CN206250850U - A kind of breaker - Google Patents
A kind of breaker Download PDFInfo
- Publication number
- CN206250850U CN206250850U CN201621370282.5U CN201621370282U CN206250850U CN 206250850 U CN206250850 U CN 206250850U CN 201621370282 U CN201621370282 U CN 201621370282U CN 206250850 U CN206250850 U CN 206250850U
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- current
- breaker
- voltage
- 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
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a kind of breaker, including processing unit, current transformer, power circuit and the current measurement circuit, the tension measuring circuit that are connected with processing unit respectively；The current measurement circuit includes bridge rectifier sample circuit, polarity detection circuit；The tension measuring circuit includes voltage differential circuit and frequency detection circuit；The processing unit can according to the current sampling signal of bridge rectifier sample circuit, polarity detection circuit export level signal, voltage differential circuit output and through A/D change after signal and frequency detection circuit export pulse signal, obtain major loop voltage, electric current, the detected value of power；The power circuit is used to be powered into the consuming parts in breaker of plastic casing after changing output after the rectification of bridge rectifier sample circuit.The utility model can be accurately measured parameters such as voltage, electric current and power, and has the advantages that simple structure, small volume, cost of implementation are low.
Description
Technical field
The present invention relates to a kind of breaker, belong to low-voltage electrical technical field.
Background technology
With continuing to develop for distribution technique, the continuous application of distribution network, the requirement to the function of breaker is also got over
Come higher.Breaker of plastic casing product is also continued to develop towards miniaturization, multifunction, Eco-power direction in recent years, with full
The sufficient diversified requirement of user.Such as require the electronic trip unit as breaker control core, except with long delay, short time delay,
Instantaneous overcurrent is protected, the function such as ground connection, under-voltage protection, also with electrical measurement function, in addition to current measurement, it is also desirable to have electricity
The functions such as pressure, power measurement.
The existing breaker for possessing power measurement function, the circuit needed for it realizes voltage, electric current and power measurement is general
Store-through does not meet intelligent circuit breaker miniaturization, the development trend of cost degradation in the larger problem of complex structure, volume.
The content of the invention
Technical problem to be solved in the utility model is to overcome prior art not enough, there is provided a kind of breaker, can be right
The parameters such as voltage, electric current and power are accurately measured, and with low excellent of simple structure, small volume, cost of implementation
Point.
The utility model specifically solves above-mentioned technical problem using following technical scheme：
A kind of breaker, including processing unit, current transformer, power circuit and the electricity that is connected with processing unit respectively
Flow measurement circuitry, tension measuring circuit；The current measurement circuit includes bridge rectifier sample circuit, polarity detection circuit, bridge
Formula rectification sample circuit is used to that the current signal of Current Transformer Secondary side output to be carried out rectification and carries out rectified current
Sampling, the polarity detection circuit will take from the level letter corresponding with input current waveform of bridge rectifier sample circuit input
Number deliver to processing unit；The tension measuring circuit includes voltage differential circuit and frequency detection circuit, the voltage differential electricity
Road is for will take from the A/D conversion inputs mouthful exported after the three-phase voltage signal of major loop is depressured to processing unit, institute
Frequency detection circuit is stated for being processed signal after the step-down of voltage differential circuit output to obtain corresponding to electric voltage frequency
Pulse signal；The processing unit can be exported according to the current sampling signal of bridge rectifier sample circuit, polarity detection circuit
Level signal, voltage differential circuit output and through A/D change after signal and frequency detection circuit export pulse signal,
Obtain voltage, electric current, the detected value of power of major loop；After the power circuit is used for the rectification of bridge rectifier sample circuit
Output is powered after being changed into the consuming parts in breaker of plastic casing.
Used as a kind of further improvement project, the breaker also includes residual current transformer, residual current measurement electricity
Road, detects for the residual current to major loop.
Used as another further improvement project, the current measurement circuit also includes being used for bridge rectifier sample circuit
The amplifying circuit that the current sampling signal of output is amplified.It is anti-that the amplifying circuit is preferably second order Infinite gain multiple feedback
Phase amplifying circuit.
