1. Scope of Application
GTT-84X 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. Main Protection Function
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 | √ | √ | √ | √ |
Main Features
a. 4U standard aluminum chassis, combination of plug-in structure, after the plug case, each functional module design alone, electricity are completely separated, strong anti-interference ability, convenient field maintenance;
b. CPU intelligent card design, open into the open plug-ins to achieve real-time complete self-test; can be detected in each relay coil;
c. Plug-in based on CANBUS bus links between, reduce the connection between the connector plug,
bad real time detection;
d. Double 32 computer systems, the redundant system; protection function using the Dezhou Instrument Company produced the 32 bit floating-point DSP processor, program and data in the
chip operation; operation speed, high reliability;
e. Man-machine interface, network communication and other management functions
by Philips Company produced 32 ARM MCU, speed, on-chip memory capacity big,
strong ability of network interface;
f. 16 AD sampling, high measuring precision; weekly wave 48 sampling points, harmonic processing capability;
g. Protection module using computer assisted graphical interface design is convenient for the two series of products development and functional modifications, flexible, efficient engineering design;
h. Complete the circuit breaker control circuit is provided with a remote control, jump, closing, spring without stored energy blocking close function etc;
i. Use 192*64 monochrome graphic LCD, Chinese menu interface; the flexibility to choose double Ethernet and double 485 interface;
j. Can save at least 500 report recent incidents and operation report;
k. User management module using real-time multitask operating system, network interface,
tasks such as real-time;
l. Can store 10 sets of protection setting value, double value zone self-test and mutual combination, setting change safely and convenient.
m. Based on electric power industry standard DL / T667-1999 (IEC 60870-5-103) standard
communication protocol, and convenient with microcomputer monitoring or protect management computer network communication.3. Technical Index3.1 Rated Data
a. Rated DC voltage: 220V (110V orders indicate) allowable deviation +15%,-20%
Rated AC data: phase voltage 100/√3V
Zero-sequence voltage 100V
AC current 5A (1A orders indicate)
Rated frequency 50Hz (60Hz orders indicate)b. Thermal Stability:
AC voltage circuit: long time operation 1.4Un
AC current circuit: long time operation 2In
10s 20In
1s 40In3.2 Consumptiona. AC voltage circuit: phase≤0.5VA;
b. AC current circuit: when In=5A ,phase ≤1VA;when In=1A, phase≤0.5VA;
c. Protection power supply circuit: when in normal work, ≤10W; in protection action, ≤15W.3.3 Environment Conditiona. Environment temperature:
Work: -25ºC~+55ºC
Storage: -25ºC~+70ºC,Relative humidity of not more than 80%, the ambient air does not contain acidic, alkaline or other corrosive and explosive gases prevent rain, snow indoor; the limit without applying excitation volume, device is not irreversible change in appearance, temperature after recovery, device can work normally.
b. Relative humidity: Most of the wet mean monthly maximum relative humidity is 90%, and the monthly mean minimum temperature is 25ºC and the surface without gel. When the maximum temperature is +40ºC, the average maximum humidity is not more than 50%.
c. Atmospheric pressure:80kPa~110kPa(Altitude < 2km).3.4 Anti-interference Performancea. Burst Disturbance: GB/T14598.13 - 1998 1MHz 100kHz ( 2.5kV , 1kV ).Bur Test: acceptable burst disturbance tests of 1MHz and 100 kHz damped oscillation waves (first half-wave voltage
amplitude common-mode is 2.5kV and differential mode is 1kV) in GB/T14598.13 - 1998.
b. Fast Transient Disturbance Test: acceptable fast transient disturbance test whose severity level is IV in Chapter 4, GB/T14598.10 - 1997.
c. Radiated Electromagnetic Field Disturbance Test: accept radiated electromagnetic field disturbance test whose severity level is III in Chapter 4, GB/T14598.9 - 2002.
d. Electrostatic Discharge Test: acceptable electrostatic discharge test whose severity level is IV in Chapter 4, GB/T14598.14 - 1998.
e. Electromagnetic Emission Test: acceptable GB/T14598.16 - 2002 Conducted emission requirements in 4.1 and 4.2 limits the provisions of the electromagnetic radiation emission limits for emission tests.
f. Power : GB/T17626.8 - 1998 5 IV .Frequency Magnetic Field Immunity Test: acceptable power frequency magnetic field immunity tests whose severity level is IV in Chapter 5, GB/T17626.8- 1998.
g. Pulse Magnetic Field Immunity Test: acceptable pulse magnetic field immunity tests whose severity level is IV in Chapter 5, GB/T17626.9 - 1998.
h. Damped oscillatory magnetic field immunity test: accept damp oscillatory magnetic field immunity test whose severity level is IV in Chapter 5, GB/T17626.9 - 1998.
i. Surge Immunity Test: acceptable surge immunity tests whose severity level is IV in Chapter 4, IEC 60255-22-5: 2002.
j. Immunity to Conducted Disturbances Test: acceptable immunity to conducted disturbances test, induced by radio-frequency field in Chapter 4, IEC 60255-22-6: 2001
k. Power : IEC 60255-22-7 : 2003 4 .Frequency Immunity Test: acceptable power frequency
immunity tests in Chapter 4, IEC 60255-22-7: 2003.