CN202395424U - Digital instrument device of power transformer - Google Patents
Digital instrument device of power transformer Download PDFInfo
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- CN202395424U CN202395424U CN2011205054226U CN201120505422U CN202395424U CN 202395424 U CN202395424 U CN 202395424U CN 2011205054226 U CN2011205054226 U CN 2011205054226U CN 201120505422 U CN201120505422 U CN 201120505422U CN 202395424 U CN202395424 U CN 202395424U
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Abstract
The utility model relates to the technical field of power transformer monitor, and discloses a digital instrument device of a power transformer. The digital instrument device comprises a signal collecting and sampling circuit, an analog-digital conversion circuit, a microprocessor circuit, a driving circuit, a memory circuit, and a display alarm circuit, wherein the signal collecting and sampling circuit transmits a digital signal to the microprocessor circuit through the analog-digital conversion circuit; the digital signal processed by the microprocessor circuit is transmitted to the driving circuit, the memory circuit, an execution mechanism and the display alarm circuit; and the memory circuit is provided with a backup battery. The digital instrument device provided by the utility model can comprehensively protect the power transformer and display related data of the power transformer to prevent major safety accidents caused by temperature overload, phase failure and serious imbalance of three-phase voltage of the transformer. The digital instrument device provided by the utility model is simple in structure, low in cost, simple in installation and convenient in meter reading.
Description
Technical field
The utility model relates to power transformer monitoring technique field, relates in particular to a kind of power transformer digital instrument device.
Background technology
At present, the existing power transformer burnout failure occurs easily owing to lack reliable protective measure such as the primary and secondary phase failure, overvoltage, overload, the serious imbalance of three-phase voltage in the use.And the monitoring device of power transformer generally uses pointer-type, and the instrument distribution position is different, is not suitable for the monitor to open-air power transformer remote monitor.
Summary of the invention
For overcoming the deficiency of prior art; The utility model provides a kind of power transformer digital instrument device; Can protect the primary and secondary phase failure of power transformer, overvoltage, overload, the serious imbalance of three-phase voltage; Have that cost is low, dependable performance, simple in structure, easy to install and use, check meter simply, be particularly useful for the monitor to open-air power transformer remote monitor.
For realizing the foregoing invention purpose, the utility model adopts following technical scheme:
A kind of power transformer digital instrument device; Comprise: signals collecting sample circuit, analog to digital conversion circuit, micro-processor interface circuit, drive circuit, memory circuit and Display and Alarm Circuit; Said signals collecting sample circuit through analog to digital conversion circuit with digital data transmission to micro-processor interface circuit; Digital data transmission to drive circuit, actuator, memory circuit and Display and Alarm Circuit that micro-processor interface circuit is handled, said memory circuit is provided with reserve battery.
A kind of power transformer digital instrument device, said signals collecting sample circuit is made up of the zero-sequence current sample circuit of phase place phase failure sample circuit, phase place overvoltage sample circuit, temperature overload sample circuit, imbalance of three-phase voltage.
A kind of power transformer digital instrument device, said phase place phase failure sample circuit is linked to each other with power transformer three-phase A, B, C respectively by the elementary three phase winding BA1 of phase transformer, BA2, BA3 one end; The secondary three-phase winding L of phase transformer A1, LA2, LA3 series connection are connected to form through diode D, resistance R series connection.
A kind of power transformer digital instrument device, said phase place overvoltage sample circuit is linked to each other with power transformer three-phase A, B, C respectively by the elementary three phase winding BE1 of phase transformer, BE2, BE3 one end; The secondary three-phase winding L of phase transformer E1 is connected to form through diode D, resistance R series connection.
A kind of power transformer digital instrument device, said temperature overload sample circuit is made up of thermistor Rc1, potentiometer Rw1.
A kind of power transformer digital instrument device, said zero-sequence current sample circuit is enclosed within on the secondary neutral line of power transformer as elementary by annular AC converter LDA, and LDA arbitrary end of level of power pack is composed in series through diode D, resistance R.
Owing to adopt aforesaid technical scheme, the utlity model has following superiority:
A kind of power transformer digital instrument device; Can play integrated protection and the related data that shows power transformer to power transformer; Prevent that the serious accident that serious imbalance causes from appearring in transformer Yin Wendu overload, the phase failure, three-phase voltage; The utlity model has that mechanism is simple, cost is low, install simple, check meter conveniently.
