CN110779145A - Protection control method and system for air conditioner wiring and air conditioner - Google Patents

Protection control method and system for air conditioner wiring and air conditioner Download PDF

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Publication number
CN110779145A
CN110779145A CN201911091955.1A CN201911091955A CN110779145A CN 110779145 A CN110779145 A CN 110779145A CN 201911091955 A CN201911091955 A CN 201911091955A CN 110779145 A CN110779145 A CN 110779145A
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China
Prior art keywords
load
started
phase
zero line
air conditioner
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Pending
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CN201911091955.1A
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Chinese (zh)
Inventor
陈红
李发顺
许真鑫
黄绍敏
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Application filed by Aux Air Conditioning Co Ltd, Ningbo Aux Electric Co Ltd filed Critical Aux Air Conditioning Co Ltd
Priority to CN201911091955.1A priority Critical patent/CN110779145A/en
Publication of CN110779145A publication Critical patent/CN110779145A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00Details of emergency protective circuit arrangements
    • H02H1/0007Details of emergency protective circuit arrangements concerning the detecting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result

Abstract

A protection control method and a system for air conditioner wiring and an air conditioner are provided, wherein the protection control method comprises the following steps: in the process of wiring installation of the air conditioner, detecting the change of each phase voltage after the load is not started and the load is started in the three-phase voltage and the magnitude of each phase voltage value after the load is started; judging whether the zero line is connected after the load is started or not according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started; and turning off the load output in a case where it is determined that the neutral wire is not connected. Whether the zero line is connected or not is intelligently judged, and the load output is closed under the condition that the zero line is not connected, so that the intelligent protection of the circuit is realized, and the problem of component damage caused by the fact that the zero line is not connected to the circuit when an operator manually installs the zero line is avoided.

Description

Protection control method and system for air conditioner wiring and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a protection control method and system for air conditioner wiring and an air conditioner.
Background
The air conditioner uses three-phase power supply, and the wiring installation process of air conditioner is carried out manual installation by operating personnel, and everyone's operation habit is different, in some after-sales service, often has operating personnel not to connect the zero line at the in-process of installing the air conditioner.
Disclosure of Invention
The invention solves the problems that: the invention aims to provide a method for intelligently judging whether a zero line of an air conditioner is connected in a wiring process.
In order to solve the above problems, the present invention provides a method and a system for protecting and controlling an air conditioner wiring, and an air conditioner.
According to an aspect of the present invention, there is provided a protection control method of an air conditioner wiring, including: in the process of wiring installation of the air conditioner, detecting the change of each phase voltage after the load is not started and the load is started in the three-phase voltage and the magnitude of each phase voltage value after the load is started; judging whether the zero line is connected after the load is started or not according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started; and turning off the load output in a case where it is determined that the neutral wire is not connected.
The intelligent protection circuit has the advantages that in the wiring process of the air conditioner, the changes of the phase voltages of the three phases of the voltage without starting the load and the phase voltages of the three phases of the voltage after starting the load are detected, whether the zero line is in a connection state after starting the load is judged according to the degree of the changes of the phase voltages of the phases corresponding to the starting and non-starting of the load and the range of the values of the phase voltages of the phases after starting the load, whether the zero line is connected or not is judged intelligently, the output of the load is closed under the condition that the zero line is judged to be not connected, the intelligent protection of the circuit is realized, and the problem that the element devices are damaged due to the fact that the zero line is not connected to.
In an embodiment of the present invention, the step of determining whether the zero line is connected after the load is turned on according to the voltage change of each phase after the load is not turned on and the load is turned on and the magnitude of the voltage value of each phase after the load is turned on includes: and when the load is not started and the change of a certain phase voltage after the load is started is larger than the set threshold value of the phase and is maintained for a first preset time, and each phase voltage value is larger than the highest protection threshold value or smaller than the lowest protection threshold value and is maintained for a second preset time, judging that the zero line is not connected after the load is started.
The method comprises the steps of comparing the voltage change of each phase after the load is not started and the load is started with a set threshold, and simultaneously comparing the voltage value of each phase with a highest protection threshold and a lowest protection threshold, wherein the condition that the zero line is not connected possibly exists corresponding to the change amplitude of the phase voltage of a certain phase exceeding the set threshold of the phase, and whether each phase voltage is in a normal state needs to be detected.
In an embodiment of the invention, in the protection control method, the set threshold of each phase in three phases is 380V-420V. For example, the set threshold may be 400V.
In an embodiment of the present invention, in the protection control method, the highest protection threshold is 220V, and the lowest protection threshold is 50V to 100V.
