CN2205600Y - Multifunction protector for electric transformer - Google Patents
Multifunction protector for electric transformer Download PDFInfo
- Publication number
- CN2205600Y CN2205600Y CN 94215762 CN94215762U CN2205600Y CN 2205600 Y CN2205600 Y CN 2205600Y CN 94215762 CN94215762 CN 94215762 CN 94215762 U CN94215762 U CN 94215762U CN 2205600 Y CN2205600 Y CN 2205600Y
- Authority
- CN
- China
- Prior art keywords
- phase
- links
- diode
- voltage
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a multifunction protector for an electric transformer. The utility model has the advantages of low cost, reliable performance, simple structure and convenient operation. The utility model is composed of a phase sample taking phase interruption protection circuit, a phase sample taking overvoltage protection line, a temperature sample taking overload protection circuit, a zero sequence current sample taking protection circuit for seriously unbalanced three-phase voltage, a phase sample taking uninterrupted power supply circuit and an output circuit.
Description
The utility model is multi-function protectors such as a kind of primary and secondary phase failure that relates to power transformer, overvoltage, overload, the serious imbalance of three-phase voltage.
The existing power transformer burnout failure occurs easily owing to lack reliable protective measure such as the primary and secondary phase failure, overvoltage, overload, the serious imbalance of three-phase voltage in the use.
The purpose of this utility model provides that a kind of cost is low, dependable performance, the serious unbalance protection device of the primary and secondary phase failure of power transformer, overvoltage, overload, three-phase voltage simple in structure, easy to use.
Advantage of the present utility model is: 1, adopt multiple phase failure detection means, guarantee that open phase protection is reliable.2, adopt temperature sampling detection means, make overload protection safety timely.3, adopt the current sampling detection means, when serious imbalance appears in three-phase voltage, power transformer is effectively protected.4, the protector power supply adopts the phase-samplomh detection means, makes the normal operation of this protector more reliable.5, the utility model circuit has modular construction, is convenient to machine debugging.6, the utility model circuit mechanism is simple, cost is low, is convenient to popularize.
Fig. 1 is the utility model schematic block circuit diagram.
Fig. 2 a, b, c, d, e, f are the utility model circuit theory exploded views.
Fig. 3 is Fig. 2 a, b, c, d, e, f location diagram.
Referring to Fig. 1: the utility model is made up of phase-samplomh open-phase protection circuit, phase-samplomh overvoltage crowbar, temperature sampling overload protecting circuit, the serious unbalance protection circuit of zero-sequence current sampling three-phase voltage, phase-samplomh uninterrupted power supply circuit and output circuit.
The phase-samplomh open-phase protection circuit, in the described phase-samplomh open-phase protection circuit, the end of the same name of phase transformer BA1, BA2, elementary three marks of BA3 " " symbol links to each other; The end of the same name of three unmarked " " symbols links to each other with A, B, C three-phase respectively; Secondary LA1, LA2, LA3 different name end are connected.LA1 unmarked " " symbol terminal link to each other through diode BGA1, resistance R A1, RA2 series arm and the comparator inverting input formed by integrated operational amplifier ICA; The phase-samplomh overvoltage crowbar, in the described phase-samplomh overvoltage crowbar, the end of the same name of phase transformer BE1, BE2, elementary three marks of BE3 " " symbol links to each other, and the end of the same name of three unmarked " " symbols is connected with A, B, C three respectively; The terminal of unmarked " " symbol of secondary LE1 links to each other through diode BGB1, resistance R B1, RB2 series arm and the comparator in-phase input end be made up of integrated operational amplifier ICB.
Temperature sampling overload protecting circuit, in the described temperature sampling overload protecting circuit, potentiometer RWC1 travelling arm end links to each other with π formula filter capacitor CG1 anode, and RCW1 one end and thermistor RC1 one end are connected in the C point, RC1 other end ground connection.Dividing point C links to each other with the comparator inverting input of being made up of integrated operational amplifier ICC by resistance R C2.
The zero-sequence current sampling; the serious unbalance protection circuit of three-phase voltage; described zero-sequence current sampling; in the serious unbalance protection circuit of three-phase voltage; ring-like AC converter LDA is enclosed within on the secondary neutral line of power transformer as elementary, and LDA arbitrary end of level links to each other through diode BGD1, resistance R D1, RD2 series arm and the voltage comparator in-phase input end be made up of integrated operational amplifier ICD.
