CN112098829A - FTU-based terminal and method for monitoring service life of power distribution switch - Google Patents
FTU-based terminal and method for monitoring service life of power distribution switch Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention provides a method for monitoring the service life of a power distribution switch based on an FTU (fiber to the user Unit), which comprises an AD alternating current sampling module, an AD direct current sampling module and an MCU (microprogrammed control Unit), wherein the MCU is respectively connected with an open circuit loop module and an open circuit loop module through GPIOs (general purpose input output), the MCU is sequentially connected with a Fourier type calculation module and a direct current amplitude monitoring module to form a series loop, the MCU is respectively connected with a real-time wave recording module, the AD alternating current sampling module, the AD direct current sampling module, a communication interface module for debugging and using equipment, a remote master station and a local maintenance tool and a switch mechanical service life monitoring module for alarming the service life of a switch, the open circuit module consists of an external switching value node, a current limiting resistor and a photoelectric coupler, and the external switching value node is sequentially connected with the current limiting resistor and the photoelectric coupler, the invention monitors the action state of, the real-time monitoring of the service life of the switch is realized.
Description
Technical Field
The invention relates to the technical field of service life monitoring of power distribution switches, in particular to a terminal and a method for monitoring service life of a power distribution switch based on an FTU (fiber to the Home).
Background
The switching-on and switching-off relays in the power distribution switches have certain service lives, and if the action times of the relays exceed the maximum action times, the reliability of the action of the switches can be influenced, and the harmfulness is high.
In the prior art, the service life monitoring of the power distribution switch is usually connected through an actual wireless or wired communication technology, and the action state of the switch cannot be recorded in real time; when the module is externally connected, objective reasons of construction and cost exist, the module cannot be popularized, and the service life of a terminal switch cannot be effectively monitored.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a terminal and a method for monitoring the service life of a power distribution switch based on an FTU (fiber to the Unit).
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a terminal of distribution switch life-span monitoring based on FTU, includes AD interchange sampling module, AD direct current sampling module and MCU, MCU links to each other with division circuit loop module, division circuit loop module respectively through GPIO, MCU links to each other with Fourier's formula calculation module, direct current alternating current amplitude monitoring module in proper order, constitutes a series circuit, MCU respectively with real-time recording module, AD interchange sampling module, AD direct current sampling module, be used for equipment and remote main website and local maintenance tool debugging to use communication interface module and be used for the switch mechanical life monitoring module of switch life alarm.
Furthermore, the open-circuit electrical loop module is composed of an external switching value node, a current-limiting resistor and a photoelectric coupler, and the external switching value node is sequentially connected with the current-limiting resistor and the photoelectric coupler.
Further, the AD direct current sampling module is used for 8-path 16-bit AD differential acquisition.
A method for monitoring service life of a power distribution switch based on an FTU (fiber to the Home) comprises the following steps:
the method comprises the following steps: switch operation and action data acquisition
Three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current during operation of the power distribution switch are respectively collected through an AD (analog-digital) alternating current sampling module;
voltage and current of a switch during switching on and switching off and energy storage of the switch are respectively collected through an AD direct current sampling module, and voltage and current waveforms of a switching-on and switching-off loop and voltage and current waveforms of an energy storage loop are recorded through a real-time wave recording module;
step two: switch operation data collection and action times statistics
The operation of the power distribution switch is calculated in real time through a Fourier type calculation module, and an opening and closing position signal and an energy storage signal of the operation of the switch are acquired in real time through an opening and closing electric loop module;
the switching-on and switching-off voltage and current recording waves during each action of the switch, the voltage and current recording wave forms during the energy storage of the switch, the voltage and current wave forms of a switching-on and switching-off loop are captured by the real-time recording module, the total times of the actions of the power distribution switch are counted by the MCU,
the number of the switching-on and switching-off wave recording points is not less than 4000 points per second, the wave recording starting condition comprises that the wave recording starting condition exceeds the starting threshold value of the operating power supply current, or the terminal sends a switching-on and switching-off operation command, 200ms seconds after starting, the wave recording is finished before 50ms including out-of-limit,
the number of recording points is not less than 500 points per second when the switch stores energy, the recording starting condition is that the current starting threshold value of the energy storage loop is exceeded or the switch-on outlet is protected, 15s after starting, including 100ms before the threshold is out of limit, and the recording is finished;
step three: statistics of switch actuation time
When the switch is switched on and off and the energy storage action is carried out, the current starting time in the wave recording is recorded until the complete switching-on or switching-off of the switch is received, the electric loop module is switched on to remotely feed back the MCU, and the MCU calculates the actual switching-on and switching-off and energy storage action time of the switch;
step four: switch monitoring data acquisition analysis
When the voltage, the instantaneous maximum peak value and the average voltage of the current, the current and the energy storage action of the switching-on coil are divided by the direct current and alternating current amplitude monitoring module, the voltage, the instantaneous maximum peak value and the average voltage of the current and the current recording waveform of the energy storage coil are obtained, and the obtained data are analyzed by the MCU;
step five: switch life prediction
Through the analysis of the opening and closing wave recording data, the opening and closing action times of the switch are too many, the actual action time is longer and longer, the reliability of the opening and closing action becomes lower and exceeds a set time fixed value, and the early warning is sent out in advance by the switch mechanical life monitoring module.
Through the analysis of the energy storage wave recording data, the energy storage mechanism has more and longer time for completely storing energy due to more times of actions, so that the automatic functions of reclosing and local feeder are influenced, a set time fixed value is exceeded, and early warning is sent out in advance by the switch mechanical life monitoring module.
Compared with the prior art, the FTU-based terminal method for monitoring the service life of the power distribution switch has the beneficial effects that:
1. the invention adds a real-time wave recording module to the existing FTU power distribution switch for voltage and current wave recording, can monitor the action state of the switch in real time through the function of predicting the action state of the switch in real time, provides the function of on-line monitoring of the service life of the switch, and can realize the monitoring of the service life of the switch without external construction and debugging.
2. The invention can record the action state of the switch in real time through the communication interface module based on the actual wireless or wired communication technology.
3. According to the invention, by adding the switch mechanical life monitoring module, the alarm can be given after the switch is used for monitoring the switch life in time, and the switch can be replaced in time.
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The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:
fig. 1 is a schematic diagram illustrating an internal structure of a method for monitoring lifetime of an FTU-based power distribution switch according to an embodiment of the present invention;
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
An embodiment according to the present invention is shown in connection with fig. 1. A terminal for monitoring service life of a power distribution switch based on an FTU (fiber to the Unit) comprises an AD alternating current sampling module, an AD direct current sampling module and an MCU (microprogrammed control Unit), wherein the MCU is respectively connected with an open circuit loop module and an open circuit loop module through GPIOs (general purpose input/output), the open circuit electrical loop is composed of a selection photoelectric coupler, a remote control photoelectric coupler and a relay, when a CPU (central processing unit) sends an on-off signal, the selection photoelectric coupler is conducted, a selection power supply + is conducted and kept with a control power supply +, then the CPU sends a remote control signal, the corresponding remote control photoelectric coupler is conducted, the remote control power supply + is conducted with the selection power supply +, namely is conducted with the control power supply +, both sides of a relay coil are electrified at the moment, corresponding contacts act to realize on-off and on operations of the switch, the MCU is sequentially connected with a Fourier type calculation module and a direct current alternating current amplitude monitoring, The device comprises an AD direct current sampling module, a communication interface module for debugging and using the device, a remote master station and a local maintenance tool, and a switch mechanical life monitoring module for switching life alarm.
The open-circuit electric loop module is composed of an external switching value node, a current-limiting resistor and a photoelectric coupler, the external switching value node is sequentially connected with the current-limiting resistor and the photoelectric coupler, an external switch opening and closing signal and an energy storage signal are collected through the external switching value node, and the collected original signal is sent to the MCU for real-time calculation after being filtered through the current-limiting resistor. MCU model: and RT 1064.
The AD direct current sampling module is 8-path 16-bit AD differential acquisition, the AD direct current sampling module is connected with the high-pass filtering module, the AD direct current sampling module is used for acquiring switch opening and closing and switch energy storage loop coil voltage and current, and the acquired original signals are transmitted to the MCU for real-time sampling calculation after being filtered by the high-pass filtering module.
In this embodiment, when detecting the service life of the switch, as shown in fig. 1, firstly, the operation and action data of the switch are acquired: three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current during operation of the power distribution switch are respectively collected through an AD (analog-digital) alternating current sampling module;
voltage and current of switch closing, separating brake and switch energy storage are respectively collected through the AD direct current sampling module, when the switch is switched on and off, voltage and current of a switching on and off loop are recorded through the real-time wave recording module, the number of wave recording points is not less than 4000 points per second, the wave recording starting condition comprises that the wave recording starting condition exceeds an operation power supply current starting threshold value, or a terminal sends a switching on and off operation command, the ending condition is 200ms seconds after starting, 50ms before exceeding the limit is contained, and the wave recording data comprises operation voltage and current during switching on and off action.
When the switch stores energy, the voltage and current waveforms of the energy storage loop are recorded through the real-time wave recording module, the number of wave recording points is not less than 500 points per second, the wave recording starting condition is that the wave recording starting condition exceeds the current starting threshold value of the energy storage loop or protects a closing outlet, the ending condition is 15s after starting, the wave recording data comprises the energy storage voltage and the current before exceeding the limit, and the wave recording data comprises the energy storage voltage and the current.
Secondly, collecting switch operation data and counting the operation times: the operation of the power distribution switch is calculated in real time through a Fourier calculation module,
the method comprises the steps that an electric loop module is switched on, and opening and closing position signals and energy storage signals of switch operation are collected in real time;
the switching-on and switching-off voltage and current recording waves when the switch acts each time are captured through the real-time recording module, the voltage and current recording waves when the switch stores energy are recorded, and the MCU counts the total times of the actions of the power distribution switch.
Counting the switching action time: the switch is opened into the electric loop module to feed back the MCU remote signaling when the switch is switched on and off and the energy storage action are carried out, the current starting time begins by recording the recording wave recording until the complete switching on or switching off of the switch is received, and the MCU calculates the actual action time of the switching on and off and the energy storage of the switch.
Switch monitoring data acquisition and analysis: when the voltage of the switching-on coil, the instantaneous maximum peak value and the average voltage of the current, the current and the energy storage action are divided by the direct current and alternating current amplitude monitoring module, the voltage, the instantaneous maximum peak value and the average voltage of the current and the current recording waveform of the energy storage coil are obtained, and the obtained data are analyzed by the MCU.
And finally, predicting the service life of the switch: through divide-shut brake recording data analysis, switch divide-shut brake action number of times is too much, and the service life is overlength, leads to actual action time longer and longer, and when this time surpassed the time definite value of settlement after, the reliability of switch action will become low, and the risk grow is sent out the early warning in advance by monitoring devices.
Through energy storage record ripples data analysis, energy storage mechanism is because the action number of times is many for the age overlength leads to the time of complete energy storage longer and longer more, when this time surpasss behind the time definite value of settlement, will influence reclosing and the automatic function of feeder on the spot, and the hidden danger is great, sends the early warning in advance by monitoring device.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (4)
1. The utility model provides a terminal of distribution switch life-span monitoring based on FTU, its characterized in that, including AD interchange sampling module, AD direct current sampling module and MCU, MCU passes through GPIO respectively with open circuit loop module, open circuit loop module and links to each other, MCU links to each other with formula calculation module, direct current alternating current amplitude monitoring module in proper order, constitutes a series circuit, MCU respectively with real-time recording module, AD interchange sampling module, AD direct current sampling module, be used for equipment and remote main website and local maintenance tool debugging to use communication interface module and be used for the switch mechanical life monitoring module of switch life alarm.
2. The FTU-based terminal for monitoring the service life of a power distribution switch according to claim 1, wherein the open electrical loop module comprises an external switching value node, a current limiting resistor and a photoelectric coupler, and the external switching value node is connected with the current limiting resistor and the photoelectric coupler in sequence.
3. An FTU-based power distribution switch lifetime monitoring terminal as claimed in claim 1, wherein the AD DC sampling module is an 8-way 16-bit AD differential acquisition.
4. A method for monitoring service life of a power distribution switch based on an FTU (fiber to the Home) is characterized by comprising the following steps:
the method comprises the following steps: switch operation and action data acquisition
Three-phase voltage, zero-sequence voltage, three-phase current and zero-sequence current during operation of the power distribution switch are respectively collected through an AD (analog-digital) alternating current sampling module;
voltage and current of a switch during switching on and switching off and energy storage of the switch are respectively collected through an AD direct current sampling module, and voltage and current waveforms of a switching-on and switching-off loop and voltage and current waveforms of an energy storage loop are recorded through a real-time wave recording module;
step two: switch operation data collection and action times statistics
The operation of the power distribution switch is calculated in real time through a Fourier type calculation module, and an opening and closing position signal and an energy storage signal of the operation of the switch are acquired in real time through an opening and closing electric loop module;
the switching-on and switching-off voltage and current recording waves during each action of the switch, the voltage and current recording wave forms during the energy storage of the switch, the voltage and current wave forms of a switching-on and switching-off loop are captured by the real-time recording module, the total times of the actions of the power distribution switch are counted by the MCU,
the number of the switching-on and switching-off wave recording points is not less than 4000 points per second, the wave recording starting condition comprises that the wave recording starting condition exceeds the starting threshold value of the operating power supply current, or the terminal sends a switching-on and switching-off operation command, 200ms seconds after starting, the wave recording is finished before 50ms including out-of-limit,
the number of recording points is not less than 500 points per second when the switch stores energy, the recording starting condition is that the current starting threshold value of the energy storage loop is exceeded or the switch-on outlet is protected, 15s after starting, including 100ms before the threshold is out of limit, and the recording is finished;
step three: statistics of switch actuation time
When the switch is switched on and off and the energy storage action is carried out, the current starting time in the wave recording is recorded until the complete switching-on or switching-off of the switch is received, the electric loop module is switched on to remotely feed back the MCU, and the MCU calculates the actual switching-on and switching-off and energy storage action time of the switch;
step four: switch monitoring data acquisition analysis
When the voltage, the instantaneous maximum peak value and the average voltage of the current, the current and the energy storage action of the switching-on coil are divided by the direct current and alternating current amplitude monitoring module, the voltage, the instantaneous maximum peak value and the average voltage of the current and the current recording waveform of the energy storage coil are obtained, and the obtained data are analyzed by the MCU;
step five: switch life prediction
Through the analysis of the opening and closing wave recording data, the opening and closing action times of the switch are too many, the actual action time is longer and longer, the reliability of the opening and closing action becomes lower and exceeds a set time fixed value, and the early warning is sent out in advance by the switch mechanical life monitoring module.
Through the analysis of the energy storage wave recording data, the energy storage mechanism has more and longer time for completely storing energy due to more times of actions, so that the automatic functions of reclosing and local feeder are influenced, a set time fixed value is exceeded, and early warning is sent out in advance by the switch mechanical life monitoring module.
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Cited By (3)
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| CN113447807A (en) * | 2021-07-02 | 2021-09-28 | 东阳市联宜机电有限公司 | Microswitch service life detection device and detection method |
| CN113933691A (en) * | 2021-07-30 | 2022-01-14 | 东风商用车有限公司 | Switch endurance automatic testing and monitoring system based on MCU control |
| CN114019366A (en) * | 2021-11-05 | 2022-02-08 | 苏州迪芬德物联网科技有限公司 | Electrical component contact loss evaluation method |
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Application publication date: 20201218 |
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| RJ01 | Rejection of invention patent application after publication |