CN109038517A - A kind of online prevention and control device of single-phase insulated electric fire and method - Google Patents
A kind of online prevention and control device of single-phase insulated electric fire and method Download PDFInfo
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- CN109038517A CN109038517A CN201810892435.XA CN201810892435A CN109038517A CN 109038517 A CN109038517 A CN 109038517A CN 201810892435 A CN201810892435 A CN 201810892435A CN 109038517 A CN109038517 A CN 109038517A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002265 prevention Effects 0.000 title claims abstract description 18
- 230000003750 conditioning effect Effects 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 238000009413 insulation Methods 0.000 claims abstract description 27
- 238000011897 real-time detection Methods 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims 1
- 206010000369 Accident Diseases 0.000 abstract description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
-
- H02J13/0062—
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- Emergency Protection Circuit Devices (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention discloses a kind of online prevention and control device of single-phase insulated electric fire and methods, including controlling output unit, one-chip computer module, DSP unit, for real-time detection and conditioning by the residual current signal detection of the lump residual current signal in protection single phase ac circuit and conditioning unit and for real-time detection and improves the voltage signal detection by the phase voltage signal in protection single phase ac circuit and conditioning unit, wherein, residual current signal detection is connected with the input terminal of DSP unit with the output end of conditioning unit and voltage signal detection with the output end of conditioning unit, the output end of DSP unit is connected with the input terminal of one-chip computer module, the output end of one-chip computer module is connected with control output unit, the device and method can monitor the insulation performance in single phase ac circuit on-line, on-line identification is potentially electric Gas fire hazard effectively prevents the generation of ground short circuit failure and electrical fire accident.
Description
Technical field
The invention belongs to electrical fire prevention and control field, it is related to a kind of online prevention and control device of single-phase insulated electric fire and side
Method.
Background technique
Cable and load isolation layer insulation performance drop in the single phase ac distribution system of effective grounding, in current supply circuit
Low, insulation against ground resistance amplitude decline will lead to ground short circuit failure and even cause electrical fire danger, threaten the life of the people
Life and property safety.
Currently known single-phase insulated electric fire preventing control method has circuit residual current method and megameter method.Circuit is surplus
Aftercurrent method is by monitoring single phase ac loop collection total surplus current effective value I on-lineZSize it is exhausted to judge current loop
Edge performance quality, but lump residual current virtual value IZBoth the resistive remaining electricity comprising being formed by current loop insulation against ground resistance
Flow component virtual value IR, and include the capacitive residual current component virtual value I formed by current loop direct-to-ground capacitanceC, wherein only having
Resistive residual current component virtual value IRCharacterize the ground insulation performance of current loop, this method because can not separation and Extraction it is single-phase
Loop collection total surplus current effective value IZIn resistive residual current component virtual value IRAnd it cannot be to the insulation resistance of current loop
Resistance value R1It is accurately measured, there is the wrong reports to ground short circuit failure and the danger of potential electrical fire to fail to report defect.Megaohm
Table method be using megameter instrument, it is current when measuring to carrying out the measurement of insulation resistance off-line type after being tested single-phase circuit power-off
The insulation resistance resistance value R in circuit1Less than insulation resistance lower limit alarm threshold value R0(press construction site actual conditions or concerned countries mark
Standard is set) when, then it is assumed that there are ground short circuit failures and the danger of potential electrical fire, and such method exists can not be online
Monitor the potential electrical fire danger disadvantage of current loop insulation performance and its initiation.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, provides a kind of single-phase insulated electric fire and exist
Line prevention and control device and method, the device and method can monitor the insulation performance in single phase ac circuit on-line, and on-line identification is potential
Electrical fire it is dangerous, effectively prevent the generation of ground short circuit failure and electrical fire accident.
In order to achieve the above objectives, the single-phase online prevention and control device of insulated electric fire of the present invention includes control output
Unit, one-chip computer module, DSP unit, for real-time detection and improve by the lump residual current in protection single phase ac circuit
The residual current signal detection of signal is with conditioning unit and for real-time detection and improves by protection single phase ac circuit
The voltage signal of phase voltage signal detects and conditioning unit, wherein the output end of residual current signal detection and conditioning unit and
Voltage signal detection is connected with the input terminal of DSP unit with the output end of conditioning unit, the output end and monolithic of DSP unit
The input terminal of machine module is connected, and the output end of one-chip computer module is connected with control output unit.
