CN206132897U - Alarm device is differentiated automatically to single -phase ground connection PT disconnection fault - Google Patents
Alarm device is differentiated automatically to single -phase ground connection PT disconnection fault Download PDFInfo
- Publication number
- CN206132897U CN206132897U CN201621109631.8U CN201621109631U CN206132897U CN 206132897 U CN206132897 U CN 206132897U CN 201621109631 U CN201621109631 U CN 201621109631U CN 206132897 U CN206132897 U CN 206132897U
- Authority
- CN
- China
- Prior art keywords
- voltage
- phase
- programmable controller
- low
- controller plc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 claims abstract description 19
- 230000002085 persistent effect Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 238000010835 comparative analysis Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 28
- 230000007935 neutral effect Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 230000004069 differentiation Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000013024 troubleshooting Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an alarm device is differentiated automatically to single -phase ground connection PT disconnection fault, including three -phase pentastyle voltage transformer, a looks, B congruence C phase voltage through primary winding access generating line / circuit change high looks / line voltage into low pressure alternating voltage k1 and k2 through secondary winding and auxiliary winding, three -phase pentastyle voltage transformer and programmable controller PLC are all connected simultaneously to one -way alternating voltage changer and three -phase alternating voltage changer, and low pressure alternating voltage k1 and k2 send to respectively and send programmable controller PLC to after one -way alternating voltage changer and three -phase alternating voltage changer change DC voltage DC signal into, realize zero sequence voltage uo, three -phase AC voltage 0Ua, ub and uc's three -phase AC voltage 1. The utility model discloses an above -mentioned device differentiates that single -phase ground connection PT disconnection fault is accurate, the precision is high, the wiring is simple, easily the installation maintain and the hardware cost lower, avoid the erroneous judgement appearing and the condition of failing to judge.
Description
Technical field
This utility model is related to power domain, the dress in particular it relates to single-phase earthing/PT disconnection faults automatic discrimination is reported to the police
Put.
Background technology
PT is voltage transformer, also referred to as TV, and for measuring the special transformer of electrical network high voltage, it can be by high voltage by rule
Certainty ratio is converted to after relatively low voltage, is connected on the devices such as instrument, instrument and is acquired or measures, and voltage transformer is high
When pressure side (also known as primary side or former limit) voltage is rated voltage, low-pressure side (also known as secondary side or secondary) voltage is generally 100
Volt.PT broken strings are exactly voltage transformer high-pressure side or low-pressure side fuse melting or voltage transformer circuit joint looseness, break
Line, loose contact etc., cause voltage signal correctly to gather into, are divided into high-pressure side PT broken strings and low-pressure side PT broken string.Its
In, the broken string per side PT, and because broken string occurs a phase, biphase or three-phase are different that to be divided into PT single-phase, two-phase and three-phase disconnected
Line.There is insulation breakdown/puncture in three-phase electrical power system, only between a phase conductor and ground in single-phase earthing, causes shorted to earth.
Single-line to ground fault is modal short trouble, and 70% is accounted in short trouble.Singlephase earth fault is generating, power distribution system
Unite modal failure, mostly occur in moist, rainy weather.
In electric system of neutral-piont earth free, have when singlephase earth fault and PT (voltage transformer) disconnection fault and send out
It is raw, and be susceptible to judge by accident, fail to judge, if out of order property and separate can not in time be found and accurately be differentiated, cannot be fast
Speed is processed, and makes accident treatment time lengthening, or even fault spread, causes certain economic loss, is unfavorable for that the safety of electrical network is steady
Fixed operation.
At present, the device that single-phase earthing/PT disconnection faults are differentiated and reported to the police is not specifically designed in power system, such as
Really bus/the circuit is not equipped with complete set of protective apparatus, then the experience of operations staff can only be relied on to be differentiated, causes to judge not
In time, judge by accident or fail to judge；Even if some bus/circuits are equipped with complete set of protective apparatus, PT breakage lock devices letter is typically also only sent
Number, it is impossible to clearly determine PT broken strings and occur in high-pressure side or low-pressure side, specifically which phase, any biphase or three-phase, make
Extend into accident process time；Some complete set of protective apparatus are simple because of itself criterion, and single-phase earthing and PT are also simultaneously emitted by sometimes
Two kinds of fault alarm informations of broken string, cause operations staff directly to differentiate, cause failure/accident treatment not in time, have impact on
The safe and stable operation of electrical network.
Utility model content
This utility model overcomes the deficiencies in the prior art, there is provided single-phase earthing/PT disconnection faults automatic discrimination is reported to the police and filled
Put, differentiate accurate, high precision, wiring is simple, be easily installed maintenance and hardware cost is relatively low, it is to avoid erroneous judgement and the feelings failed to judge occur
Condition.
The technical scheme in the invention for solving the above technical problem is：Single-phase earthing/PT disconnection fault automatic discriminations
Alarm device, including
Three-phase five-pole voltage transformer, accesses A phases, B phases and the C phase voltages of bus/circuit, by pair by primary winding
Winding by high phase/line voltage be changed into rated voltage be 100V low-voltage ac voltage k1, by assists winding by high phase/
Line voltage is changed into rated voltage for low-voltage ac voltage k2；
Single alternating current voltage transmitter, while connecting three-phase five-pole voltage transformer and programmable controller PLC, three-phase
Low-voltage ac voltage k2 in pentastyle voltage transformer assists winding sends single alternating current voltage transmitter, one-way communication electricity to
Low-voltage ac voltage is changed into after DC voltage/direct current signal and is sent to programmable controller PLC by pressure transmitter, realize bus/
The signals collecting of residual voltage Uo on circuit；
Three-phase alternating current pressure transmitter, while connecting three-phase five-pole voltage transformer and programmable controller PLC, three-phase
Low-voltage ac voltage k1 on pentastyle voltage transformer auxiliary winding sends three-phase alternating current pressure transmitter, three-phase alternating voltage to
Low-voltage ac voltage is changed into after DC voltage/direct current signal and is sent to programmable controller PLC by transmitter, realizes bus/line
The signals collecting of A phase voltages amplitude Ua, B phase voltage amplitude Ub and C phase voltage amplitudes Uc on road；
Programmable controller PLC, connects touch screen, and for comparative analysiss fault type/separate information is obtained, and sends warning
Signal simultaneously shows on the touchscreen.
This device is applied to the power system of isolated neutral, is particularly suitable for the isolated neutral system of 6kV, 10kV
The single-phase earthing of system and PT disconnection faults differentiate, using the voltage magnitude of the three-phase voltage not used in prior art,
Voltage difference, residual voltage carry out the comprehensive distinguishing of single-phase earthing/PT broken string, be specifically designed for Jing in power system often occur and
The single-phase earthing and PT disconnection faults of easily erroneous judgement is differentiated and is reported to the police that empirical tests can accurately differentiate out of order type and phase
Not, fault type is single-phase earthing or PT broken strings, and the device differentiates accurate compared with differentiation is carried out using individual data in the past
Really, high precision, wiring is simple, be easily installed maintenance, it is to avoid erroneous judgement and situation about failing to judge occur.
For singlephase earth fault, it is separate that this device can be accurately judged to failure, is A phases, B phases or C phases；It is disconnected for PT
Line failure, this device can accurately differentiate generation of being out of order in which side：It is high-pressure side or low-pressure side；Differentiate generation of being out of order
Separate is A, B, C which phase, and which biphase or three-phase makes troubleshooting more targeted, shortens fault handling time.We
Case can determine fault type, can differentiate again and be out of order separate, all also not use in the prior art, belong to pioneering.This
Device directly collection be each phase phase voltage, directly reflect the state of each phase, and first gathering line voltage and then to turn again in the past
It is changed to phase voltage to compare, criterion is more direct；Phase current need not be gathered, but PT is differentiated by the voltage difference for calculating
Three-phase breaks, and such harvester is few, and wiring is simple, and hardware cost is relatively low.
In order to preferably realize being monitored failure process, there is provided persistent period and break that single-phase earthing/PT breaks
The data of continued access ground/broken string number of times, provide foundation, in the programmable controller PLC for fault analysis and handling or repair based on condition of component
Portion carries the intervalometer that can realize single-phase earthing or PT broken string persistent period measurements, also carries inside programmable controller PLC
The enumerator of the interrupted number of times measurement of single-phase earthing or PT broken strings can be realized.
Single-phase earthing/PT disconnection fault automatic discrimination alarm methods, using above-mentioned automatic discrimination alarm device in it is any
One kind, comprises the steps：
Step A) energization of automatic discrimination alarm device, initialized, isolated neutral power train is gathered incessantly
System median generatrix/circuit three-phase phase voltage amplitude Ua, Ub, Uc and its residual voltage Uo, according to the three-phase phase voltage amplitude for collecting
Whether Ua, Ub, Uc and its residual voltage Uo are zero, and the state of relative breaker and isolation switch, judge that examining system is
It is no to return if system is in stoppage in transit state in running status, if being in running status, calculate three-phase phase voltage amplitude
Difference DELTA Ua, Δ Ub and Δ Uc, the difference is the difference of former and later two scan period measured values；
Step B) according to the size of three-phase phase voltage amplitude, voltage difference and residual voltage, programmable controller PLC synthesis
Judge whether to there occurs failure, if there occurs failure, determine whether the property of failure and it is separate be single-phase earthing, the single-phase height of PT
The biphase low-pressure side broken string of pressure side broken string, PT single phase low voltages side broken string, PT, the biphase high-pressure side broken strings of PT or PT high and low pressure sides three-phase are disconnected
Line, and it is mutually or biphase where specific to which；
Step C) fault alarm is carried out according to the result of programmable controller PLC differentiation, and touched in the form of alarm window
Touch screen display out.
It is further preferred that step C) in touch screen can be with according to the intervalometer carried inside programmable controller PLC
Timing and tally function with enumerator, shows the interrupted times and duration of failure.
Preferably, step B) in singlephase earth fault determination methods be when collection residual voltage Uo>50V or A phases electricity
Pressure difference Δ Ua>0.2Ue, B, C two-phase voltage amplitude Ub and Uc are both greater than 1.2 times of rated voltage Ue, and A phase voltage amplitudes are little
When 0.8 times of rated voltage Ue, it is judged to that A phases occur singlephase earth fault.
Preferably, step B) in PT single-phase high voltages side disconnection fault determination methods be when collection residual voltage Uo >=5V
Or A phase voltage difference DELTAs Ua>0.2Ue, A phase voltage amplitude Ua<0.8Ue, and B, C two-phase voltage amplitude be respectively interposed in 0.8～
When between 1.0Ue, it is judged to that PT high-pressure sides A phases break.
Preferably, step B) in PT single phase low voltages side disconnection fault determination methods be when collection residual voltage Uo≤5V
Or A phase voltage difference DELTAs Ua>0.2Ue, A phase voltage amplitude Ua<0.1Ue, B, C two-phase voltage amplitude is respectively interposed in 0.9～
Between 1.05Ue, and during Uo≤5V, it is judged to that PT low-pressure side A phases break.
Preferably, step B) in the biphase low-pressure side disconnection faults of PT determination methods be when collection A, B two-phase voltage it is poor
Value Δ Ua, Δ Ub are both greater than 0.2Ue, and A, B two-phase voltage amplitude is both less than 0.1Ue, and C phase voltages amplitude between 0.9～
When between 1.05Ue, it is judged to the biphase broken string of PT low-pressure sides A, B.
Preferably, step B) in the determination methods of PT biphase high-pressure sides broken string or PT high and low pressure side three-phase disconnection faults be to work as
A, B, C three-phase voltage difference DELTA Ua of collection, Δ Ub and Δ Uc are both greater than 0.2Ue, and A, B, C three-phase voltage amplitude is both less than
During 0.1Ue, it is judged to that PT high-pressure sides are biphase or PT high and low pressures side three-phase breaks.
Through a large amount of actual tests, show to be measured using the method and possess following feature performance benefit：Differentiate accurate, be difficult
Generation is judged by accident, is failed to judge；Equipment fast response time, degree of accuracy is high；Wiring is simple, convenient for installation and maintenance, portable strong；System can
Autgmentability is strong, can carry out secondary development.
To sum up, the beneficial effects of the utility model are：
1st, this programme is applied to the power system of isolated neutral, is particularly suitable for the isolated neutral of 6kV, 10kV
The single-phase earthing of system and PT disconnection faults differentiate, using the three-phase voltage voltage magnitude not used in prior art,
Voltage difference, residual voltage carry out the comprehensive distinguishing of single-phase earthing/PT broken string, be specifically designed for Jing in power system often occur and
The single-phase earthing and PT disconnection faults of easily erroneous judgement differentiated and reported to the police, and can accurately differentiate out of order type and separate, failure
Type is single-phase earthing or PT broken strings, and the device differentiates accurate, precision compared with differentiation is carried out using individual data in the past
Height, wiring is simple, be easily installed maintenance, it is to avoid erroneous judgement and situation about failing to judge occur.
2nd, what this programme was directly gathered is the phase voltage of each phase, directly reflects the state of each phase, will first gathering line with the past
Then voltage be reconverted into phase voltage and compare, and criterion is more direct；Need not gather phase current, but the voltage difference by calculating
It is worth to differentiate that PT three-phases break, such harvester is few, and wiring is simple, and hardware cost is relatively low.
3rd, realize being monitored failure process, there is provided the persistent period of single-phase earthing/PT broken string and interrupted earth/disconnected
The number of times of line, is that fault analysis and handling or repair based on condition of component provide foundation.
Description of the drawings
Fig. 1 is theory diagram of the present utility model.
Specific embodiment
With reference to embodiment and accompanying drawing, detailed description further is made to this utility model, but it is of the present utility model
Embodiment not limited to this.
Symbol description：A, B, C phase voltage amplitude is represented respectively with symbol Ua, Ub, Uc；Before and after A, B, C phase voltage amplitude
The difference of two scan periods is represented respectively with Δ Ua, Δ Ub, Δ Uc；Residual voltage is represented with U0；Rated voltage is represented with Ue.
The computational methods of wherein difference are the difference of former and later two scan periods for gathering and calculating phase voltage amplitude.
Embodiment 1：
As shown in figure 1, this utility model includes single-phase earthing/PT disconnection fault automatic discrimination alarm devices, including
Three-phase five-pole voltage transformer, accesses A phases, B phases and the C phase voltages of bus/circuit, by pair by primary winding
Winding by high phase/line voltage be changed into rated voltage be 100V low-voltage ac voltage k1, by assists winding by high phase/
Line voltage is changed into rated voltage for low-voltage ac voltage k2；Three-phase five-pole voltage transformer, can be with three single-phase voltages
Transformer, or a threephase potential transformer replacement.XD, aD are the two-end-point that assists winding is accessed in Fig. 1, a, b, c for it is secondary around
Three end points that group is accessed.
Single alternating current voltage transmitter, while connecting three-phase five-pole voltage transformer and programmable controller PLC, three-phase
Low-voltage ac voltage k2 in pentastyle voltage transformer assists winding sends single alternating current voltage transmitter, one-way communication electricity to
Low-voltage ac voltage is changed into after the DC voltage/direct current signal of 0～10V/4～20mA and is sent to PLC technology by pressure transmitter
Device PLC, realizes the signals collecting of residual voltage Uo on bus/circuit；Residual voltage Uo acquisition methods can also first pass through exchange
After voltage collecting device collection three-phase alternating voltage, it is re-fed into the calculating of computer (single-chip microcomputer, single board computer, industrial computer) Jing programs and obtains
.
Three-phase alternating current pressure transmitter, while connecting three-phase five-pole voltage transformer and programmable controller PLC, three-phase
Low-voltage ac voltage k1 on pentastyle voltage transformer auxiliary winding sends three-phase alternating current pressure transmitter, three-phase alternating voltage to
Low-voltage ac voltage is changed into after the DC voltage/direct current signal of 0～10V/4～20mA and is sent to Programmable Logic Controller by transmitter
PLC, realizes the signals collecting of A phase voltages amplitude Ua, B phase voltage amplitude Ub and C phase voltage amplitudes Uc on bus/circuit；
Programmable controller PLC, connects model MT6070IH5 prestige synthetic fibre touch screen, and for comparative analysiss failure classes are obtained
Type/separate information, sends alarm signal and shows on the touchscreen.Programmable controller PLC can be also used for comparative analysiss and obtain
Single-phase earthing information, PT disconnection informations, persistent period, broken string number of times or interrupted earth information are obtained, programmable controller PLC includes
The Analog input mModule and model Schneider M340PLC of model AMI0410, the CPU module of CPS2000, analog quantity is defeated
Enter module for analog input signal to be converted to into digital signal, be then sent through in CPU module realizing the phase voltage of bus/circuit
The signals collecting of Ua, Ub, Uc and residual voltage Uo, is compared after analysis the information such as fault type/separate that obtain, and sends warning
Signal simultaneously shows on the touchscreen, in case follow-up troubleshooting is used.Analog input mModule therein can use modulus
Conversion A/D conversion equipments or ac sampling device are substituted；Programmable controller PLC can be replaced with single-chip microcomputer, single board computer, industrial computer etc.
