CN116203306A - Power failure sensing method and system for electric energy meter - Google Patents
Power failure sensing method and system for electric energy meter Download PDFInfo
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- CN116203306A CN116203306A CN202211607154.8A CN202211607154A CN116203306A CN 116203306 A CN116203306 A CN 116203306A CN 202211607154 A CN202211607154 A CN 202211607154A CN 116203306 A CN116203306 A CN 116203306A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/145—Indicating the presence of current or voltage
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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Abstract
The invention discloses a power failure sensing method and a system for an electric energy meter, wherein the method comprises the following steps: 1) Detecting power failure of a front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data; 2) Detecting power failure of the later stage of the electric energy meter; if the power failure of the rear stage of the electric energy meter is not detected, continuously performing power failure detection of the rear stage of the electric energy meter in a preset time, and if the power failure of the rear stage of the electric energy meter is not detected in the preset time, controlling a relay unit corresponding to the electric energy meter to be switched on; 3) After the power failure sensing unit enters a dormant state, the power-on detection is carried out on the rear stage of the electric energy meter; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on. The invention can correctly capture the power failure at the moment of the power failure of the commercial power, ensures that sufficient energy is available to control the relay to switch off and store data, and ensures safer data storage.
Description
Technical Field
The invention mainly relates to the technical field of electric energy meters, in particular to a power failure sensing method and system of an electric energy meter.
Background
The functions of power failure switching-off and data storage of the electric energy meter are that a method of simply detecting the power failure of a later stage is adopted, and a method of sending out power failure interruption through a metering chip is also adopted. In the method for simply detecting the power failure of the later stage, in order to control the relay to switch off and save data when the power failure occurs, a plurality of capacitors are added in the later stage circuit, so that the cost is increased, meanwhile, the capacity of the capacitors is poor along with the time, and the switching off and the data saving can not be met. The method for detecting the power failure of the metering chip can select half cycle detection time, also can select one cycle detection time, the detection time is too short, the fluctuation of the power grid can cause the misoperation of the relay, and the voltage is 0 in half cycle because the power failure of the mains supply is very fast when the detection time is too long, so that the metering chip cannot completely capture the power failure.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems existing in the prior art, the invention provides the power failure sensing method and the power failure sensing system for the electric energy meter, which can accurately capture power failure at the moment of power failure of a commercial power, ensure that sufficient energy is used for controlling the relay to switch off and store data, and ensure safer data storage.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a power failure sensing method of an electric energy meter comprises the following steps:
1) Detecting power failure of a front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data;
2) Detecting power failure of the later stage of the electric energy meter; if the power failure of the later stage of the electric energy meter is detected, the power failure sensing unit corresponding to the electric energy meter enters a dormant state; if the power failure of the rear stage of the electric energy meter is not detected, continuously performing power failure detection of the rear stage of the electric energy meter in a preset time, and if the power failure of the rear stage of the electric energy meter is not detected in the preset time, controlling a relay unit corresponding to the electric energy meter to be switched on; if the later stage of the electric energy meter is detected within the preset time, the power failure sensing unit enters a dormant state;
3) After the power failure sensing unit enters a dormant state, the power-on detection is carried out on the rear stage of the electric energy meter; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on.
Preferably, in step 3), when the later stage of the electric energy meter is detected to be electrified, jitter elimination delay is performed, normal electrification is determined, then an initialization flow is entered, and electrification recovery is performed on the electric quantity data.
Preferably, the step of power-on recovery is as follows:
starting to read EEPROM data and performing CRC; if the verification is correct, recovering the data of the electric energy meter;
if the CRC is wrong, recovering the electric quantity data from the EEPROM backup area, and judging whether the electric quantity data are correct or not; if the data is correct, recovering the data of the electric energy meter; if not, the data of the EEPROM main storage area is transferred to the electric quantity buffer area;
and determining whether the data of the power-down backup data area need to be restored to the electric quantity related buffer area according to the CRC check of the power-down EEPROM, and recalculating the CRC.
Preferably, after the power failure of the electric energy meter, the power failure reporting is performed. The method comprises the following specific steps:
(1) The node judges that the power failure occurs, randomly waits for time, randomly windows (n, m), and units: ms;
(2) When the waiting time expires, generating a power-off message and sending the power-off message;
(3) After the power-off message is sent, waiting for T seconds to perform data collection work, analyzing each time the power-off message is received in the waiting period, and updating the analysis result and the stored information union set into an updated result, wherein each sending time is expired and the updated result is used for generating the power-off message;
(4) Judging whether the waiting time T expires; if yes, judging whether the maximum transmission times N are reached, if not, returning to the step (1) to continue transmission, and if so, ending the collection;
(5) The uninterrupted power node reports a power failure sensing message to the CCO;
(6) 1, station power failure report: once a 1-hop station fails, the CCO directly processes its outage information, but the CCO does not acknowledge.
Preferably, the specific process of step (5) is as follows: and after the non-outage node receives the first frame of outage information message, the node starts to wait for a certain time, all the outage information received in the waiting period is analyzed and subjected to union operation, and after the waiting time expires, the final result is obtained to generate a message unicast and reported to the CCO.
Preferably, in step (2), a local broadcast mode is adopted to send a power-off message.
The invention also discloses a power failure sensing system of the electric energy meter, which comprises a front-stage detection unit and a rear-stage detection unit; the front-stage detection unit is used for detecting power failure of the front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data; the post-stage detection unit is used for detecting power failure of the post-stage of the electric energy meter; if the power failure of the later stage of the electric energy meter is detected, the power failure sensing unit corresponding to the electric energy meter enters a dormant state; if the power failure of the rear stage of the electric energy meter is not detected, continuously performing power failure detection of the rear stage of the electric energy meter in a preset time, and if the power failure of the rear stage of the electric energy meter is not detected in the preset time, controlling a relay unit corresponding to the electric energy meter to be switched on; if the later stage of the electric energy meter is detected within the preset time, the power failure sensing unit enters a dormant state; the power-on detection unit is used for carrying out power-on detection on the rear stage of the electric energy meter after the power failure sensing unit enters the dormant state; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on.
Preferably, the front-stage detection unit comprises a rectifying voltage limiting circuit and a front-stage detection circuit, wherein the rectifying voltage limiting circuit comprises diodes D1-D3, a zener diode VD1 and resistors R1, R3 and R4; the anodes of the diodes D1-D3 are respectively connected with the input ends of each phase of the electric energy meter, the cathodes of the diodes D1-D3 are respectively connected with one ends of the resistors R1, R3 and R4, the other ends of the resistors R1, R3 and R4 are connected with the cathode of the voltage-stabilizing diode VD1, and the anode of the voltage-stabilizing diode VD1 is connected with the input end of the front-stage detection circuit.
Preferably, the pre-stage detection circuit includes a power supply VDD, a triode Q1M, a resistor R50M, R51M, R M, and a capacitor C51M, C M, wherein a base electrode of the triode Q1M is connected to an anode of the zener diode VD1, one ends of the resistor R52M and the capacitor C53 are connected to a base electrode of the triode Q1M, another ends of the resistor R52M and the capacitor C53 are connected to an emitter electrode of the triode Q1M and grounded, the power supply VDD is connected to a collector electrode of the triode Q1M through the resistor R51M, and the collector electrode of the triode Q1M is sequentially grounded through the resistor R50M and the capacitor C51M.
Compared with the prior art, the invention has the advantages that:
the invention can solve the problem that the prior art can not effectively control the switching-on and the data storage of the relay when the power is lost, can correctly capture the power loss at the moment of the power loss of the commercial power, ensures that sufficient energy is used for controlling the switching-on and the data storage of the relay, ensures safer data storage and reduces the cost of simple post-detection.
Drawings
Fig. 1 is a schematic circuit diagram of a front stage detection unit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a later stage detection unit according to an embodiment of the present invention.
Fig. 3 is a waveform diagram of all three phases of ac A, B, C with voltage in the present invention.
Fig. 4 is a waveform diagram of the voltage of only two phases of the three phases of the alternating current A, B, C in the present invention.
Fig. 5 is a waveform diagram of the voltage of only one phase of three phases of alternating current A, B, C in the present invention.
Fig. 6 is a waveform diagram of all three phases of ac A, B, C without voltage in the present invention.
FIG. 7 is a flowchart of a power outage detection method according to an embodiment of the present invention.
FIG. 8 is a flowchart of the power-on sensing and power-on recovery of data according to the present invention; wherein (a) is an upper-level inductive flow chart; (b) a power-on recovery flow chart of the electric quantity data.
Fig. 9 is a schematic diagram of the power outage stage of the present invention.
Fig. 10 is a flow chart of a power outage report according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As shown in fig. 7, the power failure sensing method of the electric energy meter according to the embodiment of the invention includes the following steps:
1) Detecting power failure of a front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data; if the power failure of the front stage of the electric energy meter cannot be detected, the detection is continuously carried out;
2) Detecting power failure of the later stage of the electric energy meter; if the power failure of the later stage of the electric energy meter is detected, the power failure sensing unit corresponding to the electric energy meter enters a dormant state; if the power failure of the rear stage of the electric energy meter is not detected, the power failure detection of the rear stage of the electric energy meter is continuously carried out within a preset time (for example, 5-15 s), and if the power failure of the rear stage of the electric energy meter is not detected within the preset time, the corresponding relay unit of the electric energy meter is controlled to be switched on; if the later stage of the electric energy meter is detected within the preset time, the power failure sensing unit enters a dormant state;
3) After the power failure sensing unit enters a dormant state, the power-on detection is carried out on the rear stage of the electric energy meter; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on.
The invention can solve the problem that the prior art can not effectively control the switching-on and the data storage of the relay when the power is lost, can correctly capture the power loss at the moment of the power loss of the commercial power, ensures that sufficient energy is used for controlling the switching-on and the data storage of the relay, ensures safer data storage and reduces the cost of simple post-detection.
In one embodiment, the method further comprises power outage-aware field restoration. When the power-on is detected, the jitter elimination delay is carried out according to the state of the system, the normal power-on is determined, then a software initialization flow is entered, the power-on recovery is carried out on the electric quantity data, and the specific flow is as follows: and (3) starting to read the EEPROM data and performing CRC (cyclic redundancy check), if the check is correct, recovering the data of the electric energy meter, and if the CRC is wrong, recovering the power-down data from the main backup area. The specific power-on sensing and power-on recovery flow of the power-on data is shown in fig. 8. The method comprises the following steps: starting to read EEPROM data and performing CRC; if the verification is correct, recovering the data of the electric energy meter; if the CRC is wrong, recovering the electric quantity data from the EEPROM backup area, and judging whether the electric quantity data are correct or not; if the data is correct, recovering the data of the electric energy meter; if not, the data of the EEPROM main storage area is transferred to the electric quantity buffer area; and determining whether the data of the power-down backup data area need to be restored to the electric quantity related buffer area according to the CRC check of the power-down EEPROM, and recalculating the CRC.
In a specific embodiment, as shown in fig. 9, when an ammeter in a certain area in a transformer area fails, a communication module of the power failure ammeter immediately sends power failure sensing information to the outside, and a non-power failure ammeter module normally receives and forwards data. The whole power failure reporting process is divided into two stages of information gathering and information reporting, so that the generation of concentrated network storm is reduced, and the reporting reliability is improved.
The power failure reporting flow is shown in figure 10. When the power failure node sends a power failure message, a waiting time (random in a window) is firstly random, so that the data sending time of the node in the same conflict domain is scattered, and the conflict probability is reduced. In order to solve the problem of failure of the original unicast route after power failure, a local broadcast mode is suggested, and each power failure node analyzes and merges the received power failure messages, so that all power failure information can be reported to the CCO only by one node successfully reporting, and the method is more robust. Because the channel is in a disconnected state after power failure, the conflict domain can be greatly reduced, all power failure nodes can periodically send data outwards, and the reliability is enhanced.
The specific work flow of the power failure report is as follows:
(1) The node judges that the power failure occurs, randomly waits for time, randomly windows (n, m), and units: ms;
(2) When the waiting time expires, generating a power-off message, and transmitting the power-off message in a local broadcasting mode;
(3) After the local power failure message is sent, waiting for T seconds to perform data collection work, analyzing every time the power failure message is received in the waiting period, and updating the analysis result and the stored information union set into an updated result, wherein the updated result is used for generating the power failure message when each sending time is expired;
(4) Whether the waiting time T expires; if yes, judging whether the maximum sending times N are reached, and if yes, ending the collection.
Table 2 key parameter value table
| Parameters (parameters) | Suggested value |
| (n，m) | Random window for transmission time dispersion between different nodes, n=0 ms, m=200 ms |
| T | Time interval for periodically sending power-off message, t=1s |
| N | The total number of times each powered off node sends a power off message, n=10 (the parameter can be set) |
Each power failure node, the capacitor supports static power consumption of about 20s and broadcast frames of +10 frames.
(5) And the uninterrupted power node reports a power failure sensing message to the CCO.
And after the uninterrupted power supply node receives the first frame of power supply information message, the uninterrupted power supply node starts to wait for 30s (related to n, m and T parameters), all the received power supply information in the waiting period is analyzed and subjected to union operation, and after the waiting time expires, the final result is obtained to generate a message, and the message is unicast and reported to the CCO. Because the power failure physical line is in a disconnected state, and the simplification scheme is considered, each uninterrupted power node can carry out the same processing after receiving the power failure message, and the distinction is not carried out.
(6) 1 jump site power outage reporting
Once a 1-hop site fails, the CCO can directly process its outage information, but the CCO does not acknowledge.
As shown in fig. 1 and fig. 2, the power failure sensing system of the electric energy meter provided by the embodiment of the invention comprises a front-stage detection unit and a rear-stage detection unit; the front-stage detection unit is used for detecting power failure of the front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data; the post-stage detection unit is used for detecting power failure of the post-stage of the electric energy meter; if the power failure of the later stage of the electric energy meter is detected, the power failure sensing unit corresponding to the electric energy meter enters a dormant state; if the power failure of the rear stage of the electric energy meter is not detected, continuously performing power failure detection of the rear stage of the electric energy meter in a preset time, and if the power failure of the rear stage of the electric energy meter is not detected in the preset time, controlling a relay unit corresponding to the electric energy meter to be switched on; if the later stage of the electric energy meter is detected within the preset time, the power failure sensing unit enters a dormant state; the power-on detection unit is used for carrying out power-on detection on the rear stage of the electric energy meter after the power failure sensing unit enters the dormant state; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on.
As shown in fig. 1, the front-stage detection unit comprises a rectifying voltage-limiting circuit and a front-stage detection circuit, wherein the rectifying voltage-limiting circuit comprises diodes D1-D3, a zener diode VD1 and resistors R1, R3 and R4; the anodes of the diodes D1-D3 are respectively connected with the input ends of each phase of the electric energy meter, the cathodes of the diodes D1-D3 are respectively connected with one ends of the resistors R1, R3 and R4, the other ends of the resistors R1, R3 and R4 are connected with the cathode of the voltage-stabilizing diode VD1, and the anode of the voltage-stabilizing diode VD1 is connected with the input end of the front-stage detection circuit.
The front-stage detection circuit comprises a power supply VDD, a triode Q1M, a resistor R50M, R51M, R M, a capacitor C51M, C53M, wherein the base electrode of the triode Q1M is connected with the anode of a voltage-stabilizing diode VD1, one end of the resistor R52M and one end of the capacitor C53 are connected with the base electrode of the triode Q1M, the other end of the resistor R52M and the other end of the capacitor C53 are connected with the emitting electrode of the triode Q1M and grounded, the power supply VDD is connected with the collecting electrode of the triode Q1M through the resistor R51M, and the collecting electrode of the triode Q1M is sequentially grounded through the resistor R50M and the capacitor C51M. Wherein diodes D1-D3 constitute half-wave rectification; the output end of the triode Q1M is connected with an IO port VT_CHK of the singlechip; when the three-phase power input makes the instantaneous voltage of the zener diode VD1 higher than the voltage of the zener diode, vt_chk is low, whereas vt_chk is high.
As shown in fig. 2, the later stage detection unit mainly includes a resistor R1P, R4P, R P, a zener diode D1P, and a transistor Q1P. When the input voltage is higher than the sum of the voltage stabilizing diode D1P and the Vbe of the triode Q1P, the VIN_INT pin of the singlechip is at a low level, and conversely, the VIN_INT pin is at a high level.
The invention is described in further detail below in connection with fig. 1:
the three-phase input of alternating current A, B, C is conducted through the D1, D2 and D3 diodes and then through the current limiting resistors R1, R3 and R4, and the base voltage of the Q1M triode reaches 0.7V when the 180V voltage stabilizing tube is conducted, the instantaneous voltage of the three-phase input of alternating current A, B, C needs to be more than or equal to 180.7V.
Taking a 220V rated voltage electric energy meter as an example, when the instantaneous voltage of a three-phase power supply is lower than 180V, the front-stage sensing unit detects high level and judges that power is lost, and the requirement of 60% Un (the instantaneous maximum voltage is 187V) of the critical voltage is met.
