A primary coil simulation device for a nuclear power plant rod position detector

Abstract

The present application relates to the field of electromagnetic induction, especially to a kind of nuclear power plant rod position detector primary coil simulation device.The device comprises: shell, adjusting knob is arranged on the panel of shell, transformer is arranged in the inside of shell, fixed resistance, adjustable resistance, fixed resistance is connected in series in transformer primary coil loop, adjustable resistance is connected in series in transformer secondary coil loop, transformer primary coil includes several taps, respectively with the different gear of adjusting knob corresponding connection respectively with different adjusting knob corresponding connection;Aviation plug, different pins of aviation plug are respectively connected into transformer primary coil loop and transformer secondary coil loop by soft wire.The present application guarantees that rod position system successfully completes the test of relevant function, and guarantees that it satisfies the design requirement of rod position system.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic induction, and more particularly to a primary coil simulation device for a nuclear power plant rod position detector. Background Technology

[0002] For a relatively long straight solenoid, if its volume is v, the number of turns per unit length is n, and it is filled with a magnetic medium with a permeability of μ, then the self-inductance of the solenoid is L = μ·n²·v, which is proportional to the permeability μ of its internal medium.

[0003] The mutual inductance of two coaxial straight solenoids is also proportional to the permeability μ of their internal medium, and can be denoted as M = k·μ. When the current i flows through the first solenoid, the magnetic flux through the other solenoid is... =M·i=k·μ·i. If i changes with time, then Corresponding changes also occur; according to Faraday's law of electromagnetic induction, the magnetic flux through the loop area... When a change occurs, the induced electromotive force generated in the circuit If i = I·sinωt, dμ / dt = 0, then That is, when the permeability of the medium remains constant, the induced electromotive force is proportional to the permeability of the medium and the excitation current (effective value).

[0004] The rod position detector is developed based on the above principle, and it mainly consists of a primary coil and an auxiliary coil.

[0005] The rod position detector is installed outside the travel shell of the drive mechanism, above the reactor pressure vessel. It uses the principle of coil induction to display the position controlled in the reactor core. Because the rod position detector is in an environment with high radiation and high temperature, all coil structures inside the detector must have sufficient reliability. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a simulation device for the primary coil of a nuclear power plant rod position detector, so as to ensure that the rod position system can successfully complete the testing of related functions and meet the design requirements of the rod position system.

[0007] This invention provides a simulation device for the primary coil of a rod position detector in a nuclear power plant, comprising:

[0008] The housing has an adjustment knob on its front panel.

[0009] The housing contains a transformer, a fixed resistor, and an adjustable resistor.

[0010] A fixed resistor is connected in series in the primary winding circuit of the transformer, and an adjustable resistor is connected in series in the secondary winding circuit of the transformer.

[0011] The primary winding of a transformer includes several taps.

[0012] Each is connected to a different gear corresponding to the adjustment knob;

[0013] The aviation connector has different pins that are connected to the primary and secondary coil circuits of the transformer via flexible wires.

[0014] Preferably, the back of the housing is also provided with heat dissipation holes.

[0015] Preferably, the adjustment knob has four positions: high, medium, low, and phase.

[0016] The transformer's tap II is connected to the low position of the adjustment knob, the transformer's tap III is connected to the medium position of the adjustment knob, and the transformer's tap IV is connected to the high position of the adjustment knob.

[0017] The phase position of the adjustment knob is the common terminal, which is connected to pin II of the fixed resistor;

[0018] When the adjustment knob is in the off position, disconnect the connection to the transformer.

[0019] All connections are made using flexible wires.

[0020] Preferably, pins I and XVII of the aviation plug are connected to the primary coil circuit of the transformer, and pins III and IV of the aviation plug are connected to the secondary coil circuit of the transformer.

[0021] Preferably, pin I of the aviation connector is connected to pin I of the fixed resistor, pins III and IV of the aviation connector are connected to pins I and III of the adjustable resistor, respectively, and pins XVII of the aviation connector are connected to tap I of the transformer.

[0022] Preferably, the aviation plug is disposed at one end of a flexible wire, and the flexible wire extends out of the housing through an outlet hole.

[0023] Preferably, pin III of the adjustable resistor is connected to tap V of the transformer, and pin II of the adjustable resistor is connected to pin VI of the transformer.

[0024] Preferably, the aviation connector is a 19-pin aviation connector.

[0025] Compared with the prior art, the nuclear power plant rod position detector primary coil simulation device of the present invention can meet the needs of rod position system testing, effectively simulate the working principle of the detector, and operate stably. It has played an important role in the rod position system testing and rod position main current card testing of Fuqing Units 5, 6 and K-2 / K-3. Attached Figure Description

[0026] Figure 1 A schematic diagram showing the structure of a simulation device for the primary coil of a rod position detector in a nuclear power plant.

[0027] In the picture,

[0028] 1-Housing, 2-Transformer, 3-Fixed resistor, 4-Adjustable resistor, 5-Aviation plug, 6-Adjustment knob, 7-Cable outlet, 8-Heat dissipation hole. Detailed Implementation

[0029] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0030] An embodiment of the present invention discloses a primary coil simulation device for a nuclear power plant rod position detector, such as... Figure 1 As shown, it includes:

[0031] The housing 1 has an adjustment knob 6 on its panel.

[0032] The adjustment knob 6 has four positions: high, medium, low, and phase.

[0033] The housing 1 contains a transformer 2, a fixed resistor 3, and an adjustable resistor 4.

[0034] Fixed resistor 3 is connected in series in the primary coil circuit of transformer 2, and together with the primary coil of the transformer, it simulates the primary coil of the detector.

[0035] The adjustable resistor 4 is connected in series in the secondary coil circuit of the transformer 2. The III pin of the adjustable resistor is connected to the V tap of the transformer, and the II pin of the adjustable resistor is connected to the VI pin of the transformer.

[0036] The primary winding of transformer 2 includes several taps, which are respectively connected to different positions corresponding to the adjustment knob;

[0037] Preferably, the primary side consists of three sets of taps, and the primary coil generates an alternating magnetic field. The secondary side has one set of outputs used to regulate the current in the primary coil.

[0038] Specifically, tap II of transformer 2 is connected to the low position of the adjustment knob, tap III of transformer 2 is connected to the medium position of the adjustment knob, and tap IV of transformer 2 is connected to the high position of the adjustment knob.

[0039] The phase position of the adjustment knob is the common terminal, which is connected to pin II of the fixed resistor 3;

[0040] When the adjustment knob is in the off position, disconnect the connection with transformer 2;

[0041] All connections are made using flexible wires.

[0042] Aviation plug 5 is connected to the primary coil circuit and the secondary coil circuit of transformer 2, respectively.

[0043] Specifically, pins I and XVII of the aviation plug are connected to the primary coil circuit of the transformer, and pins III and IV of the aviation plug are connected to the secondary coil circuit of the transformer.

[0044] More specifically, pin I of the aviation plug 5 is connected to pin I of the fixed resistor, pins III and IV of the aviation plug 5 are connected to pins I and III of the adjustable resistor 3, respectively, and pins XVII of the aviation plug 5 are connected to tap I of the transformer 2.

[0045] The aviation plug 5 is located at one end of a flexible wire, which extends out of the housing through the outlet hole 7.

[0046] The aviation connector 5 is a 19-pin aviation connector.

[0047] To prevent overheating inside the device and subsequent burnout, preferably, the back of the housing 1 is also provided with heat dissipation holes 8.

[0048] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A simulation device for the primary coil of a nuclear power plant rod position detector, characterized in that, include: The housing has an adjustment knob on its front panel. The housing contains a transformer, a fixed resistor, and an adjustable resistor. A fixed resistor is connected in series in the primary winding circuit of the transformer, and an adjustable resistor is connected in series in the secondary winding circuit of the transformer. The primary winding of the transformer includes several taps, which are respectively connected to different positions corresponding to the adjustment knob; The aviation connector has different pins that are connected to the primary coil circuit and the secondary coil circuit of the transformer via flexible wires. The adjustment knob has four positions: high, medium, low, and phase. The transformer's tap II is connected to the low position of the adjustment knob, the transformer's tap III is connected to the medium position of the adjustment knob, and the transformer's tap IV is connected to the high position of the adjustment knob. The phase position of the adjustment knob is the common terminal, which is connected to pin II of the fixed resistor; When the adjustment knob is in the off position, disconnect the connection to the transformer. All connections are made using flexible wires; The aviation plug's pins I and XVII are connected to the transformer's primary winding circuit, and its pins III and IV are connected to the transformer's secondary winding circuit. The first pin of the aviation connector is connected to the first pin of the fixed resistor; the third and fourth pins of the aviation connector are connected to the first and third pins of the adjustable resistor, respectively; the XVII pins of the aviation connector are connected to the first tap of the transformer; the third pin of the adjustable resistor is connected to the V tap of the transformer; and the second pin of the adjustable resistor is connected to the VI pin of the transformer.

2. The nuclear power plant rod position detector primary coil simulation device according to claim 1, characterized in that, The back of the housing is also provided with heat dissipation holes.

3. The nuclear power plant rod position detector primary coil simulation device according to claim 1, characterized in that, The aviation plug is located at one end of a flexible wire, which extends out of the housing through an outlet hole.

4. The nuclear power plant rod position detector primary coil simulation device according to claim 1, characterized in that, The aviation connector is a 19-pin aviation connector.

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