CN112595903B - Single-phase ammeter phase judgment method, device and meter reading system - Google Patents
Single-phase ammeter phase judgment method, device and meter reading system Download PDFInfo
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- CN112595903B CN112595903B CN202011294404.8A CN202011294404A CN112595903B CN 112595903 B CN112595903 B CN 112595903B CN 202011294404 A CN202011294404 A CN 202011294404A CN 112595903 B CN112595903 B CN 112595903B
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- G01—MEASURING; TESTING
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- G—PHYSICS
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Abstract
The invention discloses a single-phase ammeter phase judging method, a single-phase ammeter phase judging device and a meter reading system. The single-phase ammeter phase judging method comprises the following steps: and controlling the wiring terminal connected with the alternating current power grid to be grounded according to the phase judgment instruction, acquiring the A-phase test voltage of the A-phase line, the B-phase test voltage of the B-phase line and the C-phase test voltage of the C-phase line, controlling the wiring terminal to be disconnected from the ground according to the phase judgment ending instruction, and determining the phase of the single-phase electric meter according to the A-phase test voltage, the B-phase test voltage, the C-phase test voltage and the test voltage threshold value. By utilizing the single-phase ammeter phase judging method provided by the invention, the single-phase ammeter can determine the phase of the phase line connected to the single-phase ammeter, and the analysis of the power utilization load of each phase line of the alternating-current power grid by combining the power utilization information collected by the single-phase ammeter is facilitated based on the phase information of the single-phase ammeter, so that the judgment and adjustment of the three-phase unbalance degree of the alternating-current power grid are facilitated.
Description
Technical Field
The embodiment of the invention relates to an alternating current power grid technology, in particular to a single-phase meter phase judging method, a single-phase meter phase judging device and a meter reading system.
Background
With the rapid development of the economy in China, the electric demand of various industries is larger and larger, and the phenomenon of unbalanced electricity consumption at different times is also serious. In order to relieve the increasingly sharp contradiction between power supply and demand in China, adjust a load curve and improve the phenomenon of unbalanced power consumption, accurate statistics is required for the power consumption of users.
Because of popularization of the intelligent power grid, the current low-voltage meter basically realizes comprehensive meter reading, and meter reading personnel can pay off the day of meter reading by crossing a street every month, so that a large amount of manpower and material resources are saved, but the current meter reading technology and system can not judge the connected phase of the low-voltage single-phase meter temporarily, and difficulty is brought to later electricity load analysis and three-phase imbalance adjustment.
Disclosure of Invention
The invention provides a single-phase electric meter phase judging method, a single-phase electric meter phase judging device and a meter reading system, so as to achieve the purpose of effectively identifying the single-phase electric meter phase.
In a first aspect, an embodiment of the present invention provides a single-phase electric meter phase judging method, including:
the wiring terminal connected with the alternating current network of the single-phase ammeter is controlled to be grounded according to the phase judgment instruction,
acquiring A-phase test voltage of an A-phase line, B-phase test voltage of a B-phase line and C-phase test voltage of a C-phase line of an alternating current power grid,
the terminal is controlled to be disconnected from the ground according to the end judging instruction,
and determining the phase of the single-phase ammeter according to the A-phase test voltage, the B-phase test voltage, the C-phase test voltage and a test voltage threshold.
Further, the method also comprises judging whether the grounding time of the terminal reaches the measured time,
and if the grounding time length reaches the measurement time length, acquiring the A-phase test voltage, the B-phase test voltage and the C-phase test voltage, and controlling the terminal to be disconnected from the ground according to the phase judgment ending instruction.
Further, the method further comprises the following steps:
acquiring an A-phase initial voltage of an A-phase line, a B-phase initial voltage of a B-phase line and a C-phase initial voltage of a C-phase line of an alternating current power grid,
determining a phase A voltage variation according to the phase A initial voltage and the phase A test voltage, determining a phase B voltage variation according to the phase B initial voltage and the phase B test voltage, determining a phase C voltage variation according to the phase C initial voltage and the phase C test voltage,
and determining the phase of the single-phase ammeter according to the phase A voltage variation, the phase B voltage variation, the phase C voltage variation, the phase voltage variation threshold, the phase A test voltage, the phase B test voltage, the phase C test voltage and the test voltage threshold.
In a second aspect, the embodiment of the invention also provides a single-phase electric meter phase judging device, which comprises a voltage detecting unit, a control unit, a phase detecting unit and a communication unit,
the control unit is respectively connected with the same detection unit and the communication unit, the voltage detection unit is in communication connection with the control unit through the communication unit,
the voltage detection unit is used for collecting and sending the A-phase test voltage of the A-phase line, the B-phase test voltage of the B-phase line and the C-phase test voltage of the C-phase line to the communication unit,
the control unit is used for responding to a phase judgment instruction, controlling the phase detection unit to connect the wiring terminal of the single-phase ammeter with the alternating current network to the ground, responding to the phase judgment ending instruction, controlling the phase detection unit to disconnect the wiring terminal from the ground, and determining the phase of the single-phase ammeter according to the phase A test voltage, the phase B test voltage, the phase C test voltage and the test voltage threshold.
Further, the voltage detection unit is also used for collecting and sending the A-phase initial voltage of the A-phase line, the B-phase initial voltage of the B-phase line and the C-phase initial voltage of the C-phase line to the communication unit,
the control unit is further configured to determine an a-phase voltage variation according to the a-phase initial voltage and the a-phase test voltage, determine an a-phase voltage variation according to the B-phase initial voltage and the B-phase test voltage, determine a C-phase voltage variation according to the C-phase initial voltage and the C-phase test voltage, and determine a phase of the single-phase electric meter according to the a-phase voltage variation, the B-phase voltage variation, the C-phase voltage variation, the phase voltage variation threshold, the a-phase test voltage, the B-phase test voltage, the C-phase test voltage, and the test voltage threshold.
Further, the control unit is further configured to detect a grounding time period, and if the grounding time period reaches the measurement time period, generate a phase judgment end instruction, and control the phase detection unit to disconnect the terminal from the ground.
Further, the utility model also comprises an alarm unit,
the alarm unit is used for detecting the state of the same detection unit and judging whether the grounding time length reaches the measurement time length or not
And if the grounding time length reaches the measurement time length and the wiring terminal is not disconnected from the ground, the alarm unit alarms.
Further, the display device also comprises a display unit,
the display unit is connected with the control unit and is used for displaying the phase.
In a third aspect, the embodiment of the invention also provides a meter reading system, which comprises the single-phase meter phase judging device recorded in the embodiment of the invention, an internet of things module and a server,
the Internet of things module is in communication connection with the server, and is used for reading meter and reporting meter reading information to the server, wherein the meter reading information comprises the identity of the single-phase ammeter.
Further, the server is further configured to determine a three-phase imbalance of the ac power grid according to the phase and the meter reading information.
Compared with the prior art, the invention has the beneficial effects that: when the phase of the single-phase ammeter at the user side needs to be measured, the single-phase ammeter phase judging method can control the wiring terminal of the single-phase ammeter to be grounded, the single-phase ammeter can determine the phase of the phase line connected to the single-phase ammeter through the test voltage of each phase line of the alternating-current power grid obtained by the single-phase ammeter after the wiring terminal is grounded, and the analysis of the power load of each phase line of the alternating-current power grid by combining the power consumption information collected by the single-phase ammeter is facilitated based on the phase information of the single-phase ammeter, so that the judgment and adjustment of the three-phase unbalance degree of the alternating-current power grid are facilitated.
Drawings
FIG. 1 is a flow chart of a single-phase electric meter phase judging method in the embodiment;
FIG. 2 is a flow chart of another single-phase electric meter phase judging method in the embodiment;
FIG. 3 is a flow chart of another method for determining the phase of a single-phase meter according to an embodiment;
FIG. 4 is a block diagram showing a single-phase electric meter phase judging apparatus according to the embodiment;
FIG. 5 is a block diagram of another single-phase electric meter phase judging device according to the embodiment;
FIG. 6 is a block diagram of a meter reading system in an embodiment.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a single-phase electric meter phase judging method according to an embodiment, referring to fig. 1, the single-phase electric meter phase judging method includes:
s101, controlling the wiring terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction.