Integrated operational amplifier ICA, the ICB of the above each protective circuit, ICC, ICD output all are made up of two branch roads: a branch road links to each other with the base stage of triode BGF1 through resistance R A6, RB6, RC5, RD6 and diode BGA2, BGB2, BGC1, BGD2 respectively, and the collector electrode of BGF1 links to each other with relay J 1, diode BGE2 parallel branch; Another branch road links to each other with light-emitting diode BGA4, BGB4, BGC3, BGD4 anode through diode BGA3, BGB3, BGC2, BGD3 respectively, and the negative electrode of light-emitting diode all connects carries out pipe BGF1 collector electrode.
It also comprises a phase-samplomh uninterrupted power supply circuit the utility model, and in the described phase-samplomh uninterrupted power supply circuit, the end of the same name of phase transformer BE1, BE2, elementary three marks of BE3 " " symbol links to each other; The end of the same name of three unmarked " " symbols is connected with A, B, C three respectively.The secondary LE2 two ends of BE2 link to each other with bridge rectifier Q1 input respectively, and the output of Q1 links to each other with three end integrated stable voltage circuit ICE1 inputs, the output of ICE1 be connected in parallel by relay J 2 and diode BGE2, form the uninterrupted power supply change-over circuit.Bridge rectifier Q2 input is made up of two branch roads: one continuous through relay normally open point J2-1, J2-2 respectively by the non-earth terminal of LE3, LE4; Another is linked to each other through relay normally closed some J2-1, J2-2 respectively by the non-earth terminal of LE5, LE6.The Q2 output links to each other with three end integrated stable voltage circuit ICE2, ICE3 input respectively, and diode BGE3, BGE4 are connected in parallel with three end integrated stable voltage circuit ICE2, the input of ICE3, output respectively simultaneously.The output of ICE2 links to each other minus earth through resistance R E1, diode BGE5 with light-emitting diode BGE6 anode.
Referring to Fig. 2 a, be the utility model phase-samplomh open-phase protection circuit schematic diagram, the end of the same name of phase transformer BA1, BA2, elementary three marks of BA3 " " symbol links to each other among the figure; The end of the same name of three unmarked " " symbols links to each other with A, B, C three-phase respectively.Secondary LA1, LA2, LA3 different name end link to each other.When power transformer normally moves, with the secondary phase transformer BA1 that links to each other, BA2, BA3 are elementary all has electric current to pass through; Predefined 11 volts of alternating voltages are all responded at the two ends of secondary LA1, LA2, LA3.At this moment, the different name terminal two ends of LA1 and LA3 are responded to the vector of total voltage and are 13 volts of alternating voltages.This alternating voltage is behind diode BGA1, capacitor C A1, CA2 rectifying and wave-filtering, the direct voltage that produces obtains 17 volts of d. c. voltage signals at the A point after resistance R A1 dividing potential drop, RA2 current limliting, this voltage signal is input to integrated operational amplifier ICA inverting input by resistance R A3, (RE5 is the integrated operational amplifier negative feedback resistor as reference voltage, RA5 is the multiplication factor of integrated operational amplifier than RA3, and other effect is identical).And the predefined voltage of in-phase input end is 9 volts.This setting voltage, is adjusted potentiometer RWA dividing potential drop and is obtained after capacitor C E6, CE7, CG1 and the filtering of resistance R G1 π formula by the output of three end integrated regulated power supply ICE2.Integrated operational amplifier ICA is a desirable voltage comparator, and its inverting input reference voltage is higher than 8 volts of the predefined voltages of in-phase input end, causes operational amplifier ICA output negative level, and carrying out pipe BGF1 base voltage is zero volt, is in cut-off state; Relay J 1 suction coil does not have electric current to pass through as the load of BGF1, and its normally closed some J1-1 is in normally off.Because normally closed some J1-1 of relay is serially connected in the wire loop of power transformer magnetic switch and goes, its normally closed some J1-1 is in normally off, and the suction coil of magnetic switch still has electric current to pass through, and magnetic switch is not threaded off.Power transformer normally moves.
