RU105874U1 - ELECTRIC DRIVE CONTROL DEVICE - Google Patents

Abstract

 A switchgear control device containing three line wires, a three-phase electric motor drive and a circuit breaker with control and working contacts, a polarized start relay and a neutral start relay with a field winding and a hold winding, one and the other unipolar switch control relays with working windings and polarizing windings, phase control unit with terminals for connecting one, another and third phases of a three-phase alternating current, with one, other and third terminals for connected three-phase load and terminals for connecting a relay, control computer complex (UVK) of a microprocessor centralization system with test terminals for closing and opening contacts and terminals for entering information about the plus and minus positions of the arrow, relay switch box for switching the arrow to plus, minus position, transformers, diodes , capacitors, resistors, sources of direct, alternating and three-phase alternating currents, characterized in that the field winding of the neutral starting relay is connected at one end to to the opposite pole of the direct current source, and the other end to the other pole of this source, through a series-connected one normally closed contact of a polarized start relay, one normally open contact of the relay to switch the arrow to the plus position, one make contact to the relay to switch the arrows to the negative position, in parallel to which are connected in series one normally open contact of a polarized start relay, another make contact to put the arrow in the positive position, another open

Description

The utility model relates to the field of electrical engineering and can be used in signaling, centralization and blocking devices (SSC) in railway transport.

A control device for a turnout electric drive is known, comprising three line wires, an electric drive with a three-phase electric motor and an auto switch with control and working contacts, polarized and neutral start-up relays, one and the other unipolar arrow control relays, an arrow position control relay, a phase control unit with leads for connecting one , other and third phases of three-phase alternating current, with one, another and third terminals for connecting a three-phase load and terminals for connecting relays, transfo romators, diodes, capacitors, resistors, sources of direct, alternating and three-phase alternating currents (see 1).

This device is adopted as a prototype, as the closest to the proposed in its technical essence.

The disadvantages of the opposed device during its operation as part of a microprocessor centralization system are:

- low reliability due to the actuation of the switch control relay through its NC contact;

- the high cost of the device due to the large number of relays and capacitors used;

- the high cost of the device due to the high cost of the arrow control relay due to the use of three windings in these relays;

- high power consumption by the polarizing windings of the switch control relay due to the low electrical resistance of these windings, due to the use of three windings in these relays.

The tasks to which the present utility model is directed is to eliminate the indicated disadvantages of the known device.

The solution to these problems is achieved by the fact that the excitation winding of the neutral start relay is connected at one end to one pole of the DC source, and the other end to the other pole of this source through one normally closed contact of the polarized start relay, one opening contact of the relay to switch the arrow to the positive position , one make contact of the relay switch of an arrow in a minus position, in parallel with which one normally open contact is connected in series a polarized start relay, another make contact of the arrow switch to the plus position, another make contact of the switch to switch the arrow to the minus position, while the parallel connected polarizing windings of one and the other control relay arrows are connected at one end to the other pole of the DC source through one normally closed contact of the polarized the starting relay and through one resistor are connected to one pole of this DC source, and the other end through one normally open con the cycle of the polarized start relay is connected to the other pole of the DC source and connected to one pole of this DC source through a different resistor, while the test terminal of the UVK NC contact is connected to the input terminal of information in the UVK about the negative position of the arrow through one NC contact of one arrow monitoring relay parallel to which one make contact of this relay is connected, connected via series-connected one make contact of another control relay arrows and another the normally open contact of the polarized start relay to the test terminal of the UVK make contact, while the test terminal of the UVK make contact is connected to the input terminal of information in the UVK about the positive position of the arrow through another open contact of one monitoring relay, in parallel with which another make contact of this relay is connected, connected through connected in series with another make contact of another control relay arrows and another normally closed contact of a polarized start relay to the test terminal ayuschego contact UCMJ.

In the proposed device, an increase in reliability is achieved due to the exclusion of the relay control relay operation through its NC contact.

In the proposed device, a reduction in the cost of the device is achieved by reducing the number of relays and capacitors and by reducing the cost of the relay control arrows due to a decrease in the number of windings in these relays.

In the proposed device, a reduction in power consumption by the polarizing windings of the arrow monitoring relay is achieved due to an increase in their electrical resistance due to a decrease in the number of windings of these relays.

The proposed technical solution is new, because three wire devices for controlling an alternating current electric drive without a reversing relay are not known in the prior art, in which the excitation winding of the neutral starting relay is connected at one end to one pole of the DC source, and the other end to the other pole of this source through one normally closed contact connected in series polarized start relay, one normally open contact of the relay to switch the arrow to the positive position, one make contact of the relay to switch the arrow to the negative position, in parallel with which one normally open contact of the polarized start relay is connected, the other make contact of the arrow switch to the plus position, the other make contact of the arrow switch to the minus position, while the polarizing windings of one and the other arrow control relay are connected in parallel at one end connected to the other pole of the DC source through one normally closed contact of the polarized start relay and through one cut the source is connected to one pole of this direct current source, and the other end is connected to the other side of the direct current source through one normally open contact of the polarized start relay and connected to the other end of this direct current source through the other resistor, while the test terminal of the NC contact is connected to terminal for information input in UVK about the negative position of the arrow through one opening contact of one relay of control of the arrow, in parallel with which one closing contact of this arrow is connected a relay connected through one make contact of the other control relay arrows and another normally open contact of the polarized start relay to the test terminal of the UVK make contact, while the test terminal of the UVK make contact is connected to the input terminal of information in the UVK about the positive position of the arrow through another open contact one monitoring relay, in parallel with which another NO contact of this relay is connected, connected through a series of other NO contacts another arrow monitoring relay and another normally closed contact of the polarized start relay to the test terminal of the UVK make contact. The proposed technical solution is industrially applicable, because when using it, a technical result is obtained in the form of an increase in reliability due to the exclusion of the operation of the arrow monitoring relay through its opening contact, as well as in the form of a reduction in cost by reducing the number of relays and capacitors and a decrease in the cost of the arrow monitoring relay, as well as a reduction in power consumption due to increase the electrical resistance of the polarizing windings of the control relay arrows.

From the above it follows that the proposed technical solution meets the requirements for a utility model.

An example of a variant of the proposed three-wire control device arrow AC electric drive shown in figure 1.

The diagram of a three-wire device for controlling an alternating current electric drive (see Fig. 1) contains a control computer complex (UVK) 1 of a microprocessor centralization system with test terminals for make contacts 1.1 and test for open contacts 1.2, input terminals for information on plus 1.3 and minus 1.4 arrow positions , a relay block 2, containing a relay to switch the arrow to the plus position 2.1 and its contacts 2.1.1, 2.1.2, 2.1.3 and a relay to switch the arrow to the negative position 2.2 and its contacts 2.2.1, 2.2.2, 2.2.3 ( Fig. 1 diagram of the inclusion of the coil current of these relays is not shown), two polarized winding start relay 3 and its contacts 3.1, 3.2, 3.3, 3.4, neutral start relay 4 with excitation winding 4.1 and holding winding 4.2 and its contacts 4.3, 4.4, 4.5, 4.6, one unipolar relay control arrows 5 with working 5.1 and polarizing 5.2 windings and its contacts 5.3, 5.4 and other unipolar relay control arrows 6 with working 6.1 and polarizing 6.2 windings and its contacts 6.3, 6.4, 6.5, transformer 7 with secondary 7.1, 7.2 windings and rectifier 7.3 , phase control unit 8 transformers 8.1, 8.2, 8.3 and conclusions 8.1.1, 8.2.1, 8.3.1 For connecting one, another and third phases of a three-phase alternating current source, terminals 8.1.2, 8.2.2, 8.3.2 for connecting a three-phase load, rectifier 8.4 and terminals 8.4.1, 8.4.2 for connecting a relay, electric drive 9 with control 9.1 and working 9.2 contacts of the auto switch and three-phase electric motor 9.3, line wires 10, 11, 12, diodes 13, 14, 15, capacitors 16, 17, 18, 19, 20, resistors 21, 22, 23, 24, 25, 26 , 27, the power supply of the relay "+ PB", "-MB", a source of three-phase alternating current 28, an alternating current source 29.

The device of Fig.1 is shown in the normal state of control of the positive position of the arrow, while from the winding 7.1 of the transformer 7 through the resistor 25 to the windings 5.1, 6.1 and through the disconnecting contacts 4.4, 4.5, 4.6 to the linear wires 10, 11, 12 and connected to them through normally closed control 9.1 and normally closed working 9.2 contacts of the auto switch, diode 15 receives AC voltage from the source of this current 29, which is rectified by the action of diode 15, and the polarity of the rectified voltage coincides with the voltage polarity, fed through a normally closed contact 3.4 from the rectifier 7.3 to the windings 5.2, 6.2, which is why relays 5 and 6 are excited.

From terminal 1.1 of the UVK via a normally closed contact 3.1 of the polarized start relay and closed contacts 5.3, 6.3 of the arrow monitoring relay, a terminal contact test is sent to terminal 1.3 of the UVK, which fixes the positive position of the arrow.

To transfer the arrow from the positive to the negative position from the output device of the UVK, the relay switches the arrow to the negative position 2.2, which closes the contacts: 2.2.1, 2.2.2 and opens 2.2.3, from which the relay 4 is energized by the “+” rectifier 7.3 , normally closed contact 3.4, closed contacts 2.1.2, 2.2.2, relay coil 4.1, “-” rectifier 7.3. Relay 4 with make-up contacts 4.4 through a linear wire 10 and a normally closed working contact 9.2 will connect one output of the electric motor 9.3, with make-up contacts 4.6 through a linear wire 12 and a normally closed working contact 9.2 will connect another output of an electric motor 9.3, and with make-up contacts 4.5 through a linear wire 11 and a capacitor 20 will connect the third output of the electric motor 9.3 to an alternating current source 28 with an unchanged sequence of phase rotation, which means that the switch will not occur.

The opening of the normally open contact 4.6 will stop the power supply to the winding 5.1 from the diode 15, from which the relay 5 will release its armature and by the open making contact 5.3 it will stop feeding to the terminal 1.3 the test of the making contact, and by the closed making contact 5.3 it will send the test of the making contact from the terminal 1.2 to this terminal, which is why the control of the positive position of the arrow stops. The closed NC contact 5.4 will connect the NC test from terminal 1.2 to terminal 1.4, which will exclude the possibility of obtaining false control of the negative position of the arrow during this period of operation of the circuit.

Closed make contact 4.3 will create a relay 3 response circuit: “+ ПБ”, closed contact 2.2.1, relay winding 3, diode 13, closed contact 4.3, “-MB”.

Relay 3 with the switched contact 3.4 will connect through the resistor 22 the reverse polarity power of the windings 5.2, 6.2 from the rectifier 7.3.

The switched contacts 3.2, 3.3 will change the sequence of phase rotation from the source of the three-phase alternating current 28 in the linear wires 10, 12, which is why the three-phase electric motor 9.3 will begin to move the arrow to the negative position.

At the beginning of the translation of the arrow, the normally open working contacts 9.2 of the auto switch are closed, the control contacts 9.1 are opened and the diode 15 is disconnected from the line wires 10, 11, 12, which causes the DC 6.1 winding to cease, and relay 6 will also release its armature, open the 6.3 contacts , 6.4 and closes the making contact 6.5 and thereby creates a circuit for holding the armature of relay 4 with winding 4.2 from the rectifier 8.4 under the influence of the working current of the electric motor 9.3 flowing through the primary windings of transformers 8.1, 8.2, 8.3, which is why hold relay 4 anchors in the drawn position during the whole time the arrow is moved.

After the arrow is switched to the negative position, normally closed working contacts 9.2 of the auto switch will open, but the current path will be saved through the closed normally open working contacts 9.2 of the auto switch, and the normally open control contacts of the auto switch 9.1 will be closed, which will change the polarity of the connection of diode 15 to the linear wires 10, 11, 12.

Because the polarity of the connection of the diode 15 to the linear wires 10, 12 corresponds to the polarity of the power supply to the winding 6.2, then the relay 6 is excited under the influence of the voltage of the source 28 rectified by the diode 15 through the resistors 23, 24 and by the make contact 6.5, it will turn off the power supply circuit of the relay coil 4.2 why this relay will release its anchor and open the closing contacts 4.4, 4.5, 4.6 to disconnect the power of the electric motor 9.3 from the source 28, and the closed opening contacts 4.4, 4.5 will shunt the resistors 23, 24 and provide power to winding 5.1, 6.1 and diode 15 from the winding 7.1 of the transformer 7 through the resistor 25.

Relay 5 is energized because will receive power from the rectifier 15 through a closed opening contact 4.6, the polarity of which coincides with the polarity of the power received by the winding 5.2 from the rectifier 7.3.

Relay 6, which was previously excited under the influence of voltage source 28, after releasing the armature, relay 4 will continue to hold its armature in the pulled position under the influence of rectifier 15 connected to winding 6.1 and the voltage from winding 7.1, as well as under the influence of rectifier 7.3 connected to winding 6.2, due to the coincidence of the polarity of these voltages on the windings 6.1 and 6.2. After the relay 5 is activated, terminal 1.4 will receive a test of the make contact from terminal 1.1 through the switched contact 3.1 and closed make contacts 5.4, 6.4, which fixes the negative position of the arrow.

The arrow returns to the positive position in the same way when the relay switches the arrow to the positive position 2.1.

The operation of the proposed device when controlling a paired arrow occurs similarly to that described for a single arrow, taking into account the inclusion of paired arrows and connecting them to linear wires similar to that adopted in the prototype (see 1).

When the arrow is cut, both normally closed and normally open working contacts of the auto switch 9.2 will open and disconnect one and the other terminals of the electric motor 9.3 from the linear wires 10, 12, thereby eliminating the possibility of translating the cut arrow and thereby creating a safety hazard for the movement of trains. The exception of obtaining false control of the position of the arrow in this case, as in the opposed device, is achieved by opening all control contacts 9.1 of the auto switch.

In the proposed device, the number of relays and capacitors used is reduced, because it excludes the relay for controlling the positive position of the arrow and the relay for monitoring the negative position of the arrows, as well as the capacitors connected in the opposed device to the polarizing windings of the relay for monitoring the arrow to ensure that they operate through their opening contact. In addition, in the proposed device, two winding relay control arrows are used instead of three winding relays of the opposed device.

A variant of the proposed device, in which the working contacts of the auto switch 9.2 are connected not directly to the linear wires 10, 12, but directly to one and the other terminals of the electric motor 9.3.

Variants of the proposed device with power supply to the windings 5.2, 6.2 and 4.1 are possible not from a separate winding of the transformer 7 and rectifier 7.3, but from the power supply of the relay “+ ПБ”, “-МБ”, and it is also possible to connect windings 5.2, 6.2 in series instead of parallel in figure 1.

In the case of a voltage value of a source of three-phase alternating current 28 that is acceptable for the working winding of 6.1 relay 6, a variant of the device of Fig. 1 is possible without resistors 23, 24, but in this case one and the other conclusions of winding 6.1 are connected to the linear wires 10, 11 not through the disconnecting contacts 4.4, 4.5, and directly to the linear wires 10, 11.

A variant of the proposed device is possible, in which the wires connected to the terminals 1.3, 1.4, instead of connecting to the UVK, are connected respectively to one end of the windings of the positive (PC) and negative (MK) control switches of the arrows, the other ends of which are connected to one pole of the constant source current, and wire 1.1, instead of connecting to the UVK, is connected to the other pole of this power source. In this case, the contacts of the relay control the positive and negative positions of the arrows are used to enter information about the position of the arrows in the UVK in a known manner, adopted for this in the opposed device when it is part of a microprocessor centralization system.

The economic effect of the proposed three-wire control device arrow AC electric drive can be characterized by the following indicators:

- an increase in reliability due to the exclusion of the operation of the arrow monitoring relay through its opening contact;

- reducing the cost of the device by reducing the number of relays and capacitors used;

- a decrease in the cost of the device due to a decrease in the cost of the arrow monitoring relay due to a decrease in the number of windings in these relays from three to two;

- a decrease in power consumption by the polarizing windings of the switch control relay due to an increase in the electrical resistance of these windings due to a decrease in the number of these windings in the relay from three to two.

Literature:

1 Russian Patent RU 2396178 C1 IPC L 7/08 published on 08/10/2010.

Claims (1)

A switchgear control device containing three line wires, a three-phase electric motor drive and a circuit breaker with control and working contacts, a polarized start relay and a neutral start relay with a field winding and a hold winding, one and the other unipolar switch control relays with working windings and polarizing windings, phase control unit with terminals for connecting one, another and third phases of a three-phase alternating current, with one, other and third terminals for connected three-phase load and terminals for connecting a relay, control computer complex (UVK) of a microprocessor centralization system with test terminals for making and breaking contacts and terminals for entering information about the plus and minus positions of the arrow, relay relay switch box to the plus, minus position, transformers, diodes , capacitors, resistors, sources of direct, alternating and three-phase alternating currents, characterized in that the field winding of the neutral starting relay is connected at one end to to the opposite pole of the direct current source, and the other end to the other pole of this source, through a series-connected one normally closed contact of a polarized start relay, one normally open contact of the relay to switch the arrow to the plus position, one make contact to the relay to switch the arrows to the negative position, in parallel to which are connected in series one normally open contact of a polarized start relay, another make contact to put the arrow in the positive position, another open nth contact of the switch to switch the arrows to the negative position, while the parallel connected polarizing windings of one and the other control relay of the arrow are connected at one end to the other pole of the DC source through one normally closed contact of the polarized start relay and are connected to one pole of this DC source through one resistor and the other end, through one normally open contact of the polarized start relay, is connected to the other pole of the DC source and through the other resistor connected to one pole of this DC source, while the UVK NC contact test terminal is connected to the information terminal in the UVC of the negative position of the arrow through one NC contact of one arrow control relay, in parallel with which one NO contact of this relay is connected, connected through one connected in series the make contact of another control relay arrows and another normally open contact of the polarized start relay to the test terminal of the make contact of the UVK, while the test of the NC contact of the UVK is connected to the input terminal of information in the UVC about the positive position of the arrow through another NC of one monitoring relay, in parallel with which is connected another NO contact of this relay, connected through a series of other NO contacts of the other relay control arrows and another normally closed contact of the polarized trigger relay to the test terminal of the UVK make contact.