Description of drawings
Fig. 1 is the circuit block diagram of power transformer digital instrument device.
Embodiment
As shown in Figure 1; A kind of power transformer digital instrument device; Comprise: signals collecting sample circuit, analog to digital conversion circuit, micro-processor interface circuit, drive circuit, memory circuit and Display and Alarm Circuit; Said signals collecting sample circuit through analog to digital conversion circuit with digital data transmission to micro-processor interface circuit, digital data transmission to drive circuit, memory circuit, actuator and Display and Alarm Circuit that micro-processor interface circuit is handled, said memory circuit is provided with reserve battery.
Said signals collecting sample circuit is made up of the zero-sequence current sample circuit of phase place phase failure sample circuit, phase place overvoltage sample circuit, temperature overload sample circuit, imbalance of three-phase voltage.
Said phase place phase failure sample circuit is linked to each other with power transformer three-phase A, B, C respectively by the elementary three phase winding BA1 of phase transformer, BA2, BA3 one end; The secondary three-phase winding L of phase transformer A1, LA2, LA3 series connection are connected to form through diode D, resistance R series connection.
Said phase place overvoltage sample circuit is linked to each other with power transformer three-phase A, B, C respectively by the elementary three phase winding BE1 of phase transformer, BE2, BE3 one end; The secondary three-phase winding L of phase transformer E1 is connected to form through diode D, resistance R series connection.
Said temperature overload sample circuit is made up of thermistor Rc1, potentiometer Rw1.
Said zero-sequence current sample circuit is enclosed within on the secondary neutral line of power transformer as elementary by annular AC converter LDA, and LDA arbitrary end of level of power pack is composed in series through diode D, resistance R.
During work; Said phase place phase failure sample circuit, when power transformer operation just often, the elementary three phase winding BA1 of phase transformer, BA2, BA3 all have electric current to pass through; The secondary three-phase winding L of phase transformer A1, LA2, LA3 all responds to that alternating voltage is arranged; The total alternating voltage of the vector of its series connection transfers to analog to digital conversion circuit through the series connection of diode D, resistance R, after the analog-to-digital conversion, with digital data transmission to micro-processor interface circuit; Digital data transmission to drive circuit, memory circuit, actuator and Display and Alarm Circuit that micro-processor interface circuit is handled; Because micro-processor interface circuit is carried out a mouthful output low level, actuator's relay J is failure to actuate, and Display and Alarm Circuit shows the not phase failure.
When the arbitrary phase phase failure of power transformer three-phase A, B, C, the corresponding secondary phase of also lacking, secondary three-phase winding L A1, LA2, the total alternating voltage of LA3 vector are 0V, micro-processor interface circuit is carried out a mouthful output positive level, actuator's relay J action; Normally closed some J-l breaks off simultaneously, cut off the power supply of the magnetic switch suction coil of power transformer, causes magnetic switch to be threaded off, and reaches the purpose of protection power transformer and load thereof.Simultaneously, Display and Alarm Circuit shows open phase fault and warning.
In like manner, said phase place overvoltage sample circuit is when power transformer moves just often; Phase place overvoltage sample circuit transfers to micro-processor interface circuit through analog to digital conversion circuit; Micro-processor interface circuit is carried out a mouthful output low level, and actuator's relay J is failure to actuate, and Display and Alarm Circuit shows normal.
Normally closed some J-l breaks off simultaneously, cut off the power supply of the magnetic switch suction coil of power transformer, causes magnetic switch to be threaded off, and reaches the purpose of protection power transformer and load thereof.Simultaneously, Display and Alarm Circuit shows open phase fault and warning.
When electric administrative department is misoperation owing to the people; Cause when internal overvoltage reaches 2.5 times of power transformer rated voltages with an interior numerical value; The corresponding primary and secondary voltage of transformer BE1, BE2, BE3 that makes raises relatively; And transfer to micro-processor interface circuit through analog to digital conversion circuit, micro-processor interface circuit is carried out a mouthful output positive level, actuator's relay J action; Simultaneously normally closed some J-l breaks off, and cut off the power supply of the suction coil in the magnetic switch of power transformer, magnetic switch threaded off, the purpose of protection power transformer and load thereof.Simultaneously, Display and Alarm Circuit shows the overvoltage fault.
In like manner, said temperature overload sample circuit is when power transformer normally moves; Be installed in insulating oil upper strata temperature and be no more than 55 ° of C; Thermistor RC1 transfers to micro-processor interface circuit through analog to digital conversion circuit, sets micro-processor interface circuit and carries out a mouthful output negative level, and actuator's relay J is failure to actuate;
When electric power transformer insulated oily upper strata temperature surpasses 55 ° of C, the thermistor RC1 of temperature influence transfers to micro-processor interface circuit through analog to digital conversion circuit, and micro-processor interface circuit is carried out a mouthful output positive level, actuator's relay J action; Magnetic switch is threaded off, the protection power transformer, simultaneously, Display and Alarm Circuit shows overload fault.
In like manner; Said zero-sequence current sample circuit; When power transformer three-phase A, B, C balance, the zero sequence no current passes through, and the annular AC converter LDA that is enclosed within the secondary neutral line of power transformer transfers to micro-processor interface circuit through analog to digital conversion circuit with signal; Micro-processor interface circuit is carried out a mouthful output negative level, and actuator's relay J is failure to actuate;
When power transformer three-phase A, B, C arbitrary when uneven mutually; The neutral line has zero-sequence current; There is induced voltage at the annular AC converter LDA two ends that are enclosed within the secondary neutral line of power transformer; Through analog to digital conversion circuit signal is transferred to micro-processor interface circuit, micro-processor interface circuit is carried out a mouthful output positive level, actuator's relay J action; Magnetic switch is threaded off, the protection power transformer, simultaneously, Display and Alarm Circuit shows the three-phase imbalance fault.
The digital signal that said micro-processor interface circuit is handled is through memory circuitry stores, and said memory circuit is provided with reserve battery, and protected data can not lost because of power failure.
Claims (6)
1. power transformer digital instrument device; It is characterized in that: comprising: signals collecting sample circuit, analog to digital conversion circuit, micro-processor interface circuit, drive circuit, memory circuit and Display and Alarm Circuit; Said signals collecting sample circuit through analog to digital conversion circuit with digital data transmission to micro-processor interface circuit; Digital data transmission to drive circuit, memory circuit, actuator and Display and Alarm Circuit that micro-processor interface circuit is handled, said memory circuit is provided with reserve battery.
2. a kind of power transformer digital instrument device according to claim 1 is characterized in that: said signals collecting sample circuit is made up of the zero-sequence current sample circuit of phase place phase failure sample circuit, phase place overvoltage sample circuit, temperature overload sample circuit, imbalance of three-phase voltage.
3. a kind of power transformer digital instrument device according to claim 2 is characterized in that: said phase place phase failure sample circuit is linked to each other with power transformer three-phase A, B, C respectively by the elementary three phase winding BA1 of phase transformer, BA2, BA3 one end; The secondary three-phase winding L of phase transformer A1, LA2, LA3 series connection are connected to form through diode D, resistance R series connection.
4. a kind of power transformer digital instrument device according to claim 2 is characterized in that: said phase place overvoltage sample circuit is linked to each other with power transformer three-phase A, B, C respectively by the elementary three phase winding BE1 of phase transformer, BE2, BE3 one end; The secondary three-phase winding L of phase transformer E1 is connected to form through diode D, resistance R series connection.
5. a kind of power transformer digital instrument device according to claim 2 is characterized in that: said temperature overload sample circuit is made up of thermistor Rc1, potentiometer Rw1.
6. a kind of power transformer digital instrument device according to claim 2; It is characterized in that: said zero-sequence current sample circuit is enclosed within on the secondary neutral line of power transformer as elementary by annular AC converter LDA, and LDA arbitrary end of level of power pack is composed in series through diode D, resistance R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205054226U CN202395424U (en) | 2011-12-07 | 2011-12-07 | Digital instrument device of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205054226U CN202395424U (en) | 2011-12-07 | 2011-12-07 | Digital instrument device of power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202395424U true CN202395424U (en) | 2012-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205054226U Expired - Fee Related CN202395424U (en) | 2011-12-07 | 2011-12-07 | Digital instrument device of power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202395424U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132473A (en) * | 2017-05-17 | 2017-09-05 | 肇庆三向教学仪器制造有限公司 | A kind of low-voltage intelligent monitoring terminal |
-
2011
- 2011-12-07 CN CN2011205054226U patent/CN202395424U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132473A (en) * | 2017-05-17 | 2017-09-05 | 肇庆三向教学仪器制造有限公司 | A kind of low-voltage intelligent monitoring terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 Termination date: 20121207 |