Main transformer protection panel
The Main transformer protection panel is that installed the main transformer protection and control device in a 2260*800*600 cabinet inside,Mainly composed by 9692 or 9693 (main transformer differential protection device), 9681 (main transformer high backup protection device), 9682 ( main transformer backup protection device), 9683 (main transformer low backup protection device), 9685 (main transformer of non electricity protection device) and some of the other switch components, it is mainly used in 110kV, 66kV, 35kV and below voltage main transformer protection and control.
A brief introduction of the main transformer protection
Main transformer protection panel mainly used for 110kV and below voltage of the important engineering projects, the products are mainly 9692 or 9693 (main transformer differential protection device), 9681 (main transformer high back up protection device), 9682 (main transformer backup protection device), 9683 main transformer low backup protection device, 9685 (main transformer non electricity protection device), temperature, load voltage regulating controller, thermometer, air switch, and the 2260*800*600 cabinet, product sets the communication, protection, measurement, control in a one, is the ideal choice of large capacity of main transformer
Protection function of main transformer differential protection
Differential current instantaneous protection
Proportional differential protection (with two harmonic brake, CT line-break CT
Main transformer non electric quantity protection
noumenon heavy buchholz －trip；
load light gas－alarm；
load light gas－trip；
Pressure release (throw - tripping; back alarm；
Temperature rise - alarm；
Super high temperature trip;
Main transformer backup protection
Current instantaneous trip（Jump block）,With low voltage blocking, negative sequence voltage blocking
overcurrent limit time instantaneous trip （trip all the switch of the main transformer）, With low voltage blocking, negative sequence voltage blocking
overcurrent instantaneous trip and limit instantaneous trip can be choose,direction of Alternate direction selection; time limit instantaneous trip(time limit instantaneous trip time limit instantaneous trip, low voltage lock).
Time limit quick break (time limit quick break, time limit quick break direction, low voltage lock time limit instantaneous trip（time limit instantaneous trip、direction of time limit instantaneous trip、low voltage lockout）；
CT line-break line-break（alarm）；
Zero sequence overcurrent (zero sequence overcurrent, zero sequence voltage blocking, zero sequence tripping, zero sequence direction selection
Clearance zero sequence protection；
PT no loss （alarm）；
PT line-break line-break（alarm）；
busbar grounding （alarm）；
pressure anomaly （SF6 Low pressure alarm）
Measuring and control function
busbar voltage ：Uab、Ubc、Uca；Ua、Ub、Uc；
Measuring current：Ia、 Ib、 Ic、
Control loop line-break；
manual close and trip
Remote close and trip
Optical fiber communication；
1,the main transformer protection and control cabinet used with the size2260 (or 2360) * 800 * 600 , each side panel can be mounted a layer 3 device, each layer can be installed 3 devices. The protection and monitoring devices, automatic control devices from the physical properties and spatial distribution to the main substation equipment layer, the device is a complete system with independent power supply, CPU and independent operation circuit. Complete the corresponding interval of plant protection, measurement, control and other functions, the device in soft, hardware design is completely independent, do not rely on communication network
2、Measuring and control device CPU chip using the advanced DSP chip, and take the isolation, software and hardware filter, watch dog circuit, anti-interference encoding, intelligent diagnosis, opening and locking control circuit, anti-vibration, measures of anti interference model structure design and so on many kinds of hardware and software and improve the reliability of the device
3、 the communication system, the device can be through the field bus directly connected to a microcomputer communication, also can communicate with the communication management machine, collected all kinds of information transmitted via the communication management machine to the microcomputer monitoring system; at the same time communication management machine to received various commands are transmitted to the corresponding device. Control device layer to the station a device as the control object, object oriented, comprehensive analysis of substation of information collection, processing and control requirements, distributed configuration of miniaturization, high reliability of the microcomputer protection and measurement and control device. The device is relatively independent, and substation layer communication equipment, implementation of substation integrated automation
4．Chinese characters display: the device uses a large panel liquid crystal display direct current, voltage, power and other electrical quantities required, and will protect the action of various information displayed on the panel, and record the time and size of its action
5．The clear indicator : there are seven indicator lights on the protection device, which can indicate the working status of the protection device, monitoring the status of the device and the position of the circuit breaker.
6．The operation is convenient: the protection of the protection device, the fixed value setting, data query, the opening test, open test and so on, can be directly operated on the panel of the protection device, which greatly improves the operation convenience.
7．Strong Confidentiality : the protection of the device vote, set the value of the entire set, out of the test design to the data changes and the relay out of the need to enter the password, thus greatly improving the safety of the operation
8．Fixed value setting: all the protection setting value through menu operation directly setting, set the value of the entire capital need to enter the password and permissions on the computer and microcomputer monitoring, to ensure that the whole value of safety.
9．Open operation: in accordance with the drawings corresponding to the relay circuit, all the relay out of the panel can be directly out of the operation, but they need to enter the corresponding password.
10．Data show that: the protection device is collected: the measurement of current, bus voltage and the resulting line voltage, active power, reactive power, power factor, frequency and other electrical quantities are concentrated in the LCD panel.
11．Sampling performance: protection circuit and measurement circuit have independent sampling circuit, which not only ensures the accuracy of monitoring, but also ensures the protection of anti saturation performance.
12. independent export: all export relay separately using a channel, convenient protection input and exit. Remote control, protection switching, protection tripping, accident signal, notice signal and its special signal export independently.
13．Open software: software by editing the menu, seeking protection device for the acquisition of various electric quantities, check out the running state of the load, and some of the parameters can also be set to
14．Event record: can record the latest more than 60 event information, the main component of any change has information records, and has the power to keep the function, the information can be in the event record query
15．Self preservation function: for each circuit breaker corresponds to a control circuit, an emergency can be directly on the switch operation; in addition, the device has circuit breaker tripping coil protection function, avoid due to mechanical tripping and burning coil of circuit breaker.
16Immunity performance: the device chassis are sealed, the internal double shielding, reducing the electromagnetic interference of the device.
17．Anti shock performance: all the plate parts of the protection device are closely connected with the hard plug-in unit, and fixed screws are fixed, which avoid the phenomenon of loose and fall off of the protection device in long-distance transport.
18．The replacement is strong: the protection device is powerful, with the "four remote" function, can replace the conventional relay protection, digital input mode, greatly reducing the amount of maintenance.
19．Flexible design: according to the site, designed to focus group panel type, can also be dispersedly arranged on the switch cabinet. Reliable operation: perfect self inspection system, hardware detection until the relay tripping outlet, using reliable components
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