CN104155513A - Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer - Google Patents
Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer Download PDFInfo
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- CN104155513A CN104155513A CN201410352340.0A CN201410352340A CN104155513A CN 104155513 A CN104155513 A CN 104155513A CN 201410352340 A CN201410352340 A CN 201410352340A CN 104155513 A CN104155513 A CN 104155513A
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Abstract
The invention provides an emergency metering method of an electric energy meter for a blown one-off fuse of a voltage transformer. When any phase of the fuse of the voltage transformer is blown (that is, the voltage transformer is in one-off open-phase), the emergency metering method still can complete the right metering of active electric energy of the electric energy meter without power failure by simply adjusting the wiring connection of the electric energy meter and a terminal strip, namely, by the electrified adjustment of the secondary wiring manner of the electric energy meter according to the phasor diagram principle. According to the emergency metering method, continuity of the metering is realized when a sudden power failure occurs and a customer is inconvenient or too late to cut power due to the production continuity and the like, the follow-up metering dispute is avoided, a powerful basis is provided for accuracy of the metering, consideration is given to the benefits of both the customer and a power supply company, a premise for the smooth launching of the follow-up failure repair work is provided, the harmonious relationship between the power supply part and the power consumption part is maintained, and the emergency metering method deserves wide popularization and application.
Description
Technical field
The present invention relates to electric energy meter metering method technical field, the emergent metering method of electric energy meter while relating in particular to a fuse melting of a kind of voltage transformer (VT).
Background technology
Electric energy metrical is the important component part of electrical network economy, stable operation, is the important step that electrical production is sold.Electric energy meter is the instrument that carries out power trade clearing for electricity consumption both sides in power distribution network, and its accuracy, reliability are subject to the consistent attention of power supply enterprise, are also directly connected to user's immediate interest.In recent years, in the time that client causes electrical energy meter fault because of fuse melting of voltage transformer (VT), often because client can not have a power failure in time, cannot change insurance, cause fault not get rid of in time, cause electric energy meter to leak meter electric energy, thereby produce electric weight dispute, bring negative effect to good service work.
For above-mentioned situation, the normal employing of technician multiple improvement or replacing measure for fusing insurance, application number is 201220649509.5 utility model patent, belong to 110kV and the 35kV of 35kV transformer station bus-bar potential transformer high-voltage insurance replacing booster, the pull bar of its positive and negative silk tightens up nut rotation by center, both sides are simultaneously stressed, direction is to the power at center, the block of insurance insulator is tightened up, alleviate the danger that personnel exert oneself, accelerate assistant's instrument of replacing time, this instrument is by forward lead screw, tightening bolt, baffle plate composition, this instrument rotates by tightening bolt, both sides are simultaneously stressed, direction is to the receipts power at center, the block of insurance insulator is tightened up, be convenient to change high-voltage insurance.Can guarantee that fixed screw can filigree, screw should not be dropped.Alleviate and succinct personnel change the task of insurance, reduced by people's work simultaneously, and ensured the people people's monitoring of working, lower personnel's workload, improve safety coefficient, shortened the replacing time, avoided the uneasy congruent unfavorable factor of voltage parallel device long-time running.
The utility model patent that application number is 200820173918.6 provides a kind of voltage mutual inductor built-in replacer special for high voltage fuse, comprise two semicircular arc snap rings, one end of two snap rings is hinged, the other end of two snap rings respectively arranges a connecting piece, two braces are bolted, one screw rod is respectively set on two snap rings, the free end of two screw rods all arranges external thread, installation activity depression bar on two screw rods, on movable depression bar, offer the first screw vent and the second screw vent, the first screw vent coordinates with the first screw rod, the second screw vent coordinates with the second screw rod, the free end of the first screw rod passes outside movable depression bar and is threaded with the first wing nut, the free end of the second screw rod passes outside movable depression bar and is connected with the second wing nut, groove is offered in the inner side, middle part of movable depression bar.It can solve the problem that prior art exists, and staff uses this changer, the single work that just can complete replacing high-voltage insurance, and, easy to operate and safe.
The utility model patent that application number is 201120262033.5 provides 10 kV voltage inductor safety device for framework type transformer substation, includes fixed support, upper insulating mounting support, upper current-carrying plate, top board, upper draw ring, lower shoe, deck, lower conducting plate and lower insulating mounting support composition.In a support bracket fastened side, be provided with the upper insulating mounting support and the lower insulating mounting support that split up and down, in the outer end of upper insulating mounting support, be provided with current-carrying plate, the lower end of upper current-carrying plate, is provided with top board; The outer end of lower insulating mounting support, is provided with lower conducting plate, and the upper end of lower conducting plate is provided with lower shoe; Between top board and lower shoe, be provided with draw ring, the lower end of upper draw ring is provided with deck.The utility model one-piece construction is simple, easy to use when operation, good stability, and reliability is high.Use the utility model, can make the insurance of framework type transformer substation 10kV voltage transformer (VT) change in the situation that not having a power failure, avoid having a power failure, can, in the productive life on social without impact, realize the maintenance of circuit, ensure normally carrying out of power supply.
The innovative approach of above-mentioned patent is applied to insurance itself more, but or rely on comparatively complicated more converting mechanism, or increased the complexity of insurance itself, and the fault that not can noly realize in charged situation is got rid of.Once need to have a power failure, what most clients did not just approve that current electric company carries out pass through more positive coefficient, corrigendum electric flux carry out electric weight and move back the method for benefit, only approve the electric flux that electric energy meter itself measures.Therefore, in the time of arbitrary phase fuse melting (being phase shortage of voltage transformer (VT)) of voltage transformer (VT), how, in the situation that not having a power failure, do not increase the complicacy of device, just can make electric energy meter relatively correctly measure active energy, be the problem of being badly in need of discussion.
Summary of the invention
The emergent metering method of electric energy meter while the invention provides a fuse melting of a kind of voltage transformer (VT), the method is only by adjusting the secondary connection of electric energy meter, without increasing extra mechanism, just can make electric energy meter in the situation that of single-phase disappearance, still can correctly measure active energy.
For achieving the above object, the technical solution used in the present invention is: the emergent metering method of electric energy meter when a fuse melting of a kind of voltage transformer (VT), tackle in the arbitrary single-phase fuse melting of voltage transformer (VT) primary side,, in the situation of a phase shortage of voltage transformer (VT), concrete steps are as follows:
1) the initial method of attachment between electric energy meter tail and connecting terminal block is confirmed in inspection, and voltage transformer elements that electric energy meter connects is made as respectively first, second element;
2), in the time of voltage transformer (VT) primary side A phase fuse melting, the line voltage of access electric energy meter only has U
cbnormally, the first element voltage is changed into U
cb,change into-I of electric current
b, electric energy meter the second element voltage still meets U
cb, electric current still meets I
celectric current, is connected to electric energy meter tail A phase voltage, current terminal entirety the corresponding end that C phase terminal is arranged;
3) in the time of voltage transformer (VT) primary side B phase fuse melting, the voltage U of access electric energy meter
ab, U
cball abnormal, only wired voltage U
acnormally, electric energy meter the first element access U
ac, I
a, the second element access U
ac,-I
c;
4) in the time of voltage transformer (VT) primary side C phase fuse melting, similar with A phase fuse melting situation, line voltage only has U
abnormally, electric energy meter the first element voltage still meets U
ab, electric current still meets I
a, the second element wiring is changed into U
ab,-I
b, electric energy meter tail C phase voltage, current terminal entirety are connected to the corresponding end that A phase terminal is arranged.
In step 3), select to keep A phase connection constant, electric energy meter B phase voltage line is introduced to the terminal row phase voltage end of C group, and by the exchanging into and out of line current wiring of C group, the electric energy meter phase voltage end of C group is introduced to the phase voltage terminal row end of A group.
In step 3), select to keep C phase connection constant, electric energy meter B phase voltage line is introduced to the terminal row phase voltage end of A group, and by the exchanging into and out of line current wiring of A group, the electric energy meter phase voltage end of A group is introduced to the phase voltage terminal row end of C group.
