Auxiliary calibration circuit and device and rod position signal measuring and adjusting clamping piece

Abstract

The utility model relates to an auxiliary calibration circuit and device and a rod position signal measuring and adjusting clamping piece. The circuit comprises a first resistive unit, a second resistive unit, a first filtering unit, a second filtering unit and a third filtering unit. The first end of the first resistive unit is connected with the first filtering unit and used for being connected with a primary coil power supply circuit, the second end of the first resistive unit is connected with the second resistive unit and the second filtering unit, and the second end of the second resistive unit is connected with the third filtering unit and used for being connected with the primary coil power supply circuit. The second end of the first filtering unit is used for connecting a secondary line and bottom and top coil amplifying circuits, the second end of the second filtering unit is used for connecting the bottom and top coil amplifying circuits, and the second end of the third filtering unit is used for a secondary coil amplifying circuit. According to the utility model, under the condition that the control rod is not lifted to the highest rod position, a worker can be assisted to calibrate the replaced SCR1 card.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant equipment, in particular to an auxiliary calibration circuit and device and a rod position signal measurement and adjustment card. Background Art

[0002] The rod position signal measurement and adjustment card (SCR1 card) is used to adjust the position of the control rods to control the reactor core's reaction rate. After each SCR1 card replacement, static errors may exist between the replaced SCR1 card and the rod position signal acquisition system hardware compared to the old SCR1 card. Therefore, loop discrepancy calibration is performed.

[0003] In the related art, calibration is typically performed using an existing SCR1 standardization tool. The calibration process specifically involves controlling the SCR1 card to raise the control rod to its highest position and hold it there for a specified period. The secondary, bottom, and top coil amplifier circuits within the SCR1 card are then used to detect the induced voltages output by the secondary, bottom, and top coils. Circuit difference calibration is then performed based on the detected induced voltages to eliminate errors. However, existing SCR1 standardization tools not only have a complex calibration process but also affect core reactivity due to control rod position adjustment during calibration. Furthermore, they are bulky and lack portability. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an auxiliary calibration circuit and device and a rod position signal measurement and adjustment card.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing an auxiliary calibration circuit for a rod position signal measurement and adjustment card, the rod position signal measurement and adjustment card comprising a primary coil power supply circuit, a secondary coil amplifying circuit, a bottom coil amplifying circuit and a top coil amplifying circuit, the auxiliary calibration circuit comprising a first resistive unit, a second resistive unit, a first filtering unit, a second filtering unit and a third filtering unit;

[0006] The first end of the first resistive unit is connected to the first end of the first filtering unit and is used to connect to the first end of the primary coil power supply circuit, and the second end of the first resistive unit is connected to the first end of the second resistive unit and the first end of the second filtering unit;

[0007] The second end of the second resistive unit is connected to the first end of the third filtering unit and is used to connect to the second end of the primary coil power supply circuit;

[0008] The second end of the first filtering unit is used to connect the first end of the secondary coil amplifying circuit, the first end of the bottom coil amplifying circuit and the first end of the top coil amplifying circuit;

[0009] The second end of the second filtering unit is used to connect the second end of the bottom coil amplifying circuit and the second end of the top coil amplifying circuit;

[0010] The second end of the third filtering unit is used for the second end of the secondary coil amplifying circuit.

[0011] Preferably, the resistance range of the first resistive unit is 16.2 ohms to 23.1 ohms, and the resistance range of the second resistive unit is 69 ohms to 89.6 ohms.

[0012] Preferably, the resistance of the first resistive unit is 20 ohms, and the resistance of the second resistive unit is 80 ohms.

[0013] Preferably, the first resistive unit includes a first resistor, and the second resistive unit includes a second resistor.

[0014] Preferably, the first filtering unit, the second filtering unit and the third filtering unit respectively include a filtering capacitor.

[0015] Preferably, the capacitance range of the filter capacitor is 100 nanofarads to 10 microfarads.

[0016] Preferably, the auxiliary calibration circuit further includes a fuse connected between the second resistive unit and the second end of the primary coil power supply circuit.

[0017] Preferably, the auxiliary calibration circuit also includes a connector connected to the first resistive unit, the second resistive unit, the first filtering unit, the second filtering unit and the third filtering unit, and is used to connect the primary coil power supply circuit, the secondary coil amplifying circuit, the bottom coil amplifying circuit and the top coil amplifying circuit.

[0018] The utility model also constructs an auxiliary calibration device, which includes the auxiliary calibration circuit mentioned above.

[0019] The utility model also constructs a rod position signal measurement and adjustment card, which includes the auxiliary calibration device mentioned above.

