CN202997496U - Metro direct-current protection apparatus - Google Patents
Metro direct-current protection apparatus Download PDFInfo
- Publication number
- CN202997496U CN202997496U CN 201220711853 CN201220711853U CN202997496U CN 202997496 U CN202997496 U CN 202997496U CN 201220711853 CN201220711853 CN 201220711853 CN 201220711853 U CN201220711853 U CN 201220711853U CN 202997496 U CN202997496 U CN 202997496U
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- China
- Prior art keywords
- isolation
- voltage
- unit
- operational amplifier
- amplifying unit
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- 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 - Lifetime
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Abstract
Disclosed in the utility model is a metro direct-current protection apparatus that comprises a voltage conversion unit, an isolation amplification unit and a data processing unit. The isolation amplification unit is used for collecting a voltage analog quantity obtained by conversion of the voltage conversion unit and a current analog quantity obtained by conversion of a shunt installed on a direct-current feeder line and sending the collected analog quantities to the data processing unit. Besides, the isolation amplification unit includes an isolation transformer and a high-voltage isolation operational amplifier; the isolation transformer is externally connected with the power supply of the isolation amplification unit; and the high-voltage isolation operational amplifier is installed at a front end of a measuring loop of the isolation amplification unit. According to the utility model, because the high-voltage isolation operational amplifier is installed in the isolation amplification unit, the security level of the high-voltage isolation of the isolation amplification unit can be improved, thereby preventing the personal injury and equipment damage due to the faults on the isolation transformer and the related loop thereof.
Description
Technical field
The utility model belongs to the power supply technical field, is specifically related to a kind of direct current protecting device that is applied to subway.
Background technology
usually adopt 750V or 1500V direct current supply in the subway DC power-supply system, and usually adopt the direct current protecting device to excise the fault of DC power-supply system, the direct current protecting device generally includes voltage conversion unit, isolation amplifying unit and data processing unit, wherein voltage conversion unit is used for the high-voltage direct-current analog quantity is converted to the low-voltage direct-current analog quantity, the isolation amplifying unit be used for to gather this low-voltage direct-current voltage and from the voltage analog that is used for the reflection direct current of shunt, data processing unit is for the treatment of the analog quantity of coming the self-isolation amplifying unit, protect computing, if the fault of judging, just send trip command, the tripping dc circuit breaker.
but, the voltage and current analog quantity of isolating amplifying unit due to the access of direct current protecting device comes from 750V or 1500V DC power-supply system, therefore need to carry out safe isolation to 750V or the high-tension analog quantity of 1500V, usually take in prior art isolating by isolating transformer to the power supply of isolation amplifying unit power supply, again the analog quantity that collects is arrived data processing unit by Optical Fiber Transmission, making the isolation amplifying unit be isolated comes, but the problem that exists is, relying on isolating transformer fully reaches high pressure is isolated, if isolating transformer and associated loop thereof go wrong, to directly work the mischief to the person and equipment.
The utility model content
The purpose of this utility model is to overcome deficiency of the prior art, at the front end of isolation amplifying unit measuring circuit, high pressure isolation operational amplifier has been installed, can improve the lsafety level of the high pressure isolation of isolation amplifying unit, prevent the break down harm of the caused person and equipment of isolating transformer and associated loop thereof.
In order to achieve the above object, the technical scheme that adopts of the utility model is:
a kind of subway direct current protecting device, comprise voltage conversion unit, isolation amplifying unit and data processing unit, described voltage conversion unit is connected with data processing unit by the isolation amplifying unit, it is characterized in that: described isolation amplifying unit comprises isolating transformer and high pressure isolation operational amplifier, the power supply of the external isolation amplifying unit of described isolating transformer, described high pressure isolation operational amplifier is arranged on the front end of the measuring circuit of isolation amplifying unit, be used for gathering the current analog amount that voltage conversion unit the conversion voltage analog that comes and the shunt conversion that is arranged on dc feeder come.
Aforesaid a kind of subway direct current protecting device is characterized in that: described high pressure isolation operational amplifier is not less than the operational amplifier of the crest voltage of positive and negative 2000V for tolerance.
Aforesaid a kind of subway direct current protecting device, it is characterized in that: described isolation amplifying unit carries out communication by optical fiber and described data processing unit.
Comparing with the special product that isolating transformer is coiling, is the universal product due to what isolate the amplifying unit employing for high pressure isolation operational amplifier, and the crest voltage of its withstand long term exposure is nominal value, is easy to test, easily controls product quality and high-voltage resistance capability.
In the isolation amplifying unit, by adopting general high voltage bearing isolation operational amplifier, add special-purpose isolated amplifier, make the lsafety level of the high pressure isolation of isolation amplifying unit be greatly improved, guaranteed the safety of the person and equipment.
The beneficial effects of the utility model are: the utility model has been installed high pressure isolation operational amplifier in the isolation amplifying unit; can improve the lsafety level of the high pressure isolation of isolation amplifying unit; prevent the break down harm of the caused person and equipment of isolating transformer and associated loop thereof; and adopt optical fiber and data processing unit to carry out communication; transfer rate is fast; improve the real-time of the data acquisition of subway direct current protecting device, have a good application prospect.
Description of drawings
Fig. 1 is the system diagram of subway direct current protecting device of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
as shown in Figure 1, a kind of subway direct current protecting device, comprise voltage conversion unit, isolation amplifying unit and data processing unit, the isolation amplifying unit is used for gathering the next voltage analog of voltage conversion unit conversion and is arranged on the current analog amount that the shunt conversion on dc feeder comes, and the analog quantity that gathers is sent to data processing unit, the isolation amplifying unit comprises isolating transformer and high pressure isolation operational amplifier, the isolating transformer external power supply, high pressure isolation operational amplifier is installed the front end of the measuring circuit of isolation amplifying unit, gather the current analog amount that voltage conversion unit the conversion voltage analog that comes and the shunt conversion that is arranged on dc feeder come, the high pressure isolation operational amplifier here just is not less than for tolerance, the operational amplifier of the crest voltage of negative 2000V, only containing isolating transformer with traditional isolation amplifying unit compares, increase high pressure isolation operational amplifier, can prevent the break down harm of the caused person and equipment of isolating transformer and associated loop thereof, can improve the lsafety level of the high pressure isolation of isolation amplifying unit, guarantee the safety of the person and equipment, high pressure isolation operational amplifier also has the test of being easy to, the characteristics of stable performance, be easy to guarantee stable withstand voltage level, be conducive to safety.
Described isolation amplifying unit carries out communication by optical fiber and described data processing unit; data processing unit comprises protection, measurement, communication, four modules of demonstration; and be connected with background monitoring system; be convenient to staff's remote monitoring; accept remote worker's control signal; control dc circuit breaker on dc feeder deciliter, control the power supply of DC power-supply system.
Above demonstration and described basic principle of the present utility model, principal character and advantage.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is by appending claims and equivalent circle thereof.
Claims (3)
1. subway direct current protecting device, comprise voltage conversion unit, isolation amplifying unit and data processing unit, described voltage conversion unit is connected with data processing unit by the isolation amplifying unit, it is characterized in that: described isolation amplifying unit comprises isolating transformer and high pressure isolation operational amplifier, the power supply of the external isolation amplifying unit of described isolating transformer, described high pressure isolation operational amplifier is arranged on the front end of the measuring circuit of isolation amplifying unit, be used for gathering the current analog amount that voltage conversion unit the conversion voltage analog that comes and the shunt conversion that is arranged on dc feeder come.
2. a kind of subway direct current protecting device according to claim 1 is characterized in that: described high pressure isolation operational amplifier is not less than the operational amplifier of the crest voltage of positive and negative 2000V for tolerance.
3. a kind of subway direct current protecting device according to claim 1, it is characterized in that: described isolation amplifying unit carries out communication by optical fiber and described data processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220711853 CN202997496U (en) | 2012-12-21 | 2012-12-21 | Metro direct-current protection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220711853 CN202997496U (en) | 2012-12-21 | 2012-12-21 | Metro direct-current protection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202997496U true CN202997496U (en) | 2013-06-12 |
Family
ID=48568628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220711853 Expired - Lifetime CN202997496U (en) | 2012-12-21 | 2012-12-21 | Metro direct-current protection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202997496U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377661B (en) * | 2014-11-14 | 2017-03-22 | 中国北车集团大连机车车辆有限公司 | Low-voltage protection circuit of urban rail vehicle direct-current power source |
| CN107834524A (en) * | 2017-11-17 | 2018-03-23 | 南京国电南自轨道交通工程有限公司 | A kind of subway direct current protecting device based on pulse signal monitoring |
| CN109709416A (en) * | 2018-12-11 | 2019-05-03 | 南京南瑞继保电气有限公司 | A kind of subway direct current test apparatus and test method |
| CN110887991A (en) * | 2018-08-21 | 2020-03-17 | 西安西电高压开关有限责任公司 | Current measuring device |
-
2012
- 2012-12-21 CN CN 201220711853 patent/CN202997496U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377661B (en) * | 2014-11-14 | 2017-03-22 | 中国北车集团大连机车车辆有限公司 | Low-voltage protection circuit of urban rail vehicle direct-current power source |
| CN107834524A (en) * | 2017-11-17 | 2018-03-23 | 南京国电南自轨道交通工程有限公司 | A kind of subway direct current protecting device based on pulse signal monitoring |
| CN107834524B (en) * | 2017-11-17 | 2019-03-08 | 南京国电南自轨道交通工程有限公司 | A kind of subway direct current protecting device based on pulse signal monitoring |
| CN110887991A (en) * | 2018-08-21 | 2020-03-17 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN110887991B (en) * | 2018-08-21 | 2022-06-10 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN109709416A (en) * | 2018-12-11 | 2019-05-03 | 南京南瑞继保电气有限公司 | A kind of subway direct current test apparatus and test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |