A centralized control device for online monitoring of power grid phase regulator

Abstract

The invention relates to an online monitoring centralized control device for a power grid phase regulator, belonging to the field of phase regulators. A vibration monitoring module, a partial discharge monitoring module, a shaft current monitoring module and a rotor winding inter-turn short circuit monitoring module are used to respectively monitor vibration, partial discharge, rotor winding inter-turn short circuit and shaft current, and a CPU module is used to monitor faults occurring in the phase regulator according to an acceleration digital signal, a capacitance digital signal, a polarity digital signal, a shaft current digital signal or real-time operation data of the phase regulator. The faults include vibration exceeding standard faults, partial discharge faults, rotor winding inter-turn short circuit faults and shaft current exceeding standard faults. The monitoring range covers the main fault types of the phase regulator, and accurate and efficient integrated monitoring of the main fault types of the phase regulator is achieved.

Description

Technical Field

[0001] The invention relates to the field of phase regulators, and in particular to an online monitoring and centralized control device for phase regulators in power grids. Background Art

[0002] Phase regulator is one of the key power equipment in the power transmission and distribution system, and its operating reliability is directly related to the safe and stable operation of the power grid. Some faults of phase regulator may have some adverse effects on the unit, such as increased or excessive vibration, partial discharge, short-circuit fault between turns of rotor winding, and excessive shaft current. It is very necessary to carry out online monitoring of these faults. Once the signs of fault are found, early warning can be issued in time to avoid long-term or further deterioration of the fault and cause serious consequences. This is of great significance to ensure the normal operation of the phase regulator.

[0003] However, the existing phase-shifting machine monitoring systems have three widespread problems: first, the monitoring means are single, and only a certain independent operating parameter of the phase-shifting machine is monitored through a single monitoring means and method. This monitoring means can cover few types of faults and is not comprehensive enough; second, the monitoring means are inefficient, and the targeted phase-shifting machine operating parameters are not the parameters of common phase-shifting machine faults, and the resulting faults are extremely rare. The monitoring efficiency is too low, or there are one or more inefficient monitoring means among the multiple monitoring means combined; third, the system is complex. Although multiple fault parameters are combined, the various systems are independent of each other. Too many sensors and data acquisition terminals are installed on the unit, which makes the system too complex and difficult to install.

[0004] In view of the technical background and existing problems, it is necessary to develop an integrated phase-shifting machine online monitoring device with accurate anchor points and efficient monitoring. Summary of the invention

[0005] The object of the present invention is to provide an online monitoring and control device for power grid phase regulators, so as to accurately and efficiently monitor the main fault types of phase regulators in an integrated manner.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A power grid phase regulator online monitoring centralized control device, the device comprising: a CPU module, a vibration monitoring module, a partial discharge monitoring module, a shaft current monitoring module and a rotor winding inter-turn short circuit monitoring module;

[0008] The vibration monitoring module, the partial discharge monitoring module, the shaft current monitoring module and the rotor winding inter-turn short circuit monitoring module are all connected to the CPU module;

[0009] The vibration monitoring module is used to receive the acceleration analog signal, and convert the acceleration analog signal into an acceleration digital signal and transmit it to the CPU module;

[0010] The partial discharge monitoring module is used to receive a capacitance analog signal and a polarity analog signal, and convert the capacitance analog signal into a capacitance digital signal, and convert the polarity analog signal into a polarity digital signal before transmitting it to the CPU module;

[0011] The shaft current monitoring module is used to receive the spindle current analog signal, convert the spindle current analog signal into a shaft current digital signal and transmit it to the CPU module;

[0012] The rotor winding inter-turn short-circuit monitoring module is used to receive the real-time operation data of the phase regulator monitoring system, and transmit the real-time operation data to the CPU module after screening;

[0013] The CPU module is used to monitor faults of the phase regulator according to the acceleration digital signal, the capacitance digital signal, the polarity digital signal, the shaft current digital signal or the screened real-time operation data.

[0014] Optionally, the device further comprises: a chassis;

[0015] The CPU module, vibration monitoring module, partial discharge monitoring module, shaft current monitoring module and rotor winding inter-turn short-circuit monitoring module are all located inside the chassis and are fixed to studs inside the chassis by screws respectively.

[0016] Optionally, the device further comprises: a first standard interface, a second standard interface, a third standard interface and a fourth standard interface;

[0017] The first standard interface, the second standard interface, the third standard interface and the fourth standard interface are all arranged on the lower side of the chassis;

[0018] The first standard interface is connected to the vibration monitoring module, the second standard interface is connected to the partial discharge monitoring module, the third standard interface is connected to the shaft current monitoring module, and the fourth standard interface is connected to the rotor winding inter-turn short circuit monitoring module.

[0019] Optionally, the device further comprises: a first communication module, a second communication module, a third communication module, a fifth standard interface, a sixth standard interface and a seventh standard interface;

[0020] The first communication module, the second communication module and the third communication module are all arranged inside the chassis, and the fifth standard interface, the sixth standard interface and the seventh standard interface are all arranged on the upper side of the chassis;

[0021] The first communication module, the second communication module and the third communication module are all connected to the CPU module;

[0022] The first communication module is used to transmit the monitoring data in the CPU module to the host computer or server through the fifth standard interface; the monitoring data includes acceleration digital signal, capacitance digital signal, polarity digital signal, shaft current digital signal or filtered real-time operation data;

[0023] The second communication module is used to transmit the monitoring data in the CPU module to the phase regulator monitoring system or the data acquisition and monitoring control system through the sixth standard interface;

[0024] The third communication module is used to connect to an external device via a seventh standard interface.

[0025] Optionally, the fifth standard interface is a network interface, the sixth standard interface is an RS485 interface, and the seventh standard interface is a network interface, an RS485 interface or a USB interface.

[0026] Optionally, the device further comprises: a power supply module;

[0027] The power module is arranged inside the chassis;

[0028] The power supply module is respectively connected with the CPU module, the vibration monitoring module, the partial discharge monitoring module, the shaft current monitoring module and the rotor winding inter-turn short circuit monitoring module;

[0029] The power supply module is used to convert 220V AC power into rated DC power to supply power to the CPU module, vibration monitoring module, partial discharge monitoring module, shaft current monitoring module and rotor winding inter-turn short circuit monitoring module.

[0030] Optionally, the device further includes: an operation module and a display module;

[0031] The operation module and the display module are both arranged in the middle of the chassis;

[0032] The operation module is connected to the CPU module, and the operation module is used to set the alarm threshold in the CPU module and switch the display;

[0033] The CPU module is connected to the display module, and the CPU module is used to issue a fault warning according to the alarm threshold value set by the operation module, and transmit the corresponding monitoring data to the display module for display according to the switching display set by the operation module.

[0034] Optionally, the chassis includes: a bottom shell, an upper cover and a hinge;

[0035] The upper cover is connected to the bottom shell by a hinge, and the upper cover is opened and closed by the hinge;

[0036] A window is provided in the middle of the upper cover; the operation module and the display module both correspond to the window. After the upper cover and the bottom shell are closed, the operation module and the display module are both exposed.

[0037] Optionally, a sealing strip slot is provided on the bottom shell;

[0038] The sealing strip slot is used for installing a waterproof sealing strip.

[0039] Optionally, the CPU module is used to determine that a vibration exceeding the standard fault has occurred in the phase regulator when the acceleration digital signal is greater than the acceleration threshold;

[0040] The CPU module is also used to denoise the capacitance digital signal and the polarity digital signal, and when the polarity of the denoised capacitance digital signal is opposite to the polarity of the denoised polarity digital signal, it is judged to be a partial discharge signal generated inside the phase regulator, and a partial discharge fault occurs in the phase regulator;

[0041] The CPU module is also used to determine that a shaft current exceeding the limit fault occurs in the phase regulator when the shaft current digital signal is greater than the current threshold;

[0042] The CPU module is also used to determine whether a rotor winding inter-turn short circuit fault occurs in the phase regulator according to the screened real-time operation data.

[0043] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0044] The present invention discloses an online monitoring centralized control device for a power grid phase regulator. The device adopts a vibration monitoring module, a partial discharge monitoring module, a shaft current monitoring module and a rotor winding inter-turn short circuit monitoring module to respectively monitor vibration, partial discharge, rotor winding inter-turn short circuit and shaft current, and utilizes a CPU module to monitor faults occurring in the phase regulator according to an acceleration digital signal, a capacitance digital signal, a polarity digital signal, a shaft current digital signal or real-time operation data of the phase regulator. The faults include vibration exceeding standard faults, partial discharge faults, rotor winding inter-turn short circuit faults and shaft current exceeding standard faults. The monitoring range covers the main fault types of the phase regulator, thereby realizing accurate and efficient integrated monitoring of the main fault types of the phase regulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0046] Figure 1A schematic structural diagram of an online monitoring centralized control device for a power grid phase regulator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] 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 only 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.

[0048] The object of the present invention is to provide an online monitoring and control device for power grid phase regulators, so as to accurately and efficiently monitor the main fault types of phase regulators in an integrated manner.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] The embodiment of the present invention provides a centralized control device for online monitoring of power grid phase regulators, such as Figure 1 As shown, it includes: a CPU module, a vibration monitoring module, a partial discharge monitoring module, a shaft current monitoring module and a rotor winding inter-turn short-circuit monitoring module. The vibration monitoring module, the partial discharge monitoring module, the shaft current monitoring module and the rotor winding inter-turn short-circuit monitoring module are all connected to the CPU module. The vibration monitoring module is used to receive the acceleration analog signal, and convert the acceleration analog signal into an acceleration digital signal and then transmit it to the CPU module. The partial discharge monitoring module is used to receive the capacitance analog signal and the polarity analog signal, and convert the capacitance analog signal into a capacitance digital signal, and convert the polarity analog signal into a polarity digital signal and then transmit it to the CPU module. The shaft current monitoring module is used to receive the main shaft current analog signal, and convert the main shaft current analog signal into a shaft current digital signal and then transmit it to the CPU module. The rotor winding inter-turn short-circuit monitoring module is used to receive the real-time operation data of the phase shifter monitoring system, and transmit the real-time operation data to the CPU module after screening. The CPU module is used to monitor the faults of the phase shifter according to the acceleration digital signal, the capacitance digital signal, the polarity digital signal, the shaft current digital signal or the screened real-time operation data.

[0051] Among them, the main functions of the CPU module are:

[0052] ① The CPU of the lower computer performs general processing on the data when transmitting the monitoring data to the upper computer system through the communication module, such as synchronization, encoding, and packaging.

[0053] ② When the acceleration digital signal is greater than the acceleration threshold, it is determined that the phase regulator has a vibration failure that exceeds the standard.

[0054] ③ A denoising processing algorithm is used to denoise the capacitance digital signal and the polarity digital signal, and when the polarity of the denoised capacitance digital signal is opposite to the polarity of the denoised polarity digital signal, it is judged as a partial discharge signal generated inside the phase modulator, and a partial discharge failure occurs in the phase modulator.

[0055] The denoising principle is: each monitoring unit of the phase regulator is equipped with two partial discharge measurement sensors, and the polarity of the collected high-frequency pulses is compared at the same time. The high-frequency pulses from different directions have different output polarities after passing through the two sets of measurement sensors, so the external noise signal can be removed.

[0056] The principle of partial discharge fault judgment is: when the measurement signal comes from outside the phase modulator, the positive and negative polarities of the high-frequency pulse signals collected by the GPCS polarity identification measurement sensor and the capacitive coupling sensor are consistent, and the CPU judges it as a noise signal; when the measurement signal comes from inside the phase modulator, the positive and negative polarities of the high-frequency pulse signals collected by the GPCS polarity identification measurement sensor and the capacitive coupling sensor are exactly opposite, and the CPU judges it as a partial discharge signal generated inside the phase modulator.

[0057] ④ When the shaft current digital signal is greater than the current threshold, it is determined that the phase regulator has a shaft current exceeding the limit fault;

[0058] ⑤ Determine whether the phase regulator has a rotor winding inter-turn short circuit fault based on the screened real-time operation data.

[0059] The method for determining a rotor winding inter-turn short circuit fault is not limited to only one method, and all existing methods for determining an inter-turn short circuit are applicable here.

[0060] Reference Figure 1 The grid phase regulator online monitoring and control device also includes: a chassis, a standard interface, a communication module, an operation module, a display module and a power module.

[0061] (1) Chassis

[0062] The chassis is made of but not limited to cast aluminum. The chassis has a bottom shell and an upper cover. The upper cover can be opened and closed by hinges. A sealing strip slot is provided on the chassis shell, and a waterproof sealing strip can be installed. The chassis has waterproof and explosion-proof effects. All modules are located inside the chassis and fixed to the studs inside the chassis by screws.

[0063] (2) Standard interface

[0064] There are 7 standard interfaces, which are respectively set on the upper and lower sides of the chassis. The standard interfaces adopt but are not limited to aviation interfaces, which are easy to connect and install.

[0065] The four standard interfaces on the lower side are the first standard interface, the second standard interface, the third standard interface and the fourth standard interface from left to right. The first standard interface is connected to the vibration monitoring module internally, and the first standard interface is connected to the acceleration sensor externally. The second standard interface is connected to the partial discharge monitoring module internally, and the second standard interface is connected to the external coupling capacitance sensor and the polarity identification measurement sensor externally. The third standard interface is connected to the shaft current monitoring module internally, and the third standard interface is connected to the shaft current sensor externally. The fourth standard interface is connected to the rotor winding inter-turn short circuit monitoring module internally, and the fourth standard interface is connected to the phase shifter DCS (Distributed Control System) externally.

[0066] The three standard interfaces on the upper side are the fifth standard interface, the sixth standard interface and the seventh standard interface from left to right. The fifth standard interface is connected to the first communication module inside the chassis, and the fifth standard interface is connected to the host computer system / server outside the chassis. The sixth standard interface is connected to the second communication module inside, and the sixth standard interface is connected to the DCS system or the SCADA system outside. The seventh standard interface is connected to the third communication module inside, and the seventh standard interface is connected to the external device outside.

[0067] (3) Communication module

[0068] There are three communication modules arranged in parallel: communication module 1 (first communication module), communication module 2 (second communication module) and communication module 3 (third communication module).

[0069] The communication module 1 communicates with the host computer system / server through the network interface based on the TCP / IP protocol, and transmits the data obtained by the monitoring module to the host computer system / server;

[0070] The communication module 2 communicates with the DCS system / SCADA system based on the MODBUS RTU protocol through the RS485 interface, and transmits the data obtained by the monitoring module to the DCS system / SCADA system;

[0071] The communication module 3 is equipped with an additional network interface, an additional RS485 interface and a USB interface for communicating with other possible external devices.

[0072] (4) Operation module and display module

[0073] The display and operation module consists of a liquid crystal display and operation buttons. It is connected to the CPU module and the power module. It is located in the middle of the chassis and corresponds to the window on the chassis cover. When the chassis cover is closed, the display and operation module is exposed to the outside. The monitoring data obtained by the CPU can be displayed on the spot, and basic setting operations such as alarm threshold setting and display switching can be performed.

[0074] (5) Power module

[0075] The power module is connected to the 220V AC power supply externally and to all other modules internally. It isolates, filters, and reduces the voltage of the input AC power before outputting the rated DC power to power all other modules.

[0076] The technical effects of the online monitoring and centralized control device for power grid phase regulators provided by the present invention are as follows:

[0077] 1) Accurately select four monitoring methods: vibration, partial discharge, rotor winding inter-turn short circuit and shaft current. The monitoring range covers the main fault types of phase regulators, with good monitoring effect, strong pertinence and wide coverage;

[0078] 2) The integration of four monitoring systems and three-way communication devices avoids the installation of too many data acquisition terminals on the unit, reduces the complexity of the system to the greatest extent, improves the operating efficiency of the system, and simplifies the on-site installation;

[0079] 3) Standardization of external interfaces also simplifies on-site installation;

[0080] 4) The communication means are rich and independent, ensuring the compatibility and stability of data upload;

[0081] 5) It has local display and operation functions, which is convenient for on-site inspection and operation.

[0082] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0083] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A power grid phase regulator online monitoring and control device, characterized in that: The device comprises: a CPU module, a vibration monitoring module, a partial discharge monitoring module, an axis current monitoring module and a rotor winding inter-turn short circuit monitoring module; The vibration monitoring module, the partial discharge monitoring module, the shaft current monitoring module and the rotor winding inter-turn short circuit monitoring module are all connected to the CPU module; The vibration monitoring module is used to receive the acceleration analog signal, and convert the acceleration analog signal into an acceleration digital signal and transmit it to the CPU module; The partial discharge monitoring module is used to receive a capacitance analog signal and a polarity analog signal, and convert the capacitance analog signal into a capacitance digital signal, and convert the polarity analog signal into a polarity digital signal before transmitting it to the CPU module; The shaft current monitoring module is used to receive the spindle current analog signal, convert the spindle current analog signal into a shaft current digital signal and transmit it to the CPU module; The rotor winding inter-turn short-circuit monitoring module is used to receive the real-time operation data of the phase regulator monitoring system, and transmit the real-time operation data to the CPU module after screening; The CPU module is used to monitor faults of the phase regulator according to the acceleration digital signal, the capacitance digital signal, the polarity digital signal, the shaft current digital signal or the screened real-time operation data.

2. The online monitoring and centralized control device for power grid phase regulator according to claim 1, characterized in that: The device also includes: a chassis; The CPU module, vibration monitoring module, partial discharge monitoring module, shaft current monitoring module and rotor winding inter-turn short-circuit monitoring module are all located inside the chassis and are fixed to studs inside the chassis by screws respectively.

3. The online monitoring and centralized control device for power grid phase regulator according to claim 2, characterized in that: The device also includes: a first standard interface, a second standard interface, a third standard interface and a fourth standard interface; The first standard interface, the second standard interface, the third standard interface and the fourth standard interface are all arranged on the lower side of the chassis; The first standard interface is connected to the vibration monitoring module, the second standard interface is connected to the partial discharge monitoring module, the third standard interface is connected to the shaft current monitoring module, and the fourth standard interface is connected to the rotor winding inter-turn short circuit monitoring module.

4. The online monitoring and centralized control device for power grid phase regulator according to claim 2, characterized in that: The device further comprises: a first communication module, a second communication module, a third communication module, a fifth standard interface, a sixth standard interface and a seventh standard interface; The first communication module, the second communication module and the third communication module are all arranged inside the chassis, and the fifth standard interface, the sixth standard interface and the seventh standard interface are all arranged on the upper side of the chassis; The first communication module, the second communication module and the third communication module are all connected to the CPU module; The first communication module is used to transmit the monitoring data in the CPU module to the host computer or server through the fifth standard interface; the monitoring data includes acceleration digital signal, capacitance digital signal, polarity digital signal, shaft current digital signal or filtered real-time operation data; The second communication module is used to transmit the monitoring data in the CPU module to the phase regulator monitoring system or the data acquisition and monitoring control system through the sixth standard interface; The third communication module is used to connect to an external device via a seventh standard interface.

5. The online monitoring and centralized control device for power grid phase regulator according to claim 4, characterized in that: The fifth standard interface is a network interface, the sixth standard interface is an RS485 interface, and the seventh standard interface is a network interface, an RS485 interface or a USB interface.

6. The online monitoring and centralized control device for power grid phase regulator according to claim 2, characterized in that: The device also includes: a power module; The power module is arranged inside the chassis; The power supply module is respectively connected with the CPU module, the vibration monitoring module, the partial discharge monitoring module, the shaft current monitoring module and the rotor winding inter-turn short circuit monitoring module; The power supply module is used to convert 220V AC power into rated DC power to supply power to the CPU module, vibration monitoring module, partial discharge monitoring module, shaft current monitoring module and rotor winding inter-turn short circuit monitoring module.

7. The online monitoring and centralized control device for power grid phase regulator according to claim 2, characterized in that: The device also includes: an operation module and a display module; The operation module and the display module are both arranged in the middle of the chassis; The operation module is connected to the CPU module, and the operation module is used to set the alarm threshold in the CPU module and switch the display; The CPU module is connected to the display module, and the CPU module is used to issue a fault warning according to the alarm threshold value set by the operation module, and transmit the corresponding monitoring data to the display module for display according to the switching display set by the operation module.

8. The online monitoring and centralized control device for power grid phase regulator according to claim 7, characterized in that: The chassis comprises: a bottom shell, an upper cover and hinges; The upper cover is connected to the bottom shell by a hinge, and the upper cover is opened and closed by the hinge; A window is provided in the middle of the upper cover; the operation module and the display module both correspond to the window. After the upper cover and the bottom shell are closed, the operation module and the display module are both exposed.

9. The online monitoring and centralized control device for power grid phase regulator according to claim 8, characterized in that: The bottom shell is provided with a sealing strip slot; The sealing strip slot is used for installing a waterproof sealing strip.

10. The online monitoring and centralized control device for power grid phase regulator according to claim 1, characterized in that: The CPU module is used to determine that the phase regulator has a vibration failure exceeding the standard when the acceleration digital signal is greater than the acceleration threshold; The CPU module is also used to denoise the capacitance digital signal and the polarity digital signal, and when the polarity of the denoised capacitance digital signal is opposite to the polarity of the denoised polarity digital signal, it is judged to be a partial discharge signal generated inside the phase regulator, and a partial discharge fault occurs in the phase regulator; The CPU module is also used to determine that a shaft current exceeding the limit fault occurs in the phase regulator when the shaft current digital signal is greater than the current threshold; The CPU module is also used to determine whether a rotor winding inter-turn short circuit fault occurs in the phase regulator according to the screened real-time operation data.

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