CN106908649A - Generator power pick-up device voltage sample system and method - Google Patents
Generator power pick-up device voltage sample system and method Download PDFInfo
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Abstract
Present invention is disclosed a kind of generator power pick-up device voltage sample system and method, generator power pick-up device is provided with two voltage sample passages, it is respectively connected to two generators machine potential transformer TV1, TV2, voltage respectively first voltage amount UTV1 and second voltage amount UTV2 that two voltage sample passages are adopted；This two groups of voltages simultaneously sample, by setting logic carry out TV broken string judge, and complete from switching from faulty channel to normal channel.Generator power pick-up device voltage sample system and method proposed by the present invention, it can be ensured that when voltage sample passage breaks down, automatically switches to the second road sampling channel and continues to run with, it is ensured that voltage sample reliability.The present invention brings generator active power pick-up device cisco unity malfunction, and then the generator power exception fluctuation for causing when can prevent one group of TV from breaking.
Description
Technical field
The invention belongs to technical field of generators, it is related to a kind of generator power pick-up device, more particularly to a kind of generating
Acc power pick-up device voltage sample system；Meanwhile, the invention further relates to a kind of generator power pick-up device voltage sample side
Method.
Background technology
As Automation of Electric Systems degree is increasingly improved, power plant's Power auto-adjustment remote auto frequency modulation becomes basically universal.
But when generator generator terminal TV occurs broken string or other loops are abnormal, the power regulating system of generator follows action, often sends out
Raw power toning mistuning, triggers generator power fluctuation, or even unit to cut machine.
It is sampling front-end generally generator or transformer unit the outlet power change of generator power regulating system to trace it to its cause
Device is sent, in generator generator terminal TV broken strings or abnormal TV loops, power samples will return the power output for voltage sample distortion
Unreliable, this results in power transducer power output serious distortion.And then cause associated automatic regulating system not just
Often work, causes generator power exception fluctuation, or even generating set zero energy can be caused to cut machine protection act and cut machine by mistake.
In light of this situation, it is necessary to for a kind of more scientific rational voltage sample mode of power pick-up device research,
So as to the drawbacks described above for overcoming existing mode to exist.
The content of the invention
The technical problems to be solved by the invention are：A kind of generator power pick-up device voltage sample system is provided, can
Ensure, when voltage sample passage breaks down, to automatically switch to the second road sampling channel, it is ensured that voltage sample reliability.
Additionally, the present invention also provides a kind of generator power pick-up device voltage sampling method, it can be ensured that in voltage sample
When passage breaks down, the second road sampling channel is automatically switched to, it is ensured that voltage sample reliability.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
A kind of generator power pick-up device voltage sample system, generator power pick-up device is provided with two voltage samples
Passage, is respectively connected to two generators machine potential transformer：First group of voltage transformer TV1, second group of voltage transformer
TV2, voltage respectively first voltage amount UTV1 and second voltage amount UTV2 that two voltage sample passages are adopted；This two groups electricity
Pressure amount simultaneously sample, by setting logic carry out TV broken string judge, and complete from switching from faulty channel to normal channel；
The system includes：First voltage sampling channel, second voltage sampling channel, TV broken strings determination module, switching mould
Block, TV broken string determination modules connect first voltage sampling channel, second voltage sampling channel, handover module respectively；
The first voltage sampling channel is used to gather the corresponding line voltage UTV1 of TV1；
The second voltage sampling channel is used to gather the corresponding line voltage UTV2 of TV2；
The TV broken strings determination module is used to determine a need for switching into row of channels；
First voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1) second voltage sampling
Passage adopts TV2 line voltages UTV2 and first voltage sampling channel, and to adopt the corresponding line voltage UTV1 of TV1 poor more than setting value USET2；
(2) second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and adopts TV1 positive sequence voltages U1_ with first voltage sampling channel
The difference of TV1 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV1 of first voltage sampling channel access is judged to
Loop exception；The handover module is used to when the TV1 loops that first voltage sampling channel is accessed are abnormal, by power calculation power taking
Pressure value is switched to TV2 by TV1；
Second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1) first voltage sampling
Passage adopts TV1 line voltages UTV1 and second voltage sampling channel, and to adopt the corresponding line voltage UTV2 of TV2 poor more than setting value USET2；
(2) first voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and adopts TV2 positive sequence voltages U1_ with second voltage sampling channel
The difference of TV2 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV2 of second voltage sampling channel access is judged to
Loop exception；The handover module is used to when the TV2 loops that second voltage sampling channel is accessed are abnormal, by power calculation power taking
Pressure value is switched to TV2 by TV1.
