual control condition is met:

[0133] The second relay acquisition signal of the second relay switch of column B is 1,

[0134] The fourth acquisition signal of the test selection switch is 1,

[0135] Trigger the liquid level switch test indication.

[0136] It can be understood that the fifth dual control condition includes two sub-conditions, namely:

[0137] Sub-condition 1: The second relay acquisition signal of the second relay switch of column B is 1;

[0138] Sub-condition 2: The fourth acquisition signal of the test selection switch is 1.

[0139] Only when both sub-conditions in the fifth dual control condition are satisfied, the liquid level switch test indication is triggered. Similarly, the liquid level switch test indication indicates that the liquid level switch is under test.

[0140] exist Figure 1 In the example, when 001CC is switched to the TB position, the level switch test indication is triggered. At this time, a test alarm appears and the level switch test indicator lights up, indicating that the level switch is under test.

[0141] Optionally, the delay duration of the first delay processing is 1 second;

[0142] The delay duration of the second delay processing is 1 second.

[0143] It is understandable that the delay durations of the first delay process and the second delay process can be set according to actual needs. In one example, the delay durations of the first delay process and the second delay process are both set to 1 second.

[0144] exist Figure 1 In the example, when 001CC switches to the N position, if 001CC1 or 001CC3 changes to "0" due to an abnormality, a fault alarm will occur. Setting a 1s delay can shield the flashing signal during the CC switching process.

[0145] like Figure 3 As shown, the embodiment of the present invention also provides a conventional island liquid level switch test logic control method for a nuclear power plant, comprising:

[0146] When a single control station is used, the following first single control condition is met:

[0147] The first relay acquisition signal of the first relay switch of column A is 1,

[0148] The first acquisition signal of the test selection switch is inverted to 1,

[0149] The second acquisition signal and / or the third acquisition signal of the test selection switch is 1,

[0150] Trigger the liquid level protection logic.

[0151] In this embodiment, Figure 3 This is a schematic diagram of the logic control of the conventional island liquid level switch test in a nuclear power plant when a single control station is used. The single control station can be divided into an acquisition module and a configuration control module. Among them, the acquisition module can collect the following signals:

[0152] The first relay acquisition signal of the first relay switch is represented by 001SN, which belongs to control station 1 (since the first relay switch only collects one group of signals, 001SN can represent both the first relay switch and the first relay acquisition signal, and the same applies to the following 002SN);

[0153] The first acquisition signal of the test selection switch is represented by 001CC1;

[0154] The second acquisition signal of the test selection switch is represented by 001CC2;

[0155] The second relay acquisition signal of the second relay switch is represented by 001SN;

[0156] The third acquisition signal of the test selection switch is represented by 001CC3.

[0157] The configuration control module is used to trigger corresponding control operations according to the signals collected by the acquisition module. Specific control operations include liquid level protection logic, triggering liquid level switch test indication, and test switch status monitoring. Liquid level protection logic can be abbreviated as liquid level signal protection logic. Liquid level protection logic includes but is not limited to liquid level high protection logic and liquid level low protection logic. Here, Figure 3 Only an example of high liquid level protection logic is provided. The test selection switch includes three selection positions, namely TA, N and TB. When the test selection switch is turned on to TA, column A is in the test state; when the test selection switch is turned on to N, it is in the normal operation state; when the test selection switch is turned on to TB, column B is in the test state.

[0158] The first single control conditions include:

[0159] Sub-condition 1: The first relay acquisition signal of the first relay switch of column A is 1.

[0160] Sub-condition 2: The first acquisition signal of the test selection switch is inverted to 1.

[0161] Sub-condition 3: The second acquisition signal and / or the third acquisition signal of the test selection switch is 1.

[0162] Only when all three sub-conditions in the first single control condition are met, the liquid level protection logic, such as the high liquid level protection logic and the low liquid level protection logic, is triggered. In one example, the high liquid level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the filling rate, increasing the drainage rate, etc.

[0163] The logic control method provided in this embodiment is that when 001CC is set to TA position, 001CC1 is 1, 001CC2 and 001CC3 are 0, the column A test indication circuit is put into operation, and 001CC1 and (001CC2+001CC3) signals doubly lock the column A liquid level control signal to avoid malfunction caused by a single failure of the test selection CC; the column B test indication circuit is locked, and the column B liquid level control logic is put into operation.

[0164] like Figure 4 As shown, in one example, Figure 4 The following is a logic diagram of the heater column type liquid level switch. The conventional island low-pressure heater, high-pressure heater, steam-water separator reheater and other systems of the nuclear power plant are equipped with columns in pairs, such as column A and column B. Each column is equipped with multiple magnetic induction SNs, corresponding to the high-high, high, and low liquid level monitoring. The local control box (BM) is equipped with a multi-position test selection switch (CC). Taking the three-position selection switch as an example, its positions are "column A test (TA)", "N", and "column B test (TB)".

[0165] In the non-test state, the 001CC switch is in the "N" position, the liquid level switches on columns A and B are in normal operation, and the SN test circuit is in a locked state.

[0166] Taking 001SN on column A as an example, the test process is as follows: ① Move 001CC to the "TA" position, lock the SN protection logic function on column A, and put the SN test indication circuit into operation. At the same time, a monitoring alarm indicating that SN is in the test state appears in the main control room; ② Fill and drain column A, and confirm its normal operation through the SN test indicator light; ③ Restore the column online, and confirm that the SN on column A has returned to normal through the SN test indicator light; ④ Restore 001CC to the "N" position to end the 001SN liquid level switch test.

[0167] During the test of column A, the SN function on column B is not affected.

[0168] There are two main ways to realize the logic of the conventional island SN of a nuclear power plant: relay hard-wired logic and DCS control station software configuration logic.

[0169] like Figure 5 As shown, Figure 5 The diagram is a schematic diagram of the relay hard wiring circuit. 001 / 002SN on the column transmits the switch signal to the protection relay 001 / 002XR through 001CC. When 001CC is in the N or TB position, 001SN on column A is connected with 001XR, and the protection logic of 001SN takes effect; when 001CC is switched to the TA position, the path between 001SN and 001XR is cut off, and the test indicator light 001LA circuit is connected.

[0170] Similarly, when 001CC is in the N or TA position, 002SN on column B is connected with 002XR, and the 002SN protection logic takes effect; when 001CC is switched to the TB position, the path between 002SN and 002XR is cut off, and the test indicator light 002LA circuit is connected.

[0171] When 001CC is in the TA or TB position, the monitoring relay 003XR of the SN in test state is energized, and the main control room generates a monitoring alarm, indicating that the SN test is in progress.

[0172] In the non-test state, if the N position contact of 001CC has poor contact, the SN signal cannot be normally connected to 001XR or 002XR, resulting in protection failure, and the lack of monitoring alarm for protection failure cannot be discovered. During the test, taking the SN test of column A as an example, if the contact connecting 001SN and 001XR on 001CC is accidentally closed, it may cause abnormal protection action.

[0173] Based on the operating experience of nuclear power plants, the reliability of the relay hard-wired circuit is relatively high; however, there is a situation where the 001CC contacts are poor in non-test status, resulting in protection failure. In addition, the 001CC lacks monitoring, which poses certain safety risks.

[0174] The logic control method provided in this embodiment can solve the above hidden dangers.

[0175] Optionally, also include:

[0176] When the following second single control conditions are met:

[0177] The first relay acquisition signal of the first relay switch of column A is 1,

[0178] The first acquisition signal of the test selection switch is 1.

[0179] Trigger the liquid level switch test indication.

[0180] In this embodiment, the first dual-control condition includes two sub-conditions, namely:

[0181] Sub-condition 1: The first relay acquisition signal of the first relay switch of column A is 1.

[0182] Sub-condition 2: the first acquisition signal of the test selection switch is 1.

[0183] If and only if both sub-conditions of the second single control condition are satisfied, the liquid level switch test indication is triggered. The liquid level switch test indication indicates that the liquid level switch is under test.

[0184] exist Figure 3 In the example, when 001CC switches to the TA position, the level switch test indication is triggered. At this time, a test alarm appears and the level switch test indicator lights up, indicating that the level switch is under test.

[0185] Optionally, also include:

[0186] When the following third-order control conditions are met:

[0187] 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 delay processing is 1,

[0188] Trigger test switch state.

[0189] In this embodiment, the third single control condition includes: the negated 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 delay processing is 1. In other words, as long as the signal value of any one of the negated values ​​of the first acquisition signal, the second acquisition signal, and the third acquisition signal is 1, the test switch state can be triggered. Triggering the test switch state means that there is currently a liquid level switch in the test state (it can be the liquid level switch of column A or column B).

[0190] exist Figure 3 In the example, when 001CC switches to the N position, if 001CC3 changes to "0" due to an abnormality, a fault alarm will occur. Setting a 1s delay can shield the flashing signal during the CC switching process.

[0191] Optionally, also include:

[0192] When the following fourth single control conditions are met:

[0193] The second acquisition signal of the second relay switch of column B is 1,

[0194] The second acquisition signal of the test selection switch is inverted to 1,

[0195] The first acquisition signal and / or the third acquisition signal of the test selection switch is 1,

[0196] Trigger the liquid level protection logic.

[0197] In this embodiment, the fourth single control condition includes the following three sub-conditions:

[0198] Sub-condition 1: the second relay acquisition signal of the second relay switch of column B is 1;

[0199] Sub-condition 2: the second acquisition signal of the test selection switch is inverted to 1;

[0200] Sub-condition 3: the first acquisition signal and / or the third acquisition signal of the test selection switch is 1.

