CN209389686U - A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function - Google Patents
A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function Download PDFInfo
- Publication number
- CN209389686U CN209389686U CN201920348744.0U CN201920348744U CN209389686U CN 209389686 U CN209389686 U CN 209389686U CN 201920348744 U CN201920348744 U CN 201920348744U CN 209389686 U CN209389686 U CN 209389686U
- Authority
- CN
- China
- Prior art keywords
- current
- control circuit
- alternating
- current transformer
- earth leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of earth leakage protective devices of electric vehicle alternating-current charging pile with self-checking function, including current transformer, current-to-voltage converter, the control circuit of exportable alternating current and leakage analog circuit；The current transformer is sheathed on firewire and zero curve, the input terminal of the output end connection current-to-voltage converter of the current transformer, the input terminal of the output end connection control circuit of the current-to-voltage converter, the leakage analog circuit is primary coil, the primary coil is around on current transformer, and the both ends of primary coil are separately connected two output ends of alternating current in control circuit；The frequency of the alternating current of the control circuit output is lower than the maximum operation frequency of current transformer.
Description
Technical field
The utility model relates to electric vehicle alternating-current charging pile technical fields, especially a kind of with the electronic of self-checking function
The earth leakage protective device of automobile alternating-current charging pile.
Background technique
The earth leakage protective device of existing alternating-current charging pile is as shown in Figure 1:
By firewire and zero curve also cross a current transformer, the electric current on firewire and zero curve is always big under normal circumstances
The small same direction is on the contrary, electromagnetic field offsets each other.Once leaking electricity, firewire and size of current on zero curve are different, magnetic field without
Method offsets each other, and current transformer will generate induced current at this time, by generating induction after current-to-voltage converter at S1
Voltage, control circuit detect that the voltage is considered as that leak current fault has occurred, and disconnect firewire and zero curve immediately.
But if the devices such as current transformer, current-to-voltage converter are due to vibration, aging, a variety of causes such as substandard products
It breaks down or the relevant circuit of detection of electrical leakage goes wrong, will lead to creepage protection function can not come into force.
Utility model content
To solve problems of the prior art, the utility model provides a kind of electric car with self-checking function
The earth leakage protective device of alternating-current charging pile.
The technical solution adopted in the utility model is:
A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function, including current transformer, electricity
Stream-voltage changer, the control circuit of exportable alternating current and leakage analog circuit；The current transformer is sheathed on firewire
On zero curve, the input terminal of the output end connection current-to-voltage converter of the current transformer, the current-voltage transformation
The input terminal of the output end connection control circuit of device, the leakage analog circuit is primary coil, which is around in electric current
On mutual inductor, the both ends of primary coil are separately connected two output ends of alternating current in control circuit；The control circuit output
Alternating current frequency be lower than current transformer maximum operation frequency.
The utility model is compared with existing earth leakage protective device, more primary coils of a leakage analog, effect
It leaky is exactly simulated, sees that can equipment be correctly detecting electric leakage, thus determine whether creepage protection function comes into force.
The alternating current of control circuit exportable given frequency and size, primary coil become according to different current transformers
Ratio is flowed, 1 is may be selected and arrives N circle.Before needing to connect Live line Zero line every time and starting to charge, all simulated by leakage analog circuit
Primary electric leakage, if control circuit is able to detect that the leaky, can connect Live line Zero line；If control circuit can not be examined
The leaky is measured, illustrates that earth leakage detection functions do not work normally, then sends warning message, and Live line Zero line is kept disconnected
Open state cannot open charging.
The pitch of the laps the number of turns of the size of current and loop of electric leakage of control circuit output on current transformer, codetermines
The size of secondary current, as long as being in principle adjusted in the range of current transformer is able to detect.
In order to which current transformer can be worked normally, the frequency of the alternating current of the control circuit output is had to be lower than
The maximum operation frequency of current transformer.
Preferably, the frequency of the alternating current of the control circuit output is 50Hz or 60Hz.
The frequency of the alternating current of the control circuit output can be 50Hz or 60Hz by programming Control, representative value.
The frequency recommendation of simulation electric leakage is adjusted to frequency identical with power grid alternating current, such as 50Hz or 60Hz.
Preferably, when the primary coil is powered, size of current 6mA-30mA.