The residual current signal detection and conditioning unit include for real-time detection by protection single phase ac circuit Zhong Ji
The residual current signal detection module of total surplus current signal and for by protection single phase ac circuit collect total surplus electricity
The residual current signal conditioning circuit module that stream signal is improved.
The residual current signal detection module is residual current transformer, the residual current signal conditioning circuit module
It is formed by being sequentially connected the I/V connect conversion, RC filter circuit, amplifying circuit and amplitude limiter circuit.
Voltage signal detection includes being believed for real-time detection by the phase voltage in protection single phase ac circuit with conditioning unit
Number voltage signal detection module and for the voltage improved by the phase voltage signal in protection single phase ac circuit
Signal conditioning circuit module.
The voltage signal detection module is voltage transformer, and the voltage signal conditioning circuit module is connect by being sequentially connected
I/V conversion, RC filter circuit, amplifying circuit and amplitude limiter circuit composition.
It further include the ethernet communication unit being connected with one-chip computer module, reset circuit module and alarm unit, monolithic
Machine module is connected by ethernet communication unit with host computer.
One-chip computer module is connected by photoelectric coupler module with alarm unit and control output unit.
The single-phase online preventing control method of insulated electric fire of the present invention the following steps are included:
1) residual current signal detection and conditioning unit real-time detection and conditioning are by the lump in protection single phase ac circuit
Residual current signal；Voltage signal detection is with conditioning unit real-time detection and conditioning is by the phase voltage in protection single phase ac circuit
Signal；DSP unit is calculated by the virtual value I of lump residual current signal in protection single phase ac circuitZAnd by protection blow-up
The virtual value U of phase voltage signal in road is flowed back to, then calculates phase angle difference between the two
2) one-chip computer module is according to by the virtual value I of lump residual current signal in protection single phase ac circuitZ, protected
The virtual value U of phase voltage signal and phase angle difference between the two in single phase ac circuitOnline separation and Extraction is single by protection
The virtual value I of lump residual current signal in phase ac circuitZInterior resistive residual current component virtual value IR, then calculate and protected
Protect the insulation resistance resistance value R in single phase ac circuit1, when by the insulation resistance resistance value R in protection single phase ac circuit1Less than default report
Alert threshold value R0When, then alarm command is exported after postponing the t time to alarm unit, while it is single to control output to export control instruction
Member, alarm unit issue sound-light alarm according to the alarm command and indicate, control output unit is generated according to the control instruction
Disjunction is made to be protected by the control signal in protection single phase ac circuit, and according to disjunction by the control signal in protection single phase ac circuit
Protect the disjunction of single phase ac circuit.
By the insulation resistance resistance value R in protection single phase ac circuit1Are as follows:
The invention has the following advantages:
The online prevention and control device of single-phase insulated electric fire of the present invention and method are when specific operation, by real-time
Detection is separated and extracted single-phase by protection by the lump residual current signal and phase voltage signal in protection single phase ac circuit
The virtual value I of lump residual current signal in ac circuitZInterior resistive residual current component virtual value IR, with accurately calculate by
Protect the insulation resistance resistance value R in single phase ac circuit1, avoid the ground connection for destroying initiation by insulation performance to single phase ac circuit short
Road failure and potential electrical fire are dangerous to be failed to report and reports by mistake, when by the insulation resistance resistance value R in protection single phase ac circuit1It is less than
Preset alarm threshold value R0When, then control instruction is issued after postponing the t time and gives control output unit, controls output unit further according to control
System instruction generates disjunction by the control signal in protection single phase ac circuit, to effectively prevent ground short circuit failure and electrical fire
The generation of accident.In addition, it is necessary to explanation, the present invention in operation, can guarantee the peace of electricity system without power-off
Entirely, manpower and material resources are saved.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Wherein, 1 it is residual current signal detection module, 2 be residual current signal conditioning circuit module, 3 is voltage signal
Detection module, 4 be voltage signal conditioning circuit module, 5 be reset circuit module, 6 be one-chip computer module, 7 be photoelectrical coupler
Module, 8 be DSP unit, 9 be ethernet communication unit, 10 be alarm unit, 11 be control output unit.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
As shown in Figure 1, the single-phase online prevention and control device of insulated electric fire of the present invention includes control output unit
11, one-chip computer module 6, DSP unit 8, for real-time detection and improve by the lump residual current in protection single phase ac circuit
The residual current signal detection of signal is with conditioning unit and for real-time detection and improves by protection single phase ac circuit
The voltage signal of phase voltage signal detects and conditioning unit, wherein the output end of residual current signal detection and conditioning unit and
Voltage signal detection is connected with the input terminal of DSP unit 8 with the output end of conditioning unit, the output end and list of DSP unit 8
The input terminal of piece machine module 6 is connected, and the output end of one-chip computer module 6 is connected with control output unit 11.
The residual current signal detection and conditioning unit include for real-time detection by protection single phase ac circuit Zhong Ji
The residual current signal detection module 1 of total surplus current signal and for by protection single phase ac circuit collect total surplus electricity
The residual current signal conditioning circuit module 2 that stream signal is improved, wherein the residual current signal detection module 1 is surplus
Aftercurrent mutual inductor, the residual current signal conditioning circuit module 2 is by being sequentially connected the I/V connect conversion, RC filter circuit, putting
Big circuit and amplitude limiter circuit composition.
Voltage signal detection includes being believed for real-time detection by the phase voltage in protection single phase ac circuit with conditioning unit
Number voltage signal detection module 3 and for the voltage improved by the phase voltage signal in protection single phase ac circuit
Signal conditioning circuit module 4, wherein the voltage signal detection module 3 is voltage transformer, the voltage signal conditioning circuit
Module 4 is formed by being sequentially connected the I/V connect conversion, RC filter circuit, amplifying circuit and amplitude limiter circuit.
The invention also includes the ethernet communication unit 9 being connected with one-chip computer module 6, reset circuit module 5 and alarms
Unit 10, one-chip computer module 6 are connected by ethernet communication unit 9 with host computer, wherein one-chip computer module 6 passes through photoelectricity
Coupler Module 7 is connected with alarm unit 10 and control output unit 11.
One-chip computer module 6 by ethernet communication unit 9 by by the real-time insulating resistance value in protection single phase ac circuit and
Fault message is uploaded to host computer；Alarm unit 10 uses buzzer or indicator light.
The single-phase online preventing control method of insulated electric fire of the present invention the following steps are included:
1) residual current signal detection and conditioning unit real-time detection and conditioning are by the lump in protection single phase ac circuit
Residual current signal；Voltage signal detection is with conditioning unit real-time detection and conditioning is by the phase voltage in protection single phase ac circuit
Signal；DSP unit 8 is calculated by the virtual value I of lump residual current signal in protection single phase ac circuitZAnd by protection blow-up
The virtual value U of phase voltage signal in road is flowed back to, then calculates phase angle difference between the two
2) one-chip computer module 6 is according to by the virtual value I of lump residual current signal in protection single phase ac circuitZ, protected
Protect the virtual value U and phase angle difference between the two of phase voltage signal in single phase ac circuitOnline separation and Extraction is protected
The virtual value I of lump residual current signal in single phase ac circuitZInterior resistive residual current component virtual value IR, then calculate quilt
Protect the insulation resistance resistance value R in single phase ac circuit1, when by the insulation resistance resistance value R in protection single phase ac circuit1Less than default
Alarm threshold value R0When, then alarm command is exported after postponing the t time to alarm unit 10, while exporting control instruction and giving control output
Unit 11, wherein delay time t is 0~30s；Alarm unit 10 issues sound-light alarm instruction, control according to the alarm command
Output unit 11 generates disjunction according to the control instruction and is protected by the control signal in protection single phase ac circuit, and according to disjunction
The control signal in shield single phase ac circuit makes to be protected the disjunction of single phase ac circuit.
Wherein, by the insulation resistance resistance value R in protection single phase ac circuit1Are as follows:
Wherein, work as R1≥R0When, identification is good by the insulation performance in protection single phase ac circuit, works as R1<R0When, then assert
It is destroyed by the insulation performance in protection single phase ac circuit, by protection single phase ac circuit, there are ground short circuit failures and potential electricity
Gas fire hazard；
Online separation and Extraction is by the virtual value I of lump residual current signal in protection single phase ac circuit in step 2)ZIt is interior
Resistive residual current component virtual value IRConcrete operations are as follows: in lump residual current the phase of resistive residual current component with
Circuit phase voltage phase is consistent, resistive residual current component virtual value IRSize be equal to lump residual current in phase voltage
Component on direction, resistive residual current component virtual value IRSize be IZ*cos
In addition, then being controlled by reset circuit module 5 after ground short circuit failure and potential electrical fire danger are excluded
One-chip computer module 6 is resetted.
The basic principles, principal features and advantages of the present invention are described by described above and embodiment, are especially shown
Where marrow of the invention --- it is by acquiring, handling in real time, calculate phase voltage virtual value U, lump residual current effective
Value IZAnd the phase angle difference between phase voltage signal sum aggregate total surplus current signalThe resistive residual current component of separation and Extraction is effective
Value IR, calculate by protection single phase ac circuit insulation resistance resistance value R1, and the preset alarm threshold value R with setting0It is compared,
Work as R1<R0When, then assert and destroyed by protection single phase ac circuit insulation performance, there are ground short circuit failures and potential electrical fire
Danger, to realize to single phase ac circuit because route and the destruction of load isolation performance cause ground short circuit failure and electrical fire
Effective, the precisely online prevention and control of accident.
Practical application mode of the invention is simultaneously not restricted to the described embodiments, before not departing from spirit of the scope of the present invention
It puts, the present invention also has various corresponding changes and improves (such as extending in three-phase alternating current circuit), these changes and improvements
Should all fall into the scope of protection of present invention, and protection scope can by the present patent application text appended claims and
Its equivalent thereof.
Claims (9)
1. a kind of single-phase online prevention and control device of insulated electric fire, which is characterized in that including controlling output unit (11), monolithic
Machine module (6), DSP unit (8), for real-time detection and improve by the lump residual current signal in protection single phase ac circuit
Residual current signal detection and conditioning unit and for real-time detection and improve by the phase electricity in protection single phase ac circuit
Press voltage signal detection and the conditioning unit of signal, wherein the output end and voltage of residual current signal detection and conditioning unit
Signal detection is connected with the input terminal of DSP unit (8) with the output end of conditioning unit, the output end and list of DSP unit (8)
The input terminal of piece machine module (6) is connected, and the output end of one-chip computer module (6) is connected with control output unit (11).
2. the single-phase online prevention and control device of insulated electric fire according to claim 1, which is characterized in that the remaining electricity
Stream signal detection and conditioning unit include for real-time detection by protection single phase ac circuit lump residual current signal it is surplus
Aftercurrent signal detection module (1) and for being improved by lump residual current signal in protection single phase ac circuit
Residual current signal conditioning circuit module (2).
3. the single-phase online prevention and control device of insulated electric fire according to claim 2, which is characterized in that the remaining electricity
Flowing signal detection module (1) is residual current transformer, and the residual current signal conditioning circuit module (2) is connect by being sequentially connected
I/V conversion, RC filter circuit, amplifying circuit and amplitude limiter circuit composition.
4. the single-phase online prevention and control device of insulated electric fire according to claim 1, which is characterized in that voltage signal inspection
Surveying with conditioning unit includes detecting mould by the voltage signal of the phase voltage signal in protection single phase ac circuit for real-time detection
Block (3) and for the voltage signal conditioning circuit module improved by the phase voltage signal in protection single phase ac circuit
(4)。
5. the single-phase online prevention and control device of insulated electric fire according to claim 4, which is characterized in that the voltage letter
Number detection module (3) is voltage transformer, and the voltage signal conditioning circuit module (4) is by being sequentially connected the I/V connect conversion, RC
Filter circuit, amplifying circuit and amplitude limiter circuit composition.
6. the single-phase online prevention and control device of insulated electric fire according to claim 1, which is characterized in that further include and list
Ethernet communication unit (9), reset circuit module (5) and the alarm unit (10) that piece machine module (6) is connected, one-chip computer module
(6) it is connected by ethernet communication unit (9) with host computer.
7. the single-phase online prevention and control device of insulated electric fire according to claim 6, which is characterized in that one-chip computer module
(6) it is connected by photoelectric coupler module (7) with alarm unit (10) and control output unit (11).