The three-phase power failure condition can occur in the following four conditions:
case 1: as shown in fig. 3, the alternating current A, B, C has all three phases with voltages. In this case, the angle higher than 180V in one cycle is 36 ° to 144 °,156 ° to 264 °, and the front stage sensing unit is at a low level. The mains frequency is 50Hz, and the time for which the instantaneous voltage is greater than 180V in one cycle is equal to 216/360 x 20 ms=12 ms. The time of the low level detected by the pre-stage sensing unit is 12ms, and the high level is 8ms.
Case 2: as shown in fig. 4, the alternating current A, B, C has only two phases of voltage. In this case only the voltage between t1, t2 is greater than 20.7V in one cycle. At t1 the angle = arcsin (20.7/230), the angle is between 0 and 90 degrees, so the angle of t1 is 6 degrees and the angle of t2 is 174+120 = 294 degrees. The mains frequency is 50Hz and the time for which the instantaneous voltage is greater than 20.7V in one cycle is equal to (294-6)/360/50=16 ms. The preceding stage detects a low level of 16ms and a high level of 4ms.
Case 3: as shown in fig. 5, the alternating current A, B, C has only one phase voltage for three phases. In this case, the angle of more than 180V is 36 ° to 144 ° in one cycle, and the front stage sensing unit is at a low level. The mains frequency is 50Hz and the time for which the instantaneous voltage is greater than 180V in one cycle is equal to 108/360 x 20 ms=6 ms. The time of the low level is 6ms and the high level is 14ms.
Case 4: as shown in fig. 6, all three phases of alternating current A, B, C have no voltage input. In this case no voltage is greater than 180V in one cycle. The low level time of the front-stage sensing unit is 0ms, and the high level time is 20ms.
The following conclusions are drawn according to the four cases:
table 1 decompression analysis table
| Project | No pressure loss | Single-phase voltage-loss | Biphase decompression | No voltage |
| The front stage detects the high level time in a period | 0ms | 4ms | 10.5ms | 20ms |
| The preceding stage detects the low level time in a period | 20ms | 16ms | 9.5ms | 0ms |
Thus, if the high level time detected by the pre-stage detection unit is detected with a resolution of 1ms and is greater than 10.5ms, the power is considered to be lost. Since the commercial power may have jitter, if the time required to continuously detect 50ms is high level, the power is considered to be lost, if the time is low level once, the time is cleared to 0, and the timing is started from the new time; and if the current-stage detection unit detects power failure, the relay is controlled to switch off and data are stored.
In the working flow of the electric energy meter, the singlechip detects whether the front stage is powered down every millisecond, the current stage is powered down, the relay is controlled to switch off and save data, the rear stage detects that the power is powered down, and the electric energy meter enters a dormant state. When the later stage detects that the power-on is detected, the work can be continued according with the requirements. The whole power failure detection flow is shown in fig. 7.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. The power failure sensing method for the electric energy meter is characterized by comprising the following steps of:
1) Detecting power failure of a front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data;
2) Detecting power failure of the later stage of the electric energy meter; if the power failure of the later stage of the electric energy meter is detected, the power failure sensing unit corresponding to the electric energy meter enters a dormant state; if the power failure of the rear stage of the electric energy meter is not detected, continuously performing power failure detection of the rear stage of the electric energy meter in a preset time, and if the power failure of the rear stage of the electric energy meter is not detected in the preset time, controlling a relay unit corresponding to the electric energy meter to be switched on; if the later stage of the electric energy meter is detected within the preset time, the power failure sensing unit enters a dormant state;
3) After the power failure sensing unit enters a dormant state, the power-on detection is carried out on the rear stage of the electric energy meter; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on.
2. The power failure sensing method of an electric energy meter according to claim 1, wherein in step 3), when the power-up of the later stage of the electric energy meter is detected, a jitter elimination delay is performed, the normal power-up is determined, and then an initialization flow is entered to perform power-up recovery on electric quantity data.
3. The method for sensing power failure of an electric energy meter according to claim 2, wherein the step of power-on recovery is:
starting to read EEPROM data and performing CRC; if the verification is correct, recovering the data of the electric energy meter;
if the CRC is wrong, recovering the electric quantity data from the EEPROM backup area, and judging whether the electric quantity data are correct or not; if the data is correct, recovering the data of the electric energy meter; if not, the data of the EEPROM main storage area is transferred to the electric quantity buffer area;
and determining whether the data of the power-down backup data area need to be restored to the electric quantity related buffer area according to the CRC check of the power-down EEPROM, and recalculating the CRC.
4. A method of sensing a power outage in an electrical energy meter according to claim 1, claim 2 or claim 3, wherein the reporting of the power outage is performed after the power outage in the electrical energy meter.
5. The method for sensing power failure of an electric energy meter according to claim 4, wherein the specific steps of reporting the power failure are as follows:
(1) The node judges that the power failure occurs, randomly waits for time, randomly windows (n, m), and units: ms;
(2) When the waiting time expires, generating a power-off message and sending the power-off message;
(3) After the power-off message is sent, waiting for T seconds to perform data collection work, analyzing each time the power-off message is received in the waiting period, and updating the analysis result and the stored information union set into an updated result, wherein each sending time is expired and the updated result is used for generating the power-off message;
(4) Judging whether the waiting time T expires; if yes, judging whether the maximum transmission times N are reached, if not, returning to the step (1) to continue transmission, and if so, ending the collection;
(5) The uninterrupted power node reports a power failure sensing message to the CCO;
(6) 1, station power failure report: once a 1-hop station fails, the CCO directly processes its outage information, but the CCO does not acknowledge.
6. The method for sensing power failure of an electric energy meter according to claim 5, wherein the specific process of step (5) is as follows: and after the non-outage node receives the first frame of outage information message, the node starts to wait for a certain time, all the outage information received in the waiting period is analyzed and subjected to union operation, and after the waiting time expires, the final result is obtained to generate a message unicast and reported to the CCO.
7. The method of claim 5, wherein in step (2), a local broadcast mode is used to send a power-off message.
8. The power failure sensing system of the electric energy meter is characterized by comprising a front-stage detection unit and a rear-stage detection unit; the front-stage detection unit is used for detecting power failure of the front stage of the electric energy meter; if the power failure of the front stage of the electric energy meter is detected, controlling a relay unit corresponding to the electric energy meter to switch off and storing data; the post-stage detection unit is used for detecting power failure of the post-stage of the electric energy meter; if the power failure of the later stage of the electric energy meter is detected, the power failure sensing unit corresponding to the electric energy meter enters a dormant state; if the power failure of the rear stage of the electric energy meter is not detected, continuously performing power failure detection of the rear stage of the electric energy meter in a preset time, and if the power failure of the rear stage of the electric energy meter is not detected in the preset time, controlling a relay unit corresponding to the electric energy meter to be switched on; if the later stage of the electric energy meter is detected within the preset time, the power failure sensing unit enters a dormant state; the power-on detection unit is used for carrying out power-on detection on the rear stage of the electric energy meter after the power failure sensing unit enters the dormant state; and when the power-on of the later stage of the electric energy meter is detected, the relay unit is controlled to be switched on.
9. The power outage sensing system of the electric energy meter according to claim 8, wherein the front-stage detection unit comprises a rectifying voltage limiting circuit and a front-stage detection circuit, and the rectifying voltage limiting circuit comprises diodes D1-D3, a voltage stabilizing diode VD1, resistors R1, R3 and R4; the anodes of the diodes D1-D3 are respectively connected with the input ends of each phase of the electric energy meter, the cathodes of the diodes D1-D3 are respectively connected with one ends of the resistors R1, R3 and R4, the other ends of the resistors R1, R3 and R4 are connected with the cathode of the voltage-stabilizing diode VD1, and the anode of the voltage-stabilizing diode VD1 is connected with the input end of the front-stage detection circuit.
10. The power outage sensing system according to claim 9, wherein the pre-stage detection circuit comprises a power supply VDD, a triode Q1M, a resistor R50M, R51M, R M, a capacitor C51M, C M, a base electrode of the triode Q1M is connected with an anode of the zener diode VD1, one ends of the resistor R52M and the capacitor C53 are connected with a base electrode of the triode Q1M, the other ends of the resistor R52M and the capacitor C53 are connected with an emitter electrode of the triode Q1M and grounded, the power supply VDD is connected with a collector electrode of the triode Q1M through the resistor R51M, and the collector electrode of the triode Q1M is grounded through the resistor R50M and the capacitor C51M in sequence.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116707121A (en) * | 2023-08-10 | 2023-09-05 | 青岛鼎信通讯股份有限公司 | Electric energy meter clock nursing method, device and medium |
| CN116707121B (en) * | 2023-08-10 | 2023-11-14 | 青岛鼎信通讯股份有限公司 | Electric energy meter clock nursing method, device and medium |
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