CN106645931A - Current transformer secondary circuit monitoring module and method, and specific transformer acquiring terminal - Google Patents
Current transformer secondary circuit monitoring module and method, and specific transformer acquiring terminal Download PDFInfo
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- CN106645931A CN106645931A CN201611073498.XA CN201611073498A CN106645931A CN 106645931 A CN106645931 A CN 106645931A CN 201611073498 A CN201611073498 A CN 201611073498A CN 106645931 A CN106645931 A CN 106645931A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R22/061—Details of electronic electricity meters
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
Abstract
The invention discloses a current transformer secondary circuit monitoring module and method, and a specific transformer acquiring terminal. The monitoring module comprises: a first communication unit which communicates with a second communication unit in the specific transformer acquisition terminal; a current detection unit which detects the load current of the current transformer secondary circuit; a signal applying unit which applies a high-frequency voltage signal to the current transformer secondary circuit; a resonant unit which resonates when the high-frequency voltage signal is applied to the current transformer secondary circuit; an inverter which constitutes a self-excited oscillation circuit with the resonant unit; a micro-control unit which realizes data acquisition, flow control and signal control. The current transformer secondary circuit monitoring module and method, and the specific transformer acquiring terminal, based on the impedance characteristic of the current transformer secondary circuit, realize the normal connection, open circuit, and short circuit of the current transformer secondary circuit, and the state monitoring of a short-circuit electric energy meter.
Description
Technical field
The present invention relates to Electric Energy Metering Technology field, and in particular to a kind of secondary loop of mutual inductor monitoring modular and side
Method, special transformer acquisition terminal.
Background technology
Stealing refer to illegally occupy electric energy, do not measure for the purpose of not handing over and either pay tariff less, using illegal means or
The behavior of electricity consumption is measured less.Electric energy metered system mainly includes three parts：Transformer, secondary circuit and electric energy meter, wherein,
Electric energy meter had become basically universal in the last few years as intelligent electric meter, and it has strong magnetic disturbance, power-off event, the functions such as monitoring of uncapping, tool
There is anti-electricity-theft function；Easily there is the risk of security incident due to there is high pressure in transformer, the possibility of stealing is less；Secondary returning
Road is in low-pressure side, and its connection status directly can not be monitored by electric energy meter, has become electricity filching person and has been easiest to what is changed
Link.
It can be seen from the expression formula of electric energy metrical, as long as any one parameter in voltage, electric current and power factor
Reduce, power can be reduced, reduce electricity.And in a practical situation, due to voltage varying less with load, using people
For mode reduce voltage and be easy to be found, can be found according to the change of power factor again by changing power factor.Only
There is reduction electric current to be an exception, because electric current is not stop what is changed with the power load change of user, can be from zero change
To maximum, thus it is difficult to judge measured object whether in stealing by the situation of change of electric current.Using change electric current
In carrying out the gimmick of stealing, and it is most difficult to be sent out with the shunting stealing electricity method for directly carrying out secondary loop of mutual inductor short circuit
It is existing, and it is maximum to account for the ratio of various electricity filching behaviors.Although the product of many anti-shunting stealings existing in the market, due to
The reason for product itself, using not extensive.
The content of the invention
The technical problem to be solved is to provide a kind of secondary loop of mutual inductor monitoring modular and method, specially
Become acquisition terminal, based on the impedance operator of transformer secondary circuit, realize the normal connection of secondary loop of mutual inductor, open
The status monitoring on road, short circuit and short circuit electric energy meter.
The present invention is achieved through the following technical solutions：
A kind of secondary loop of mutual inductor monitoring modular, including the first communication unit, micro-control unit, current detecting list
Unit, signal applying unit, resonant element and phase inverter；First communication unit is connected with the micro-control unit, is used for
Communicated with the second communication unit in special transformer acquisition terminal；The current detecting unit is connected with the micro-control unit,
For detecting the load current of secondary loop of mutual inductor；The signal applying unit is connected with the micro-control unit, uses
In to secondary loop of mutual inductor injection high-frequency voltage signal, the frequency of the high-frequency voltage signal and the resonant element
Resonant frequency is identical；The resonant element is connected with the micro-control unit, for high in secondary loop of mutual inductor injection
There is resonance during frequency voltage signal；The phase inverter is connected with the resonant element, for constituting self-excitation with the resonant element
Oscillating circuit；The micro-control unit is used to realize the control of data acquisition, Row control and signal.