In this embodiment, the single-phase electric meter is configured with a phase line input terminal, a phase line output terminal, a neutral line input terminal, and a neutral line output terminal, and the single-phase electric meter is connected in series in the low-voltage electric line through the phase line input terminal, the phase line output terminal, the neutral line input terminal, and the center line output terminal. In this step, the terminals may be phase input terminals or phase output terminals.
In this embodiment, a ground terminal may be disposed in the single-phase ammeter, and a switch circuit may be disposed between the terminal and the ground terminal. The single-phase ammeter can be provided with a phase detection key, a phase judgment instruction can be triggered through the phase detection key, the phase detection key can be connected with the controller, and the controller can control the wiring terminal to be grounded through the switch circuit after responding to the phase judgment instruction.
S102, acquiring an A-phase test voltage of an A-phase line, a B-phase test voltage of a B-phase line and a C-phase test voltage of a C-phase line.
By way of example, in an embodiment, the a-phase test voltage, the B-phase test voltage, and the C-phase test voltage may be collected by a voltmeter, wherein the voltmeter is configured on a line of an ac power grid and independent of the single-phase electric meter.
Illustratively, the voltmeter is communicatively coupled to a single-phase electric meter, and a controller in the single-phase electric meter may receive the a-phase test voltage, the B-phase test voltage, and the C-phase test voltage transmitted by the voltmeter.
S103, the terminal is controlled to be disconnected from the ground according to the judging ending instruction of the phase.
In this step, the phase determination end command may be triggered by the phase detection key, for example, the phase detection key may be a self-locking key, the phase determination command is triggered when the self-locking key is pressed for the first time, and the phase determination end command is triggered when the self-locking key is pressed again.
The controller may illustratively control the terminal to be disconnected from ground via the switching circuit in response to a phase determination end command.
S104, determining the phase of the single-phase ammeter according to the A-phase test voltage, the B-phase test voltage, the C-phase test voltage and the test voltage threshold.
For example, when the wiring terminal of a single-phase electric meter is grounded, a phase voltage drop phenomenon occurs in a line connected to the single-phase electric meter.
In the step, a test voltage threshold is configured in the controller, after the controller obtains an A-phase test voltage, a B-phase test voltage and a C-phase test voltage, the relationship between each phase test voltage and the test voltage threshold is compared, and if the test voltage of a certain phase is smaller than the test voltage threshold, the phase of the phase line is judged to be the phase of the single-phase ammeter.
In this step, the minimum value of the a-phase test voltage, the B-phase test voltage, and the C-phase test voltage may be determined, and the phase of the single-phase electric meter may be determined according to the line corresponding to the minimum value, for example, if the a-phase test voltage is the minimum value, the phase of the single-phase electric meter is the a-phase.
When the phase of the single-phase ammeter at the user side needs to be measured, the single-phase ammeter phase judging method provided by the embodiment can control the wiring terminal of the single-phase ammeter to be grounded, the single-phase ammeter can determine the phase of each phase line of the AC power grid obtained by the single-phase ammeter after the wiring terminal is grounded, and the analysis of the power load of each phase line of the AC power grid based on the phase information of the single-phase ammeter is facilitated by combining the power information collected by the single-phase ammeter, so that the judgment and adjustment of the three-phase unbalance degree of the AC power grid are facilitated.
Fig. 2 is a flowchart of another single-phase electric meter phase judging method in the embodiment, referring to fig. 2, the single-phase electric meter phase judging method may be:
s201, controlling the wiring terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction.
S202, judging whether the grounding time length of the wiring terminal reaches the measurement time length.
In an ac power grid, if the voltage of a phase line is low for a long time, the power load of the phase line is easy to be in an under-voltage running state, and meanwhile, the voltage of other two phases of lines is raised, so that the distribution stability and distribution quality of a user side are affected, and the relay of the ac power grid is damaged when serious, so that the ac power grid trips abnormally.
In this step, the measured time length is a set value, and in order to avoid abnormal faults of the ac power grid, the measured time length is generally 1 to 5 seconds.
S203, if the grounding time length reaches the measurement time length, acquiring an A-phase test voltage, a B-phase test voltage and a C-phase test voltage.
In this step, the a-phase test voltage of the a-phase line, the B-phase test voltage of the B-phase line, and the C-phase test voltage of the C-phase line are obtained after the grounding time reaches the measurement time, so as to avoid the problem that the grounding time is too short, the voltage changes of each phase are small, and each phase test voltage is difficult to be used for determining the phase of the single-phase electric meter.
S204, the terminal is controlled to be disconnected from the ground according to the judging end instruction of the phase.
S205, determining the minimum value of the A-phase test voltage, the B-phase test voltage and the C-phase test voltage, and determining the phase of the single-phase ammeter according to the line corresponding to the minimum value.
In the single-phase ammeter phase judging method shown in fig. 2, the time length of the grounding of the wiring terminal of the user side single-phase ammeter is set, so that the problem of AC power grid faults caused by phase tests can be avoided.
Fig. 3 is a flowchart of another single-phase electric meter phase judging method according to the embodiment, referring to fig. 3, the single-phase electric meter phase judging method may be:
s301, acquiring initial voltage of A phase of an A-phase line, initial voltage of B phase of a B-phase line and initial voltage of C phase of a C-phase line of an alternating current power grid.
In this step, the a-phase initial voltage, the B-phase initial voltage, and the C-phase initial voltage may be collected by a voltmeter, and the voltmeter is in communication with the single-phase ammeter, and a controller in the single-phase ammeter may receive the a-phase initial voltage, the B-phase initial voltage, and the C-phase initial voltage sent by the voltmeter.
Illustratively, in this step, each phase initial voltage is the phase voltage before the single-phase meter terminal is not grounded.
S302, controlling the wiring terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction.
S303, judging whether the grounding time length of the terminal reaches the measurement time length.
S304, if the grounding time length reaches the measurement time length, acquiring an A-phase test voltage, a B-phase test voltage and a C-phase test voltage.
S305, controlling the terminal to be disconnected from the ground according to the end instruction of the phase judgment.
S306, determining the A-phase voltage variation according to the A-phase initial voltage and the A-phase test voltage, determining the A-phase voltage variation according to the B-phase initial voltage and the B-phase test voltage, and determining the C-phase voltage variation according to the C-phase initial voltage and the C-phase test voltage.
In this step, for example, the difference between the a-phase test voltage and the a-phase initial voltage, the difference between the B-phase test voltage and the B-phase initial voltage, and the difference between the C-phase test voltage and the C-phase initial voltage may be calculated, and the difference may be used as the phase voltage variation of each phase line.
S307, determining the phase of the single-phase ammeter according to the phase A voltage variation, the phase B voltage variation, the phase C voltage variation, the phase voltage variation threshold, the phase A test voltage, the phase B test voltage, the phase C test voltage and the test voltage threshold.
The period of time when different electric loads are connected into each phase line of the alternating current power grid has larger randomness, and the power of the different electric loads also has larger difference, so that the phase voltage of each phase line in the alternating current power grid also fluctuates within a certain range.
In this step, a phase voltage change threshold is set, and if the phase voltage change amount of a phase line is greater than the phase voltage change threshold and the test voltage of the phase line is less than the test voltage threshold, the phase of the phase line is determined to be the phase of the single-phase ammeter.
In the step, the phase voltage variation of each phase line and the test voltage threshold are combined to determine the phase of the single-phase ammeter, so that the problem of inaccurate phase judgment of the single-phase ammeter caused by that the multiphase test voltage is smaller than the test voltage threshold or the multiphase phase voltage variation is larger than the phase voltage variation threshold due to the fact that the phase voltage variation or the test voltage threshold judges the phase of the ammeter.
In the single-phase meter phase judgment method shown in fig. 3, before the wiring terminal of the single-phase meter is grounded, the initial voltage of each phase line is obtained, after the wiring terminal is grounded, the test voltage of each phase line is obtained, the voltage variation of each phase line can be determined through the initial voltage and the test voltage, and the accuracy of single-phase meter phase judgment can be improved through the voltage variation, the test voltage threshold value and the phase voltage variation threshold value.
Example two
Fig. 4 is a block diagram of a single-phase-meter-phase-judging device according to an embodiment, and referring to fig. 4, the present embodiment provides a single-phase-meter-phase-judging device, which includes a voltage detecting unit 100, a control unit 202, a phase detecting unit 201, and a communication unit 203.
The control unit 202 is connected to the phase detection unit 201 and the communication unit 203, respectively, and the voltage detection unit 100 is connected to the control unit 202 through the communication unit 203.
The voltage detection unit 100 is configured to collect and send an a-phase test voltage of an a-phase line, a B-phase test voltage of a B-phase line, and a C-phase test voltage of a C-phase line to the communication unit 203.
The control unit 202 is configured to control the phase detection unit 201 to connect the terminal 204 of the single-phase electric meter connected to the ac power grid to ground in response to the phase determination instruction, and control the phase detection unit 201 to disconnect the terminal 204 from ground in response to the phase determination end instruction, and determine the phase of the single-phase electric meter according to the a-phase test voltage, the B-phase test voltage, the C-phase test voltage, and the test voltage threshold.
Illustratively, in the present embodiment, the phase detecting unit 201, the control unit 202, the communication unit 203, and the terminal 204 are disposed in the unidirectional electricity meter 200 at the user side. The voltage detection unit 100 may be a three-phase voltmeter that is configured on a line of the ac power grid and is independent of the single-phase ammeter 200.
As an embodiment, the voltage detection unit is further configured to collect and send an a-phase initial voltage of the a-phase line, a B-phase initial voltage of the B-phase line, and a C-phase initial voltage of the C-phase line to the communication unit.
Exemplary, single-phase electric meter phase judging device operation includes:
and 1, controlling the connection terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction.
And 2, acquiring an A-phase test voltage of the A-phase line, a B-phase test voltage of the B-phase line and a C-phase test voltage of the C-phase line.
And 3, controlling the terminal to be disconnected from the ground according to the judging ending instruction of the phase.
Fig. 5 is a block diagram of another single-phase electric meter phase judging apparatus according to an embodiment, and referring to fig. 5, as an alternative embodiment, the single-phase electric meter phase judging apparatus further includes an alarm unit 205.
The alarm unit is configured in the single-phase ammeter, the alarm unit is connected with the other detection unit and the control unit, the alarm unit is used for detecting the state of the other detection unit, judging whether the grounding time length reaches the measurement time length, and if the grounding time length reaches the measurement time length, the terminal is not disconnected from the ground, the alarm unit alarms.
The alarm unit may obtain the grounding time length configured in the controller, and the alarm unit may have a current detection function, and after the grounding time length reaches the measurement time length, the alarm unit may detect whether current still passes through the same detection unit, and if so, alarm.
For example, a switch circuit may be configured in the phase detection unit, the switch circuit including a scram switch, and when the alarm unit alarms, the single-phase ammeter operator may disconnect the switch circuit through the scram switch, so that the terminal is disconnected from the ground.
By configuring the alarm unit, the safety performance of the single-phase electric meter phase judgment device can be improved, and the problem of AC power grid faults caused by phase judgment can be effectively avoided.
And 4, determining the phase of the single-phase ammeter according to the A-phase test voltage, the B-phase test voltage, the C-phase test voltage and the test voltage threshold.
As an implementation manner, the control unit is further configured to detect the grounding time period, and if the grounding time period reaches the measured time period, generate a phase judgment end instruction, and control the phase detection unit to disconnect the terminal from the ground.
The working process of the single-phase meter phase judging device further comprises:
and 1, controlling the connection terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction.
And 2, judging whether the grounding time length of the wiring terminal reaches the measurement time length.
And step 3, if the grounding time length reaches the measurement time length, acquiring an A-phase test voltage, a B-phase test voltage and a C-phase test voltage.
And 4, controlling the terminal to be disconnected from the ground according to the judging ending instruction of the phase.
And 5, determining the minimum value of the A-phase test voltage, the B-phase test voltage and the C-phase test voltage, and determining the phase of the single-phase ammeter according to the line corresponding to the minimum value.
As an embodiment, the voltage detection unit is further configured to collect and send an a-phase initial voltage of the a-phase line, a B-phase initial voltage of the B-phase line, and a C-phase initial voltage of the C-phase line to the communication unit.
The control unit is also used for determining the A-phase voltage variation according to the A-phase initial voltage and the A-phase test voltage, determining the A-phase voltage variation according to the B-phase initial voltage and the B-phase test voltage, determining the C-phase voltage variation according to the C-phase initial voltage and the C-phase test voltage, and determining the phase of the single-phase ammeter according to the A-phase voltage variation, the B-phase voltage variation, the C-phase voltage variation, the phase voltage variation threshold and the minimum value.
The working process of the single-phase meter phase judging device further comprises:
and step 1, acquiring an A-phase initial voltage of an A-phase line, a B-phase initial voltage of a B-phase line and a C-phase initial voltage of a C-phase line of an alternating current power grid.
And 2, controlling the wiring terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction.
And 3, judging whether the grounding time length of the wiring terminal reaches the measurement time length.
And step 4, if the grounding time length reaches the measurement time length, acquiring an A-phase test voltage, a B-phase test voltage and a C-phase test voltage.
And 5, controlling the terminal to be disconnected from the ground according to the judging ending instruction of the phase.
And 6, determining the A-phase voltage variation according to the A-phase initial voltage and the A-phase test voltage, determining the A-phase voltage variation according to the B-phase initial voltage and the B-phase test voltage, and determining the C-phase voltage variation according to the C-phase initial voltage and the C-phase test voltage.
And 7, determining the phase of the single-phase ammeter according to the phase A voltage variation, the phase B voltage variation, the phase C voltage variation, the phase voltage variation threshold, the phase A test voltage, the phase B test voltage, the phase C test voltage and the test voltage threshold.
Referring to fig. 5, the single-phase electric meter phase judging apparatus may further include a display unit 206, the display unit 206 being connected to the control unit 202, the display unit 206 being configured to display the phase.
By configuring the display unit, a meter reading person can directly record the phase of the single-phase ammeter when the meter is read manually, so that the convenience for acquiring the phase information of the single-phase ammeter is improved.
Example III
The embodiment provides a meter reading system, which comprises any one of the single-phase meter phase judging devices described in the second embodiment, an internet of things module and a server.
Fig. 6 is a block diagram of a meter reading system according to an embodiment, and referring to fig. 6, the single-phase meter phase judging device includes a voltage detecting unit 100, a single-phase ammeter 200, an internet of things module 300, and a server 400. The voltage detection unit 100 is connected with the single-phase electricity meter 200, and the single-phase electricity meter 200 is connected with the server 400 through the internet of things module 300.
The internet of things module is used for reading meter and reporting meter reading information to the server, wherein the meter reading information comprises the identity of the single-phase ammeter. The server is also used for determining the three-phase unbalance degree of the alternating current power grid according to the meter reading information.
The server can effectively analyze the power load of each phase line of the alternating current power grid based on summarized meter reading information of the single-phase electric meter, and is convenient for judging and adjusting the three-phase unbalance degree of the alternating current power grid.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. A single-phase meter phase identification method, comprising:
controlling the wiring terminal of the single-phase ammeter connected with the alternating-current power grid to be grounded according to the phase judgment instruction;
judging whether the grounding time length of the wiring terminal reaches the measurement time length or not;
if the grounding time length reaches the measurement time length, acquiring an A-phase test voltage of an A-phase line, a B-phase test voltage of a B-phase line and a C-phase test voltage of a C-phase line through a voltage detection unit, and controlling the terminal to be disconnected from the ground according to a phase judgment ending instruction;
the voltage detection unit is independent of the single-phase ammeter;
further comprises:
before the wiring terminal of the single-phase ammeter is grounded, acquiring an A-phase initial voltage of an A-phase line, a B-phase initial voltage of a B-phase line and a C-phase initial voltage of a C-phase line of an alternating current power grid;
determining an A-phase voltage variation according to the A-phase initial voltage and the A-phase test voltage, determining a B-phase voltage variation according to the B-phase initial voltage and the B-phase test voltage, and determining a C-phase voltage variation according to the C-phase initial voltage and the C-phase test voltage;
determining the phase of the single-phase ammeter according to the A-phase voltage variation, the B-phase voltage variation, the C-phase voltage variation, the phase voltage variation threshold, the A-phase test voltage, the B-phase test voltage, the C-phase test voltage and the test voltage threshold comprises the following steps:
and if the phase voltage variation of the phase line is larger than the phase voltage variation threshold and the test voltage of the phase line is smaller than the test voltage threshold, determining that the phase of the phase line is the phase of the single-phase ammeter.
2. The single-phase ammeter phase judging device is characterized by comprising a voltage detecting unit, a control unit, a phase detecting unit and a communication unit;
the control unit is respectively connected with the phase detection unit and the communication unit, and the voltage detection unit is in communication connection with the control unit through the communication unit;
the voltage detection unit is used for collecting and sending an A-phase test voltage of an A-phase line, a B-phase test voltage of a B-phase line and a C-phase test voltage of a C-phase line to the communication unit;
the control unit is used for responding to the phase judgment instruction and controlling the phase detection unit to connect the wiring terminal of the single-phase ammeter connected with the alternating current network to the ground;
the voltage detection unit is independent of the single-phase ammeter;
the voltage detection unit is also used for collecting and sending an A-phase initial voltage of an A-phase line, a B-phase initial voltage of a B-phase line and a C-phase initial voltage of a C-phase line to the communication unit before the wiring terminal of the single-phase ammeter is grounded;
the control unit is further configured to determine an a-phase voltage variation according to the a-phase initial voltage and the a-phase test voltage, determine an a-phase voltage variation according to the B-phase initial voltage and the B-phase test voltage, determine a C-phase voltage variation according to the C-phase initial voltage and the C-phase test voltage, and determine a phase of the single-phase electric meter according to the a-phase voltage variation, the B-phase voltage variation, the C-phase voltage variation, a phase voltage variation threshold, the a-phase test voltage, the B-phase test voltage, the C-phase test voltage, and a test voltage threshold, and include:
if the phase voltage variation of a phase line is larger than the phase voltage variation threshold and the test voltage of the phase line is smaller than the test voltage threshold, determining that the phase of the phase line is the phase of the single-phase ammeter;
the control unit is also used for detecting the grounding time length, and if the grounding time length reaches the measured time length, a phase judgment ending instruction is generated to control the phase detection unit to disconnect the wiring terminal from the ground.
3. The single-phase electric meter phase judging apparatus as claimed in claim 2, further comprising an alarm unit;
the alarm unit is used for detecting the state of the same detection unit and judging whether the grounding time length reaches the measurement time length or not;
and if the grounding time length reaches the measurement time length and the wiring terminal is not disconnected from the ground, the alarm unit alarms.
4. The single-phase electric meter phase judging apparatus as claimed in claim 2, further comprising a display unit;
the display unit is connected with the control unit and is used for displaying the phase.
5. The meter reading system is characterized by comprising the single-phase meter phase judging device according to claim 2, an internet of things module and a server;
the Internet of things module is in communication connection with the server, and is used for reading meter and reporting meter reading information to the server, wherein the meter reading information comprises the identity of the single-phase ammeter.
6. The meter reading system of claim 5, wherein the server is further configured to determine a three-phase imbalance of an ac power grid based on the meter reading information.
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| CN102955098B (en) * | 2012-12-10 | 2016-08-03 | 四川省电力公司资阳公司 | System with non effectively earth ed neutral singlephase earth fault recognition methods |
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| CN105372478B (en) * | 2015-09-30 | 2018-08-10 | 成都协瑞珂科技有限公司 | Distribution line transient state checking for grounded current method and device |
| CN105866615B (en) * | 2016-06-16 | 2019-03-19 | 山东大学 | 10kV distribution line disconnection fault determination method based on three-phase voltage current |
| CN206331107U (en) * | 2016-12-07 | 2017-07-14 | 湖南龙之翔智能科技有限公司 | Power failure detection circuit of single-phase intelligent electric meter |
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