What described electric energy meter was applied is three-phase three-wire electric energy meter.
Between the current transformer that described electric energy meter is connected with it, adopt V/V wiring, the method for attachment of the input of Ji San road phase voltage, the input of two-way phase current, the output of two-way phase current.
In the starting stage of the present invention, the initial method of attachment between electric energy meter tail and connecting terminal block is confirmed in inspection, the principle analysis can be according to phase shortage time, the adjustment of the connection scheme of meeting an urgent need and change, mode of connection is not unalterable, as long as the measuring principle meeting after adjustment is applicable; In the time of voltage transformer (VT) primary side A phase or C phase fuse melting, when change connection box of electric energy meter, need access-I
belectric current, because the current transformer of situ metrology device adopts V/V wiring, does not have B phase current, and formula calculates time-I
bwith I
a+ I
creplace, and in the time that wiring is adjusted, change mutually owing to not relating to B, comparatively easy, only need the electric energy meter voltage of phase shortage, current terminal to draw one by one, final metering can be met
uIcos
requirement; In the time of voltage transformer (VT) primary side B phase fuse melting, keep A phase or C one group of wiring in mutually constant, electric energy meter B phase voltage line is introduced to the terminal row phase voltage end of another group, and exchanging into and out of line current wiring set of variations, the electric energy meter phase voltage end of set of variations is introduced to the phase voltage terminal row end of constant group, final metering can be met
uIcos
requirement.
Main Function of the present invention, while being the arbitrary phase fuse melting (being phase shortage of voltage transformer (VT)) at voltage transformer (VT), realize in the situation that not having a power failure, only by the adjustment of electric energy meter and terminal row wiring relation, still can complete the correct metering of electric energy meter active energy, thereby occur at sudden power outage, due to reasons such as continuous productions, when client's inconvenience or too late power failure, realize the continuity of metering, thereby avoid the generation of follow-up measurement dispute, for the accuracy of metering provides strong foundation, take into account client and the both sides' of electric company interests simultaneously, it is the prerequisite that consequent malfunction repair work can be carried out smoothly, the harmonious relationships for electricity consumption both sides are safeguarded, should be widely promoted and use.
Brief description of the drawings
Fig. 1 is the phasor graph in normally metering situation of the present invention.
Fig. 2 is that the electric energy meter tail in normally metering situation of the present invention goes out line chart.
Fig. 3 is the metering phasor graph in A phase phase shortage situation.
Fig. 4 is that after the adjustment in A phase phase shortage situation, electric energy meter tail goes out line chart.
Fig. 5 is electric energy meter tail and terminal row wiring figure after the adjustment in A phase phase shortage situation.
Fig. 6 is the metering phasor graph in B phase phase shortage situation.
Fig. 7 is that after the adjustment in B phase phase shortage situation, electric energy meter tail goes out line chart.
Fig. 8 is electric energy meter tail and terminal row wiring figure after the adjustment in B phase phase shortage situation.
Fig. 9 is the metering phasor graph in C phase phase shortage situation.
Figure 10 is that after the adjustment in C phase phase shortage situation, electric energy meter tail goes out line chart.
Figure 11 is electric energy meter tail and terminal row wiring figure after the adjustment in C phase phase shortage situation.
embodiment
As shown in Figure 1 to 11, the emergent metering method of electric energy meter when a fuse melting of a kind of voltage transformer (VT), tackle in the arbitrary single-phase fuse melting of voltage transformer (VT) primary side, be in the situation of a phase shortage of voltage transformer (VT), in 35kV and following system, the current transformer of situ metrology device adopts V/V wiring, is to adopt two all insulation voltage transformer (VT) once to join end to end to receive respectively ABC three-phase (connect B phase with A2 as A1 connects A phase, X1, X2 connects C phase) monitoring voltage.Such winding does not have ground connection, and in system generation singlephase earth fault, the VV mode of connection is difficult for causing system resonance, is line voltage but this mode of connection measures, can not measure phase voltage, singlephase earth fault that can not monitoring system.In the present invention, owing to there is no B phase current, in the situation that wiring is correct, A phase and the C mutually winding of the current transformer that connects flow through respectively I
a, I
c, the resultant current flowing through in their public wiring is I
b, according to Kirchhoff's current law (KCL) ∑, I=0 is known, I
a+ I
b+ I
c=0, so-I
b=I
a+ I
c, the advantage of this mode of connection maximum is to have saved a single-phase current transformer, thereby has saved investment.Concrete steps are as follows:
1) the initial method of attachment between electric energy meter tail and connecting terminal block is confirmed in inspection, and voltage transformer elements that electric energy meter connects is made as respectively first, second element;
For the method for attachment of V/V formula, as shown in Figure 1 and Figure 2, the method of attachment of the phase voltage input of Ji San road, the input of two-way phase current, the output of two-way phase current, its initial mode of connection is taking the terminal label of electric energy meter tail as punctual, have 7 paths, initial connected mode is: connect A phase voltage end of incoming cables No. 2, connect B phase voltage end of incoming cables No. 5, connect C phase voltage end of incoming cables No. 8; Connect A phase current end of incoming cables No. 1, connect C phase current end of incoming cables No. 7; Connect A phase current leading-out terminal for No. 3, connect C phase current leading-out terminal for No. 9; So just can ensure that voltage, the electric current input and output of adjacent line terminals are homophase, 1,2,3 is A group; 5 is B group; 7,8,9 is C group.
According to this mode of connection and principle, can draw out vector analysis figure, now can calculate the relation of initial current, voltage and electric energy meter three phases active power to be measured: two mutual inductors introducing electric energy meter are made as respectively to first, second element, and the voltage of first element of electric energy meter is U
ab, electric current is I
a, its phasing degree is 30 °+φ
a; The voltage of second element of access electric energy meter is U
cb, electric current is I
c, its phasing degree is 30 °-φ
c; In the time of three-phase circuit full symmetric, the three phases active power formula of its measurement is: (30 °+φ of P=UIcos
a(30 °-φ of)+UIcos
c)=
uIcos φ; When voltage symmetry and load current when asymmetric, the three phases active power formula of its measurement is: P=U
abi
a(30 °+φ of cos
a)+U
cbi
c(30 °-φ of cos
c).
2), in the time of voltage transformer (VT) primary side A phase fuse melting, as shown in Fig. 4, Fig. 5, Fig. 6, three-phase three-wire electric energy meter the first element institute making alive is U
ab=-U
b, access electric current is I
a, its phase difference
1=60 °+φ; The second element institute making alive is U
cb, the electric current of access is I
c, its phase difference
2=30 °-φ, because the line voltage of access electric energy meter only has U
cbnormally, the first element voltage is changed into U
cb,change into-I of electric current
b, electric energy meter the second element voltage still meets U
cb, electric current still meets I
c;
According to above-mentioned analysis principle, can draw out vector analysis figure, and regulate the mode of connection, by the terminal 2 leading-in terminal row C phase phase voltage terminals 8 of electric energy meter A phase phase voltage, the terminal 1 leading-in terminal row C phase inlet wire phase current terminal 7 of electric energy meter A phase inlet wire phase current, the terminal 3 leading-in terminal row C phase outlet phase current terminals 9 of electric energy meter A phase outlet phase current, A organizes wiring between former 1,2,3 terminals and removes or remain unchanged, all the other each terminal connections remain unchanged, now, the computing formula P=P of concrete active power
1+ P
2==U
cbi
bcos (30 °+
b)+U
cbi
ccos (30 °-
c)=
uIcos
, can find out from electric energy meter power expression, the electric energy meter after change wiring can correctly measure.
3), in the time of voltage transformer (VT) primary side B phase fuse melting, as shown in Fig. 7, Fig. 8, Fig. 9, three-phase three-wire electric energy meter the first element institute making alive is 1/2U
ac, access electric current is I
a, its phase difference
1=30 °-φ; The second element institute making alive is 1/2U
ca, access electric current is I
c, its phase difference
2=30 °+φ; Due to the voltage U of access electric energy meter
ab, U
cball abnormal, only wired voltage U
acnormally, can be electric energy meter the first element access U
ac, I
a, the second element access U
ac,-I
c;
According to above-mentioned analysis principle, can draw out vector analysis figure, and regulate the mode of connection, by the terminal 8 leading-in terminal row A phase phase voltage terminals 2 of electric energy meter C phase phase voltage, the terminal 5 leading-in terminal row C phase phase voltage terminals 8 of electric energy meter B phase phase voltage, the terminal 7 leading-in terminal row C phase outlet phase current terminals 9 of electric energy meter C phase inlet wire phase current, the terminal 9 leading-in terminal row C phase inlet wire phase current terminals 7 of electric energy meter C phase outlet phase current, all the other each terminal connections remain unchanged, now, the computing formula P=P of concrete active power
1+ P
2==U
aci
acos (30 °+
b)+U
aci
ccos (30 °-
c)=
uIcos
, can find out from electric energy meter power expression, the electric energy meter after change wiring can correctly measure.
4) in the time of voltage transformer (VT) primary side C phase fuse melting, similar with A phase fuse melting situation, as shown in Fig. 9, Figure 10, Figure 11, because line voltage only has U
abnormally, electric energy meter the first element voltage still meets U
ab, electric current still meets I
a, the second element wiring is changed into U
ab,-I
b.
According to above-mentioned analysis principle, can draw out vector analysis figure, and regulate the mode of connection, by the terminal 8 leading-in terminal row A phase phase voltage terminals 2 of electric energy meter C phase phase voltage, the terminal 7 leading-in terminal row A phase inlet wire phase current terminals 1 of electric energy meter C phase inlet wire phase current, the terminal 9 leading-in terminal row A phase outlet phase current terminals 3 of electric energy meter C phase outlet phase current, all the other each terminal connections remain unchanged, now, the computing formula P=P of concrete active power
1+ P
2==U
abi
acos (30 °+
a)+U
abi
bcos (30 °-
b)=
uIcos
, can find out from electric energy meter power expression, the electric energy meter after change wiring can correctly measure.
In the starting stage of the present invention, the initial method of attachment between electric energy meter tail and connecting terminal block is confirmed in inspection, the principle analysis can be according to phase shortage time, the adjustment of the connection scheme of meeting an urgent need and change, mode of connection is not unalterable, as long as the measuring principle meeting after adjustment is applicable; In the time of voltage transformer (VT) primary side A phase or C phase fuse melting, when change connection box of electric energy meter, need access-I
belectric current, because the current transformer of situ metrology device adopts V/V wiring, does not have B phase current, and formula calculates time-I
bwith I
a+ I
creplace, and in the time that wiring is adjusted, change mutually owing to not relating to B, comparatively easy, only need the electric energy meter voltage of phase shortage, current terminal to draw one by one, final metering can be met
uIcos
requirement; In the time of voltage transformer (VT) primary side B phase fuse melting, keep A phase or C one group of wiring in mutually constant, electric energy meter B phase voltage line is introduced to the terminal row phase voltage end of another group, and exchanging into and out of line current wiring set of variations, the electric energy meter phase voltage end of set of variations is introduced to the phase voltage terminal row end of constant group, final metering can be met
uIcos
requirement.The present invention is in the time of arbitrary phase fuse melting (being phase shortage of voltage transformer (VT)) of voltage transformer (VT), realize in the situation that not having a power failure, only by the adjustment of electric energy meter and terminal row wiring relation, still can complete the correct metering of electric energy meter active energy, thereby occur at sudden power outage, due to reasons such as continuous productions, when client's inconvenience or too late power failure, realize the continuity of metering, thereby avoid the generation of follow-up measurement dispute, for the accuracy of metering provides strong foundation, take into account client and the both sides' of electric company interests simultaneously, it is the prerequisite that consequent malfunction repair work can be carried out smoothly, the harmonious relationships for electricity consumption both sides are safeguarded, should be widely promoted and use.
Claims (5)
1. the emergent metering method of an electric energy meter when fuse melting of voltage transformer (VT), tackles in the arbitrary single-phase fuse melting of voltage transformer (VT) primary side,, in the situation of a phase shortage of voltage transformer (VT), it is characterized in that: concrete steps are as follows:
1) the initial method of attachment between electric energy meter tail and connecting terminal block is confirmed in inspection, and voltage transformer elements that electric energy meter connects is made as respectively first, second element;
2), in the time of voltage transformer (VT) primary side A phase fuse melting, the line voltage of access electric energy meter only has U
cbnormally, the first element voltage is changed into U
cb,change into-I of electric current
b, electric energy meter the second element voltage still meets U
cb, electric current still meets I
celectric current, is connected to electric energy meter tail A phase voltage, current terminal entirety the corresponding end that C phase terminal is arranged;
3) in the time of voltage transformer (VT) primary side B phase fuse melting, the voltage U of access electric energy meter
ab, U
cball abnormal, only wired voltage U
acnormally, electric energy meter the first element access U
ac, I
a, the second element access U
ac,-I
c;
4) in the time of voltage transformer (VT) primary side C phase fuse melting, similar with A phase fuse melting situation, line voltage only has U
abnormally, electric energy meter the first element voltage still meets U
ab, electric current still meets I
a, the second element wiring is changed into U
ab,-I
b, electric energy meter tail C phase voltage, current terminal entirety are connected to the corresponding end that A phase terminal is arranged.
2. the emergent metering method of an electric energy meter when fuse melting of voltage transformer (VT) as claimed in claim 1, it is characterized in that: in described step 3), select to keep A phase connection constant, electric energy meter B phase voltage line is introduced to the terminal row phase voltage end of C group, and by the exchanging into and out of line current wiring of C group, the electric energy meter phase voltage end of C group is introduced to the phase voltage terminal row end of A group.
3. the emergent metering method of an electric energy meter when fuse melting of voltage transformer (VT) as claimed in claim 1, it is characterized in that: in described step 3), select to keep C phase connection constant, electric energy meter B phase voltage line is introduced to the terminal row phase voltage end of A group, and by the exchanging into and out of line current wiring of A group, the electric energy meter phase voltage end of A group is introduced to the phase voltage terminal row end of C group.
4. the emergent metering method of an electric energy meter when fuse melting of voltage transformer (VT) as claimed in claim 2 or claim 3, is characterized in that: described electric energy meter application be three-phase three-wire electric energy meter.
5. the emergent metering method of an electric energy meter when fuse melting of voltage transformer (VT) as claimed in claim 2 or claim 3, it is characterized in that: between the current transformer that described electric energy meter is connected with it, adopt V/V wiring, the method for attachment of the input of Ji San road phase voltage, the input of two-way phase current, the output of two-way phase current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410352340.0A CN104155513A (en) | 2014-07-24 | 2014-07-24 | Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410352340.0A CN104155513A (en) | 2014-07-24 | 2014-07-24 | Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104155513A true CN104155513A (en) | 2014-11-19 |
Family
ID=51881066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410352340.0A Pending CN104155513A (en) | 2014-07-24 | 2014-07-24 | Emergency metering method of electric energy meter for blown one-off fuse of voltage transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509427A (en) * | 2020-12-09 | 2021-03-16 | 广东电网有限责任公司 | Training drawing board for electric energy metering wiring |
| CN112557719A (en) * | 2020-11-06 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Emergency metering method for high-supply high-metering voltage phase-loss compensation electric quantity |
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2014
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| CN103941154A (en) * | 2014-04-03 | 2014-07-23 | 昆明理工大学 | Ungrounded system single-phase earth fault monitoring device and method |
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| 乔璇等: "电压互感器一次缺相时电能表准确计量的接线方法", 《供用电》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557719A (en) * | 2020-11-06 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Emergency metering method for high-supply high-metering voltage phase-loss compensation electric quantity |
| CN112509427A (en) * | 2020-12-09 | 2021-03-16 | 广东电网有限责任公司 | Training drawing board for electric energy metering wiring |
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Application publication date: 20141119 |