CN115986674B - Civil aircraft windshield heating three-section type current protection system and protection method - Google Patents
Civil aircraft windshield heating three-section type current protection system and protection method Download PDFInfo
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- CN115986674B CN115986674B CN202211724079.3A CN202211724079A CN115986674B CN 115986674 B CN115986674 B CN 115986674B CN 202211724079 A CN202211724079 A CN 202211724079A CN 115986674 B CN115986674 B CN 115986674B
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Abstract
The invention discloses a civil aircraft windshield heating three-section type current protection system and a protection method, and relates to the technical field of windshield electric heating. The invention comprises a windshield heating three-phase power module, a voltage and current measuring module, a load resistance module, a heating resistance module, a fault arc module, a breaker module and a three-section current protection subsystem; the three-section type current protection subsystem judges the effective value and the setting value according to the measured three-phase current, then generates a 0/1 signal, and controls the breaker module to be disconnected when the 0 signal is generated, and the windshield heating system stops running; when a signal 1 is generated, the circuit breaker module is controlled to be closed, and the windshield heating system operates normally. The invention can solve the problem that the wind shield weak arc is difficult to be found by crews in the process of the civil aircraft and the line fault elimination, then the influence of the arc on the circuit operation is found in the current protection system, the circuit operation is disconnected in time, and the operation safety of the civil aircraft is effectively protected.
Description
Technical Field
The invention belongs to the technical field of windshield electric heating, and particularly relates to a civil aircraft windshield heating three-section type current protection system and a protection method.
Background
The civil aviation windshield glass is a significant factor related to safety problems, and in the high-altitude flight of an airplane, the safety guarantee of pilots, passenger service sets and passengers is crucial, so that the stable work of cockpit software and hardware electronic equipment and the reliable quality of non-electronic equipment are ensured. When the windshield breaks, the cabin begins to lose pressure and the pilot has difficulty maneuvering the aircraft. Aircraft windshield breakage directly affects flight safety, and arcing is the root cause of windshield breakage in a Chuan 8633 forced landing accident.
The windshield is composed of an outer layer, an intermediate layer and an inner layer of three layers of glass, the layers are mutually filled and bonded by polyurethane interlayer, PVB and polyurethane, and the bus bar and the conductive film are arranged under the outer layer of glass to heat and prevent ice of the windshield. Because the windshield is not tightly sealed, water vapor enters the inside to soak aged wires, weak electric arcs can be generated when the wires are damaged after long-time accumulation, the electric arcs have small current fluctuation in a circuit, and the traditional aircraft windshield heating system cannot detect the electric arcs. Under the influence of arc heat, the windshield is heated unevenly and is easy to deform in different directions, so that the windshield is broken.
Conventional windshields employ a windshield warming control assembly (WHCU) to monitor and control the operation of the warming circuit, the overheat protection current of which is activated under two conditions: first, when the windshield temperature exceeds 145F; and secondly, when current flows through a heating circuit of the windshield. In the traditional windshield mode, the electric arc has small influence on the circuit, the current fluctuation is small, and WUCH and crew are not easy to detect.
Disclosure of Invention
The invention aims to provide a three-section type current protection system and a three-section type current protection method for heating a civil aircraft windshield, which can effectively solve the problem that the windshield is difficult to detect due to a humid environment.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a civil aircraft windshield heating three-section type current protection system, which comprises a heating system and a protection system, wherein the heating system comprises a windshield heating Wen Sanxiang power module, a voltage and current measurement module, a load resistance module, a heating resistance module, a fault arc module and a circuit breaker module; the protection system comprises three current protection subsystems, namely an I-section current protection subsystem, an II-section current protection subsystem and an III-section current protection subsystem, wherein each current protection subsystem comprises a signal input module, an effective value solving module, a maximum value solving module, a setting value setting module, an SR trigger signal judging module and a signal output module, and the signal input module, the effective value solving module, the maximum value solving module, the setting value setting module, the SR trigger signal judging module and the signal output module are sequentially connected in series; the heating system provides circuit operation data of a civil aircraft windshield heating system, and after the three-section protection system module is additionally arranged, diagnosis can be carried out after an electric arc appears, and the circuit operation can be disconnected, so that the safety of the heating circuit is effectively ensured.
The rear end of the windshield heating three-phase power supply module is connected with a voltage and current measuring module, the rear end of the voltage and current measuring module is connected with a load resistance module, the rear end of the load resistance module is sequentially connected with a voltage and current measuring module and a fault arc module, the voltage and current measuring module between the heating resistance module and the windshield heating three-phase power supply module and the load resistance module is connected onto the windshield heating three-phase power supply module in parallel, and the rear end of the heating resistance module is connected with another fault arc module.
As a preferable technical scheme of the invention, the windshield heating three-phase power module and the fault arc module are both grounded by 115V.
As a preferable technical scheme of the invention, the windshield heating Wen Sanxiang power module is used for simulating a windshield heating system power module and generating three-phase current and voltage for circuit operation.
As a preferable technical scheme of the invention, the voltage and current measuring module is used for simulating the measurement of voltage and current in the windshield heating circuit, and the voltage and current measuring module is used as a measuring tool of the voltage and the current.
As a preferable technical scheme of the invention, the heating resistor module is used for simulating a resistor for heating glass in a windshield heating system in a windshield structure; the load resistor module is used in the simulated windshield heating circuit to replace the resistor of the elements such as relevant temperature control, heating sensor and the like.
As an optimal technical scheme, the fault arc module is used for simulating an arc phenomenon in a humid environment and generating a fault arc signal to influence the operation of a circuit system.
As a preferable technical scheme of the invention, the circuit breaker module is used for controlling the operation of the heating system, when the circuit breaker module is disconnected, the heating system stops operating, and when the circuit breaker module is closed, the heating system normally operates; the opening and closing of the breaker module are controlled through a 0/1 signal after the current measurement and conversion of the current protection subsystem, the 0 signal is used for controlling the tripping of the breaker module, and the 1 signal is used for controlling the closing of the breaker module.
As a preferable technical scheme of the invention, the I-section current protection subsystem is a current quick-break protection system, the II-section current protection subsystem is a time-limited current quick-break protection system, the III-section current protection subsystem is a time-limited overcurrent protection system, and the control of a breaker module on a circuit is realized by diagnosing three-phase power supply current in the circuit.
As a preferred technical scheme of the invention, the three current protection subsystems are in protection means in different ranges, the protection range of the I-section current protection subsystem is 80-85% of the whole length of the circuit, the protection range of the II-section current protection subsystem is the whole length of the circuit, and the protection range of the III-section current protection subsystem is the whole length of the circuit and extends to the next section of the adjacent circuit.
The invention has the following beneficial effects:
the invention can solve the problem that the wind shield weak arc is difficult to be found by crews in the process of the civil aircraft and the line fault elimination, then the influence of the arc on the circuit operation is found in the current protection system, the circuit operation is disconnected in time, and the operation safety of the civil aircraft is effectively protected.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a windshield heating system of a civil aircraft windshield heating three-stage current protection system.
Fig. 2 is a diagram of a windshield heating three-stage current protection system of a civil aircraft windshield heating three-stage current protection system.
Fig. 3 is a diagram of a windshield heating section I current protection subsystem of a civil aircraft windshield heating three-section current protection system.
Fig. 4 is a diagram of a windshield heating stage II current protection subsystem of a civil aircraft windshield heating three-stage current protection system.
Fig. 5 is a view of a windshield heating section III current protection subsystem of a civil aircraft windshield heating three-section current protection system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-5, the invention discloses a three-section type current protection system for windshield heating of civil aircraft, which comprises a heating system and a protection system, wherein the heating system comprises a windshield heating Wen Sanxiang power module, a voltage and current measuring module, a load resistance module, a heating resistance module, a fault arc module and a circuit breaker module, and the windshield heating three-phase power module and the fault arc module are grounded by 115V; the protection system comprises three current protection subsystems, namely an I-section current protection subsystem, an II-section current protection subsystem and a III-section current protection subsystem; the heating system provides circuit operation data of a civil aircraft windshield heating system, and after the three-section protection system module is additionally arranged, diagnosis can be carried out after an electric arc appears, and the circuit operation can be disconnected, so that the safety of the heating circuit is effectively ensured.
Each protection subsystem sequentially comprises a signal input module, an effective value solving module, a maximum value solving module, a setting value setting module, an SR trigger signal judging module and a signal output module. The operation flow of the three protection subsystems is similar, only the individual modules in each protection subsystem are different in specific setting value, each protection subsystem respectively measures three-phase current to obtain corresponding values, the three measured current signals are obtained according to the set frequency in the effective value solving module, the three effective values are selected in the maximum value solving module, the three effective values are compared with the setting value setting module, the setting value setting module is used for generating a 1 signal when the value of the maximum value module is larger than the setting value after being compared with the setting value module according to the related values of the protection ranges of the protection subsystems, the signal is smaller than the setting value to generate a 0 signal, the signal is judged by the SR trigger, and the 1 signal or the 0 signal is generated again according to the relation of logic gates.
The rear end of the windshield heating three-phase power supply module is connected with a voltage and current measuring module, the rear end of the voltage and current measuring module is connected with a load resistance module, the rear end of the load resistance module is sequentially connected with a voltage and current measuring module and a fault arc module, the voltage and current measuring module between the heating resistance module and the windshield heating three-phase power supply module and the load resistance module is connected onto the windshield heating Wen Sanxiang power supply module in parallel, and the rear end of the heating resistance module is connected with another fault arc module.
Preferably, the windshield heating Wen Sanxiang power module is used for simulating a windshield heating system power module and generating three-phase current and voltage for circuit operation; the voltage and current measurement module is used for simulating the measurement of voltage and current in the windshield heating circuit.
Preferably, the heating resistor module is used in a simulated windshield heating system to heat the glass in the windshield structure; the load resistor module is used for simulating a temperature control element in the windshield heating circuit; the fault arc module is used for simulating an arc phenomenon in a humid environment and generating a fault arc signal to influence the operation of the circuit system.
Preferably, the circuit breaker module is used for controlling the operation of the heating system, when the circuit breaker module is opened, the heating system stops operating, and when the circuit breaker module is closed, the heating system operates normally; the opening and closing of the breaker module is controlled through a 0/1 signal after the current measurement and conversion of the current protection subsystem, the 0 signal is used for controlling the tripping of the breaker module, and the 1 signal is used for controlling the closing of the breaker module.
Preferably, the I-section current protection subsystem is a current quick-break protection system, the II-section current protection subsystem is a time-limited current quick-break protection system, and the III-section current protection subsystem is a time-limited overcurrent protection system.
Preferably, the three current protection subsystems are protection means in different ranges, the protection range of the I-section current protection subsystem is 80-85% of the protection range of the circuit, the protection range of the II-section current protection subsystem is the whole length of the circuit, and the protection range of the III-section current protection subsystem is the whole length of the circuit and extends to the next section of the adjacent circuit.
Example two
A protection method of a civil aircraft windshield heating three-section type current protection system comprises the following steps:
step one, setting values of all current protection subsystems are needed, wherein the protection ranges in the three-section type protection subsystems are different. The protection range of the I-section current protection subsystem is 80-85% of the whole length of the circuit, the protection range of the II-section current protection subsystem is the whole length of the circuit, the protection range of the III-section current protection subsystem is the whole length of the circuit and extends to the next section of the adjacent circuit, and the protection ranges of all the sections are different, so that the setting values in all the sections of the protection systems are different.
In the related handbook, the resistance value of the heating resistor module is 35.1-38.8 ohms, and here, the resistance value is taken to be 37 ohms. The setting values of the three-section type overcurrent protection sections are generally as follows: setting values of the I-section current protection subsystem take 8-10 times of rated current, setting values of the II-section current protection subsystem are smaller than setting values of the I-section current protection subsystem, and can take 7-9 times of rated current, and setting values of the III-section current protection subsystem take 1-1.2 times of rated current. In the subsystem, the rated current is calculated to be 3.1A by a three-phase power supply of 115V.
And step two, setting the protection time of each current protection subsystem, namely, the protection time is different in the three-section type current protection subsystems, and the protection time is longer than that of the section I current protection subsystem in the section II current protection subsystem and the section III current protection subsystem, and one section is coincident. If a fault occurs in the protection time range of the I-section current protection subsystem, the I-section current protection subsystem acts earlier than the II-section current protection subsystem and the III-section current protection subsystem, so that action delay is added on the premise of the II-section current protection subsystem and the III-section current protection subsystem.
And thirdly, judging the measured three-phase current by using an RMS (effective value obtaining module) in the current protection system. After three-phase current is measured, the three-stage subsystem protection module obtains an effective value through RMS, then three current effective values in three phases select a maximum value, the maximum value is compared with a setting value set by the three current effective values, if the maximum value is larger than the setting value, a signal is generated, the maximum value is changed from zero to one, and if the maximum value is smaller than the setting value, the signal is outputted by zero.
Step four, the compared 0/1 signal in the current protection system is judged again through an SR trigger: the 0/1 signal obtained after the comparison is passed through an SR trigger (a basic unit circuit which is formed by logic gates and can store, judge and output corresponding relation signals), the signal is judged again through the SR trigger, a trip signal which is equal to 0 or equal to 1 is generated, if the trip signal which is equal to 0 is generated (a breaker module is controlled by 0/1, the breaker module is controlled to trip, and the breaker module is controlled to be closed by 1), the breaker module is controlled to trip so as to open a circuit system, and if the trip signal which is equal to 1 is generated, the breaker module is controlled to be closed so as to enable the circuit system to normally operate.
AND fifthly, integrating signals output by the three current protection subsystems through an AND module (a logic operation module with integrated value AND signal function), generating a 0 signal as long as one 0 signal appears in the three signals, AND then enabling the breaker module to trip AND open.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (7)
1. The utility model provides a civil aircraft windscreen heats syllogic current protection system which characterized in that, syllogic current protection system includes:
the heating system comprises a windshield heating Wen Sanxiang power module, a voltage and current measuring module, a load resistance module, a heating resistance module, a fault arc module and a circuit breaker module; and
the protection system comprises three current protection subsystems, namely an I-section current protection subsystem, an II-section current protection subsystem and an III-section current protection subsystem, wherein each current protection subsystem comprises a signal input module, a valid value solving module, a maximum value solving module, a setting value setting module, an SR trigger signal judging module and a signal output module, and the signal input module, the valid value solving module, the maximum value solving module, the setting value setting module, the SR trigger signal judging module and the signal output module are sequentially connected in series;
the rear end of the windshield heating three-phase power supply module is connected with a voltage and current measuring module, the rear end of the voltage and current measuring module is connected with a load resistance module, the rear end of the load resistance module is sequentially connected with a voltage and current measuring module and a fault arc module, the voltage and current measuring module between the heating resistance module and the windshield heating three-phase power supply module and the load resistance module is connected onto the windshield heating three-phase power supply module in parallel, and the rear end of the heating resistance module is connected with another fault arc module;
the I-section current protection subsystem is a current quick-break protection system, the II-section current protection subsystem is a time-limited current quick-break protection system, and the III-section current protection subsystem is a time-limited overcurrent protection system;
the three current protection subsystems are in protection means in different ranges, the protection range of the I-section current protection subsystem is 80-85% of the whole length of the circuit, the protection range of the II-section current protection subsystem is the whole length of the circuit, and the protection range of the III-section current protection subsystem is the whole length of the circuit and extends to the next section of the adjacent circuit;
the protection method of the civil aircraft windshield heating three-section type current protection system comprises the following steps:
setting a setting value of each current protection subsystem, wherein the setting value of the I-section current protection subsystem takes 8-10 times of rated current, the setting value of the II-section current protection subsystem takes 7-9 times of rated current, and the setting value of the III-section current protection subsystem takes 1-1.2 times of rated current;
setting protection time of each current protection subsystem, wherein the protection time of the II-section current protection subsystem and the III-section current protection subsystem is longer than that of the I-section current protection subsystem;
thirdly, after three-phase currents are measured, the three current protection subsystems calculate effective values through RMS, the maximum value of the three current effective values in the three-phase currents is compared with a set setting value, if the maximum value is larger than the setting value, a signal from 0 to 1 is generated, and if the maximum value is smaller than the setting value, a 0 signal is output;
step four, the 0/1 signal obtained after the comparison passes through an SR trigger, the signal is re-judged through the SR trigger, a trip signal which is equal to 0 or equal to 1 is generated, the circuit breaker module is controlled to be opened if the trip signal which is equal to 0 is generated, and the circuit breaker module is controlled to be closed if the trip signal which is equal to 1 is generated;
AND fifthly, integrating signals output by the three current protection subsystems through an AND module, AND if one 0 signal appears in the three signals, generating one 0 signal to enable the breaker module to trip AND break.
2. The civil aircraft windshield heating three-stage current protection system according to claim 1, wherein the windshield heating three-phase power module and the fault arc module are both grounded at 115V.
3. The civil aircraft windshield heating three-stage current protection system according to claim 1, wherein the windshield heating Wen Sanxiang power module is used for simulating a windshield heating system power module to generate three-phase current and voltage for circuit operation.
4. The civil aircraft windshield heating three-stage current protection system according to claim 1, wherein the voltage and current measurement module is used for simulating measurement of voltage and current in a windshield heating circuit.
5. The civil aircraft windshield heating three-stage current protection system according to claim 1, wherein the heating resistor module is used for simulating a resistor for heating glass in a windshield structure in the windshield heating system; the load resistor module is used for simulating a temperature control element in the windshield heating circuit.
6. The civil aircraft windshield heating three-stage current protection system according to claim 1, wherein the fault arc module is used for simulating an arc phenomenon in a humid environment, and generating a fault arc signal to influence the operation of a circuit system.
7. The civil aircraft windshield heating three-stage current protection system according to claim 1, wherein the circuit breaker module is used for controlling the operation of the heating system, the heating system stops operating when the circuit breaker module is opened, and the heating system operates normally when the circuit breaker module is closed;
the opening and closing of the breaker module are controlled through a 0/1 signal after the current measurement and conversion of the current protection subsystem, the 0 signal is used for controlling the tripping of the breaker module, and the 1 signal is used for controlling the closing of the breaker module.
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| US7282924B1 (en) * | 2006-06-29 | 2007-10-16 | Target Hi-Tech Electronics Ltd. | Computerized electricity system having an arc fault detecting sub-system |
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| CN115986674A (en) | 2023-04-18 |
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