CN215261858U - Power equipment state diagnostic device - Google Patents

Abstract

The application relates to a power equipment state diagnosis device, which comprises a server, at least one data acquisition module connected with the server, and a plurality of sensors connected with the data acquisition module. The utility model monitors the temperature, partial discharge, mechanical property and vibration property of the switch cabinet in real time, and analyzes the operation condition in multiple dimensions; a plurality of physical quantities can be combined and analyzed, so that the comprehensive judgment on the condition of the switch cabinet is more accurate and the reliability is higher; the cost of periodic troubleshooting of the switch cabinet is saved, the economy of state monitoring is improved, and the timeliness of fault monitoring is greatly improved.

Description

Power equipment state diagnostic device

Technical Field

The utility model belongs to power equipment monitoring field, concretely relates to power equipment state diagnostic device.

Background

For power equipment, the current state maintenance work based on the routine test of periodic power failure has a plurality of defects, although partial detection can realize on-line monitoring, the on-line monitoring is mostly aimed at single state parameters, and the monitoring accuracy is low; the commonly used temperature measurement methods such as infrared and optical fiber have the defects of limited detection range, inconvenient installation and the like.

The partial discharge detection technology has the defects of low accuracy, incapability of monitoring on line, incapability of being suitable for the working condition of a non-all-metal airtight switch cabinet and the like. The operating mechanism state detection technology mostly adopts a displacement sensor, has poor detection sensitivity and limited service life, and cannot carry out online monitoring.

In the domestic research on the state monitoring of the power equipment, compared with large-scale equipment such as a transformer, a generator and the like, the state monitoring and diagnosis research on the switch cabinet body is still in a starting stage. At present, a whole set of system capable of completely monitoring the operation state of the switch cabinet is lacked.

For comprehensive diagnosis of a fault of a switch cabinet, an effective method is still lacked at present, and the health condition of the running state of the switch cabinet cannot be evaluated while monitoring various characteristic parameters of the switch cabinet.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a high tension switchgear multidimension state intelligent monitoring system and method, through carrying out the feature extraction to backstage multidimension data, carry out the temperature again, load current, the relevance analysis of partial discharge value etc. and the same circuit breaker time on the axis of ordinates feature data compare with other circuit breakers of the same kind transversely compare the analysis, through corresponding state parameter assessment equipment health, for the state overhauls provides the foundation, conveniently formulate the maintenance scheme, can change the regular maintenance to equipment in the past like this, maintain for purposefully, the equipment maintenance behind the corresponding data analysis. And power failure is reduced, and the operating efficiency of the power grid equipment is improved.

The technical scheme of the utility model is specifically as follows:

a power equipment state diagnosis device comprises a server, at least one data acquisition module connected with the server, and a plurality of sensors connected with the data acquisition module;

the server comprises a system configuration module, a user management module, a data management module, an alarm module, a health evaluation module and a report generation module;

the sensor comprises a contact video monitoring module, a partial discharge sensor, an alternating current transformer, a Hall current sensor, a vibration sensor, a temperature measurement panel antenna and a temperature and humidity sensor; the partial discharge sensor comprises a TEV sensor and an AE ultrasonic sensor;

the TEV sensor and the AE ultrasonic sensor are arranged on the inner surface of the switch cabinet; the temperature sensor is arranged on the moving contact; the vibration sensor is fixed on the circuit breaker; the AC transformer and the Hall current sensor are clamped on a control circuit of the instrument room.

Further, the server is connected with the communication terminal through the station-side switch.

Furthermore, the data acquisition module is a built-in intelligent acquisition device arranged in each cabinet in the station, monitors and acquires data of all sensors in the cabinet in real time, and uploads the data to the intelligent communication terminal in a wireless or wired mode through an internal communication subnet.

Furthermore, at least one data acquisition module uploads data to a server through an intelligent communication terminal; the communication terminal receives data of all collectors at the station end through a system internal bus, and then is connected with an internal network switch of the substation end through an Ethernet interface of the communication terminal, and the data is sent to the server through a special power internal network.