As a preferred embodiment of the present invention, USET2Take 1~5V.
As a preferred embodiment of the present invention, USET1Take 1~3V.
Used as a preferred embodiment of the present invention, the generator power pick-up device is filled for generator active power pick-up
Put.
A kind of generator power pick-up device voltage sample system, generator power pick-up device is provided with two voltage samples
Passage, is respectively connected to two generators machine potential transformer TV1, TV2, the voltage difference that two voltage sample passages are adopted
It is first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, and carrying out TV broken strings by setting logic sentences
It is fixed, and complete from switching from faulty channel to normal channel.
Used as a preferred embodiment of the present invention, the system includes：First voltage sampling channel, second voltage sampling are logical
Road, TV broken strings determination module, handover module, TV broken string determination modules connect first voltage sampling channel, second voltage and adopt respectively
Sample passage, handover module；
The first voltage sampling channel is used to gather the corresponding line voltage UTV1 of TV1；
The second voltage sampling channel is used to gather the corresponding line voltage UTV2 of TV2；
The TV broken strings determination module is used to determine a need for switching into row of channels；
The handover module is used to when the TV1 loops that first voltage sampling channel is accessed are abnormal, by power calculation power taking
Pressure value is switched to TV2 by TV1；When the TV2 loops that second voltage sampling channel is accessed are abnormal, by power calculation take magnitude of voltage by
TV1 is switched to TV2.
Used as a preferred embodiment of the present invention, first voltage sampling channel is to second voltage sampling channel switching condition
Meet simultaneously：(1) second voltage sampling channel adopts TV2 line voltages UTV2 and first voltage sampling channel and adopts the corresponding lines of TV1
Voltage UTV1 differences are more than setting value USET2；(2) second voltage sampling channel is adopted TV2 positive sequence voltages U1_TV2 and is adopted with first voltage
The difference that sample passage adopts TV1 positive sequence voltages U1_TV1 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, is judged to
The TV1 loops exception that one voltage sample passage is accessed.
Used as a preferred embodiment of the present invention, second voltage sampling channel is to first voltage sampling channel switching condition
Meet simultaneously：(1) first voltage sampling channel adopts TV1 line voltages UTV1 and second voltage sampling channel and adopts the corresponding lines of TV2
Voltage UTV2 differences are more than setting value USET2；(2) first voltage sampling channel is adopted TV1 positive sequence voltages U1_TV1 and is adopted with second voltage
The difference that sample passage adopts TV2 positive sequence voltages U1_TV2 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, is judged to
The TV2 loops exception that two voltage sample passages are accessed.
A kind of generator power pick-up device voltage sampling method, generator power pick-up device is provided with two voltage samples
Passage, is respectively connected to two generators machine potential transformer：TV1, TV2, the voltage point that two voltage sample passages are adopted
Wei not first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, and TV broken strings are carried out by setting logic
Judge, and complete from switching from faulty channel to normal channel；
Methods described includes：
Step S1, the corresponding line voltage UTV1 of first voltage sampling channel collection TV1；
Step S2, the corresponding line voltage UTV2 of second voltage sampling channel collection TV2；
Step S3, TV broken string determination module determines a need for switching into row of channels；
First voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1) second voltage sampling
Passage adopts TV2 line voltages UTV2 and first voltage sampling channel, and to adopt the corresponding line voltage UTV1 of TV1 poor more than setting value USET2；
(2) second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and adopts TV1 positive sequence voltages U1_ with first voltage sampling channel
The difference of TV1 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV1 of first voltage sampling channel access is judged to
Loop exception；
Second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1) first voltage sampling
Passage adopts TV1 line voltages UTV1 and second voltage sampling channel, and to adopt the corresponding line voltage UTV2 of TV2 poor more than setting value USET2；
(2) first voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and adopts TV2 positive sequence voltages U1_ with second voltage sampling channel
The difference of TV2 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV2 of second voltage sampling channel access is judged to
Loop exception；
Step S4, handover module when TV1 loops that first voltage sampling channel is accessed are abnormal, by power calculation power taking pressure
Value is switched to TV2 by TV1；
Power calculation is taken magnitude of voltage by TV1 by handover module when the TV2 loops that second voltage sampling channel is accessed are abnormal
It is switched to TV2.