When arbitrary when mutually the phase failure taking place in the elementary or secondary A of power transformer, B, the C three-phase, corresponding phase transformer BA1～BA3 is primary and secondary also to lack a phase place, this moment LA1 and LA3 different name end institute induced voltage vector and be zero volt.Integrated operational amplifier ICA inverting input A point reference voltage also is zero volt, at this moment in-phase input end is in high potential, cause integrated operational amplifier ICA to export positive high level, through resistance R A6 current limliting, diode BGA2 forward conduction, through capacitor C F1 buffering, make the collector current of carrying out pipe reach maximum simultaneously, be saturation condition.The suction coil of carrying out pipe BGF1 load-relay J1 produces magnetic field and adhesive, and normally closed some J1-1 disconnects simultaneously, cut off the power supply of the magnetic switch suction coil of power transformer, causes magnetic switch to be threaded off, and reaches the purpose of protection power transformer and load thereof.Because integrated operational amplifier ICA exports positive high level, diode BGA3, light-emitting diode BGA4 conducting, BGA4 is luminous to provide demonstration as open phase fault.
Referring to Fig. 2 b: show the utility model phase-samplomh overvoltage crowbar schematic diagram.The end of the same name of phase transformer BE1, BE2, elementary three marks of BE3 " " symbol links to each other among the figure, and the end of the same name of three unmarked " " symbols is connected with A, B, C three respectively.
When power transformer normally moves, phase transformer BE1, BE2, BE3 is elementary all has electric current to pass through, the coil two ends of secondary LE1 induce 2 volts of alternating voltages, direct voltage through producing behind diode BGB1, capacitor C B1, the CB2 rectifying and wave-filtering obtains 3 volts of voltage signals at the B point again after resistance R B1 dividing potential drop, RB2 current limliting, this voltage signal is added to the in-phase input end of integrated operational amplifier ICB by RB4; The predefined reference voltage of inverting input is 5 volts and (presses power transformer operating standard regulation, internal overvoltage must not surpass 2.5 times of rated voltage and sets), this voltage is exported by three end integrated stable voltage circuit ICE2, and after capacitor C E6, CE7, CG1 and the filtering of resistance R G1 π formula, adjust potentiometer RWB dividing potential drop again and obtain.Integrated operational amplifier ICB inverting input reference voltage is higher than in-phase input end voltage.Cause integrated operational amplifier ICB output negative level, carrying out pipe BGF1 base voltage is zero volt, is in cut-off state.As not having electric current to pass through in the relay J 1 suction coil of carrying out pipe BGF1 load, normally closed some J1-1 still is in normally off, because normally closed some J1-1 of relay is serially connected in the wire loop of power transformer magnetic switch, its normally closed some J1-1 still is in normally off, the coil of magnetic switch still has electric current to pass through, magnetic switch is not threaded off, and power transformer normally moves.Because the people is misoperation, cause that the primary and secondary voltage of corresponding phase transformer BE1, BE2, BE3 raise relatively when internal overvoltage reached 2.5 times of power transformer rated voltages with an interior numerical value when electric administrative department.The alternating voltage that secondary LE1 is responded at two ends is elevated to 5 volts by 2 volts.The direct current signal that these 5 volts of alternating voltages produce behind diode BGB1, capacitor C B1, CB2 rectifying and wave-filtering, after resistance R B1 dividing potential drop and RB2 current limliting, obtain 7 volts of direct voltages again, then this voltage signal is added to the in-phase input end of integrated operational amplifier ICB through resistance R B4 at the B point.This moment, in-phase input end voltage was higher than 2 volts of anti-phase reference voltages, cause integrated operational amplifier ICB to export positive high level, through resistance R B6 current limliting, diode BGB2 conducting and capacitor C F1 buffering, the collector current of carrying out pipe BGF1 reaches maximum, is saturation condition.Produce magnetic field and adhesive as the relay J 1 suction coil of BGF1 load, normally closed some J1-1 disconnects, and cut off the suction coil power in the magnetic switch of power transformer, and magnetic switch is threaded off, and reached the purpose of protection power transformer and load thereof.Simultaneously, diode BGB3, light-emitting diode BGB4 conducting, BGB4 provides light signal, shows as the overvoltage fault.
Referring to 2c: show the utility model temperature sampling overload protecting circuit schematic diagram.Potentiometer RWC1 travelling arm end links to each other with the positive pole of the π formula filter capacitor CG1 of DC power supply; RWC1 one stiff end links to each other with thermistor RC1 one end, RC1 other end ground connection, and dividing point C is as temperature sampling signal of telecommunication source.When power transformer normally moves, be subjected to the resistance at that time of its temperature effect (the oil temperature rise of power transformer operating standard regulation upper strata must not be above 55 ℃ owing to be installed in thermistor RC1 in insulating oil upper strata or the secondary winding; Winding temperature rise must not be above 65 ℃).Adjust potentiometer RWC1 and resistance R C1 dividing potential drop this moment, makes the C point obtain predefined 6 volts of voltage signals, is added to integrated operational amplifier ICC inverting input through resistance R C2, as reference voltage; 5.6 volts of in-phase input end preestablish voltage, come free three terminal integrated voltage stabilizer ICE2 output through capacitor C E6, CE7, CG1, the filtered direct voltage of resistance R G1 π formula, and through adjusting potentiometer RWC2, the acquisition of resistance R C3 dividing potential drop.This voltage is lower than 0.4 volt of anti-phase reference edge, the voltage comparator output negative level that integrated operational amplifier ICC forms.Carrying out pipe BGF1 base voltage is zero volt, is in cut-off state.Do not have electric current to pass through in the relay J 1 suction coil as load, normally closed some J1-1 is in normally off.Because normally closed some J1-1 of relay is serially connected in the wire loop of magnetic switch of power transformer and goes, its normally closed some J1-1 still is in normally off, still has electric current to pass through in the coil of magnetic switch, and magnetic switch is not threaded off, and power transformer normally moves.When power transformer makes upper strata oil temperature because of overload; when winding temperature rise surpasses permissible value; negative tempperature coefficient thermistor RC1 temperature influence; resistance sharply descends; cause C point current potential to drop to about 5.2 volts; this voltage is added to integrated operational amplifier ICC inverting input through RC2; at this moment be lower than about 0.4 volt of in-phase input end voltage; the voltage comparator that causes integrated operational amplifier ICC to form is exported positive high level; through the RC5 current limliting; diode BGC1 conducting; cushion with capacitor C F1; make the collector current of carrying out pipe BGF1 reach maximum, be saturation condition, the suction coil of the load-relay J1 of BGF1 produces magnetic field and adhesive; normally closed some J1-1 disconnects simultaneously; cut off the suction coil power of the magnetic switch of power transformer, caused magnetic switch to be threaded off, reached the purpose of protection power transformer.Because integrated operational amplifier ICC exports positive high level, causes diode BGC2, light-emitting diode BGC3 conducting, BGC3 sends light signal, shows as overload fault.
Referring to Fig. 2 d: show the serious unbalance protection circuit theory diagrams of the utility model zero-sequence current sampling three-phase voltage.LDA is annular AC converter among the figure, is enclosed within on the secondary neutral line of power transformer elementary as the LDA coil.When the secondary A of power transformer, B, C three-phase voltage balance, non-zero-sequence current passes through in the neutral line, and LDA secondary coil two ends do not have induced potential, and diode BGD1, capacitor C D1, CD2, resistance R D1, RD2, D point, RD4 do not have d. c. voltage signal.The voltage comparator in-phase input end that integrated operational amplifier ICD forms is zero volt; 3 volts of reference voltage (power transformer operating standard regulations of the voltage of inverting input for setting, zero-sequence current must not surpass 25% of rated current, with this numerical value as the reference voltage limit value), this voltage signal is by three end integrated stable voltage circuit ICE2 output cathode direct voltages, through capacitor C E6, CE7, CG1, adjust potentiometer RWD dividing potential drop after the filtering of resistance R G1 π formula and obtain.Integrated operational amplifier ICD inverting input reference voltage is higher than 3 volts of in-phase input end voltages, causes integrated operational amplifier ICD output negative level, and carrying out pipe BGF1 base voltage is zero volt, is in cut-off state.The suction coil of relay J 1 does not wherein have electric current to pass through as the load of carrying out pipe BGF1, and its normally closed some J1-1 is in normally off.Because 1 normally closed some J1-1 two ends of relay J are serially connected in the suction coil and power supply one end of power transformer magnetic switch respectively, still have electric current to pass through in the suction coil of magnetic switch, magnetic switch is not threaded off, and power transformer normally moves.
When the secondary A of power transformer, B, C three-phase, arbitrary load appears mutually when serious uneven, just there is electric current to pass through in the neutral line, simultaneously, LDA level of ring-like AC converter two ends have induced voltage to produce, this voltage produces direct voltage behind diode BGD1, capacitor C D1, CD2 rectifying and wave-filtering, obtain 5 volts of d. c. voltage signals through resistance R D1 dividing potential drop RD2 current limliting at the D point again.This voltage signal is added to integrated operational amplifier ICD in-phase input end through RD4, and it is higher than 2 volts of inverting input voltages.This moment, in-phase input end was in high potential, and the voltage comparator that causes integrated operational amplifier ICD to form is exported positive high level.By resistance R D6 current limliting, diode current flow, capacitor C F1 buffering.Carry out pipe BGF1 collector current and reach maximum, be saturation condition.Making the load of carrying out pipe BGF1--the suction coil of relay J 1 produces magnetic field and adhesive, and normally closed some J1-1 disconnects simultaneously, cut off the suction coil power of the magnetic switch of power transformer, causes magnetic switch to be threaded off, and reaches the purpose of protection power transformer.Because ICD output is just senior flat, causes diode BGD3, light-emitting diode BGD4 conducting, BGD4 sends light signal, shows as the three-phase imbalance fault.
Referring to Fig. 2 e: show the utility model phase-samplomh uninterrupted power supply schematic diagram.The end of the same name of three marks " " symbol that phase transformer BE1, BE2 among the figure, BE3 are elementary links to each other; The end of the same name of three unmarked " " symbols is connected with the secondary A of power transformer, B, C three respectively.LE1～LE6 is respectively the secondary of phase transformer BE1～BE3.
Arbitrary when the phase failure occurring mutually among normal or A, the C when the elementary or secondary A of power transformer, B, C three-phase, secondary LE2, the LE3 of phase transformer BE2, LE4 all have induced voltage to produce.The voltage that LE2 responded to is input to the input of three terminal integrated voltage stabilizer ICE1 behind bridge rectifier Q1 and capacitor C E1, CE2 rectifying and wave-filtering.The ICE1 output is added to electric current on the suction coil of load-relay J2 through capacitor C E3 buffering, and at this moment the suction coil produces magnetic field and adhesive, and often make war J2-1, J2-2 are in closure state.The alternating voltage that LE3, LE4 responded to, be input to the input of Q2 respectively by relay normally open point J2-1, J2-2.The output of Q2 is input to the input of three terminal integrated voltage stabilizer ICE2, ICE3 respectively behind capacitor C E4, CE5, CE8, CE9 rectifying and wave-filtering.The output of ICE2 obtains the positive polarity direct voltage after capacitor C E6, CE7 buffering, filtering; The output of ICE3 obtains the negative polarity direct voltage after capacitor C E10, CE11 buffering, filtering.
When power transformer is primary and secondary when the phase failure of B phase occurring, corresponding phase transformer BE1～BE3 with the secondary B phase place mutually that all lacks of elementary LE1～LE6.Therefore, secondary LE5, the LE6 of BE3 have the induction alternating voltage, and the LE2 of BE2, LE3, all non-inductive voltage of LE4.This just causes the equal no current of suction coil of bridge rectifier Q1, the capacitor C E1, CE2, three terminal integrated voltage stabilizer ICE1, diode BGE1, capacitor C E3 and the relay J 2 that link to each other with the LE2 two ends to pass through, and the J2-1 of often making war, J2-2 return to normally open.Cut off simultaneously with normal battle the phase transformer BE2 that J2-1, J2-2 link to each other the non-earth terminal of secondary LE3, LE4 and the path of Q2 input.Also cause relay J J2-1, J2-2 to return to normally off simultaneously at 2 normally closed.Secondary LE5, the LE6 of phase transformer BE3 all respond to alternating voltage, and are input to the input of Q2 at normally closed respectively by J2-1, J2-2 of relay J 2.The output of Q2 is input to the input of three terminal integrated voltage stabilizer ICE2, ICE3 respectively after capacitor C E4, CE5, CE8, CE9 filtering.The output of ICE2 obtains the positive polarity direct voltage through capacitor C E6, CE7 buffering and filtering; The output of ICE3 obtains the negative polarity direct voltage after capacitor C E10, CE11 buffering, filtering.The positive polarity direct voltage of ICE2 output is through resistance R E1, diode BE5, light-emitting diode BGE6 conducting simultaneously, and BGE6 is luminous normally to move demonstration as uninterrupted power supply.Diode BGE1, BGE3, BGE4 are connected in ICE1, ICE2, ICE3 input, output two ends respectively in parallel, play the effect of protection pressurizer.
The above causes phase change to power transformer is primary and secondary mutually because of lacking one, the corresponding primary and secondary phase place of the phase transformer actual conditions that also change simultaneously, causing the load of the secondary LE2 of phase transformer BE2--the adhesive of suction coil or the release of relay J 2 change in moment too at its normal battle, normally closed some J2-1, J2-2.Secondary LE3, the LE4 of phase transformer BE2 and the secondary LE5 of BE3, the alternating voltage that LE6 is responded to respectively constantly are input to bridge rectifier Q2 input.Guaranteed the phase time that lacks in office, the Q2 input all has needed alternating voltage.This is the feature of uninterrupted power supply in the utility model.
Fig. 2 f shows the utility model output circuit schematic diagram, and the base stage of triode BGF1 links to each other with the positive terminal of capacitor C F1 with the negative electrode of diode BGA2, BGB2, BGC1, BGD2 among the figure; The collector electrode of triode BGF1 links to each other with the also chord road of diode BGE2, relay J 1; Normally closed some J1-1 two ends of relay J 1 respectively with power supply one end of suction coil one end of power transformer magnetic switch and suction coil be connected in series (Fig. 2 f part omitted).
Claims (2)
1, power transformer multi-function protector is characterized in that it comprises:
The phase-samplomh open-phase protection circuit, the end of the same name of phase transformer BA1, BA2, elementary three marks of BA3 " " symbol links to each other in the described phase-samplomh open-phase protection circuit, and the end of the same name of three unmarked " " symbols links to each other with A, B, C three-phase respectively.Secondary LA1, LA2, LA3 different name end are connected in series, and the terminal of unmarked " " symbol of LA1 is through diode BGA1, and resistance R A1, RA2 series arm and the voltage comparator inverting input of being made up of integrated operational amplifier ICA link to each other.(voltage comparator is hereinafter to be referred as comparator);
The phase-samplomh overvoltage crowbar, the end of the same name of phase transformer BE1, BE2, elementary three marks of BE3 " " symbol links to each other in the described phase-samplomh overvoltage crowbar; The end of the same name of three unmarked " " symbols is connected with A, B, C three respectively; The terminal of secondary LE1 unmarked " " symbol is through diode BGB1, and resistance R B1, RB2 series arm and the comparator in-phase input end of being made up of integrated operational amplifier ICB link to each other;
Temperature sampling overload protecting circuit, the capacitor C G1 anode of potentiometer RWC1 travelling arm end and the filtering of π formula is connected in the described temperature sampling overload protecting circuit, and RCW1 one end and thermistor RC1 one end are connected in the C point; RC1 other end ground connection, dividing potential drop C point links to each other with the comparator end of oppisite phase input of being made up of integrated operational amplifier ICC by resistance R C2;
The serious unbalance protection circuit of zero-sequence current sampling three-phase voltage, in the serious unbalance protection circuit of described zero-sequence current sampling three-phase voltage, annular AC converter LDA is enclosed within on the secondary neutral line of power transformer as elementary, and LDA time grade of arbitrary end of power pack links to each other through diode RD1, RD2 series arm and the voltage comparator in-phase input end be made up of integrated operational amplifier ICD;
The output of operational amplifier ICA, ICB, ICC, ICD all is made up of two branch roads in described each protective circuit: a branch road links to each other with triode BGF1 base stage through resistance R A6, RB6, RC5, RD6 and diode BGA2, BGB2, BGC1, BGD2 respectively, and the collector electrode of BGF1 is connected with diode BGF2 parallel branch with relay J 1; Another branch road links to each other with light-emitting diode BGA4, BGB4, BGC3, BGD4 anode through diode BGA3, BGB3, BGC2, BGD3 respectively, and the light-emitting diodes tube cathode all connects collective's electrode of carrying out pipe BGF1.
2, by the described power transformer multi-function protector of claim 1, it is characterized in that it also comprises a phase-samplomh uninterrupted power supply circuit, it provides guarantee for the normal operation of power transformer multi-function protector.Phase transformer BE1 in the described phase-samplomh uninterrupted power supply circuit, BE2, the end of the same name of elementary three marks of BE3 " " symbol links to each other, the end of the same name of three unmarked " " symbols respectively with A, B, the secondary LE2 two ends of the continuous phase transformer BE2 of C three-phase link to each other with the input of bridge rectifier Q1 respectively, the output of Q1 links to each other with three end integrated stable voltage circuit ICE1 inputs, the output of ICE1 and relay J 2 and diode BGE2 are connected in parallel and form the uninterrupted power supply change-over circuit, and bridge rectifier Q2 input is made up of two circuit: one by secondary LE3, the non-earth terminal of LE4 is respectively through relay normally open point J2-1, J2-2 links to each other; Another is linked to each other through relay normally closed some J2-1, J2-2 respectively by the non-earth terminal of secondary LE5, LE6; Another is linked to each other through relay normally closed some J2-1, J2-2 respectively by the non-earth terminal of secondary LE5, LE6, and bridge rectifier Q2 output links to each other with the input of three end integrated stable voltage circuit ICE2, ICE3 respectively; Diode BGE3, BGE4 are connected in input, the output two ends of three end integrated stable voltage circuit ICE2, ICE3 respectively in parallel; The ICE2 output links to each other its minus earth with diode BGE5 with light-emitting diode BGE6 anode through resistance R E1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94215762 CN2205600Y (en) | 1994-06-27 | 1994-06-27 | Multifunction protector for electric transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94215762 CN2205600Y (en) | 1994-06-27 | 1994-06-27 | Multifunction protector for electric transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2205600Y true CN2205600Y (en) | 1995-08-16 |
Family
ID=33831658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94215762 Expired - Fee Related CN2205600Y (en) | 1994-06-27 | 1994-06-27 | Multifunction protector for electric transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2205600Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316705C (en) * | 2003-06-09 | 2007-05-16 | 湖南正通智能电器有限公司 | Intelligent contactless switch |
| CN101226797B (en) * | 2007-01-16 | 2013-03-27 | 肖光希 | Peculiar current-limiting potential dividing ring impedor |
-
1994
- 1994-06-27 CN CN 94215762 patent/CN2205600Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1316705C (en) * | 2003-06-09 | 2007-05-16 | 湖南正通智能电器有限公司 | Intelligent contactless switch |
| CN101226797B (en) * | 2007-01-16 | 2013-03-27 | 肖光希 | Peculiar current-limiting potential dividing ring impedor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101959348A (en) | LED stepless dimming drive circuit and LED lamp | |
| CN101741076B (en) | YBCO high-temperature superconducting strip-based short circuit fault current limiter | |
| CN101789589B (en) | Mixed-type high-temperature superconducting short trouble current limiter | |
| CN205565727U (en) | Hoisting device is synthesized to rural power grids low -voltage on post | |
| CN113659609A (en) | Single-wire series-connected direct-current high-voltage remote supply intelligent power supply system and method | |
| CN103022978A (en) | Under-voltage protection circuit for multi-pulse-wave rectifying circuit | |
| CN206850446U (en) | A kind of intelligent load-balancing regulator | |
| CN2205600Y (en) | Multifunction protector for electric transformer | |
| CN101064480B (en) | AC power source converting apparatus and method | |
| CN210007482U (en) | interphase power taking device capable of avoiding influence of single-phase earth fault | |
| CN209104848U (en) | Charge pile group current distribution system | |
| CN209104847U (en) | Charging pile control unit | |
| CN209104805U (en) | High voltage protective module | |
| CN201163716Y (en) | Short trouble current limiter with energy consumption resistor | |
| CN205565730U (en) | Automatic transfer and hold pressure regulating distribution transformer low pressure system energy saving equipment | |
| CN209786798U (en) | low-energy-consumption energy-saving bypass stepless voltage regulating device | |
| CN200976496Y (en) | AC power switch apparatus | |
| CN112564010A (en) | Micro-grid ice melting current control device based on novel magnetically controlled adjustable reactor and control method thereof | |
| CN209299152U (en) | High voltage rectifier stack control system | |
| CN209104885U (en) | Charging pile control system | |
| CN201887450U (en) | Current-limiting adjustable protector circuit for AC circuit | |
| CN2241407Y (en) | Under-voltage open-phase protector for motor | |
| CN212969064U (en) | Unbalanced three phase governing system | |
| CN209913505U (en) | Intelligent low-voltage reactive power compensator | |
| CN203135441U (en) | Distribution network electric energy quality optimization comprehensive apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |