CN109981140B - Power sensitivity test system of power carrier communication module - Google Patents
Power sensitivity test system of power carrier communication module Download PDFInfo
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- CN109981140B CN109981140B CN201910342700.1A CN201910342700A CN109981140B CN 109981140 B CN109981140 B CN 109981140B CN 201910342700 A CN201910342700 A CN 201910342700A CN 109981140 B CN109981140 B CN 109981140B
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- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 230000035945 sensitivity Effects 0.000 title claims abstract description 53
- 230000006854 communication Effects 0.000 title claims abstract description 44
- 238000004891 communication Methods 0.000 title claims abstract description 43
- 239000003990 capacitor Substances 0.000 claims description 42
- 101000579716 Homo sapiens Protein RFT1 homolog Proteins 0.000 claims description 8
- 101000713179 Papio hamadryas Solute carrier family 52, riboflavin transporter, member 2 Proteins 0.000 claims description 8
- 102100028269 Protein RFT1 homolog Human genes 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000002401 inhibitory effect Effects 0.000 claims description 4
- 101100094921 Caenorhabditis elegans rft-1 gene Proteins 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 230000006855 networking Effects 0.000 description 12
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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Abstract
The invention discloses a power line carrier communication module power sensitivity test system, which tests the power level transmitted between an electric energy meter and a concentrator; comprising the following steps: a filter, coupler, attenuator; the filter is an EMI power line filter respectively arranged on a power line of a mains supply entering electric energy meter and a mains supply entering concentrator; the power line connected between the electric energy meter and the concentrator is a shielding line; the coupler is arranged at the position where two ends of the shielding wire are respectively connected with the electric energy meter or the concentrator; the attenuator is an SMA type stepping coaxial attenuator arranged on the shielding wire. The system can optimize personnel arrangement, the test system can be reused, errors are not easy to occur, the test result can be directly observed, and labor is saved. And the power sensitivity performance of the ammeter module is verified. The structure is simpler, and the switching of the frequency bands can be realized by replacing the coupler.
Description
Technical Field
The invention relates to the field of power grid service, in particular to a power sensitivity test system of a power carrier communication module.
Background
Testing the communication performance of the power line carrier device can provide improved power and data support for enterprise production and development. The working principle is that the power line is used as a communication medium, and data is modulated into a fixed frequency signal in the power line and communicated through a fixed coupler. The method can be used for building laboratory environment and simulating field application conditions. The test module attenuates signals in natural environment to cause poor communication.
The power market is provided with a large number of remote data acquisition terminal (such as a concentrator, a distribution transformer, a negative control and the like) devices, and the installation and use span of the devices is large, and the devices are from the initial power narrow-band carrier communication to the current broadband carrier communication. Because of different test frequency bands, different test methods of broadband and narrowband and the change of test environments easily cause inaccurate measurement data. The traditional method is to observe the transmitting power and signal waveform of each module by using an oscilloscope and a frequency spectrograph, so that the efficiency is low and interference caused by a simulation environment cannot be eliminated.
In order to provide a production test conforming to the communication sensitivity of the narrow-band module of the national network and a production test conforming to the communication sensitivity of the broadband module, reduce the working hours of the loss of the test link, improve the test accuracy, and need to build a power line carrier communication module power sensitivity test system which can be switched between the broadband and the narrow-band and has the multi-path meter reading capability.
Disclosure of Invention
The invention aims to provide a power sensitivity test system of a power line carrier communication module.
The technical scheme adopted by the invention for realizing the technical purpose is that the power sensitivity test system of the power line carrier communication module tests the power level transmitted between the electric energy meter and the concentrator; comprising the following steps:
a filter, coupler, attenuator;
the filter is an EMI power line filter respectively arranged on a power line of a mains supply entering electric energy meter and a mains supply entering concentrator;
The power line connected between the electric energy meter and the concentrator is a shielding line;
the coupler is arranged at the position where two ends of the shielding wire are respectively connected with the electric energy meter or the concentrator;
the attenuator is an SMA type stepping coaxial attenuator arranged on the shielding wire.
