CN104880591B - TV broken string electric energy metricals recollect device - Google Patents
TV broken string electric energy metricals recollect device Download PDFInfo
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Abstract
TV broken string electric energy metricals recollect device, it is related to electric energy metrical field, solve due to TV broken strings etc. caused by reason electric power meter collection voltages decompression cause that the electricity in this period can not measure and the decompression time can not accurately calculate, the problem of so as to cause certain economic loss.The device includes two transformers, and relay, respectively by four diodes, two bridge rectifiers parallel with one another formed, two circuit of three-terminal voltage-stabilizing integrated, backup DC power source, glisten sound equipment, count information device, two triodes, three resistance and six electric capacity.The present invention recollects circuit by recollecting inference technology design, on the premise of transformer station's normal operation is not influenceed, the electricity of few meter can accurately be remedied, there is the characteristics of safe, succinct, efficient, it is possible to prevente effectively from electric quantity loss, so as to largely reduce economic loss.
Description
Technical field
The present invention relates to Electric Energy Metering Technology field, and in particular to TV broken string electric energy metricals recollect device, are a kind of TV (electricity
Pressure transformer) broken string etc. bus non-faulting electric energy acquisition decompression when metering recollect device.
Background technology
The electrical equipment such as the connection of voltage power distribution equipments at different levels and transformer and corresponding power distribution equipment in transformer station
Connection, mostly using rectangle or the bare conductor or twisted wire of circular cross-section, this is referred to as bus, and bus is that transformer station's conveying electric energy is used
Total wire.Bus is typically made of copper, the aluminum material of high conductivity, to collect, distribute and transmit electric energy.Pass through mother
The electrical energy transportation that line exports generator, transformer or rectifier gives each user or other electric substations, electric energy meter 12 and power transformation
Bus-bar potential transformer 13 stand by connecing element on substation bus bar.
The reason for substation bus bar has a power failure typically has：Element (such as substation bus bar electricity is connect in bus failure itself, bus
Pressure transformer 13 etc.) failure, protection or switch failure, external power source full cut-off cause.Whether substation bus bar breaks down, and needs
To be indicated, protected and automatics action situation, switching signal and accident phenomenon (such as flame, explosive sound) etc. are entered according to instrument
Row judges accident conditions, and adopts an effective measure rapidly.
When due to substation bus bar TV (voltage transformer) broken string etc. reason cause bus non-faulting Non voltage output when, by
In electric power meter decompression, it can cause that the electricity in this period can not measure and the time of decompression can not accurately calculate, to change
The economical operation in power station and Controlling line loss bring influence, cause certain economic loss.Therefore, there is an urgent need to develop one kind to exist
Electric energy metrical and the device recollected are carried out when TV (voltage transformer) breaks.
The content of the invention
In order to effectively solve when electric power meter collection voltages decompression causes this caused by the reasons such as TV broken strings
The electricity of phase can not measure and the decompression time can not accurately calculate, and the problem of so as to cause certain economic loss, the present invention carries
Recollect device for a kind of TV broken string electric energy metricals.
