CN110350476A - The selective earth leakage protection circuit and earth leakage protecting method of the low damage conditioning of signal - Google Patents
The selective earth leakage protection circuit and earth leakage protecting method of the low damage conditioning of signal Download PDFInfo
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- CN110350476A CN110350476A CN201910665151.1A CN201910665151A CN110350476A CN 110350476 A CN110350476 A CN 110350476A CN 201910665151 A CN201910665151 A CN 201910665151A CN 110350476 A CN110350476 A CN 110350476A
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- 230000003750 conditioning effect Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 17
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- 238000002955 isolation Methods 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
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- 230000008569 process Effects 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
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- 238000010168 coupling process Methods 0.000 claims description 2
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- 230000001681 protective effect Effects 0.000 claims 1
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- 230000001629 suppression Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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Abstract
The present invention relates to the selective earth leakage protection circuits and earth leakage protecting method of a kind of low damage conditioning of signal; including the low damage conditioning circuit of sequentially connected signal, single-phase electric energy metering circuit, core processing circuit and execution circuit; residual voltage and zero-sequence current obtain differential signal through the low damage conditioning circuit of signal; single-phase electric energy metering circuit calculates voltage effective value, current effective value, power factor, First Harmonic Reactive Power; core processing circuit obtains residual voltage virtual value, zero-sequence current virtual value, power factor, First Harmonic Reactive Power, sees if fall out setting value.The low damage conditioning circuit accurate delivery original analog of signal of the present invention, signal message retain complete；Single-phase electric energy metering circuit AD sampling precision is high, improves zero-sequence current and residual voltage signal resolution, fault identification is sensitiveer；Anti-interference ability is stronger, adapts to live adverse circumstances and uses；Earth leakage protecting method considers the case where power grid is through arc suppression coil compensation, and the scope of application is wider.
Description
Technical field:
The present invention relates to the low damage conditionings of technical field of mine safety more particularly to a kind of signal for Colliery Security System
Selective earth leakage protection circuit and earth leakage protecting method.
Background technique:
The main signal characteristic according to residual voltage and zero-sequence current of existing selective earth leakage protection.Its signal characteristic is
(1) steady state fault weak output signal, it is compensated after signal it is smaller, (2) are influenced by ground arc, and (3) are by arc suppression coil compensation
Degree influences greatly, and the interference of (4) scene is big, and signal-to-noise ratio is small, and (5) signal amplitude range is wide.Due to its signal characteristic complexity, existing choosing
The signal condition of selecting property leakage protection circuit often has the following problems: filtering depth is too deep, filters out useful transient signal, filters
The depth of convolution is spent shallowly, and signal-to-noise ratio is small；The Acquisition Circuit range of linearity is narrow, and signal is imperfect；Peak overvoltage burns out sample port；AD essence
Spend that low, signal resolution is poor.
Summary of the invention:
The low damage conditioning of signal that small, signal is strong, precision is high, signal resolution is strong is interfered it is an object of the present invention to provide a kind of
Selective earth leakage protection circuit and earth leakage protecting method.
To achieve the above object, the present invention provides a kind of signal the low selective earth leakage protection circuit for damaging conditioning, including letter
Number low damage conditioning circuit, single-phase electric energy metering circuit, core processing circuit and execution circuit；
The low High-frequency Interference damaged conditioning circuit and be used to inhibit residual voltage Yu zero sequence current signal input port of the signal
Signal；
Single-phase electric energy metering circuit damage conditioning circuit low with signal is electrically connected, for handling differential signal, meter in real time
Voltage effective value, current effective value, power factor, First Harmonic Reactive Power are calculated, and is stored in corresponding register；
The core processing circuit is electrically connected with single-phase electric energy metering circuit realizes data interaction, for filtering out isolation rear side
Data/address bus High-frequency Interference, isolation front side data/address bus High-frequency Interference, the decoupling of isolation rear side power filter, the power supply filter of isolation front side
Wave decoupling；
The execution circuit is electrically connected with core processing circuit, is used for output signal.
Preferably, the low damage conditioning circuit of the signal includes that the low damage conditioning circuit of current signal and the low damage of voltage signal are adjusted
Circuit is managed, the low damage conditioning circuit of the current signal or the low damage conditioning circuit of voltage signal include the high-voltage electricity being sequentially connected electrically
Appearance, magnetic bead, two-way transition diode, current transformer, RC low-pass filter and filter capacitor.
Preferably, the single-phase electric energy metering circuit includes single-phase electric energy metering chip, crystal oscillator starting of oscillation capacitor, metering core
Benchmark filter capacitor in piece analog power filter capacitor, metering chip digital power filter capacitor and metering chip piece, the crystalline substance
Base in vibration starting of oscillation capacitor, metering chip analog power filter capacitor, metering chip digital power filter capacitor and metering chip piece
Quasi- filter capacitor is electrically connected with single-phase electric energy metering chip respectively.
Wherein, the single-phase electric energy metering chip uses CS5463.
Preferably, the core processing circuit include CPU, RC filter circuit, digital isolator and filtering decoupling capacitor,
The CPU is electrically connected with digital isolator, and the end of incoming cables of the digital isolator and leading-out terminal have been electrically connected RC filtered electrical
Road and filtering decoupling capacitor.
Wherein, the CPU uses LPC1768.
Preferably, the execution circuit includes CPU, driving chip, optocoupler, relay driving chip, RC filter circuit
And relay contact arc extinguishing, it is electrically connected between the CPU and driving chip by RC filter circuit, the driving chip passes through light
Coupling is electrically connected with relay driving chip, and the relay driving chip is electrically connected with relay contact arc extinguishing.
Wherein, the CPU uses LPC1768.
The present invention also provides a kind of earth leakage protecting method of the low selective earth leakage protection circuit for damaging conditioning of above-mentioned signal, packets
Include following steps:
One, residual voltage and zero-sequence current obtain differential signal, differential signal difference through the low damage conditioning circuit of signal respectively
Access the corresponding interface of single-phase electric energy metering circuit；
Two, single-phase electric energy metering circuit handles differential signal in real time, calculate separately out voltage effective value, current effective value,
Power factor, First Harmonic Reactive Power, and it is stored in corresponding register；
Three, core processing circuit reads voltage effective value register, the electricity of single-phase electric energy metering circuit by data/address bus
Effective value register, power factor register, First Harmonic Reactive Power register are flowed, residual voltage virtual value, zero-sequence current are obtained
Virtual value, power factor, First Harmonic Reactive Power, see if fall out setting value；
Four, execution circuit output executes signal.
Wherein, the step 3 specifically comprises the following steps:
(1) system initialization；
(2) residual voltage virtual value, the zero-sequence current that CPU reads single-phase electric energy metering circuit by data/address bus are effective
Value, power factor, First Harmonic Reactive Power, calculating process phase difference；
(3) by process phase difference and First Harmonic Reactive Power, residual voltage and zero-sequence current phase difference are calculated；
(4) judge whether residual voltage virtual value, zero-sequence current virtual value exceed setting value, if without departing from setting value,
Then return step (2) enter in next step if exceeding setting value；
(5) judge whether zero sequence active power meets ground protection principle, if returned without departing from ground protection principle
Step (2) exports execution signal if exceeding setting value.
The present invention has the effect of following positive:
(1) the low damage conditioning circuit accurate delivery original analog of signal, signal message retain complete；
(2) single-phase electric energy metering circuit AD sampling precision is high, improves zero-sequence current and residual voltage signal resolution, therefore
Barrier identification is sensitiveer；
(3) anti-interference ability is stronger, adapts to live adverse circumstances and uses；
(4) earth leakage protecting method considers the case where power grid is through arc suppression coil compensation, and the scope of application is wider.
Detailed description of the invention:
Fig. 1 is the schematic diagram of the selective earth leakage protection circuit of the low damage conditioning of signal of the invention；
Fig. 2 is the circuit diagram of the low damage conditioning circuit of signal of the invention；
Fig. 3 is the circuit diagram of single-phase electric energy metering circuit of the invention；
Fig. 4 is the circuit diagram of core of the invention processing circuit；
Fig. 5 is the schematic diagram of the processing method of core of the invention processing circuit；
Fig. 6 is the circuit diagram of execution circuit of the invention.
Specific embodiment:
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be understood by those skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
As shown in Figure 1, a kind of low selective earth leakage protection circuit for damaging conditioning of signal, including the low damage conditioning circuit of signal,
Single-phase electric energy metering circuit, core processing circuit and execution circuit.
The low High-frequency Interference damaged conditioning circuit and be used to inhibit residual voltage Yu zero sequence current signal input port of the signal
Signal, as shown in Fig. 2, the correspondence that residual voltage signal U0 and zero sequence current signal I0 are respectively connected to the low damage conditioning circuit of signal is logical
Road, two signal common points are connected to OCOM, and the low damage conditioning circuit of signal includes that the low damage conditioning circuit of current signal and voltage signal are low
Conditioning circuit is damaged, the low damage conditioning circuit of the current signal or the low damage conditioning circuit of voltage signal include the high pressure being sequentially connected electrically
Capacitor, magnetic bead, two-way transition diode, current transformer, RC low-pass filter and filter capacitor.
High-voltage capacitance C29, C69, C12 filter out high pressure interference signal, two-way transition diode D25, D53 protection residual voltage
Internal component is damaged with zero sequence current signal input port prevention high reject signal, CT1, CT2 are high-precision, low phase shifted current
External original signal and internal sample circuit is isolated in mutual inductor, and magnetic bead FB3, FB4, FB1, FB2 inhibit the high frequency on signal wire dry
Signal is disturbed, resistance R59, R64, R92, R103 filter out high frequency with capacitor C23, C25, C11, C96 composition RC low-pass filter respectively
Signal, C60, C97 eliminate DM EMI in signal, and D27, D28 and D9, D11 prevention high voltage burn chip voltage and current terminal
Mouthful, R16, R51, R58, R101 by primary voltage type signal be converted into current mode signal access current transformer input side, R38,
After Current Transmit 1, the CT2 current mode signal exported are converted into voltage mode signals respectively by R60, R40 and R57, R56, R61
It is exported in a manner of Differential Input.Residual voltage and zero-sequence current respectively through the low damage conditioning circuit of signal obtain differential signal VIN+,
VIN- and IIN+, IIN-.VIN+, VIN-, IIN+, IIN- are respectively connected to the corresponding interface of single-phase electric energy metering circuit.
Uo and VIN ratio is definite valueIo and IIN ratio is definite value
Single-phase electric energy metering circuit damage conditioning circuit low with signal is electrically connected, for handling differential signal, meter in real time
Voltage effective value, current effective value, power factor, First Harmonic Reactive Power are calculated, and is stored in corresponding register.As shown in figure 3,
Single-phase electric energy metering circuit includes single-phase electric energy metering chip, crystal oscillator starting of oscillation capacitor, metering chip analog power filter capacitor, meter
Measure benchmark filter capacitor in chip digital power filtering capacitor and metering chip piece, the crystal oscillator starting of oscillation capacitor, metering chip mould
In quasi- power filtering capacitor, metering chip digital power filter capacitor and metering chip piece benchmark filter capacitor respectively with single-phase electricity
It can metering chip electrical connection.
C83, C85 are crystal oscillator starting of oscillation capacitors, and C76, C77 are metering chip analog power filter capacitors, and C82 is metering chip
Digital power filter capacitor, C89 is benchmark filter capacitor in metering chip piece, after metering chip digital grounding analogue ground is shorted
Altogether.
CS5463 handles differential signal VIN+, VIN- and IIN+, IIN- in real time, calculates separately out voltage effective value, electric current
Virtual value, power factor, First Harmonic Reactive Power, and it is stored in corresponding register.
The core processing circuit is electrically connected with single-phase electric energy metering circuit realizes data interaction, for filtering out isolation rear side
Data/address bus High-frequency Interference, isolation front side data/address bus High-frequency Interference, the decoupling of isolation rear side power filter, the power supply filter of isolation front side
Wave decoupling.As shown in figure 4, core processing circuit includes CPU, RC filter circuit, digital isolator and filters decoupling capacitor, it is described
CPU is electrically connected with digital isolator, the end of incoming cables of the digital isolator and leading-out terminal be electrically connected RC filter circuit and
Filter decoupling capacitor.
R15 is responsible for filtering out with C59 composition RC filter circuit is isolated rear side data/address bus High-frequency Interference, and capacitor C87, C21 are
Digital isolator U17 isolation rear side power filter decoupling, R88 is pull down resistor on data/address bus data line, and R31 and C91 are formed
RC filter circuit is responsible for filtering out isolation front side data/address bus High-frequency Interference, and capacitor C88, C95 are digital isolator U17 isolation rear sides
Power filter decoupling.
As shown in figure 5, CPU is posted by voltage effective value register, the current effective value that SPI data/address bus reads CS5463
Storage, power factor register, First Harmonic Reactive Power register obtain residual voltage virtual value Urms, zero-sequence current virtual value
Irms, power factor λ, First Harmonic Reactive Power Q.Residual voltage U is calculated by following formula0Value Ur, zero-sequence current Io value Ir
With the two phase difference
UrmsWith the ratio and I of VINrmsRatio with IIN is definite value C=0.25.
Residual voltage UrCalculation formula is
Zero-sequence current IrCalculation formula is
CPU readout power factor register, First Harmonic Reactive Power register obtain power factor λ, First Harmonic Reactive Power Q,
If process phase difference isResidual voltage and zero-sequence current phase differenceCalculation formula is
As λ > 0
As λ < 0
As Q > 0
As Q < 0
Judge whether residual voltage virtual value, zero-sequence current virtual value exceed setting value, if weighed without departing from setting value
It is new to read residual voltage virtual value, zero-sequence current virtual value, power factor, First Harmonic Reactive Power, if exceeding setting value, sentence
Whether disconnected zero sequence active power meets ground protection principle, if re-reading residual voltage without departing from ground protection principle
Virtual value, zero-sequence current virtual value, power factor, First Harmonic Reactive Power, if exceeding setting value, working for starting circuit.
The execution circuit is electrically connected with core processing circuit, is used for output signal.As shown in fig. 6, execution circuit includes
CPU, driving chip, optocoupler, relay driving chip, RC filter circuit and relay contact arc extinguishing, the CPU and driving chip
Between be electrically connected by RC filter circuit, the driving chip is electrically connected by optocoupler with relay driving chip, the relay
Device driving chip is electrically connected with relay contact arc extinguishing.
Q8, R1, D1, R4, C2 prevent chip U1 mistake output in power up, the composition RC filter circuit of R5 and 26 from preventing high frequency
Interference, optocoupler U18 are signal output isolation, and U23 is relay driving chip, R7, C7 relay contact arc extinguishing.
The earth leakage protecting method of the low selective earth leakage protection circuit for damaging conditioning of above-mentioned signal, includes the following steps:
One, residual voltage and zero-sequence current obtain differential signal, differential signal difference through the low damage conditioning circuit of signal respectively
Access the corresponding interface of single-phase electric energy metering circuit；
Two, single-phase electric energy metering circuit handles differential signal in real time, calculate separately out voltage effective value, current effective value,
Power factor, First Harmonic Reactive Power, and it is stored in corresponding register；
Three, core processing circuit reads voltage effective value register, the electricity of single-phase electric energy metering circuit by data/address bus
Effective value register, power factor register, First Harmonic Reactive Power register are flowed, residual voltage virtual value, zero-sequence current are obtained
Virtual value, power factor, First Harmonic Reactive Power, see if fall out setting value；
Four, execution circuit output executes signal.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.
Claims (10)
1. a kind of low selective earth leakage protection circuit for damaging conditioning of signal, it is characterised in that: including the low damage conditioning circuit of signal, list
Phase ic for energy metering, core processing circuit and execution circuit；
The low high-frequency interferencing signal for damaging conditioning circuit and being used to inhibit residual voltage Yu zero sequence current signal input port of the signal；
Single-phase electric energy metering circuit damage conditioning circuit low with signal is electrically connected, and for handling differential signal in real time, is calculated
Voltage effective value, current effective value, power factor, First Harmonic Reactive Power, and it is stored in corresponding register；
The core processing circuit is electrically connected with single-phase electric energy metering circuit realizes data interaction, for filtering out isolation rear side data
Bus High-frequency Interference, isolation front side data/address bus High-frequency Interference, the decoupling of isolation rear side power filter, isolation front side power filter are gone
Coupling；
The execution circuit is electrically connected with core processing circuit, is used for output signal.
2. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 1, it is characterised in that: the signal
Low damage conditioning circuit includes the low damage conditioning circuit of current signal and the low damage conditioning circuit of voltage signal, and the low damage of the current signal is adjusted
It manages circuit or the low damage conditioning circuit of voltage signal includes the high-voltage capacitance being sequentially connected electrically, magnetic bead, two-way transition diode, electric current
Mutual inductor, RC low-pass filter and filter capacitor.
3. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 1, it is characterised in that: described single-phase
Ic for energy metering includes single-phase electric energy metering chip, crystal oscillator starting of oscillation capacitor, metering chip analog power filter capacitor, metering core
Benchmark filter capacitor in piece number power filtering capacitor and metering chip piece, the crystal oscillator starting of oscillation capacitor, metering chip simulation electricity
In source filter capacitor, metering chip digital power filter capacitor and metering chip piece benchmark filter capacitor respectively with single-phase electric energy meter
Measure chip electrical connection.
4. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 3, it is characterised in that: described single-phase
Electric energy computation chip uses CS5463.
5. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 1, it is characterised in that: the core
Processing circuit includes that CPU, RC filter circuit, digital isolator and filtering decoupling capacitor, the CPU are electrically connected with digital isolator
It connects, the end of incoming cables of the digital isolator and leading-out terminal have been electrically connected RC filter circuit and filtering decoupling capacitor.
6. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 5, it is characterised in that: the CPU
Using LPC1768.
7. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 1, it is characterised in that: the execution
Circuit includes CPU, driving chip, optocoupler, relay driving chip, RC filter circuit and relay contact arc extinguishing, the CPU with
It being electrically connected between driving chip by RC filter circuit, the driving chip is electrically connected by optocoupler with relay driving chip,
The relay driving chip is electrically connected with relay contact arc extinguishing.
8. the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 7, it is characterised in that: the CPU
Using LPC1768.
9. a kind of earth leakage protective of the selective earth leakage protection circuit improved such as the low damage of the described in any item signals of claim 1-8
Method, which comprises the steps of:
One, residual voltage and zero-sequence current obtain differential signal through the low damage conditioning circuit of signal respectively, and differential signal is respectively connected to
The corresponding interface of single-phase electric energy metering circuit；
Two, single-phase electric energy metering circuit handles differential signal in real time, calculates separately out voltage effective value, current effective value, power
Factor, First Harmonic Reactive Power, and it is stored in corresponding register；
Three, core processing circuit has by voltage effective value register, the electric current that data/address bus reads single-phase electric energy metering circuit
Valid value register, power factor register, First Harmonic Reactive Power register, it is effective to obtain residual voltage virtual value, zero-sequence current
Value, power factor, First Harmonic Reactive Power, see if fall out setting value；
Four, execution circuit output executes signal.
10. the earth leakage protecting method of the low selective earth leakage protection circuit for damaging conditioning of signal according to claim 9, special
Sign is that the step 3 specifically comprises the following steps:
(1) system initialization；
(2) CPU reads residual voltage virtual value, the zero-sequence current virtual value, function of single-phase electric energy metering circuit by data/address bus
Rate factor, First Harmonic Reactive Power, calculating process phase difference；
(3) by process phase difference and First Harmonic Reactive Power, residual voltage and zero-sequence current phase difference are calculated；
(4) judge whether residual voltage virtual value, zero-sequence current virtual value exceed setting value, if returned without departing from setting value
It returns step (2), if exceeding setting value, enters in next step；
(5) judge whether zero sequence active power meets ground protection principle, if without departing from ground protection principle, return step
(2), if exceeding setting value, execution signal is exported.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992870A (en) * | 2019-12-24 | 2020-04-10 | 昆山国显光电有限公司 | Drive chip and display device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1138874A1 (en) * | 1983-07-29 | 1985-02-07 | Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Институт Горного Дела Им.А.А.Скочинского | Device for protecting against earth leakage in isolated neutral system |
| CN102655321A (en) * | 2012-02-20 | 2012-09-05 | 太原理工大学 | Motor fault protection device of motor |
| CN102944813A (en) * | 2012-11-20 | 2013-02-27 | 中国石油大学(华东) | Resonant grounding system fault line selection method based on reactive power flow directions |
| CN204613275U (en) * | 2015-05-29 | 2015-09-02 | 湖南工程学院 | A kind of insert row based on WIFI control with electric energy billing function |
| CN106199341A (en) * | 2016-08-31 | 2016-12-07 | 山东电安电气有限公司 | Faulty line recognition methods under a kind of single-phase fault ground connection operating mode and device |
| CN107526010A (en) * | 2017-09-30 | 2017-12-29 | 南京国电南自电网自动化有限公司 | A kind of distributed small current earthing wire-selecting method based on double CT samplings |
| CN107528388A (en) * | 2017-09-19 | 2017-12-29 | 中国计量大学 | Lump type smart home electricity consumption management in details system |
| CN207601164U (en) * | 2017-12-28 | 2018-07-10 | 江苏昂内斯电力科技股份有限公司 | Electric safety system residual current monitoring module |
| WO2019007349A1 (en) * | 2017-07-05 | 2019-01-10 | 长沙理工大学 | Safe operation method for voltage reduction and arc suppression of ground fault phase of non-effective grounding system |
| CN210142899U (en) * | 2019-07-23 | 2020-03-13 | 天地（常州）自动化股份有限公司 | Selective leakage protection circuit with low-loss signal conditioning |
-
2019
- 2019-07-23 CN CN201910665151.1A patent/CN110350476B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1138874A1 (en) * | 1983-07-29 | 1985-02-07 | Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Институт Горного Дела Им.А.А.Скочинского | Device for protecting against earth leakage in isolated neutral system |
| CN102655321A (en) * | 2012-02-20 | 2012-09-05 | 太原理工大学 | Motor fault protection device of motor |
| CN102944813A (en) * | 2012-11-20 | 2013-02-27 | 中国石油大学(华东) | Resonant grounding system fault line selection method based on reactive power flow directions |
| CN204613275U (en) * | 2015-05-29 | 2015-09-02 | 湖南工程学院 | A kind of insert row based on WIFI control with electric energy billing function |
| CN106199341A (en) * | 2016-08-31 | 2016-12-07 | 山东电安电气有限公司 | Faulty line recognition methods under a kind of single-phase fault ground connection operating mode and device |
| WO2019007349A1 (en) * | 2017-07-05 | 2019-01-10 | 长沙理工大学 | Safe operation method for voltage reduction and arc suppression of ground fault phase of non-effective grounding system |
| CN107528388A (en) * | 2017-09-19 | 2017-12-29 | 中国计量大学 | Lump type smart home electricity consumption management in details system |
| CN107526010A (en) * | 2017-09-30 | 2017-12-29 | 南京国电南自电网自动化有限公司 | A kind of distributed small current earthing wire-selecting method based on double CT samplings |
| CN207601164U (en) * | 2017-12-28 | 2018-07-10 | 江苏昂内斯电力科技股份有限公司 | Electric safety system residual current monitoring module |
| CN210142899U (en) * | 2019-07-23 | 2020-03-13 | 天地（常州）自动化股份有限公司 | Selective leakage protection circuit with low-loss signal conditioning |
Non-Patent Citations (1)
| Title |
|---|
| 高赟: "一种选择性漏电保护器的研制", 仪器仪表学报, vol. 29, no. 4, pages 458 - 459 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110992870A (en) * | 2019-12-24 | 2020-04-10 | 昆山国显光电有限公司 | Drive chip and display device |
| US11776455B2 (en) | 2019-12-24 | 2023-10-03 | Kunshan Go-Visionox Opto-Electronics Co., Ltd | Driving chip and display apparatus |
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