The system can optimize personnel arrangement, the test system can be reused, errors are not easy to occur, the test result can be directly observed, and labor is saved. And the power sensitivity performance of the ammeter module is verified. The structure is simpler, and the switching of the frequency bands can be realized by replacing the coupler.
Further, in the power line carrier communication module power sensitivity test system, the power line carrier communication module comprises: the electric energy meter is a single-phase electric meter.
Further, in the power line carrier communication module power sensitivity test system, the power line carrier communication module comprises: and a relay protection switch is also arranged when the mains supply is connected.
Further, in the power line carrier communication module power sensitivity test system, the power line carrier communication module comprises: the coupler is a narrow-band carrier coupler and comprises a transformer RFT1, a filter for suppressing signals above 50HZ is arranged between the high-voltage end of the transformer RFT1 and an input phase line, and the low-voltage end of the transformer RFT1 is connected with a shielding wire through an SMA interface.
Further, in the power line carrier communication module power sensitivity test system, the power line carrier communication module comprises: the filter for inhibiting signals above 50HZ comprises resistors R11, R12 and R13, capacitors C11, C12, C13 and C14 and a single-pole double-throw switch SW11;
The resistor R13 is arranged between input phase lines, one ends of the resistors R11 and R12 and the capacitor C11 are connected with an L1 phase in the input phase line, the resistors R11 and R12 are connected with each other and one ends of the capacitors C12 and C13, the other ends of the capacitors C12 and C13 are connected with a No. 1 pin of the single-pole double-throw switch SW11, and a No. 2 pin and a No. 3 pin of the single-pole double-throw switch SW11 are respectively connected with two phases of the phase line; the other end of the capacitor C11 is connected with one end of the capacitor C14, and the other end of the capacitor C14 is connected with the N1 phase in the input phase line;
Two ends of the capacitor C4 are respectively connected with pins 1 and 2 of the transformer RFT 1.
Further, in the power line carrier communication module power sensitivity test system, the power line carrier communication module comprises: the coupler is a broadband carrier coupler and comprises a coupling transformer T1, the coupling transformer T1 is a three-winding transformer, the primary side of the coupling transformer T1 is protected by a piezoresistor RV1, a second filter for inhibiting 50HZ signals and low-frequency signals is arranged between the coupling transformer T1 and the primary side, a transient diode D1 is added to a group of secondary coils of the coupling transformer T1 for protecting the coupling transformer T, and then the coupling transformer T1 is connected with a shielding wire through an SMA interface.
Further, in the power line carrier communication module power sensitivity test system, the power line carrier communication module comprises: the second filter comprises resistors R1, R2, R3 and R4, capacitors C1, C2, C3 and C4 and a single-pole double-throw switch SW1;
one end of the resistor R1, the resistor R2 and the resistor R4 and one end of the capacitor C1 are connected with the L1 in the input phase line, the other ends of the resistor R1 and the resistor R2 are connected with one ends of the capacitor C2 and the capacitor C3, the other ends of the capacitor C2 and the capacitor C3 are connected with the No. 1 pin of the single-pole double-throw switch SW1, and the No.2 pin and the No. 3 pin of the single-pole double-throw switch SW1 are respectively connected with two phases of the phase line; the other ends of the resistor R4 and the capacitor C1 are respectively connected with the primary side anode of the coupling transformer T1, the primary side cathode of the coupling transformer T1 is connected with one ends of the capacitor C4 and the resistor R3, and the other ends of the capacitor C4 and the resistor R3 are connected with the N1 phase in the input phase line.
The invention will be further described with reference to the drawings and detailed description.
Drawings
FIG. 1 is a block diagram of a test system of the present invention.
Fig. 2 is a schematic diagram of a narrowband coupler for use with the present invention.
Fig. 3 is a schematic diagram of a wideband coupler for use with the present invention.