According to another aspect of the present invention, there is provided a protection control system of an air conditioner wiring, including: the phase voltage detection module is used for detecting the change of each phase voltage of the three-phase voltage after the load is not started and the load is started and the magnitude of each phase voltage value after the load is started in the process of installing the wiring of the air conditioner; the judging module is used for judging whether the zero line is connected after the load is started according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started; and the control module is used for turning off the load output under the condition that the zero line is not connected.
In an embodiment of the present invention, the determining module includes a comparing unit, a determining unit and a timing unit, wherein the comparing unit is configured to compare the voltage change of each phase after the load is not turned on and the load is turned on with a set threshold of each phase, and compare the voltage value of each phase with a highest protection threshold and a lowest protection threshold, respectively; and the judging unit is used for judging whether the zero line is connected after the load is started according to the comparison result of the comparing unit.
In an embodiment of the present invention, the determining unit determines that the zero line is not connected after the load is turned on when the comparing unit compares that a change of a certain phase voltage between the load and the zero line after the load is turned on is greater than a set threshold of the phase and is maintained for a first preset time, and each phase voltage value is greater than a highest protection threshold or less than a lowest protection threshold and is maintained for a second preset time.
In an embodiment of the invention, in the protection control system, the set threshold of each of the three phases is 380V-420V. For example, the set threshold may be 400V.
In an embodiment of the present invention, in the protection control system, the highest protection threshold is 220V, and the lowest protection threshold is 50V to 100V.
According to still another aspect of the present invention, there is provided an air conditioner including any one of the protection control systems mentioned in the present invention or for performing the protection control method.
According to the protection control system and the air conditioner, in the wiring process of the air conditioner, the changes of the phase voltages of the three phases of the voltage without starting the load and after starting the load and the values of the phase voltages of the three phases after starting the load are detected, whether the zero line is in a connection state after starting the load is judged according to the degree of the changes of the phase voltages of the phases corresponding to the starting and non-starting of the load and the range of the values of the phase voltages after starting the load, whether the zero line is connected or not is intelligently judged, the output of the load is turned off under the condition that the zero line is not connected, the intelligent protection of a circuit is realized, and the problem that the element devices are damaged due to the fact that the zero line is not connected to the circuit when an operator manually installs the.
Drawings
Fig. 1 is a flowchart illustrating a method for protecting and controlling an air conditioner wiring according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-phase four-wire circuit for wiring of the air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram of a system for protecting and controlling the wiring of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
2-protection control system;
a 21-phase voltage detection module;
22-a judgment module;
221-a comparison unit; 222-a judging unit;
223-a timing unit;
23-control module.
Detailed Description
If the phase lines L1, L2, L3 and the zero line N in the three-phase power are not completely and correctly wired, the three-phase loads are different, the three-phase voltage is unbalanced, the voltage of the phase line connected with the heavier load is reduced, and the voltage of the phase line with the lighter load is increased rapidly, so that components of the controller can be damaged.
The invention provides a protection control method and system for air conditioner wiring and an air conditioner, which can intelligently judge whether a zero line of the air conditioner is connected in the wiring installation process by detecting phase voltage change before and after load starting and phase voltage value after load starting, and close load output under the condition of judging that the zero line is not connected, thereby realizing intelligent circuit protection and avoiding the problem of component damage caused by the fact that an operator does not connect the zero line to the circuit during manual installation.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.
First embodiment
In a first exemplary embodiment of the present invention, a method for protecting and controlling an air conditioner wiring is provided.
Fig. 1 is a flowchart illustrating a method for protecting and controlling an air conditioner wiring according to an embodiment of the present invention; fig. 2 is a schematic diagram of a three-phase four-wire circuit for wiring of an air conditioner according to an embodiment of the present invention.
Referring to fig. 1 and 2, the method for protecting and controlling the wiring of the air conditioner of the present invention includes:
step S11: in the process of wiring installation of the air conditioner, detecting the change of each phase voltage after the load is not started and the load is started in the three-phase voltage and the magnitude of each phase voltage value after the load is started;
in this embodiment, as shown in fig. 2, the terminals are indicated by circles in fig. 2, the three-phase four wires are respectively a first phase line L1, a second phase line L2, a third phase line L3 and a zero line N located on the right side, and the terminals located on the left side indicate phase line interfaces corresponding to the live line and zero line terminals of the air conditioner. The structure of each phase line is the same, the unified symbol C is used for representing the capacitors connected with each phase line, the capacitance values of different phase lines can be equal or unequal, the setting can be carried out according to actual requirements, a piezoresistor ZNR and a load are connected in parallel at two ends of the capacitor C, the load is indicated by a resistor R, and the piezoresistor ZNR is used for overvoltage protection. The phase voltages between the first phase line L1, the second phase line L2, the third phase line L3 and the zero line N corresponding to the load opening are respectively U L1、U L2、U L3And (4) showing.