[0201] Only when all three sub-conditions in the fourth single control condition are met, the liquid level protection logic, such as the high liquid level protection logic and the low liquid level protection logic, is triggered. In an example, the high liquid level protection logic may refer to a series of operations to prevent the water level from being too high, such as reducing the filling rate, increasing the drainage rate, etc.

[0202] exist Figure 3 In the example, when 001CC is in the TB position, 001CC1 and 001CC3 are 0, 001CC2 is 1, the column B test indication circuit is put into operation, and 001CC2 and (001CC1+001CC3) signals doubly lock the column B liquid level control signal to avoid false operation caused by a single failure of the test selection CC; the column A test indication circuit is locked, and the column A liquid level control logic is put into operation.

[0203] Optionally, also include:

[0204] When the following fifth single control conditions are met:

[0205] The second acquisition signal of the second relay switch of column B is 1,

[0206] The second acquisition signal of the test selection switch is 1,

[0207] Trigger the liquid level switch test indication.

[0208] In this embodiment, the fifth single control condition includes two sub-conditions, namely:

[0209] Sub-condition 1: The second relay acquisition signal of the second relay switch of column B is 1;

[0210] Sub-condition 2: The second acquisition signal of the test selection switch is 1.

[0211] Only when both sub-conditions in the fifth single control condition are satisfied, the liquid level switch test indication is triggered. Similarly, the liquid level switch test indication indicates that the liquid level switch is under test.

[0212] exist Figure 3 In the example, when 001CC is switched to the TB position, the level switch test indication is triggered. At this time, a test alarm appears and the level switch test indicator lights up, indicating that the level switch is under test.

[0213] Optionally, the delay duration of the delay processing is 1 second.

[0214] In this embodiment, the delay time of the delay processing can be set according to actual needs. In one example, the delay time of the delay processing can be set to 1 second.

[0215] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0216] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A test logic control method for a conventional island liquid level switch in a nuclear power plant, characterized in that: include: When dual control stations are used, the following first dual control condition is met: The first relay acquisition signal of the first relay switch of column A is 1, The first acquisition signal of the test selection switch is 1, The second acquisition signal of the test selection switch is inverted to 1. Trigger liquid level protection logic; The conventional island liquid level switch test logic control method of a nuclear power plant also includes: When the following second dual control conditions are met: The first relay acquisition signal of the first relay switch of column A is 1, The second acquisition signal of the test selection switch is 1, Trigger the liquid level switch test indication.

2. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 1, characterized in that: Also includes: When the following third dual control conditions are met: The second acquisition signal of the test selection 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 first processed by logic AND, and then the signal value after the first delay processing is 1, or, The fourth acquisition signal of the test selection 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 first processed by logic AND, and then the signal value after the second delay processing is 1. Trigger test switch state.

3. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 1, characterized in that: Also includes: When the following fourth dual control condition is met: The second relay acquisition signal of the second relay switch of column B is 1, The third acquisition signal of the test selection switch is 1, The fourth acquisition signal of the test selection switch is inverted to 1. Trigger the liquid level protection logic.

4. The test logic control method for a conventional island liquid level switch in a nuclear power plant according to claim 1, characterized in that: Also includes: When the following fifth dual control condition is met: The second relay acquisition signal of the second relay switch of column B is 1, The fourth acquisition signal of the test selection switch is 1, Trigger the liquid level switch test indication.

5. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 2, characterized in that: The delay time of the first delay processing is 1 second; The delay duration of the second delay processing is 1 second.

6. A test logic control method for a conventional island liquid level switch in a nuclear power plant, characterized in that: include: When a single control station is used, the following first single control condition is met: The first relay acquisition signal of the first relay switch of column A is 1, The first acquisition signal of the test selection switch is inverted to 1, The second acquisition signal and / or the third acquisition signal of the test selection switch is 1, Trigger liquid level protection logic; The conventional island liquid level switch test logic control method of a nuclear power plant also includes: When the following second single control conditions are met: The first relay acquisition signal of the first relay switch of column A is 1, The first acquisition signal of the test selection switch is 1, Trigger the liquid level switch test indication.

7. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 6, characterized in that: Also includes: When the following third-order control conditions are met: 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 delay processing is 1, Trigger test switch state.

8. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 6, characterized in that: Also includes: When the following fourth single control conditions are met: The second acquisition signal of the second relay switch of column B is 1, The second acquisition signal of the test selection switch is inverted to 1, The first acquisition signal and / or the third acquisition signal of the test selection switch is 1, Trigger the liquid level protection logic.

9. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 6, characterized in that: Also includes: When the following fifth single control conditions are met: The second acquisition signal of the second relay switch of column B is 1, The second acquisition signal of the test selection switch is 1, Trigger the liquid level switch test indication.

10. The test logic control method for the conventional island liquid level switch of a nuclear power plant according to claim 7, characterized in that: The delay time of the delay processing is 1 second.

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