CN109066713B - Electric power reactive compensation capacitor detection and alternating current contactor protection circuit - Google Patents

Electric power reactive compensation capacitor detection and alternating current contactor protection circuit Download PDF

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Publication number
CN109066713B
CN109066713B CN201810967061.3A CN201810967061A CN109066713B CN 109066713 B CN109066713 B CN 109066713B CN 201810967061 A CN201810967061 A CN 201810967061A CN 109066713 B CN109066713 B CN 109066713B
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resistor
transistor
capacitor
pin
grounded
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CN109066713A (en
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刘举柱
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Lu'an City Tongxinchangneng Electronic Technology Co ltd
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Lu'an City Tongxinchangneng Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses an electric power reactive compensation capacitance detection and alternating current contactor protection circuit, which comprises a zero line L1, a live line N1, a switch KM1, bridge rectifier diodes D1-D4, bridge rectifier diodes D9-D12, a light sensing coupler IC1-IC3, a voltage stabilizing diode VD1-VD2, a triode Q1-Q7, a diode D5-D8, a relay J1, a relay normally closed contact JI-1, a relay normally closed contact JI-2, a relay normally closed contact JI-3, an alternating current contactor K1, an alternating current contactor normally closed contact K1-1, an alternating current contactor normally closed contact K1-2, an alternating current contactor normally closed contact K1-3, a reactive compensation capacitor CL1-CL3, a capacitor C1-C4, a resistor R1-R15 and a buzzer Y1; by arranging the reactive compensation capacitor detection and alternating current contactor protection circuit, the reactive compensation capacitors on the three-phase voltage and the three-phase voltage work in parallel, so that the used power equipment obtains capacitance compensation power, and simultaneously, the alternating current contactor is protected from being burnt out due to electric arcs generated by instantaneous large-current charging when the alternating current contactor is instantly connected with the reactive compensation capacitors.

Description

Electric power reactive compensation capacitor detection and alternating current contactor protection circuit
Technical Field
The invention relates to the field of electronic equipment, in particular to a power reactive compensation capacitor detection and alternating current contactor protection circuit.
Background
Capacitors are widely used in many terminal electronic devices, such as ac contactors for touch control on the display screen of the terminal device.
The working principle of the alternating current contactor is that the contact is connected and disconnected by matching electromagnetic force with the elastic force of a spring. The alternating current contactor has two working states, namely a power-off state (release state) and a power-on state (action state). When the attraction coil is electrified, the static iron core generates electromagnetic attraction force, the armature is attracted, and the connecting rod connected with the armature drives the contact to act, so that the normally closed contact breaking contactor is in an electrified state; when the attraction coil is powered off, the electromagnetic attraction force disappears, the armature is reopened, the normally open contact is closed, the normally open contact is released under the action of the position spring, all the contacts reset accordingly, and the contactor is in a power-off state.
Traditional reactive compensation capacitance detects because the circuit does not possess the effect of control ac contactor's normally open contact in the use, and thus the electric arc that the heavy current in the twinkling of an eye that produces charges can burn out ac contactor, then destroys circuit components and parts light, then seriously arouses the conflagration, endangers people's the security of the lives and property. To this end, a protection circuit capable of protecting the ac contactor in the reactive compensation capacitor is desired.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a power reactive compensation capacitor detection and alternating current contactor protection circuit with simple circuit design, reasonable structure and high practicability.
The technical problem to be solved by the invention is realized by adopting the following technical scheme: the electric power reactive compensation capacitance detection and alternating current contactor protection circuit comprises a zero line L1, a live line N1, a switch KM1, bridge rectifier diodes D1-D4, bridge rectifier diodes D9-D12, a light sensing coupler IC1, a light sensing coupler IC2, a light sensing coupler IC3, a voltage stabilizing diode VD1, a voltage stabilizing diode VD2, a triode Q1, a triode Q2, a triode Q3, a triode Q4, a triode Q5, a triode Q6, a triode Q7, a diode D5, a diode D6, a diode D7, a diode D8, a relay J1, a normally closed contact JI-1, a normally closed contact JI-2, a normally closed relay contact JI-3, an alternating current contactor K1, an alternating current contactor K1-1, an alternating current contactor K1-2, an alternating current contactor K1-3, a reactive contact compensation capacitance CL1, a reactive compensation capacitance CL2 and a switch 2, Reactive compensation capacitor CL3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, buzzer Y1, three-phase line A-phase A1, three-phase line A-phase A2, three-phase line B-phase B-1, three-phase line B-phase B2, three-phase line C-phase C1 and three-phase line C-phase C2;
the zero line L1 is respectively connected to a pin 1 of an alternating current contactor K1 through a switch KM1 and a pin 1 of bridge rectifier diodes D1-D4 through a capacitor C1, pins 4 of the bridge rectifier diodes D1-D4 are grounded, a live wire N1 is respectively connected to an output pin 3 of the light-sensitive coupler IC1 and pins 2 of the bridge rectifier diodes D1-D1, a pin 2 of the alternating current contactor K1 is connected to an input pin 4 of the light-sensitive coupler IC1, pins 3 of the bridge rectifier diodes D1-D1 are respectively connected to one end of the capacitor C1, the cathode of the voltage stabilizing diode VD1, a pin 1 of the relay J1, the collector of the triode Q1 and the cathode of the voltage stabilizing diode VD1 through a resistor R1, one end of the resistor R1, the cathode of the diode D1, the cathode of the resistor R1, the anode of the voltage stabilizing diode VD1 and the anode of the voltage stabilizing diode VD1 are grounded, the other end of the resistor R2 is grounded, the anode of the diode D7 is connected to the other end of the resistor R3, one end of the capacitor C3 and the base of the transistor Q1, the other end of the capacitor C3 is grounded, the emitter of the transistor Q1 is connected to the cathode of the diode D5, the collector is connected to the base of the transistor Q2 via a resistor R4, the collector of the transistor Q2 is connected to the 2-pin of the relay J1, the emitter of the transistor Q2 is grounded, the 1-pin of the optical coupler IC1 is connected to one end of the resistor R8, the anode of the diode D8, one end of the resistor R8 and the cathode of the diode D8 via a resistor R9, the 2-pin of the optical coupler IC 8 is connected to the collector of the transistor Q8, the emitter of the transistor Q8 is grounded, the other end of the resistor R8 is connected to the collector of the transistor Q8, the base of the transistor Q8 is connected to the connecting line of the, the base electrode of the transistor Q3 is connected to the negative electrode of a diode D8, the base electrodes are respectively connected to the other end of a resistor R7, one end of a capacitor C4 is grounded and the positive electrode of a diode D6, the other end of a capacitor C4 is grounded, the base electrode of a transistor Q8 is connected to a connecting line of a resistor R8 and the collector electrode of a transistor Q4, the emitter electrode of a transistor Q8 is respectively connected to a pin 4 of a light-sensing coupler IC2, one end of a resistor R6 and one end of a buzzer Y1, a pin 3 of the light-sensing coupler IC2 is respectively connected to one end of the resistor R2 and the base electrode of the transistor Q2 through a resistor R2, the other end of the resistor R2 is grounded, the emitter electrode of the transistor Q2 is grounded, the collector electrode of the transistor Q2 is connected to the other end of the resistor R2, the other end of the buzzer Y2 is connected to the collector electrode of the transistor Q2, the base electrode of the transistor Q2 is, the emitter of the triode Q7 is grounded, and two ends of the resistor R5 are connected in parallel to the collector and the base of the triode Q8;
the relay J1 is connected in series with an AC contactor K1, and an internal protection circuit is arranged in the internal protection circuit, wherein a three-phase line A-phase A1 is connected to one end of a compensation capacitor CL1 through an AC contactor normally-closed switch K1-1, a three-phase line B1 is connected to a connecting line of the compensation capacitor CL1 and a compensation capacitor CL2 through an AC contactor normally-closed switch K1-2, a three-phase line C-phase C1 is connected to one end of a compensation capacitor CL3 through an AC contactor normally-closed switch K1-3, a three-phase line A-phase A2 is connected to one end of the compensation capacitor CL1 through a relay J1-1 and a resistor R13, a three-phase line B-phase B1 is connected to a connecting line of the compensation capacitor CL1 and the compensation capacitor CL1, a three-phase line C-phase C1 is connected to one end of the compensation capacitor CL 72 through a relay J1-3 and a resistor R1, and the compensation capacitor CL 72 are connected in parallel with two ends of the compensation capacitor CL 72, a current transformer L3 is arranged on a connecting line of an AC contactor normally-closed switch K1-1 and a compensation capacitor CL1, a current transformer L2 is arranged on a connecting line of the AC contactor normally-closed switch K1-2 connected to a connecting line of the compensation capacitor CL1 and a compensation capacitor CL2, a current transformer L1 is arranged on a connecting line of the AC contactor normally-closed switch K1-3 and the compensation capacitor CL2, the compensation capacitors CL1, CL2 and CL3 are connected in series to a pin 1 and a pin 2 of bridge rectifier diodes D9-D12, the pin 3 of the bridge rectifier diodes D9-D12 is grounded, the pin 4 is respectively connected to one end of a resistor R14 and the pin 1 of a light sensing coupler IC3 through a resistor R15, the other end of the resistor R14 is grounded, and the pin 2 of the light sensing coupler IC3 is grounded.
The invention has the beneficial effects that: by arranging the reactive compensation capacitor detection and alternating current contactor protection circuit, the reactive compensation capacitors on the three-phase voltage and the three-phase voltage work in parallel, so that the used power equipment obtains capacitance compensation power, and simultaneously, the alternating current contactor is protected from being burnt out due to electric arcs generated by instantaneous large-current charging when the alternating current contactor is instantly connected with the reactive compensation capacitors.
Drawings
FIG. 1 is a schematic diagram of the circuit structure of the present invention;
FIG. 2 is a schematic diagram of an internal protection circuit of the AC contactor according to the present invention;
Detailed Description
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Example 1
Referring to fig. 1-2, the circuit for detecting the reactive power compensation capacitance and protecting the ac contactor includes a zero line L1, a live line N1, a switch KM1, bridge rectifier diodes D1-D4, bridge rectifier diodes D9-D12, a light-sensitive coupler IC1, a light-sensitive coupler IC2, a light-sensitive coupler IC3, a voltage-stabilizing diode VD1, a voltage-stabilizing diode VD2, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a transistor Q5, a transistor Q6, a transistor Q7, a diode D5, a diode D6, a diode D7, a diode D8, a relay J1, a normally closed relay contact JI-1, a normally closed relay contact JI-2, a normally closed relay contact JI-3, an ac contactor K1, an ac contactor K1-1, an ac contactor normally closed K1-2, an ac contactor K1-3, a reactive power compensation capacitance 1, a normally closed contact CL-D, A reactive compensation capacitor CL2, a reactive compensation capacitor CL3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a buzzer Y1, a three-phase line a-phase a1, a three-phase line a-phase a2, a three-phase line B-phase B1, a three-phase line B-phase B2, a three-phase line C-phase C1, and a three-phase line C-phase C2;
the zero line L1 is respectively connected to a pin 1 of an alternating current contactor K1 through a switch KM1 and a pin 1 of bridge rectifier diodes D1-D4 through a capacitor C1, pins 4 of the bridge rectifier diodes D1-D4 are grounded, a live wire N1 is respectively connected to an output pin 3 of the light-sensitive coupler IC1 and pins 2 of the bridge rectifier diodes D1-D1, a pin 2 of the alternating current contactor K1 is connected to an input pin 4 of the light-sensitive coupler IC1, pins 3 of the bridge rectifier diodes D1-D1 are respectively connected to one end of the capacitor C1, the cathode of the voltage stabilizing diode VD1, a pin 1 of the relay J1, the collector of the triode Q1 and the cathode of the voltage stabilizing diode VD1 through a resistor R1, one end of the resistor R1, the cathode of the diode D1, the cathode of the resistor R1, the anode of the voltage stabilizing diode VD1 and the anode of the voltage stabilizing diode VD1 are grounded, the other end of the resistor R2 is grounded, the anode of the diode D7 is connected to the other end of the resistor R3, one end of the capacitor C3 and the base of the transistor Q1, the other end of the capacitor C3 is grounded, the emitter of the transistor Q1 is connected to the cathode of the diode D5, the collector is connected to the base of the transistor Q2 via a resistor R4, the collector of the transistor Q2 is connected to the 2-pin of the relay J1, the emitter of the transistor Q2 is grounded, the 1-pin of the optical coupler IC1 is connected to one end of the resistor R8, the anode of the diode D8, one end of the resistor R8 and the cathode of the diode D8 via a resistor R9, the 2-pin of the optical coupler IC 8 is connected to the collector of the transistor Q8, the emitter of the transistor Q8 is grounded, the other end of the resistor R8 is connected to the collector of the transistor Q8, the base of the transistor Q8 is connected to the connecting line of the, the base electrode of the transistor Q3 is connected to the negative electrode of a diode D8, the base electrodes are respectively connected to the other end of a resistor R7, one end of a capacitor C4 is grounded and the positive electrode of a diode D6, the other end of a capacitor C4 is grounded, the base electrode of a transistor Q8 is connected to a connecting line of a resistor R8 and the collector electrode of a transistor Q4, the emitter electrode of a transistor Q8 is respectively connected to a pin 4 of a light-sensing coupler IC2, one end of a resistor R6 and one end of a buzzer Y1, a pin 3 of the light-sensing coupler IC2 is respectively connected to one end of the resistor R2 and the base electrode of the transistor Q2 through a resistor R2, the other end of the resistor R2 is grounded, the emitter electrode of the transistor Q2 is grounded, the collector electrode of the transistor Q2 is connected to the other end of the resistor R2, the other end of the buzzer Y2 is connected to the collector electrode of the transistor Q2, the base electrode of the transistor Q2 is, the emitter of the triode Q7 is grounded, and two ends of the resistor R5 are connected in parallel to the collector and the base of the triode Q8;
the relay J1 is connected in series with an AC contactor K1, and an internal protection circuit is arranged in the internal protection circuit, wherein a three-phase line A phase A1 is connected to one end of a compensation capacitor CL1 through an AC contactor normally closed switch K1-1, a three-phase line B1 is connected to a connecting line of the compensation capacitor CL1 and a compensation capacitor CL2 through an AC contactor normally closed switch K1-2, a three-phase line C phase C1 is connected to one end of a compensation capacitor CL3 through an AC contactor normally closed switch K1-3, a three-phase line A phase A2 is connected to one end of the compensation capacitor CL1 through a relay J1-1 and a resistor R13, a three-phase line B phase B1 is connected to a connecting line of the compensation capacitor CL1 and the compensation capacitor CL1 through a relay J1-2 and a resistor R1, a three-phase line C1 is connected to one end of the compensation capacitor CL1 through a relay J1 and a compensation capacitor CL1, the two ends of the compensation capacitor CL1 are connected in parallel with the, a current transformer L3 is arranged on a connecting line of an AC contactor normally-closed switch K1-1 and a compensation capacitor CL1, a current transformer L2 is arranged on a connecting line of the AC contactor normally-closed switch K1-2 connected to a connecting line of the compensation capacitor CL1 and a compensation capacitor CL2, a current transformer L1 is arranged on a connecting line of the AC contactor normally-closed switch K1-3 and the compensation capacitor CL2, the compensation capacitors CL1, CL2 and CL3 are connected in series to a pin 1 and a pin 2 of bridge rectifier diodes D9-D12, the pin 3 of the bridge rectifier diodes D9-D12 is grounded, the pin 4 is respectively connected to one end of a resistor R14 and the pin 1 of a light sensing coupler IC3 through a resistor R15, the other end of the resistor R14 is grounded, and the pin 2 of the light sensing coupler IC3 is grounded.
The working principle is as follows: firstly, the ends of L1 and N1 are connected to a 220V power supply, the three ends of A, B, C of 380V are connected to a three-phase power supply, when reactive compensation is needed, a KM1 switch is switched on, the 220V voltage is divided into two paths, one path is connected to the coil 1 end of a K1 AC contactor, the other path is subjected to voltage reduction through a C1 capacitor, a D1-D4 diode is subjected to bridge rectification and then subjected to voltage stabilization through a VD1 voltage stabilizing diode, the C2 capacitor is filtered and then outputs 24V voltage, one path is subjected to voltage reduction through an R1 resistor, the voltage is subjected to voltage stabilization through a VD2 voltage stabilizing diode and then outputs 12V, the 12V voltage is charged to a C3 capacitor through an R3 resistor, a Q1 triode is conducted, a collector output high level of the Q1 triode is conducted through an R4 resistor, a Q2 triode is conducted, a J1 is attracted, the contacts of a J1-normally closed relay are simultaneously conducted, three-phase voltage contacts of the J1, a 380V resistor and a R1 are connected to a reactive compensation capacitor, CL1 and CL2 and CL3 are charged, the charged voltage on the reactive compensation capacitor is fully charged in a short time, 12V voltage is charged to the capacitor C4 through an R7 resistor at the same time when a J1 relay works, a triode Q3 is conducted, a collector of Q3 outputs high level to the base of a triode Q4 through a resistor R10, the triode Q4 is conducted, the triode Q5 is cut off, an IC1 photocoupler does not work, K1 alternating current contact does not work, when the C4 capacitor is fully charged after a certain time, Q3 is cut off, Q4 is cut off, Q5 is conducted, an IC1 is electrically coupled and works, a K1 alternating current contactor is electrically and normally closed contacts of K1-1, K1-2 and K1-3 alternating current contactors are switched on, the reactive compensation capacitor on the voltage and the three-phase voltage are connected in parallel to work, all electric power equipment obtains capacitance compensation power, and simultaneously the Q8 is also conducted, after a certain time, the charging voltage of the C3 capacitor is full, so that the Q1 triode is cut off, the Q2 triode is cut off, the J1 relay is powered off and does not attract, and the J1-1, J1-2 and J1-3 normally closed contacts are disconnected. Therefore, the alternating current contactor is protected from being burnt out due to electric arcs generated by time heavy current charging when the reactive compensation capacitor is instantly connected. When C4 is charged, the Q8 triode is in a cut-off state while the Q4 triode is conducted, after a K1 alternating current contactor normally works, three-phase voltage flows through reactive compensation capacitors CL1, CL2 and CL3, meanwhile, about 1V alternating voltage is generated on L1, L2 and L3 current transformers, the three current transformers work in series, about 3V voltage is generated on the three current transformers, after being rectified in a D9-D12 bridge mode, about 2.5V voltage is output, after being divided by an R14 resistor and an R15 resistor, a pin 1 of an IC2 optocoupler is electrically operated, a pin 3 of an IC2 optocoupler outputs high level, the Q6 triode is conducted, the Q7 triode is cut off, a Y1 buzzer does not work, the capacity of the reactive compensation capacitors is normal, when a certain capacitor in the three-phase reactive compensation capacitors is reduced in capacity or fails, no inductive voltage transformer is output on the failed capacitor, the alternating voltage on the current transformer is reduced, the voltage output by the D9-D12 triode rectification is also reduced, so that the IC2 optocoupler cannot be powered on to work, the 3 pin of the IC2 optocoupler has no high level output, the Q6 triode is cut off, the Q7 triode is switched on, the Y1 buzzer emits light to give an alarm, the reactive power compensation is damaged, and the capacitor which needs to be replaced by a new capacitor!
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (1)

1. Electric power reactive compensation capacitance detection and ac contactor protection circuit, its characterized in that: the device comprises a zero line L1, a live line N1, a switch KM1, bridge rectifier diodes D1-D1, a light-sensitive coupler IC1, a voltage-stabilizing diode VD1, a transistor Q1, a diode D1, a relay J1, a relay normally closed contact JI-1, a relay normally closed contact JI-2, a relay normally closed contact JI-3, an AC contactor K1, an AC contactor normally closed contact K1-1, an AC contactor K1-2, an AC contactor K1-3, a normally closed contact CL1, a reactive compensation capacitor C1, a capacitor C36, A capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a buzzer Y1, a three-phase line a-phase a1, a three-phase line a-phase a2, a three-phase line B-phase B1, a three-phase line B-phase B2, a three-phase line C-phase C1, and a three-phase line C-phase C2;
the zero line L1 is respectively connected to a pin 1 of an alternating current contactor K1 through a switch KM1 and a pin 1 of bridge rectifier diodes D1-D4 through a capacitor C1, pins 4 of the bridge rectifier diodes D1-D4 are grounded, a live wire N1 is respectively connected to a pin 3 of an output of a light-sensitive coupler IC1 and pins 2 of bridge rectifier diodes D1-D4, a pin 2 of the alternating current contactor K1 is connected to a pin 4 of an input of the light-sensitive coupler IC1, pins 3 of the bridge rectifier diodes D1-D1 are respectively connected to one end of the capacitor C1, a cathode of a voltage stabilizing diode VD1, a pin 1 of the relay J1, a collector of a triode Q1 and a cathode of the voltage stabilizing diode VD1 through a resistor R1, one end of the resistor R1, a cathode of the diode D1, a cathode of the diode VD1, the other end of the capacitor C1 is grounded, a positive electrode of the voltage stabilizing diode VD1 is grounded, the anode of the zener diode VD2 is grounded, the other end of the resistor R2 is grounded, the anode of the diode D7 is connected to the other end of the resistor R3, one end of the capacitor C3 and the base of the transistor Q1, the other end of the capacitor C3 is grounded, the emitter of the transistor Q1 is connected to the cathode of the diode D5, the collector is connected to the base of the transistor Q2 via a resistor R4, the collector of the transistor Q2 is connected to the 2-pin of the relay J1, the emitter of the transistor Q2 is grounded, the 1-pin of the optical coupler IC1 is connected to one end of the resistor R9, the anode of the diode D9, one end of the resistor R9 and the cathode of the diode D9 via a resistor R9, the 2-pin of the optical coupler IC 9 is connected to the collector of the transistor Q9, the emitter of the transistor Q9 is grounded, the other end of the resistor R9 is connected to the collector of the transistor Q9, the base of the transistor Q36, the emitter of the transistor Q4 is grounded, the base is connected to the collector of the transistor Q3 through a resistor R10, the emitter of the transistor Q3 is connected to the cathode of a diode D8, the bases are respectively connected to the other end of a resistor R7, one end of a capacitor C4 is grounded, and the anode of a diode D6, the other end of a capacitor C4 is grounded, the base of the transistor Q8 is connected to the connecting line of a resistor R8 and the collector of the transistor Q4, the emitter of the transistor Q8 is respectively connected to the 4-pin of the optical sensor IC 8, one end of the resistor R8 and one end of the buzzer Y8, the 3-pin of the optical sensor IC 8 is respectively connected to one end of the resistor R8 and the base of the transistor Q8, the other end of the resistor R8 is grounded, the emitter of the transistor Q8 is grounded, the collector of the transistor Q8 is connected to the other end of the resistor R8, the other end of the buzzer Y8 is connected to the transistor Q8, the base of the transistor Q8, the emitter of the triode Q7 is grounded, and two ends of the resistor R5 are connected in parallel to the collector and the base of the triode Q8;
the relay J1 is connected with the alternating current contactor K1 in series, and an internal protection circuit is arranged inside the relay J1;
in the internal protection circuit, a three-phase line A1 is connected to one end of a compensation capacitor CL1 through an alternating current contactor normally closed switch K1-1, a three-phase line B1 is connected to a connecting line of a compensation capacitor CL1 and a compensation capacitor CL2 through an alternating current contactor normally closed switch K1-2, a three-phase line C1 is connected to one end of a compensation capacitor CL3 through an alternating current contactor normally closed switch K1-3, a three-phase line A2 is connected to one end of the compensation capacitor CL 13 through a relay J1-1 and a resistor R13, a three-phase line B13 is connected to a connecting line of the compensation capacitor CL 72 and the compensation capacitor CL 72 through a relay J13-2 and a resistor R13, a three-phase line C13 is connected to one end of the compensation capacitor CL 13 through a relay J13-3 and a resistor R13, the compensation capacitor CL 13 is connected in parallel to two ends of the compensation capacitor CL 13 and a current transformer is arranged on the connecting line of the alternating current contactor normally closed switch K13-1 and the compensation capacitor CL 72. A current transformer L2 is arranged on a connecting line of an AC contactor normally closed switch K1-2 connected to a connecting line of a compensation capacitor CL1 and a compensation capacitor CL2, a current transformer L1 is arranged on a connecting line of an AC contactor normally closed switch K1-3 and a compensation capacitor CL2, compensation capacitors CL1, CL2 and CL3 are connected in series to a pin 1 and a pin 2 of a bridge rectifier diode D9-D12, a pin 3 of the bridge rectifier diode D9-D12 is grounded, a pin 4 is respectively connected to one end of a resistor R14 and the pin 1 of a light sensing coupler IC3 through a resistor R15, the other end of the resistor R14 is grounded, and a pin 2 of the light sensing coupler IC3 is grounded.
CN201810967061.3A 2018-08-23 2018-08-23 Electric power reactive compensation capacitor detection and alternating current contactor protection circuit Active CN109066713B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2442437Y (en) * 2000-09-01 2001-08-08 刘建新 One group silicon controlled reactifier projection and switch multiway capacitance compensator
CN2686182Y (en) * 2003-05-20 2005-03-16 陈建荣 Adier capacitance compensation digital controlled projecting and switching device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009510984A (en) * 2005-09-26 2009-03-12 ▲鋭▼添 ▲蘇▼ Energy-saving device with intelligent reactive power automatic compensation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2442437Y (en) * 2000-09-01 2001-08-08 刘建新 One group silicon controlled reactifier projection and switch multiway capacitance compensator
CN2686182Y (en) * 2003-05-20 2005-03-16 陈建荣 Adier capacitance compensation digital controlled projecting and switching device

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