In the wiring installation process of the air conditioner, each phase voltage in the three-phase voltage can change after the load is not started and the load is started, if each phase line L1, L2, L3 and the zero line N in the three-phase voltage are not completely and correctly wired, the three-phase load is different, the three-phase voltage is unbalanced, the voltage of the phase line connected with the heavier load is reduced, and the voltage of the phase line with the lighter load is increased rapidly. Based on the three-phase voltage, the change of each phase voltage after the load is not started and the load is started and the magnitude of each phase voltage value after the load is started are detected.
In this embodiment, each phase voltage is detected in real time when the load is not turned on, and each phase voltage of the three-phase voltages when the load is not turned on is represented as: u shape L1-Free、U L2-Free、UL 13-Free;
After the load is started, each phase voltage is detected in real time, and after the detected load is started, each phase voltage in the three-phase voltages is respectively expressed as: u shape L1、U L2、U L3(ii) a Namely, the detected values of the phase voltage values after the load is turned on are respectively as follows: u shape L1、U L2、U L3
The voltage of each phase after the load is not started and the load is started is changed as follows: i U L1-U L1-Free|、|U L2-U L2-Free|、|U L3-U L3-Free|。
Step S12: judging whether the zero line is connected after the load is started or not according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started;
in an embodiment, the step S12 of determining whether the zero line is connected after the load is turned on according to the voltage change of each phase after the load is not turned on and the load is turned on and the magnitude of the voltage value of each phase after the load is turned on includes: and when the load is not started and the change of a certain phase voltage after the load is started is larger than the set threshold value of the phase and is maintained for a first preset time, and each phase voltage value is larger than the highest protection threshold value or smaller than the lowest protection threshold value and is maintained for a second preset time, judging that the zero line is not connected after the load is started.
For example, in this embodiment, when the following condition one, condition two, condition three, and condition four are all satisfied, it is determined that the zero line is not connected after the load is turned on:
the first condition is as follows:
|U L1-U L1-Free | > U1_ threshold, and maintained at T1_ ms (milliseconds); (1) alternatively, the first and second electrodes may be,
|U L2-U L2-Free | > U2_ threshold, and maintained at T2_ ms (milliseconds); (2) alternatively, the first and second electrodes may be,
|U L3-U L3-Free | > U3_ threshold, and maintained at T3_ ms (milliseconds); (3)
any one of the above equations (1) to (3) is satisfied, and the condition one is satisfied;
the set thresholds U1_ threshold, U2_ threshold, and U3_ threshold of each phase may be obtained according to actual experimental tests, and the three may be equal in size or unequal in size. The time of maintenance T1_ ms, T2_ ms, T3_ ms may be several electrical cycles, e.g. 50ms, 100ms or 150ms, 200ms, etc.
And a second condition:
U L1is greater than U1_ Higshreshold, and maintains T1_ Hig _ ms; (4) alternatively, the first and second electrodes may be,
U L1< U1_ Lowshreshold, and maintain T1_ Low _ ms; (5)
one of the above equations (4) or (5) is satisfied, and the condition two is satisfied;
the highest protection threshold U1_ highthreshold of the phase voltage of the first phase line L1 is 220V. The minimum protection threshold U1_ Lowshreshold of the phase voltage of the first phase line L1 is 50V-100V. The maintained times T1_ Hig _ ms, T1_ Low _ ms may be several electrical cycles, e.g. 50ms, 100ms or 150ms, 200ms, etc.
And (3) carrying out a third condition:
U L2is greater than U2_ Higshreshold, and maintains T2_ Hig _ ms; (6) alternatively, the first and second electrodes may be,
U L2< U2_ Lowshreshold, and maintain T2_ Low _ ms; (7)
one of the above equations (6) or (7) is satisfied, and it is considered that the condition three is satisfied;
wherein the maximum protection threshold U2_ highthreshold of the phase voltage of the second phase line L2 is 220V. The minimum protection threshold U2_ Lowshreshold of the phase voltage of the second phase line L2 is 50V-100V. The maintained times T2_ Hig _ ms, T2_ Low _ ms may be several electrical cycles, e.g. 50ms, 100ms or 150ms, 200ms, etc.
