CN208607278U - A kind of current testing device for CVT secondary voltage test device - Google Patents
A kind of current testing device for CVT secondary voltage test device Download PDFInfo
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- CN208607278U CN208607278U CN201820804698.6U CN201820804698U CN208607278U CN 208607278 U CN208607278 U CN 208607278U CN 201820804698 U CN201820804698 U CN 201820804698U CN 208607278 U CN208607278 U CN 208607278U
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Abstract
The utility model discloses a kind of current testing devices for CVT secondary voltage test device, including relay, current-to-voltage convertor, scaling circuit, AD conversion module, voltage amplifier circuit and micro-chip processor, the switch-side of relay is arranged between CVT secondary side and voltage test device；The electric current of the input terminal acquisition CVT secondary side of current-to-voltage convertor, the output end of current-to-voltage convertor are electrically connected with the input terminal of scaling circuit；The output end of scaling circuit is electrically connected with the input terminal of AD conversion module；The output end of AD conversion module is electrically connected with the input terminal of micro-chip processor；First output end of micro-chip processor is electrically connected with the input terminal of voltage amplifier circuit；The output end of voltage amplifier circuit is electrically connected with the control terminal of relay.The utility model can monitor the electric current of CVT collection terminal, work as controller, then disconnect test loop, prevent CVT secondary side from short circuit phenomenon occur, effective protection CVT equipment and CVT voltage on-Line Monitor Device.
Description
Technical field
The utility model relates to testing current field, more particularly, to a kind of for CVT secondary voltage test device
Current testing device.
Background technique
Capacitance type potential transformer (Capacitor Voltage Transformer, CVT) is widely used in electric power
In system, main function is to monitor the voltage condition of power bus-bar and route, be a kind of voltage supplied measurement, power observing and controlling,
Automatically control, the power equipment that relay protection is simultaneously used as power line carrier capacitor, due to its impact strength it is small, it is small in size,
It is light-weight, it can reliably damp ferromagnetic resonance again in practical applications and have the advantages of excellent transient response characteristic, gradually take
It is a kind of essential equipment in power grid for electromagnetic potential transformer.
CVT mainly obtains the voltage of bus or route by way of capacitance partial pressure, then passes through electromagnetic transformer
Actual bus or line voltage distribution are depressured to the secondary side of maximum 100V/57.7V.Then again by scheduling and the systems such as relay protection Lai
Obtain this voltage, then the anti-virtual voltage for releasing bus or route.When actual motion, the systems such as scheduling and relay protection are obtained from CVT
Voltage be only used for the operating condition of monitoring bus or route, the situation of CVT equipment itself is not relevant for, and if CVT
Failure occur will lead to voltage monitoring appearance exception, may cause to judge by accident to scheduling and after insurance system.Therefore guarantee CVT health
It runs extremely important to the stable operation of electric system.
Therefore the electric power enterprise currently having has used CVT voltage on-Line Monitor Device, by obtaining CVT electricity from scheduling system
Data are pressed to judge the health status of CVT.But CVT voltage will arrive scheduling system and can pass through longer physics and communication
Link.And if the voltage that information misinformation or poor contact will also result in scheduling system goes wrong.Accordingly even when voltage has
Whether mistake is also unable to judge accurately CVT defective.But if CVT secondary side or equipment acquisition port have occurred short circuit or
Other failures may cause device and be damaged, in some instances it may even be possible to be damaged CVT equipment, bring serious problem.
Utility model content
The utility model overcomes the defect of existing CVT detection, provides the new CVT secondary voltage that is used for of one kind and tests dress
The current testing device set.The utility model is realized when the work of CVT on-Line Monitor Device, can monitor CVT collection terminal
Electric current, when electric current be more than given threshold, then disconnect test loop, prevent CVT secondary side from short circuit phenomenon, effective protection occur
CVT equipment and CVT voltage on-Line Monitor Device.