As also include threephase switch power circuit, for the three-phase voltage of major loop to be converted into DC voltage after deliver to
The power circuit.So as to redundant power supply be formed together with can providing power supply with current transformer, the work for improving breaker can
By property.
Preferably, the current transformer is iron core transformer, and it includes：Iron core, skeleton, coil, connecting line component.Institute
State the round rectangle structure of iron core preferably silicon steel tape wrapping.
Compared to existing technology, the utility model has the advantages that：
Relative to the current measurement circuit using simple reverse amplification, the second order Infinite gain that the utility model is used
The structure of the current measurement circuit of the anti-phase amplification of multiple feedback improves the measurement precision of low side；What the utility model was used
Tension measuring circuit can simplify circuit structure, and take up room reduction, is conducive to being built in voltage measurement on intelligent controller,
It is easy to realize voltage measurement and frequency measurement function in the intelligent controller of low-voltage circuit breaker, the perfect work(of intelligent controller
Energy.The Redundancy Design that the utility model is further powered using current transformer power supply and threephase switch power supply, without outer secondary
Power supply is helped, while can also realize residual current protecting, power measurement.
Brief description of the drawings
Fig. 1 is one structural principle block diagram of preferred embodiment of the utility model；
Fig. 2 is the circuit diagram of bridge rectifier sample circuit and polarity detection circuit；
Fig. 3 is the waveform relationship figure between the output of the level state summation current transformer of polarity detection circuit output；
Fig. 4 is the circuit diagram of amplifying circuit；
Fig. 5 is the circuit diagram of difference channel；
Fig. 6 is the circuit diagram of frequency detection circuit；
Fig. 7 is the structural representation of iron core transformer, wherein, 1 is iron core, and 2 is skeleton, and 3 is coil, and 4 is connecting line group
Part, 5 is insulating barrier.
Specific embodiment
The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings：
Fig. 1 shows one structural principle of preferred embodiment of the utility model.Breaker in the present embodiment includes disconnected
Road device body and installed in intrinsic electronic trip unit, current transformer, residual current transformer and magnetic flow convertor, such as
Shown in Fig. 1, the electronic trip unit includes current measurement circuit, tension measuring circuit, power circuit, microprocessing unit circuit,
Man-machine interface, threephase switch power circuit, residual current measuring circuit, real time clock circuit, interface circuit, telecommunication circuit and
Dropout drive circuit.The current measurement circuit includes bridge rectifier sample circuit, see-saw circuit and polarity detection circuit,
The tension measuring circuit includes voltage differential circuit and frequency detection circuit, and the microprocessing unit circuit includes microcontroller
(MCU), reference circuit, reset circuit, storage circuit, crystal oscillating circuit.The man-machine interface includes button, indicator lamp and LCD liquid
Brilliant display module.Telecommunication circuit includes insulating power supply and isolation RS 485 interface chip.
The current signal of Current Transformer Secondary side output carries out current sample after bridge rectifier, while rectification output is sent
To power circuit, Isobarically Control, filtering process are carried out, and generate dropout power supply and microprocessing unit, current measurement circuit, electricity
The working power of pressure measuring circuit, residual current measuring circuit etc..Polarity detection circuit by take from rectification circuit input with it is defeated
Enter the corresponding level signal of current waveform and be sent to microcontroller to be detected.Take from the electric current of the negative bridge arm of rectifier circuit rectifies bridge
The A/D conversion inputs that microcontroller is sent to after the inverted amplification of sampled signal carry out discrete sampling.The three-phase voltage letter of major loop
Number input is sent to microcontroller A/D after being processed through difference channel step-down changes input, and the output of difference channel is sent to frequency simultaneously
Rate detection circuit obtains the pulse signal corresponding to electric voltage frequency, is sent to microcontroller and is processed.When there is residual current failure
When, the measurement signal corresponding to residual current of residual current transformer output send micro-control after being processed through residual current measuring circuit
The A/D Transformed Input Samples treatment of device processed, residual current transformer is using circular or oval.Threephase switch power circuit takes three
Phase input voltage signal, direct current power source voltage is exported after dynamic PWM closed-loop control, is sent to power circuit, summation current transformer
The self powered supply of generation realizes redundant power supply together.Reset circuit, crystal oscillating circuit ensure microcontroller normal work, benchmark electricity
Road provides datum for A/D samplings, and storage circuit preserves setup parameter, fault parameter and safeguards that information and system information etc. are interior
Hold.The operation such as set, inquired about by man-machine interface, and being shown electrical parameter, setup parameter, failure logging etc., being referred to by LED
Show operation, working condition.Real-time clock provides the time reference of system.Telecommunication circuit realizes communication with the outside world.Microcontroller is examined
Measurement signal is surveyed, when fault actions condition is met, instruction is sent to dropout drive circuit, makes magnetic flow convertor energized action,
Promoting the executing agency of breaker disconnects breaker open operation.
Fig. 2 is the physical circuit of rectification sample circuit and polarity detection circuit in the present embodiment.As shown in Fig. 2 electric current is mutual
The ac current signal of sensor output delivers to rectifier bridge D5, is output as pulsating direct current signal, rectifier bridge output connection sampling resistor
Current signal, is converted to voltage signal by Ra.Resistance R5, resistance R6, transistor V1 constitute polarity discriminating circuit, work as AC signal
During for positive half-wave,, by turning on transistor V1 after R5 current limlitings, output (PA) is low level for it, when AC signal is negative half-wave
When, transistor V1 cut-offs, output (PA) is high level, that is to say, that the output of the level state summation current transformer of PA has right
The relation (Fig. 3 is corresponding waveform relationship figure) answered, MCU corresponds to half-wave according to the level state of PA after can obtaining rectification
Situation, it before rectification is positive which half-wave distinguished to be, is negative before which halfwave rectifier, so as to before the rectification that restores
Corresponding waveform, that is to say, that the continuous half-wave fluctuating signal after rectification is reduced to all-view signal.The A/D of MCU is believed electric current
Number sampling, while sample PA level signal, when PA be high level when, current sampling signal is taken it is negative, when PA be low level when,
Current sampling signal is taken just, electric current discrete digital signal is obtained.
Fig. 4 is the see-saw circuit employed in the present embodiment, and it is the second order Infinite anti-phase amplification of gain multiple feedback
Circuit, is amplified to sampled signal, reaches signal and send after suitable amplitude MCU and carry out A/D conversion process.Resistance R8 and electricity
Hold C2 and constitute two feedback branches, the strong and weak frequency with signal of its feedback is relevant, constitute unlimited gain multiple feedback filtering
Circuit, this filter circuit will not produce self-oscillation because passband voltage gain is excessive, stable performance.It is low in order to improve
The measurement precision at end, can be by the way of wide range and small-range amplify respectively.
The existing current measurement circuit using simple reverse amplification, second order Infinite gain is used relative to the utility model
The measurement precision of the current measurement circuit low side of the anti-phase amplification of multiple feedback is poor.
Fig. 5 is the difference channel in tension measuring circuit in the present embodiment, resistance R10~R17, electric capacity C3~C6, computing
Amplifier N3A, N3B, N3C constitute three-pass DINSAR circuit, obtain corresponding to the output signal of phase voltage, the element of difference amplifier
Parameter is chosen according to R10=R12=R14=R16, R11=R13=R15=R17, C3=C4=C5=C6.Differential amplifier circuit
Output can be calculated with principle of stacking, each signal is individually put on into differential amplifier circuit, obtain corresponding defeated
Go out, finally the output of several signal independent roles is overlapped and obtains final result.By taking A phases as an example, can be by input signal
UA, UN, VREF are respectively applied to input, only add a signal, other signals to be opened a way according to voltage source short circuit current source every time
Principle is changed to original circuit, can be obtained with superposition theorem：
It is the voltage (UA-UN) between A phases and the neutral conductor (zero line) to define UAN,
Then
Ubn and Ucn can be calculated by same procedure.The wherein effect of C3~C6 is phase compensation.
The data signal that sampling is obtained is subtracted V by the A/D of MCU to voltage signal samplingREFValue, less than VREFMagnitude of voltage
It is negative value, more than VREFMagnitude of voltage be on the occasion of obtaining voltage dispersion data signal.
As it appears from the above, by after the A/D samplings of MCU, obtaining discrete electric current, voltage digital signal.Electric current, voltage signal
It is periodic signal, its cycle is T, the virtual value definition according to electric current, voltage calculates the virtual value of electric current, voltage：
According to the current effective value, voltage effective value that are calculated, apparent energy is calculated：
Apparent energy S=U*I,
According to the definition of active power, active power is calculated：
Fig. 6 is the frequency detection circuit in the present embodiment, and it is made up of resistance R18~R21, comparator IC2.By what is exported
Any road signal and VREFRelatively or by the output road signals of Ren bis- it is compared, this is with any road output signal and VREFCarry out
Compare and explain, as a example by output takes Uan, it is assumed that output original state is low level, then comparator IC2+end signalWhen, comparator IC2 output high level；Then in+end signal
When, thus comparator output low level obtains corresponding to the pulse signal of frequency input signal, and being sent to MCU carries out seizure measurement.
Identical, if taking the output of any two-way, it is also possible to which the pulse signal for obtaining corresponding to frequency input signal is sent to MCU and is caught
Catch measurement.
When residual current protecting function is needed, the utility model can also increase residual current measuring circuit to realize, lead to
Crossing the signal of detection zero sequence current mutual inductor, and send the A/D of MCU to be input into after signal condition carries out digital sample, and through computing
After obtain residual current, action command breaking circuit breaker is sent when residual current reaches setting value, realize defencive function.
Fig. 7 is the current transformer structure schematic diagram in this specific embodiment, using a kind of iron core transformer.It includes iron
Core 1, skeleton 2, coil 3, connecting line component 4 and insulating barrier 5.Iron core 1 is formed using the strong silicon steel tape wrapping of anti-saturation ability, its
Shape is rectangle with rounded corners, and the length and width of the rectangle with rounded corners after windings and winding are determined according to demand.The two of iron core 1
Opposite side respectively has a skeleton 2 matched with its shape；The outside of skeleton 2 is wound with coil 3, and coil 3 uses single enamel-covered wire
Uniform coiling is formed on skeleton 2；The head and the tail tap of coil 3 is connected to connecting line component 4；The outside of coil 3 is coated with insulating barrier
5, insulating barrier 5 can use insulating tape or plastic casing.
Claims (7)
1. a kind of breaker, including processing unit, current transformer, power circuit and the electric current being connected with processing unit respectively
Measuring circuit, tension measuring circuit；Characterized in that, the current measurement circuit includes that bridge rectifier sample circuit, polarity are examined
Slowdown monitoring circuit, bridge rectifier sample circuit be used for Current Transformer Secondary side output current signal carry out rectification and to rectification after
Electric current is sampled, and the polarity detection circuit will take from the corresponding with input current waveform of bridge rectifier sample circuit input
Level signal deliver to processing unit；The tension measuring circuit includes voltage differential circuit and frequency detection circuit, the electricity
Pressure difference parallel circuit changes input for will take from the A/D exported to processing unit after the three-phase voltage signal of major loop is depressured
Port, the frequency detection circuit is used to process signal after the step-down of voltage differential circuit output to obtain corresponding to electricity
The pulse signal of voltage-frequency rate；The processing unit can be according to the current sampling signal of bridge rectifier sample circuit, Check up polarity electricity
Road output level signal, voltage differential circuit output and through A/D change after signal and frequency detection circuit export arteries and veins
Signal is rushed, voltage, electric current, the detected value of power of major loop is obtained；The power circuit is used for bridge rectifier sample circuit
Rectification after output changed after powered into the consuming parts in breaker of plastic casing.
2. breaker as claimed in claim 1, it is characterised in that it also includes residual current transformer, residual current measurement electricity
Road, detects for the residual current to major loop.
3. breaker as claimed in claim 1, it is characterised in that the current measurement circuit is also included for being taken to bridge rectifier
The amplifying circuit that the current sampling signal of sample circuit output is amplified.
4. breaker as claimed in claim 3, it is characterised in that the amplifying circuit is that second order Infinite gain multiple feedback is anti-phase
Amplifying circuit.
5. breaker as claimed in claim 1, it is characterised in that it also includes threephase switch power circuit, for by major loop
Three-phase voltage be converted to DC voltage after deliver to the power circuit.
6. breaker as claimed in claim 1, it is characterised in that the current transformer is iron core transformer, and it includes：Iron
Core, skeleton, coil, connecting line component.
7. breaker as claimed in claim 6, it is characterised in that the iron core is the round rectangle knot of silicon steel tape wrapping
Structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621370282.5U CN206250850U (en) | 2016-12-14 | 2016-12-14 | A kind of breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621370282.5U CN206250850U (en) | 2016-12-14 | 2016-12-14 | A kind of breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206250850U true CN206250850U (en) | 2017-06-13 |
Family
ID=59007714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621370282.5U Active CN206250850U (en) | 2016-12-14 | 2016-12-14 | A kind of breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206250850U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881946A (en) * | 2021-01-15 | 2021-06-01 | 常熟开关制造有限公司(原常熟开关厂） | Double-core current transformer disconnection detection method and device and circuit breaker |
-
2016
- 2016-12-14 CN CN201621370282.5U patent/CN206250850U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881946A (en) * | 2021-01-15 | 2021-06-01 | 常熟开关制造有限公司(原常熟开关厂） | Double-core current transformer disconnection detection method and device and circuit breaker |
| CN112881946B (en) * | 2021-01-15 | 2021-09-24 | 常熟开关制造有限公司(原常熟开关厂） | Double-core current transformer disconnection detection method and device and circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101277016B (en) | Active electric filter device as well as control method | |
| EP2401805B1 (en) | A hybrid distribution transformer with an integrated voltage source converter | |
| CN102222984B (en) | On-line monitoring inductive electricity-taking device for intelligent switchgear | |
| CN208636373U (en) | Primary frequency modulation electric parameter accurately measures device | |
| CN201937474U (en) | Power supply adopting simple and practical output overvoltage protection circuit | |
| CN109270337A (en) | Passive and wireless current sensor based on double-winding current mutual inductor | |
| CN203933382U (en) | A kind of APFC of tape jam measuring ability | |
| CN206250850U (en) | A kind of breaker | |
| CN202737769U (en) | High-voltage line suspension electricity-taking apparatus | |
| CN208172088U (en) | Wisdom safety utilization of electric power monitoring detector residual current detection device | |
| CN109842183A (en) | A kind of transmission line of electricity sensing electricity getting device and its method for obtaining maximum power | |
| CN2852485Y (en) | Magnetic bias type automatic tracking and compensating device for arc-suppression coil | |
| CN103997199A (en) | Active power factor correction circuit with fault detection function | |
| CN209419207U (en) | Dc source power output limits protection circuit | |
| CN207502683U (en) | A kind of wind driven generator set converter Intelligent fault detection device | |
| CN209707592U (en) | A kind of power distribution network synchronous phasor measuring device | |
| CN205721466U (en) | A kind of intelligent precise magnet charger | |
| CN111817258B (en) | Magnetic modulation type direct current leakage protection device based on improved direct current component method | |
| CN207382206U (en) | A kind of fire-fighting equipment power supply including AC220V voltage detecting circuits | |
| CN207166123U (en) | A kind of digital reverse-power relay | |
| CN206977018U (en) | Intelligent direct-current controller applied to DC circuit Control protection system | |
| CN101478153B (en) | Pilot type control circuit | |
| CN203324343U (en) | Anti-electric-larceny single-phase electric energy meter | |
| CN107356806A (en) | A kind of current measuring device and measuring method | |
| CN204789868U (en) | Distribution cable electricity status monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |