CN212543680U - Mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter - Google Patents
Mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter Download PDFInfo
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- CN212543680U CN212543680U CN202021798133.5U CN202021798133U CN212543680U CN 212543680 U CN212543680 U CN 212543680U CN 202021798133 U CN202021798133 U CN 202021798133U CN 212543680 U CN212543680 U CN 212543680U
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Abstract
The invention discloses a mining explosion-proof and intrinsic safety type vacuum combined alternating-current soft starter, relates to a soft starter, and aims to solve the problem that the existing double-speed starting controller cannot realize heavy-load soft starting of a double-speed starter, and the mining explosion-proof and intrinsic safety type vacuum combined alternating-current soft starter comprises a low-speed soft starting loop, a high-speed soft starting loop and a processor; the low-speed soft start loop comprises a low-speed pilot loop, a low-speed intermediate loop and a low-speed contactor loop; the high-speed soft start circuit comprises a high-speed pilot circuit, a high-speed intermediate circuit and a high-speed contactor circuit.
Description
Technical Field
The invention relates to a soft starter, in particular to a soft starter started by double-speed frequency division.
Background
The existing double-speed starting controller can not effectively improve the torque only by the voltage regulating and current limiting functions due to no double-speed frequency division starting, can not realize the heavy-load soft starting of the double-speed starter, has the problem of larger starting current, has larger mechanical impact, and can not normally run under heavy load.
Disclosure of Invention
The invention aims to solve the problem that the existing double-speed starting controller cannot realize heavy-load soft starting of a double-speed starter, and provides a mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter.
The invention discloses a mining explosion-proof and intrinsic safety type vacuum combined alternating-current soft starter which comprises a low-speed soft starting loop, a high-speed soft starting loop and a processor, wherein the low-speed soft starting loop is connected with the processor;
the low-speed soft start loop comprises a low-speed pilot loop, a low-speed intermediate loop and a low-speed contactor loop;
the low-speed pilot circuit comprises a switching device XD1 and a switch QA1, wherein a pin A3 and a pin B3 of the switching device XD1 are electrically connected with a low-speed pilot circuit power supply; and switch QA1 is electrically connected between pin a6 and pin B6 of switching device XD1, when switch QA1 is closed, the normally open contact of switching device XD1 is closed;
the low-speed intermediate circuit comprises a main circuit intermediate relay ZJ11 and a bypass intermediate relay ZJ12, and a coil of the main circuit intermediate relay ZJ11 is electrically connected with a low-speed intermediate circuit power supply through a normally open contact of a switching device XD 1; the coil of the bypass intermediate relay ZJ12 is electrically connected with the low-speed intermediate circuit power supply through a first normally-open contact of the main circuit intermediate relay ZJ 11;
the low-speed contactor loop comprises a low-speed starting contactor KM11 and a low-speed full-voltage starting contactor KM12, wherein the low-speed starting contactor KM11 is electrically connected with a low-speed contactor loop power supply through a second normally open contact of a main loop intermediate relay ZJ 11; the low-speed full-voltage starting contactor KM12 is electrically connected with a low-speed contactor loop power supply through a normally open contact of a bypass intermediate relay ZJ 12;
the low-speed starting end of the motor is electrically connected with a motor power supply through a normally open contact of a low-speed starting contactor KM11, and the low-speed full-voltage starting end of the motor is electrically connected with the motor power supply through a normally open contact of a low-speed full-voltage starting contactor KM 12;
the high-speed soft start loop comprises a high-speed pilot loop, a high-speed intermediate loop and a high-speed contactor loop;