Optionally, the current detecting unit includes the first current transformer and sampling resistor；First Current Mutual Inductance
The primary coil of device be the circle punching of secondary loop of mutual inductor wire one, the one of the secondary coil of first current transformer
One end of the end connection sampling resistor and the micro-control unit, the other end of the secondary coil of first current transformer
Connect the other end of the sampling resistor and be grounded.
Optionally, the signal applying unit includes voltage transformer and drive circuit；The primary of the voltage transformer
Coil is the circle punching of secondary loop of mutual inductor wire one, and one end of the secondary coil of the voltage transformer connects the drive
The output end of dynamic circuit, the other end ground connection of the secondary coil of the voltage transformer, the input connection of the drive circuit
The micro-control unit.
Optionally, the resonant element includes the second current transformer, the first electric capacity and the second electric capacity；Second electric current
The primary coil of transformer be the circle punching of secondary loop of mutual inductor wire one, the secondary coil of second current transformer
One end connect one end of first electric capacity and the micro-control unit, the secondary coil of second current transformer it is another
One end connects the other end ground connection of one end of second electric capacity, the other end of first electric capacity and second electric capacity.
Optionally, the output end of the phase inverter connects one end of first electric capacity, and the input of the phase inverter connects
Connect one end of second electric capacity.
Optionally, the secondary loop of mutual inductor monitoring modular also includes safe unit；The safe unit and institute
Micro-control unit and first communication unit connection are stated, for the in first communication unit and transformation acquisition terminal
Communication between two communication units carries out authentication and information security encryption.
Optionally, the safe unit is embedded safe control module.
Optionally, the secondary loop of mutual inductor monitoring modular also includes power subsystem；The power subsystem is used for
The Power convert that special transformer acquisition terminal is provided is the power supply of secondary loop of mutual inductor monitoring modular.
Based on above-mentioned secondary loop of mutual inductor monitoring modular, the present invention also provides a kind of secondary loop of mutual inductor
Monitoring method, including：
The current detecting unit detects the load current of secondary loop of mutual inductor；
Whether the micro-control unit judges the load current of secondary loop of mutual inductor less than predetermined current threshold；
If the load current of secondary loop of mutual inductor is not less than predetermined current threshold, start the self-oscillation electricity
Road, the micro-control unit determines Current Transformer Secondary when the minimum frequency of the self-maintained circuit does not change
Loop works are normal；
If the load current of secondary loop of mutual inductor is less than predetermined current threshold, the signal applying unit is to electric current
Transformer secondary circuit injects high-frequency voltage signal, and the micro-control unit is not higher than pre- in the amplitude of the oscillator signal for detecting
If during voltage threshold, determining that secondary loop of mutual inductor is working properly.
Based on above-mentioned secondary loop of mutual inductor monitoring modular, the present invention also provides a kind of special transformer acquisition terminal, including
Second communication unit and above-mentioned secondary loop of mutual inductor monitoring modular, second communication unit is used for logical with described first
Letter unit is communicated.
The present invention compared with prior art, has the following advantages and advantages：
Secondary loop of mutual inductor monitoring modular and method that the present invention is provided, the impedance based on transformer secondary circuit
Characteristic, detects first the load current size of secondary loop of mutual inductor, and according to load current size Current Mutual Inductance is can determine whether
Device secondary circuit is in normally/short-circuit condition in open circuit/normal low load condition；By detecting self-maintained circuit
Minimum frequency, determines whether that secondary loop of mutual inductor is to be in short-circuit condition in normal condition；By humorous
Whether high-frequency signal is detected during cell operation of shaking, determine whether secondary loop of mutual inductor in open-circuit condition or work
Make state；By the amplitude size for detecting resonant element oscillator signal, further judge that secondary loop of mutual inductor is in
Short-circuit condition or normal condition.By above-mentioned detection, the connection status of secondary loop of mutual inductor can be accurately identified, be to steal
Pyroelectric monitor provides authentic data.Further, the secondary loop of mutual inductor monitoring modular that the present invention is provided can be directly mounted at
Inside special transformer acquisition terminal, replace the current transformer in special transformer acquisition terminal, without the need for carrying out to electric energy metered system
Many transformations, it is thus possible to carry out large-scale popularization and application.
Description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of the secondary loop of mutual inductor monitoring modular of the embodiment of the present invention；
Fig. 2 is the schematic flow sheet of the secondary loop of mutual inductor monitoring method of the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and the exemplary embodiment of the present invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
Fig. 1 is the structural representation of the secondary loop of mutual inductor monitoring modular of the present embodiment, wherein, CT0 is metering
Current Transformer.The primary side of current transformer for metering CT0 is connected with power frequency supply, current transformer for metering CT0's
Secondary side connects and composes secondary loop of mutual inductor with electric energy meter current sample circuit 10.The secondary loop of mutual inductor
Monitoring modular includes the first communication unit 11, micro-control unit 12, current detecting unit 15, signal applying unit 16, resonance list
Unit 17 and phase inverter INV.
Specifically, first communication unit 11 is connected with the micro-control unit 12, in the micro-control unit 12
Under control, communicated with the second communication unit in special transformer acquisition terminal.In the present embodiment, first communication unit 11
Using the MAX485 integrated circuits of Maxim companies.
The current detecting unit 15 is connected with the micro-control unit 12, under the control of the micro-control unit 12,
The load current of detection secondary loop of mutual inductor.Further, the current detecting unit 15 includes the first current transformer
CT1 and sampling resistor R1.The primary coil of first Current Transmit 1 is worn for the circle of secondary loop of mutual inductor wire one
The heart, one end of the secondary coil of first Current Transmit 1 connects one end of the sampling resistor R1 and the microcontroller
Unit 12, the other end of the secondary coil of first Current Transmit 1 connects the other end of the sampling resistor R1 and connects
Ground.During the load current of detection secondary loop of mutual inductor, first Current Transmit 1 is returned to Current Transformer Secondary
The load current on road is sensed, and the sampling resistor R1 is converted in the electric current that first Current Transmit 1 is sensed
Corresponding voltage, and the voltage is changed by the analog-digital converter that the micro-control unit 12 is internally integrated.
The signal applying unit 16 is connected with the micro-control unit 12, under the control of the micro-control unit 12,
High-frequency voltage signal is injected to secondary loop of mutual inductor, the frequency of the high-frequency voltage signal is humorous with the resonant element
Vibration frequency is identical.Further, the signal applying unit 16 includes voltage transformer pt and drive circuit 14.The mutual induction of voltage
The primary coil of device PT be the circle punching of secondary loop of mutual inductor wire one, the one of the secondary coil of the voltage transformer pt
The output end of the end connection drive circuit 14, the other end ground connection of the secondary coil of the voltage transformer pt, the driving
The input of circuit 14 connects the micro-control unit 12.When injecting high-frequency voltage signal to secondary loop of mutual inductor, by
The micro-control unit 12 produces the control signal of required frequency, and 14 pairs of control signals of the drive circuit are driven amplification
High-frequency voltage signal is obtained, by the sensing of the voltage transformer pt, the high-frequency voltage signal is injected into current transformer
In secondary circuit.
The resonant element 17 is connected with the micro-control unit 12, for injecting high frequency in secondary loop of mutual inductor
There is resonance during voltage signal.Further, the resonant element 17 includes the second Current Transmit 2, the first electric capacity C1 and the
Two electric capacity C2.The primary coil of second Current Transmit 2 is the circle punching of secondary loop of mutual inductor wire one, described
One end of the secondary coil of the second Current Transmit 2 connects one end of the first electric capacity C1 and the micro-control unit 12,
The other end of the secondary coil of second Current Transmit 2 connects one end of the second electric capacity C2, first electric capacity
The other end ground connection of the other end of C1 and the second electric capacity C2.High-frequency voltage signal is injected in secondary loop of mutual inductor
When, due to inject high-frequency voltage signal frequency it is identical with the resonant frequency of the resonant element 17, the resonant element 17
Resonant condition is presented, the high-frequency voltage signal amplifies acquisition oscillator signal by resonance, and the amplitude of the oscillator signal is by described micro-
Control unit 12 is gathered.The phase inverter INV is connected with the resonant element 17, for constituting self-excitation with the resonant element 17
Oscillating circuit.The output end of the phase inverter INV connects one end of the first electric capacity C1, the input of the phase inverter INV
Connect one end of the second electric capacity C2.
The micro-control unit 12 is used to realize the control of data acquisition, Row control and signal.Further, the micro-control
Unit processed 12 works for controlling first communication unit 11, for providing required frequency to the signal applying unit 16
Control signal, for gather the current detecting unit 15 detection secondary loop of mutual inductor load current, it is described from
There is oscillator signal during resonance in excited oscillation circuit minimum frequency and the resonant element 17, and at the data to collection
Reason.In the present embodiment, the micro-control unit 12 is using the ST Microelectronics for being internally integrated analog-digital converter
STM32F103 integrated circuits.
In the present embodiment, the secondary loop of mutual inductor monitoring modular also includes safe unit 13.The safety
Unit 13 is connected with the micro-control unit 12 and first communication unit 11, under the control of the micro-control unit 12,
Authentication and letter are carried out to the communication between first communication unit 11 and the second communication unit in special transformer acquisition terminal
Breath safety encryption.In the present embodiment, the safe unit 13 unifies the embedded peace that distribution is used using State Grid Corporation of China
Full control module (ESAM, Embedded Secure Access Module).
It should be noted that the secondary loop of mutual inductor monitoring modular of the present embodiment can also may be used by externally fed
To be powered by special transformer acquisition terminal.In the present embodiment, the secondary loop of mutual inductor monitoring modular also includes power supply list
Unit, the Power convert that the power subsystem is used to provide special transformer acquisition terminal is secondary loop of mutual inductor monitoring modular
Power supply.
Based on above-mentioned secondary loop of mutual inductor monitoring modular, the present embodiment also provides a kind of Current Transformer Secondary and returns
Road monitoring method.Fig. 2 is the schematic flow sheet of the secondary loop of mutual inductor monitoring method of the present embodiment, including：
Step S1, the current detecting unit 15 detects the load current of secondary loop of mutual inductor.Specifically, electric current
When transformer secondary circuit works, first Current Transmit 1 is carried out to the load current of secondary loop of mutual inductor
The electric current that first Current Transmit 1 is sensed is converted to corresponding voltage by sensing, the sampling resistor R1, and by institute
State the analog-digital converter that micro-control unit 12 is internally integrated to change the voltage.
Whether step S2, the micro-control unit 12 judges the load current of secondary loop of mutual inductor less than default electricity
Stream threshold value.The predetermined current threshold is stored in advance in the micro-control unit 12, and it arranges less, and monitoring result is more accurate
Really, it is but higher to the operating accuracy requirement of each circuit components.The predetermined current threshold can be set according to the actual requirements
Put, in the present embodiment, the predetermined current threshold is set to one of percentage of power current.
If the load current of secondary loop of mutual inductor is not less than predetermined current threshold, execution step S31～S34.
Step S31, starts the self-maintained circuit.Specifically, the working power of the phase inverter INV is opened.
Step S32, the micro-control unit 12 judges whether the minimum frequency of the self-maintained circuit changes.Tool
Body ground, by second Current Transmit 2, the first electric capacity C1, the second electric capacity C2 and the phase inverter INV structures
Into self-maintained circuit, it is frequency of oscillation and the secondary inductance amount of second Current Transmit 2, described first electric
The capacitance of appearance C1 and the capacitance of the second electric capacity C2 are relevant, and the secondary coil of second Current Transmit 2
Inductance value it is again relevant with the amplitude of power current.When power current amplitude is raised, due to second Current Transmit 2
Core material enter saturation state, the secondary inductance amount of second Current Transmit 2 can be reduced, self-oscillation
The frequency of oscillation of circuit can increase as power current amplitude is raised.Therefore, the frequency of oscillation of self-maintained circuit is with work
The change of frequency electric current is presented periodically increase and reduces.At power current zero crossing, second Current Transmit 2
Secondary inductance amount is maximum, and the frequency of oscillation of self-maintained circuit is minimum.When secondary loop of mutual inductor is shorted,
The minimum oscillation frequency of self-maintained circuit can be raised, therefore, whether the minimum frequency of self-maintained circuit changes can conduct
The basis for estimation whether secondary loop of mutual inductor is shorted.
If the minimum frequency of the self-maintained circuit changes, execution step S33, determine that Current Transformer Secondary is returned
There is magnetic saturation in short out road, the short circuit of current transformer primary circuit or current transformer for metering.If the self-oscillation electricity
The minimum frequency on road does not change, execution step S34, determines that secondary loop of mutual inductor is working properly.
If the load current of secondary loop of mutual inductor is less than predetermined current threshold, execution step S41～S46.
Step S41, the signal applying unit 16 to secondary loop of mutual inductor injects high-frequency voltage signal.Specifically
Ground, by the micro-control unit 12 control signal of required frequency is produced, and 14 pairs of control signals of the drive circuit are driven
Dynamic amplification obtains high-frequency voltage signal, and by the sensing of the voltage transformer pt, the high-frequency voltage signal is injected into electric current
In transformer secondary circuit.
Step S42, the micro-control unit 12 judges whether to detect oscillator signal from the resonant element.Specifically,
When secondary loop of mutual inductor injects high-frequency voltage signal, due to the frequency and the resonance of the high-frequency voltage signal of injection
The resonant frequency of unit 17 is identical, if open circuit of secondary loop of current transformer is opened a way, the resonant element 17 will be presented
Resonant condition, the high-frequency voltage signal amplifies acquisition oscillator signal by resonance, and the amplitude of the oscillator signal is by the microcontroller
Unit 12 is gathered.
If not detecting oscillator signal from the resonant element 17, execution step S43 determines secondary loop of mutual inductor
Open circuit.If detecting oscillator signal, execution step S44～S46 from the resonant element 17.
Whether step S44, the micro-control unit 12 judges the amplitude of oscillator signal higher than predetermined voltage threshold.Specifically
Ground, the predetermined voltage threshold according to secondary loop of mutual inductor when normal the amplitude of the oscillator signal be configured and in advance
In being first stored in the micro-control unit 12.
If the amplitude of oscillator signal is higher than predetermined voltage threshold, execution step S45 determines that secondary loop of mutual inductor is short
Road.If the amplitude of oscillator signal is not higher than predetermined voltage threshold, execution step S46 determines that secondary loop of mutual inductor works
Normally.
It should be noted that the micro-control unit 12 most at last above-mentioned monitoring result pass through first communication unit 11
The second communication unit in special transformer acquisition terminal is reported to, data is provided for situ metrology overhaul of the equipments, power utility check and is supported, it is auxiliary
Inspection personnel is helped to judge whether electricity filching behavior.
The secondary loop of mutual inductor monitoring modular that the present embodiment is provided can be used as single module, it is also possible to straight
Connect and be installed on inside special transformer acquisition terminal, replace the current transformer in special transformer acquisition terminal.Based on this, the present embodiment is also provided
A kind of special transformer acquisition terminal, the special transformer acquisition terminal includes that the second communication unit and above-mentioned secondary loop of mutual inductor are monitored
Module, second communication unit is used to be communicated with first communication unit, for receiving the current transformer two
Minor loop monitors the monitoring result of mould.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of secondary loop of mutual inductor monitoring modular, it is characterised in that including the first communication unit, micro-control unit,
Current detecting unit, signal applying unit, resonant element and phase inverter；
First communication unit is connected with the micro-control unit, for entering with the second communication unit in special transformer acquisition terminal
Row communication；
The current detecting unit is connected with the micro-control unit, for detecting the load electricity of secondary loop of mutual inductor
Stream；
The signal applying unit is connected with the micro-control unit, for injecting high frequency voltage to secondary loop of mutual inductor
Signal, the frequency of the high-frequency voltage signal is identical with the resonant frequency of the resonant element；
The resonant element is connected with the micro-control unit, for injecting high-frequency voltage signal in secondary loop of mutual inductor
Shi Fasheng resonance；
The phase inverter is connected with the resonant element, for constituting self-maintained circuit with the resonant element；
The micro-control unit is used to realize the control of data acquisition, Row control and signal.
2. secondary loop of mutual inductor monitoring modular according to claim 1, it is characterised in that the current detecting list
Unit includes the first current transformer and sampling resistor；
The primary coil of first current transformer be the circle punching of secondary loop of mutual inductor wire one, first electric current
One end of the secondary coil of transformer connects one end of the sampling resistor and the micro-control unit, first Current Mutual Inductance
The other end of the secondary coil of device connects the other end of the sampling resistor and is grounded.