[0020] The implementation of the utility model has the following beneficial effects: providing an auxiliary calibration circuit that can assist personnel in calibrating a replaced SCR1 card to eliminate static errors without raising the control rods to the highest rod position and without affecting the core reaction; and also has the advantages of a simple circuit structure, easy operation, portability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0022] Figure 1 is a circuit schematic diagram of an auxiliary calibration circuit in some embodiments of the present utility model;

[0023] Figure 2 It is a circuit principle diagram of the auxiliary calibration circuit in other embodiments of the present utility model. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0025] In the following description, it should be understood that the directions or positional relationships indicated by “front”, “back”, “up”, “down”, “left”, “right”, “longitudinal”, “horizontal”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “head”, and “tail” are based on the directions or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific direction. They are only for the convenience of describing the technical solution, and do not indicate that the device or element referred to must have a specific direction. Therefore, they cannot be understood as a limitation on the present utility model.

[0026] Figure 1 This is a circuit diagram of the auxiliary calibration circuit in some embodiments of the present invention. The auxiliary calibration circuit is used for the rod position signal measurement and adjustment card 10 (abbreviated as SCR1 card), which can assist the staff in calibrating the replaced SCR1 card to eliminate static errors without affecting the core reaction. In addition, Figure 1 As shown, the SCR1 card includes a secondary coil (not shown), a bottom coil (not shown), a top coil (not shown), a primary coil (not shown), a primary coil power supply circuit 101, a secondary coil amplifying circuit 102, a bottom coil amplifying circuit 103, a top coil amplifying circuit 104 and a primary coil amplifying circuit 105.

[0027] The primary coil power supply circuit 101 is used to provide a working current signal to the primary coil, where the current signal includes a DC component and an AC component.

[0028] The secondary coil amplifying circuit 102 and the primary coil amplifying circuit 105 are used to amplify the induced voltage outputted by the secondary coil and the primary coil in turn, so as to allow the SCR1 card to determine the position of the control rod.

[0029] The bottom coil and top coil sense whether the control rod has reached the bottom or top. For example, when the control rod reaches the bottom, the bottom coil outputs an induced voltage. The bottom coil amplifier circuit 103 amplifies this induced voltage. Due to the large gain factor of the bottom coil amplifier circuit 103, the amplified signal can be considered a switching signal. A high voltage after amplification indicates that the control rod has reached the bottom, while a low voltage indicates that the control rod has not reached the bottom. It should be noted that the operating mechanism of the top coil and the bottom coil amplifier circuit 103 are similar, so they can be used as a reference.

[0030] See Figure 1 The auxiliary calibration circuit may include a first resistive unit 1, a second resistive unit 2, a first filtering unit 3, a second filtering unit 4, and a third filtering unit 5. Specifically, a first end of the first resistive unit 1 is connected to a first end of the first filtering unit 3 and is used to connect to a first end of the primary coil power supply circuit 101; a second end of the first resistive unit 1 is connected to a first end of the second resistive unit 2 and a first end of the second filtering unit 4; a second end of the second resistive unit 2 is connected to a first end of the third filtering unit 5 and is used to connect to a second end of the primary coil power supply circuit 101; a second end of the first filtering unit 3 is used to connect to a first end of the secondary coil amplifying circuit 102, a first end of the bottom coil amplifying circuit 103, and a first end of the top coil amplifying circuit 104; a second end of the second filtering unit 4 is used to connect to a second end of the bottom coil amplifying circuit 103 and a second end of the top coil amplifying circuit 104; and a second end of the third filtering unit 5 is used to connect to a second end of the secondary coil amplifying circuit 102.

[0031] It should be noted that when calibrating the existing SCR1 standardization tool, the control rod is raised to the highest rod position and maintained there so that the secondary coil and the primary coil can induce the maximum induced voltage possible. In this way, PRI calibration can be achieved based on the induced voltage output by the secondary coil and the primary coil based on the existing method.

[0032] Accordingly, the working principle of the present invention is as follows: the first resistance unit 1 and the second resistance unit 2 are connected in series at both ends of the primary coil power supply circuit 101. Since the primary coil power supply circuit 101 outputs a current signal, a voltage signal is formed at both ends of the circuit after the first resistance unit 1 and the second resistance unit 2 are connected in series. The voltage signal is not less than or as close as possible to the induced voltage output by the secondary coil and the primary coil when the control rod is raised to the highest rod position. Then, the voltage signal replaces the induced voltage generated by the secondary coil and the primary coil when the control rod is raised to the highest rod position. Furthermore, since the present invention limits the secondary coil and the primary coil when in use, Since the power supply to the coil may affect the operation of the top and bottom coils, the voltage signal generated across the first resistive unit 1 replaces the induced voltage output by the top and bottom coils to provide a stable voltage signal to the secondary coil amplifier circuit 102 and the bottom coil amplifier circuit 103. This ensures that the SCR1 card does not determine that the control rod position is out of range due to the signals output by the secondary coil amplifier circuit 102 and the bottom coil amplifier circuit 103 (that is, the voltage across the first resistive unit 1 does not exceed the allowable voltage range of the voltage signal input to the secondary coil amplifier circuit 102 and the bottom coil amplifier circuit 103).

[0033] In a certain nuclear power plant, the AC component and DC component of the current signal output by the primary coil power supply circuit 101 are approximately 82.35 mA and 100.39 mA, respectively. The minimum allowable input voltage of the bottom coil amplifying circuit 103 is 1.33 V. Therefore, the resistance of the first resistive unit 1 should not be less than 16.2 ohms (equal to 1.33 V divided by 82.35 mA). The maximum allowable input voltage of the top coil amplifying circuit 104 is 1.91 V. Therefore, the resistance of the first resistive unit 1 should not be greater than 23.1 ohms (equal to 1.91 V divided by 82.35 mA). Therefore, the resistance range of the first resistive unit 1 can be 16.2 ohms to 23.1 ohms, and the resistance of the first resistive unit 1 is preferably 20 ohms.

[0034] Furthermore, since the maximum allowable input voltage of the primary coil amplifier circuit 105 is 11V, the sum of the resistances of the first and second resistive units 1 and 2 should not be greater than 109.3 ohms (equal to 11V divided by 100.39mA). The maximum internal resistance of the primary coil is approximately 89 ohms. Considering that the voltage across the first and second resistive units 1 and 2 after being connected in series should not be less than the induced voltage of the primary coil, the sum of the resistances of the first and second resistive units 1 and 2 should not be less than 89 ohms. Therefore, the resistance range of the first and second resistive units 1 and 2 is 89 ohms to 109.6 ohms. If the resistance of the first resistive unit 1 is 20 ohms, the resistance range of the second resistive unit 2 can be 69 ohms to 89.6 ohms accordingly. The resistance of the second resistive unit 2 is preferably 80 ohms.

[0035] In some embodiments, as Figure 2 As shown, the first resistive unit 1 includes a first resistor R1, and the second resistive unit 2 includes a second resistor R2. The first end and the second end of the first resistor R1 correspond to the first end and the second end of the first resistive unit 1, respectively, and the first end and the second end of the second resistor R2 correspond to the first end and the second end of the second resistive unit 2, respectively.

[0036] To improve the calibration effect, the resistance accuracy of the first resistive unit 1 and the second resistive unit 2 needs to be improved. Therefore, the first resistor R1 and the second resistor R2 can use resistors with a resistance error of less than 0.01%. Of course, in order to maximize the resistance accuracy, other resistors can be connected in series or in parallel with the first resistor R1 or the second resistor R2 to achieve precise resistance adjustment. For example, when the resistance of the first resistor R1 is slightly greater than 20 ohms, a large-resistance resistor can be connected in parallel at both ends of the first resistor R1 to reduce the resistance value. If the resistance of the first resistor R1 is slightly less than 20 ohms, a small-resistance resistor can be connected in series between the first resistor R1 and the second resistive unit 2 to increase the resistance value.

[0037] Since calibration takes a certain amount of time and the first resistance unit 1 and the second resistance unit 2 generate heat during operation, in order to reduce the impact of temperature on calibration, the first resistor R1 and the second resistor R2 preferably use resistors with a temperature coefficient less than 10 ppm / °C.

[0038] In some embodiments, as Figure 2 As shown, the first filter unit 3, the second filter unit 4 and the third filter unit 5 can respectively include filter capacitors. The first end and the second end of the filter capacitor correspond to the first end and the second end of the corresponding filter unit (including the first to third filter units), respectively. The main function of the filter capacitor is to prevent the DC component output by the primary coil power supply circuit 101 from being input into the bottom coil amplifier circuit 103 and the top coil amplifier circuit 104, and to retain the AC component output by the primary coil power supply circuit 101 as much as possible, thereby playing a bandpass filtering role. Furthermore, the capacitance range of the filter capacitor can be 100 nanofarads to 10 microfarads. It should be noted that the capacitance of the filter capacitor can be determined by the frequency of the AC component output by the primary coil power supply circuit 101, and the capacitance of the filter capacitor is preferably 10 microfarads.

[0039] To avoid overcurrent damage to the primary coil power supply circuit 101, in some embodiments, as Figure 2 As shown, the auxiliary calibration circuit further includes a fuse 6 connected between the second resistive unit 2 and the second end of the primary coil power supply circuit 101. In this embodiment, when the primary coil power supply circuit 101 is overcurrent, the fuse 6 will be disconnected, thereby playing a protective role.

[0040] To facilitate electrical connection between the present invention and the primary coil power supply circuit 101, secondary coil amplifying circuit 102, bottom coil amplifying circuit 103, top coil amplifying circuit 104, and primary coil amplifying circuit 105 included in the SCR1 card, in some embodiments, the auxiliary calibration circuit further includes a connector 7 for connecting the primary coil power supply circuit 101, secondary coil amplifying circuit 102, bottom coil amplifying circuit 103, and top coil amplifying circuit 104 to the first resistive unit 1, the second resistive unit 2, the first filtering unit 3, the second filtering unit 4, and the third filtering unit 5. It is understood that the terminals of the connector 7 are pre-connected to the first resistive unit 1, the second resistive unit 2, the first filtering unit 3, the second filtering unit 4, and the third filtering unit 5. As long as female sockets corresponding to the respective pins and compatible with the connector 7 are provided on the SCR1 card, when calibration is required, the connector 7 can be simply inserted into the female socket to perform calibration. Preferably, the connector 7 is a Phoenix terminal.

[0041] It should be noted that the main function of the present utility model is to form the voltage signal required for calibration at the input ends of the secondary coil amplifier circuit, the bottom coil amplifier circuit, the top coil amplifier circuit and the primary coil amplifier circuit through the cooperation of the first resistive unit, the second resistive unit, the first filter unit, the second filter unit and the third filter unit, thereby assisting the staff to calibrate the replaced SCR1 card to eliminate static errors without raising the control rod to the highest rod position and without affecting the core reaction. It also has the advantages of simple circuit structure and easy operation, and because the number of electronic components required is small, it also has the advantages of easy portability and low cost.

[0042] The present utility model also provides an auxiliary calibration device, which includes the auxiliary calibration circuit provided in the embodiment of the present utility model.

[0043] The utility model also provides a rod position signal measurement and adjustment card component, including the auxiliary calibration device provided in the embodiment of the utility model.

[0044] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An auxiliary calibration circuit for a rod position signal measurement and adjustment card, the rod position signal measurement and adjustment card comprising a primary coil power supply circuit, a secondary coil amplification circuit, a bottom coil amplification circuit, and a top coil amplification circuit, characterized in that: The auxiliary calibration circuit comprises a first resistive unit (1), a second resistive unit (2), a first filtering unit (3), a second filtering unit (4) and a third filtering unit (5); The first end of the first resistive unit (1) is connected to the first end of the first filtering unit (3) and is used to connect to the first end of the primary coil power supply circuit; the second end of the first resistive unit (1) is connected to the first end of the second resistive unit (2) and the first end of the second filtering unit (4); The second end of the second resistive unit (2) is connected to the first end of the third filtering unit (5) and is used to connect to the second end of the primary coil power supply circuit; The second end of the first filtering unit (3) is used to connect the first end of the secondary coil amplifying circuit, the first end of the bottom coil amplifying circuit and the first end of the top coil amplifying circuit; The second end of the second filtering unit (4) is used to connect the second end of the bottom coil amplifying circuit and the second end of the top coil amplifying circuit; The second end of the third filtering unit (5) is used for the second end of the secondary coil amplifying circuit.

2. The auxiliary calibration circuit according to claim 1, characterized in that: The resistance value range of the first resistive unit (1) is 16.2 ohms to 23.1 ohms, and the resistance value range of the second resistive unit (2) is 69 ohms to 89.6 ohms.

3. The auxiliary calibration circuit according to claim 2, characterized in that: The resistance value of the first resistive unit (1) is 20 ohms, and the resistance value of the second resistive unit (2) is 80 ohms.

4. The auxiliary calibration circuit according to any one of claims 1 to 3, characterized in that: The first resistive unit (1) includes a first resistor, and the second resistive unit (2) includes a second resistor.

5. The auxiliary calibration circuit according to claim 1, wherein: The first filtering unit (3), the second filtering unit (4) and the third filtering unit (5) respectively include filtering capacitors.

6. The auxiliary calibration circuit according to claim 5, characterized in that: The capacitance range of the filter capacitor is 100 nanofarads to 10 microfarads.

7. The auxiliary calibration circuit according to claim 1, wherein: It also includes a fuse (6) connected between the second resistive unit (2) and the second end of the primary coil power supply circuit.

8. The auxiliary calibration circuit according to claim 1, wherein: It also includes a connector (7) for connecting the first resistive unit (1), the second resistive unit (2), the first filtering unit (3), the second filtering unit (4) and the third filtering unit (5) and for connecting the primary coil power supply circuit, the secondary coil amplifying circuit, the bottom coil amplifying circuit and the top coil amplifying circuit.

9. An auxiliary calibration device, characterized in that: The auxiliary calibration circuit comprises the auxiliary calibration circuit according to any one of claims 1 to 8.

10. A rod position signal measurement and adjustment card, characterized in that: Comprising the auxiliary calibration device as described in claim 9.

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