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 type, and the connected voltage is calculated together with IA and IC to form P, Q and COS of the line 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 choose 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:
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.
2.3.3 Protection of acceleration section
The device is equipped with independent acceleration section protection, which can choose to use overcurrent acceleration section and zero sequence acceleration section protection, and can
Select whether to accelerate before or after closing through the control word, and the acceleration protection after closing includes manual closing and fault acceleration
The tripping and auto reclosing are fault accelerated tripping, and the opening time of this protection is three seconds. The front acceleration protection must be charged with NARI-RELAYS RCS-9611B_060137 line protection measurement and control device at the reclosing
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It can be put into operation only after electricity is supplied. The current setting and time setting of overcurrent acceleration section and zero sequence acceleration section of the device can be adjusted independently
Definitely.
2.3.4 Grounding protection
The device is applied to the small current grounding system. When the grounding fault occurs in the system, the zero sequence current base of the grounding fault point
This is capacitive current, and its amplitude is very small. It is difficult to ensure its selectivity by using zero sequence overcurrent relay to protect ground fault. stay
When the grounding protection is realized in this device, since the devices are interconnected through the network and the information can be shared, the upper computer is used to compare
Compare the amplitude and direction of zero sequence current fundamental wave or fifth harmonic of each line on the same bus to judge the grounding line, and connect
Issue the grounding trial command through the network to further determine the grounding circuit. The zero sequence current used for grounding line selection must be applied,
That is, the device must be provided with external input zero sequence current, and the zero sequence current produced by the device cannot be used.
In some ungrounded systems and small resistance grounded systems, the grounding zero sequence current is relatively large, and direct grounding may be adopted
Tripping method: the device is equipped with three sections of zero sequence overcurrent protection, of which zero sequence section III can be set as alarm or tripping ("zero sequence overcurrent
Current section III is enabled. When the control word is set to "0", it will only alarm, and when it is set to "1", it will trip), which is used for tripping or alarm zero
The sequence current can be self generated zero sequence current, or it can be introduced from the zero sequence CT of the device ("zero sequence current" in device parameters
When the control word "flow generated by itself" is set to "0", it means that the zero sequence current used by the device is applied, and when it is set to "1", it means that the device is used
Zero sequence current is self generated).
2.3.5 Low cycle load shedding
The device is equipped with low cycle load shedding protection with low-voltage locking and slip locking functions. The frequency must be
Low cycle protection is allowed to be put into operation within the range of 50 ± 0.5Hz. When the system fails, the frequency drops too fast and exceeds the slip
When the locking value is closed, the low cycle protection is locked instantaneously (slip locking can be selected by the control word to enable or not). Low cycle protection action is the same as
The line reclosure is locked at.
2.3.6 Re closing
There are two reclosing starting modes: non corresponding starting and protective starting. When reclosing is not switched on, setting control can be selected
Word exit, the device can select the check voltage free reclosing mode, and the voltage free setting is fixed at 30% of the rated voltage of the line; The device can also
Select the synchronous detection mode. At this time, the line voltage must have voltage, and the voltage setting is fixed at 70% of the line rated voltage
Switch on when the voltage angle difference between lines is less than the synchronous angle; The device can also select non inspection mode for reclosing. Reclosing must be charged
Input after completion, the line is in normal operation state (KKJ=1, TWJ=0), there is no external locking reclosing signal, and it will be charged after 15 seconds
When electricity is completed and reclosing is selected, the reclosing input control word must be set to "1". When no voltage detection or synchronous detection mode is selected,
There is a special control word, and one of them must be selected for input. For the reclosing non inspection mode, only the reclosing input is required
Entering the control word and exiting the synchronous detection and voltage free detection mode is the reclosing non detection mode.
The reclosing locking signals include:
a) Manual tripping (KKJ=0) b) Low cycle action c) External terminal locking input d) Remote tripping e) Control circuit disconnection f) Spring failure
Energy storage contact input (low closing pressure) g) overload tripping.
2.3.7 Device locking
When the device detects its own hardware fault or calibration error of fixed value and soft pressing plate, it will send the device fault locking signal
(BSJ relay returns), at the same time, the protection logic of the locking device, the locking device outlet, and the running light on the device panel are off.
Hardware failures include: setting error, soft strap error and power failure.
2.3.8 Abnormal operation alarm
When the device detects the following abnormal conditions, it sends out an abnormal operation signal (BJJ relay acts), and the panel alarm * * * lights up:
(1) Line voltage alarm: when the reclosing mode is no voltage detection or synchronous detection, and the line has current but no voltage, the delay will occur
The alarm line voltage is abnormal within 10 seconds;
(2) PT disconnection: a) The positive sequence voltage is less than 30 V and the line has current; b) The negative sequence voltage is greater than 8 volts; Meet any of the above NARI-RELAYS RCS-9611B_060137 line protection measurement and control device
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After the condition, it will delay 10 seconds to report the bus PT disconnection and send out the abnormal operation alarm signal. After the voltage returns to normal, the device will
Delay 1.25 seconds to automatically return PT disconnection alarm;
(3) Abnormal frequency: if the system frequency is below 49.5HZ, the alarm will be sent after a delay of 10 seconds;
(4) TWJ abnormality: if the switch is in the tripping position but the line has current, the alarm will be sent after 10 seconds;
(5) Control circuit disconnection: the device detects that there is neither tripping nor closing, and the alarm is delayed for 3 seconds;
(6) The spring does not store energy (the switch closing pressure is low): the input of the spring does not store energy is 1, and the alarm will be given after the setting delay;
(7) Zero sequence current alarm: when the zero sequence current alarm function is enabled, the zero sequence current is greater than the setting value, and it will be reported after the setting delay
Police;
(8) Overload alarm: when the overload alarm function is enabled, the current of any phase is greater than the setting value, and the alarm will be given after the setting delay;
(9) Grounding alarm: when the self generated zero sequence voltage of the device is greater than 30 V, the alarm will be delayed for 15 seconds.
2.3.9 Remote control, telemetering and remote signaling functions
There are three main remote control functions: normal remote tripping operation, normal remote closing operation, and remote tripping for grounding line selection
Operation.
Remote measurement mainly includes: UAB, UBC, UCA, IA, IC, I0, COS φ、 P. Q, F and calculation by integral
The active electric degree and reactive electric degree obtained. All these quantities are calculated and accumulated in real time locally. In which, the current is fine
The accuracy of other electrical quantities reaches grade 0.5.
The remote signaling mainly includes: 7 channels of remote signaling input, device displacement remote signaling and all protection and self checking elements act as
The sequence of events is recorded and sent via communication. The remote signaling resolution is less than 2ms and 4 channels of pulse electrical degree input.
2.3.10 Timing function
The device has software (communication message timing) and hardware second pulse timing function (GPS differential level timing or IRIG-B
Code timing).
2.3.11 Auxiliary commissioning function
The auxiliary debugging function is used for factory production debugging or on-site power failure inspection of communication and outlet circuits, which can reduce the debugging work
Work volume and shorten commissioning time. The functions of remote signaling to point, remote metering, export transmission and corresponding report recording are added.
This function can generate exit, remote signaling displacement message and telemetry data, which should be used carefully. The standard above V1.10
The program has this function, and special software programs may not have this function.
(1) Remote signaling and point-to-point function
It is used for point to point test of telecontrol and remote signaling. The operation method is: enter the "Remote signaling sequence test menu" in automatic mode
Or "Remote signaling point selection test menu" uses the point selection method to select the corresponding action elements, alarm information, protection strap, remote
Remote signaling signals such as signal input are automatically set and reset, and the generated SOE report can be viewed locally or sent to the remote via communication.
After entering the "Remote signaling sequence test menu", the remote signaling status of the device will automatically follow the remote signaling quantity entry displayed on the LCD interface
The sequence is shifted from top to bottom, and the corresponding remote signaling shift report will be formed at the same time. After the remote signaling automatic point-to-point function is completed,
Automatically exit the remote signaling test menu.
After entering the "Remote signaling selected point test menu", the user presses the "↑" or "↓" keys to browse and view
Stop at the line of the remote signaling point to be tested and press the "OK" key to conduct the remote signaling point selection test. After the test is completed, the user can
Press "Cancel" to exit the menu or continue to browse the remote signaling point and conduct the test.
(2) Telemetry data setting function
It is used for remote telemetry data value verification. Enter the "Telemetry Signal Test" menu to manually set the remote measurement data,
Check whether the remote telemetry data is consistent with the local display.
Enter the "Telemetry signal test" menu, the user presses "↑" or "↓" to browse and view, and the cursor stops
Press the "OK" key on the line of the remote measurement to be tested to test the telemetry signal. After the test is completed, the user can
Press "Cancel" to exit the menu or continue to browse the remote measurement items and carry out the test.
