CN105738752A - Grounding detection apparatus and detection method for electrolytic DC system - Google Patents
Grounding detection apparatus and detection method for electrolytic DC system Download PDFInfo
- Publication number
- CN105738752A CN105738752A CN201610248861.0A CN201610248861A CN105738752A CN 105738752 A CN105738752 A CN 105738752A CN 201610248861 A CN201610248861 A CN 201610248861A CN 105738752 A CN105738752 A CN 105738752A
- Authority
- CN
- China
- Prior art keywords
- bus
- voltage
- ground
- earth
- controller
- 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.)
- Granted
Links
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a grounding detection apparatus and detection method for an electrolytic DC system. The grounding detection apparatus comprises a controller, a first transmitter, a second transmitter, a first power resistor, a second power resistor, a first switch and a second switch, wherein one end of a DC bus positive electrode is connected with a first detection port of the controller through the first transmitter, the other end of the DC bus positive electrode is grounded with the first switch through the first power resistor, one end of a DC bus negative electrode is connected with a second detection port of the controller through the second transmitter, the other end of the DC bus negative electrode is grounded with the second switch through the second power resistor, and the controller determines whether the DC bus is grounded according to the voltage difference when the DC bus positive electrode and the DC bus negative electrode communicate with each other. Whether the DC bus is grounded can be detected, so as to protect workers against electric shock, and prevent energy waste and equipment damage. The grounding detection apparatus is simple in structure, easy for installation, convenient for operation and is safe and reliable.
Description
Technical field
The present invention relates to electrolysis direct current detection technique field, be specifically related to a kind of electrolysis direct current system ground detection device and detection method.
Background technology
Electrolysis direct current system bus is generally in naked state, often can be at ground state in production process.DC system grounding includes straight-flow system one point earth and two kinds of situations of straight-flow system two points ground fault.In straight-flow system, direct current positive and negative electrode is insulation over the ground, any harm is not caused owing to not constituting the path of earth current when there is a pole ground connection, but a pole ground connection long-term work is unallowed, because when there is ground connection again in another place of same pole, loop will be formed, the loop of usual electrolysis direct current system two points ground fault is formed by column, electric current flowing is just had inside loop after forming loop, time one is long to be had the reinforcing bar that electric current flows through to generate heat to blow, also result in column and burst apart.Two points ground fault not only causes that column damages, and causes wasting of electric energy.The most important is the increase in personnel and gets an electric shock the probability of injures and deaths; because staff's work process of electrolysis can touch direct current inlet wire often; if when straight-flow system does not have ground connection by the electric current of human body being the capacitance current of moment; the electric current flowing through health got an electric shock is much smaller; if but straight-flow system is when there being ground connection; so will forming loop with earth point, electric shock is persistence, and the electric current simultaneously flowing through health also wants big many.
Electrolysis direct current system current－carrying conductor cross section is big, it is impossible to using the mode that electric current surveyed by conventional current transformer to measure insulation resistance, electrolysis production line is long simultaneously, and each insulating point arranges test point over the ground, and quantities is very big, it is difficult to implement.
Summary of the invention
It is contemplated that at least solve one of above-mentioned technical problem.
For this, first purpose of the present invention is in that to propose a kind of electrolysis direct current system ground detection device.
Second purpose of the present invention is in that to propose a kind of electrolysis direct current system ground detecting method.
To achieve these goals, embodiment of the invention discloses that a kind of electrolysis direct current system ground detection device, including controller, the first transmitter, the second transmitter, the first power resistor, the second power resistor, the first switch and second switch, one end of dc bus positive pole is connected by the first detection port of described first transmitter and described controller, and the other end of described dc bus positive pole is by described first power resistor and described first switch ground connection；One end of dc bus negative pole is connected by the second detection port of described second transmitter and described controller, and the other end of described dc bus negative pole passes through described second power resistor and described second switch ground connection；Wherein, the first voltage and tertiary voltage judges described dc bus positive pole whether ground connection over the ground when disconnecting over the ground when described controller is for gathering the connection of described dc bus positive pole respectively；Second voltage and the 4th voltage judges described dc bus negative pole whether ground connection over the ground when disconnecting over the ground when described controller is additionally operable to gather respectively the connection of described dc bus negative pole.
Electrolysis direct current system ground detection device according to embodiments of the present invention, it is possible to detection dc bus whether ground connection, thus avoiding staff to get an electric shock, wasting the energy and damage equipment, and simple in construction, be easily installed, convenient operation, safe and reliable.
It addition, electrolysis direct current system ground detection device according to the above embodiment of the present invention, it is also possible to there is following additional technical characteristic:
Further, also including the first fuse and the second fuse, one end of described dc bus positive pole passes sequentially through described first fuse, described first switch and described first power resistor ground connection；One end of described dc bus negative pole passes sequentially through described second fuse, described second switch and described second power resistor ground connection.
Further, described controller is additionally operable to when judging described dc bus plus earth, judge the earth resistance of described dc bus positive pole according to described first voltage and described tertiary voltage, and judge the earthing position of described dc bus positive pole according to the earth resistance of described dc bus；Described controller is additionally operable to when judging described dc bus minus earth, judge the earth resistance of described dc bus negative pole according to described second voltage and described 4th voltage, and judge the earthing position of described dc bus negative pole according to the earth resistance of described dc bus negative pole.
Further, also including touch screen, described touch screen and described controller and connect, described controller is for inputting instruction to described controller and receiving the display information of described controller.
To achieve these goals, embodiment of the invention discloses that a kind of electrolysis direct current system ground detecting method, including the electrolysis direct current system ground detection device of preceding claim, said method comprising the steps of: S1: gather before described dc bus plus earth the second voltage over the ground before the first voltage over the ground and described dc bus minus earth；S2: the 4th voltage over the ground when tertiary voltage over the ground and described dc bus minus earth when gathering described dc bus plus earth；S3: according to the difference of described first voltage and described tertiary voltage whether more than first threshold, is then described dc bus plus earth；Whether the difference according to described second voltage and described 4th voltage, more than Second Threshold, is then described dc bus minus earth.
Electrolysis direct current system ground detecting method according to embodiments of the present invention, it is possible to detection dc bus whether ground connection, thus avoiding staff to get an electric shock, wasting the energy and damage equipment, and simple in construction, be easily installed, convenient operation, safe and reliable.
It addition, electrolysis direct current system ground detecting method according to the above embodiment of the present invention, it is also possible to there is following additional technical characteristic:
Further, further comprising the steps of: S4: when described dc bus plus earth, the position of dc bus plus earth described in the mathematic interpolation of described first voltage and described tertiary voltage；When described dc bus minus earth, the position of dc bus minus earth described in the mathematic interpolation of described second voltage and described 4th voltage.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from conjunction with will be apparent from easy to understand the accompanying drawings below description to embodiment, wherein:
Fig. 1 is the structural representation of the electrolysis direct current system ground detection device of one embodiment of the invention；
Fig. 2 is the flow chart of the electrolysis direct current system ground detecting method of one embodiment of the invention.
Detailed description of the invention
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, and is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or hint relative importance.
In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or connect integratedly；Can be mechanically connected, it is also possible to be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals.For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
With reference to as explained below and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention.Describe at these and in accompanying drawing, specifically disclose some particular implementation in embodiments of the invention, representing some modes of the principle implementing embodiments of the invention, but it is to be understood that the scope of embodiments of the invention is not limited.On the contrary, all changes within the scope of embodiments of the invention include falling into attached claims spirit and intension, amendment and equivalent.
Below in conjunction with accompanying drawing, electrolysis direct current system ground detection device according to embodiments of the present invention is described.
Fig. 1 is the structural representation of the electrolysis direct current system ground detection device of one embodiment of the invention.Refer to Fig. 1, a kind of electrolysis direct current system ground detection device, including controller PLC, the first transmitter A1, the second transmitter A2, the first power resistor R1, the second power resistor R2 and the first switch 1ZZK, second switch 1ZZK.
One end of dc bus positive pole is connected by the first binding post XT1 and the second binding post XT2 and the first transmitter A1.The first detection port AI0 of the first transmitter A1 and controller PLC connects.The other end of dc bus positive pole is by the first power resistor R1 and the first switch 1ZZK ground connection.In an example of the present invention, the first power resistor R1 is the ripple resistance of 100 Ω, the pick-up voltage 1500V of the first transmitter A1.
One end of dc bus negative pole is connected by the first binding post XT1 and the first transmitter A1 and the second transmitter A2.The second detection port AI1 of the second transmitter A2 and controller PLC connects.The other end of dc bus positive pole passes through the second power resistor R2 and second switch 1ZZK ground connection.In an example of the present invention, the first power resistor R1 is the ripple resistance of 100 Ω, the pick-up voltage 0～10V of the second transmitter A2.
Controller PLC for gather respectively dc bus positive pole through before 100 Ω resistance eutral groundings over the ground after the first voltage and ground connection over the ground tertiary voltage judge dc bus positive pole whether ground connection.Controller PLC be additionally operable to gather respectively dc bus negative pole through before 100 Ω resistance eutral groundings over the ground after the second voltage and ground connection over the ground the 4th voltage judge dc bus negative pole whether ground connection.In an example of the present invention, PLC uses AB small controller.
Electrolysis direct current system ground detection device according to embodiments of the present invention, uses bus differential pressure method over the ground to detect its whether ground connection.
In an example of the present invention, electrolysis direct current bus has an earth point, and collecting the first voltage is 432V, and tertiary voltage is 332V, and the second voltage is 727V, and the 4th voltage is 14V.From gathering voltage it is known that this straight-flow system voltage is the first voltage is 1159V plus the second voltage, its positive and negative voltage-to-ground should be about 579V when the drift of no ground and inferred-zero, plus null offset voltage about 100V, voltage-to-ground in its inferred-zero drift situation deducts drift voltage difference voltage at about 400V, and the actual positive and negative voltage-to-ground measured can move left and right at 400V to 700V.It is 100V that first voltage deducts tertiary voltage difference, less than difference voltage 400V, therefore judges its plus earth；It is 713 that second voltage deducts the 4th voltage difference, more than difference voltage 400V, therefore judges that its negative pole is no ground.
In one embodiment of the invention, electrolysis direct current system ground detection device also includes the first fuse FU1 and the second fuse FU2.One end of dc bus positive pole passes sequentially through the first fuse FU1, the first switch 1ZZK and the first power resistor R1 ground connection.One end of dc bus negative pole passes sequentially through the second fuse FU2, second switch 1ZZK and the second power resistor R2 ground connection.When being possible to prevent dc bus to detect by the first fuse FU1 and the second fuse FU2 because of short circuit and damage equipment.
In one embodiment of the invention, controller PLC is additionally operable to when judging dc bus plus earth, judge the earth resistance of dc bus positive pole according to the first voltage and tertiary voltage, and judge the earthing position of dc bus positive pole according to the earth resistance of dc bus.Controller PLC is additionally operable to when judging dc bus minus earth, judges the earth resistance of dc bus negative pole according to the second voltage and the 4th voltage, and judges the earthing position of dc bus negative pole according to the earth resistance of dc bus negative pole.
In an example of the present invention, according to the data that example 1 gathers, it is 3.32A that tertiary voltage 332 obtains its earth current divided by 100 Ω, the first voltage deduct tertiary voltage difference 100V divided by 3.32 earth resistance be 30 Ω；It is 4.05V that system total voltage 1159 obtains separate unit tank voltage divided by electrolysis bath number 286；It is the 106th groove of positive direction that first voltage 432 obtains earthing position divided by separate unit tank voltage 4.05.
Below in conjunction with accompanying drawing, electrolysis direct current system ground detecting method according to embodiments of the present invention is described.
Fig. 2 is the flow chart of the electrolysis direct current system ground detecting method of one embodiment of the invention.Refer to Fig. 2, a kind of electrolysis direct current system ground detecting method, including the electrolysis direct current system ground detection device of above-described embodiment, said method comprising the steps of:
S1: gather before dc bus plus earth the second voltage over the ground before the first voltage over the ground and described dc bus minus earth.
S2: the 4th voltage over the ground when gathering tertiary voltage over the ground and described dc bus minus earth during dc bus plus earth.
S3: according to the difference of the first voltage and tertiary voltage whether more than first threshold, is then dc bus plus earth.Whether the difference according to the second voltage and the 4th voltage, more than Second Threshold, is then dc bus minus earth.
In one embodiment of the invention, also include S4: when dc bus plus earth, the position according to the mathematic interpolation dc bus plus earth of the first voltage and tertiary voltage.Position when dc bus minus earth, according to the mathematic interpolation dc bus minus earth of the second voltage and the 4th voltage.
