Our overhead transmission line single-phase to ground fault in distribution network is more, once the line ground fault, need artificial along fault finding difficulty in finding, local geographical conditions of complicated and large, long time consuming. Therefore, the use of modern technology is simple, low cost, positioning the grounding fault point is very necessary.
The GZTC line to ground fault location system with our company in the wireless transmission technology and popular, many years of experience in power system fault detection technique of the current advanced GPRS (or SMS) communication technology, with ground fault location function. When the line to ground fault, the system specific fault location to a thread rod, rapid ground information is transmitted to the monitoring center, so that the staff make timely processing of fault.
Two, applicable scope
The GZTC line to ground fault location system for power network with various grounding operation mode, including:
1, neutral grounded system.
2, neutral grounding by resistance.
3, 10kV and below the neutral point non earthing system.
4, 10kV and below the neutral point grounding by arc suppression coil system.
The composition and principle, system three
The system includes: data acquisition terminal, the monitoring center, signal generating device.
1, collection terminal
The device is mounted in the line, collected fault signals, and with GPRS (or text) is sent to the monitor center form.
2, the monitoring center
Composed of apparatus and computer information receiving, GZTC monitoring software system is equipped with a dedicated. The information receiving device is connected to computer through communication interface. The receiving device in GPRS (or SMS) module, fault information will be sent to the computer, the computer will receive the data analysis and processing. Displays the fault line and fault location and sends out the sound alarm inform the officer on duty in a line on the wiring diagram, and mobile phone to send alarm message specified.
3, the signal generating device
The device is applied to the 10kV and the non ground neutral system and arc suppression coil grounding system. The main role is to provide GZTC line to ground fault location system provides a better criterion.
Four, monitoring center system
The monitoring center system is composed of software and hardware, mainly through collecting, recording, processing by the acquisition transmission terminal return data, ground fault event recording, automatic alarm, including:
(1) circuit diagram, monitoring point established modification
(2) shown in the current network state
(3) state query
(4) show description of the fault information in fault occurs, the alarm.
(5) the self-test
Managers use computer as the operation terminal, can understand the fault state, data query, participate in troubleshooting processing.
1, monitoring and management
Monitoring and management function of the interface is the interface of this system based, let the operator know line running through the interface, in order to detect the point as object, the query terminal parameter, set the terminal parameters, historical data and real-time waveform. In the interface, each set of terminal corresponding position, there is a group of the green icon. When using the mouse to click the icon, will display detailed information of the detection point.
2, data analysis
Data analysis function, is used for processing the monitoring data and tools. The function for the operator to view and handle data provides a set of convenient, simple, intuitive method. First of all, to enter the function interface, all the data according to the sequence of time since first backward arrangement. Methods the operator can submit "alarm" time through the input of direct access to the corresponding time data.
3, the system configuration
The system configuration function lies in the realization of:
(1) the associated configuration information acquisition and transmission terminal installation position and the software system
(2) authority management system users, and information related to the configuration
(3) the alarm information to send mobile phone No.
4, the query of historical events
Event query can display all the current and historical events, starting time said the incident occurred at a time, is convenient for the user at any time.
Five, the technical parameters
1, collection terminal
GPRS (or SMS) operating frequency: 900/1800MHz
Dimensions: 100 x 230 x 270
Environment temperature: -30 ℃ ~ 70 ℃
Protection grade: IP65
Equipment life: 10 years
2, the monitoring center
Temperature: 25 ± 5 degrees Celsius
Humidity: 20% ~ 80%
Data structure: the use of SQL Server database
Communication protocol: 104 protocol, from the station
3, the signal generating device
Voltage: 10kV and below
Zero sequence voltage starting value can be set: 20V-100V
Protection grade: IP65
Insulation level: a terminal on the casing pressure
42kV/1min
75kV lightning impulse withstand voltage of positive and negative 15 times each
The two terminals on the shell
2kV/1min
Equipment life: 10 years
Six, order
Companies need to assist the user to identify information acquisition and transmission device installation location and installation of the total number of. The two sides installation quantity, price, installation cost, mobile phone card purchase, training costs and other talks.
Seven, system maintenance
Often there is no need for users to maintain. If there is a fault, the GZTC system will be reported to the user.
