CN203481921U - Early warning system of power grid plant station - Google Patents
Early warning system of power grid plant station Download PDFInfo
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- CN203481921U CN203481921U CN201320571798.6U CN201320571798U CN203481921U CN 203481921 U CN203481921 U CN 203481921U CN 201320571798 U CN201320571798 U CN 201320571798U CN 203481921 U CN203481921 U CN 203481921U
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Abstract
Provide in the utility model is an early warning system of a power grid plant station. The early warning system comprises a station direct-current grounding system, an equipment early warning system, and a unidirectional isolation apparatus; and the station direct-current grounding system is connected to the isolation apparatus by a communication cable with an RS232 serial port or an RS485 serial port and then is connected to the equipment early warning system by the isolation apparatus. The equipment early warning system can direct read data from the RS232 serial port or the RS485 serial port of the station direct-current grounding system without the need to read data from an NCS network control system. Moreover, because of the isolation apparatus, the equipment early warning system is effectively isolated and the e station direct-current grounding system and the NCS network control system are not influenced by the operation of the equipment early warning system, thereby substantially improving the security and stability.
Description
Technical field
The utility model relates to the technical field of electric power system, particularly relates to a kind of electrical network plant stand early warning system.
Background technology
Known station-service DC earthing system has data acquisition function, the flow process of its data acquisition transmission is, the various data such as the electric current that station-service DC earthing system obtains by various kinds of sensors, voltage, impedance, the RS232 serial ports carrying by system or RS485 serial ports are directly transferred to NCS network control system, and station-service DC earthing system data is collected to NCS network control system.And equipment early warning system need to be obtained the data of station-service DC earthing system, once station-service DC earthing system generation ground short circuit, equipment early warning system produces early warning information, as shown in Figure 1.
Equipment early warning system is obtained station-service DC earthing system data often two kinds of modes, and a kind of is from NCS network control system acquisition, and another is also directly from RS232 serial ports or the RS485 serial ports of station-service DC earthing system, directly to peek in real time.For first kind of way, because NCS belongs to network control system, there is communication with electrical network, safety requirements is too high, therefore often can not realize and provide data to other system; For the second way, can bring destabilizing factor, can cause the unstable of DC earthing system, NCS network control system and associated other system.When therefore cannot guarantee that equipment early warning system can be obtained data, guarantee the safety and stablization of other system.
Utility model content
When can obtain data for equipment early warning system, guarantee the problem of the safety and stablization of other system, the utility model proposes a kind of electrical network plant stand early warning system, make equipment early warning system without passing through NCS network control system directly from station-service DC earthing system acquisition data, can not affect the safety and stablization of other system.
A kind of electrical network plant stand early warning system, comprise: station-service DC earthing system and equipment early warning system, it is characterized in that, also comprise spacer assembly, described station-service DC earthing system is connected to described spacer assembly by the communication cable with RS232 serial ports or RS485 serial ports, then is connected to equipment early warning system by described spacer assembly.
In electrical network plant stand early warning system of the present utility model, described station-service DC earthing system is connected to described spacer assembly by the communication cable with RS232 serial ports or RS485 serial ports, then is connected to equipment early warning system by described spacer assembly.Therefore, described equipment early warning system can be directly from RS232 serial ports or the RS485 serial ports reading out data of described station-service DC earthing system, without reading out data from described NCS network control system.And owing to being provided with described spacer assembly, the effective isolation to described equipment early warning system, described station-service DC earthing system and described NCS network control system can not be subject to the operating influence of described equipment early warning system, and fail safe and stability increase greatly.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of electrical network plant stand early warning system of prior art;
Fig. 2 is the structural representation of the utility model electrical network plant stand early warning system;
Fig. 3 is the structural representation of a kind of preferred implementation of the utility model electrical network plant stand early warning system.
Embodiment
Refer to Fig. 2, Fig. 2 is the structural representation of the utility model electrical network plant stand early warning system.
Described electrical network plant stand early warning system, comprise: station-service DC earthing system 11 and equipment early warning system 13, it is characterized in that, also comprise spacer assembly 12, described station-service DC earthing system 11 is connected to described spacer assembly 12 by the communication cable with RS232 serial ports or RS485 serial ports, then is connected to equipment early warning system 13 by described spacer assembly 12.