Furthermore, a temperature and humidity sensor is arranged on a moving contact or an isolation switch contact or a cable end, a receiving antenna is arranged on the inner side wall of a cable chamber or a diplexer chamber, and the specific position is determined according to the safe distance and the space size in the cabinet; the TEV sensor and the AE ultrasonic sensor are arranged in the cable chamber, the TEV sensor is close to a metal seam part in the cabinet body, and the AE ultrasonic sensor faces to a partial discharge and multiple generation part;

the current sensors for monitoring the mechanical characteristics are all arranged in a relay instrument room and correspondingly clamped on coil loops of the opening, closing and energy storage motors; and the other collectors, the communication terminal and the power converter are arranged on a DIN guide rail in the relay instrument room.

Furthermore, the intelligent collector comprises a temperature collection module, a partial discharge collection module, a mechanical characteristic collection module and a vibration collection module;

the temperature acquisition module transmits the temperature information to a temperature measurement management device of the server in real time, records data and judges whether temperature abnormity alarming is needed or not;

the local discharge acquisition module controls the TEV and AE sensors, acquires transient voltage-to-earth signals in the TEV sensors and acoustic emission signals in the AE sensors in real time, analyzes and compares whether abnormal signals exist or not, carries out digital conversion on the signals, and finally uploads the signals to the server to judge whether a current switch cabinet needs to be subjected to local discharge alarm or not;

the mechanical characteristic acquisition module acquires current parameters in the Hall current sensor through monitoring to obtain time, speed and motion process information of a switching-on and switching-off process of the circuit breaker, analyzes whether switching-on and switching-off abnormity exists in the obtained monitoring data, and judges whether mechanical operation abnormity alarming is needed or not;

the vibration acquisition module processes an acquisition signal of the vibration sensor, monitors vibration quantity of XYZ three-axis received by the position of the sensor to obtain three-dimensional vibration information, and judges whether the abnormal vibration exists according to experience and the similarity of normal signals.

Compared with the prior art, the beneficial effects of the utility model are specifically as follows:

the utility model discloses put, mechanical characteristic, vibration characteristic carry out real-time supervision, the analysis operation conditions of multidimension degree to temperature, office of cubical switchboard. Traditional cubical switchboard can only monitor the temperature, and some can only monitor the partial discharge etc. and it is single to monitor the physical quantity, and when environmental change was complicated, the judged result had the deviation easily. The multidimensional state monitoring can combine a plurality of physical quantities for analysis, so that the comprehensive judgment on the condition of the switch cabinet is more accurate, and the reliability is higher; the timeliness of fault monitoring is greatly improved, the method plays an important role in developing artificial intelligence analysis later, the obtained data can be used as an important basis of the smart grid, and the method is very important for smart grid construction.

Drawings

Fig. 1 is a block diagram showing the structure of a system according to the present embodiment;

FIG. 2 is a graph illustrating temperature data monitored in the present embodiment;

FIG. 3 is the TEV signal data monitored in the present embodiment;

FIG. 4 is AE signal data monitored in the present embodiment;

fig. 5 shows the mechanical property data monitored in the present embodiment.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments belong to the protection scope of the present invention.

Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.

As shown in fig. 1, the high voltage switch cabinet multidimensional state intelligent monitoring system of this embodiment includes a server, a plurality of intelligent collectors connected to the server, and a sensor connected to the intelligent collectors. The server comprises a system configuration module, a user management module, a data management module, an alarm module, a health evaluation module and a report generation module, wherein the modules can be common functions of the existing server.

The sensor comprises a contact video monitoring module, a partial discharge sensor, an alternating current transformer, a Hall current sensor, a vibration sensor, a temperature measurement panel antenna and a temperature and humidity sensor; the partial discharge sensor comprises a TEV sensor and an AE ultrasonic sensor.

The intelligent collector is a built-in intelligent collector arranged in each cabinet in the station, monitors and collects data of all sensors in the cabinets in real time, and uploads the data to the intelligent communication terminal in a wireless or wired mode through an internal communication subnet.

