Automatic Voltage Regulating Relay
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Automatic Voltage Regulating Relay Model M 98 Automatic
OLTC Controller
Introduction
Introduction
The Micro-Controller Based Automatic Voltage Regulating Relay
Model M98 is used for regulating the secondary voltage of Power Transformer
with on load tap changer. The required dead band settings are set by low
voltage & high voltage parameters. The time delay setting is set by delay
parameter. The delay parameter use for momentary fluctuations of the regulated
voltage. The reducing the number of operations of the tap changer.
When the regulated voltage falls below the under voltage limit, the control relays are automatically blocked i.e. there is no voltage correction & under voltage relay is open contact positions.
The Instrument has following features:
1. 2 Digit display : For Tap Position
2. 4 Digit display : For PT Voltage
3. Readable 5 digit tap position change counter
4. Under voltage Message display
5. Over voltage message display
6. 2 Relay contact 5 Amp. 240V provided for Voltage increase & Decrees.
7. 1 Relay contact( normally close) provided for under voltage.
8. D type 9 pin female connector provided for computer interfacing.
2. 4 Digit display : For PT Voltage
3. Readable 5 digit tap position change counter
4. Under voltage Message display
5. Over voltage message display
6. 2 Relay contact 5 Amp. 240V provided for Voltage increase & Decrees.
7. 1 Relay contact( normally close) provided for under voltage.
8. D type 9 pin female connector provided for computer interfacing.
General Description
The dead-band (band width) can be set by setting low Voltage &
High Voltage limits in parameter 1 (P1) parameter2 (P2). The desired time delay
can be set in delay parameter (P3)
Operation of the voltage increase relay is automatically inhibited when the voltage falls below the specified under voltage limit or if PT fail.
Operation of the voltage increase relay is automatically inhibited when the voltage falls below the specified under voltage limit or if PT fail.
Specifications
* Main (Auxiliary Supply)
110V + 15% 50 HZ, 12VA
* PT Supply
110V AC, 50HZ, 1 VA
* High Voltage Setting
Settable 95V to 129V
* Low Voltage Setting
Settable 90V to 120V
* Time Delay Setting
Settable 10 – 199 Second
* Under Voltage Blocking
Internal blocking at 80V Restoration at 85V
* Control Relays
One pair of normally open potential free contacts ,Rating 5A at 240 VAC or 24 DC resistive load
* Control Operation
Single Pulse operation with 2 second (App.) time
* Operating Temp.
0 – 45 deg. C
* Panel Cutout
* Overall size
90 X 184 mm (HXW)
92x192x220 mm (HxWxD)
110V + 15% 50 HZ, 12VA
* PT Supply
110V AC, 50HZ, 1 VA
* High Voltage Setting
Settable 95V to 129V
* Low Voltage Setting
Settable 90V to 120V
* Time Delay Setting
Settable 10 – 199 Second
* Under Voltage Blocking
Internal blocking at 80V Restoration at 85V
* Control Relays
One pair of normally open potential free contacts ,Rating 5A at 240 VAC or 24 DC resistive load
* Control Operation
Single Pulse operation with 2 second (App.) time
* Operating Temp.
0 – 45 deg. C
* Panel Cutout
* Overall size
90 X 184 mm (HXW)
92x192x220 mm (HxWxD)
* Weight
1.5 K Approx.
Indication
1.5 K Approx.
Indication
1
High Voltage LED
PT Voltage Exceeds the Set H. limit
2
Low Voltage LED
PT Voltage falls below set L. limit
3
Delay LED
Delay in Progress
4
Pc. Com LED
When PC connected
5
Voltage increase LED
Relay is energized
6
Voltage Decrease LED
Relay is energized
High Voltage LED
PT Voltage Exceeds the Set H. limit
2
Low Voltage LED
PT Voltage falls below set L. limit
3
Delay LED
Delay in Progress
4
Pc. Com LED
When PC connected
5
Voltage increase LED
Relay is energized
6
Voltage Decrease LED
Relay is energized
Controls
1
Power – On
This is Rocker switch when “on” supplies Auxiliary voltage (Maine)
Operating Instructions
Power – On
This is Rocker switch when “on” supplies Auxiliary voltage (Maine)
Operating Instructions
1. Check the PT Auxiliary (Main) fuse connect the PT &
Auxiliary supply to the appropriate terminals (PT I/P) and mains of the rear
panel terminal block. In case separate main supply is not available, then the
same PT supply can be connected both PT & mains terminals. Leave the unit
ON for 5 minutes before making any new sitting.
2. Dead Band Settings :
2. Dead Band Settings :
Set the High Voltage and low voltage setting the setting are made
through the front panel touch dome switches
3. Under Voltage Blocking
This is factory set at 80V, Note that between blocking and the
release (Restoration) a hysterics 5V has been provided.
4. Time Delay:
Time is a variable content with variation from 10 to 199 Sec.
Programming parameters:
Time is a variable content with variation from 10 to 199 Sec.
Programming parameters:
Parameter(P2)
In this parameter user can be set low voltage Limit .(90-120v)
In this parameter user can be set low voltage Limit .(90-120v)
Parameter (P1)
In this parameter user can be set high voltage Limit (95-129v)
In this parameter user can be set high voltage Limit (95-129v)
Parameter (P3)
In this parameter user can be set Delay time (10-199seconds)
In this parameter user can be set Delay time (10-199seconds)
Parameter (P4)
In this parameter user can be set over voltage range limit.
Not use in this instrument.
In this parameter user can be set over voltage range limit.
Not use in this instrument.
Parameter (Tap)
In this parameter user can be calibrate tap position
Calibration:
Select tap parameter and press setkey display 0000
Now actual tap position feed on display by use up key(0-9)/shift(digit select) key and press and hold cntkey then press set key for 1 seconds after release both key now tap calibration complete.
AC voltage calibration (PT voltage)
In this parameter user can be calibrate PT voltage
Calibration:
Select AC parameter and press setkey display 000.0
Now actual PT voltage feed on display by use up key(0-9)/shift key(digit select) key and press and hold cntkey then press set key for 1 seconds after release both key now PT voltage calibration complete
In this parameter user can be calibrate tap position
Calibration:
Select tap parameter and press setkey display 0000
Now actual tap position feed on display by use up key(0-9)/shift(digit select) key and press and hold cntkey then press set key for 1 seconds after release both key now tap calibration complete.
AC voltage calibration (PT voltage)
In this parameter user can be calibrate PT voltage
Calibration:
Select AC parameter and press setkey display 000.0
Now actual PT voltage feed on display by use up key(0-9)/shift key(digit select) key and press and hold cntkey then press set key for 1 seconds after release both key now PT voltage calibration complete
Control Relays
Connect the respective voltage increase & voltage decrease N/O
Contacts on the rear Panel Terminal Blocks (LR, C, and RR)
Terminal details
C = Common Terminal
LR = Voltage Decrease relay
RR = Voltage Increase relay
UV = under voltage relay
Mains = 110 volts AC
PT = 110 volts AC
TAP = Tap resistance input (0-20k)
C = Common Terminal
LR = Voltage Decrease relay
RR = Voltage Increase relay
UV = under voltage relay
Mains = 110 volts AC
PT = 110 volts AC
TAP = Tap resistance input (0-20k)
The Operational safety, increase and decrease relays are interred
locked and hence OLTC will never receive two opposite commands simulations.
Factory Set Parameters
* High Voltage setting = 112.0 V
* Low Voltage Setting = 108.0 V
* Time Delay Setting = 10 Second
* Under Voltage Set = 80.0 v
* Over voltage setting = 125.5v
Factory Set Parameters
* High Voltage setting = 112.0 V
* Low Voltage Setting = 108.0 V
* Time Delay Setting = 10 Second
* Under Voltage Set = 80.0 v
* Over voltage setting = 125.5v
Tap Position Indicator
2 Digit Display Provided for Tap Position Indication.
2 Digit Display Provided for Tap Position Indication.
Tap Position Change Counter
This is user readable parameter, in this parameter user may be read tap change position counter as on the display by pressing CNTS key on the side of the front panel on doing this, four digits are displayed in place of volts display and the fifth digit of the counter display on the tap position digits.
Parameter Setting Procedure
Press set key for 2 second, now display P1 (Parameter1) on tap position digits and again press & release set key now display last store value (high voltage set) user can be set desired value by use shift and set key. And press/release set key to store modified value and display next parameter. Same procedure apply parameter P2 & P3,P4 and after press/release set key now display P1 on tap position display ,If Exit from programming then press CNts key But p1 parameter should be in Seth position display.
*Shift key use for digit selection
*Upkey use for value change 0-9
This is user readable parameter, in this parameter user may be read tap change position counter as on the display by pressing CNTS key on the side of the front panel on doing this, four digits are displayed in place of volts display and the fifth digit of the counter display on the tap position digits.
Parameter Setting Procedure
Press set key for 2 second, now display P1 (Parameter1) on tap position digits and again press & release set key now display last store value (high voltage set) user can be set desired value by use shift and set key. And press/release set key to store modified value and display next parameter. Same procedure apply parameter P2 & P3,P4 and after press/release set key now display P1 on tap position display ,If Exit from programming then press CNts key But p1 parameter should be in Seth position display.
*Shift key use for digit selection
*Upkey use for value change 0-9
Key Operation
By pressing SET key, Digit fleshing. The fleshing can be shift to next digit by pressing
Shift key.
By pressing UP key fleshing digit value can be change from 0 to 9, and again press SET key for store modified value.
By pressing SET key, Digit fleshing. The fleshing can be shift to next digit by pressing
Shift key.
By pressing UP key fleshing digit value can be change from 0 to 9, and again press SET key for store modified value.
Note
At the time of programming mode, if user not touch any key for some time then system automatically Exist programming mode.
At the time of programming mode, if user not touch any key for some time then system automatically Exist programming mode.
Auto/manual mode
By press shift key delay led blinking, it means system in manual mode now user can be change tap position by use up key for increase and set key for decrease, If again press shift key now system in auto mode.
By press shift key delay led blinking, it means system in manual mode now user can be change tap position by use up key for increase and set key for decrease, If again press shift key now system in auto mode.
Use keys in manual mode
Shift key : Auto/manual
Set key : Decrement key
Up key : increment key
Shift key : Auto/manual
Set key : Decrement key
Up key : increment key
Rs 485,Modbus Communication :
Baud Rate: 9600 bps
Data bit : 8 Bit
Stop bit : 1
Parity : None
All data in hex format
Format: ([ID][03][adress h][adress low][00][01][84= crc low][0A= crc H]
Sending Format: ([ID][03][Data h][data low][Data_h][Data_lo][84= crc low][0A= crc H]
Baud Rate: 9600 bps
Data bit : 8 Bit
Stop bit : 1
Parity : None
All data in hex format
Format: ([ID][03][adress h][adress low][00][01][84= crc low][0A= crc H]
Sending Format: ([ID][03][Data h][data low][Data_h][Data_lo][84= crc low][0A= crc H]
Address :
;40001= PT voltage
;40002= Tap position
;40003= Vset high
;40004= Vset low
;40005= tap change counter (tota lizer
;40001= PT voltage
;40002= Tap position
;40003= Vset high
;40004= Vset low
;40005= tap change counter (tota lizer
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Brand name : Narendra Electronics & Technology