A kind of generator power pick-up device voltage sampling method, generator power pick-up device is provided with two voltage samples
Passage, is respectively connected to two generators machine potential transformer TV1, TV2, the voltage difference that two voltage sample passages are adopted
It is first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, and carrying out TV broken strings by setting logic sentences
It is fixed, and complete from switching from faulty channel to normal channel.
The beneficial effects of the present invention are：Generator power pick-up device voltage sample system proposed by the present invention and side
Method, it can be ensured that when voltage sample passage breaks down, automatically switches to the second road sampling channel and continues to run with, it is ensured that voltage is adopted
Sample reliability.The present invention brings generator active power pick-up device cisco unity malfunction when can prevent one group of TV from breaking, and then
The generator power exception fluctuation for causing.
Present system meets generator generator terminal TV still can reliably work in broken string or abnormal TV loops, be power
Automatic regulating system provides safe and reliable sampled value.
Brief description of the drawings
Fig. 1 is the composition schematic diagram of generator power transmitting system of the present invention.
Fig. 2 is the condition schematic diagram of generator terminal TV broken strings in present system.
Fig. 3 is another condition schematic diagram of generator terminal TV broken strings in present system.
In figure, G is generator, and t represents generator terminal, and n represents neutral point, and NGD is generator neutral point grounding transformer, TAp
It is protected level current transformer, TAmIt is protected level current transformer, F1, F2 are fuse, and TV is generator terminal voltage mutual inductance
Device, UA、UBAnd UCIt is generator generator terminal three-phase voltage, IpA、IpBAnd IpCIt is generator generator terminal protected level TA three-phase currents, ImA、ImB
And ImCFor generator generator terminal measures level TA three-phase currents.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
Embodiment one
Fig. 1 is referred to, present invention is disclosed a kind of generator power pick-up device voltage sample system, the generator work(
Rate pick-up device can be generator active power pick-up device.Generator power pick-up device is provided with two voltage samples and leads to
Road, is respectively connected to two generators machine potential transformer：First group of voltage transformer TV1, second group of voltage transformer TV2,
Voltage respectively first voltage amount UTV1 and second voltage amount UTV2 that two voltage sample passages are adopted；This two groups of voltages
Simultaneously sample, by setting logic carry out TV broken string judge, and complete from switching from faulty channel to normal channel；
The system includes：First voltage sampling channel, second voltage sampling channel, TV broken strings determination module, switching mould
Block, TV broken string determination modules connect first voltage sampling channel, second voltage sampling channel, handover module respectively；
The first voltage sampling channel is used to gather the corresponding line voltage UTV1 of TV1；
The second voltage sampling channel is used to gather the corresponding line voltage UTV2 of TV2；
The TV broken strings determination module is used to determine a need for switching into row of channels；
Fig. 2 is referred to, first voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1)
Two voltage sample passages adopt TV2 line voltages UTV2 and first voltage sampling channel and adopt that the corresponding line voltage UTV1 of TV1 are poor to be more than
Setting value USET2, USET2Typically take 1~5V；(2) second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and first voltage
The difference that sampling channel adopts TV1 positive sequence voltages U1_TV1 is more than setting value USET1, USET1Typically take 1~3V；If meet above-mentioned simultaneously
Two conditions, then be judged to the TV1 loops exception of first voltage sampling channel access；The handover module is used to be adopted in first voltage
When the TV1 loops that sample passage is accessed are abnormal, power calculation taken into magnitude of voltage TV2 is switched to by TV1；
Fig. 3 is referred to, second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1)
One voltage sample passage adopts TV1 line voltages UTV1 and second voltage sampling channel and adopts that the corresponding line voltage UTV2 of TV2 are poor to be more than
Setting value USET2, USET2Typically take 1~5V；(2) first voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and second voltage
The difference that sampling channel adopts TV2 positive sequence voltages U1_TV2 is more than setting value USET1, USET1Typically take 1~3V；If meet above-mentioned simultaneously
Two conditions, then be judged to the TV2 loops exception of second voltage sampling channel access；The handover module is used to be adopted in second voltage
When the TV2 loops that sample passage is accessed are abnormal, power calculation taken into magnitude of voltage TV2 is switched to by TV1.
The present invention also discloses a kind of generator power pick-up device voltage sampling method, and generator power pick-up device is provided with
Two voltage sample passages, are respectively connected to two generators machine potential transformer：TV1, TV2, two voltage sample passages are adopted
The voltage for obtaining is respectively first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, are patrolled by setting
TV broken strings volume are carried out to judge, and complete from switching from faulty channel to normal channel；
Methods described includes：
Step S1, the corresponding line voltage UTV1 of first voltage sampling channel collection TV1；
Step S2, the corresponding line voltage UTV2 of second voltage sampling channel collection TV2；
Step S3, TV broken string determination module determines a need for switching into row of channels；
First voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1) second voltage sampling
Passage adopts TV2 line voltages UTV2 and first voltage sampling channel, and to adopt the corresponding line voltage UTV1 of TV1 poor more than setting value USET2；
(2) second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and adopts TV1 positive sequence voltages U1_ with first voltage sampling channel
The difference of TV1 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV1 of first voltage sampling channel access is judged to
Loop exception；
Second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1) first voltage sampling
Passage adopts TV1 line voltages UTV1 and second voltage sampling channel, and to adopt the corresponding line voltage UTV2 of TV2 poor more than setting value USET2；
(2) first voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and adopts TV2 positive sequence voltages U1_ with second voltage sampling channel
The difference of TV2 is more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV2 of second voltage sampling channel access is judged to
Loop exception；
Step S4, handover module when TV1 loops that first voltage sampling channel is accessed are abnormal, by power calculation power taking pressure
Value is switched to TV2 by TV1；
Power calculation is taken magnitude of voltage by TV1 by handover module when the TV2 loops that second voltage sampling channel is accessed are abnormal
It is switched to TV2.
Embodiment two
A kind of generator power pick-up device voltage sample system, generator power pick-up device is provided with two voltage samples
Passage, is respectively connected to two generators machine potential transformer TV1, TV2, the voltage difference that two voltage sample passages are adopted
It is first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, and carrying out TV broken strings by setting logic sentences
It is fixed, and complete from switching from faulty channel to normal channel.
A kind of generator power pick-up device voltage sampling method, generator power pick-up device is provided with two voltage samples
Passage, is respectively connected to two generators machine potential transformer TV1, TV2, the voltage difference that two voltage sample passages are adopted
It is first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, and carrying out TV broken strings by setting logic sentences
It is fixed, and complete from switching from faulty channel to normal channel.
In sum, generator power pick-up device voltage sample system and method proposed by the present invention, it can be ensured that in electricity
When pressure sampling channel breaks down, automatically switch to the second road sampling channel and continue to run with, it is ensured that voltage sample reliability.This hair
It is bright to prevent from bringing generator active power pick-up device cisco unity malfunction, and then the generator work(for causing during one group of TV broken string
Rate exception fluctuation.
Here description of the invention and application are illustrative, are not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for those skilled in the art
The replacement and equivalent various parts for applying example are known.It should be appreciated by the person skilled in the art that not departing from the present invention
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio, and with other components,
Material and part are realized.In the case where scope and spirit of the present invention are not departed from, embodiments disclosed herein can be entered
Other deformations of row and change.
Claims (10)
1. a kind of generator power pick-up device voltage sample system, it is characterised in that generator power pick-up device is provided with two
Individual voltage sample passage, is respectively connected to two generators machine potential transformer：First group of voltage transformer TV1, second group of electricity
Pressure transformer TV2, voltage respectively first voltage amount UTV1 and second voltage amount UTV2 that two voltage sample passages are adopted；
This two groups of voltages are sampled simultaneously, and carrying out TV broken strings by setting logic judges, and completes from faulty channel cutting to normal channel
Change；
The system includes：First voltage sampling channel, second voltage sampling channel, TV broken strings determination module, handover module, TV
Broken string determination module connects first voltage sampling channel, second voltage sampling channel, handover module respectively；
The first voltage sampling channel is used to gather the corresponding line voltage UTV1 of first group of voltage transformer TV1；
The second voltage sampling channel is used to gather the corresponding line voltage UTV2 of second group of voltage transformer TV2；
The TV broken strings determination module is used to determine a need for switching into row of channels；
First voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1) second voltage sampling channel
Adopting TV2 line voltages UTV2 and first voltage sampling channel, to adopt the corresponding line voltage UTV1 of TV1 poor more than setting value USET2；(2)
Second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and adopts TV1 positive sequence voltages U1_TV1 with first voltage sampling channel
Difference be more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV1 loops of first voltage sampling channel access are judged to
It is abnormal；The handover module is used to, when the TV1 loops that first voltage sampling channel is accessed are abnormal, power calculation be taken into magnitude of voltage
TV2 is switched to by TV1；
Second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1) first voltage sampling channel
Adopting TV1 line voltages UTV1 and second voltage sampling channel, to adopt the corresponding line voltage UTV2 of TV2 poor more than setting value USET2；(2)
First voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and adopts TV2 positive sequence voltages U1_TV2 with second voltage sampling channel
Difference be more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV2 loops of second voltage sampling channel access are judged to
It is abnormal；The handover module is used to, when the TV2 loops that second voltage sampling channel is accessed are abnormal, power calculation be taken into magnitude of voltage
TV2 is switched to by TV1.
2. generator power pick-up device voltage sample system according to claim 1, it is characterised in that：
USET2Take 1~5V.
3. generator power pick-up device voltage sample system according to claim 1, it is characterised in that：
USET1Take 1~3V.
4. generator power pick-up device voltage sample system according to claim 1, it is characterised in that：
The generator power pick-up device is generator active power pick-up device.
5. a kind of generator power pick-up device voltage sample system, it is characterised in that generator power pick-up device is provided with two
Individual voltage sample passage, is respectively connected to two generators machine potential transformer TV1, TV2, what two voltage sample passages were adopted
Voltage is respectively first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, are entered by setting logic
Row TV broken string judge, and complete from switching from faulty channel to normal channel.
6. generator power pick-up device voltage sample system according to claim 5, it is characterised in that：
The system includes：First voltage sampling channel, second voltage sampling channel, TV broken strings determination module, handover module, TV
Broken string determination module connects first voltage sampling channel, second voltage sampling channel, handover module respectively；
The first voltage sampling channel is used to gather the corresponding line voltage UTV1 of TV1；
The second voltage sampling channel is used to gather the corresponding line voltage UTV2 of TV2；
The TV broken strings determination module is used to determine a need for switching into row of channels；
The handover module is used to, when the TV1 loops that first voltage sampling channel is accessed are abnormal, power calculation be taken into magnitude of voltage
TV2 is switched to by TV1；When the TV2 loops that second voltage sampling channel is accessed are abnormal, power calculation is taken into magnitude of voltage by TV1
It is switched to TV2.
7. generator power pick-up device voltage sample system according to claim 6, it is characterised in that：
First voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1) second voltage sampling channel
Adopting TV2 line voltages UTV2 and first voltage sampling channel, to adopt the corresponding line voltage UTV1 of TV1 poor more than setting value USET2；(2)
Second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and adopts TV1 positive sequence voltages U1_TV1 with first voltage sampling channel
Difference be more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV1 loops of first voltage sampling channel access are judged to
It is abnormal.
8. generator power pick-up device voltage sample system according to claim 6, it is characterised in that：
Second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1) first voltage sampling channel
Adopting TV1 line voltages UTV1 and second voltage sampling channel, to adopt the corresponding line voltage UTV2 of TV2 poor more than setting value USET2；(2)
First voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and adopts TV2 positive sequence voltages U1_TV2 with second voltage sampling channel
Difference be more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV2 loops of second voltage sampling channel access are judged to
It is abnormal.
9. a kind of generator power pick-up device voltage sampling method, it is characterised in that generator power pick-up device is provided with two
Individual voltage sample passage, is respectively connected to two generators machine potential transformer：TV1, TV2, two voltage sample passages are adopted
Voltage be respectively first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, by setting logic
Carry out TV broken string judge, and complete from switching from faulty channel to normal channel；
Methods described includes：
Step S1, the corresponding line voltage UTV1 of first voltage sampling channel collection TV1；
Step S2, the corresponding line voltage UTV2 of second voltage sampling channel collection TV2；
Step S3, TV broken string determination module determines a need for switching into row of channels；
First voltage sampling channel is to second voltage sampling channel switching condition for while meeting：(1) second voltage sampling channel
Adopting TV2 line voltages UTV2 and first voltage sampling channel, to adopt the corresponding line voltage UTV1 of TV1 poor more than setting value USET2；(2)
Second voltage sampling channel adopts TV2 positive sequence voltages U1_TV2 and adopts TV1 positive sequence voltages U1_TV1 with first voltage sampling channel
Difference be more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV1 loops of first voltage sampling channel access are judged to
It is abnormal；
Second voltage sampling channel is to first voltage sampling channel switching condition for while meeting：(1) first voltage sampling channel
Adopting TV1 line voltages UTV1 and second voltage sampling channel, to adopt the corresponding line voltage UTV2 of TV2 poor more than setting value USET2；(2)
First voltage sampling channel adopts TV1 positive sequence voltages U1_TV1 and adopts TV2 positive sequence voltages U1_TV2 with second voltage sampling channel
Difference be more than setting value USET1；If meeting above-mentioned two condition simultaneously, the TV2 loops of second voltage sampling channel access are judged to
It is abnormal；
Step S4, handover module when TV1 loops that first voltage sampling channel is accessed are abnormal, by power calculation take magnitude of voltage by
TV1 is switched to TV2；
Handover module takes magnitude of voltage and is switched by TV1 when the TV2 loops that second voltage sampling channel is accessed are abnormal, by power calculation
To TV2.
10. a kind of generator power pick-up device voltage sampling method, it is characterised in that generator power pick-up device is provided with two
Individual voltage sample passage, is respectively connected to two generators machine potential transformer TV1, TV2, what two voltage sample passages were adopted
Voltage is respectively first voltage amount UTV1 and second voltage amount UTV2；This two groups of voltages are sampled simultaneously, are entered by setting logic
Row TV broken string judge, and complete from switching from faulty channel to normal channel.
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| CN101651329A (en) * | 2008-12-03 | 2010-02-17 | 南京南瑞继保电气有限公司 | Judgment method of line breakage of special TV for inter-turn protection of generator |
| CN104035001A (en) * | 2014-06-25 | 2014-09-10 | 国家电网公司 | Detection method for disconnection of voltage transformers |
| CN104777397A (en) * | 2015-04-16 | 2015-07-15 | 王金泽 | Distribution line single-phase break line judgment and positioning method based on line voltage vector criterion |
| CN105119256A (en) * | 2015-10-10 | 2015-12-02 | 江苏省电力公司苏州供电公司 | Method for preventing power grid distance protection misoperation under condition of voltage loss after start |
| CN105811368A (en) * | 2016-04-18 | 2016-07-27 | 广东电网有限责任公司佛山供电局 | Self-adaptive zero line broken protection device and system |
| CN106226593A (en) * | 2016-08-31 | 2016-12-14 | 江苏大唐国际吕四港发电有限责任公司 | Generator active power intelligent transfer device |
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Application publication date: 20170630 |