In order to solve the above technical problems, the technical solution of the utility model is as follows:
A kind of current testing device for CVT secondary voltage test device, including relay, current-to-voltage convertor,
Scaling circuit, AD conversion module, voltage amplifier circuit and micro-chip processor, wherein
The switch-side of the relay is arranged between CVT secondary side and voltage test device, when the switch of relay
When side disconnects, voltage test device can not acquire the voltage signal of CVT secondary side；
The test point of CVT secondary side is arranged in the current-to-voltage convertor, and the input terminal of current-to-voltage convertor is adopted
Collect the electric current of CVT secondary side, the output end of current-to-voltage convertor is electrically connected with the input terminal of scaling circuit；
The output end of the scaling circuit is electrically connected with the input terminal of AD conversion module；
The output end of the AD conversion module is electrically connected with the input terminal of micro-chip processor；
First output end of the micro-chip processor is electrically connected with the input terminal of voltage amplifier circuit；
The output end of the voltage amplifier circuit is electrically connected with the control terminal of relay, and the control terminal of relay can be controlled
The open/close state of the switch-side of relay processed.
Utility model works process is as follows:
The current signal (0 ~ 1A) of CVT secondary side is converted to voltage signal (0 ~ 24V by current-to-voltage convertor
), voltage signal is divided by scaling circuit, then carries out analog-to-digital conversion by AD conversion module,
Obtain the voltage division signal of number.Micro-chip processor judges whether CVT secondary side occurs short circuit phenomenon according to digital voltage division signal.
If there is short circuit phenomenon, then micro-chip processor issues high-voltage signal, is boosted by voltage amplifier circuit, thus triggering after
Electric appliance turns off the test circuit of CVT secondary side, protects relevant device.
In a preferred solution, scaling circuit includes first resistor, second resistance, 3rd resistor, the 4th electricity
Resistance, the 5th resistance, the 6th resistance, operational amplifier, wherein
Input terminal of the one end of the first resistor as scaling circuit, one end of first resistor and 3rd resistor
One end electrical connection；
The other end of the 3rd resistor is electrically connected with the non-inverting input terminal of operational amplifier；
The other end of the 3rd resistor is electrically connected with one end of the 5th resistance；
The other end of 5th resistance is grounded；
The other end of the first resistor is electrically connected with one end of second resistance；
The other end of the second resistance is grounded；
The other end of the first resistor is electrically connected with one end of the 4th resistance；
The other end of 4th resistance is electrically connected with the inverting input terminal of operational amplifier；
The other end of 4th resistance is electrically connected with one end of the 6th resistance；
The other end of 6th resistance is electrically connected with the output end of operational amplifier, and the output end of operational amplifier is made
For the output end of scaling circuit.
In a preferred solution, the operational amplifier is rail-to-rail operational amplifier.
In this preferred embodiment, rail-to-rail operational amplifier has input over-voltage protecting function, for being higher or lower than power supply
Range within 32 V of voltage of rail, will not occur reverse phase or latch.Draw when open circuit or other problems suddenly occur for collection terminal
Rise collection voltages it is excessive when, can to test device carry out overvoltage protection.
In a preferred solution, the resistance value of the 3rd resistor in the scaling circuit and the 4th resistance
Resistance value is equal；The resistance value of 5th resistance is equal with the resistance value of the 6th resistance.
This preferred embodiment is to simplify circuit design.
In a preferred solution, the resistance value of the 3rd resistor in the scaling circuit and the 5th resistance
Resistance value is equal.
This preferred embodiment is to simplify circuit design.
In a preferred solution, the current testing device further includes low-pass filter circuit, the low pass filtered
The input terminal of wave circuit is electrically connected with the output end of scaling circuit, the output end of low-pass filter circuit and AD conversion module
Input terminal electrical connection.
In this preferred embodiment, filter circuit is to filter out the high-frequency noise in the signal of the output end of scaling circuit.
In a preferred solution, the low-pass filter circuit includes the first tunable capacitor, the second tunable capacitor, the
Three tunable capacitors, inductance, wherein
Input terminal of the one end of the inductance as low-pass filter circuit, the other end of inductance is as low-pass filter circuit
Output end；
One end of the inductance is electrically connected with one end of the first tunable capacitor；
The other end of first tunable capacitor is grounded；
One end of the inductance is electrically connected with one end of the second tunable capacitor；
The other end of the inductance is electrically connected with the other end of the second tunable capacitor；
The other end of the inductance is electrically connected with one end of third tunable capacitor；
The other end of the third tunable capacitor is grounded.
It, can be by adjusting adjusting of the capacitor realization to frequency filtering to three in this preferred embodiment.
In a preferred solution, the voltage amplifier circuit include the 7th resistance, the 8th resistance, the 9th resistance,
Tenth resistance, the second capacitor, third capacitor, the 4th capacitor and NPN triode, wherein
Input terminal of the one end of second capacitor as voltage amplifier circuit, the other end and NPN tri- of the second capacitor
The ground level of pole pipe is electrically connected；
The other end of second capacitor is electrically connected with one end of the 7th resistance；
The other end of second capacitor is electrically connected with one end of the 8th resistance；
Another termination power of 7th resistance；
The other end of 8th resistance is grounded；
The other end of 7th resistance is electrically connected with one end of the 9th resistance；
The other end of 9th resistance is electrically connected with the current collection grade of NPN triode；
The emitting stage of the NPN triode is electrically connected with one end of the tenth resistance；
The other end of tenth resistance is electrically connected with the other end of the 8th resistance；
The emitting stage of the NPN triode is electrically connected with one end of the 4th capacitor；
The other end of tenth resistance is electrically connected with the other end of the 4th capacitor；
The current collection grade of the NPN triode is electrically connected with one end of third capacitor, and the other end of third capacitor is as electricity
Press the output end of amplifying circuit.
In a preferred solution, the current testing device further includes data storage, the data storage
The input terminal of device is electrically connected with the second output terminal of micro-chip processor.
In this preferred embodiment, data storage is used to save the short circuit information of relevant CVT secondary side.
In a preferred solution, the current testing device further includes wireless communication module, the channel radio
The input terminal of letter module is electrically connected with the third output end of micro-chip processor.
In this preferred embodiment, wireless communication module be used for by the short circuit information of CVT secondary side be sent to remote system or
Staff is on hand.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
The utility model is realized when the work of CVT on-Line Monitor Device, can be monitored the electric current of CVT collection terminal, be worked as electricity
Stream is more than given threshold, then disconnects test loop, prevent CVT secondary side from short circuit phenomenon occur, effective protection CVT equipment and
CVT voltage on-Line Monitor Device.
Detailed description of the invention
Fig. 1 is the module installation diagram of embodiment.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The technical solution of the utility model is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of current testing device for CVT secondary voltage test device, including relay, electric current electricity
Pressure converter, scaling circuit, AD7920, voltage amplifier circuit, low-pass filter circuit, 4G communication module, TF card and
MSP430F5, wherein
The switch-side of relay is arranged between CVT secondary side and voltage test device, when the switch-side of relay disconnects
When, voltage test device can not acquire the voltage signal of CVT secondary side；
The test point of CVT secondary side is arranged in current-to-voltage convertor, and the input terminal of current-to-voltage convertor acquires CVT bis-
The electric current of secondary side, the output end of current-to-voltage convertor are electrically connected with the input terminal of scaling circuit；
The output end of scaling circuit is electrically connected with the input terminal of low-pass filter circuit；
The output end of low-pass filter circuit is electrically connected with the input terminal of AD conversion module；
The output end of AD conversion module is electrically connected with the input terminal of micro-chip processor；
The first output end of MSP430F5 is electrically connected with the input terminal of voltage amplifier circuit；
The output end of voltage amplifier circuit is electrically connected with the control terminal of relay, and the control terminal of relay can control relay
The open/close state of the switch-side of device；
The second output terminal of MSP430F5 is electrically connected with the input terminal of 4G communication module；
The third output end of MSP430F5 is electrically connected with the input terminal of TF card.
Wherein, scaling circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
Six resistance, ADA4096,
Input terminal of the one end of first resistor as scaling circuit, one end of first resistor and one end of 3rd resistor
Electrical connection；
The other end of 3rd resistor is electrically connected with the non-inverting input terminal of ADA4096；
The other end of 3rd resistor is electrically connected with one end of the 5th resistance；
The other end of 5th resistance is grounded；
The other end of first resistor is electrically connected with one end of second resistance；
The other end of second resistance is grounded；
The other end of first resistor is electrically connected with one end of the 4th resistance；
The other end of 4th resistance is electrically connected with the inverting input terminal of ADA4096；
The other end of 4th resistance is electrically connected with one end of the 6th resistance；
The other end of 6th resistance is electrically connected with the output end of ADA4096, and the output end of ADA4096 is as scale operation electricity
The output end on road；
The resistance value of 3rd resistor is equal with the resistance value of the 4th resistance；
The resistance value of 5th resistance is equal with the resistance value of the 6th resistance；
The resistance value of 3rd resistor is equal with the resistance value of the 5th resistance.
Wherein, low-pass filter circuit includes the first tunable capacitor, the second tunable capacitor, third tunable capacitor, inductance, inductance
Input terminal of the one end as low-pass filter circuit, output end of the other end of inductance as low-pass filter circuit；
One end of inductance is electrically connected with one end of the first tunable capacitor；
The other end of first tunable capacitor is grounded；
One end of inductance is electrically connected with one end of the second tunable capacitor；
The other end of inductance is electrically connected with the other end of the second tunable capacitor；
The other end of inductance is electrically connected with one end of third tunable capacitor；
The other end of third tunable capacitor is grounded.
Wherein, voltage amplifier circuit includes the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second capacitor, the
Three capacitors, the 4th capacitor and NPN triode, input terminal of the one end of the second capacitor as voltage amplifier circuit, the second capacitor
The other end is electrically connected with the ground level of NPN triode；
The other end of second capacitor is electrically connected with one end of the 7th resistance；
The other end of second capacitor is electrically connected with one end of the 8th resistance；
Another termination power of 7th resistance；
The other end of 8th resistance is grounded；
The other end of 7th resistance is electrically connected with one end of the 9th resistance；
The other end of 9th resistance is electrically connected with the current collection grade of NPN triode；
The emitting stage of the NPN triode is electrically connected with one end of the tenth resistance；
The other end of tenth resistance is electrically connected with the other end of the 8th resistance；
The emitting stage of NPN triode is electrically connected with one end of the 4th capacitor；
The other end of tenth resistance is electrically connected with the other end of the 4th capacitor；
The current collection grade of NPN triode is electrically connected with one end of third capacitor, and the other end of third capacitor is as voltage amplification
The output end of circuit.
The present embodiment course of work:
MSP430F5 receives data, when the voltage of scaling circuit output is greater than 1.2V, can determine whether that CVT secondary side is sent out
Failure is given birth to, single-chip microcontroller will generate high level on P1 at this time.Then the coil of relay is connected to by voltage amplifier circuit
On, so that normally closed contact disconnection is controlled, to make entirely to test circuit disconnection, for protecting secondary side.
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in
Within the protection scope of the utility model claims.
Claims (7)
1. a kind of current testing device for CVT secondary voltage test device, including relay, current-to-voltage convertor, ratio
Example computing circuit, AD conversion module, voltage amplifier circuit and micro-chip processor, wherein
The switch-side of the relay is arranged between CVT secondary side and voltage test device, when the switch-side of relay is disconnected
When opening, voltage test device can not acquire the voltage signal of CVT secondary side；
The test point of CVT secondary side is arranged in the current-to-voltage convertor, and the input terminal of current-to-voltage convertor acquires CVT
The electric current of secondary side, the output end of current-to-voltage convertor are electrically connected with the input terminal of scaling circuit；
The output end of the scaling circuit is electrically connected with the input terminal of AD conversion module；
The output end of the AD conversion module is electrically connected with the input terminal of micro-chip processor；
First output end of the micro-chip processor is electrically connected with the input terminal of voltage amplifier circuit；
The output end of the voltage amplifier circuit is electrically connected with the control terminal of relay, the control terminal of relay can control after
The open/close state of the switch-side of electric appliance；
The scaling circuit includes first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th electricity
Resistance, operational amplifier, wherein
