CN106771812B - A kind of transformer current transformer disconnection recognition methods and device - Google Patents
A kind of transformer current transformer disconnection recognition methods and device Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention relates to a kind of transformer current transformer disconnection recognition methods and device, broken string recognition methods therein includes: the entry condition for judging whether to meet current transformer circuit supervision fail differentiation；If meeting entry condition, judge whether to meet broken string criterion；If meeting all broken string criterions, this side current transformer circuit supervision fail of transformer is determined.Whether the present invention can accurately determine whether transformer side current transformer breaks by combining electric current criterion and voltage criterion, act for transformer differential protection and provide foundation.
Description
Technical field
The present invention relates to a kind of transformer current transformer disconnection recognition methods and devices, belong to relay protection of power system
Technical field.
Background technique
" electrical safe working order " regulation, the secondary loop of mutual inductor of electrification are forbidden to open a way when working.Large-sized unit
And the current transformer that extra-high tension unit uses, secondary winding the number of turns is more, and open-circuit voltage is very high.Higher secondary voltage not only may be used
The insulation of secondary winding and secondary device can be made to be damaged, and iron core can be made to burn because of overheat, or even threaten person peace
Entirely.
In addition, when transformer current transformer disconnection occurs, will appear in circuit larger for transformer differential protection
Material unaccounted for stream, cause differential protection malfunction.Therefore, accurately identify whether transformer current mutual inductor breaks, it can be with
Foundation is provided for whether transformer differential protection acts.
Summary of the invention
The object of the present invention is to provide a kind of transformer current transformer disconnection recognition methods and devices, accurate for solving
The problem of whether transformer current mutual inductor breaks judged.
In order to solve the above technical problems, the present invention provides a kind of transformer current transformer disconnection recognition methods, including
Following scheme:
Method scheme one: include the following steps
Step 1, judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
Step 2, if meeting the entry condition, following broken string criterion is judged, the broken string differentiates item
Part are as follows:
(1) broken string differentiates that this side three-phase phase current of the preceding transformer of starting is not zero, and broken string differentiates transformer sheet after starting
Side three-phase phase current does not increase；
(2) other side three-phase phase currents of transformer do not change when broken string differentiates starting, including difference of phase currents, zero
Sequence electric current and negative-sequence current；
(3) this side of transformer and other side three-phase phase voltages do not change when broken string differentiates starting, including phase voltage is prominent
Variable, residual voltage and residual voltage Sudden Changing Rate；
Step 3, if meeting above-mentioned all broken string criterions, determine this side current transformer circuit supervision fail of transformer.
Method scheme two: on the basis of method scheme one, the trip bar of the differentiation of current transformer circuit supervision fail described in step 1
Part are as follows:
IΦ1(t-nT)-IΦ1(t) > ISET1
Wherein, n is a positive integer, several cycles before this current cycle of side three-phase phase current of indication transformer
Number, IΦ1(t) the three-phase phase current magnitude of this side of transformer, I when differentiating starting for broken stringΦ1(t-nT) starting is differentiated for broken string
When transformer this side n Zhou Boqian three-phase phase current magnitude, ISET1For this side electric current threshold value of transformer, value range is
0.06IN~0.08IN, INFor the secondary rated current of this side current transformer of transformer.
Method scheme three, four: respectively on the basis of method scheme one or two, step 2 interrupt line criterion (1) is sentenced
Other formula are as follows:
Wherein, K1For constant, value range is 1.2~1.4, IΦ1.min(t-nT) transformer sheet when differentiating starting for broken string
Minimum phase current magnitude in the three-phase current of the Zhou Boqian of side n；
The discrimination formula of broken string criterion (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of other sides of transformer, I when differentiating starting for broken stringΦ2It (t-nT) is disconnected
The three-phase phase current magnitude of transformer other sides n Zhou Boqian when line differentiates starting, | IΦ2(t)-IΦ2(t-nT) | differentiate for broken string
The three-phase of transformer other sides n Zhou Boqian when the three-phase phase current magnitude of other sides of transformer and broken string differentiate starting when starting
The absolute value of the difference of phase current magnitude, I2(t) and 3I0It (t) is respectively that broken string differentiates that the negative phase-sequence of other sides of transformer when starting is electric
Flow amplitude and zero-sequence current amplitude, ISET2For other side electric current threshold values of transformer, value range 0.08IN~0.2IN；
The discrimination formula of broken string criterion (3) are as follows:
Wherein, UΦ(t) the three-phase phase voltage amplitude of this side of transformer or other sides, U when differentiating starting for broken stringΦ(t-nT)
The three-phase phase voltage amplitude of the n Zhou Boqian of this side of transformer or other sides when differentiating starting for broken string, | UΦ(t)-UΦ(t-nT)
| this side of transformer when the three-phase phase voltage amplitude and broken string of this side of transformer or other sides differentiate starting when differentiating starting for broken string
Or the absolute value of the difference of the three-phase phase voltage amplitude of n Zhou Boqian of other sides, 3U0(t) transformation when differentiating starting for broken string
The residual voltage amplitude of this side of device or other sides, 3U0(t-nT) n of this side of transformer or other sides when differentiating starting for broken string
The residual voltage amplitude of Zhou Boqian, | 3U0(t)-3U0(t-nT) | for broken string differentiate starting when this side of transformer or other sides zero
The difference of the residual voltage amplitude of the n Zhou Boqian of this side of transformer or other sides when sequence voltage amplitude and broken string differentiate starting
Absolute value, USET1For Three-Phase Transformer phase voltage threshold value, value range 0.1UN~0.2UN, USET2For transformer zero sequence electricity
Pressure gate threshold value, value range 0.02UN~0.1UN, UNFor bis- specified phase voltages of transformer PT.
Method scheme five, six: respectively on the basis of method scheme three or four, n is equal to 2.
The present invention also provides a kind of transformer current transformer disconnection identification devices, including following scheme:
Device scheme one: including
For judging whether to meet the unit of the entry condition of current transformer circuit supervision fail differentiation；
If, to the unit that following broken string criterion is judged, the broken string is sentenced for meeting the entry condition
Other condition are as follows:
(1) broken string differentiates that this side three-phase phase current of the preceding transformer of starting is not zero, and broken string differentiates transformer sheet after starting
Side three-phase phase current does not increase；
(2) other side three-phase phase currents of transformer do not change when broken string differentiates starting, including difference of phase currents, zero
Sequence electric current and negative-sequence current；
(3) this side of transformer and other side three-phase phase voltages do not change when broken string differentiates starting, including phase voltage is prominent
Variable, residual voltage and residual voltage Sudden Changing Rate；
If determining the unit of this side current transformer circuit supervision fail of transformer for meeting above-mentioned all broken string criterions.
Device scheme two: on the basis of device scheme one, the entry condition of the current transformer circuit supervision fail differentiation are as follows:
IΦ1(t-nT)-IΦ1(t) > ISET1
Wherein, n is a positive integer, several cycles before this current cycle of side three-phase phase current of indication transformer
Number, IΦ1(t) the three-phase phase current magnitude of this side of transformer, I when differentiating starting for broken stringΦ1(t-nT) starting is differentiated for broken string
When transformer this side n Zhou Boqian three-phase phase current magnitude, ISET1For this side electric current threshold value of transformer, value range is
0.06IN~0.08IN, INFor the secondary rated current of this side current transformer of transformer.
Device scheme three, four: respectively on the basis of device scheme one or two, the discrimination formula of broken string criterion (1)
Are as follows:
Wherein, K1For constant, value range is 1.2~1.4, IΦ1.min(t-nT) transformer sheet when differentiating starting for broken string
Minimum phase current magnitude in the three-phase current of the Zhou Boqian of side n；
The discrimination formula of broken string criterion (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of other sides of transformer, I when differentiating starting for broken stringΦ2It (t-nT) is disconnected
The three-phase phase current magnitude of transformer other sides n Zhou Boqian when line differentiates starting, | IΦ2(t)-IΦ2(t-nT) | differentiate for broken string
The three-phase of transformer other sides n Zhou Boqian when the three-phase phase current magnitude of other sides of transformer and broken string differentiate starting when starting
The absolute value of the difference of phase current magnitude, I2(t) and 3I0It (t) is respectively that broken string differentiates that the negative phase-sequence of other sides of transformer when starting is electric
Flow amplitude and zero-sequence current amplitude, ISET2For other side electric current threshold values of transformer, value range 0.08IN~0.2IN；
The discrimination formula of broken string criterion (3) are as follows:
Wherein, UΦ(t) the three-phase phase voltage amplitude of this side of transformer or other sides, U when differentiating starting for broken stringΦ(t-nT)
The three-phase phase voltage amplitude of the n Zhou Boqian of this side of transformer or other sides when differentiating starting for broken string, | UΦ(t)-UΦ(t-nT)
| this side of transformer when the three-phase phase voltage amplitude and broken string of this side of transformer or other sides differentiate starting when differentiating starting for broken string
Or the absolute value of the difference of the three-phase phase voltage amplitude of n Zhou Boqian of other sides, 3U0(t) transformation when differentiating starting for broken string
The residual voltage amplitude of this side of device or other sides, 3U0(t-nT) n of this side of transformer or other sides when differentiating starting for broken string
The residual voltage amplitude of Zhou Boqian, | 3U0(t)-3U0(t-nT) | for broken string differentiate starting when this side of transformer or other sides zero
The difference of the residual voltage amplitude of the n Zhou Boqian of this side of transformer or other sides when sequence voltage amplitude and broken string differentiate starting
Absolute value, USET1For Three-Phase Transformer phase voltage threshold value, value range 0.1UN~0.2UN, USET2For transformer zero sequence electricity
Pressure gate threshold value, value range 0.02UN~0.1UN, UNFor bis- specified phase voltages of transformer PT.
Device scheme five, six: respectively on the basis of device scheme three or four, n is equal to 2.
The beneficial effects of the present invention are:
By differentiating the situation of change of this side of transformer and other side three-phase phase currents and three-phase phase voltage, can accurately sentence
Whether whether disconnected this side current transformer of transformer out breaks, act for transformer differential protection and provide foundation.
Detailed description of the invention
Fig. 1 is 220kV transformer main electrical scheme schematic diagram；
Fig. 2 is the flow chart of transformer current transformer disconnection recognition methods.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
By taking 220kV transformer as an example, main electrical scheme schematic diagram is as shown in Figure 1.High voltage side of transformer, medium voltage side when normal operation
With low-pressure side breaker closing, high voltage side current mutual inductor and voltage transformer are respectively TA1 and TV1, medium voltage side Current Mutual Inductance
Device and voltage transformer are respectively TA2 and TV2, and low-pressure side current transformer and voltage transformer are respectively TA3 and TV3.Normally
When operation, if broken string occurs by TA1 and difference stream is greater than differential protection starting current definite value, transform er differential protection jump will result in
Lock.
By taking high voltage side of transformer as an example, the flow chart of transformer current transformer disconnection recognition methods is as shown in Fig. 2, specific
The following steps are included:
Step 1, judge whether high voltage side of transformer meets the entry condition of current transformer circuit supervision fail differentiation, entry condition
Are as follows:
IΦ1(t-nT)-IΦ1(t) > ISET1
Wherein, n is a positive integer, several cycles before the current cycle of indication transformer high-pressure side three-phase phase current
Number, IΦ1(t) transformer on high-tension side three-phase phase current magnitude when differentiating starting for broken string, IΦ1(t-nT) differentiate for broken string
The three-phase phase current magnitude of n Zhou Boqian of high voltage side of transformer, I when startingSET1For high voltage side of transformer electric current threshold value, value
Range is 0.06IN~0.08IN, INFor the secondary rated current of high voltage side of transformer current transformer.
If high voltage side of transformer is unsatisfactory for the entry condition of current transformer circuit supervision fail differentiation, high voltage side of transformer electricity is determined
Current transformer does not break.
Step 2, judge whether to meet following broken string criterion:
(1) broken string differentiates that starting preceding high voltage side of transformer three-phase phase current is not zero, and broken string differentiates transformer after starting
High-pressure side three-phase phase current does not increase；
(2) other side three-phase phase currents of transformer do not change when broken string differentiates starting, including difference of phase currents, zero
Sequence electric current and negative-sequence current；
(3) high voltage side of transformer and other side three-phase phase voltages do not change when broken string differentiates starting, including phase voltage
Sudden Changing Rate, residual voltage and residual voltage Sudden Changing Rate.
The discrimination formula of broken string criterion (1) are as follows:
Wherein, K1For constant, value range is 1.2~1.4, IΦ1.min(t-nT) transformer is high when differentiating starting for broken string
Press the minimum phase current magnitude in the three-phase current of the Zhou Boqian of side n.
The discrimination formula of broken string criterion (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current width of other sides (medium voltage side or low-pressure side) of transformer when differentiating starting for broken string
Value, IΦ2(t-nT) the three-phase phase current of n Zhou Boqian of other side (medium voltage side or low-pressure sides) of transformer when differentiating starting for broken string
Amplitude, | IΦ2(t)-IΦ2(t-nT) | the three-phase phase current magnitude of other sides of transformer and broken string differentiate when differentiating starting for broken string
The absolute value of the difference of the three-phase phase current magnitude of transformer other sides n Zhou Boqian, I when starting2(t) and 3I0(t) break respectively
The negative-sequence current amplitude and zero-sequence current amplitude of other sides of transformer, I when line differentiates startingSET2For other side electric current doors of transformer
Threshold value, value range 0.08IN~0.2IN。
If the electric current of any side is unsatisfactory for the discrimination formula of above-mentioned broken string criterion (2) in medium voltage side and low-pressure side
When, then determine to be unsatisfactory for broken string criterion (2).
The discrimination formula of broken string criterion (3) are as follows:
Wherein, UΦ(t) the three-phase phase voltage amplitude of high voltage side of transformer or other sides when differentiating starting for broken string, UΦ(t-
The three-phase phase voltage amplitude of high voltage side of transformer or n Zhou Boqian of other sides when nT) differentiating starting for broken string, | UΦ(t)-UΦ
(t-nT) | the three-phase phase voltage amplitude and broken string of high voltage side of transformer or other sides differentiate starting time-varying when differentiating starting for broken string
The absolute value of the difference of the three-phase phase voltage amplitude of n Zhou Boqian of depressor high-pressure side or other sides, 3U0(t) differentiate for broken string
The residual voltage amplitude of high voltage side of transformer or other sides when starting, 3U0(t-nT) transformer high-voltage when differentiating starting for broken string
The residual voltage amplitude of n Zhou Boqian of side or other sides, | 3U0(t)-3U0(t-nT) | transformer is high when differentiating starting for broken string
The zero of high voltage side of transformer or n Zhou Boqian of other sides when the residual voltage amplitude and broken string for pressing side or other sides differentiate starting
The absolute value of the difference of sequence voltage amplitude, USET1For Three-Phase Transformer phase voltage threshold value, value range 0.1UN~0.2UN,
USET2For transformer residual voltage threshold value, value range 0.02UN~0.1UN, UNFor bis- specified phase voltages of transformer PT.
It is, determining whether the voltage of high, medium and low three side of transformer is all satisfied sentencing for above-mentioned broken string criterion (3)
Other formula, if the voltage of any side is unsatisfactory for the discrimination formula of broken string criterion (3), judgement is unsatisfactory for broken string and differentiates item
Part (3).
Step 3, if meeting above-mentioned all broken string criterions, determine high voltage side of transformer current transformer circuit supervision fail.
If it is determined that high voltage side of transformer current transformer circuit supervision fail, then issue break alarm instruction, it can be by the break alarm
Whether instruction is sent to differential protection device, act for differential protection and provide reliable basis；The break alarm is instructed simultaneously and is sent out
It gives warning device to alarm, prompts maintenance personal's on-call maintenance.If there is high voltage side of transformer to be unsatisfactory for any one broken string
When criterion, then determine that high voltage side of transformer current transformer does not break.
In the present embodiment, positive integer n is taken as 2, can also basis in the case where not influencing CT broken string discriminant accuracy
It needs to carry out appropriate value, such as 1,3,4 is equivalent.
Transformer current transformer disconnection recognition methods in the present invention combines electric current criterion and voltage criterion, can be quasi-
Really determine whether transformer side current transformer breaks, differential protection may malfunction after efficiently solving current transformer circuit supervision fail
The problem of.
The present invention also provides a kind of transformer current transformer disconnection identification devices, comprising:
For judging whether to meet the unit of the entry condition of current transformer circuit supervision fail differentiation；
If, to the unit that following broken string criterion is judged, the broken string is sentenced for meeting the entry condition
Other condition are as follows:
(1) broken string differentiates that this side three-phase phase current of the preceding transformer of starting is not zero, and broken string differentiates transformer sheet after starting
Side three-phase phase current does not increase；
(2) other side three-phase phase currents of transformer do not change when broken string differentiates starting, including difference of phase currents, zero
Sequence electric current and negative-sequence current；
(3) this side of transformer and other side three-phase phase voltages do not change when broken string differentiates starting, including phase voltage is prominent
Variable, residual voltage and residual voltage Sudden Changing Rate；
If determining the unit of this side current transformer circuit supervision fail of transformer for meeting above-mentioned all broken string criterions.
Above-mentioned transformer current transformer disconnection identification device is actually built upon the knowledge of transformer current transformer disconnection
A kind of computer solution in other method, i.e., a kind of software architecture, the software can be run in protection equipment.Due to
The introduction of enough complete displays has been carried out to above-mentioned transformer current transformer disconnection recognition methods, therefore the broken string is identified and is filled
Each unit is no longer described in detail in setting.
Claims (6)
1. a kind of transformer current transformer disconnection recognition methods, which comprises the following steps:
Step 1, judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
Step 2, if meeting the entry condition, following broken string criterion is judged, the broken string criterion are as follows:
(1) broken string differentiates that this side three-phase phase current of the preceding transformer of starting is not zero, and broken string differentiates this side three of transformer after starting
Phase phase current does not increase；
(2) other side three-phase phase currents of transformer do not change when broken string differentiates starting, including difference of phase currents, zero sequence electricity
Stream and negative-sequence current；
(3) this side of transformer and other side three-phase phase voltages do not change when broken string differentiates starting, including phase voltage Sudden Changing Rate,
Residual voltage and residual voltage Sudden Changing Rate；
Step 3, if meeting above-mentioned all broken string criterions, determine this side current transformer circuit supervision fail of transformer；
The entry condition that current transformer circuit supervision fail described in step 1 differentiates are as follows:
IΦ1(t-nT)-IΦ1(t) > ISET1
Wherein, n is a positive integer, the number of several cycles before this current cycle of side three-phase phase current of indication transformer
Mesh, IΦ1(t) the three-phase phase current magnitude of this side of transformer, I when differentiating starting for broken stringΦ1(t-nT) when differentiating starting for broken string
The three-phase phase current magnitude of transformer this side n Zhou Boqian, ISET1For this side electric current threshold value of transformer, value range is
0.06IN~0.08IN, INFor the secondary rated current of this side current transformer of transformer.
2. transformer current transformer disconnection recognition methods according to claim 1, which is characterized in that step 2 interrupt line
The discrimination formula of criterion (1) are as follows:
Wherein, K1For constant, value range is 1.2~1.4, IΦ1.min(t-nT) this side of transformer n when differentiating starting for broken string
Minimum phase current magnitude in the three-phase current of Zhou Boqian；
The discrimination formula of broken string criterion (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of other sides of transformer, I when differentiating starting for broken stringΦ2(t-nT) sentence for broken string
Not Qi Dong when transformer other sides n Zhou Boqian three-phase phase current magnitude, | IΦ2(t)-IΦ2(t-nT) | starting is differentiated for broken string
When other sides of transformer three-phase phase current magnitude and broken string transformer other sides n Zhou Boqian when differentiating starting three-phase it is mutually electric
Flow the absolute value of the difference of amplitude, I2(t) and 3I0(t) the negative-sequence current width of other sides of transformer when respectively broken string differentiates starting
Value and zero-sequence current amplitude, ISET2For other side electric current threshold values of transformer, value range 0.08IN~0.2IN；
The discrimination formula of broken string criterion (3) are as follows:
Wherein, UΦ(t) the three-phase phase voltage amplitude of this side of transformer or other sides, U when differentiating starting for broken stringΦIt (t-nT) is disconnected
The three-phase phase voltage amplitude of the n Zhou Boqian of this side of transformer or other sides when line differentiates starting, | UΦ(t)-UΦ(t-nT) | be
Broken string differentiate starting when this side of transformer or other sides three-phase phase voltage amplitude and broken string differentiate starting when this side of transformer or
The absolute value of the difference of the three-phase phase voltage amplitude of n Zhou Boqian of other sides, 3U0(t) transformer when differentiating starting for broken string
The residual voltage amplitude of this side or other sides, 3U0(t-nT) the n week of this side of transformer or other sides when differentiating starting for broken string
The residual voltage amplitude of wavefront, | 3U0(t)-3U0(t-nT) | the zero sequence of this side of transformer or other sides when differentiating starting for broken string
The difference of the residual voltage amplitude of the n Zhou Boqian of this side of transformer or other sides is exhausted when voltage magnitude differentiates starting with broken string
To value, USET1For Three-Phase Transformer phase voltage threshold value, value range 0.1UN~0.2UN, USET2For transformer residual voltage
Threshold value, value range 0.02UN~0.1UN, UNFor bis- specified phase voltages of transformer PT.
3. transformer current transformer disconnection recognition methods according to claim 2, which is characterized in that n is equal to 2.
4. a kind of transformer current transformer disconnection identification device characterized by comprising
For judging whether to meet the unit of the entry condition of current transformer circuit supervision fail differentiation；
If, to the unit that following broken string criterion is judged, the broken string differentiates item for meeting the entry condition
Part are as follows:
(1) broken string differentiates that this side three-phase phase current of the preceding transformer of starting is not zero, and broken string differentiates this side three of transformer after starting
Phase phase current does not increase；
(2) other side three-phase phase currents of transformer do not change when broken string differentiates starting, including difference of phase currents, zero sequence electricity
Stream and negative-sequence current；
(3) this side of transformer and other side three-phase phase voltages do not change when broken string differentiates starting, including phase voltage Sudden Changing Rate,
Residual voltage and residual voltage Sudden Changing Rate；
If determining the unit of this side current transformer circuit supervision fail of transformer for meeting above-mentioned all broken string criterions；
The entry condition that the current transformer circuit supervision fail differentiates are as follows:
IΦ1(t-nT)-IΦ1(t) > ISET1
Wherein, n is a positive integer, the number of several cycles before this current cycle of side three-phase phase current of indication transformer
Mesh, IΦ1(t) the three-phase phase current magnitude of this side of transformer, I when differentiating starting for broken stringΦ1(t-nT) when differentiating starting for broken string
The three-phase phase current magnitude of transformer this side n Zhou Boqian, ISET1For this side electric current threshold value of transformer, value range is
0.06IN~0.08IN, INFor the secondary rated current of this side current transformer of transformer.
5. transformer current transformer disconnection identification device according to claim 4, which is characterized in that broken string criterion
(1) discrimination formula are as follows:
Wherein, K1For constant, value range is 1.2~1.4, IΦ1.min(t-nT) this side of transformer n when differentiating starting for broken string
Minimum phase current magnitude in the three-phase current of Zhou Boqian；
The discrimination formula of broken string criterion (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of other sides of transformer, I when differentiating starting for broken stringΦ2(t-nT) sentence for broken string
Not Qi Dong when transformer other sides n Zhou Boqian three-phase phase current magnitude, | IΦ2(t)-IΦ2(t-nT) | starting is differentiated for broken string
When other sides of transformer three-phase phase current magnitude and broken string transformer other sides n Zhou Boqian when differentiating starting three-phase it is mutually electric
Flow the absolute value of the difference of amplitude, I2(t) and 3I0(t) the negative-sequence current width of other sides of transformer when respectively broken string differentiates starting
Value and zero-sequence current amplitude, ISET2For other side electric current threshold values of transformer, value range 0.08IN~0.2IN；
The discrimination formula of broken string criterion (3) are as follows:
Wherein, UΦ(t) the three-phase phase voltage amplitude of this side of transformer or other sides, U when differentiating starting for broken stringΦIt (t-nT) is disconnected
The three-phase phase voltage amplitude of the n Zhou Boqian of this side of transformer or other sides when line differentiates starting, | UΦ(t)-UΦ(t-nT) | be
Broken string differentiate starting when this side of transformer or other sides three-phase phase voltage amplitude and broken string differentiate starting when this side of transformer or
The absolute value of the difference of the three-phase phase voltage amplitude of n Zhou Boqian of other sides, 3U0(t) transformer when differentiating starting for broken string
The residual voltage amplitude of this side or other sides, 3U0(t-nT) the n week of this side of transformer or other sides when differentiating starting for broken string
The residual voltage amplitude of wavefront, | 3U0(t)-3U0(t-nT) | the zero sequence of this side of transformer or other sides when differentiating starting for broken string
The difference of the residual voltage amplitude of the n Zhou Boqian of this side of transformer or other sides is exhausted when voltage magnitude differentiates starting with broken string
To value, USET1For Three-Phase Transformer phase voltage threshold value, value range 0.1UN~0.2UN, USET2For transformer residual voltage
Threshold value, value range 0.02UN~0.1UN, UNFor bis- specified phase voltages of transformer PT.
6. transformer current transformer disconnection identification device according to claim 5, which is characterized in that n is equal to 2.
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| CN109375028A (en) * | 2018-08-27 | 2019-02-22 | 许继集团有限公司 | A kind of broken string recognition methods of high voltage power cable circulating current sensor and device |
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