Detailed Description
Embodiment 1, as shown in fig. 1, is a system for detecting power sensitivity of a power line carrier communication module in an electric energy meter, in this embodiment, performance of the power line carrier communication module is tested by testing power level of the power line carrier communication module using power line carrier communication, which is set by the electric energy meter to implement automatic meter reading.
As shown in fig. 1, in order to make the test environment clean, an EMI power line filter is provided in the system to provide clean power for the electric energy meter and the concentrator, in this embodiment, the commercial power enters the test system after passing through the relay protection switch, in this embodiment, three-phase power is used to supply power, each phase is measured by using a single-phase ammeter, and then the carrier signal output by the carrier communication module is transmitted to the concentrator through the power line connected to the concentrator. As shown in fig. 1: the power line carrier communication module power sensitivity test system of the embodiment tests the power level transmitted between the electric energy meter and the concentrator; comprising the following steps:
a filter, coupler, attenuator;
In this embodiment, the filter is an EMI power line filter respectively disposed on the power lines of the mains entering electric energy meter and the mains entering concentrator; because three-phase power is adopted, after the relay protection switch, an EMI power line filter is adopted to filter the three-phase power, pure electric energy is provided for the concentrator and the ammeter, and before each single-phase ammeter is fed into the relay protection switch, another EMI power line filter is adopted to filter, each single-phase ammeter uses one EMI power line filter, and when the concentrator is powered, the EMI power line filter is also used to filter the relay protection switch again, so that the pure electric energy is provided for the ammeter and the concentrator, and interference is avoided. In this embodiment, the EMI power filter is used to isolate the interference of external signals to the experimental environment while preventing the mutual interference between the test units.
The power line connected between the electric energy meter and the concentrator is a shielding line; the coupler is arranged at the connection part of the two ends of the shielding wire and the electric energy meter or the concentrator respectively; the attenuator is an SMA type stepping coaxial attenuator arranged on the shielding wire.
Specifically, in this embodiment, the power line may represent the power level of the system by using the power line to test the power sensitivity of the carrier communication module (dbmV), and the power sensitivity of the module itself may be determined by changing the power level of the system. The basic principle is that the normal transmitting waveform is attenuated after passing through the coupler, so that the concentrator and the terminal can only receive the attenuated signal, if the terminal can be determined to accept and recognize, the power sensitivity performance of the module can be determined to be normal.
The test environment can adjust the signal level of the circuit in a 1dB step mode under the condition of not interrupting the circuit by using two groups of SMA step coaxial attenuators, can be used for adjusting the power level in the test system, and has the characteristics of small volume, high precision, stability, reliability and the like. The attenuation amount can be determined according to the user demand, and the system attenuation value can be adjusted.
The test environment provides a coupler replacement port, and a narrowband coupler or a wideband coupler can be freely selected. One test platform can theoretically carry tens of ammeter terminal modules, and can be reused after writing addresses into the concentrator. And the worker only needs to repeatedly insert a new module into the ammeter, and the data is returned to the receiving terminal after the concentrator automatically reads, so that the reading is successful.
As shown in fig. 1, in this embodiment, the main working devices include: the EMI filter, the coupler, the attenuator, the concentrator, the shielding wire and the electric energy meter are connected to the relay protection switch, and after the protection switch is closed, the EMI power wire filter can have a larger blocking effect on high-frequency interference signals, so that the interference of the outside on a communication channel is reduced. The concentrator is connected in parallel with the coupler through three-phase four wires of the MI power line filter. The coupler is divided into A, B and C which are respectively output by a phase of electric energy meter, the communication process is isolated and simulated, and the attenuation value of a communication channel can be selected by adding an attenuator. The coupler and the attenuator are connected by a shielding wire, so that external interference is reduced, and the surface of the attenuator is grounded to prevent signals from flowing to the coupler through the shell. After passing through the attenuator, a coupler of the same type is added. The electric energy meter is connected with the phase line and the zero line of the filter in parallel and then connected with the output end of the coupler. After the three-phase power of the commercial power is connected, the three-phase power is used as a main switch for supplying power to the system through a relay protection switch. The EMI power line filter can effectively isolate external high-frequency signal interference, the concentrator and the electric energy meter power line are connected with a clean power supply output by the filter, and the power supply is connected with a coupler, so that high-voltage side connection is completed. Through the coupler, the SMA stepping coaxial attenuator can be connected to the shielding wire after isolation, and the attenuator can select a value needing attenuation to provide a power sensitivity test.
The test platform mainly comprises two product tests for testing the power sensitivity of the electric energy meter module and the power sensitivity of the concentrator module. In the period:
the power sensitivity of the electric energy meter module is tested by adopting the following steps:
1. A set of concentrator modules and energy meter modules (hereinafter referred to as reference modules) passing the national grid test and a plurality of energy meter modules to be tested are prepared.
2. The reference module is placed in a test environment, and the attenuator is adjusted to obtain: maximum networking sensitivity, maximum receiving sensitivity, and maximum communication sensitivity. (the data is used herein as reference data for determining the performance of the module under test).
In this embodiment, the maximum networking sensitivity, the maximum receiving sensitivity, and the maximum communication sensitivity are respectively determined as follows:
Maximum sensitivity of networking: and after the attenuation value of the attenuator is adjusted to the maximum value, the power is supplied, and networking between the concentrator module and the electric energy meter module cannot be realized due to overlarge attenuation. At this time, the attenuation value of the attenuator is reduced, and the background message is observed. Gradually reducing the attenuation value until the concentrator module reports a successful message of the PC end networking, and recording the attenuation value at the moment, wherein the attenuation value is the maximum networking sensitivity.
The maximum receiving sensitivity testing method comprises the following steps: and after the networking between the modules is successful, the attenuation value of the attenuator is adjusted to the maximum value, and the concentrator module and the electric energy meter module are communicated due to overlarge attenuation. When the electric energy meter module is tested, the concentrator module is controlled to send a copy instruction to the electric energy meter module and gradually reduce the attenuation value of the attenuator. And the monitoring electric energy meter module is used for observing whether the module receives and processes the transcription instruction. When the electric energy meter module recognizes the instruction and sends a data message, recording the sensitivity at the moment as the maximum receiving sensitivity.
The maximum transmission sensitivity test method comprises the following steps: after the networking between the modules is successful, a spectrometer is connected between the two attenuators. When the electric energy meter module is tested, zeroing an attenuator in the direction of the electric energy meter module; the attenuator in the direction of the concentrator module is increased by 5-10 dBuV (the transmitting power of the electric energy meter can be effectively observed). The control concentrator module sends a total copy instruction, and when the electric energy meter module receives the total copy instruction, the control concentrator module sends a return instruction. The spectrometer was tuned to maintain maximum. And grabbing an image with stable waveform, and recording the sensitivity of the current frequency band.
3. And taking down the electric energy meter module in the reference module, and replacing the electric energy meter module to be tested for testing. The following steps are obtained: maximum networking sensitivity, maximum receiving sensitivity, and maximum communication sensitivity. And comparing the reference data with the user requirement, judging the acceptable sensitivity error range, and determining the performance of the test module. And comparing the result of the test module with the test result of the comparison module under the same environment. And judging that the sensitivity performance is normal when the error is more than or equal to 5. The rest modules are sent to the research and development process.
4. The method can utilize the networking function of the concentrator to realize the simultaneous test of a plurality of electric energy meters and improve the test efficiency.
The method for testing the power sensitivity of the concentrator module comprises the following steps:
1. A set of concentrator modules and electric energy meter modules (hereinafter referred to as reference modules) passing the national grid test and a plurality of concentrator modules to be tested are prepared.