The one of input terminal of the one end of the first resistor as scaling circuit, one end of first resistor and 3rd resistor
End electrical connection；
The other end of the 3rd resistor is electrically connected with the non-inverting input terminal of operational amplifier；
The other end of the 3rd resistor is electrically connected with one end of the 5th resistance；
The other end of 5th resistance is grounded；
The other end of the first resistor is electrically connected with one end of second resistance；
The other end of the second resistance is grounded；
The other end of the first resistor is electrically connected with one end of the 4th resistance；
The other end of 4th resistance is electrically connected with the inverting input terminal of operational amplifier；
The other end of 4th resistance is electrically connected with one end of the 6th resistance；
The other end of 6th resistance is electrically connected with the output end of operational amplifier, the output end of operational amplifier be used as than
The output end of example computing circuit；
The current testing device further includes low-pass filter circuit, the input terminal and scale operation of the low-pass filter circuit
The output end of circuit is electrically connected, and the output end of low-pass filter circuit is electrically connected with the input terminal of AD conversion module；
The low-pass filter circuit includes the first tunable capacitor, the second tunable capacitor, third tunable capacitor, inductance, wherein
Input terminal of the one end of the inductance as low-pass filter circuit, the other end of inductance is as the defeated of low-pass filter circuit
Outlet；
One end of the inductance is electrically connected with one end of the first tunable capacitor；
The other end of first tunable capacitor is grounded；
One end of the inductance is electrically connected with one end of the second tunable capacitor；
The other end of the inductance is electrically connected with the other end of the second tunable capacitor；
The other end of the inductance is electrically connected with one end of third tunable capacitor；
The other end of the third tunable capacitor is grounded.
2. current testing device according to claim 1, which is characterized in that the operational amplifier is rail-to-rail operation
Amplifier.
3. current testing device according to claim 2, which is characterized in that the third electricity in the scaling circuit
The resistance value of resistance is equal with the resistance value of the 4th resistance；The resistance value of 5th resistance is equal with the resistance value of the 6th resistance.
4. current testing device according to claim 3, which is characterized in that the third electricity in the scaling circuit
The resistance value of resistance is equal with the resistance value of the 5th resistance.
5. according to claim 1 to current testing device described in any claim in 4, which is characterized in that the voltage
Amplifying circuit include the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the second capacitor, third capacitor, the 4th capacitor and
NPN triode, wherein
Input terminal of the one end of second capacitor as voltage amplifier circuit, the other end and NPN triode of the second capacitor
Ground level electrical connection；
The other end of second capacitor is electrically connected with one end of the 7th resistance；
The other end of second capacitor is electrically connected with one end of the 8th resistance；
Another termination power of 7th resistance；
The other end of 8th resistance is grounded；
The other end of 7th resistance is electrically connected with one end of the 9th resistance；
The other end of 9th resistance is electrically connected with the current collection grade of NPN triode；
The emitting stage of the NPN triode is electrically connected with one end of the tenth resistance；
The other end of tenth resistance is electrically connected with the other end of the 8th resistance；
The emitting stage of the NPN triode is electrically connected with one end of the 4th capacitor；
The other end of tenth resistance is electrically connected with the other end of the 4th capacitor；
The current collection grade of the NPN triode is electrically connected with one end of third capacitor, and the other end of third capacitor is put as voltage
The output end of big circuit.
6. current testing device according to claim 5, which is characterized in that the current testing device further includes data
Memory, the input terminal of the data storage are electrically connected with the second output terminal of micro-chip processor.
7. according to claim 1, current testing device described in 2,3,4 or 6, which is characterized in that the current testing device
It further include wireless communication module, the input terminal of the wireless communication module is electrically connected with the third output end of micro-chip processor.
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| CN201820804698.6U CN208607278U (en) | 2018-05-28 | 2018-05-28 | A kind of current testing device for CVT secondary voltage test device |
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| CN201820804698.6U CN208607278U (en) | 2018-05-28 | 2018-05-28 | A kind of current testing device for CVT secondary voltage test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542783A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | Current testing device for CVT secondary voltage testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542783A (en) * | 2018-05-28 | 2019-12-06 | 广东电网有限责任公司 | Current testing device for CVT secondary voltage testing device |
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