And a fourth condition:
U L3is greater than U3_ Higshreshold, and maintains T3_ Hig _ ms; (8) alternatively, the first and second electrodes may be,
U L3< U3_ Lowshreshold, and maintain T3_ Low _ ms; (9)
one of the above equations (8) or (9) is satisfied, and it is considered that the condition four is satisfied;
the highest protection threshold U3_ Higshreshold of the phase voltage L3 of the third phase line is 220V. The minimum protection threshold U3_ Lowshreshold of the phase voltage of the third phase line L3 is 50V-100V. The maintained times T3_ Hig _ ms, T3_ Low _ ms may be several electrical cycles, e.g. 50ms, 100ms or 150ms, 200ms, etc.
The method comprises the steps of comparing the voltage change of each phase after the load is not started and the load is started with a set threshold, and simultaneously comparing the voltage value of each phase with a highest protection threshold and a lowest protection threshold, wherein the condition that the zero line is not connected possibly exists corresponding to the change amplitude of the phase voltage of a certain phase exceeding the set threshold of the phase, and whether each phase voltage is in a normal state needs to be detected.
In addition, the determination after the determination result lasts for a period of time is beneficial to avoiding the problem of determination errors caused by data fluctuation or other temporary conditions, so that the determination results of the voltage change and the voltage value are accurate.
Step S13: closing the load output when the zero line is judged not to be connected;
in the case where it has been determined in step S12 whether the zero line is connected after the load is turned on, there is a risk that the component is damaged in response to the case where the zero line is not connected, and the load output is to be turned off.
In the embodiment, phase voltages of three phases L1, L2 and L3 are monitored in real time, if the N phases are not connected, the rear end of the circuit is coupled with a suspended N line, and when a rear-stage load is not started and is in a light load, the voltages of the circuits L1, L2 and L3 are in a balanced state; however, if the rear-stage load is started, the three-phase line is unbalanced; through accurate judgement, when the phase voltage is too low or rises to reach the protection threshold, the load output is closed, the electric stress damage of the controller components is reduced, and the damage of the components is reduced.
In summary, in the protection control method of this embodiment, in the air conditioner wiring process, the changes of the phase voltages of the three phases of voltages after the load is not turned on and the load is turned on and the magnitudes of the phase voltage values of the three phases of voltages after the load is turned on are detected, whether the zero line is in the connection state after the load is turned on is judged according to the degree of the changes of the phase voltages of the phases corresponding to the turn-on and the range of the magnitudes of the phase voltage values of the phases corresponding to the turn-on and the turn-off of the load, whether the zero line is connected is intelligently judged, and the load output is turned off when the zero line is judged to be unconnected, so that the intelligent protection of the circuit is realized, and the problem of component damage caused by the fact that the zero line is.
Second embodiment
In a second exemplary embodiment of the present disclosure, a protection control system of an air conditioner wiring is provided, and the protection control system of the present embodiment is used to execute the protection control method shown in the first embodiment.
Fig. 3 is a block diagram of a system for protecting and controlling the wiring of an air conditioner according to an embodiment of the present invention.
Referring to fig. 3, in this embodiment, the protection control system 2 includes: the phase voltage detection module 21 is used for detecting the change of each phase voltage of the three-phase voltage after the load is not started and the load is started and the magnitude of each phase voltage value after the load is started in the process of installing the wiring of the air conditioner; the judging module 22 is used for judging whether the zero line is connected after the load is started according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started; and a control module 23 for turning off the load output in case it is determined that the neutral wire is not connected.
In an embodiment of the present invention, the determining module 22 includes a comparing unit 221, a determining unit 222, and a timing unit 223, where the comparing unit 221 is configured to compare the voltage change of each phase after the load is not turned on and the load is turned on with a set threshold of each phase, and compare the voltage value of each phase with a highest protection threshold and a lowest protection threshold, respectively; the judging unit 222 is configured to judge whether the zero line is connected after the load is turned on according to the comparison result of the comparing unit; the timing unit 223 is used for timing the maintaining time of the comparison result.
In an embodiment of the present invention, the determining unit 222 determines that the zero line is not connected after the load is turned on when the comparing unit 221 compares that a change of a certain phase voltage after the load is not turned on and the load is turned on is greater than a set threshold of the phase for a first preset time, and each phase voltage value is greater than a highest protection threshold or less than a lowest protection threshold for a second preset time.
In an embodiment of the invention, in the protection control system, the set threshold of each of the three phases is 380V-420V. For example, the set threshold may be 400V.
In an embodiment of the present invention, in the protection control system, the highest protection threshold is 220V, and the lowest protection threshold is 50V to 100V.
The control system of the embodiment detects the change of each phase voltage of the load which is not started and the load which is started in the three-phase voltage and the magnitude of each phase voltage value of the load which is started in the wiring process of the air conditioner, judges whether the zero line is in a connection state after the load is started according to the degree of the change of each phase voltage of the load which is started and not started and the range of the magnitude of each phase voltage value of the load which is started, intelligently judges whether the zero line is connected or not, and closes the load output under the condition that the zero line is judged to be not connected, thereby realizing the intelligent protection of the circuit and avoiding the problem that the element damage is caused to the circuit by the non-connected zero line when an operator manually installs the air conditioner.
Third embodiment
In a third exemplary embodiment of the present invention, there is provided an air conditioner including any one of the protection control systems mentioned in the present invention or for performing the protection control method.
In the wiring installation process of the air conditioner, the state of whether the zero line is connected or not is intelligently judged according to the change of each phase voltage before and after the load is started and the range of the phase voltage value, the load output is closed when the zero line is judged to be unconnected so as to realize the intelligent protection of a circuit, and the damage of the unconnected zero line to components can be avoided.
In summary, the invention provides a protection control method, a system and an air conditioner for air conditioner wiring, wherein in the air conditioner wiring process, the changes of each phase voltage of three-phase voltages after the load is not started and the load is started and the magnitude of each phase voltage value after the load is started are detected, whether the zero line is in a connection state after the load is started is judged according to the degree of the changes of the phase voltages of the phases corresponding to the load is started and not started (namely the unbalanced degree of the phase voltages of the three phases before and after the load is started) and the range of the magnitude of each phase voltage value after the load is started, whether the zero line is connected or not is intelligently judged, and the load output is closed under the condition that the zero line is not connected, so that the intelligent protection of a circuit is realized, and the problem of component damage caused by the fact that the zero line is not connected to the circuit when an operator manually installs the air.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A protection control method for air conditioner wiring is characterized by comprising the following steps: in the process of wiring installation of the air conditioner, detecting the change of each phase voltage after the load is not started and the load is started in the three-phase voltage and the magnitude of each phase voltage value after the load is started; judging whether the zero line is connected after the load is started or not according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started; and turning off the load output in a case where it is determined that the neutral wire is not connected.
2. The protection control method according to claim 1, wherein the step of judging whether the zero line is connected after the load is turned on according to the voltage change of each phase after the load is not turned on and the load is turned on and the magnitude of the voltage value of each phase after the load is turned on comprises the steps of: and when the load is not started and the change of a certain phase voltage after the load is started is larger than the set threshold value of the phase and is maintained for a first preset time, and each phase voltage value is larger than the highest protection threshold value or smaller than the lowest protection threshold value and is maintained for a second preset time, judging that the zero line is not connected after the load is started.
3. The protection control method according to claim 1, wherein the set threshold value of each of the three phases is 380V to 420V.
4. The protection control method according to claim 1, wherein the highest protection threshold is 220V and the lowest protection threshold is 50V-100V.
5. A protection control system of air conditioner wiring is characterized by comprising: the phase voltage detection module is used for detecting the change of each phase voltage of the three-phase voltage after the load is not started and the load is started and the magnitude of each phase voltage value after the load is started in the process of installing the wiring of the air conditioner; the judging module is used for judging whether the zero line is connected after the load is started according to the voltage change of each phase after the load is not started and the load is started and the voltage value of each phase after the load is started; and the control module is used for turning off the load output under the condition that the zero line is not connected.
6. The protection control system according to claim 5, wherein the judging module comprises a comparing unit, a judging unit and a timing unit, wherein the comparing unit is used for comparing the voltage change of each phase after the load is not started and the load is started with the set threshold value of each phase, and comparing the voltage value of each phase with the highest protection threshold value and the lowest protection threshold value respectively; and the judging unit is used for judging whether the zero line is connected after the load is started according to the comparison result of the comparing unit.
7. The protection control system according to claim 6, wherein the judging unit judges that the zero line is not connected after the load is turned on, in a case where the comparing unit compares that a change of a certain phase voltage after the load is not turned on and the load is turned on is larger than a set threshold value of the phase for a first preset time, and each phase voltage value is larger than a highest protection threshold value or smaller than a lowest protection threshold value for a second preset time.
8. The protection control system according to claim 5, wherein the set threshold value of each of the three phases is 380V-420V.
9. The protection control system according to claim 5, characterized in that the highest protection threshold is 220V and the lowest protection threshold is 50V-100V.
10. An air conditioner characterized by comprising the protection control system of any one of claims 5 to 9 or for executing the protection control method of any one of claims 1 to 4.
CN201911091955.1A 2019-11-08 2019-11-08 Protection control method and system for air conditioner wiring and air conditioner Pending CN110779145A (en)

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