In electrical network plant stand early warning system of the present utility model, described station-service DC earthing system is connected to described spacer assembly by the communication cable with RS232 serial ports or RS485 serial ports, then is connected to equipment early warning system by described spacer assembly.Therefore, described equipment early warning system can be directly from RS232 serial ports or the RS485 serial ports reading out data of described station-service DC earthing system, without reading out data from described NCS network control system.And owing to being provided with described spacer assembly, the effective isolation to described equipment early warning system, described station-service DC earthing system and described NCS network control system can not be subject to the operating influence of described equipment early warning system, and fail safe and stability increase greatly.
In the utility model, described station-service DC earthing system 11 is provided with RS232 serial ports or RS485 serial ports, and the RS232 serial ports of described communication cable or RS485 serial ports are connected to RS232 serial ports or the RS485 serial ports of described station-service DC earthing system 11.Described station-service DC earthing system 11, by described RS232 serial ports or RS485 serial ports output monitoring data, transfers to described equipment early warning system 13 after described spacer assembly 12.
Described spacer assembly 12 is unidirectional spacer assembly, and its connected mode is from described station-service DC earthing system 11 to described equipment early warning system 13 one-way conductions, from described equipment early warning system 13 to described station-service DC earthing system 11 unidirectional isolation.Those skilled in the art can adopt unidirectional spacer assembly as described in the realizations such as switching tube circuit.The data that described station-service DC earthing system 11 sends, by described spacer assembly 12 conductings, transfer to described equipment early warning system 13; The noise that described equipment early warning system 13 is brought or interference, by described spacer assembly 12 isolation, can not affect described station-service DC earthing system 11, can not have influence on other system yet.
Described equipment early warning system 13 receives by the data after described spacer assembly 12, and according to data, carries out the early warning of DC ground fault.
In a preferred implementation, described station-service DC earthing system 11 comprises transmitting terminal device 110, described equipment early warning system 13 comprises receiving end device 130, described transmitting terminal device 110 is connected to described spacer assembly 12 by the communication cable with RS232 or RS485 serial ports, and then is connected to described receiving end device 130.As shown in Figure 3.
Described transmitting terminal device 110 preferably includes for gathering the data acquisition module of the monitor data of station-service DC earthing system, for sending the data transmission blocks of described monitor data, and for detection of the impedance detection module of the impedance of station-service DC earthing system.Described data acquisition module is connected described data transmission blocks with described impedance detection module.Described impedance detection module is sent triggering signal to described data transmission blocks when the impedance detecting is greater than threshold value, triggers described data sending device and sends monitor data.
Described data acquisition module can comprise the transducers such as current sensor, voltage sensor and impedance transducer, by above-mentioned various kinds of sensors, obtain the various data such as electric current, voltage, impedance of station-service DC earthing system, and by the transfer of data gathering to described data transmission blocks.
Described impedance detection module can adopt in this area conventional various impedance collection means to realize, for example, voltage detecting is set and current detecting instrument obtains input voltage and output current, thus computing impedance etc.Described impedance detection module also has triggering signal output circuit, comparator circuit for example, the impedance of more described station-service DC earthing system and default impedance threshold size, when the impedance of described station-service DC earthing system is greater than default impedance threshold, triggering signal output circuit sends triggering signal to described data transmission blocks, and for example comparator circuit is according to the low and high level signal of two comparison value outputs of input.
Described data transmission blocks can have data storage, trigger switch and output circuit, data storage stores the data of described data acquisition module input, trigger switch receives triggering signal of living in and connects described output circuit, exports the data of described data storage storage to described spacer assembly 12.
Under normal circumstances, when each branch road of station service earth fault does not occur, the resistance value of station-service DC earthing system is infinitely great, can set and be judged as 999.99 ohm; Once generation ground fault condition, the resistance value of station-service DC earthing system is varied down to 99.99 Europe gradually, even lower.Therefore can be <=100 Europe by the Threshold of impedance, once be less than or equal to 100 Europe, carry out immediately the data acquisition transmission of station-service DC earthing system, for early warning system provides data analysis.
By described transmitting terminal device 110, according to the communication protocol of station-service DC earthing system, the numerical value of the critical index data that Real-time Obtaining sets, critical index data are carried out to identification, by to critical index setting parameter threshold value, when reaching the threshold range of setting, all supplemental characteristics are collected to equipment early warning system, carry out the early warning analysis of DC ground fault.Will not gather when the numerical value of critical index parameter is outside threshold range, like this when collecting the data that need, reform through docking port acquisition mode, can solve and carry out station-service DC earthing system data while collecting equipment early warning system, unstable and the fail safe large and that may cause of factor data amount is worried, has guaranteed the stability of station-service DC earthing system operation and the fail safe of NCS.
As a kind of preferred implementation, described electrical network plant stand early warning system also comprises NCS network control system 14, and by another, the communication cable with RS232 or RS485 serial ports is connected to described NCS network control system 14 to described station-service DC earthing system 11.
Electrical network plant stand early warning system of the present utility model, reduce data acquiring frequency, guaranteed the station-service DC earthing stability of a system, reduced while providing station-service DC earthing data for equipment early warning system, may cause the impact on the stability influence of station-service DC earthing system itself and NCS network control security of system, not disturb the fail safe of NCS network control system.
In the situation that may there is DC earthing in power plant, effectively obtain station-service DC earthing system related data, for equipment early warning system provides valid data, carry out the early warning analysis of station-service direct current earth fault.In the situation that same network environment, system configuration, the utility model can accomplish that data effectively gather and do not affect the stability of station-service DC earthing system operation, the fail safe of other interconnected systems.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (8)
1. an electrical network plant stand early warning system, it is characterized in that, comprise: station-service DC earthing system and equipment early warning system, it is characterized in that, also comprise spacer assembly, described station-service DC earthing system is connected to described spacer assembly by the communication cable with RS232 serial ports or RS485 serial ports, then is connected to equipment early warning system by described spacer assembly.
2. electrical network plant stand early warning system as claimed in claim 1, it is characterized in that: described station-service DC earthing system is provided with RS232 serial ports or RS485 serial ports, the described communication cable with RS232 serial ports or RS485 serial ports is connected to RS232 serial ports or the RS485 serial ports of described station-service DC earthing system.
3. electrical network plant stand early warning system as claimed in claim 1, it is characterized in that: described spacer assembly is unidirectional spacer assembly, its connected mode is from described station-service DC earthing system to described equipment early warning system one-way conduction, from described equipment early warning system to the unidirectional isolation of described station-service DC earthing system.
4. electrical network plant stand early warning system as claimed in claim 1, it is characterized in that: described station-service DC earthing system comprises transmitting terminal device, described equipment early warning system comprises receiving end device, and described transmitting terminal device is connected to described receiving end device by the communication cable with RS232 or RS485 serial ports.
5. electrical network plant stand early warning system as claimed in claim 4, it is characterized in that: described transmitting terminal device comprises for gathering the data acquisition module of the monitor data of station-service DC earthing system, for sending the data transmission blocks of described monitor data, and for detection of the impedance detection module of the impedance of station-service DC earthing system;
Described data acquisition module is connected described data transmission blocks with described impedance detection module.
6. electrical network plant stand early warning system as claimed in claim 5, is characterized in that: described data acquisition module comprises current sensor, voltage sensor and impedance transducer.
7. electrical network plant stand early warning system as claimed in claim 5, is characterized in that: described impedance detection module is sent triggering signal to described data transmission blocks when the impedance detecting is greater than threshold value, triggers described data sending device and sends monitor data.
8. the electrical network plant stand early warning system as described in claim 1 to 7 any one, it is characterized in that: described electrical network plant stand early warning system also comprises NCS network control system, by another, the communication cable with RS232 or RS485 serial ports is connected to described NCS network control system to described station-service DC earthing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320571798.6U CN203481921U (en) | 2013-09-13 | 2013-09-13 | Early warning system of power grid plant station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320571798.6U CN203481921U (en) | 2013-09-13 | 2013-09-13 | Early warning system of power grid plant station |
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| Publication Number | Publication Date |
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| CN203481921U true CN203481921U (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320571798.6U Expired - Fee Related CN203481921U (en) | 2013-09-13 | 2013-09-13 | Early warning system of power grid plant station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229975A (en) * | 2020-10-29 | 2021-01-15 | 上海凯泉泵业（集团）有限公司 | Water quality on-line monitoring device and monitoring method |
-
2013
- 2013-09-13 CN CN201320571798.6U patent/CN203481921U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229975A (en) * | 2020-10-29 | 2021-01-15 | 上海凯泉泵业（集团）有限公司 | Water quality on-line monitoring device and monitoring method |
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