The present invention is that technical scheme is as follows used by solving technical problem：
A kind of TV broken strings electric energy metrical provided by the invention recollects device, including：Become with the first of 220V power electric connections
Depressor, the second transformer being connected with electrical energy meter electricity, relay, formed by the first diode~the 4th diode is parallel with one another
First bridge rectifier, by the 5th diode~the 8th diode the second bridge rectifier parallel with one another formed, first
Circuit of three-terminal voltage-stabilizing integrated, the second circuit of three-terminal voltage-stabilizing integrated, backup DC power source, glisten sound equipment, count information device, and the one or three
Pole pipe, the second triode, first resistor~3rd resistor, the electric capacity of the first electric capacity~the 6th, the 9th diode；
First bridge rectifier, the first electric capacity, the second electric capacity are in parallel successively, the second electric capacity both ends respectively with
First circuit of three-terminal voltage-stabilizing integrated input and earth terminal electrical connection, the 3rd electric capacity both ends respectively with the first three-terminal voltage-stabilizing
Earth terminal and the output end electrical connection of integrated circuit, the 3rd electric capacity both ends also respectively with the switch terminals of backup DC power source with
Power supply bears the electrical connection of level end；
Second bridge rectifier, the 4th electric capacity, the 5th electric capacity are in parallel successively, the 5th electric capacity both ends respectively with
Second circuit of three-terminal voltage-stabilizing integrated input and earth terminal electrical connection, the 6th electric capacity both ends respectively with the second three-terminal voltage-stabilizing
Earth terminal and the output end electrical connection of integrated circuit；
Described second resistance one end electrically connects with the output end of the second circuit of three-terminal voltage-stabilizing integrated, and the second resistance is another
End electrically connects with the base stage of the first triode；Described 3rd resistor one end and the output end of the first circuit of three-terminal voltage-stabilizing integrated are electrically connected
Connect, the 3rd resistor other end electrically connects with the emitter stage of the first triode；First resistor one end and the emitter stage of the first triode
Electrical connection, the first resistor other end electrically connect with the base stage of the second triode；
The relay and the 9th diodes in parallel, coil one end of the relay and the emitter stage electricity of the second triode
Connection, the coil other end of the relay electrically connect with the input of the first circuit of three-terminal voltage-stabilizing integrated；The relay
The input of section point and the 3rd node one end with the first circuit of three-terminal voltage-stabilizing integrated electrically connects, the other end of section point
Electrically connected with flash of light sound equipment, the other end of the 3rd node electrically connects with count information device；The first node of the relay is set
Between substation bus bar voltage transformer and electric energy meter.
Further, first transformer is by the 220V voltage step-downs that 220V power supplys export to 7.5V alternating currents, successively
It is direct current through the first bridge rectifier rectification, is 5V DC voltages through the output of the first circuit of three-terminal voltage-stabilizing integrated, works as 220V
During power outage, the switch closure of backup DC power source is its power supply, and guarantee has working power all the time.
Further, when substation bus bar voltage transformer voltage is normal, the electric energy meter voltage input end is 100V
Voltage, the second output voltage of transformer one time are 100V, and secondary output voltage is 7.5V, whole through the second bridge rectifier successively
Flow for 7.5V DC voltages, the 5V DC voltages through the output of the second circuit of three-terminal voltage-stabilizing integrated for stabilization, now the first triode
Base stage be high potential, the first triode saturation conduction, the base stage for causing the second triode is low potential, and the second triode is cut
Only, relay coil both sides voltage is identical does not have electric current by the way that three nodes of relay are in off-state, power transformation
Stand the voltage not inputing power table of bus-bar potential transformer, now, electric energy meter is normal operating conditions, flash of light sound equipment do not work and
Do not flash and audible alarm, count information device does not work and not-time.
Further, it is described when substation bus bar voltage transformer disconnection causes electric energy meter voltage input end decompression, the
Output voltage of two transformers and secondary output voltage are 0, and the output of the second circuit of three-terminal voltage-stabilizing integrated is 0, now,
The base stage of first triode is low potential, and the first triode is in cut-off state, and the base stage of the second triode is high potential, the
For two triode operations in saturation conduction state, relay coil has electric current to pass through the first node closure of relay, by transformer station
The control source of bus-bar potential transformer makes electric energy meter continue gage work, the section point closure of relay makes to electric energy meter
Flash of light sound equipment flashes to be alerted with sound equipment to operations staff, the 3rd node of relay closure start count information device start into
Row decompression timing, so that operations staff transfers the decompression time at any time.
Further, the relay model：JZX-12 types.
Further, first circuit of three-terminal voltage-stabilizing integrated and the second circuit of three-terminal voltage-stabilizing integrated are defeated using positive voltage
7805 series gone out.
Further, the resistance of the first resistor is 3k Ω, the resistance of second resistance is 3k Ω, the resistance of 3rd resistor
For 1k Ω.
Further, the capacitance of first electric capacity is 1000pF, the capacitance of the second electric capacity is 220 μ F, the 3rd electricity
The capacitance of appearance is 220 μ F, the capacitance of the 4th electric capacity is 1000pF, the capacitance of the 5th electric capacity is 220 μ F, the 6th electric capacity
Capacitance is 220 μ F.
Further, first triode and the second triode are NPN type triode, model：C1815；It is described
First diode, the second diode, the 3rd diode, the model of the 4th diode are：1N4007；5th diode,
6th diode, the 7th diode, the 8th diode, the model of the 9th diode are：4148.
Further, first transformer voltage ratio is 220/7.5V；Second transformer voltage ratio is 100/7.5V.
The beneficial effects of the invention are as follows：Electric energy metrical recollects device during the TV broken strings of the present invention, by recollecting inference technology
Design recollect circuit, on the premise of transformer station's normal operation is not influenceed, the electricity of few meter can accurately be remedied, have safety,
Succinctly, the characteristics of efficient.Electric energy metrical recollects device and substation bus bar voltage transformer is broken when being broken using the TV of the present invention
Bus collection decompression electric energy caused by the reasons such as line, which carries out metering, to be recollected, it is possible to prevente effectively from electric quantity loss, so as in very great Cheng
Economic loss is reduced on degree.
Brief description of the drawings
Fig. 1 is that the TV broken string electric energy metricals of the present invention recollect the structural representation of device.
In figure：1st, the first transformer, the 2, second transformer, 3, relay, the 4, first bridge rectifier, the 5, second bridge-type
Rectification circuit, the 6, first circuit of three-terminal voltage-stabilizing integrated, the 7, second circuit of three-terminal voltage-stabilizing integrated, 8, backup DC power source, 9, flash of light
Sound equipment, 10, count information device, 11,220V power supplys, 12, electric energy meter, 13, substation bus bar voltage transformer, VT1, the one or three pole
Pipe, VT2, the second triode, R1~R3, first resistor~3rd resistor, the electric capacity of C1~C6, the first electric capacity~the 6th, D1~D9,
The diode of first diode~the 9th.
Embodiment
The present invention is described in further details below in conjunction with accompanying drawing.
As shown in figure 1, electric energy meter 12 and substation bus bar voltage transformer 13 on substation bus bar by connecing element.This hair
Bright TV broken string electric energy metricals recollect device, mainly by circuit realiration, including：First transformer 1, the second transformer 2, relay
Device 3, the first bridge rectifier 4, the second bridge rectifier 5, the first circuit of three-terminal voltage-stabilizing integrated 6, the second three-terminal voltage-stabilizing collection
Into circuit 7, backup DC power source 8, flash of light sound equipment 9, count information device 10, the first triode VT1, the second triode VT2, first
The electric capacity C6 of resistance R1, second resistance R2,3rd resistor R3, the first electric capacity C1~the 6th, the 9th diode D9.
First bridge rectifier 4 is by the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode
D4 compositions parallel with one another；Second bridge rectifier 5 is by the 5th diode D5, the 6th diode D6, the 7th diode D7, the 8th
Diode D8 compositions parallel with one another.
First transformer 1 electrically connects with existing 220V power supplys 11, the first bridge rectifier 4, the first electric capacity C1, second
Electric capacity C2 is connected in parallel successively, the second electric capacity C2 both ends respectively with the input 61 of the first circuit of three-terminal voltage-stabilizing integrated 6 and ground connection
The electrical connection of end 62, the 3rd electric capacity C3 both ends are electrically connected with the earth terminal 6 and output end 63 of the first circuit of three-terminal voltage-stabilizing integrated 6 respectively
Connect, the 3rd electric capacity C3 both ends are also born level end with power supply with the switch terminals of backup DC power source 8 respectively and electrically connected.
Second transformer 2 electrically connects with the electric energy meter 12 on substation bus bar, the second bridge rectifier 5, the 4th electric capacity
C4, the 5th electric capacity C5 are connected in parallel successively, the 5th electric capacity C5 both ends input 71 with the second circuit of three-terminal voltage-stabilizing integrated 7 respectively
Electrically connected with earth terminal 72, the 6th electric capacity C6 both ends earth terminal 72 and output end with the second circuit of three-terminal voltage-stabilizing integrated 7 respectively
73 electrical connections.
Second resistance R2 one end electrically connects with the output end 73 of the second circuit of three-terminal voltage-stabilizing integrated 7, and second resistance R2 is another
End electrically connects with the first triode VT1 base stage；3rd resistor R3 one end and the output end 63 of the first circuit of three-terminal voltage-stabilizing integrated 6
Electrical connection, the 3rd resistor R3 other ends electrically connect with the first triode VT1 emitter stage；First resistor R1 one end and the one or three pole
Pipe VT1 emitter stage electrical connection, the first resistor R1 other ends electrically connect with the second triode VT2 base stage.
Relay 3 is in parallel with the 9th diode D9, coil one end of relay 3 and the second triode VT2 emitter stage electricity
Connection, the coil other end of relay 3 electrically connect with the input 61 of the first circuit of three-terminal voltage-stabilizing integrated 6；The second of relay 3
The input 61 of node J02, the 3rd node J03 one end with the first circuit of three-terminal voltage-stabilizing integrated 6 electrically connects, section point J02
The other end electrically connects with flash of light sound equipment 9, and the 3rd node J03 other ends electrically connect with count information device 10.
Substation bus bar voltage transformer 13 on substation bus bar electrically connects with electric energy meter 12, and substation bus bar voltage is mutual
The first node J01 of relay 3 is additionally provided between sensor 13 and electric energy meter 12.
The TV broken string electric energy metricals of the present invention recollect device, non-for bus after breaking to transformer station TV (voltage transformer)
Bus loss of pressure electric energy metrical during failure Non voltage output, electric energy meter 12 will continue normal metering electricity, while act on flash of light
The alarm notification operations staff of sound equipment 9, and remember the time of decompression, to transfer at any time.
First transformer 1 by the 220V voltage step-downs that 220V power supplys 11 export to 7.5V alternating currents, successively by the first bridge
The rectification of formula rectification circuit 4 is direct current, is stable 5V DC voltages by the output of the first circuit of three-terminal voltage-stabilizing integrated 6, works as change
When 220V power supplys 11 have a power failure in power station, the switch K closures of backup DC power source 8 are its power supply, and guarantee has working power all the time.
When the voltage of substation bus bar voltage transformer 13 is normal, the voltage input end of electric energy meter 12 is 100V voltages, second
2 output voltages of transformer are 100V, and secondary output voltage is 7.5V, is by the rectification of the second bridge rectifier 5 successively
7.5V DC voltages, it is stable 5V DC voltages to be exported by the second circuit of three-terminal voltage-stabilizing integrated 7, now the first triode
VT1 base stage is high potential, the first triode VT1 saturation conductions, and the base stage for causing the second triode VT2 is low potential, second
Triode VT2 ends, the coil both sides voltage of relay 3 it is identical without electric current by, three node J01, J02 of relay 3,
J03 is in off-state, and the voltage of substation bus bar voltage transformer 13 not inputing power table 12, now, electric energy meter 12 is
Normal operating conditions, flash of light sound equipment 9 do not work and not flashed and audible alarm, count information device 10 do not work and disregarded
When.
When the broken string of substation bus bar voltage transformer 13 causes 12 voltage input end decompression of electric energy meter, the second transformer 2
An output voltage and secondary output voltage be 0, the output of the second circuit of three-terminal voltage-stabilizing integrated 7 is 0, now, the one or three
Pole pipe VT1 base stage is low potential, and the first triode VT1 is in cut-off state, and the second triode VT2 base stage is high electricity
Position, the second triode VT2 work in saturation conduction state, and the coil of relay 3 has electric current to pass through the first node J01 of relay 3
Closure, by the control source of substation bus bar voltage transformer 13 to electric energy meter 12, electric energy meter 12 is set to continue gage work, relay
Device 3 section point J02 closure make flash of light sound equipment 9 flash with sound equipment to operations staff alert, the 3rd node of relay 3
J03 closures start count information device 10 and proceed by decompression timing, so that operations staff transfers the decompression time at any time.
In present embodiment, the described model of relay 3：JZX-12 types.
In present embodiment, the first described circuit of three-terminal voltage-stabilizing integrated 6 and the second circuit of three-terminal voltage-stabilizing integrated 7 use
7805 series of positive voltage output.
In present embodiment, described first resistor R1 resistance is 3k Ω, second resistance R2 resistance is 3k Ω, the 3rd
Resistance R3 resistance is 1k Ω.
In present embodiment, the capacitance of the first described electric capacity C1 is 1000pF, the second electric capacity C2 capacitance is 220
μ F, the 3rd electric capacity C3 capacitance are 220 μ F, the 4th electric capacity C4 capacitance is 1000pF, the 5th electric capacity C5 capacitance is
220 μ F, the 6th electric capacity C6 capacitance are 220 μ F.
In present embodiment, the first described triode VT1 and the second triode VT2 are NPN type triode, and model is equal
For：C1815.
In present embodiment, the first described diode D1, the second diode D2, the 3rd diode D3, the 4th diode
D4 model is：1N4007；Described the 5th diode D5, the 6th diode D6, the 7th diode D7, the 8th diode
D8, the 9th diode D9 model are：4148.
In present embodiment, the described no-load voltage ratio of the first transformer 1 is 220/7.5V；The described no-load voltage ratio of the second transformer 2 is
100/7.5V。
Claims (10)
1.TV broken string electric energy metricals recollect device, it is characterised in that including：The first transformer electrically connected with 220V power supplys (11)
(1) the second transformer (2), electrically connected with electric energy meter (12), relay (3), by the first diode (D1)~the 4th diode
(D4) the first bridge rectifier (4) of composition parallel with one another, by the 5th diode (D5)~the 8th diode (D8) mutually simultaneously
The second bridge rectifier (5) of connection composition, the first circuit of three-terminal voltage-stabilizing integrated (6), the second circuit of three-terminal voltage-stabilizing integrated (7),
Backup DC power source (8), flash of light sound equipment (9), count information device (10), the first triode (VT1), the second triode (VT2), the
One resistance (R1)~3rd resistor (R3), the first electric capacity (C1)~the 6th electric capacity (C6), the 9th diode (D9)；
First bridge rectifier (4), the first electric capacity (C1), the second electric capacity (C2) are in parallel successively, second electric capacity
(C2) both ends electrically connect with the input (61) and earth terminal (62) of the first circuit of three-terminal voltage-stabilizing integrated (6) respectively, and the described 3rd
Electric capacity (C3) both ends electrically connect with the earth terminal (62) and output end (63) of the first circuit of three-terminal voltage-stabilizing integrated (6) respectively, described
Also bear level end with power supply with the switch terminals of backup DC power source (8) respectively and electrically connect in 3rd electric capacity (C3) both ends；
Second bridge rectifier (5), the 4th electric capacity (C4), the 5th electric capacity (C5) are in parallel successively, the 5th electric capacity
(C5) both ends electrically connect with the input (71) and earth terminal (72) of the second circuit of three-terminal voltage-stabilizing integrated (7) respectively, and the described 6th
Electric capacity (C6) both ends electrically connect with the earth terminal (72) and output end (73) of the second circuit of three-terminal voltage-stabilizing integrated (7) respectively；
Described second resistance (R2) one end electrically connects with the output end (73) of the second circuit of three-terminal voltage-stabilizing integrated (7), and described second
Resistance (R2) other end electrically connects with the base stage of the first triode (VT1)；Described 3rd resistor (R3) one end and the one or three end are steady
Press the emitter stage electricity of output end (63) electrical connection of integrated circuit (6), 3rd resistor (R3) other end and the first triode (VT1)
Connection；First resistor (R1) one end electrically connects with the emitter stage of the first triode (VT1), first resistor (R1) other end and second
The base stage electrical connection of triode (VT2)；
The relay (3) is in parallel with the 9th diode (D9), coil one end and the second triode of the relay (3)
(VT2) emitter stage electrical connection, the input of the coil other end and the first circuit of three-terminal voltage-stabilizing integrated (6) of the relay (3)
Hold (61) electrical connection；The section point (J02) of the relay (3), the 3rd node (J03) one end with the first three-terminal voltage-stabilizing collection
Input (61) into circuit (6) electrically connects, and section point (J02) other end electrically connects with flash of light sound equipment (9), the 3rd node
(J03) other end electrically connects with count information device (10)；The first node (J01) of the relay (3) is arranged on transformer station mother
Between line voltage transformer (13) and electric energy meter (12).
2. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that first transformer (1)
By the 220V voltage step-downs of 220V power supplys (11) output to 7.5V alternating currents, it is through the first bridge rectifier (4) rectification successively
Direct current, it is 5V DC voltages through the first circuit of three-terminal voltage-stabilizing integrated (6) output, it is standby straight when 220V power supplys (11) have a power failure
Switch (K) closure for flowing power supply (8) has working power all the time for its power supply, guarantee.
3. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that when substation bus bar voltage is mutual
When sensor (13) voltage is normal, electric energy meter (12) voltage input end is 100V voltages, and the second transformer (2) once exports electricity
It is 7.5V to press as 100V, secondary output voltage, is successively 7.5V DC voltages through the second bridge rectifier (5) rectification, through
Two circuit of three-terminal voltage-stabilizing integrated (7) output is stable 5V DC voltages, and now the base stage of the first triode (VT1) is high electricity
Position, the first triode (VT1) saturation conduction, the base stage for causing the second triode (VT2) are low potential, the second triode (VT2)
Cut-off, relay (3) coil both sides voltage it is identical without electric current by three nodes of, relay (3) (J01, J02,
J03) it is off, the voltage of substation bus bar voltage transformer (13) not inputing power table (12), now, electric energy meter
(12) it is normal operating conditions, flash of light sound equipment (9) does not work and do not flashed and audible alarm, count information device (10) not work
Make and not-time.
4. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that when substation bus bar voltage is mutual
Sensor (13) broken string is when causing electric energy meter (12) voltage input end decompression, an output voltage of the second transformer (2) and secondary
Output voltage is 0, and the output of the second circuit of three-terminal voltage-stabilizing integrated (7) is 0, and now, the base stage of the first triode (VT1) is low
Current potential, the first triode (VT1) is in cut-off state, and the base stage of the second triode (VT2) is high potential, the second triode
(VT2) saturation conduction state is worked in, relay (3) coil has electric current by, first node (J01) closure of relay (3),
By the control source of substation bus bar voltage transformer (13) to electric energy meter (12), electric energy meter (12) is set to continue gage work, after
Electrical equipment (3) section point (J02) closure make flash of light sound equipment (9) flash with sound equipment to operations staff alert, relay (3)
The 3rd node (J03) closure start count information device (10) proceed by decompression timing, so that operations staff transfers mistake at any time
Press the time.
5. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that relay (3) model
For：JZX-12 types.
6. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that the first three-terminal voltage-stabilizing collection
Into circuit (6) and the second circuit of three-terminal voltage-stabilizing integrated (7) using 7805 series of positive voltage output.
7. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that the first resistor (R1)
Resistance is 3k Ω, the resistance of second resistance (R2) is 3k Ω, the resistance of 3rd resistor (R3) is 1k Ω.
8. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that first electric capacity (C1)
Capacitance is 1000pF, the capacitance of the second electric capacity (C2) is 220 μ F, the capacitance of the 3rd electric capacity (C3) is 220 μ F, the 4th electricity
The capacitance for holding (C4) is 1000pF, the capacitance of the 5th electric capacity (C5) is 220 μ F, the capacitance of the 6th electric capacity (C6) is 220 μ
F。
9. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that first triode
(VT1) and the second triode (VT2) is NPN type triode, model：C1815；First diode (D1), the two or two
Pole pipe (D2), the 3rd diode (D3), the model of the 4th diode (D4) are：1N4007；5th diode (D5),
Six diodes (D6), the 7th diode (D7), the 8th diode (D8), the model of the 9th diode (D9) are：4148.
10. TV broken strings electric energy metrical according to claim 1 recollects device, it is characterised in that first transformer (1)
No-load voltage ratio is 220/7.5V；Second transformer (2) no-load voltage ratio is 100/7.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510344680.3A CN104880591B (en) | 2015-06-19 | 2015-06-19 | TV broken string electric energy metricals recollect device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510344680.3A CN104880591B (en) | 2015-06-19 | 2015-06-19 | TV broken string electric energy metricals recollect device |
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| Publication Number | Publication Date |
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| CN104880591A CN104880591A (en) | 2015-09-02 |
| CN104880591B true CN104880591B (en) | 2018-01-09 |
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| Title |
|---|
| 电压互感器二次回路断线对继电保护装置的影响;顾祥和 等;《江苏电机工程》;20000630;第19卷(第2期);第38-39页 * |
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| Publication number | Publication date |
|---|---|
| CN104880591A (en) | 2015-09-02 |
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