8. a kind of single-phase online preventing control method of insulated electric fire, which is characterized in that based on described in claim 1 single-phase exhausted
The online prevention and control device of edge formula electrical fire, comprising the following steps:
1) residual current signal detection and conditioning unit real-time detection and conditioning are by the collection total surplus in protection single phase ac circuit
Current signal；Voltage signal detection is with conditioning unit real-time detection and conditioning is believed by the phase voltage in protection single phase ac circuit
Number；DSP unit (8) is calculated by the virtual value I of lump residual current signal in protection single phase ac circuitZAnd by protection blow-up
The virtual value U of phase voltage signal in road is flowed back to, then calculates phase angle difference between the two
2) one-chip computer module (6) is according to by the virtual value I of lump residual current signal in protection single phase ac circuitZ, it is single by protection
The virtual value U of phase voltage signal and phase angle difference between the two in phase ac circuitOnline separation and Extraction is protected single-phase
The virtual value I of lump residual current signal in ac circuitZInterior resistive residual current component virtual value IR, then calculate and protected
The insulation resistance resistance value R in single phase ac circuit1, when by the insulation resistance resistance value R in protection single phase ac circuit1Less than preset alarm
Threshold value R0When, then alarm command is exported after postponing the t time and gives alarm unit (10), while it is single to control output to export control instruction
First (11), alarm unit (10) issue sound-light alarm according to the alarm command and indicate, control output unit (11) according to
Control instruction generates disjunction by the control signal in protection single phase ac circuit, and according to disjunction by the control in protection single phase ac circuit
Signal processed makes to be protected the disjunction of single phase ac circuit.
9. the single-phase online preventing control method of insulated electric fire according to claim 8, which is characterized in that single-phase by protecting
The insulation resistance resistance value R of ac circuit1Are as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810892435.XA CN109038517B (en) | 2018-08-07 | 2018-08-07 | Single-phase insulation type electric fire on-line prevention and control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810892435.XA CN109038517B (en) | 2018-08-07 | 2018-08-07 | Single-phase insulation type electric fire on-line prevention and control device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109038517A true CN109038517A (en) | 2018-12-18 |
| CN109038517B CN109038517B (en) | 2020-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810892435.XA Active CN109038517B (en) | 2018-08-07 | 2018-08-07 | Single-phase insulation type electric fire on-line prevention and control device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781536A (en) * | 2020-08-04 | 2020-10-16 | 蚌埠依爱消防电子有限责任公司 | Method for monitoring ground insulation resistance and leakage capacitance of single-phase alternating current system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530578A (en) * | 1991-07-22 | 1993-02-05 | Matsushita Electric Works Ltd | Line monitor terminal equipment for remote monitor and control system |
| CN102354427A (en) * | 2011-09-27 | 2012-02-15 | 赵怀军 | method and device for flexibly identifying residual current-type electrical fire on line |
| CN107528290A (en) * | 2017-09-29 | 2017-12-29 | 西安华瑞网电设备有限公司 | A kind of inverse time lag current-limiting type electrical fire prevention and control device and method |
| CN206920548U (en) * | 2017-07-03 | 2018-01-23 | 北京航天常兴科技发展股份有限公司 | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula |
-
2018
- 2018-08-07 CN CN201810892435.XA patent/CN109038517B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530578A (en) * | 1991-07-22 | 1993-02-05 | Matsushita Electric Works Ltd | Line monitor terminal equipment for remote monitor and control system |
| CN102354427A (en) * | 2011-09-27 | 2012-02-15 | 赵怀军 | method and device for flexibly identifying residual current-type electrical fire on line |
| CN206920548U (en) * | 2017-07-03 | 2018-01-23 | 北京航天常兴科技发展股份有限公司 | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula |
| CN107528290A (en) * | 2017-09-29 | 2017-12-29 | 西安华瑞网电设备有限公司 | A kind of inverse time lag current-limiting type electrical fire prevention and control device and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781536A (en) * | 2020-08-04 | 2020-10-16 | 蚌埠依爱消防电子有限责任公司 | Method for monitoring ground insulation resistance and leakage capacitance of single-phase alternating current system |
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| CN109038517B (en) | 2020-02-11 |
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Denomination of invention: A single phase insulation type electric fire online prevention and control device and method Effective date of registration: 20201221 Granted publication date: 20200211 Pledgee: Pudong Development Bank of Shanghai Limited by Share Ltd. Xi'an branch Pledgor: XIAN HI-RATE POWER TECHNOLOGY Co.,Ltd. Registration number: Y2020610000240 |