1.1 Basic Configuration
RCS-9611B is applicable to low current grounding system with voltage level below 35kV (neutral point is not grounded or passes through arc suppression wire
Loop grounding system) and neutral point grounding system through resistance. It can be installed by screen assembly or
Locally mounted to the switchgear.
(1) Main functions of protection
a) Three sections of fixed time limit directional overcurrent protection that can be locked by low-voltage (the third section can be set as inverse time limit, with
Three kinds of inverse time characteristics can be selected, and the inverse time can also be locked by direction or low voltage);
b) Three section zero sequence overcurrent protection (zero sequence current can be applied or self generated zero sequence current can be used, of which the third section
It can be selected as alarm or tripping function through setting)/small current grounding line selection (external zero sequence current must be used);
c) Three phase one-time reclosing (synchronous detection, no voltage detection or no detection mode can be selected);
d) Overload protection (can be selected as alarm or tripping function through setting);
e) Independent overcurrent/zero sequence current closing acceleration protection (front acceleration or rear acceleration);
f) Decentralized low cycle load shedding protection function;
g) Independent operation circuit.
(2) Main functions of measurement and control
a) 7 channels of remote signaling input acquisition, device remote signaling displacement, accident remote signaling;
b) Remote opening and closing of normal circuit breaker, and remote opening and closing of small current grounding detection;
c) Telemetry of 10 analog quantities such as UAB, UBC, UCA, IA, IC, I0, P, Q, COS ф, F, etc;
d) Statistics of switch accident opening and closing times and event SOE, etc;
e) 4-channel pulse input
(3) Key functions in protecting information
a) Remote viewing of device description;
b) Remote viewing of device parameters;
c) Remote view and modification function of protection setting value and area code;
d) Remote viewing, enabling and disenabling of the soft strap status of the protection function;
e) Remote view of device protection input status;
f) Remote view of device operation status (including the status of protective action elements and device self inspection information);
g) Realize signal reset for the device remotely;
h) Fault recording (including waveform data upload) function.
(4) Auxiliary debugging function
a) Remote signaling point-to-point and corresponding report recording function
b) Telemetry setting and corresponding report recording function
c) Export drive and corresponding report recording function.
1NARI-RELAYS RCS-9611B_060137 Line Protection Measurement and Control Device
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1.2 Technical data
1.2.1 Rated data
DC power supply: 220V, 110V, allowable deviation 15%, - 20%
AC voltage: 100/3 V (phase voltage), 100 V (line voltage)
AC current: 5A, 1A
Frequency: 50Hz
1.2.2 Power consumption
AC voltage:<0.5VA/phase
AC current:<1VA/phase (In=5A)
<0.5VA/phase (In=1A)
DC: normal<15W
Trip<25W
1.2.3 Main technical indicators
(1) Definite time overcurrent
a) Fixed value of phase current:
0.1In～20In
b) Zero sequence current setting:
0.02～12.00A
c) Time setting:
0.0～100.0S
d) Current setting error:
< 5％
e) Time setting error:<1% setting value 30ms
(2) Reclosing
a) Reclosing time:
0.1～9.9S
b) Time setting error:
<1% setting value 30ms
(3) Low cycle load shedding
a) Low cycle setting:
45Hz～50Hz
b) Low voltage locking:
10V～90V
c) Df/dt locking: 0.3Hz/s ～ 10Hz/s
d) Setting error:
< 5％
e) Frequency error:
< 0.01Hz
f) Df/dt error:
<± 10% setting value
g) Time setting error:
<1% setting value 20ms
(4) Telemetering metering level
a) Current:
Grade 0.2
b) Others:
Grade 0.5
(5) Remote signaling resolution:
<2ms
Signal input mode:
Passive contact
2. Device principle
2.1 Device size
See the appendix for the size of the device, and see the attached figure RCS-9611B for the hardware configuration and logic block diagram. NARI-RELAYS RCS-9611B_060137 Line Protection Measurement and Control Device
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2.2 Analog input
After the external current and voltage input is isolated and transformed by the isolation transformer, it is input to the analog digital converter by the low-pass filter,
After sampling and digital processing, the CPU forms various protection relays and calculates various remote measurements.
Ia, Ib, Ic, Ios inputs are analog inputs for protection, IA, IC are special measurement CT inputs for measurement,
Ensure that the remote measurement has sufficient accuracy. Ios zero sequence current input can be used for zero sequence overcurrent protection (alarm or tripping
It is also used as the input for small current grounding line selection. The connection of zero sequence current is better with special zero sequence current transformer
If there is no special zero sequence current transformer, before the zero sequence current can meet the protection selectivity requirements of small grounding system
The sum of three phase current is the neutral current of CT.
UA, UB and UC inputs are used as voltage inputs for low cycle protection and measurement in the device, and the voltage can be connected in Y mode,
It can also be connected in V mode. The connected voltage, together with IA and IC, forms P, Q, COS ф, Kwh
Kvarh et al. If the remote measurement of this line is only electric flow and the low cycle protection function is not used, UA, UB and UC can be disconnected,
To prevent the device from sending PT disconnection signal, just set the control word in the setting table as PT disconnection check exit. Ux is installed locally
Centering is used as the synchronous or non voltage input of the reclosing detection line, and the line voltage is connected (rated 100v or 57.7v).
2.3 Software description
2.3.1 Definite time overcurrent protection
The device is equipped with three sections of definite time overcurrent protection. The current and time settings of each section can be independently set, and the setting control can be set separately
Word making controls the enabling and disenabling of these three sections of protection. Among them, the overcurrent section III can select whether to adopt fixed time limit or inverse time through the control word FSX
Limit (under the premise that overcurrent section III is enabled, if FSX control word 1 is enabled, it means that overcurrent section III is used as inverse time limit section
use; If FSX control word is set to 0 to exit, it means that overcurrent section III is used as timing overcurrent)
Committee (IEC255-4) and British Standard Specification (BS142.1996) generally recommend the use of
Time limit characteristic equation:
General inverse time characteristic:
（3）
In the above three equations, IP is the reference value of inverse time characteristic current, and tP is the inverse time characteristic time constant. Reverse in this device
The time limit characteristic is also based on the three standard characteristics, which can be selected through the inverse time limit characteristic setting FSXTX (setting
If it is set to 1, select general inverse time characteristic; if it is set to 2, select very inverse time characteristic; if it is set to 3, select extreme inverse time characteristic
Time limit characteristics).
Three section current protection can be locked by low-voltage or direction (each section has independent control word selection),
Three section current protection can be locked by low-voltage or direction (each section has independent control word selection),
The sensitivity angle of directional element is 45 degrees.
2.3.2 Overload protection
Overload protection action can be set by overload input control word. When the control word is set to "0", only alarm signal will be sent
No., when it is set to "1", it will trip and block and reclose.