the high-speed pilot loop comprises a switching device XD2 and a switch QA2, wherein a pin A3 and a pin B3 of the switching device XD2 are electrically connected with a high-speed pilot loop power supply; and switch QA2 is electrically connected between pin a6 and pin B6 of switching device XD2, when switch QA2 is closed, the normally open contact of switching device XD2 is closed; the online signal input end of the normally open contact of the switch device XD2 is electrically connected with the online signal output end of the processor, and the online signal input end of the processor is electrically connected with the online signal output end of the normally open contact of the switch device XD 1;
the high-speed intermediate circuit comprises a main circuit intermediate relay ZJ21, an auxiliary intermediate relay ZJ21A and a bypass intermediate relay ZJ22, and a coil of the main circuit intermediate relay ZJ21 and a coil of the auxiliary intermediate relay ZJ21A are electrically connected with a low-speed intermediate circuit power supply through a normally-open contact of a switching device XD 2; the coil of the bypass intermediate relay ZJ22 is electrically connected with the low-speed intermediate loop power supply through a first normally-open contact of the auxiliary intermediate relay ZJ 21A;
the high-speed contactor loop comprises a high-speed starting contactor KM21 and a high-speed full-voltage starting contactor KM22, wherein the high-speed starting contactor KM21 is electrically connected with a high-speed contactor loop power supply through a first normally open contact of a main loop intermediate relay ZJ 21; the high-speed full-voltage starting contactor KM22 is electrically connected with a high-speed contactor loop power supply through a first normally open contact of a bypass intermediate relay ZJ 22;
the first normally closed contact of the main circuit intermediate relay ZJ21 and the first normally closed contact of the bypass intermediate relay ZJ22 are connected in series between the coil of the low-speed starting contactor KM11 and the low-speed contactor circuit power supply; the second normally closed contact of the main circuit intermediate relay ZJ21 and the second normally closed contact of the bypass intermediate relay ZJ22 are both connected in series between the coil of the low-speed full-voltage starting contactor KM12 and the low-speed contactor circuit power supply;
the high-speed starting end of the motor is electrically connected with a motor power supply through a normally open contact of the high-speed starting contactor KM21, and the high-speed full-voltage starting end of the motor is electrically connected with the motor power supply through a normally open contact of the high-speed full-voltage starting contactor KM 22.
The invention has the beneficial effects that:
the low-speed and high-speed heavy-load soft start function is added on the basis of the original double-speed starter. The starting mode of the mining double-loop frequency division soft start protector adopts a voltage time slope mode and a starting current limiting function, and has a frequency modulation soft start function. The starting current is small, the double-speed starting speed is stably improved, and the starting torque of the double-speed motor can be effectively improved. The problems that a conventional double-speed starter has no soft start function, heavy-load starting is difficult, starting current is large and the starter is unstable are solved. Meanwhile, the impact of the overlarge starting torque generated by direct starting or star/angle starting on a power grid is reduced, and the impact on a mechanical transmission system when the motor is started is reduced.
Drawings
FIG. 1 is an electrical schematic diagram of the mining flameproof and intrinsically safe vacuum combined AC soft starter of the present invention;
FIG. 2 is a schematic diagram of a circuit topology structure of the mining flameproof and intrinsically safe vacuum combined AC soft starter of the present invention;
fig. 3 is a schematic diagram of a circuit topology structure in which the motor is electrically connected to a power supply through a thyristor according to the present invention (including the normally open contact of KM11, the normally open contact of KM12, the normally open contact of KM21, and the normally open contact of KM 22);
fig. 4 is a schematic diagram of a circuit topology of the pilot assembly of the present invention;
fig. 5 is a schematic view of the matching structure of the thyristor assembly and the starter core frame of the present invention.
Detailed Description
In a first specific embodiment, the mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter comprises a low-speed soft starting loop 1, a high-speed soft starting loop 2 and a processor 3;
the low-speed soft start loop 1 comprises a low-speed pilot loop 1-1, a low-speed intermediate loop 1-2 and a low-speed contactor loop 1-3;
the low-speed pilot circuit 1-1 comprises a switching device XD1 and a switch QA1, wherein a pin A3 and a pin B3 of the switching device XD1 are electrically connected with a low-speed pilot circuit power supply; and switch QA1 is electrically connected between pin a6 and pin B6 of switching device XD1, when switch QA1 is closed, the normally open contact of switching device XD1 is closed;
the low-speed intermediate circuit 1-2 comprises a main circuit intermediate relay ZJ11 and a bypass intermediate relay ZJ12, wherein a coil of the main circuit intermediate relay ZJ11 is electrically connected with a low-speed intermediate circuit power supply through a normally open contact of a switch device XD 1; the coil of the bypass intermediate relay ZJ12 is electrically connected with the low-speed intermediate circuit power supply through a first normally-open contact of the main circuit intermediate relay ZJ 11;
the low-speed contactor loop 1-3 comprises a low-speed starting contactor KM11 and a low-speed full-voltage starting contactor KM12, wherein the low-speed starting contactor KM11 is electrically connected with a low-speed contactor loop power supply through a second normally open contact of a main loop intermediate relay ZJ 11; the low-speed full-voltage starting contactor KM12 is electrically connected with a low-speed contactor loop power supply through a normally open contact of a bypass intermediate relay ZJ 12;
the low-speed starting end of the motor is electrically connected with a motor power supply through a normally open contact of a low-speed starting contactor KM11, and the low-speed full-voltage starting end of the motor is electrically connected with the motor power supply through a normally open contact of a low-speed full-voltage starting contactor KM 12;
the high-speed soft start loop 2 comprises a high-speed pilot loop 2-1, a high-speed intermediate loop 2-2 and a high-speed contactor loop 2-3;
the high-speed pilot circuit 2-1 comprises a switching device XD2 and a switch QA2, wherein a pin A3 and a pin B3 of the switching device XD2 are electrically connected with a high-speed pilot circuit power supply; and switch QA2 is electrically connected between pin a6 and pin B6 of switching device XD2, when switch QA2 is closed, the normally open contact of switching device XD2 is closed; the online signal input end of the normally open contact of the switch device XD2 is electrically connected with the online signal output end of the processor 3, and the online signal input end of the processor 3 is electrically connected with the online signal output end of the normally open contact of the switch device XD 1;
the high-speed intermediate circuit 2-2 comprises a main circuit intermediate relay ZJ21, an auxiliary intermediate relay ZJ21A and a bypass intermediate relay ZJ22, wherein a coil of the main circuit intermediate relay ZJ21 and a coil of the auxiliary intermediate relay ZJ21A are both electrically connected with a low-speed intermediate circuit power supply through a normally-open contact of a switching device XD 2; the coil of the bypass intermediate relay ZJ22 is electrically connected with the low-speed intermediate loop power supply through a first normally-open contact of the auxiliary intermediate relay ZJ 21A;
the high-speed contactor loop 2-3 comprises a high-speed starting contactor KM21 and a high-speed full-voltage starting contactor KM22, wherein the high-speed starting contactor KM21 is electrically connected with a high-speed contactor loop power supply through a first normally open contact of a main loop intermediate relay ZJ 21; the high-speed full-voltage starting contactor KM22 is electrically connected with a high-speed contactor loop power supply through a first normally open contact of a bypass intermediate relay ZJ 22;
the first normally closed contact of the main circuit intermediate relay ZJ21 and the first normally closed contact of the bypass intermediate relay ZJ22 are connected in series between the coil of the low-speed starting contactor KM11 and the low-speed contactor circuit power supply; the second normally closed contact of the main circuit intermediate relay ZJ21 and the second normally closed contact of the bypass intermediate relay ZJ22 are both connected in series between the coil of the low-speed full-voltage starting contactor KM12 and the low-speed contactor circuit power supply;
the high-speed starting end of the motor is electrically connected with a motor power supply through a normally open contact of the high-speed starting contactor KM21, and the high-speed full-voltage starting end of the motor is electrically connected with the motor power supply through a normally open contact of the high-speed full-voltage starting contactor KM 22.
In this embodiment, the low-voltage self-protection circuit includes a third normally-open contact of ZJ11, and the third normally-open contact of ZJ11 is connected in parallel with the switch QA1 and is electrically connected between the pin a6 and the pin B6 of the switching device XD 1.
In this embodiment, the high-voltage self-protection circuit includes a second normally open contact of ZJ21, and the second normally open contact of ZJ21 is connected in parallel with the switch QA2 and is electrically connected between the pin a6 and the pin B6 of the switching device XD 2.
The above embodiments are specifically explained, the mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter of the utility model is suitable for the coal mine and the explosive gas environment containing methane and coal dust mixture in the surrounding medium, and can be used in the lines of alternating current 50HZ, voltage 1140V or 660V, rated total current 1200A, single-loop maximum current 600A and below, so that two independent soft starting loops can be formed, and online double-loop soft starting and double-speed soft starting can be formed to perform soft starting and soft parking control on a three-phase alternating-current asynchronous (including double-speed) motor.
