CN202616867U - Cutting device for asymmetric running state of supply transformer - Google Patents
Cutting device for asymmetric running state of supply transformer Download PDFInfo
- Publication number
- CN202616867U CN202616867U CN 201220170815 CN201220170815U CN202616867U CN 202616867 U CN202616867 U CN 202616867U CN 201220170815 CN201220170815 CN 201220170815 CN 201220170815 U CN201220170815 U CN 201220170815U CN 202616867 U CN202616867 U CN 202616867U
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- transformer
- circuit
- microprocessor
- pass filter
- low pass
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Abstract
The utility model relates to a cutting device for an asymmetric running state of a supply transformer. The device is characterized in that a residual current transformer is arranged at a high-voltage side of the transformer, wherein the residual current transformer is connected to an input terminal of a shunt circuit; and an output terminal of the shunt circuit is connected with a differential amplifier that is connected with a low pass filter. The low pass filter outputs a sampling signal to an input port of a microprocessor; and the output terminal of the microprocessor is connected with a switching circuit that is connected with an operating circuit. According to the utility model, the residual current transformer is employed to obtain negative-sequence and zero-sequence currents; a sampling input current signal is obtained through the shunt circuit, the differential amplifier and the low pass filter; and the sampling input current signal is compared with a threshold value set by the microprocessor; once the threshold value is exceeded, a signal is outputted and thus the switching circuit is switched into connection, the operating circuit makes motions, and the power supply is cut off by an electric operation, so that switching of an emergency power supply for the signal power source conversion equipment can be ensured. According to the utility model, the provided cutting device has characteristics of good security and reliability.
Description
Technical field
The utility model relates to power distribution equipment, specifically is a kind of supply transformer asymmetric operating state shearing device that is used for railway signals equipment.
Background technology
When single-phase open phase fault took place the transformer high-voltage side, transformer was in steady running status of single-phase anti-phase no-load running state and overload, forms serious asymmetric operating in the three-phase net.To this abnormal running state, low-voltage distribution apparatus does not have the technical measures of automatic fast shut-off trouble power; Electricity consumption department does not possess when this state yet and is transformed into the stand-by power supply function automatically, takes place to have a power failure and could be transformed into the stand-by power supply function automatically during phase shortage and only possess when low-pressure side.The above-mentioned normal operation that has a strong impact on railway signals equipment causes the railway traffic shipping accident.
Summary of the invention
The purpose of the utility model is to the problems referred to above, propose a kind of when single-phase open phase fault takes place the transformer high-voltage side, the supply transformer asymmetric operating state shearing device of the trouble power that can automatically switch.
The purpose of the utility model solves through following technical scheme: a kind of supply transformer asymmetric operating state shearing device; It is characterized in that residual current transformer being set in the transformer high-voltage side; Above-mentioned residual current transformer is connected the input of shunt circuit; The output of shunt circuit connects differential amplifier, and differential amplifier connects low pass filter, and low pass filter output sampled signal is to the input port of microprocessor; Output end of microprocessor is connected with a switching circuit, and switching circuit is connected with function circuit.
When single-phase open phase fault takes place in the electric power system high-pressure side, generally overvoltage, overcurrent can be do not caused, but in system, negative phase-sequence and zero-sequence component can be produced with the normal operation of the system of influence.The supply transformer asymmetric operating state shearing device of the utility model; Adopt residual current transformer to obtain negative phase-sequence and zero-sequence current, obtain the input current signal of sampling through shunt circuit, differential amplifier and low pass filter, the threshold value that sampling input current signal and microprocessor are set compares; In case exceeding threshold value promptly exports signal and makes the switching circuit conducting; Function circuit action, electricity be cut-off electricity power supply rashly, guarantees that the signal power source conversion equipment switches to stand-by power supply.The utlity model has the characteristics of fail safe, good reliability.
Description of drawings
Fig. 1 is the circuit theory diagrams of the supply transformer asymmetric operating state shearing device of the utility model.
Embodiment
The utility model is described further through embodiment below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of supply transformer asymmetric operating state shearing device is characterized in that in the transformer high-voltage side residual current transformer being set; Above-mentioned residual current transformer is connected the input of shunt circuit; The output of shunt circuit connects differential amplifier, and differential amplifier connects low pass filter, and low pass filter output sampled signal is to the input port of microprocessor; Output end of microprocessor is connected with a switching circuit, and switching circuit is connected with function circuit.
Above-mentioned residual current transformer LH; Shunt circuit is made up of resistance R 1, R2, R3; Differential amplifier is made up of integrated operational amplifier A1, resistance R 4, R5, R6, R7, R8, R9 and capacitor C 1, and low pass filter is made up of resistance R 10, R11, R12 and capacitor C 2, and microprocessor D1 adopts the STC12C5A60S2 with analog-digital conversion function; Switching circuit is made up of triode Q1, and function circuit is made up of relay J.
Claims (1)
1. supply transformer asymmetric operating state shearing device; It is characterized in that in the transformer high-voltage side residual current transformer being set, above-mentioned residual current transformer is connected the input of shunt circuit, and the output of shunt circuit connects differential amplifier; Differential amplifier connects low pass filter; Low pass filter output sampled signal is to the input port of microprocessor, and output end of microprocessor is connected with a switching circuit, and switching circuit is connected with function circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220170815 CN202616867U (en) | 2012-04-22 | 2012-04-22 | Cutting device for asymmetric running state of supply transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220170815 CN202616867U (en) | 2012-04-22 | 2012-04-22 | Cutting device for asymmetric running state of supply transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616867U true CN202616867U (en) | 2012-12-19 |
Family
ID=47350537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220170815 Expired - Fee Related CN202616867U (en) | 2012-04-22 | 2012-04-22 | Cutting device for asymmetric running state of supply transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202616867U (en) |
-
2012
- 2012-04-22 CN CN 201220170815 patent/CN202616867U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Cutting device for asymmetric running state of supply transformer Effective date of registration: 20140923 Granted publication date: 20121219 Pledgee: Bank of Jiaxing Limited by Share Ltd hi tech sub branch Pledgor: Jiaxing Yingnuo Weite Electronic Technology Co.,Ltd. Registration number: 2014330000036 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20160307 Granted publication date: 20121219 Pledgee: Bank of Jiaxing Limited by Share Ltd hi tech sub branch Pledgor: Jiaxing Yingnuo Weite Electronic Technology Co.,Ltd. Registration number: 2014330000036 |
|
| PLDC | Enforcement, change and cancellation of contracts on pledge of patent right or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20190422 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |