Verified Company
Changsha Guotong Electrical Technology Co., Ltd.
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1. Scope of Application
GTT-8XX series digital transformer protection measurement and control device, mainly applies to 110kV and the following various voltage levels two / three coil transformer protection device. GTT-84(2) X series device includes: GTT-84(2)1 differential protection device, GTT-84(2)2 high backup protection measurement and control device is composed of transformer protection system.
2. Function and Characteristics
Functional Configuration Table
Classify | Function Name | 84(2)1 | 822 | 842 | 84(2)3 |
Protection Function | Sent velocity broken | √ |
|
|
|
Percentage differential protection(secondary harmonic restraint) | √ |
|
|
| |
TA disconnexion blocking percentage differential protection | √ |
|
|
| |
The differential current limit alarm | √ |
|
|
| |
Compound voltage blocking Two sections of three time overcurrent protection |
| √ | √ | √ | |
Overcurrent inverse time lag |
| √ | √ | √ | |
Negative sequence over current |
| √ | √ | √ | |
Overload |
| √ | √ | √ | |
Overload blocking voltage regulation |
| √ | √ | √ | |
Overload start air-cooled |
| √ | √ | √ | |
Proper signal |
| √ | √ |
| |
Transformer tap position and on-load voltage regulation | √ |
|
|
| |
Zero-sequence voltage protection |
| √ | √ | √ | |
A three zero-sequence current protection |
| √ |
|
| |
Composite voltage components |
| √ | √ | √ | |
TV disconnection detect |
| √ | √ | √ | |
Operation circuit | Power independent containing anti adjustable locking function operation circuit |
| √ | √ | √ |
Control circuit abnormal alarm |
| √ | √ | √ | |
Measurement And Control Function | 16 way remote signal input, device remote signal shift, accident remote signal | √ | √ | √ | √ |
Normal circuit break remote deciliter | √ | √ | √ | √ | |
P, Q, IA, IB, IC, Ua, Ub, Uc, COSΦ, f |
| √ | √ | √ | |
Switch accident in statistics and event SOE etc | √ | √ | √ | √ | |
Fault recorder | √ | √ | √ | √ | |
Time hack | Realize GPS time hack,network time hack | √ | √ | √ | √ |
Communication | Ethernet, RS232/485 communication interface | √ | √ | √ | √ |