Generation；Touch screen can be substituted with other digital display devices, host computer or phonetic alarm device；
It is single-phase to connect when neutral point in electric power system isolated neutral system, particularly 6kV, 10kV system occur singlephase earth fault
Electric current is less during ground, does not form short-circuit loop, and after safe operation of power system code regulation earth fault 1～2 can be continued to run with
Hour, but the rising of whole system non-faulting phase-to-ground voltage, if processing not in time, non-faulting phase insulation breakdown may be caused to develop
Into phase fault, failure propagation is made.PT disconnection faults can be generally divided into PT primary sides broken string and secondary side broken string, either which
The broken string of side, will all make the electric voltage exception of PT secondary circuits.This two classes failure is to power system and the safety and stability of electrical network
Operation is significant, the differentiation and alarm device, comprising a set of single-phase earthing, PT primary sides broken string, secondary side broken string it is automatic
Differentiate and alarm device, can be promptly and accurately judge electrical system bus and circuit operation in generally existing single-phase earthing with
Voltage transformer pt disconnection fault, moreover it is possible to concrete separate, the practical problem of solution power system that accurately Judging fault occurs, keeps away
Exempt to cause time lengthening or fault spread not in time because of accident treatment, it is to avoid cause immeasurable economic loss.
At present, for easily occurring and easy system single-phase earthing/PT disconnection faults of erroneous judgement, without special single-phase earthing/
PT broken strings are seen off and alarm device, are usually only occurred in some complete set of protective apparatus as PT breakage lock device conditions.To list
Mutually the failure process of ground connection/PT broken strings is not monitored, and only provides a warning message, is unfavorable for analysis and the place of consequent malfunction
Reason.At present conventional PT broken strings basis for estimation is broadly divided into the following two kinds：(1) PT symmetrically breaks, namely three-phase whole broken string
Criterion, the foundation for adopting is both less than 8V, and rated current of arbitrary phase current more than 0.06 times for three-phase voltage；This kind of judgement side
There are the following problems need to gather phase/line voltage and phase current for method, and collection capacity is more, and hardware cost is higher.Additionally, high-pressure side is biphase disconnected
Line, also meets above-mentioned criterion, erroneous judgement easily occurs.(2) the asymmetric broken string criterions of PT common are following several：Criterion one：Negative phase-sequence
Voltage is more than 8V；Criterion two：The vector sum of three-phase voltage is more than 18V, and the difference of at least modulus value of a line voltage is more than
20V；Criterion three：The difference that there is the modulus value of a line voltage is more than 18V.Using above-mentioned three kinds of criterions, there are the following problems：Above-mentioned three
Individual criterion, is differentiated that criterion is insufficient merely with single one value of negative sequence voltage or phase voltage, erroneous judgement is easily occurred and is leaked
Sentence；Above-mentioned several criterions all do not judge that PT high-pressure sides are broken or low-pressure side broken string, and which phase is not more accurate to is
Or which biphase broken string；Above-mentioned criterion is not monitored to broken string process, is unfavorable for the further detection and process of failure.
This device is applied to the power system of isolated neutral, is particularly suitable for the isolated neutral system of 6kV, 10kV
The single-phase earthing of system and PT disconnection faults differentiate；Using the voltage magnitude of the three-phase voltage not used in prior art,
Voltage difference, residual voltage carry out the comprehensive distinguishing of single-phase earthing/PT broken string, be specifically designed for Jing in power system often occur and
The single-phase earthing and PT disconnection faults of easily erroneous judgement is differentiated and is reported to the police that empirical tests can accurately differentiate out of order type and phase
Not, fault type is single-phase earthing or PT broken strings, and the device differentiates accurate compared with differentiation is carried out using individual data in the past
Really, high precision, wiring is simple, be easily installed maintenance, it is to avoid erroneous judgement and situation about failing to judge occur.
For singlephase earth fault, it is separate that this device can be accurately judged to failure, is A phases, B phases or C phases；It is disconnected for PT
Line failure, this device can accurately differentiate generation of being out of order in which side：It is high-pressure side or low-pressure side；Differentiate generation of being out of order
It is separate：It is A, B, C which phase, which biphase or three-phase makes troubleshooting more targeted, shortens fault handling time.This
Scheme can determine fault type, can differentiate again and be out of order separate, all also not use in the prior art, belong to pioneering.
This device directly collection be each phase phase voltage, directly reflect the state of each phase, will first gathering line voltage and then again with the past
Be converted to phase voltage to compare, criterion is more direct；Phase current need not be gathered, but is differentiated by the voltage difference for calculating
PT three-phases break, and such harvester is few, and wiring is simple, and hardware cost is relatively low.
Embodiment 2：
The present embodiment is preferably as follows on the basis of embodiment 1：Carrying inside the programmable controller PLC to realize
Single-phase earthing or the intervalometer of PT broken string persistent period measurements, also carrying inside programmable controller PLC can realize single-phase connecing
The enumerator of the interrupted number of times measurement of ground or PT broken strings, and can be shown by touch screen.Realization is monitored to failure process,
Persistent period and the number of times of interrupted earth/broken string there is provided single-phase earthing/PT broken strings, is fault analysis and handling or repair based on condition of component
Foundation is provided.The number of times of record single-phase earthing or PT broken strings, gathers the persistent period collection of single-phase earthing or PT broken strings, collects and defeated
Go out, do not used in the prior art, belong to pioneering.
Embodiment 3：
This utility model includes single-phase earthing/PT disconnection fault automatic discrimination alarm methods, is reported to the police using automatic discrimination and is filled
Put, comprise the steps：
Step A) energization of automatic discrimination alarm device, initialized, isolated neutral power train is gathered incessantly
System median generatrix/circuit three-phase phase voltage amplitude Ua, Ub, Uc and its residual voltage Uo, according to the three-phase phase voltage amplitude for collecting
Whether Ua, Ub, Uc and its residual voltage Uo are zero, and the state of relative breaker and isolation switch, judge that examining system is
It is no to return if system is in stoppage in transit state in running status, if being in running status, calculate three-phase phase voltage amplitude
Difference DELTA Ua, Δ Ub and Δ Uc, the difference is the difference of former and later two scan period measured values；
Step B) according to the size of three-phase phase voltage amplitude, voltage difference and residual voltage, programmable controller PLC synthesis
Judge whether to there occurs failure, if there occurs failure, determine whether the property of failure and it is separate be single-phase earthing, the single-phase height of PT
The biphase low-pressure side broken string of pressure side broken string, PT single phase low voltages side broken string, PT, the biphase high-pressure side broken strings of PT or PT high and low pressure sides three-phase are disconnected
Line, and it is mutually or biphase where specific to which；
Step C) fault alarm is carried out according to the result of programmable controller PLC differentiation, and touched in the form of alarm window
Touch screen display out.
Step C) in touch screen can be with according to the timing of the intervalometer and enumerator carried inside programmable controller PLC
And tally function, show the interrupted times and duration of failure.
Step B) in singlephase earth fault determination methods be when collection residual voltage Uo>50V or A phase voltage difference DELTAs
Ua>0.2Ue, B, C two-phase voltage amplitude Ub and Uc are both greater than 1.2 times of rated voltage Ue (Ub>1.2Ue, Uc>1.2Ue), and A
Phase voltage amplitude is less than 0.8 times of rated voltage Ue (Ua<When 0.8Ue), it is judged to that A phases occur singlephase earth fault.Other B, C
Phase single-phase earthing method of discrimination judges therewith similar, only A phases need to be changed into B phases or C phases, and then other values are to being changed to other two
.
Step B) in the determination methods of PT single-phase high voltages side disconnection fault be when the residual voltage Uo >=5V or A phase of collection is electric
Pressure difference Δ Ua>0.2Ue, A phase voltage amplitude Ua<0.9Ue, and B, C two-phase voltage amplitude is respectively interposed between 0.8～1.0Ue
When (i.e. 0.8Ue≤Ub≤1.0Ue, 0.8Ue≤Uc≤1.0Ue), it is judged to that PT high-pressure sides A phases break, Ue represents rated voltage.
Other B, C phase single-phase earthing method of discrimination judges therewith similar, only A phases need to be changed into B phases or C phases, then other value exchanges
For other two.
Step B) in the determination methods of PT single phase low voltages side disconnection fault be when the residual voltage Uo≤5V or A phase of collection is electric
Pressure difference Δ Ua>0.2Ue, A phase voltage amplitude Ua<0.1Ue, B, C two-phase voltage amplitude is respectively interposed between 0.9～1.05Ue
(i.e. 0.9Ue≤Ub≤1.05Ue 0.9Ue≤Uc≤1.05Ue), and during Uo≤5V, it is judged to that PT low-pressure side A phases break.In addition
B, C phase single-phase earthing method of discrimination judge similar therewith, only A phases need to be changed into B phases or C phases, then other values are another to being changed to
Outer two.
Step B) in the biphase low-pressure side disconnection faults of PT determination methods be when collection A, B two-phase voltage difference DELTA Ua,
Δ Ub is both greater than 0.2Ue (i.e. Δ Ua>0.2Ue、ΔUb>0.2Ue), A, B phase voltage amplitude is respectively less than 0.1Ue, and C phase voltage width
Value when (0.9Ue≤Uc≤1.05Ue), is judged to the biphase broken string of PT low-pressure sides A, B between 0.9～1.05Ue.Other B,
C phase single-phase earthing method of discrimination judges therewith similar, only A phases need to be changed into B phases or C phases, and then other values are to being changed to other two
.
Step B) in the determination methods of PT biphase high-pressure sides broken string or PT high and low pressure sides three-phase broken string be as A, B, C of collection
Three-phase voltage difference DELTA Ua, Δ Ub and Δ Uc are both greater than 0.2Ue (i.e. Δ Ua>0.2Ue、ΔUb>0.2Ue、ΔUc>0.2Ue), A,
(i.e. Ua when B, C three-phase voltage amplitude is both less than 0.1Ue<0.1Ue、Ub<0.1Ue、Uc<0.1Ue), it is judged to that PT high-pressure sides are biphase
Or PT high and low pressures side three-phase broken string.Other B, C phase single-phase earthing method of discrimination judges therewith similar, only A phases need to be changed into B
Phase or C phases, then other values are to being changed to other two.
Through a large amount of actual tests, show to be measured using the method and possess following feature performance benefit：Differentiate accurate, be difficult
Generation is judged by accident, is failed to judge；Equipment fast response time, degree of accuracy is high；Wiring is simple, convenient for installation and maintenance, portable strong；System can
Autgmentability is strong, can carry out secondary development.
The above, is only preferred embodiment of the present utility model, and any pro forma limit is not done to this utility model
System, every any simple modification, equivalent variations made to above example according to technical spirit of the present utility model each fall within
Within protection domain of the present utility model.
Claims (2)
1. single-phase earthing/PT disconnection fault automatic discrimination alarm devices, it is characterised in that include
Three-phase five-pole voltage transformer, accesses A phases, B phases and the C phase voltages of bus/circuit, by auxiliary winding by primary winding
High phase/line voltage is changed into into the low-voltage ac voltage k1 that rated voltage is 100V, it is by assists winding that high phase/line is electric
Pressure is changed into rated voltage for low-voltage ac voltage k2；
Single alternating current voltage transmitter, while connecting three-phase five-pole voltage transformer and programmable controller PLC, three-phase and five-pole
Low-voltage ac voltage k2 in formula voltage transformer assists winding sends single alternating current voltage transmitter to, and single alternating current voltage becomes
Send device that low-voltage ac voltage is changed into after DC voltage/direct current signal and be sent to programmable controller PLC, realize bus/circuit
The signals collecting of upper residual voltage Uo；
Three-phase alternating current pressure transmitter, while connecting three-phase five-pole voltage transformer and programmable controller PLC, three-phase and five-pole
Low-voltage ac voltage k1 on formula voltage transformer auxiliary winding sends three-phase alternating current pressure transmitter, three-phase alternating voltage pick-up to
Low-voltage ac voltage is changed into after DC voltage/direct current signal and is sent to programmable controller PLC by device, realizes A on bus/circuit
The signals collecting of phase voltage amplitude Ua, B phase voltage amplitude Ub and C phase voltage amplitudes Uc；
Programmable controller PLC, connects touch screen, and for comparative analysiss fault type/separate information is obtained, and sends alarm signal
And show on the touchscreen.
2. single-phase earthing according to claim 1/PT disconnection fault automatic discrimination alarm devices, it is characterised in that described
The intervalometer that can realize single-phase earthing or PT broken string persistent period measurements, programmable control are carried inside programmable controller PLC
The enumerator of the interrupted number of times measurement that can realize single-phase earthing or PT broken strings is also carried inside device PLC processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621109631.8U CN206132897U (en) | 2016-10-10 | 2016-10-10 | Alarm device is differentiated automatically to single -phase ground connection PT disconnection fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621109631.8U CN206132897U (en) | 2016-10-10 | 2016-10-10 | Alarm device is differentiated automatically to single -phase ground connection PT disconnection fault |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206132897U true CN206132897U (en) | 2017-04-26 |
Family
ID=58572259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621109631.8U Expired - Fee Related CN206132897U (en) | 2016-10-10 | 2016-10-10 | Alarm device is differentiated automatically to single -phase ground connection PT disconnection fault |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206132897U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291219A (en) * | 2016-10-10 | 2017-01-04 | 国网四川省电力公司技能培训中心 | Single-phase earthing/PT disconnection fault automatic discrimination alarm device and method |
| CN113341274A (en) * | 2021-06-10 | 2021-09-03 | 国网江苏省电力有限公司南通供电分公司 | PT power taking configuration method for power distribution overhead line disconnection fault diagnosis |
-
2016
- 2016-10-10 CN CN201621109631.8U patent/CN206132897U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291219A (en) * | 2016-10-10 | 2017-01-04 | 国网四川省电力公司技能培训中心 | Single-phase earthing/PT disconnection fault automatic discrimination alarm device and method |
| CN113341274A (en) * | 2021-06-10 | 2021-09-03 | 国网江苏省电力有限公司南通供电分公司 | PT power taking configuration method for power distribution overhead line disconnection fault diagnosis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106291219A (en) | Single-phase earthing/PT disconnection fault automatic discrimination alarm device and method | |
| CN103454517A (en) | Method for online monitoring capacitive voltage transformers | |
| CN101699306B (en) | Method for monitoring current acquisition circuit of electric power secondary system | |
| CN108879654B (en) | Remote diagnosis method based on abnormal remote measurement of abnormal equipment | |
| CN105548814B (en) | A kind of distribution line ground fault judgment method and system | |
| CN103592563A (en) | Direct current system insulation on-line monitoring device | |
| CN101915884A (en) | Identification method of ground fault phases in three-phase ungrounded system and identification device thereof | |
| CN109884453A (en) | A kind of DC filter high-voltage capacitor fault recognition method based on parameter identification | |
| CN110174585A (en) | A kind of recognition methods of the high-voltage capacitor open circuit fault of double tunning alternating current filter | |
| CN102590698B (en) | Small current grounding line selection device and control method of voltage disturbance locked line selection | |
| CN112485556A (en) | CVT fault detection method and system based on transformer substation monitoring system and storage medium | |
| CN1349103A (en) | Judgement method of one-phase earthing failure in electric distribution network | |
| KR20080046388A (en) | Multi-function terminal for distributing automation and operating method thereof | |
| CN206132897U (en) | Alarm device is differentiated automatically to single -phase ground connection PT disconnection fault | |
| CN106124920A (en) | Transformator neutral conductor virtual connection fault detection method | |
| CN201740840U (en) | Earth fault phase identification device in three-phase unearthed system | |
| CN102540012B (en) | Method and device for judging single-phase earth fault of low-current grounding system | |
| CN113419132B (en) | Early warning method and device for capacitor bank fault | |
| CN105067960B (en) | A kind of Distribution Fault Location System and its method based on big data | |
| CN104062555B (en) | The discrimination method of distribution line high resistance earthing fault characteristic harmonics | |
| CN203811747U (en) | A small current grounding line selection system | |
| CN102928722A (en) | Maloperation cause detection method for jumping lockout relay due to power frequency AC interference of transformer station | |
| CN104659760A (en) | Method for realizing automatic comprehensive protection of transformer substation | |
| CN203103948U (en) | Controller for arc extinction and over-voltage protection device | |
| CN112398104B (en) | Comprehensive monitoring protection system for insulation, arc light and line selection of power distribution network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170426 Termination date: 20181010 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |