CN104330619A - Transformer electric energy meter and thermal equilibrium calculating alarm method thereof - Google Patents
Transformer electric energy meter and thermal equilibrium calculating alarm method thereof Download PDFInfo
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Abstract
The invention relates to a transformer electric energy meter and a thermal equilibrium calculating alarm method thereof, for well solving the problem in the prior art that a transformer finally cannot work normally or is burnt in case of continuous use of the transformer after a temperature exceeds a limit temperature. The main points of the technical scheme are as follows: the transformer electric energy meter comprises a current sampling circuit, a voltage sampling circuit, a three-phase electric energy metering chip, a main processing chip, a timer counter, an LCD circuit, a memory, a communication interface, an ESAM interface, a transformer electric energy meter ESAM module, an output interface, a power module, a power management module and an expansion interface. The current sampling circuit detects currents of three-phase power, the detection end of the voltage sampling circuit is connected with the three-phase power, the output ends of the current sampling circuit and the voltage sampling circuit are connected with the input end of the three-phase electric energy metering chip, the output end of the three-phase electric energy metering chip is electrically connected with the main processing chip, and the input end of the power module is connected with the three-phase power.
Description
Technical field
The invention belongs to electric energy meter and control method thereof, particularly a kind of transformer electric energy meter and heat Balance Calculation alarm method thereof.
Background technology
Transformer is when continuous firing, own temperature constantly raises, temperature is too high, often work affecting work, after temperature oversteps the extreme limit temperature, transformer continuation use cannot normally work or burn, therefore prior art is utilized, how to study a kind of temperature being extrapolated transformer work generation by measurement electric line copper loss, thermal equilibrium value, thus the temperature of control transformer of adopting an effective measure, avoid transformer burn ring situation occur transformer electric energy meter and heat Balance Calculation alarm method imperative.
China Patent Publication No. CN202815085U, March 20 2013 day for announcing, disclose a kind of three-phase intelligent electric-energy meter, comprise control module, metering units, communication unit, man-machine interaction unit, infrared wakeup unit based on photodiode, ESAM safe unit, storage unit and output unit, described communication unit comprises RS485 communication module and infrared module, metering units, RS485 communication module, infrared module, man-machine interaction unit, infrared wakeup unit, ESAM safe unit, storage unit and output unit are electrically connected with control module respectively.The utility model adopts photodiode to build wake-up circuit, can make to wake electric energy meter up in low power consumpting state operation during system power failure, and ensured the serviceable life of battery, good reliability, security is high, reduces production cost simultaneously.But this technical scheme still exists transformer when continuous firing, and own temperature constantly raises, and temperature is too high, often work affecting work, after temperature oversteps the extreme limit temperature, transformer continues to use the problem that will finally cannot normally work or burn.
Summary of the invention
The object of the invention is to solve in above-mentioned prior art and there is transformer when continuous firing, own temperature constantly raises, temperature is too high, often work affecting work, after temperature oversteps the extreme limit temperature, transformer continues to use and will finally cause the problem that cannot normally work or burn, and provides a kind of utilization and measures copper loss (I
2) time integral value, thermal equilibrium (I
2-K) aggregate-value transformer electric energy meter and heat Balance Calculation alarm method.
The technical solution adopted for the present invention to solve the technical problems is: a kind of transformer electric energy meter, is applicable to the transformer power test of three-phase electricity, it is characterized in that: comprise current sampling circuit, voltage sampling circuit, three-phase electrical energy computation chip, main process chip, timer conter, LCD display circuit, storer, communication interface, ESAM interface, transformer electric energy meter ESAM module, output interface, power module, power management module and expansion interface, described current sampling circuit detects the electric current of three-phase electricity, the test side of voltage sampling circuit is connected with three-phase electricity, described current sampling circuit is all connected with the input end of described three-phase electrical energy computation chip with the output terminal of voltage sampling circuit, the output terminal of described three-phase electrical energy computation chip is electrically connected with described main process chip, the input end of described power module is connected with three-phase electricity, the output terminal of power module is electrically connected with power management module, described power management module is also electrically connected with power down reserve battery, described power management module is that transformer electric energy meter is powered, described timer conter, LCD display circuit, storer, communication interface, output interface and expansion interface are all electrically connected with described main process chip, and described transformer electric energy meter ESAM module is electrically connected with described main process chip by ESAM interface.Electric current and voltage signal flow into through Wiring port and show to count, through sensor element, carried out sampling and calculate to three-phase instantaneous value by ADE7858, MCU is supplied to the form of umber of pulse or electric flux, realize accumulative, the calculating of electricity, instantaneous flow metering and the storages such as total and each point phase voltage, electric current, power, power factor, and to data analysis, obtain the functions such as current electric grid ruuning situation, record grid event, load process, display and data communication.
As preferably, described main process chip is STM32F100_VCT6 single-chip microcomputer, and described three-phase electrical energy computation chip is ADE7858 chip.
As preferably, described output interface comprises the warning output interface circuit be connected with alarm and the on-load switch external interface circuit be connected with on-load switch, an input/output port of described main process chip is electrically connected with warning output interface circuit as alerting signal output pin, and another input/output port of described main process chip is electrically connected with on-load switch external interface circuit as on-load switch control signal output pin.
As preferably, described warning output interface circuit comprises triode Q1, transient voltage suppression diode TVS1, electric capacity C36, electric capacity C37, electric capacity C38, voltage stabilizing diode D2, resistance R23, resistance R25, resistance R27 and relay K 1, the alerting signal output pin of described main process chip is by electric capacity C36 ground connection, the alerting signal output pin of described main process chip is connected with the base stage of triode Q1 by resistance R23, the alerting signal output pin of described main process chip is connected with the emitter of triode Q1 by resistance R25, the grounded emitter of described triode Q1, the collector of described triode Q1 is connected with the anode of voltage stabilizing diode D2, the negative electrode of described voltage stabilizing diode D2 is connected with the first end of resistance R27, second end of described resistance R27 is connected with the digital voltage output terminal of power management module, second end of described resistance R27 is by electric capacity C37 ground connection, the two ends of described voltage stabilizing diode D2 also with electric capacity C38, the coils from parallel connection of coils of transient voltage suppression diode TVS1 and relay K 1, the contact of described relay K 1 is single-pole double-throw (SPDT) contact, the contact of relay K 1 comprises relay K 1 moving contact, relay K 1 first stationary contact and relay K 1 second stationary contact, described relay K 1 first stationary contact is opening contact, described relay K 1 moving contact is connected with the common port of alarm, described relay K 1 second stationary contact is connected with the input end of described alarm.
As preferably, described on-load switch external interface circuit comprises triode Q2, transient voltage suppression diode TVS2, electric capacity C39, electric capacity C40, electric capacity C41, voltage stabilizing diode D3, resistance R24, resistance R26, resistance R28 and relay K 2, the on-load switch control signal output pin of described main process chip is by electric capacity C40 ground connection, the on-load switch control signal output pin of described main process chip is connected with the base stage of triode Q2 by resistance R24, the on-load switch control signal output pin of described main process chip is connected with the emitter of triode Q2 by resistance R26, the grounded emitter of described triode Q2, the collector of described triode Q2 is connected with the anode of voltage stabilizing diode D3, the negative electrode of described voltage stabilizing diode D3 is connected with the first end of resistance R28, second end of described resistance R28 is connected with the digital voltage output terminal of power management module, second end of described resistance R28 is by electric capacity C40 ground connection, the two ends of described voltage stabilizing diode D3 also with electric capacity C41, the coils from parallel connection of coils of transient voltage suppression diode TVS2 and relay K 2, the contact of described relay K 2 is single-pole double-throw (SPDT) contact, the contact of relay K 2 comprises relay K 2 moving contact, relay K 2 first stationary contact and relay K 2 second stationary contact, described relay K 2 first stationary contact is connected with the disconnection input end of on-load switch, described relay K 2 second stationary contact is connected with the closed input end of on-load switch, described relay K 2 moving contact is connected with the described common port meeting switch.
A heat Balance Calculation alarm method for transformer electric energy meter, is applicable to transformer electric energy meter as claimed in claim 1, it is characterized in that: the heat Balance Calculation alarm method of described transformer electric energy meter comprises the following steps:
Step one: transformer electric energy meter electrification reset;
Step 2: system clock carries out reset processing;
Step 3: system peripheral equipment receives reset signal and carries out reset processing;
Step 4: recover normally to measure, transformer electric energy meter calculates instantaneous iron loss, instantaneous copper loss and current calorie value successively according to Information Monitoring;
Step 5: transformer electric energy meter is extrapolated the current aggregate-value of thermal equilibrium according to instantaneous iron loss, instantaneous copper loss and current calorie value and current for current thermal equilibrium aggregate-value and the threshold value manually set contrasted, the threshold value according to artificial setting provides corresponding control signal.
As preferably, in step 4, the active power of iron loss is LEF
w=G*V
2; Iron loss reactive power is LEF
var=B*V
2; Copper loss active power is LCD
w=R*I
2; Copper loss reactive power is LCD
var=X*I
2; Conductance G in formula, susceptance B resistance R and reactance X obtain by manual measurement and input in transformer electric energy meter;
Three-phase total losses are: iron loss general power of gaining merit is Δ W
fE=LFE
a,W+ LFE
b,W+ LFE
c,W, general power that iron loss is idle is Δ Var
fE=LFE
a, var+ LFE
b, var+ LFE
c, var, copper loss general power of gaining merit is Δ W
cU=LCU
a,W+ LCU
b,W+ LCU
c,Wgeneral power that copper loss is idle is Δ Var
cU=LCU
a, var+ LCU
b, var+ LCU
c, vartotal losses are Q=Δ W
fE+ Δ W
cU+ Δ Var
fE+ Δ Var
cU.
As preferably, in described step 5, adopt the current heat produced during the operation of radiating surface area method calculating transformer: Δ T=Q/ α * A
t
α is transformer coefficient of heat transfer, A
tfor transformer surface radiating area, thermal equilibrium cumulative data is
wherein, K is transformer temperature rise coefficient.By thermal equilibrium algorithm, electric energy meter can by the loss gathering voltage, electric current calculates current transformer, due to transformer loss and heating direct proportionality, the real-time temperature rise situation of transformer can be calculated thus, again according to the self performance characterisitic parameter of transformer, can Real-Time Monitoring transformer operating mode, analyze to electric company, leading subscriber in order, safety utilization of electric power brings convenience.
As preferably, described K data is by full-load test data acquisition.
As preferably, S11 series 10kV, rated capacity 100KVA, low pressure 0.4KV, at cos=0.9, when A type insulating transformer in environment temperature 25 degree of situations is in rated capacity situation, according to Road test result and temperature rise test result at full capacity, by formula Δ T=Q/ μ, draw μ=Q/ Δ T, show that transformer coefficient of heat transfer is 59.
The significant substantial effect of the present invention is: electric current and voltage signal flow into through Wiring port and show to count, through sensor element, carried out sampling and calculate to three-phase instantaneous value by ADE7858, MCU is supplied to the form of umber of pulse or electric flux, realize the accumulative of electricity, calculate, total and each point phase voltage, electric current, power, instantaneous flow metering and the storages such as power factor, and to data analysis, obtain current electric grid ruuning situation, record grid event, load process, the functions such as display and data communication, by thermal equilibrium algorithm, electric energy meter can by gathering voltage, electric current calculates the loss of current transformer, due to transformer loss and heating direct proportionality, the real-time temperature rise situation of transformer can be calculated thus, again according to the self performance characterisitic parameter of transformer, can Real-Time Monitoring transformer operating mode, analyze to electric company, leading subscriber is orderly, safety utilization of electric power brings convenience.
Accompanying drawing explanation
Fig. 1 is a kind of circuit block diagram of the present invention;
Fig. 2 is a kind of circuit diagram of output interface circuit of reporting to the police in the present invention;
Fig. 3 is a kind of circuit diagram of on-load switch external interface circuit in the present invention.
In figure: 1, current sampling circuit, 2, voltage sampling circuit, 3, three-phase electrical energy computation chip, 4, main process chip, 5, LCD display circuit, 6, storer, 7, communication interface, 8, ESAM interface, 9, output interface, 10, expansion interface, 11, power management module, 12, power module, 13, power down reserve battery, 14, timer conter.
Embodiment
Below by specific embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1:
A kind of transformer electric energy meter is (see accompanying drawing 1, accompanying drawing 2 and accompanying drawing 3), be applicable to the transformer power test of three-phase electricity, comprise current sampling circuit 1, voltage sampling circuit 2, three-phase electrical energy computation chip 3, main process chip 4, timer conter 14, LCD display circuit 5, storer 6, communication interface 7, ESAM interface 8, transformer electric energy meter ESAM module, output interface 9, power module 12, power management module 11 and expansion interface 10, described current sampling circuit detects the electric current of three-phase electricity, the test side of voltage sampling circuit is connected with three-phase electricity, described current sampling circuit is all connected with the input end of described three-phase electrical energy computation chip with the output terminal of voltage sampling circuit, the output terminal of described three-phase electrical energy computation chip is electrically connected with described main process chip, the input end of described power module is connected with three-phase electricity, the output terminal of power module is electrically connected with power management module, described power management module is also electrically connected with power down reserve battery 13, described power management module is that transformer electric energy meter is powered, described timer conter, LCD display circuit, storer, communication interface, output interface and expansion interface are all electrically connected with described main process chip, and described transformer electric energy meter ESAM module is electrically connected with described main process chip by ESAM interface.Described main process chip is STM32F100_VCT6 single-chip microcomputer, and described three-phase electrical energy computation chip is ADE7858 chip.Described output interface comprises the warning output interface circuit be connected with alarm and the on-load switch external interface circuit be connected with on-load switch, an input/output port of described main process chip is electrically connected with warning output interface circuit as alerting signal output pin, and another input/output port of described main process chip is electrically connected with on-load switch external interface circuit as on-load switch control signal output pin.Described warning output interface circuit comprises triode Q1, transient voltage suppression diode TVS1, electric capacity C36, electric capacity C37, electric capacity C38, voltage stabilizing diode D2, resistance R23, resistance R25, resistance R27 and relay K 1, the alerting signal output pin of described main process chip is by electric capacity C36 ground connection, the alerting signal output pin of described main process chip is connected with the base stage of triode Q1 by resistance R23, the alerting signal output pin of described main process chip is connected with the emitter of triode Q1 by resistance R25, the grounded emitter of described triode Q1, the collector of described triode Q1 is connected with the anode of voltage stabilizing diode D2, the negative electrode of described voltage stabilizing diode D2 is connected with the first end of resistance R27, second end of described resistance R27 is connected with the digital voltage output terminal of power management module, second end of described resistance R27 is by electric capacity C37 ground connection, the two ends of described voltage stabilizing diode D2 also with electric capacity C38, the coils from parallel connection of coils of transient voltage suppression diode TVS1 and relay K 1, the contact of described relay K 1 is single-pole double-throw (SPDT) contact, the contact of relay K 1 comprises relay K 1 moving contact, relay K 1 first stationary contact and relay K 1 second stationary contact, described relay K 1 first stationary contact is opening contact, described relay K 1 moving contact is connected with the common port of alarm, described relay K 1 second stationary contact is connected with the input end of described alarm.Described on-load switch external interface circuit comprises triode Q2, transient voltage suppression diode TVS2, electric capacity C39, electric capacity C40, electric capacity C41, voltage stabilizing diode D3, resistance R24, resistance R26, resistance R28 and relay K 2, the on-load switch control signal output pin of described main process chip is by electric capacity C40 ground connection, the on-load switch control signal output pin of described main process chip is connected with the base stage of triode Q2 by resistance R24, the on-load switch control signal output pin of described main process chip is connected with the emitter of triode Q2 by resistance R26, the grounded emitter of described triode Q2, the collector of described triode Q2 is connected with the anode of voltage stabilizing diode D3, the negative electrode of described voltage stabilizing diode D3 is connected with the first end of resistance R28, second end of described resistance R28 is connected with the digital voltage output terminal of power management module, second end of described resistance R28 is by electric capacity C40 ground connection, the two ends of described voltage stabilizing diode D3 also with electric capacity C41, the coils from parallel connection of coils of transient voltage suppression diode TVS2 and relay K 2, the contact of described relay K 2 is single-pole double-throw (SPDT) contact, the contact of relay K 2 comprises relay K 2 moving contact, relay K 2 first stationary contact and relay K 2 second stationary contact, described relay K 2 first stationary contact is connected with the disconnection input end of on-load switch, described relay K 2 second stationary contact is connected with the closed input end of on-load switch, described relay K 2 moving contact is connected with the described common port meeting switch.
A heat Balance Calculation alarm method for transformer electric energy meter, is applicable to above-mentioned transformer electric energy meter, and the heat Balance Calculation alarm method of described transformer electric energy meter comprises the following steps:
Step one: transformer electric energy meter electrification reset;
Step 2: system clock carries out reset processing;
Step 3: system peripheral equipment receives reset signal and carries out reset processing;
Step 4: recover normally to measure, transformer electric energy meter calculates instantaneous iron loss, instantaneous copper loss and current calorie value successively according to Information Monitoring;
Step 5: transformer electric energy meter is extrapolated the current aggregate-value of thermal equilibrium according to instantaneous iron loss, instantaneous copper loss and current calorie value and current for current thermal equilibrium aggregate-value and the threshold value manually set contrasted, the threshold value according to artificial setting provides corresponding control signal.
As preferably, in step 4, the active power of iron loss is LEF
w=G*V
2; Iron loss reactive power is LEF
var=B*V
2; Copper loss active power is LCD
w=R*I
2; Copper loss reactive power is LCD
var=X*I
2; Conductance G in formula, susceptance B resistance R and reactance X obtain by manual measurement and input in transformer electric energy meter;
Three-phase total losses are: iron loss general power of gaining merit is Δ W
fE=LFE
a,W+ LFE
b,W+ LFE
c,W, general power that iron loss is idle is Δ Var
fE=LFE
a, var+ LFE
b, var+ LFE
c, var, copper loss general power of gaining merit is Δ W
cU=LCU
a,W+ LCU
b,W+ LCU
c,Wgeneral power that copper loss is idle is Δ Var
cU=LCU
a, var+ LCU
b, var+ LCU
c, vartotal losses are Q=Δ W
fE+ Δ W
cU+ Δ Var
fE+ Δ Var
cU.
As preferably, in described step 5, adopt the current heat produced during the operation of radiating surface area method calculating transformer: Δ T=Q/ α * A
t
α is transformer coefficient of heat transfer, A
tfor transformer surface radiating area, thermal equilibrium cumulative data is
wherein, K is transformer temperature rise coefficient.By thermal equilibrium algorithm, electric energy meter can by the loss gathering voltage, electric current calculates current transformer, due to transformer loss and heating direct proportionality, the real-time temperature rise situation of transformer can be calculated thus, again according to the self performance characterisitic parameter of transformer, can Real-Time Monitoring transformer operating mode, analyze to electric company, leading subscriber in order, safety utilization of electric power brings convenience.
Described K data is by full-load test data acquisition.S11 series 10kV, rated capacity 100KVA, low pressure 0.4KV, at cos=0.9, when A type insulating transformer in environment temperature 25 degree of situations is in rated capacity situation, according to Road test result and temperature rise test result at full capacity, by formula Δ T=Q/ μ, draw μ=Q/ Δ T, show that transformer coefficient of heat transfer is 59.
Electric current and voltage signal flow into through Wiring port and show to count, through sensor element, carried out sampling and calculate to three-phase instantaneous value by ADE7858, MCU is supplied to the form of umber of pulse or electric flux, realize the accumulative of electricity, calculate, total and each point phase voltage, electric current, power, instantaneous flow metering and the storages such as power factor, and to data analysis, obtain current electric grid ruuning situation, record grid event, load process, the functions such as display and data communication, by thermal equilibrium algorithm, electric energy meter can by gathering voltage, electric current calculates the loss of current transformer, due to transformer loss and heating direct proportionality, the real-time temperature rise situation of transformer can be calculated thus, again according to the self performance characterisitic parameter of transformer, can Real-Time Monitoring transformer operating mode, analyze to electric company, leading subscriber is orderly, safety utilization of electric power brings convenience.
Above-described embodiment is one of the present invention preferably scheme, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technical scheme described in claim.
Claims (10)
1. a transformer electric energy meter, is applicable to the transformer power test of three-phase electricity, it is characterized in that: comprise current sampling circuit, voltage sampling circuit, three-phase electrical energy computation chip, main process chip, timer conter, LCD display circuit, storer, communication interface, ESAM interface, transformer electric energy meter ESAM module, output interface, power module, power management module and expansion interface, described current sampling circuit detects the electric current of three-phase electricity, the test side of voltage sampling circuit is connected with three-phase electricity, described current sampling circuit is all connected with the input end of described three-phase electrical energy computation chip with the output terminal of voltage sampling circuit, the output terminal of described three-phase electrical energy computation chip is electrically connected with described main process chip, the input end of described power module is connected with three-phase electricity, the output terminal of power module is electrically connected with power management module, described power management module is also electrically connected with power down reserve battery, described power management module is that transformer electric energy meter is powered, described timer conter, LCD display circuit, storer, communication interface, output interface and expansion interface are all electrically connected with described main process chip, and described transformer electric energy meter ESAM module is electrically connected with described main process chip by ESAM interface.
2. transformer electric energy meter according to claim 1, is characterized in that: described main process chip is STM32F100_VCT6 single-chip microcomputer, and described three-phase electrical energy computation chip is ADE7858 chip.
3. transformer electric energy meter according to claim 2, it is characterized in that: described output interface comprises the warning output interface circuit be connected with alarm and the on-load switch external interface circuit be connected with on-load switch, an input/output port of described main process chip is electrically connected with warning output interface circuit as alerting signal output pin, and another input/output port of described main process chip is electrically connected with on-load switch external interface circuit as on-load switch control signal output pin.
4. transformer electric energy meter according to claim 3, it is characterized in that: described warning output interface circuit comprises triode Q1, transient voltage suppression diode TVS1, electric capacity C36, electric capacity C37, electric capacity C38, voltage stabilizing diode D2, resistance R23, resistance R25, resistance R27 and relay K 1, the alerting signal output pin of described main process chip is by electric capacity C36 ground connection, the alerting signal output pin of described main process chip is connected with the base stage of triode Q1 by resistance R23, the alerting signal output pin of described main process chip is connected with the emitter of triode Q1 by resistance R25, the grounded emitter of described triode Q1, the collector of described triode Q1 is connected with the anode of voltage stabilizing diode D2, the negative electrode of described voltage stabilizing diode D2 is connected with the first end of resistance R27, second end of described resistance R27 is connected with the digital voltage output terminal of power management module, second end of described resistance R27 is by electric capacity C37 ground connection, the two ends of described voltage stabilizing diode D2 also with electric capacity C38, the coils from parallel connection of coils of transient voltage suppression diode TVS1 and relay K 1, the contact of described relay K 1 is single-pole double-throw (SPDT) contact, the contact of relay K 1 comprises relay K 1 moving contact, relay K 1 first stationary contact and relay K 1 second stationary contact, described relay K 1 first stationary contact is opening contact, described relay K 1 moving contact is connected with the common port of alarm, described relay K 1 second stationary contact is connected with the input end of described alarm.
5. transformer electric energy meter according to claim 3, it is characterized in that: described on-load switch external interface circuit comprises triode Q2, transient voltage suppression diode TVS2, electric capacity C39, electric capacity C40, electric capacity C41, voltage stabilizing diode D3, resistance R24, resistance R26, resistance R28 and relay K 2, the on-load switch control signal output pin of described main process chip is by electric capacity C40 ground connection, the on-load switch control signal output pin of described main process chip is connected with the base stage of triode Q2 by resistance R24, the on-load switch control signal output pin of described main process chip is connected with the emitter of triode Q2 by resistance R26, the grounded emitter of described triode Q2, the collector of described triode Q2 is connected with the anode of voltage stabilizing diode D3, the negative electrode of described voltage stabilizing diode D3 is connected with the first end of resistance R28, second end of described resistance R28 is connected with the digital voltage output terminal of power management module, second end of described resistance R28 is by electric capacity C40 ground connection, the two ends of described voltage stabilizing diode D3 also with electric capacity C41, the coils from parallel connection of coils of transient voltage suppression diode TVS2 and relay K 2, the contact of described relay K 2 is single-pole double-throw (SPDT) contact, the contact of relay K 2 comprises relay K 2 moving contact, relay K 2 first stationary contact and relay K 2 second stationary contact, described relay K 2 first stationary contact is connected with the disconnection input end of on-load switch, described relay K 2 second stationary contact is connected with the closed input end of on-load switch, described relay K 2 moving contact is connected with the described common port meeting switch.
6. a heat Balance Calculation alarm method for transformer electric energy meter, is applicable to transformer electric energy meter as claimed in claim 1, it is characterized in that: the heat Balance Calculation alarm method of described transformer electric energy meter comprises the following steps:
Step one: transformer electric energy meter electrification reset;
Step 2: system clock carries out reset processing;
Step 3: system peripheral equipment receives reset signal and carries out reset processing;
Step 4: recover normally to measure, transformer electric energy meter calculates instantaneous iron loss, instantaneous copper loss and current calorie value successively according to Information Monitoring;
Step 5: transformer electric energy meter is extrapolated the current aggregate-value of thermal equilibrium according to instantaneous iron loss, instantaneous copper loss and current calorie value and current for current thermal equilibrium aggregate-value and the threshold value manually set contrasted, the threshold value according to artificial setting provides corresponding control signal.
7. the heat Balance Calculation alarm method of transformer electric energy meter according to claim 6, is characterized in that: in step 4, and the active power of iron loss is LEF
w=G*V
2; Iron loss reactive power is LEF
var=B*V
2; Copper loss active power is LCD
w=R*I
2; Copper loss reactive power is LCD
var=X*I
2; Conductance G in formula, susceptance B resistance R and reactance X obtain by manual measurement and input in transformer electric energy meter;
Three-phase total losses are: iron loss general power of gaining merit is Δ W
fE=LFE
a,W+ LFE
b,W+ LFE
c,W, general power that iron loss is idle is Δ Var
fE=LFE
a, var+ LFE
b, var+ LFE
c, var, copper loss general power of gaining merit is Δ W
cU=LCU
a,W+ LCU
b,W+ LCU
c,Wgeneral power that copper loss is idle is Δ Var
cU=LCU
a, var+ LCU
b, var+ LCU
c, vartotal losses are Q=Δ W
fE+ Δ W
cU+ Δ Var
fE+ Δ Var
cU.
8. the heat Balance Calculation alarm method of transformer electric energy meter according to claim 7, is characterized in that: in described step 5, the current heat produced when adopting radiating surface area method calculating transformer to run: Δ T=Q/ α * A
t
α is transformer coefficient of heat transfer, A
tfor transformer surface radiating area, thermal equilibrium cumulative data is
wherein, K is transformer temperature rise coefficient.
9. the heat Balance Calculation alarm method of transformer electric energy meter according to claim 8, is characterized in that: described K data is by full-load test data acquisition.
10. the heat Balance Calculation alarm method of transformer electric energy meter according to claim 8, it is characterized in that: S11 series 10kV, rated capacity 100KVA, low pressure 0.4KV, at cos=0.9, when A type insulating transformer in environment temperature 25 degree of situations is in rated capacity situation, according to Road test result and temperature rise test result at full capacity, by formula Δ T=Q/ μ, draw μ=Q/ Δ T, show that transformer coefficient of heat transfer is 59.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133338A (en) * | 2019-05-16 | 2019-08-16 | 国网重庆市电力公司电力科学研究院 | A kind of twin-core electric energy meter and display methods |
| CN114325085A (en) * | 2021-12-30 | 2022-04-12 | 江苏林洋能源股份有限公司 | Electric energy meter and method supporting dynamic energy consumption management |
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| CN114325085A (en) * | 2021-12-30 | 2022-04-12 | 江苏林洋能源股份有限公司 | Electric energy meter and method supporting dynamic energy consumption management |
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| CN104330619B (en) | 2016-01-20 |
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