PRODUCT SHOW
SAI-3381D
I. Overview
For 35KV and below voltage in series and parallel wiring dry or oil-immersed reactors supply side or the load side protection and monitoring . For reactors wired in series , the opposite should configure a SAI-318D line protection and control devices .
Protection configuration
● reaction fault protection zone differential protection
● Failure by the reaction of the protected area ratio of the second harmonic restraint differential protection
● CT disconnection detection and differential protection lockout
● non-power protection
● Two-stage definite -time overcurrent protection
● Overload protection ( optional trip or alarm signals )
● zero sequence overcurrent protection ( trip or alarm signals optional )
● voltage protection
● small current grounding line selection function
● fault filtering, event SOE, independent of the operating circuit
Control Function Deployment
● 11 road open into the strong electric remote signal acquisition
● device power failure alarm , emergency signal device , the device alarm signal
● breaker remote control division , division and frequency statistics
● analog telemetry : Ia, Ib ( optional , must specify when ordering ), Ic, Ua, Ub, Uc, P, Q, COSθ, F
● power metering
● 2 -way pulse input
● 1 -way GPS time
Second, the principle of protection
2.1 Instantaneous differential element
When the current is greater than either move away from the differential speed off the setting value , the total exports of the relay action . Used under severe fault zone in the case of the differential reactor rapid removal reactor. Should be able to determine the value of the differential speed to escape the maximum external fault current imbalance and airdrop reactor when the inrush current , taking into account current transformer saturation factor , generally take 6 to 12 times the rated current.
Its operating conditions are as follows :
Which is a differential current Id , Isd to determine the value of the differential speed
2.2 ratio differential element
Conventional rate differential principle , its movement equation is as follows :
Id> Icd (Ir Iro)
Id - Icd> Kcd • (Ir-Iro) (Ir ≥ Iro)
At the same time satisfy the above two equations , the ratio differential element . Where , Id is a differential current , Ir brake current , Kcd as the ratio of braking coefficient , Icd for the differential current threshold value , Iro current value for the inflection point .
Its action curve as shown below:
Recommended that the elements of the current Iro inflection point is set at 1.0 times the rated current of the high-pressure side to guarantee inter-turn short circuit current is less than the rated current of the brake that Ir Ie, no braking action .
Differential current threshold criterion should not be too small , it is recommended to take Icd = (0.3 ~ 0.5) Ie.
Setting according to the following formula braking coefficient ratios were :
Kcd = Kk • (Ktx • Fwc + △ U + △ Fph)
Which , Kk reliable coefficient, 1.3 to 1.5
Ktx for the same type of factor, taking 1.0
Fwc permissible current transformer error of 0.1
Half of error △ U reactor caused the regulator tap , take pressure range of
△ Fphph the relative error caused by a current transformer current imbalance , take 0.05
Braking coefficient Kcd recommended ratio ranges from 0.3 to 0.7.
For dual ring becomes :
Where were the high side and low side current, are flowing into the reactor as a positive direction.
2.3, CT disconnection alarm and lockout
CT has a broken latch or momentary alarm functions and differential current limit alarm function.
2.3.1 , the instantaneous disconnection CT
After starting rate differential , subject to instantaneous disconnection CT testing to ensure the flow is not due to poor break caused . CT is determined after the break , an alarm signal , reporting CT disconnection, by adjusting the control word can decide whether locking differential protection .
CT instantaneous disconnection determined in any of the following conditions is satisfied , the determination is not performed CT disconnection :
1 ) Before starting a side maximum phase current is less than 20% of the rated current side is not sentenced to the side ;
2) After starting phase current is greater than the maximum of 120% of rated current side ;
3 ) Start served as a side current increase over the previous start.
In the case of the above three conditions are not met, such as one side of the following conditions are satisfied , the penalty for CT disconnection :
4 ) is only one phase current is zero ;
5 ) The remaining two-phase currents are equal before the starting current.
2.3.2 , differential current limit alarm
If the difference is greater than the flow of high-pressure side of the rated current 15 percent , by determining the over 10s, an alarm signal. And reports differential current -limit , but not locking differential protection . This feature and the protective device AC sampling monitoring circuit.
2.4 overcurrent
Real-time computing device and overcurrent discrimination Sec . Sec apparatus when performing an overcurrent determination , the logical consistency determination section , the operating conditions were as follows:
1) In> Idn; Idn: N segments overcurrent setpoint
2) T> T0n; T0n: N segment delay overcurrent setpoint
2.5 Overload protection
Overload device monitors three-phase current, the operating conditions are:
MAX (I )> Ifh
Time delay to
Which Ifh to overload current value . Overload alarm and trip choices selected by the control word.
2.5 voltage protection
In order to protect the bus after the loss of pressure coincides success reactors from impact damage settings. Voltage protection by Tab atresia.
2.6 Zero sequence overcurrent protection
This device specifically set a time limit of zero sequence overcurrent protection can be controlled via soft cast back plate .
2.7 Data Record
Function with SAI-318D.
2.8 remote telemetry , remote control
Function with SAI-318D.
Third, the setting and the pressure plate
3.1 List and description of the setting value
No. Name value reference range Unit Remarks
A control word of a 0000 ~ FFFF no see control word description
2 control word二0000 ~ FFFF no spare
3 high-pressure side of the rated current 0.2 ~ 15.0 A
4 low side rated current 0.2 ~ 15.0 A
5 quick-break action current 0.02 ~ 99.99 A
6 Differential Ipickup 0.02 ~ 40 A
7 percentage differential current 0.0 ~ 15.0 A turning point
8 differential braking coefficient ratio of 0.2 to 1.00 without
9 Current section Ⅰ 0.2 ~ 100.0 A
10 Current section Ⅰ time 0.0 ~ 20.0 S
11 Current section Ⅱ 0.2 ~ 100.0 A
12 Current Ⅱ period of time 0.0 ~ 20.0 S
13 Overload current 0.2 ~ 100.0 A
14 overload time 0.0 ~ 20.0 S
15 zero-sequence overcurrent settings 0.2 ~ 100.0 A
16 zero- sequence overcurrent time 0.0 ~ 20.0 S
17 under voltage setpoint 10 ~ 120.0 A
18 undervoltage time 0.0 ~ 20.0 S
19 undervoltage lockout Current 0.2 ~ 100.0 A
20 measuring CT ratio of 0.01 to 5.0 without first measuring CT ratio / 1000
21 measuring PT ratio of 0.01 to 5.0 without a PT ratio / 1000
Control word a definition:
Bit is set to 1 meaning set of meanings 0:00
15 PT disconnection alarm inputs PT disconnection alarm exit
14 CT rated current 1A CT rated current 5A
13 Control loop break into the control loop break discriminating judgment exit
12 non-power non-power cast vote tripped alarms
11 second harmonic restraint into the second harmonic restraint exit
10 Poor poor flow into streams cross the line cross the line alarm alarm exit
2 to 9 Reserved Reserved
1 CT CT disconnection does not break blocking protection lockout protection
0 overload tripping overload alarm
3.2 List and description of the soft plate
Corresponding function name plate
Differential differential protection feature cast back
Differential ratio differential protection cast back
Overcurrent stage Ⅰ Ⅰ current segment protection cast back
Current section Ⅱ Ⅱ overcurrent protection cast back section
Zero sequence overcurrent zero sequence overcurrent protection cast back
Overload Overload protection cast back
Undervoltage protection under voltage protection features cast back
Spare backup protection cast back
Spare backup protection cast back
Spare backup protection cast back
Spare backup protection cast back
For 35KV and below voltage in series and parallel wiring dry or oil-immersed reactors supply side or the load side protection and monitoring . For reactors wired in series , the opposite should configure a SAI-318D line protection and control devices .
Protection configuration
● reaction fault protection zone differential protection
● Failure by the reaction of the protected area ratio of the second harmonic restraint differential protection
● CT disconnection detection and differential protection lockout
● non-power protection
● Two-stage definite -time overcurrent protection
● Overload protection ( optional trip or alarm signals )
● zero sequence overcurrent protection ( trip or alarm signals optional )
● voltage protection
● small current grounding line selection function
● fault filtering, event SOE, independent of the operating circuit
Control Function Deployment
● 11 road open into the strong electric remote signal acquisition
● device power failure alarm , emergency signal device , the device alarm signal
● breaker remote control division , division and frequency statistics
● analog telemetry : Ia, Ib ( optional , must specify when ordering ), Ic, Ua, Ub, Uc, P, Q, COSθ, F
● power metering
● 2 -way pulse input
● 1 -way GPS time
Second, the principle of protection
2.1 Instantaneous differential element
When the current is greater than either move away from the differential speed off the setting value , the total exports of the relay action . Used under severe fault zone in the case of the differential reactor rapid removal reactor. Should be able to determine the value of the differential speed to escape the maximum external fault current imbalance and airdrop reactor when the inrush current , taking into account current transformer saturation factor , generally take 6 to 12 times the rated current.
Its operating conditions are as follows :
Which is a differential current Id , Isd to determine the value of the differential speed
2.2 ratio differential element
Conventional rate differential principle , its movement equation is as follows :
Id> Icd (Ir Iro)
Id - Icd> Kcd • (Ir-Iro) (Ir ≥ Iro)
At the same time satisfy the above two equations , the ratio differential element . Where , Id is a differential current , Ir brake current , Kcd as the ratio of braking coefficient , Icd for the differential current threshold value , Iro current value for the inflection point .
Its action curve as shown below:
Recommended that the elements of the current Iro inflection point is set at 1.0 times the rated current of the high-pressure side to guarantee inter-turn short circuit current is less than the rated current of the brake that Ir Ie, no braking action .
Differential current threshold criterion should not be too small , it is recommended to take Icd = (0.3 ~ 0.5) Ie.
Setting according to the following formula braking coefficient ratios were :
Kcd = Kk • (Ktx • Fwc + △ U + △ Fph)
Which , Kk reliable coefficient, 1.3 to 1.5
Ktx for the same type of factor, taking 1.0
Fwc permissible current transformer error of 0.1
Half of error △ U reactor caused the regulator tap , take pressure range of
△ Fphph the relative error caused by a current transformer current imbalance , take 0.05
Braking coefficient Kcd recommended ratio ranges from 0.3 to 0.7.
For dual ring becomes :
Where were the high side and low side current, are flowing into the reactor as a positive direction.
2.3, CT disconnection alarm and lockout
CT has a broken latch or momentary alarm functions and differential current limit alarm function.
2.3.1 , the instantaneous disconnection CT
After starting rate differential , subject to instantaneous disconnection CT testing to ensure the flow is not due to poor break caused . CT is determined after the break , an alarm signal , reporting CT disconnection, by adjusting the control word can decide whether locking differential protection .
CT instantaneous disconnection determined in any of the following conditions is satisfied , the determination is not performed CT disconnection :
1 ) Before starting a side maximum phase current is less than 20% of the rated current side is not sentenced to the side ;
2) After starting phase current is greater than the maximum of 120% of rated current side ;
3 ) Start served as a side current increase over the previous start.
In the case of the above three conditions are not met, such as one side of the following conditions are satisfied , the penalty for CT disconnection :
4 ) is only one phase current is zero ;
5 ) The remaining two-phase currents are equal before the starting current.
2.3.2 , differential current limit alarm
If the difference is greater than the flow of high-pressure side of the rated current 15 percent , by determining the over 10s, an alarm signal. And reports differential current -limit , but not locking differential protection . This feature and the protective device AC sampling monitoring circuit.
2.4 overcurrent
Real-time computing device and overcurrent discrimination Sec . Sec apparatus when performing an overcurrent determination , the logical consistency determination section , the operating conditions were as follows:
1) In> Idn; Idn: N segments overcurrent setpoint
2) T> T0n; T0n: N segment delay overcurrent setpoint
2.5 Overload protection
Overload device monitors three-phase current, the operating conditions are:
MAX (I )> Ifh
Time delay to
Which Ifh to overload current value . Overload alarm and trip choices selected by the control word.
2.5 voltage protection
In order to protect the bus after the loss of pressure coincides success reactors from impact damage settings. Voltage protection by Tab atresia.
2.6 Zero sequence overcurrent protection
This device specifically set a time limit of zero sequence overcurrent protection can be controlled via soft cast back plate .
2.7 Data Record
Function with SAI-318D.
2.8 remote telemetry , remote control
Function with SAI-318D.
Third, the setting and the pressure plate
3.1 List and description of the setting value
No. Name value reference range Unit Remarks
A control word of a 0000 ~ FFFF no see control word description
2 control word二0000 ~ FFFF no spare
3 high-pressure side of the rated current 0.2 ~ 15.0 A
4 low side rated current 0.2 ~ 15.0 A
5 quick-break action current 0.02 ~ 99.99 A
6 Differential Ipickup 0.02 ~ 40 A
7 percentage differential current 0.0 ~ 15.0 A turning point
8 differential braking coefficient ratio of 0.2 to 1.00 without
9 Current section Ⅰ 0.2 ~ 100.0 A
10 Current section Ⅰ time 0.0 ~ 20.0 S
11 Current section Ⅱ 0.2 ~ 100.0 A
12 Current Ⅱ period of time 0.0 ~ 20.0 S
13 Overload current 0.2 ~ 100.0 A
14 overload time 0.0 ~ 20.0 S
15 zero-sequence overcurrent settings 0.2 ~ 100.0 A
16 zero- sequence overcurrent time 0.0 ~ 20.0 S
17 under voltage setpoint 10 ~ 120.0 A
18 undervoltage time 0.0 ~ 20.0 S
19 undervoltage lockout Current 0.2 ~ 100.0 A
20 measuring CT ratio of 0.01 to 5.0 without first measuring CT ratio / 1000
21 measuring PT ratio of 0.01 to 5.0 without a PT ratio / 1000
Control word a definition:
Bit is set to 1 meaning set of meanings 0:00
15 PT disconnection alarm inputs PT disconnection alarm exit
14 CT rated current 1A CT rated current 5A
13 Control loop break into the control loop break discriminating judgment exit
12 non-power non-power cast vote tripped alarms
11 second harmonic restraint into the second harmonic restraint exit
10 Poor poor flow into streams cross the line cross the line alarm alarm exit
2 to 9 Reserved Reserved
1 CT CT disconnection does not break blocking protection lockout protection
0 overload tripping overload alarm
3.2 List and description of the soft plate
Corresponding function name plate
Differential differential protection feature cast back
Differential ratio differential protection cast back
Overcurrent stage Ⅰ Ⅰ current segment protection cast back
Current section Ⅱ Ⅱ overcurrent protection cast back section
Zero sequence overcurrent zero sequence overcurrent protection cast back
Overload Overload protection cast back
Undervoltage protection under voltage protection features cast back
Spare backup protection cast back
Spare backup protection cast back
Spare backup protection cast back
Spare backup protection cast back