2. The reference module is placed in a test environment, and the attenuator is adjusted to obtain: maximum networking sensitivity, maximum receiving sensitivity, and maximum communication sensitivity. (the data is used herein as reference data for determining the performance of the module under test).
3. And (5) taking down the concentrator module in the reference module, and replacing the concentrator module to be tested with the concentrator module to be tested for testing. The following steps are obtained: maximum networking sensitivity, maximum receiving sensitivity, and maximum communication sensitivity. And comparing the reference data with the user requirement, judging the acceptable sensitivity error range, and determining the performance of the test module.
In this embodiment, a narrowband coupler or a wideband coupler may be used.
The narrowband coupler is shown in fig. 2: the high-voltage end (primary side) of the transformer RFT1 is provided with a filter for inhibiting signals above 50HZ, and the low-voltage end (secondary side) of the transformer RFT1 is connected with a shielding wire through an SMA interface. The filter suppresses the 50HZ signal and the high frequency signal. The spectral curve can be swept out by a spectrometer.
According to the use requirement, the L1 welding spot can be selectively connected into any one of ABC three phases in the electric energy meter/concentrator, the N1 welding spot is connected into N phases in the electric energy meter/concentrator, and a transformer is used for isolating high voltage, so that a test operation part (attenuator) is in a low-voltage state, and the safety of a test environment is ensured. The SMA port is connected with the shielding wire.
The filter for suppressing signals above 50HZ comprises resistors R11, R12 and R13, capacitors C11, C12, C13 and C14 and a single-pole double-throw switch SW11; the resistor R13 is arranged between input phase lines, one ends of the resistors R11 and R12 and the capacitor C11 are connected with the L1 phase in the input phase line, the resistors R11 and R12 are connected with each other and one ends of the capacitors C12 and C13, the other ends of the capacitors C12 and C13 are connected with the No. 1 pin of the single-pole double-throw switch SW11, and the No. 2 pin and the No. 3 pin of the single-pole double-throw switch SW11 are respectively connected with two phases of the phase lines; the other end of the capacitor C11 is connected with one end of the capacitor C14, and the other end of the capacitor C14 is connected with the N1 phase in the input phase line; two ends of the capacitor C4 are respectively connected with pins 1 and 2 of the transformer RFT 1.
The broadband coupler used in this embodiment is shown in fig. 3: the coupling transformer adopts a three-winding transformer, a second filter is arranged at the high-voltage end (original end) of the transformer, and the second filter suppresses a 50HZ signal and a low-frequency signal. The spectral curve can be swept out by a spectrometer. And a piezoresistor RV1 is added to protect a high-voltage end circuit when the mains supply is supplied, and a transient diode D1 is added to protect a transformer.
According to the use requirement, the L welding spots can be selectively connected into any one of the A BC three phases in the electric energy meter/concentrator, the N welding spots are connected into the N phases in the electric energy meter/concentrator, and the transformer is used for isolating high voltage, so that the test operation part (attenuator) is in a low-voltage state, and the safety of the test environment is ensured. The SMA port is connected with the shielding wire.
The second filter comprises resistors R1, R2, R3, R4, capacitors C1, C2, C3, C4 and a single-pole double-throw switch SW1; one end of the resistor R1, the resistor R2 and the resistor R4 and one end of the capacitor C1 are connected with the L1 in the input phase line, the other ends of the resistor R1 and the resistor R2 are connected with one ends of the capacitor C2 and the capacitor C3, the other ends of the capacitor C2 and the capacitor C3 are connected with the No. 1 pin of the single-pole double-throw switch SW1, and the No. 2 pin and the No. 3 pin of the single-pole double-throw switch SW1 are respectively connected with two phases of the phase line; the other ends of the resistor R4 and the capacitor C1 are respectively connected with the primary side anode of the coupling transformer T1, the primary side cathode of the coupling transformer T1 is connected with one ends of the capacitor C4 and the resistor R3, and the other ends of the capacitor C4 and the resistor R3 are connected with the N1 phase in the input phase line.
