CN2837858Y - Detection circuit for electric DC system positive and negative bus simultaneous earthing - Google Patents
Detection circuit for electric DC system positive and negative bus simultaneous earthing Download PDFInfo
- Publication number
- CN2837858Y CN2837858Y CN 200520065509 CN200520065509U CN2837858Y CN 2837858 Y CN2837858 Y CN 2837858Y CN 200520065509 CN200520065509 CN 200520065509 CN 200520065509 U CN200520065509 U CN 200520065509U CN 2837858 Y CN2837858 Y CN 2837858Y
- Authority
- CN
- China
- Prior art keywords
- positive
- electric
- unbalanced
- earthing
- resistors
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to the field of electric detection, particularly a detection circuit for the simultaneous earthing of positive and negative buses of an electric DC system, which comprises positive buses, negative buses, a plurality of balance resistors, unbalanced resistors and loads, wherein the balance resistors are connected with the loads by the positive buses and connected with the unbalanced resistors by the negative buses, wherein the detection circuit for the simultaneous earthing of positive and negative buses of an electric DC system also comprises an optical coupling relay which can be used for connecting the balance resistors and the unbalanced resistors. The detection circuit for the simultaneous earthing of positive and negative buses of an electric DC system of the utility model adopts the optical coupling relay AQW 214. Because the relay has no mechanical contact, the service life is long and the action period invested to the unbalanced resistors can be reduced. The failure of the simultaneous descent of the positive and negative bus insulation of a DC system can be quickly detected.
Description
[technical field]
The utility model relates to the electric power detection range, relates in particular to a kind of electric power DC system positive and negative busbar testing circuit of ground connection simultaneously.
[background technology]
Traditional straight-flow system insulation detecting method is the bridge balance method, and its limitation is to detect the situation that positive and negative busbar insulating descends simultaneously.Exchange and method that frequency conversion detects because of to the interference of bus with can not deal with big distributed capacitance and use and be restricted.Development in recent years a kind of artificial intervention detect the direct current unbalanced electric bridge of resistance, promptly regularly insert one-sided detection unbalanced resistance.Conventional electromagnetic relay is generally adopted in the access of unbalanced resistance at present, and deficiency such as electromagnetic relay exists that Control current is big, noise big, machinery and electrical endurance are limited, directly has influence on the reliability of system, has reduced system's time between failures.Owing to be subjected to the restriction in relay life-span, the gap periods that drops into unbalanced resistance is long in addition, and when the situation that positive and negative busbar insulating descends simultaneously appears in system, detection can not detect fault timely.
[utility model content]
The purpose of this utility model is to provide the testing circuit of positive and negative busbar insulating fault in a kind of faster detection straight-flow system.
For achieving the above object, the utility model adopts following technical scheme:
A kind of electric power DC system positive and negative busbar grounded inspection circuit simultaneously comprises positive bus-bar, negative busbar, some balance resistances, unbalanced resistance, load, described balance resistance is connected with load by positive bus-bar and is connected with unbalanced resistance by negative busbar, and wherein foregoing circuit also comprises a light coupling relay that connects balance resistance and unbalanced resistance.
Compared with prior art, the utility model electric power DC system positive and negative busbar grounded inspection circuit simultaneously adopts light coupling relay AQW214, because this relay does not have mechanical contact, life-span is long, the action cycle of dropping into unbalanced resistance can be reduced, the fault that the straight-flow system positive and negative busbar insulating descends simultaneously can be detected faster.
[description of drawings]
Fig. 1 is the utility model electric power DC system positive and negative busbar grounded inspection circuit figure simultaneously.
[embodiment]
See also shown in Figure 1ly, a kind of electric power DC system positive and negative busbar is grounded inspection circuit simultaneously, comprises positive bus-bar+KM, negative busbar-KM, two balance resistance R
0, unbalanced resistance R
t, load R
LWith light coupling relay K.Balance resistance R
0Be to be connected in series.Balance resistance R
0By positive bus-bar+KM and load R
LBe connected in series; Balance resistance R
0By negative busbar-KM and unbalanced resistance R
tBe connected in series.Light coupling relay K one end ground connection and and balance resistance R
0Connect the other end and unbalanced resistance R
tConnect.R
L+Be expressed as the equivalent ground connection pull-up resistor of positive bus-bar+KM, R
1Be expressed as the equivalent ground connection equivalent resistance of negative busbar-KM.
Light coupling relay K adopts the AQW214 of PANASONIC.The concrete parameter of AQW214 is as shown in the table:
| Input | I Fon 0.9mA |
| I Foff 0.4mA | |
| V F 1.14V | |
| Output | R on 30Ω |
| I Leak 1μA | |
| Transport property | T on 0.31ms |
| T off 0.05ms | |
| C iso 0.8pF | |
| R iso 1000MΩ |
Table one
The utility model has been introduced a kind of electric power DC system positive and negative busbar grounded inspection circuit simultaneously by being example with light coupling relay AQW214, and this can not be considered to the restriction to the utility model claim.If those skilled in the art has made change unsubstantiality, conspicuous or improvement according to the utility model, all should belong to the scope of the utility model claim protection.
Claims (2)
1, a kind of electric power DC system positive and negative busbar while grounded inspection circuit, described circuit comprises positive bus-bar, negative busbar, some balance resistances, unbalanced resistance and load, described balance resistance is connected with load by positive bus-bar and is connected with unbalanced resistance by negative busbar, it is characterized in that: described circuit also comprises a light coupling relay that connects balance resistance and unbalanced resistance.
2, electric power DC system positive and negative busbar while grounded inspection circuit according to claim 1, it is characterized in that: described light coupling relay adopts AQW214.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520065509 CN2837858Y (en) | 2005-10-11 | 2005-10-11 | Detection circuit for electric DC system positive and negative bus simultaneous earthing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520065509 CN2837858Y (en) | 2005-10-11 | 2005-10-11 | Detection circuit for electric DC system positive and negative bus simultaneous earthing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2837858Y true CN2837858Y (en) | 2006-11-15 |
Family
ID=37392346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520065509 Expired - Fee Related CN2837858Y (en) | 2005-10-11 | 2005-10-11 | Detection circuit for electric DC system positive and negative bus simultaneous earthing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2837858Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279340A (en) * | 2011-07-20 | 2011-12-14 | 珠海泰坦新能源系统有限公司 | Direct-grounding insulation fault detection device and method |
| CN102486496A (en) * | 2010-12-03 | 2012-06-06 | 北京人民电器厂有限公司 | Direct current insulation monitoring system and method capable of overcoming relay protection maloperation |
| CN102680863A (en) * | 2011-03-16 | 2012-09-19 | 北京人民电器厂有限公司 | Method for monitoring same-time same-proportion decline of insulativities to earth on two poles of DC system |
| CN102830283A (en) * | 2011-06-13 | 2012-12-19 | 中兴通讯股份有限公司 | Insulating detection device and detection method for direct-current power supply |
| CN103033689A (en) * | 2011-09-30 | 2013-04-10 | 首瑞（北京）投资管理集团有限公司 | Direct current insulation monitoring device and method capable of compensating deviation of voltage to earth of positive pole and negative pole |
| CN103048579A (en) * | 2012-11-08 | 2013-04-17 | 珠海泰坦科技股份有限公司 | Monitoring device for insulation between direct-current buses and between buses and ground |
-
2005
- 2005-10-11 CN CN 200520065509 patent/CN2837858Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486496A (en) * | 2010-12-03 | 2012-06-06 | 北京人民电器厂有限公司 | Direct current insulation monitoring system and method capable of overcoming relay protection maloperation |
| CN102680863A (en) * | 2011-03-16 | 2012-09-19 | 北京人民电器厂有限公司 | Method for monitoring same-time same-proportion decline of insulativities to earth on two poles of DC system |
| CN102680863B (en) * | 2011-03-16 | 2015-02-04 | 北京人民电器厂有限公司 | Method for monitoring same-time same-proportion decline of insulativities to earth on two poles of DC system |
| CN102830283A (en) * | 2011-06-13 | 2012-12-19 | 中兴通讯股份有限公司 | Insulating detection device and detection method for direct-current power supply |
| CN102279340A (en) * | 2011-07-20 | 2011-12-14 | 珠海泰坦新能源系统有限公司 | Direct-grounding insulation fault detection device and method |
| CN103033689A (en) * | 2011-09-30 | 2013-04-10 | 首瑞（北京）投资管理集团有限公司 | Direct current insulation monitoring device and method capable of compensating deviation of voltage to earth of positive pole and negative pole |
| CN103048579A (en) * | 2012-11-08 | 2013-04-17 | 珠海泰坦科技股份有限公司 | Monitoring device for insulation between direct-current buses and between buses and ground |
| CN103048579B (en) * | 2012-11-08 | 2015-05-06 | 珠海泰坦科技股份有限公司 | Monitoring device for insulation between direct-current buses and between buses and ground |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2837858Y (en) | Detection circuit for electric DC system positive and negative bus simultaneous earthing | |
| CN202994907U (en) | Insulation impedance detection system of photovoltaic inverter | |
| CN109664841A (en) | A kind of high voltage interlock circuit, fault detection method and device | |
| CN101614795B (en) | Default-phase signal detection circuit for three-phase power | |
| CN202770942U (en) | Electric-fire monitoring detector, and failure detecting circuit for residual current sensor of same | |
| CN111181561A (en) | Signal self-adaptive acquisition terminal and acquisition method | |
| CN103941135A (en) | Short circuit detection method and device | |
| CN105099506A (en) | Electric energy meter RS485 communication failure detecting and self-healing device and method | |
| CN206400033U (en) | New-energy automobile high voltage power distributing cabinet universal test frock | |
| CN216350976U (en) | Fault detection circuit, direct current power supply system and direct current equipment | |
| CN110605964B (en) | High-voltage interlocking detection method and system | |
| CN202159120U (en) | Power storage battery high voltage relay fault diagnosing circuit | |
| CN215813268U (en) | Circuit of electric safety self-checking before circular telegram | |
| CN201035103Y (en) | Vehicle mounted motorcycle electrical apparatus functional failure monitoring device | |
| CN206114751U (en) | Reactive power compensator's current test device | |
| CN106324427A (en) | Fault identification method for multi-terminal DC transmission system | |
| CN210626558U (en) | MOS voltage division detection circuit | |
| CN211375008U (en) | Series cascade circuit for fault detection of high-voltage battery management system | |
| CN208076688U (en) | A kind of air-conditioning system power quality detecting system | |
| CN207894993U (en) | A kind of protection system of three-phase electricity air-conditioner controller | |
| CN209624319U (en) | A kind of composite insulator degradation detecting device | |
| CN203396895U (en) | Cable fault diagnosis system and hydraulic support | |
| CN206756990U (en) | Automatic Testing System of Circuit Board | |
| CN205333786U (en) | Distribution cable terminal local discharge on -line monitoring system based on CAN bus | |
| CN1766659A (en) | Zero automatic detection method of positive and negative busbar insulating detection sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061115 Termination date: 20131011 |