Nuclear power plant temperature sensor with redundancy design

Abstract

The utility model discloses a nuclear power plant temperature sensor with redundancy design, which comprises a platinum resistor and wiring terminals which are arranged at two ends of a base, and one end of a plurality of wiring terminals penetrates through the base and is correspondingly connected with two ends of the platinum resistor. Wherein every three wiring terminals are respectively connected with two ends of each platinum resistor. The temperature sensor provided by the utility model has the advantages that two ends of the platinum resistor are respectively provided with a redundant wiring terminal, so that the function of multi-measuring-point redundant multiplexing is realized. In application, if one measuring point or one measuring point at each of two ends fails due to accidents or uncontrollable factors, the redundant measuring points can be quickly switched to, and normal work can be continued. The loss of time, manpower and material resources is greatly reduced, and the reliability of test data is improved. The device is suitable for pressurizing occasions of various devices, and provides powerful support for a sealing performance detection test of a large-scale device.

Description

Technical Field

[0001] The utility model relates to a nuclear power plant temperature sensor with a redundant design, which is suitable for temperature monitoring in various plant buildings, equipment and other places (such as nuclear power plant containment overall sealing test, containment structure strength test, etc.), and belongs to the field of detection. Background Art

[0002] In industrial production, some special large-scale reaction devices or plant buildings require real-time online temperature monitoring during daily operation or large-scale tests, and multiple temperature sensors are often used simultaneously, which places extremely high demands on the reliability of the temperature sensors and the test system.

[0003] Pt100 is a commonly used temperature sensor. When a Pt100 sensor is exposed to a temperature to be measured, the temperature change causes the Pt100's resistance to change. This change can be used to indirectly measure the temperature by measuring the Pt100's resistance. Generally, the resistance of a Pt100 sensor changes linearly with temperature.

[0004] To measure the resistance of a Pt100, it is necessary to assemble it into a temperature measurement circuit. A commonly used circuit is a four-wire temperature measurement circuit, consisting of two probe wires and two lead wires. The probe wires connect the Pt100 sensor to the measuring instrument, and the lead wires connect the measuring instrument to the power supply.

[0005] Currently, four-wire platinum resistance temperature sensors are commonly used. All four measuring points (i.e., wiring terminals) on the four-wire platinum resistance temperature sensors are involved in the measurement during operation. If one of the measuring points fails, it will have a significant impact on the measurement results, which may lead to test failure, progress delays, and loss of manpower and material resources.

[0006] For example, during the containment integrity test at a domestic nuclear power plant, the containment needed to be pressurized to simulate the pressure of an accident. Four-wire RTD temperature sensors were used throughout the test. As the pressure increased, some sensor values ​​began to deviate. Because the containment was pressurized, personnel needed to reduce the pressure to ambient before entering, which prolonged the test. Furthermore, the cause of the investigation was often due to loosening of the wiring terminals caused by cable swaying due to the increased pressure, leading to sensor failure. Without redundant sensors, new sensors had to be replaced, resulting in extended testing time and delays in the main project schedule, reducing efficiency and increasing testing costs. Summary of the Invention

[0007] In order to solve the above-mentioned problems in the prior art, the utility model provides a temperature sensor with redundant measuring points.

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a nuclear power plant temperature sensor with a redundant design, comprising a platinum resistor and wiring terminals arranged at both ends of a base, wherein one end of a plurality of wiring terminals passes through the base and is correspondingly connected to the two ends of the platinum resistor, characterized in that there are more than five wiring terminals, and at least two and three wiring terminals are connected to the two ends of the platinum resistor respectively.

[0009] The base is cylindrical, and the six connection terminals are evenly distributed inside the base along the cross-section circumference of the base.

[0010] The two wiring terminals at one end of the platinum resistor and the two wiring terminals at the other end of the platinum resistor are connected to form a four-wire temperature measurement circuit, and the remaining two wiring terminals are redundant wiring terminals.

[0011] The advantage of this utility model is that, by providing redundant terminals at each end of the platinum resistor, the temperature sensor achieves redundant multiplexing of multiple measuring points. During application, if an unexpected or uncontrollable factor causes one or both measuring points to fail, the redundant measuring points can be quickly switched to and normal operation can resume. This significantly reduces time, labor, and material losses, and improves the reliability of test data. It is suitable for pressurization applications in various devices and provides strong support for leak detection tests on large-scale equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a partial cross-sectional structural schematic diagram of an embodiment of the utility model;

[0013] Figure 2 yes Figure 1 A top view of

[0014] Figure 3 It is a circuit principle diagram when the utility model is applied;

[0015] Figure 4 It is a wiring diagram when the utility model is used.

[0016] Explanation of the marks in the figure: 1. Terminal (measuring point), 2. Platinum resistor, 3. Base, 4. Signal cable, 5. Local junction box, 6. Prefabricated cable, 7. Containment electrical penetration, 8. External cabinet, 9. Temporary test cable, 10. Voltage measuring device (secondary instrument), 11. Constant current source, AC. Upper terminal of platinum resistor, DF. Lower terminal of platinum resistor, N. Inside of containment, W. Outside of containment, S. Sensor (this utility model). DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1-Figure 3As shown, the present invention is a nuclear power plant temperature sensor with a redundant design, comprising a platinum resistor 2 and a terminal 1 provided at both ends of a base 3. One end of each of the terminal 1 passes through the base 3 and is connected to the two ends of the platinum resistor 2. In this embodiment, there are six terminals 1 (or five or more), and at least three terminals 1 are connected to the two ends of the platinum resistor 2, respectively. Figure 3 Terminals A and B of Terminal 1 at the bottom of the platinum resistor 2, and terminals E and F of Terminal 1 at the bottom of the platinum resistor 2, serve as the terminals for the four-wire temperature measurement circuit. The remaining two terminals, C and D, serve as redundant terminals. In application, if an unexpected or uncontrollable factor causes one or both of the measurement points, A and B, or E and F, to fail, the redundant measurement points, C and D, can be quickly switched to, and normal operation can be resumed.

[0019] The structure of the base is the same as that of the prior art, which is cylindrical, and the six terminals 1 are evenly distributed inside the base 3 along the circumference of the cross section of the base 3 .

[0020] See also Figure 3 and Figure 4 When the sensor S of the present invention is used, each terminal measuring point 1 can be connected to an on-site junction box 5 via a signal cable 4. The on-site junction box 5 is connected to a containment electrical penetration 7 via a prefabricated cable 6. The containment electrical penetration 7 is connected to an external cabinet 8 via a prefabricated cable 6. The external cabinet 8 is connected to a voltage measuring device 10 and a current measuring device 11 via a temporary test cable 9. The multiple terminal blocks 1 of the sensor S utilize a four-wire temperature measurement circuit for measurement. The six terminal blocks 1 form a redundant design. If one or both measuring points fail, the redundant measuring point can replace it and continue normal operation, resulting in high stability and reliability.

Claims

1. A nuclear power plant temperature sensor with a redundant design, comprising a platinum resistor (2) and a terminal (1) provided at both ends of a base (3), wherein one end of a plurality of terminals (1) passes through the base (3) and is correspondingly connected to both ends of the platinum resistor (2), characterized in that: There are more than five connection terminals (1), and at least two and three connection terminals (1) are connected to the two ends of the platinum resistor (2), respectively.

2. The nuclear power plant temperature sensor with redundant design according to claim 1, characterized in that: The base (3) is cylindrical, and the six terminal ends (1) are evenly distributed inside the base (3) along the cross-sectional circumference of the base (3).

3. The nuclear power plant temperature sensor with redundant design according to claim 1, characterized in that: The two terminals (1) at one end of the platinum resistor (2) and the two terminals (1) at the other end of the platinum resistor (2) are connected to form a four-wire temperature measurement circuit, and the remaining two terminals (1) are redundant terminals.

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