It addition, other of the electrolysis direct current system ground detection device of the embodiment of the present invention and detection method is constituted and effect is all known for a person skilled in the art, in order to reduce redundancy, do not repeat.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: these embodiments can being carried out multiple change, amendment, replacement and modification when without departing from principles of the invention and objective, the scope of the present invention is by claim and equivalency thereof.
Claims (6)
1. an electrolysis direct current system ground detection device, it is characterised in that include controller, the first transmitter, the second transmitter, the first power resistor, the second power resistor, the first switch and second switch,
One end of dc bus positive pole is connected by the first detection port of described first transmitter and described controller, and the other end of described dc bus positive pole is by described first power resistor and described first switch ground connection；
One end of dc bus negative pole is connected by the second detection port of described second transmitter and described controller, and the other end of described dc bus negative pole passes through described second power resistor and described second switch ground connection；
Wherein, the first voltage and tertiary voltage judges described dc bus positive pole whether ground connection over the ground when disconnecting over the ground when described controller is for gathering the connection of described dc bus positive pole respectively；Second voltage and the 4th voltage judges described dc bus negative pole whether ground connection over the ground when disconnecting over the ground when described controller is additionally operable to gather respectively the connection of described dc bus negative pole.
2. electrolysis direct current system ground detection device according to claim 1, it is characterised in that also include the first fuse and the second fuse,
One end of described dc bus positive pole passes sequentially through described first fuse, described first switch and described first power resistor ground connection；
One end of described dc bus negative pole passes sequentially through described second fuse, described second switch and described second power resistor ground connection.
3. electrolysis direct current system ground detection device according to claim 1, it is characterized in that, described controller is additionally operable to when judging described dc bus plus earth, judge the earth resistance of described dc bus positive pole according to described first voltage and described tertiary voltage, and judge the earthing position of described dc bus positive pole according to the earth resistance of described dc bus；Described controller is additionally operable to when judging described dc bus minus earth, judge the earth resistance of described dc bus negative pole according to described second voltage and described 4th voltage, and judge the earthing position of described dc bus negative pole according to the earth resistance of described dc bus negative pole.
4. according to the arbitrary described electrolysis direct current system ground detection device of claim 1-3, it is characterized in that, also including touch screen, described touch screen and described controller to connect, described controller is for inputting instruction to described controller and receiving the display information of described controller.
5. an electrolysis direct current system ground detecting method, it is characterised in that include the arbitrary described electrolysis direct current system ground detection device of claim 1-4, said method comprising the steps of:
S1: gather before described dc bus plus earth the second voltage over the ground before the first voltage over the ground and described dc bus minus earth；
S2: the 4th voltage over the ground when tertiary voltage over the ground and described dc bus minus earth when gathering described dc bus plus earth；
S3: according to the difference of described first voltage and described tertiary voltage whether more than first threshold, is then described dc bus plus earth；Whether the difference according to described second voltage and described 4th voltage, more than Second Threshold, is then described dc bus minus earth.
6. electrolysis direct current system ground detecting method according to claim 5, it is characterised in that further comprising the steps of:
S4: when described dc bus plus earth, the position of dc bus plus earth according to the mathematic interpolation of described first voltage and described tertiary voltage；When described dc bus minus earth, the position of dc bus minus earth described in the mathematic interpolation of described second voltage and described 4th voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610248861.0A CN105738752B (en) | 2016-04-20 | 2016-04-20 | Electrolysis direct current system ground detection device and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610248861.0A CN105738752B (en) | 2016-04-20 | 2016-04-20 | Electrolysis direct current system ground detection device and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105738752A true CN105738752A (en) | 2016-07-06 |
| CN105738752B CN105738752B (en) | 2019-04-30 |
Family
ID=56255046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610248861.0A Active CN105738752B (en) | 2016-04-20 | 2016-04-20 | Electrolysis direct current system ground detection device and detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105738752B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2172518A6 (en) * | 1972-02-16 | 1973-09-28 | Comp Generale Electricite | Digital control system - esp for electrolytic tanks |
| CN1948975A (en) * | 2006-11-14 | 2007-04-18 | 沈阳铝镁设计研究院 | Apparatus and method for testing absolute resistance to ground of electrolytic tank series |
| CN101907680A (en) * | 2009-06-04 | 2010-12-08 | 沈阳铝镁设计研究院 | Electrolysis direct current system online insulated monitoring device and a monitoring method |
| CN102998536A (en) * | 2012-10-30 | 2013-03-27 | 广东易事特电源股份有限公司 | Highly-reliable detection method for insulation resistance of direct-current buses |
| CN202870174U (en) * | 2012-10-30 | 2013-04-10 | 广东易事特电源股份有限公司 | Low energy consumption circuit for detecting insulating resistance of DC bus |
| CN103320815A (en) * | 2012-03-22 | 2013-09-25 | 贵阳铝镁设计研究院有限公司 | Electrolysis tank insulation detection apparatus |
-
2016
- 2016-04-20 CN CN201610248861.0A patent/CN105738752B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2172518A6 (en) * | 1972-02-16 | 1973-09-28 | Comp Generale Electricite | Digital control system - esp for electrolytic tanks |
| CN1948975A (en) * | 2006-11-14 | 2007-04-18 | 沈阳铝镁设计研究院 | Apparatus and method for testing absolute resistance to ground of electrolytic tank series |
| CN101907680A (en) * | 2009-06-04 | 2010-12-08 | 沈阳铝镁设计研究院 | Electrolysis direct current system online insulated monitoring device and a monitoring method |
| CN103320815A (en) * | 2012-03-22 | 2013-09-25 | 贵阳铝镁设计研究院有限公司 | Electrolysis tank insulation detection apparatus |
| CN102998536A (en) * | 2012-10-30 | 2013-03-27 | 广东易事特电源股份有限公司 | Highly-reliable detection method for insulation resistance of direct-current buses |
| CN202870174U (en) * | 2012-10-30 | 2013-04-10 | 广东易事特电源股份有限公司 | Low energy consumption circuit for detecting insulating resistance of DC bus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105738752B (en) | 2019-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1948975B (en) | Apparatus and method for testing absolute resistance to ground of electrolytic tank series | |
| CN104228588B (en) | High-voltage loop diagnostic circuit of pure electric vehicle | |
| CN103958261B (en) | For the method monitoring the capacitive filter of battery charger | |
| CN102401872B (en) | Earth fault line aligning and phasing method of IT electric system with neutral conductor | |
| CN102841284B (en) | On-line insulated monitoring method for high voltage of electromobile | |
| CN106093739A (en) | A kind of charging pile insulation monitoring and warning device of special bridge method design | |
| CN106427614A (en) | System and method for total voltage sampling and relay diagnosis for battery system of electric vehicle | |
| CN107064638A (en) | A kind of insulation resistance detection device and method based on injection periodic time self-adapting strategy | |
| CN104641244B (en) | For detecting and measuring the device of insulation fault | |
| CN103558506B (en) | Non-implanted formula DC system earth fault lookup method and device thereof | |
| CN103983857A (en) | Direct current insulation monitoring circuit and method | |
| CN106501639B (en) | Three-phase and four-line IT system electric energy quality monitoring and insulation fault line selection and location method | |
| CN206573677U (en) | Signal generator and the straight-flow system insulation fault location instrument based on it | |
| CN206020596U (en) | A kind of charging pile insulation monitoring and warning device of bridge method design | |
| CN106680660B (en) | A kind of AC electric locomotive traction auxiliary system earth-fault detecting method | |
| CN206235668U (en) | A kind of electric automobile high-voltage insulation fault identifying device | |
| CN106680646A (en) | Failure inspection system enabling discrimination between leakage current failure and short-circuit failure | |
| CN107422185A (en) | A kind of insulation resistance of DC system observation circuit, system and method | |
| CN106771637A (en) | Electric line inspection earthing wire state on-line monitoring method and device | |
| CN106353695A (en) | Device and method for detecting insulation against ground fault of direct-current power source | |
| CN109975646A (en) | A kind of motor winding open circuit On-line self-diagnosis method of wye connection | |
| CN103018621A (en) | Direct current insulation monitoring module based on 24V power system and achieving method thereof | |
| CN104166083B (en) | Fault detection method and device for IGBT (insulated gate bipolar transistor) reverse parallel diode | |
| CN103884930A (en) | Full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring | |
| CN104836462B (en) | The frequency and detection method, the device of phase of the input AC electricity of air-conditioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |