CN209087566U - A kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal - Google Patents
A kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal Download PDFInfo
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- CN209087566U CN209087566U CN201822005820.6U CN201822005820U CN209087566U CN 209087566 U CN209087566 U CN 209087566U CN 201822005820 U CN201822005820 U CN 201822005820U CN 209087566 U CN209087566 U CN 209087566U
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Abstract
The utility model relates to a kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal, it further include that the multistage sampling resistance protection circuit for being connected to secondary winding both ends and sampling resistor adjust access device including first winding, iron core and the secondary winding being wound on iron core；The sampling resistor adjusts sampling resistor and the toggle switch for the sampling resistor of different resistance values to be connected to secondary winding that access device includes a variety of resistance values.For the application using small iron core is lightly loaded, saturation multiple is high, Hz-KHz is wide, measurement range is big, the linearity is good, and protective device action message can be made under system fault condition, eliminates the significant trouble hidden danger in Operation of Electric Systems, has ensured personnel and equipment safety.
Description
Technical field
The utility model relates to intelligent sensing technology fields, especially a kind of multiduty used in low-voltage distribution network current sense
A kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal.
Background technique
According to national grid construction Long-and Medium-term Development planning, exploitation for a long time monitors system running state automatically, is diagnosed
It is that urban and rural power grids are marched toward automation with the optical, mechanical and electronic integration equipment of protection, the intelligent development level for promoting high-voltage switch gear
An urgent demand, and developing direction of the power grid to digitlization, intelligence, automation now.Accelerate exploitation once electric as system
The electronic type current sensor for measuring acquisition unit is especially aobvious urgent, this is also Automation of Electric Systems, the needs of digital development.With
Smart grid development, intelligent apparatus is increasingly used in power equipment, especially electronic mutual inductor Related product,
Realize certain engineer application.For electronic current mutual inductor product, the side of the low-power coil used in the production process
Case is converted into low current signal by high current signal, then is converted into voltage letter through excessive power sampling resistor by low current signal
Number.There are many application scenarios of electronic current mutual inductor and purposes at present, there is coordinated scheme and ring network cabinet of pole-mounted circuit breaker etc.
Coordinated scheme also has applied to defencive function, but in addition, having applied to measurement function since application scenarios difference causes
Electronic current mutual inductor cannot be general, mustn't be customized for specific use environment and purposes so that production efficiency and
It is larger to promote difficulty, restricts the development of electronic current mutual inductor.Additionally, due to the various faults of use environment, it will lead to and set
Standby damage.
Summary of the invention
To solve this problem, it is necessary to it is mutual to research and develop a kind of adjustable more protection 10kV electronic currents of secondary voltage signal
Sensor, designs the sampling resistor of multi gear position, and carries out more guard technology designs, is required, is converted according to use environment
It meets the requirements, improves the production and producing efficiency of equipment.
In order to provide being more widely applied of electronic current mutual inductor, convenient and safety, the utility model
A kind of secondary output voltage signal is adjustable, the electronic current mutual-inductance apparatus of multiple-protection sampling resistor, including first winding, iron
The heart and the secondary winding being wound on iron core further include multistage sampling resistance protection circuit and the sampling for being connected to secondary winding both ends
Resistance adjustment access device；The sampling resistor adjusts the sampling resistor that access device includes a variety of resistance values and for will be different
The toggle switch of the sampling resistor connection secondary winding of resistance value.
Electric current is excessive and burn out device when the multistage sampling resistance protection circuit is avoided due to short trouble, specifically
Are as follows:
The first order protects circuit to include the first current-limiting resistance and gas-discharge tube, the first current-limiting resistance and gas-discharge tube string
Connection is followed by the both ends of secondary winding；
It includes the second current-limiting resistance, the first current-limiting inductance and varistor that circuit is protected in the second level；Second current-limiting resistance,
First current-limiting inductance and varistor series connection are followed by the both ends of gas-discharge tube；
It includes third current-limiting resistance, the second current-limiting inductance and Transient Suppression Diode that the third level, which protects circuit,；Third limit
Leakage resistance, the second current-limiting inductance and Transient Suppression Diode series connection are followed by the both ends of varistor, the sampling of different resistance values
Resistance is connected to Transient Suppression Diode both ends through toggle switch.
The toggle switch model is SS-12D06, each pin of toggle switch connects a sampling resistor, from
And it controls and which sampling resistor is connected to Transient Suppression Diode both ends.
All sampling resistors and toggle switch are encapsulated in the coil of electronic mutual inductor, while facilitating adjusting,
Also it avoids breaking Primary Component.
The application directly exports small voltage signal, good with secondary device signal compatibility, does not need other signals conversion and sets
The standby signal that carries out converts again, simplifies system structure, reduces error source.
The application is using small iron core is lightly loaded, and saturation multiple is high, Hz-KHz is wide, measurement range is big, the linearity is good, in system
It can make protective device action message under malfunction.
The application signal output external connection end open circuit will not generate overvoltage, eliminate the significant trouble in Operation of Electric Systems
Hidden danger has ensured personnel and equipment safety.
The application realizes the three-in-one compatible signal output of protection/metering/measurement of three-phase phase-sequence electric current and individual event simultaneously
It is grounded (zero sequence) protection signal output, is the ideal chose of electronic current mutual inductor in power distribution automation application.
The application function is more, small in size, light-weight, low energy consumption, reduces ferromagnetic pollution.
Detailed description of the invention
Fig. 1 is the schematic diagram of electronic current mutual inductor；
Fig. 2 is multistage sampling resistance protection circuit schematic diagram；
Specific embodiment
Compared with existing e-book mutual inductor manufacturing technology, scheme that the sampling resistor of the utility model is adjustable has flexibility
It is good, using wide advantage, it can substantially save design cost.
To make the above-mentioned purpose of the utility model, feature and a little can be more obvious and easy to understand, below to the utility model
It further mutually describes in detail bright:
Working principle is as shown in Figure 1, using low-power coil (LPCT) principle, poured with epoxy resin.Electronic current is mutual
Sensor by first winding Np (one circle of punching), high performance small iron core, the secondary winding Ns being wound on small iron core and with it is secondary
Winding Ns and the sampling resistor Rs connect composition.Sampling resistor Rs is the device that low current signal in coil is converted into voltage signal
Part, and loop conducting is formed, therefore signal output external connection end S1, S2 open circuit will not generate overvoltage, eliminate electric system fortune
Significant trouble hidden danger in row, has ensured personnel and equipment safety.The size of sampling resistor Rs resistance value decides output voltage
The size of signal Us, therefore design sampling resistor and adjust access device, high-power sampling resistor and dial-up including a variety of resistance values are opened
It closes, wherein all sampling resistors and toggle switch are encapsulated in the coil of electronic mutual inductor, is connected by toggle switch
The output of different voltages amplitude may be implemented in the sampling resistor of different resistance values.
Wherein Us is output voltage signal size, and Ip is once winding current；Rs is sampling resistor resistance value；N1 be once around
Group the number of turns, N2 are secondary winding the number of turns.
In order to sufficiently improve the accuracy rating of LPCT itself, high-quality core material is generally selected as far as possible.Increase coil
Secondary the number of turns reduces secondary winding electric current, and reduces sampling resistor resistance value, reaches raising LPCT survey to mitigate the load of coil
Measure the purpose of accuracy.This results in the iron core of LPCT not all to be saturated in very wide primary current variation range.In this way,
In the case where overcurrent, tens times even more than 100 times of rated current will be flowed through in the secondary side and sampling resistor of coil
The probability that value burns out the sampling resistor of LPCT and secondary winding increases.
Sampling resistor, which burns out, in order to prevent can take two kinds of measures: the first is to increase resistor power: be for second
Shunting measure is taken when overcurrent to reduce the electric current for flowing through sample resistance.The method for increasing resistor power is not one fine
Solution.Shunt method is inherently a protection circuit, when overcurrent, protects circuit operation.To shunt with
Realize the protection purpose to sampling resistor.Multistage sampling resistance protection circuit is as shown in Figure 2:
The first order protects circuit to include the first current-limiting resistance R1 and gas-discharge tube, the first current-limiting resistance R1 and gas discharge
Pipe series connection is followed by the both ends of secondary winding；When the voltage on gas-discharge tube is more than certain amplitude, device becomes short-circuit shape
State.To which surge energy be released.Gas-discharge tube is by being encapsulated in separated by a distance two in cuvette or ceramic tube
A electrode composition.In case of voltge surge, certain electric arc can be generated between electrode.The path of ionized gas electric discharge is by high impedance
Turn to Low ESR.The discharge process prevents a higher impact amplitude.
It includes the second current-limiting resistance R2, the first current-limiting inductance L1 and varistor that circuit is protected in the second level；Second current limliting
Resistance R2, the first current-limiting inductance L1 and varistor series connection are followed by the both ends of gas-discharge tube；Varistor be it is a kind of with
Zinc oxide metal-oxide semiconductor (MOS) nonlinear resistance as the main component.When the voltage on varistor is more than certain amplitude
When, the resistance value of varistor reduces rapidly, so that surge energy be released and the amplitude of surge voltage is limited in certain model
In enclosing, achieve the purpose that protection equipment below.Receiving capacity of the varistor under overvoltage impact is less than gas-discharge tube, can be with
Second level energy vent unit as protection circuit.
It includes third current-limiting resistance R3, the second current-limiting inductance L2 and Transient Suppression Diode TVS that the third level, which protects circuit,；
Third current-limiting resistance R3, the second current-limiting inductance L2 and Transient Suppression Diode TVS series connection are followed by the both ends of varistor, no
Sampling resistor Rs with resistance value is connected to the both ends Transient Suppression Diode TVS through toggle switch.The toggle switch model is
Each pin of SS-12D06, toggle switch connect a sampling resistor.
When the voltage on Transient Suppression Diode TVS is more than certain amplitude, Transient Suppression Diode TVS will be with high
Speed change direct impedance, device is connected rapidly.To which energy be released, and the amplitude of surge voltage is clamped in one
Predetermined value.The device in rear class circuit is effectively protected from the damage of various surge pulses.Transient Suppression Diode TVS response
Speed is fast, but its energy born is lower, can be used as the protection quick pressure limiting module of circuit.
Claims (4)
1. a kind of secondary voltage signal it is adjustable protect electronic current mutual-inductance apparatus, including first winding, iron core and be wound on
Secondary winding on iron core, it is characterised in that further include being connected to the multistage sampling resistance protection circuit at secondary winding both ends and adopting
Sample resistance adjustment access device；The sampling resistor adjusts the sampling resistor that access device includes a variety of resistance values and for will not
With the toggle switch of the sampling resistor connection secondary winding of resistance value.
2. a kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal according to claim 1, special
Sign is multistage sampling resistance protection circuit specifically:
It includes the first current-limiting resistance and gas-discharge tube that the first order, which protects circuit, after the first current-limiting resistance and gas-discharge tube are connected
It connects at the both ends of secondary winding；
It includes the second current-limiting resistance, the first current-limiting inductance and varistor that circuit is protected in the second level；Second current-limiting resistance, first
Current-limiting inductance and varistor series connection are followed by the both ends of gas-discharge tube；
It includes third current-limiting resistance, the second current-limiting inductance and Transient Suppression Diode that the third level, which protects circuit,；Third current limliting electricity
Resistance, the second current-limiting inductance and Transient Suppression Diode series connection are followed by the both ends of varistor, the sampling resistor of different resistance values
Transient Suppression Diode both ends are connected to through toggle switch.
3. a kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal according to claim 1, special
Sign is: the toggle switch model is SS-12D06.
4. a kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal according to claim 1, special
Sign is: all sampling resistors and toggle switch are encapsulated in the coil of electronic mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822005820.6U CN209087566U (en) | 2018-11-30 | 2018-11-30 | A kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822005820.6U CN209087566U (en) | 2018-11-30 | 2018-11-30 | A kind of adjustable more protection electronic current mutual-inductance apparatus of secondary voltage signal |
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| CN209087566U true CN209087566U (en) | 2019-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755011A (en) * | 2018-11-30 | 2019-05-14 | 山东电工电气集团新能科技有限公司 | The adjustable more protection electronic current mutual inductors of secondary voltage signal |
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2018
- 2018-11-30 CN CN201822005820.6U patent/CN209087566U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755011A (en) * | 2018-11-30 | 2019-05-14 | 山东电工电气集团新能科技有限公司 | The adjustable more protection electronic current mutual inductors of secondary voltage signal |
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