The speed raising mode (time, current) and corresponding parameters are set before starting, such as low-speed bypass time: bypassing the operation time after the low-speed soft start is finished; switching the current: after the low-speed starting is finished, the current is decreased to a set value; switching time: waiting for the time of high-speed starting after the low speed meets the switching condition; double-speed starting delay time; the setting modes of time delay switching time and the like are determined according to actual needs and are stored in a double-loop frequency division soft start protector with the processor 3 model number of RJB-07MFDdyt, the processor 3 judges the time through an external or self-built-in clock, and the current and voltage are recorded and judged by connecting current and voltage acquisition ends of a low-speed soft start loop 1 and a high-speed soft start loop 2 into self pins. Meanwhile, a plurality of relay control signal input ends of the processor 3 are respectively and electrically connected with the relay control signal input ends in the low-speed soft start circuit 1 and the high-speed soft start circuit 2, and are used for correspondingly controlling the relays in a coil power-on state, such as time delay and the like.
The specific starting sequence is as follows:
as shown in fig. 2 and 3, pressing QA1 → the coil of ZJ11 is electrified → the normally open contact of ZJ11 is closed → the coil of KM11 is electrified → the normally open contact of KM11 is closed → the low-speed motor is soft started, and meanwhile, ZJ11 assists the normally open contact (ZJ11A) to be closed (ZJ11 assists the normally open contact to be connected with QA1 in parallel) → XD1 self-protection; in a set time (set in the setting process), the normally open contact of the ZJ12 is attracted → the coil of the KM12 is electrified → the normally open contact of the KM12 is attracted → the motor runs at low speed and full pressure.
The online point of the high-speed loop is closed → the coil of the ZJ21 is electrified → the normally open contact of the ZJ21 is closed → the coil of the KM21 is electrified (the coil of the KM11 is electrified) → the low-speed motor is stopped within a set time (set in the setting process) or within a set current range (which can be set to 0.8-1.2Ie), and the high-speed motor is soft started (generally, the starting voltage is higher, and the low speed motor is started). Meanwhile, the normally open contact attraction of the ZJ21A realizes the XD2 self-protection. Normally open contact pull-in of ZJ22 → normally open contact pull-in of KM22 → high speed full pressure operation in a set time.
In addition, the general fault diagnosis on the original circuit design of the starter is simple and unreliable, and the maintenance difficulty is increased. The processor 3 can not effectively guide the line maintenance on the original line design and can not accurately diagnose the type and the position of the fault, so that the maintenance fault only depends on the experience of maintenance personnel, and the maintenance efficiency and the maintenance quality are not high
Therefore, in order to realize fault judgment, normally open contacts of XD1(XD2), ZJ11(ZJ21) and KM12(KM22) are respectively led into a 14-a 15, a 16-a 17 and A8-a 9 (or other pins with the same function) of the processor 3 to be used as fault feedback signal ends for inputting fault feedback signals, so that an automatic monitoring function (monitoring voltage and current) is added, new monitoring fault points are added, therefore, the signal feedback loops are automatically judged at the same time, the judgment does not affect the normal work of the controller, and only fault content is displayed after normal shutdown to prompt a user to overhaul. The automatic judgment is that in the starting and running processes, the processor 3 detects the working state of the low-speed/high-speed pilot loop, the low-speed/high-speed intermediate loop and the low-speed/telling contactor loop are normally started and run when no fault exists, and corresponding fault content can be displayed on the human-computer interaction interface and stopped starting and running, waiting for processing and manual reset when the fault exists.
For example, when the "start" button is pressed for 5 seconds without being activated and the display content is unchanged, it is determined that "the pilot circuit XD1 is faulty", the pilot circuit XD1 is checked, and the activation is continued after the repair.
When the starting circuit ZJ11 has a fault, it displays "starting circuit fault", the ZJ11 circuit should be checked for power failure, and the starting is continued after repair.
When the contactor circuit KM12 has a fault, the 'contactor circuit fault' is displayed, the KM12 circuit is checked to be powered off, and the contactor circuit KM12 can be used normally after being repaired.
Best example, this example is a further description of the first embodiment, in this example, the first normally closed contact of KM11 and the first normally closed contact of KM12 are both connected in series between the coil of KM21 and the high-speed contactor loop power supply; the second normally closed contact of KM11 and the second normally closed contact of KM12 were both connected in series between the coil of KM22 and the high speed contactor loop power supply.
Specifically, the coil of KM11 was energized → the first/second normally closed contact of KM11 was opened → the coil of KM21 was not energized, and the same applies to KM 12.
The conflict between the low-speed running and the high-speed running of the motor is avoided.
In addition, the existing motor is usually electrically connected with a power supply through a silicon controlled assembly, but in the existing mechanical structure design, the silicon controlled assembly is generally arranged on a body core frame and needs to be insulated and isolated from a shell, so that the installation and maintenance are inconvenient, the heat dissipation efficiency is low, and the motor is often damaged due to the low heat dissipation efficiency;
as shown in figure 5, the silicon controlled rectifier component is directly arranged on the core frame 9 in the shell of the whole machine, so that the installation is convenient, the heat dissipation efficiency is improved, and the service life of the silicon controlled rectifier component is prolonged.
Further, as shown in fig. 4, both the switching device XD1 and the switching device XD2 are pilot assemblies;
the pilot assembly comprises an isolation transformer 4, a rectifier bridge 5, a voltage stabilizer 6, an optocoupler 7, a triode 8, a contactor K1, a contactor K2 and a contactor K3;
the pin A3 is electrically connected with one end of the primary coil of the isolation transformer 4 and one alternating voltage input end of the rectifier bridge 5; the pin B3 is electrically connected with the other end of the primary coil of the isolation transformer 4 and the other alternating voltage input end of the rectifier bridge 5;
one end of a secondary coil of the isolation transformer 4 is electrically connected with an A6 pin, and the other end of the secondary coil is electrically connected with the cathode of a light emitting diode in the optical coupler 7; the anode of the light emitting diode in the optical coupler 7 is electrically connected with a pin B6;
the direct-current positive voltage output end of the rectifier bridge 5 is electrically connected with the voltage input end of the voltage stabilizer 6, and the direct-current negative voltage output end of the rectifier bridge 5 is grounded;
the voltage output end of the voltage stabilizer 6 is electrically connected with one end of a coil of the contactor K1, one end of a coil of the contactor K2 and one end of a coil of the contactor K3 through a first normally-open contact K1-1 of the contactor K1;
the other end of the coil of the contactor K2 is grounded through a first normally open contact K3-1 of a contactor K3; the other end of the coil of the contactor K3 is grounded;
the collector of the light receiver in the optical coupler 7 is electrically connected with one end of the coil of the contactor K1 at the same time, and is electrically connected with one end of the coil of the contactor K3 through a first normally open contact K1-1 of the contactor K1;
an emitting electrode of a light receiver in the optocoupler 7 is electrically connected with a base electrode of the triode 8; the collector of the triode 8 is electrically connected with the other end of the coil of the contactor K1, and the emitter is grounded;
the second normally open contact K1-2 of the contactor K1 and the second normally open contact K3-2 of the contactor K3 are both used as normally open contacts of the XD pilot assembly, the second normally open contact K1-2 is connected between the pin A1 and the pin A2 in series, and the second normally open contact K3-2 is connected between the pin B1 and the pin B2 in series.
Wherein, the voltage stabilizer 6 is a 7812 voltage stabilizing circuit; the optical coupler 7 is a 2501 photoelectric coupler; the triode 8 is a 9013 triode.
The processor 3 is led in by a normally open contact to be used as an online signal sending end.
Claims (6)
1. The mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter is characterized by comprising a low-speed soft starting loop (1), a high-speed soft starting loop (2) and a processor (3);
the low-speed soft starting loop (1) comprises a low-speed pilot loop (1-1), a low-speed intermediate loop (1-2) and a low-speed contactor loop (1-3);
the low-speed pilot circuit (1-1) comprises a switching device XD1 and a switch QA1, wherein a pin A3 and a pin B3 of the switching device XD1 are electrically connected with a low-speed pilot circuit power supply; and said switch QA1 is electrically connected between pin a6 and pin B6 of said switching device XD1, when switch QA1 is closed, the normally open contact of switching device XD1 is closed;
the low-speed intermediate circuit (1-2) comprises a main circuit intermediate relay ZJ11 and a bypass intermediate relay ZJ12, and a coil of the main circuit intermediate relay ZJ11 is electrically connected with a low-speed intermediate circuit power supply through a normally-open contact of a switching device XD 1; the coil of the bypass intermediate relay ZJ12 is electrically connected with the low-speed intermediate circuit power supply through a first normally-open contact of the main circuit intermediate relay ZJ 11;
the low-speed contactor loop (1-3) comprises a low-speed starting contactor KM11 and a low-speed full-voltage starting contactor KM12, wherein the low-speed starting contactor KM11 is electrically connected with a low-speed contactor loop power supply through a second normally-open contact of a main loop intermediate relay ZJ 11; the low-speed full-voltage starting contactor KM12 is electrically connected with a low-speed contactor loop power supply through a normally open contact of a bypass intermediate relay ZJ 12;
the low-speed starting end of the motor is electrically connected with a motor power supply through a normally open contact of a low-speed starting contactor KM11, and the low-speed full-voltage starting end of the motor is electrically connected with the motor power supply through a normally open contact of a low-speed full-voltage starting contactor KM 12;
the high-speed soft starting loop (2) comprises a high-speed pilot loop (2-1), a high-speed intermediate loop (2-2) and a high-speed contactor loop (2-3);
the high-speed pilot circuit (2-1) comprises a switching device XD2 and a switch QA2, wherein a pin A3 and a pin B3 of the switching device XD2 are electrically connected with a high-speed pilot circuit power supply; and said switch QA2 is electrically connected between pin a6 and pin B6 of said switching device XD2, when switch QA2 is closed, the normally open contact of switching device XD2 is closed; the online signal input end of the normally open contact of the switch device XD2 is electrically connected with the online signal output end of the processor (3), and the online signal input end of the processor (3) is electrically connected with the online signal output end of the normally open contact of the switch device XD 1;
the high-speed intermediate circuit (2-2) comprises a main circuit intermediate relay ZJ21, an auxiliary intermediate relay ZJ21A and a bypass intermediate relay ZJ22, and a coil of the main circuit intermediate relay ZJ21 and a coil of the auxiliary intermediate relay ZJ21A are both electrically connected with a low-speed intermediate circuit power supply through a normally-open contact of a switching device XD 2; the coil of the bypass intermediate relay ZJ22 is electrically connected with the low-speed intermediate loop power supply through a first normally-open contact of the auxiliary intermediate relay ZJ 21A;
the high-speed contactor circuit (2-3) comprises a high-speed starting contactor KM21 and a high-speed full-voltage starting contactor KM22, wherein the high-speed starting contactor KM21 is electrically connected with a high-speed contactor circuit power supply through a first normally open contact of a main circuit intermediate relay ZJ 21; the high-speed full-voltage starting contactor KM22 is electrically connected with a high-speed contactor loop power supply through a first normally open contact of a bypass intermediate relay ZJ 22;
the first normally closed contact of the main circuit intermediate relay ZJ21 and the first normally closed contact of the bypass intermediate relay ZJ22 are connected in series between the coil of the low-speed starting contactor KM11 and the low-speed contactor circuit power supply; the second normally closed contact of the main circuit intermediate relay ZJ21 and the second normally closed contact of the bypass intermediate relay ZJ22 are both connected in series between the coil of the low-speed full-voltage starting contactor KM12 and the low-speed contactor circuit power supply;
the high-speed starting end of the motor is electrically connected with a motor power supply through a normally open contact of the high-speed starting contactor KM21, and the high-speed full-voltage starting end of the motor is electrically connected with the motor power supply through a normally open contact of the high-speed full-voltage starting contactor KM 22.
2. The mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter of claim 1, characterized by further comprising a low-voltage self-protection circuit, wherein the low-voltage self-protection circuit comprises a third normally-open contact of a main circuit intermediate relay ZJ11, and the third normally-open contact of the main circuit intermediate relay ZJ11 is connected in parallel with a switch QA1 and is electrically connected between a pin A6 and a pin B6 of the switching device XD 1.
3. The mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter as claimed in claim 1 or 2, characterized by further comprising a high-voltage self-protection circuit, wherein the high-voltage self-protection circuit comprises a second normally-open contact of a main circuit intermediate relay ZJ21, the second normally-open contact of the main circuit intermediate relay ZJ21 is connected with a switch QA2 in parallel, and is electrically connected between a pin A6 and a pin B6 of the switching device XD 2.
4. The mining flameproof and intrinsically safe vacuum combined AC soft starter according to claim 1,
the first normally closed contact of the low-speed starting contactor KM11 and the first normally closed contact of the low-speed full-voltage starting contactor KM12 are connected in series between the coil of the high-speed starting contactor KM21 and a high-speed contactor loop power supply; the second normally closed contact of the low-speed starting contactor KM11 and the second normally closed contact of the low-speed full-pressure starting contactor KM12 are connected in series between the coil of the high-speed full-pressure starting contactor KM22 and the high-speed contactor loop power supply.
5. The mining flameproof and intrinsically safe vacuum combined AC soft starter according to claim 1,
the switch device XD1 and the switch device XD2 are pilot assemblies;
the pilot assembly comprises an isolation transformer (4), a rectifier bridge (5), a voltage stabilizer (6), an optocoupler (7), a triode (8) and a contactor K1Contactor K2And contactor K3；
The A3 pin is electrically connected with one end of the primary coil of the isolation transformer (4) and one alternating voltage input end of the rectifier bridge (5) at the same time; the pin B3 is electrically connected with the other end of the primary coil of the isolation transformer (4) and the other alternating voltage input end of the rectifier bridge (5) at the same time;
one end of a secondary coil of the isolation transformer (4) is electrically connected with the pin A6, and the other end of the secondary coil of the isolation transformer is electrically connected with the cathode of the light emitting diode in the optical coupler (7); the anode of a light emitting diode in the optical coupler (7) is electrically connected with a pin B6;
the direct-current positive voltage output end of the rectifier bridge (5) is electrically connected with the voltage input end of the voltage stabilizer (6), and the direct-current negative voltage output end of the rectifier bridge (5) is grounded;
the voltage output end of the voltage stabilizer (6) is simultaneously connected with the contactor K1Is electrically connected to one end of the coil and is connected to the contactor K2Is electrically connected to one end of the coil, and through a contactor K1First normally open contact K1-1And contactor K3One end of the coil of (a) is electrically connected;
contactor K2The other end of the coil passes through a contactor K3First normally open contact K3-1Grounding; contactor K3The other end of the coil is grounded;
the collector of the light receiver in the optical coupler (7) is simultaneously connected with the contactor K1Is electrically connected to one end of the coil, and through a contactor K1First normally open contact K1-1And contactor K3One end of the coil of (a) is electrically connected;
an emitting electrode of a light receiver in the optical coupler (7) is electrically connected with a base electrode of the triode (8); collector of triode (8) and contactor K1The other end of the coil is electrically connected, and the emitting electrode is grounded;
contactor K1Second normally open contact K1-2And contactor K3Second normally open contact K3-2Both as normally open contacts of XD pilot assembly, and a second normally open contact K1-2A second normally open contact K connected in series between the pin A1 and the pin A23-2Connected in series between the pin B1 and the pin B2.
6. The mining flameproof and intrinsically safe vacuum combined AC soft starter according to claim 5,
the voltage stabilizer (6) is a 7812 voltage stabilizing circuit;
the optical coupler (7) is a 2501 photoelectric coupler;
the triode (8) is a 9013 triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021798133.5U CN212543680U (en) | 2020-08-25 | 2020-08-25 | Mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter |
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|---|---|---|---|
| CN202021798133.5U CN212543680U (en) | 2020-08-25 | 2020-08-25 | Mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter |
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| CN212543680U true CN212543680U (en) | 2021-02-12 |
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|---|---|---|---|
| CN202021798133.5U Active CN212543680U (en) | 2020-08-25 | 2020-08-25 | Mining explosion-proof and intrinsically safe vacuum combined alternating-current soft starter |
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2020
- 2020-08-25 CN CN202021798133.5U patent/CN212543680U/en active Active
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