Claims (1)
1. The power sensitivity test system of the power line carrier communication module tests the power level transmitted between the electric energy meter and the concentrator; the method is characterized in that: in a pure power environment, testing the power level of a power line carrier communication module which is arranged for realizing automatic meter reading by an electric energy meter and utilizes power line carrier communication; comprising the following steps: a filter, coupler, attenuator;
The filter is an EMI power line filter respectively arranged on a power line of a mains supply entering electric energy meter and a mains supply entering concentrator; the power line filter comprises an EMI power line filter arranged behind a relay protection switch, wherein the EMI power line filter filters three-phase electricity, and the EMI power line filter is respectively used when entering each single-phase electric energy meter and when entering a concentrator;
The power line connected between the electric energy meter and the concentrator is a shielding line; the coupler is arranged at the position where two ends of the shielding wire are respectively connected with the electric energy meter or the concentrator; the attenuator is an SMA type stepping coaxial attenuator arranged on the shielding wire;
The coupler is a narrow-band carrier coupler and comprises a transformer RFT1, a filter for suppressing signals above 50HZ is arranged between the high-voltage end of the transformer RFT1 and an input phase line, and the low-voltage end of the transformer RFT1 is connected with a shielding wire through an SMA interface;
The filter for inhibiting signals above 50HZ comprises resistors R11, R12 and R13, capacitors C11, C12, C13 and C14 and a single-pole double-throw switch SW11; the resistor R13 is arranged between input phase lines, one ends of the resistors R11 and R12 and the capacitor C11 are connected with L1 in the input phase lines, the resistors R11 and R12 are connected with each other and one ends of the capacitors C12 and C13, the other ends of the capacitors C12 and C13 are connected with a pin 1 of the single-pole double-throw switch SW11, and pins 2 and 3 of the single-pole double-throw switch SW11 are respectively connected with two phases of the phase lines; the other end of the capacitor C11 is connected with one end of the capacitor C14, and the other end of the capacitor C14 is connected with the N1 phase in the input phase line; two ends of the capacitor C4 are respectively connected with pins 1 and 2 of the transformer RFT 1.
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| CN110299953B (en) * | 2019-08-05 | 2022-01-25 | 国网重庆市电力公司电力科学研究院 | Electric energy meter connection sensitivity test system and method |
| CN112713914B (en) * | 2020-12-31 | 2022-09-02 | 深圳市九洲电器有限公司 | Test system of power line carrier communication equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202340226U (en) * | 2011-06-30 | 2012-07-18 | 珠海中慧微电子有限公司 | Fully automatic test device for performance indexes of power line carrier communication |
| CN202524395U (en) * | 2011-11-02 | 2012-11-07 | 华北电网有限公司计量中心 | General test platform for low-voltage carrier automatic meter reading system |
| CN103346846A (en) * | 2013-06-21 | 2013-10-09 | 国家电网公司 | Communication channel stimulation system of electricity consumption information collection system |
| CN108631819A (en) * | 2017-03-15 | 2018-10-09 | 国网四川省电力公司电力科学研究院 | Power line carrier noise jamming tests system and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9276638B2 (en) * | 2010-09-22 | 2016-03-01 | Texas Instruments Incorporated | Coupling circuits for power line communication devices |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202340226U (en) * | 2011-06-30 | 2012-07-18 | 珠海中慧微电子有限公司 | Fully automatic test device for performance indexes of power line carrier communication |
| CN202524395U (en) * | 2011-11-02 | 2012-11-07 | 华北电网有限公司计量中心 | General test platform for low-voltage carrier automatic meter reading system |
| CN103346846A (en) * | 2013-06-21 | 2013-10-09 | 国家电网公司 | Communication channel stimulation system of electricity consumption information collection system |
| CN108631819A (en) * | 2017-03-15 | 2018-10-09 | 国网四川省电力公司电力科学研究院 | Power line carrier noise jamming tests system and test method |
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