The intelligent collector uploads data to the server through the intelligent communication terminal; the communication terminal receives data of all collectors at the station end through a system internal bus, and then is connected with an internal network switch of the substation end through an Ethernet interface of the communication terminal, and the data is sent to the server through a special power internal network.

The sensors of the present embodiment are all the prior art, and the SAW temperature sensor is a component that converts temperature information into electromagnetic wave frequency signals by using the principle of surface acoustic wave temperature measurement. The temperature sensor is a temperature measuring element directly arranged on the surface of a measured object and is responsible for receiving the inquiry radio frequency signal and returning the radio frequency signal with temperature information to the collector. When the temperature sensor works normally, external power supplies such as a battery and a CT loop power supply mode are not needed for supplying power. The signal transmission between the temperature sensor and the temperature collector is realized by wireless electromagnetic waves. The temperature sensor is mounted in a binding mode and detects the temperature of the busbar.

The temperature measurement temperature collector receiving and transmitting antenna sends and receives electromagnetic wave signals to complete signal transmission of the temperature collector and the temperature sensor. The temperature collector is matched with a temperature collector for use, is arranged in a compartment same with the sensor, and is responsible for communicating with the sensor antenna to complete the sending and receiving of the excitation signal and the sensor signal.

The intelligent data collector is 1.10.7PSIM intelligent data collector. The mechanical property mainly measures the opening and closing coil current, the energy storage motor current and the secondary side mutual inductance current of the high-voltage switch cabinet. And a series of related operations in the switch cabinet are triggered by the opening and closing operations of the high-voltage switch cabinet in real time. The energy storage motor is triggered to perform a charging process through switching-on and switching-off operations, and then switching-on and switching-off of a switch cabinet disconnecting link are triggered, so that vibration of the switch cabinet and secondary mutual inductance current change can be caused.

The vibration collector adopts digital interface output and RS485 interface communication, different address codes can be set, and a plurality of sensors are connected in series in a long distance for use together, so that multipoint measurement and data analysis are facilitated. AKE392B is a single crystal silicon capacitive sensor consisting of a micromachined silicon chip, a low power ASIC for signal conditioning, and a microprocessor for storing compensation values.

The module has low power consumption, firm structure and stable output after calibration. The new electronic configuration provides solid state power for reset, providing full protection against overvoltages. The long term stability of the scale factor and typical values of deviation are less than 0.1% over the full range. The module has the characteristics of firm structure, low power consumption, excellent deviation stability and the like, and ensures excellent output reliability.

The temperature acquisition module performs early warning when the highest temperature reaches 60 ℃, and performs emergency warning when the highest temperature exceeds 80 ℃; when the temperature difference between different phases of A, B, C three phases exceeds 30 ℃, alarming for abnormal phase temperature. And when the local discharge acquisition module acquires a TEV or AE signal with the amplitude of more than 40dB, the local discharge acquisition module performs local discharge alarm. And the data acquired by the mechanical characteristic and vibration acquisition module is used for judging the defect abnormity through the background server and returning whether to give an alarm or not.

In the high tension switchgear:

for the temperature characteristics: the temperature measurement range is 0-175 ℃; the temperature measurement error in the temperature measurement range is not more than +/-2 ℃; the resolution is 0.1 ℃; the sampling period is less than or equal to 10 s;

for ultrasonic partial discharge detection performance: the detection sensitivity of the non-contact detector is not more than 40 dB; in a non-contact mode, the frequency is in the range of 20kHz to 60 kHz; the linearity error is not more than +/-20%;

for transient earth voltage method partial discharge detection performance: the frequency range is 3 MHz-100 MHz, and the frequency bandwidth is not less than 20 MHz; the error of linearity is not more than +/-20%; the required error of pulse counting is not more than +/-20 percent;

in this embodiment, for the mechanical characteristics of the circuit breaker:

3 direct current detection channels are used for detecting the current of the switching-off and switching-on coil and the current of the energy storage motor; calculating characteristic parameters such as opening and closing time, period, current and the like; monitoring the states of an energy storage mechanical link and an electrical loop of an energy storage motor; the 3-path alternating current detection channel is used for detecting the current of the secondary side of the current transformer; the atlas displays a current characteristic waveform curve; divide closing coil hall current sensor, energy storage motor hall current sensor: the detection range is 0-10A, and the error is not more than 1%; a secondary side alternating current sensor of the mutual inductor: the detection range is 0-10A, and the error is not more than 1%.

In the embodiment, the temperature and humidity sensor is arranged on the moving contact or the isolating switch contact or the cable end, the receiving antenna is arranged on the inner side wall of the cable chamber or the diplexer chamber, and the specific position is determined according to the safe distance and the space size in the cabinet; the TEV sensor and the AE ultrasonic sensor are arranged in the cable chamber, the TEV sensor is close to a metal seam part in the cabinet body, and the AE ultrasonic sensor faces to a partial discharge and multiple generation part; the current sensors for monitoring the mechanical characteristics are all arranged in a relay instrument room and correspondingly clamped on coil loops of the opening, closing and energy storage motors; and the other collectors, the communication terminal and the power converter are arranged on a DIN guide rail in the relay instrument room.

Specifically, during the installation of this embodiment, to temperature sensor, fixed cubical switchboard should include 6 temperature monitoring points altogether of the three-phase contact that upper and lower isolator and circuit breaker are connected at least. And under the condition that the bus is not powered off, the sensor cannot be installed on the bus side of the upper isolation disconnecting link.

When the sensor is installed on the busbar copper plate, the sensor is installed at a position as close as possible to the position where the disconnecting link contacts the copper plate.

Before the sensor is installed, the positions of ABC three phases are confirmed, the colors of yellow, green and red are displayed on a common busbar, the colors of yellow (A), green (B) and red (C) can be determined according to the colors, and a silica gel ribbon is bound by using the phase color corresponding to the busbar.

A group of sensors has 6 frequency points in total and are installed from top to bottom in sequence from small to large. For example, the three-phase busbar A (433), B (435) and C (436) on the upper surface and the three-phase busbar A (438), B (439) and C (441) on the lower surface of the disconnecting link are sequentially installed by using the frequency points.

The distance between the two sensors is greater than 20 cm: the distance between the sensor and the metal surface is more than 12.5 cm: the sensor and the collector antenna are axially parallel, and the distance is between 40cm and 165 cm.

When the temperature measurement panel antenna is installed, a fixing cabinet panel antenna feeder line labeling sleeve is used for sleeving a white heat-shrinkable tube printed with temperature measurement ANT1 into one end of a feeder line and thermally shrinking the heat-shrinkable tube by using a hot air gun, as shown in the following figure, the white heat-shrinkable tube printed with temperature measurement ANT1 is also sleeved into one end of the feeder line at the other end of the fixing cabinet panel antenna feeder line labeling sleeve and thermally shrinking the heat-shrinkable tube by using the hot air gun, and the aim of distinguishing different feeder lines when an intelligent data collector is accessed is achieved. Similarly, a white heat-shrinkable tube printed with a temperature ANT2 is sleeved on one end of the feeder line, and is heat-shrunk by a hot air gun, and a white heat-shrinkable tube printed with a temperature ANT2 is also sleeved on one end of the feeder line, and is heat-shrunk by a hot air gun. And then, the feeder line connection, wiring and gluing of the panel antenna of the fixed cabinet are carried out.

When installing the partial discharge sensor:

the method comprises the steps of sleeving a white heat-shrinkable tube printed with ultrasonic AE into one end of a feeder line, and thermally shrinking the heat-shrinkable tube by using a hot air gun, wherein the white heat-shrinkable tube printed with the ultrasonic AE is also sleeved into one end of the feeder line at the other end of the feeder line, and the heat-shrinkable tube is thermally shrunk by using the hot air gun, so that different feeder lines can be distinguished when an intelligent data acquisition unit is accessed.

Similarly, a white heat-shrinkable tube printed with the ground electric wave TEV is sleeved on one end of the feeder line and heat-shrunk by a heat gun, and a white heat-shrinkable tube printed with the ground electric wave TEV is also sleeved on the other end of the feeder line and heat-shrunk by a heat gun.

And connecting and wiring the feeder line of the partial discharge sensor, pulling the connected feeder line to a position where the instrument room can be connected with the intelligent data acquisition unit along the wiring groove, and if the intelligent data acquisition unit cannot be pulled to indicate that the feeder line is too short, connecting the extension line of the feeder line and sleeving a corresponding label sleeve.

The purpose of gluing is to fix the partial discharge sensor without displacement. The method comprises the following steps: and (5) after the AB glue is blended, the glue is applied to a magnet base of the panel antenna.

When installing mechanical characteristic sensor, to separating brake, combined floodgate, energy storage motor sensor installation:

and the switching-off mutual inductor, the switching-on mutual inductor and the energy storage motor mutual inductor are all closed-loop Hall current sensors.

Inquiring about the position where the office personnel are installed with the mutual inductors of the switching-off, switching-on and energy storage motors, the office personnel can give the installed line marks, find the corresponding line marks and pass the corresponding line marking cables through the corresponding mutual inductors.

And for the installation of the secondary side current sensor, the secondary side A-phase current transformer, the secondary side B-phase current transformer and the secondary side C-phase current transformer are all open-loop Hall current sensors.

Inquiring the installation position of the current transformer on the secondary side of office personnel, finding out the corresponding line mark, and enabling the corresponding line mark cable to penetrate through the corresponding transformer. The lines of the opening, closing and energy storage motor sensors are three-core shielding lines. The vibration sensing is installed on the side wall of the high-voltage cabinet. And a camera is installed and used for monitoring the disconnecting link.

When the intelligent data collector, the air switch and the power adapter guide rail are installed, the position of the lower air switch, the power adapter and the intelligent data collector which can be installed is selected to fix the electric rotating punching screw for the guide rail in the instrument room.

Install intelligent data collection station, air switch, power adapter on the guide rail, power adapter installation power adapter is on the guide rail, and it faces to paste in air switch. The intelligent data collector is arranged on the guide rail and attached to the power adapter.

As a specific detection example of the present embodiment:

the intelligent data acquisition unit and the air switch and the power supply matched with the intelligent data acquisition unit are installed in an instrument room, after a researched high-voltage switch cabinet multidimensional state online monitoring system is built, partial acquired data are checked, monitoring data in the switch cabinet with the number 905 are called out and checked, and whether abnormal phenomena exist can be found in real time.

Fig. 2 is a temperature data record of a day in a 905 # switch cabinet, the abscissa is time, and the ordinate contains temperature data of A, B, C three-phase upper and lower moving contacts, so that it can be seen that the temperature changes of the three phases are consistent and consistent with the temperature change, and it can be preliminarily determined that there is no temperature abnormality temporarily, and the temperatures are all in the vicinity of the normal value range.

Fig. 3 and 4 show signals of a part of TEV and AE sensors in the collection history in the 905 # switch cabinet, the abscissa shows the collection time, the ordinate in the upper graph shows the pulse number of the TEV, and the lower graph shows the pulse number of the ultrasonic signal. When the number of TEV pulses is large and concentrated and strong ultrasonic signals are accompanied, the partial discharge phenomenon in the switch cabinet is considered to be obvious, and the overhaul and the troubleshooting are arranged as soon as possible.

Fig. 5 shows part of mechanical characteristic data collected in history of switch cabinet # 905, where the abscissa is time and the ordinate is current measured by a sensor. And data change in the closing process shows that the switch cabinet is not abnormal when being opened or closed.

The intelligent switch cabinet monitoring system has the advantages that the intelligent switch cabinet monitoring system can discover measured data of multi-dimensional state monitoring, a series of sensors can construct the whole switch cabinet into an intelligent body, the sensors can diagnose the running state of the current switch cabinet, the monitored data are comprehensively analyzed, the health condition of the switch cabinet can be analyzed from multiple dimensions and multiple angles, and the running reliability of the switch cabinet is improved. Meanwhile, after the data analysis means and method are improved, deeper and more accurate state diagnosis can be provided according to the data.

Claims (6)

1. An electric power equipment state diagnosis device characterized in that: the system comprises a server, at least one data acquisition module connected with the server, and a plurality of sensors connected with the data acquisition module;

the server comprises a system configuration module, a user management module, a data management module, an alarm module, a health evaluation module and a report generation module;

the sensor comprises a contact video monitoring module, a partial discharge sensor, an alternating current transformer, a Hall current sensor, a vibration sensor, a temperature measurement panel antenna and a temperature and humidity sensor; the partial discharge sensor comprises a TEV sensor and an AE ultrasonic sensor;

the TEV sensor and the AE ultrasonic sensor are arranged on the inner surface of the switch cabinet; the temperature sensor is arranged on the moving contact; the vibration sensor is fixed on the circuit breaker; the AC transformer and the Hall current sensor are clamped on a control circuit of the instrument room.

2. The power equipment state diagnostic device according to claim 1, characterized in that: the server is connected with the communication terminal through the station-side switch.

3. The power equipment state diagnostic device according to claim 1, characterized in that: the data acquisition module is a built-in intelligent acquisition device arranged in each cabinet in the station, monitors and acquires data of all sensors in the cabinet in real time, and uploads the data to the intelligent communication terminal in a wireless or wired mode through an internal communication subnet.

4. The power equipment state diagnostic device according to claim 2, characterized in that: at least one data acquisition module uploads data to a server through an intelligent communication terminal; the communication terminal receives data of all collectors at the station end through a system internal bus, and then is connected with an internal network switch of the substation end through an Ethernet interface of the communication terminal, and the data is sent to the server through a special power internal network.

5. The power equipment state diagnostic device according to claim 1, characterized in that: the temperature and humidity sensor is arranged on a moving contact or an isolation switch contact or a cable end, the receiving antenna is arranged on the inner side wall of the cable chamber or the diplexer chamber, and the specific position is determined according to the safe distance and the space size in the cabinet; the TEV sensor and the AE ultrasonic sensor are arranged in the cable chamber, the TEV sensor is close to a metal seam part in the cabinet body, and the AE ultrasonic sensor faces to a partial discharge and multiple generation part;

the current sensors for monitoring the mechanical characteristics are all arranged in a relay instrument room and correspondingly clamped on coil loops of the opening, closing and energy storage motors; and the other collectors, the communication terminal and the power converter are arranged on a DIN guide rail in the relay instrument room.

6. The power equipment state diagnostic device according to claim 2, characterized in that: the intelligent collector comprises a temperature collecting module, a partial discharge collecting module, a mechanical characteristic collecting module and a vibration collecting module;

the temperature acquisition module transmits the temperature information to a temperature measurement management device of the server in real time, records data and judges whether temperature abnormity alarming is needed or not;

the local discharge acquisition module controls the TEV and AE sensors, acquires transient voltage-to-earth signals in the TEV sensors and acoustic emission signals in the AE sensors in real time, analyzes and compares whether abnormal signals exist or not, carries out digital conversion on the signals, and finally uploads the signals to the server to judge whether a current switch cabinet needs to be subjected to local discharge alarm or not;

the mechanical characteristic acquisition module acquires current parameters in the Hall current sensor through monitoring to obtain time, speed and motion process information of a switching-on and switching-off process of the circuit breaker, analyzes whether switching-on and switching-off abnormity exists in the obtained monitoring data, and judges whether mechanical operation abnormity alarming is needed or not;

the vibration acquisition module processes an acquisition signal of the vibration sensor, monitors vibration quantity of XYZ three-axis received by the position of the sensor to obtain three-dimensional vibration information, and judges whether the abnormal vibration exists according to experience and the similarity of normal signals.

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