3. secondary loop of mutual inductor monitoring modular according to claim 1, it is characterised in that the signal applies single
Unit includes voltage transformer and drive circuit；
The primary coil of the voltage transformer is the circle punching of secondary loop of mutual inductor wire one, the voltage transformer
One end of secondary coil connects the output end of the drive circuit, and the other end of the secondary coil of the voltage transformer is grounded,
The input of the drive circuit connects the micro-control unit.
4. secondary loop of mutual inductor monitoring modular according to claim 1, it is characterised in that the resonant element bag
Include the second current transformer, the first electric capacity and the second electric capacity；
The primary coil of second current transformer be the circle punching of secondary loop of mutual inductor wire one, second electric current
One end of the secondary coil of transformer connects one end of first electric capacity and the micro-control unit, second Current Mutual Inductance
The other end of the secondary coil of device connects one end of second electric capacity, the other end of first electric capacity and second electric capacity
The other end ground connection.
5. secondary loop of mutual inductor monitoring modular according to claim 4, it is characterised in that the phase inverter it is defeated
Go out one end of end connection first electric capacity, the input of the phase inverter connects one end of second electric capacity.
6. secondary loop of mutual inductor monitoring modular according to claim 1, it is characterised in that also including safe list
Unit；
The safe unit is connected with the micro-control unit and first communication unit, for first communication unit
Authentication and information security encryption are carried out with the communication between the second communication unit in special transformer acquisition terminal.
7. secondary loop of mutual inductor monitoring modular according to claim 6, it is characterised in that the safe unit is
Embedded safe control module.
8. the secondary loop of mutual inductor monitoring modular according to any one of claim 1 to 7, it is characterised in that also wrap
Include power subsystem；
The Power convert that the power subsystem is used to provide special transformer acquisition terminal is secondary loop of mutual inductor monitoring modular
Power supply.
9. the secondary loop of mutual inductor monitoring module monitors Current Mutual Inductance described in a kind of any one of employing claim 1 to 8
The method of device secondary circuit, it is characterised in that include：
The current detecting unit detects the load current of secondary loop of mutual inductor；
Whether the micro-control unit judges the load current of secondary loop of mutual inductor less than predetermined current threshold；
If the load current of secondary loop of mutual inductor is not less than predetermined current threshold, start the self-maintained circuit, institute
Micro-control unit is stated when the minimum frequency of the self-maintained circuit does not change, secondary loop of mutual inductor work is determined
Make normal；
If the load current of secondary loop of mutual inductor is less than predetermined current threshold, the signal applying unit is to Current Mutual Inductance
Device secondary circuit injects high-frequency voltage signal, amplitude not higher than default electricity of the micro-control unit in the oscillator signal for detecting
During pressure threshold value, determine that secondary loop of mutual inductor is working properly.
10. a kind of special transformer acquisition terminal, it is characterised in that including described in the second communication unit and any one of claim 1 to 8
Secondary loop of mutual inductor monitoring modular, second communication unit is used to be communicated with first communication unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611073498.XA CN106645931A (en) | 2016-11-29 | 2016-11-29 | Current transformer secondary circuit monitoring module and method, and specific transformer acquiring terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611073498.XA CN106645931A (en) | 2016-11-29 | 2016-11-29 | Current transformer secondary circuit monitoring module and method, and specific transformer acquiring terminal |
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| CN108120947A (en) * | 2018-01-22 | 2018-06-05 | 宁波三星医疗电气股份有限公司 | CT secondary circuit power theft monitoring methods based on frequency-selecting |
| CN108362922A (en) * | 2018-01-23 | 2018-08-03 | 宁波三星医疗电气股份有限公司 | CT secondary circuit power theft monitoring methods based on genetic algorithm frequency-selecting |
| CN108710098A (en) * | 2018-05-18 | 2018-10-26 | 深圳供电局有限公司 | A kind of secondary loop of mutual inductor load detection method |
| CN108957140A (en) * | 2018-07-02 | 2018-12-07 | 中国电力科学研究院有限公司 | A kind of impedance measurement circuit system and method for wide dynamic range |
| CN108981975A (en) * | 2018-05-23 | 2018-12-11 | 北京航空航天大学 | A kind of pressure sensor and distribution force measuring method |
| CN109100603A (en) * | 2018-09-30 | 2018-12-28 | 中国电力科学研究院有限公司 | The detection device and method of secondary loop of mutual inductor short circuit |
| CN109765517A (en) * | 2019-01-02 | 2019-05-17 | 钜泉光电科技(上海)股份有限公司 | On-line checking circuit, method and the electric energy computation chip of current sensor parameter |
| CN109782213A (en) * | 2018-12-21 | 2019-05-21 | 国网山西省电力公司长治供电公司 | Fault finding system and method based on secondary circuit characteristic quantity |
| CN110632448A (en) * | 2019-09-16 | 2019-12-31 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
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| CN111375538A (en) * | 2018-12-29 | 2020-07-07 | 重庆西山科技股份有限公司 | Frequency control circuit and ultrasonic transducer system |
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| CN112485581A (en) * | 2020-10-19 | 2021-03-12 | 广东电网有限责任公司中山供电局 | Zero sequence current transformer and secondary circuit detection device and method thereof |
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| CN108362922B (en) * | 2018-01-23 | 2020-09-11 | 宁波三星医疗电气股份有限公司 | CT secondary circuit electricity stealing monitoring method based on genetic algorithm frequency selection |
| CN108710098A (en) * | 2018-05-18 | 2018-10-26 | 深圳供电局有限公司 | A kind of secondary loop of mutual inductor load detection method |
| CN108710098B (en) * | 2018-05-18 | 2021-02-19 | 深圳供电局有限公司 | Current transformer secondary circuit load detection method |
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| CN109100603A (en) * | 2018-09-30 | 2018-12-28 | 中国电力科学研究院有限公司 | The detection device and method of secondary loop of mutual inductor short circuit |
| CN109782213A (en) * | 2018-12-21 | 2019-05-21 | 国网山西省电力公司长治供电公司 | Fault finding system and method based on secondary circuit characteristic quantity |
| CN111375538A (en) * | 2018-12-29 | 2020-07-07 | 重庆西山科技股份有限公司 | Frequency control circuit and ultrasonic transducer system |
| CN111375538B (en) * | 2018-12-29 | 2021-08-03 | 重庆西山科技股份有限公司 | Frequency control circuit and ultrasonic transducer system |
| CN109765517A (en) * | 2019-01-02 | 2019-05-17 | 钜泉光电科技(上海)股份有限公司 | On-line checking circuit, method and the electric energy computation chip of current sensor parameter |
| CN110632448A (en) * | 2019-09-16 | 2019-12-31 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN110632448B (en) * | 2019-09-16 | 2022-07-15 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN110736916A (en) * | 2019-10-29 | 2020-01-31 | 宁波三星医疗电气股份有限公司 | State recognition method and device, electronic equipment and computer readable storage medium |
| CN110850334A (en) * | 2019-11-28 | 2020-02-28 | 国网福建省电力有限公司龙岩供电公司 | Nondestructive testing method and device for CT secondary circuit state |
| CN110850334B (en) * | 2019-11-28 | 2022-03-29 | 国网福建省电力有限公司龙岩供电公司 | Nondestructive testing method and device for CT secondary circuit state |
| CN112285618A (en) * | 2019-12-20 | 2021-01-29 | 青岛鼎信通讯股份有限公司 | Scheme for detecting CT secondary side wiring state |
| CN112415460A (en) * | 2020-09-07 | 2021-02-26 | 青岛鼎信通讯股份有限公司 | Current transformer fault self-diagnosis system and method |
| CN112485581A (en) * | 2020-10-19 | 2021-03-12 | 广东电网有限责任公司中山供电局 | Zero sequence current transformer and secondary circuit detection device and method thereof |
| CN113125838A (en) * | 2021-04-21 | 2021-07-16 | 广东电网有限责任公司计量中心 | Current monitoring system |
| CN114217124A (en) * | 2021-11-09 | 2022-03-22 | 河南九域腾龙信息工程有限公司 | Fusion terminal with loop inspection function |
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Application publication date: 20170510 |