When the primary coil is powered, size of current can pass through programming Control, representative value 6mA-30mA.
In principle, electric current when primary coil is powered, as long as being adjusted in the range of current transformer is able to detect,
Recommendation is adjusted between 6mA to 30mA, because this is the earth leakage protective value range of AC charging national regulations.
Preferably, the pitch of the laps the number of turns of the primary coil on current transformer is 1 circle.
The pitch of the laps the number of turns of the primary coil on current transformer is adjustable, and representative value is 1 circle.
It simulates the pitch of the laps the number of turns of loop of electric leakage on current transformer and is recommended as 1 circle, that is, as zero curve and firewire
Current transformer is simply passed through, production in this way installs that cost is relatively low.
The beneficial effects of the utility model are: all passing through electric leakage before needing to connect Live line Zero line every time and starting to charge
Analog loopback simulates primary electric leakage, if control circuit is able to detect that the leaky, can connect Live line Zero line；If
Control circuit can not detect the leaky, illustrate that earth leakage detection functions do not work normally, then send warning message, and will
Live line Zero line remains off, and cannot open charging.Compared to existing earth leakage protective device, current transformer, electricity are avoided
The devices such as stream-voltage changer are due to vibration, and aging, a variety of causes such as substandard products break down or the relevant electricity of detection of electrical leakage
Road goes wrong, and will lead to the problem of creepage protection function can not come into force, and earth leakage protective reliability is higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the earth leakage protective device of existing alternating-current charging pile；
Fig. 2 is the structural schematic diagram of earth leakage protective device in the utility model embodiment；
Appended drawing reference: 10, current transformer, 11, current-to-voltage converter, 12, control circuit, S1, control circuit input
End, 13, firewire, 14, zero curve, 20, current transformer, 21, current-to-voltage converter, 22, control circuit, S2, control circuit are defeated
Enter to hold, PA, control circuit alternating current output end, PB, control circuit alternating current output end, 23, leakage analog circuit, 24,
Firewire, 25, zero curve.
Specific embodiment
The embodiments of the present invention are described in detail with reference to the accompanying drawing.
Embodiment
As shown in Fig. 2, a kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function, including electric current
Mutual inductor 20, current-to-voltage converter 21, the control circuit 22 of exportable alternating current and leakage analog circuit 23；The electricity
Current transformer 20 is sheathed on firewire 24 and zero curve 25, and the output end of the current transformer 20 connects current-to-voltage converter
21 input terminal, the input terminal of the output end connection control circuit 22 of the current-to-voltage converter 21, the leakage analog return
Road 23 is primary coil, which is around on current transformer 20, and the both ends of primary coil are separately connected control circuit 22
Two output ends of upper alternating current；The frequency for the alternating current that the control circuit 22 exports is lower than the maximum of current transformer 20
Working frequency.
Specifically, the frequency for the alternating current that the control circuit 22 exports is 50Hz or 60Hz.
Specifically, when the primary coil is powered, size of current 6mA-30mA.
Specifically, the pitch of the laps the number of turns of the primary coil on current transformer 20 is 1 circle.
It can be seen that compare with existing earth leakage protective, the more primary coils of a leakage analog of the present embodiment are made
It with being exactly to simulate leaky, sees that can equipment be correctly detecting electric leakage, thus determines whether creepage protection function comes into force.
In the alternating current of the exportable given frequency of PA and PB two o'clock and size, (frequency is lower than current transformer to control circuit
Maximum operation frequency), primary coil may be selected 1 and arrive N circle according to different current transformer transformer ratios.It needs to connect every time
Before Live line Zero line starts to charge, primary electric leakage is all simulated by leakage analog circuit, if control circuit is able to detect that
The leaky can then connect Live line Zero line；If control circuit can not detect the leaky, illustrate earth leakage detection functions
It does not work normally, then sends warning message, and Live line Zero line is remained off, charging cannot be opened.
The pitch of the laps the number of turns of size of current and loop of electric leakage on current transformer between PA and PB codetermines
The size of secondary current, as long as being adjusted in the range of current transformer is able to detect in principle.Recommendation is adjusted to 6mA and arrives
Between 30mA, because this is the earth leakage protective value range of AC charging national regulations.
It simulates the pitch of the laps the number of turns of loop of electric leakage on current transformer and is recommended as 1 circle, that is, as zero curve and firewire
Current transformer is simply passed through, production in this way installs that cost is relatively low.
The frequency recommendation of simulation electric leakage is adjusted to frequency identical with power grid alternating current, such as 50HZ or 60HZ.
Specific embodiment of the present utility model above described embodiment only expresses, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.
Claims (4)
1. a kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function, which is characterized in that including electric current
Mutual inductor, current-to-voltage converter, the control circuit of exportable alternating current and leakage analog circuit；The current transformer
It is sheathed on firewire and zero curve, the input terminal of the output end connection current-to-voltage converter of the current transformer, the electricity
Stream-voltage changer output end connects the input terminal of control circuit, and the leakage analog circuit is primary coil, the primary line
Circle is around on current transformer, and the both ends of primary coil are separately connected two output ends of alternating current in control circuit；The control
The frequency of the alternating current of circuit output processed is lower than the maximum operation frequency of current transformer.
2. the earth leakage protective device of the electric vehicle alternating-current charging pile according to claim 1 with self-checking function, special
Sign is that the frequency of the alternating current of the control circuit output is 50Hz or 60Hz.
3. the earth leakage protective device of the electric vehicle alternating-current charging pile according to claim 1 with self-checking function, special
Sign is, when the primary coil is powered, size of current 6mA-30mA.
4. the earth leakage protective device of the electric vehicle alternating-current charging pile according to claim 1 with self-checking function, special
Sign is that the pitch of the laps the number of turns of the primary coil on current transformer is 1 circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920348744.0U CN209389686U (en) | 2019-03-19 | 2019-03-19 | A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920348744.0U CN209389686U (en) | 2019-03-19 | 2019-03-19 | A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209389686U true CN209389686U (en) | 2019-09-13 |
Family
ID=67854757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920348744.0U Active CN209389686U (en) | 2019-03-19 | 2019-03-19 | A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209389686U (en) |
-
2019
- 2019-03-19 CN CN201920348744.0U patent/CN209389686U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106463944B (en) | Method for detecting the disconnected phase condition of transformer | |
| CN102608485B (en) | Detection method for zero-sequence current loops of transformer substations | |
| CN207440195U (en) | A kind of multi-functional energizing test platform | |
| CN107300684B (en) | A kind of check method in transformer differential protection secondary circuit | |
| CN102565618A (en) | Method for detecting zero-sequence voltage circuit of transformer substation | |
| CN104330687A (en) | Method and device for detecting electricity leakage fault of power supply system | |
| CN108169606A (en) | High voltage direct current converter system simulates live detection complexes and its detection method | |
| Patel et al. | Sequence component of currents based differential protection of power transformer | |
| CN105467239A (en) | Voltage transformer excitation characteristic test system | |
| CN209389686U (en) | A kind of earth leakage protective device of the electric vehicle alternating-current charging pile with self-checking function | |
| CN204179639U (en) | Intelligent leakage circuit breaker | |
| CN111751766A (en) | Main transformer bushing current transformer polarity detection method | |
| CN102565614B (en) | Alternating voltage loop test method | |
| Wang et al. | Studies on the stator single-phase-to-ground fault protection for a high-voltage cable-wound generator | |
| CN103472389A (en) | Testing device for electric leakage reclosure breaker | |
| CN103809039A (en) | Method for testing current transformers in substation | |
| CN105911372B (en) | Magnetic flux quantity measuring method for isolation switch Phase sequence detection | |
| CA2969893C (en) | Demagnetization device and method for demagnetizing a transformer core | |
| CN213302482U (en) | Insulation monitoring circuit for completing connection of charging piles on line | |
| CN103134976A (en) | Mine circuit electrification indication device and achieving method based on magnetic circuit blocking technology | |
| CN209389691U (en) | It is a kind of can self-test electric vehicle alternating-current charging pile real-time earth leakage protective device | |
| CN205229335U (en) | Voltage transformer excitation characteristic test device | |
| CN207882364U (en) | High voltage direct current converter system simulates live detection complexes | |
| CN103454553A (en) | Secondary side phase checking device of voltage transformer | |
| CN212134830U (en) | Relay protection and automatic calibration system with analog load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |