CN2293147Y - Multifunctional phase- and amplitude-discriminating electric leakage protective device - Google Patents
Multifunctional phase- and amplitude-discriminating electric leakage protective device Download PDFInfo
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- CN2293147Y CN2293147Y CN 97215461 CN97215461U CN2293147Y CN 2293147 Y CN2293147 Y CN 2293147Y CN 97215461 CN97215461 CN 97215461 CN 97215461 U CN97215461 U CN 97215461U CN 2293147 Y CN2293147 Y CN 2293147Y
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- phase
- circuit
- electric leakage
- amplitude
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Abstract
The utility model relates to a multifunctional phase and amplitude-discriminating electric leakage protector which is used for electric leakage limitation and electrical shock protection in a three-phase four-line distribution line. The multifunctional phase and amplitude-discriminating electric leakage protector is composed of a zero sequence current transformer (1), an electric leakage analysis controller (2) and an alternating current contactor (3); the electric leakage analysis controller (2) is provided with a phase discriminating and amplitude discriminating circuit, an electric leakage over-limitation operation circuit, and an electric leakage phase and amplitude indicating circuit; the alternating current contactor runs a control circuit soundlessly. The utility model can cause an electric shock operating value to be free from the influence of electricity leakage, electrical leak over-limitation to act, electric leakage phase and amplitude to be indicated and the alternating current contactor to run soundlessly in an electricity saving mode.
Description
The utility model is a kind of three-phase leakage current action protecting device, be used for the three-phase and four-line distribution line leak electricity with opposing the restriction and personal electrical shock protection.
In existing three-phase electric leakage protection device, when line-to-ground leaks electricity, all can not indicate electric leakage to occur in that phase circuit, be not easy to the electrician and search leak current fault.As " (phase demodulation amplitude discrimination silent running earth leakage protective device " (patent No. is 95217004.3), though leakage current table indication electrical leakage quantity is arranged, can not indicate the phase place of electric leakage.
The purpose of this utility model is: on the basis of my original design " phase demodulation amplitude discrimination impulse type earth leakage protective device " (number of patent application 96250129.8), increase electric leakage phase place deixis.Make earth leakage protective device have multiple functions such as the action of electric shock phase demodulation amplitude discrimination, the demonstration of electric leakage phase amplitude and the operation of control ac contactor silent.
Fig. 1 is a theory diagram of the present utility model, and it is by zero sequence current mutual inductor (1), analysis for current leakage controller (2), and A.C. contactor (3) three parts are formed.When installing and using, supply line is passed from the magnet ring of zero sequence current mutual inductor (1), and arrives the electricity consumption end by the normally opened contact of A.C. contactor (3).The secondary coil of zero sequence current mutual inductor (1) connects the input of phase shift amplifier (21) in the analysis for current leakage controller, the electric leakage of the output termination of phase shift amplifier (21) the transfinite input of gating circuit (22) and the input of phase demodulation amplitude discrimination circuit (23), the transfinite output of gating circuit (22) and the output of phase demodulation amplitude discrimination circuit (23) of electric leakage all received the input of circuits for triggering (24), the input of the output termination silent running control circuit (25) of circuits for triggering (24), the output control of silent running control circuit (25) exchanges contact (3); The input of the output termination electric leakage phase place indicating circuit (26) of the output of amplifying circuit (21) and phase demodulation amplitude discrimination circuit (23); The output of amplifying circuit (21) connects the input of electrical leakage quantity indicating circuit (27) again; (28) be power circuit, provide protector each several part working power own.The utility model is on my the intrinsic basis that has had improved phase demodulation amplitude discrimination function and silent running function " phase demodulation amplitude discrimination impulse type earth leakage protective device "; increased electric leakage phase place deixis, the electric leakage phase place indicating circuit that is characterised in that of the present utility model.Electric leakage phase place indicating circuit is made up of three comparators and three light-emitting diodes etc.The in-phase end connecting resistance of each comparator and the contact that diode is in series, the in-phase end of three comparators is controlled by A, B, C control circuit three detection times in the phase demodulation amplitude discrimination circuit (23) by resistance respectively, detecting moment (about 1ms), the sample of amplifier (21) output passes to the in-phase end of comparator by diode, the mutually tested instantaneous value that leaks electricity is higher than the threshold values of end of oppisite phase, comparator is exported glittering light-emitting diode, glittering 50 times of per second; The electric leakage amplitude is then by the indication of table meter.
The utility model is compared with existing three-phase phase-detecting amplitude-detecting leak protector: increased electric leakage phase place deixis, be convenient to the electrician and search the leak current fault circuit.With in the electric line, each single-phase electricity consumption branch road is arranged all generally at three-phase and four-line, the indication of electric leakage phase place can help the electrician to differentiate that branch road electric leakage.
Fig. 1 is a complete machine block diagram of the present utility model, and Fig. 2 is circuit theory diagrams.Existing two figure are to as directed: among Fig. 2, and TA
oBe zero sequence current mutual inductor, corresponding to (1) in the block diagram; Among Fig. 2, operational amplifier N
1Deng forming the phase shift amplifying circuit, corresponding to (21) in the block diagram; Among Fig. 2, V
26, R
35, R
36, C
17Deng forming the gating circuit that transfinites that leaks electricity, corresponding to (22) in the block diagram; Among Fig. 2, comparator N
5～N
8Deng the control section of forming in phase demodulation amplitude discrimination circuit detection time, analog switch S
1～S
4, comparator N
9～N
11Deng the phase amplitude variation amount gate unit of forming in the phase demodulation amplitude discrimination circuit, two parts are formed the phase demodulation amplitude discrimination circuit, corresponding to (23) in the block diagram; Among Fig. 2, comparator N
12Deng forming circuits for triggering, corresponding to (24) among the figure; Among Fig. 2, V
1～V
5, K
1, K
2, V
34～V
40Deng forming the ac contactor silent running control circuit, corresponding to (25) in the block diagram; Among Fig. 2, comparator N
2～N
4, light-emitting diode V
10～V
12Deng forming electric leakage phase place indicating circuit, corresponding to (26) in the block diagram; Among Fig. 2, C
6, R
11, R
12, V
13And m
ATable is formed the electrical leakage quantity indicating circuit, corresponding to (27) in the block diagram; Among Fig. 2, T, V
6, V
7, C
2, C
3, IC
1Deng forming this machine working power circuit, corresponding to (28) in the block diagram; Among Fig. 2, A.C. contactor KM is corresponding to (3) in the block diagram.
Among Fig. 2, the phase demodulation amplitude discrimination circuit have A arranged side by side, B, C three tunnel, three tunnel by detection time control circuit form with amplitude variation amount gating circuit mutually.Comparator in three tunnel detection time control circuits, its in-phase end connects by resistance and diode and splits power supply mutually, and (the A road meets the u that splits the phase power supply
BWith u
C, the B road meets the u that splits the phase power supply
AWith u
C, the C road meets the u that splits the phase power supply
AWith u
B); Its end of oppisite phase all connects the dividing potential drop of rectification filtering power, and its output connects the control end of the analog switch in the phase amplitude variation amount gating circuit respectively; On the other hand, electric shock signal is through N
1Deng the phase shift paraphase of the phase shift amplifier of forming, and superposition is transported to the input of A, B, three analog switches of C on the 7.5V DC power supply; The output of three analog switches connects the in-phase end of amplitude discrimination comparator respectively through coupling capacitance, the output of three amplitude discrimination comparators is connected into the bifurcation node through resistance, the bifurcation node contacts the input of Power Generation Road (24) by series resistor, also be connected to the bypass analog switch behind the series resistor, the bypass analog switch is controlled by the bifurcation node.If establishing B gets an electric shock mutually, splitting phase power supply u
AWith u
CThe analog switch S that is controlled
2During conducting, the positive peak of B phase electric shock signal is through capacitor C
14Be coupled to amplitude discrimination comparator N
10In-phase end, N
10The output high potential, the voltage of the about 5V of bifurcation node output passes to the input of circuits for triggering (24) through resistance, and the output of circuits for triggering promotes bang-bang circuit (25), and A.C. contactor is tripped, and uses the electric line dead electricity; When B leaks electricity when removing mutually, A, C two-way are all exported high potential in the phase demodulation amplitude discrimination circuit, and the bifurcation node potential rises to about 10V, bypass analog switch S
4Conducting, the signal behind the series resistor is by S
4Institute's bypass can not be imported circuits for triggering (24) into, and electric leakage is removed can not malfunction; Among Fig. 2, electric leakage phase place indicating circuit is by comparator N
2, N
3, N
4, light-emitting diode V
10, V
11, V
12Deng composition.If establishing B leaks electricity mutually, splitting phase power supply u
AWith u
CThe comparator N that is controlled
6Output high potential moment (about 1ms), B phase electric leakage signal also alternation to posivtive spike, R
25With V
23The phase contact (meet N
3In-phase end) current potential is higher than N
3End of oppisite phase, N
3Output makes light-emitting diode V
11Glittering, glittering 50 times of per second.Among Fig. 2, C
6, R
11, R
12, V
13And M
ATable is formed electric leakage amplitude display circuit, during electric leakage (its value is in allowing limit), and amplifier N
1The fluctuating signal of output is through C
6Every straight, V
13After the rectification, make M
ATable indicates; Light-emitting diode V
14Do the indication of protector working power, V
40Do A.C. contactor tripping operation indication.
Claims (2)
1, a kind of multi-functional phase-detecting amplitude-detecting leak protector, it is made up of zero sequence current mutual inductor (1), analysis for current leakage controller (2), A.C. contactor (3) three parts.Supply line is passed from the magnet ring of zero sequence current mutual inductor (1), and A, B, three phase lines of C arrive the electricity consumption end by the normally opened contact of A.C. contactor (3); The secondary coil of zero sequence current mutual inductor (1) connects the input of phase shift amplifying circuit (21) in the analysis for current leakage controller, the electric leakage of the output termination of phase shift amplifying circuit (21) the transfinite input of gating circuit (22) and the input of phase demodulation amplitude discrimination circuit (23), the transfinite output of gating circuit (22) and the output of phase demodulation amplitude discrimination circuit (23) of electric leakage all received the input of circuits for triggering (24), the input of the output termination silent running control circuit (25) of circuits for triggering (24), the output control A.C. contactor (3) of silent running control circuit (25); The output of the output of amplifying circuit (21) and phase demodulation amplitude discrimination circuit (23) connects the input of electric leakage phase place indicating circuit (26) again; The output of amplifier (21) connects the input of electrical leakage quantity indicating circuit (27) again; (28) be power circuit, provide protector each several part working power own; The utility model is on my the intrinsic basis that has had improved phase demodulation amplitude discrimination function and silent running function " phase demodulation amplitude discrimination impulse type earth leakage protective device "; increased electric leakage phase place deixis, the electric leakage phase place indicating circuit that is increased that is characterised in that of the present utility model.
2, multi-functional phase-detecting amplitude-detecting leak protector according to claim 1 is characterized in that: electric leakage phase place indicating circuit is made up of three comparators and three institutes such as light-emitting diode; The in-phase end connecting resistance of each comparator and the contact that diode is in series, the in-phase end of three comparators is controlled by A, B, C control circuit three detection times in the phase demodulation amplitude discrimination circuit (23) by resistance respectively, detecting moment (about 1ms), the sample of amplifier (21) output passes to the in-phase end of comparator by diode, the mutually tested instantaneous value that leaks electricity is higher than the threshold values of end of oppisite phase, comparator is exported glittering light-emitting diode, glittering 50 times of per second; The electric leakage amplitude is then by the indication of table meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97215461 CN2293147Y (en) | 1997-04-27 | 1997-04-27 | Multifunctional phase- and amplitude-discriminating electric leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97215461 CN2293147Y (en) | 1997-04-27 | 1997-04-27 | Multifunctional phase- and amplitude-discriminating electric leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2293147Y true CN2293147Y (en) | 1998-09-30 |
Family
ID=33932610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97215461 Expired - Fee Related CN2293147Y (en) | 1997-04-27 | 1997-04-27 | Multifunctional phase- and amplitude-discriminating electric leakage protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2293147Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572530A (en) * | 2015-12-11 | 2016-05-11 | 国网北京市电力公司 | Electric leakage detection device |
| CN108400606A (en) * | 2018-05-09 | 2018-08-14 | 上力电力科技有限公司 | A kind of three-phase residual current automatic balancing circuit |
| CN110675714A (en) * | 2019-10-18 | 2020-01-10 | 国网四川省电力公司南充供电公司 | Searching training platform and method for simulating low-voltage leakage fault of power distribution system |
-
1997
- 1997-04-27 CN CN 97215461 patent/CN2293147Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572530A (en) * | 2015-12-11 | 2016-05-11 | 国网北京市电力公司 | Electric leakage detection device |
| CN108400606A (en) * | 2018-05-09 | 2018-08-14 | 上力电力科技有限公司 | A kind of three-phase residual current automatic balancing circuit |
| CN110675714A (en) * | 2019-10-18 | 2020-01-10 | 国网四川省电力公司南充供电公司 | Searching training platform and method for simulating low-voltage leakage fault of power distribution system |
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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 |