A grounding system online monitoring device

Abstract

The present invention proposes an online monitoring device for a grounding system, which is used for the EAST full superconducting tokamak device. The monitoring device includes: a monitoring device host, the monitoring device host includes a signal generating device and a signal receiving device, and a signal generating device and a signal receiving device are respectively installed on each different type of grounding wire of the grounding system; the monitoring device host generates a predetermined type of waveform signal through the signal generating device, which is respectively injected into the four types of grounding wires, and the signal receiving device detects the signal and transmits it to the monitoring device host, and the monitoring device host performs signal waveform comparison and judgment. The present invention uses a signal generating device to inject a small signal into the grounding conductor, and the signal receiving device detects the signal on the grounding conductor to determine whether a multi-point grounding fault occurs in the grounding system, and can also monitor the fault current flowing through the grounding system of the EAST full superconducting tokamak device.

Description

Technical Field

[0001] The present invention belongs to the field of electronic detection technology and relates to an instrument that can monitor the real-time operating status of the grounding system of the EAST fully superconducting tokamak device online, and can give an alarm in time and automatically check the fault scope when an abnormality occurs in the grounding system. Background Art

[0002] The grounding system is widely used in power supply and distribution, scientific research, medical and other industries and fields. Different use environments reflect different grounding functions. For example, the neutral point grounding of the power system is the working grounding; the metal shell grounding of the live equipment is the protective grounding; the shielding layer grounding of precision instruments and special equipment to prevent electric field interference is the shielding grounding. Each type of grounding has its own tasks, and it is strictly forbidden to interfere with each other between different grounding types. At present, there is no effective monitoring method. Different grounding types are cross-connected, resulting in multiple grounding faults in the grounding system from time to time, which interferes with the measurement and diagnosis instruments and equipment of the EAST full superconducting tokamak device. In severe cases, it cannot work normally or even damages; the grounding system of the EAST full superconducting tokamak device adopts a classified grounding mode, with a total of four types of grounding: protective grounding, working grounding, shielding grounding, and measurement / diagnosis grounding. The grounding system is not only related to the normal operation of the EAST full superconducting tokamak device, but also to the safety of personnel and the device and its ancillary equipment. The online monitoring equipment of the grounding system is conducive to the efficient and safe operation of the device. Summary of the invention

[0003] The present invention provides an online monitoring device for a grounding system, which can identify multi-point grounding faults in the grounding system itself and detect the fault current flowing through the grounding system of the EAST full superconducting tokamak device. The technical solution adopted by the present invention is as follows:

[0004] An online monitoring device for a grounding system, used for an EAST full superconducting tokamak device, the monitoring device comprises: a monitoring device host, the monitoring device host comprises a signal generating device and a signal receiving device:

[0005] A signal generating device and a signal receiving device are respectively installed on each type of grounding wire of the grounding system;

[0006] The monitoring device host generates a predetermined type of waveform signal through a signal generating device, which is injected into four types of grounding wires respectively. After the signal receiving device detects the signal, it is transmitted to the monitoring device host, and the monitoring device host compares and judges the signal waveform.

[0007] Furthermore, when the grounding system is normal, the signal receiving device cannot detect the signal injected by the signal generating device. When the grounding system has multiple grounding points or multiple grounding wires are interconnected, a closed loop is formed. The signal receiving device monitors the signal sent by the signal generating device, and the monitoring device host automatically performs waveform comparison. If the signal receiving device does not collect the waveform, it means that the grounding system is operating normally; if the waveform collected by the signal receiving device is consistent with the waveform sent by the signal generating device, it means that the type of grounding where the signal receiving device is located has a multi-point grounding fault; if the waveform collected by two or more signal receiving devices is consistent with the waveform sent by the signal generating device, it means that a mixed fault has occurred in these two or more types of grounding wires; if the waveform collected by the signal receiving device is inconsistent with the waveform sent by the signal generating device, it means that the signal is generated by the EAST fully superconducting tokamak device. The above operating conditions are uploaded to the monitoring background in real time, and the fault type is identified, and the corresponding alarm signal is issued at the same time.

[0008] Furthermore, the grounding types of the grounding system include: protective grounding, working grounding, shielding grounding, diagnostic grounding, and other grounding.

[0009] Furthermore, the number of monitored grounding paths of the online monitoring device is adjustable, that is, monitoring one path, or monitoring multiple paths at the same time; in the event of a fault, the fault branch signal receiving device can monitor the signal sent by the device, make a judgment through signal waveform comparison, and determine the fault range and fault type.

[0010] Furthermore, the grounding online monitoring device emits several different waveforms, including square waves, sawtooth waves, and sine waves, to determine whether the monitoring device detects the signal emitted by itself. If a signal is detected, the type of grounding fault can be determined by waveform comparison; the waveform is adjustable, and any waveform can be selected according to the operating conditions. Each signal generating device cyclically emits a signal in turn, and all signal receiving devices work online in real time and receive signals at the same time.

[0011] The working principle of the present invention is: a signal generating device and a signal receiving device (small signal injection method) are respectively installed on the four types of grounding wires. The signal receiving device can monitor the signal waveform emitted by the signal generating device or the grounding system, and make judgments by waveform comparison. If the signal receiving device does not collect the waveform, it means that the grounding system is operating normally; if the waveform collected by the signal receiving device is consistent with the waveform emitted by the transmitting device, it means that a multi-point grounding fault has occurred in the type of grounding where the receiving device is located; if the waveform collected by two or more signal receiving devices is consistent with the waveform emitted by the transmitting device, it means that a mixed fault has occurred in these two or more types of grounding wires. If the waveform collected by the signal receiving device is inconsistent with the waveform emitted by the transmitting device, it means that the signal is generated by the EAST fully superconducting Tokamak device. The above operating conditions are uploaded to the monitoring background in real time to remind management personnel to troubleshoot in time and ensure the normal operation of the grounding system of the EAST fully superconducting Tokamak device.

[0012] Beneficial effects:

[0013] The present invention can quickly, accurately and effectively monitor the operating status of the grounding system of the EAST fully superconducting tokamak device, and is suitable for large-scale promotion and use to ensure the normal operation of various precision instruments and diagnostic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a schematic diagram of the present invention;

[0016] Figure 2 It is the waveform diagram emitted by the grounding online monitoring device.

[0017] Explanation of the accompanying drawings: ① protective grounding, ② working grounding, ③ shielding grounding, ④ diagnostic grounding, ⑤ arbitrary grounding point, ⑥ signal receiving device, ⑦ signal generating device, ⑧ grounding electrode, ⑨ monitoring equipment host. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all 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 protection scope of the present invention.

[0019] According to an embodiment of the present invention, Figure 1As shown in , the EAST full superconducting tokamak device to be tested includes four types of grounding: protective grounding 1, working grounding 2, shielding grounding 3, and diagnostic grounding 4. A signal generating device 7 and a signal receiving device 6 are respectively installed on the four types of grounding wires (small signal injection method, coupling a specific signal through a ring coil, and a high-precision ring Hall sensor receiving the signal). Figure 1 As shown in , the signal generator 7 of the monitoring device host 9 sends a small signal, which is injected into four types of grounding wires respectively. When the grounding system is normal (i.e., when various groundings are not mixed), the signal receiving device 6 cannot detect the signal injected by the signal generator 7. When the grounding system has multiple grounding points or multiple grounding wires are connected to each other, a closed loop is formed. The signal receiving device 6 detects the signal sent by the signal generator 7. The monitoring device host 9 can automatically compare the waveforms. If the signal receiving device does not collect the waveform, it means that the grounding system is operating normally; if the waveform collected by the signal receiving device is consistent with the waveform sent by the transmitting device, it means that the type of grounding where the receiving device is located has a multi-point grounding fault; if the waveform collected by two or more signal receiving devices is consistent with the waveform sent by the transmitting device, it means that the two or more types of grounding wires have a mixed fault. If the waveform collected by the signal receiving device is inconsistent with the waveform sent by the transmitting device, it means that the signal is generated by the EAST full superconducting tokamak device. The above operating conditions are uploaded to the monitoring background in real time, and the fault type is identified, and the corresponding alarm signal is issued at the same time. Help maintenance personnel to quickly troubleshoot and ensure the reliable operation of the grounding system.

[0020] Figure 2 Several different waveforms emitted by the grounding online monitoring device are shown. In the figure, the top is a square wave, the middle is a sawtooth wave, and the bottom is a sine wave. Whether the device detects the signal emitted by itself, if the signal is detected, the type of grounding fault can be determined by waveform comparison. The waveform is adjustable, and any waveform can be selected according to the operating conditions. Each signal generating device sends out signals in a cycle in turn. For example: when the signal generating device on the grounding branch ① sends a signal, the signal generating device on the grounding branch ②③④ does not work, and all signal receiving devices work online in real time. The signal receiving device can detect all signal waveforms emitted by the monitoring equipment and the grounding signal generated by the EAST fully superconducting tokamak device.

[0021] Although the above describes the illustrative specific embodiments of the present invention to facilitate those skilled in the art to understand the present invention, and it should be clear that the present invention is not limited to the scope of the specific embodiments, for those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. An online monitoring device for a grounding system, used for an EAST fully superconducting tokamak device, the monitoring device comprising: The monitoring device host comprises a signal generating device and a signal receiving device, and is characterized in that: A signal generator and a signal receiver are installed on each type of grounding wire in the grounding system. The grounding types of the grounding system include: protective grounding, working grounding, shielding grounding, diagnostic grounding, and other grounding. The monitoring device host generates a predetermined type of waveform signal through the signal generator and injects it into the four types of grounding wires respectively. After the signal receiver detects the signal, it is transmitted to the monitoring device host. The monitoring device host compares the signal waveform and makes judgments: When the grounding system is normal, the signal receiving device cannot detect the signal injected by the signal generating device. When the grounding system has multiple grounding points or multiple grounding wires are connected to each other, a closed loop is formed. The signal receiving device monitors the signal sent by the signal generating device, and the monitoring device host automatically performs waveform comparison. If the signal receiving device does not collect the waveform, it means that the grounding system is operating normally; if the waveform collected by the signal receiving device is consistent with the waveform sent by the signal generating device, it means that the type of grounding where the signal receiving device is located has a multi-point grounding fault; if the waveform collected by two or more signal receiving devices is consistent with the waveform sent by the signal generating device, it means that a mixed fault has occurred in these two or more types of grounding wires; if the waveform collected by the signal receiving device is inconsistent with the waveform sent by the signal generating device, it means that the signal is generated by the EAST fully superconducting tokamak device. The above operating conditions are uploaded to the monitoring background in real time, and the fault type is identified, and the corresponding alarm signal is issued at the same time; The grounding online monitoring device emits several different waveforms, including square waves, sawtooth waves, and sine waves, to determine whether the monitoring device detects the signal it emits. If a signal is detected, the type of grounding fault can be determined by waveform comparison. The waveform is adjustable, and any waveform can be selected according to the operating conditions. Each signal generating device cyclically emits signals in turn, and all signal receiving devices work online in real time and receive signals at the same time.

2. The on-line monitoring device for a grounding system according to claim 1, characterized in that: The number of monitoring grounding paths of the online monitoring device is adjustable, that is, monitoring one path, or monitoring multiple paths at the same time; in case of a fault, the fault branch signal receiving device can monitor the signal sent by the device, make a judgment through signal waveform comparison, and determine the fault range and fault type.

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