CN213986788U - Direct resistance monitoring device of electromagnet - Google Patents
Direct resistance monitoring device of electromagnet Download PDFInfo
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- CN213986788U CN213986788U CN202021899989.1U CN202021899989U CN213986788U CN 213986788 U CN213986788 U CN 213986788U CN 202021899989 U CN202021899989 U CN 202021899989U CN 213986788 U CN213986788 U CN 213986788U
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Abstract
The invention belongs to the technical field of electrical maintenance of nuclear power stations, and particularly relates to a direct resistance monitoring device and a monitoring method of an electromagnet, wherein the direct resistance monitoring device comprises the following steps: the system comprises a direct resistance monitoring device primary loop I, a direct resistance monitoring device secondary loop II, an electromagnet switch primary loop, an electromagnet switch secondary loop, an electromagnet switch remote control loop and a plurality of wires; the direct resistance monitoring device primary loop I is connected into the electromagnet switch primary loop through a lead, and the direct resistance monitoring device secondary loop II is connected into the electromagnet switch secondary loop through a lead; and the remote control loop of the electromagnet switch is connected into the secondary loop of the electromagnet switch through a switching-on and switching-off command relay contact.
Description
Technical Field
The utility model belongs to the technical field of the nuclear power station electrical maintenance, concretely relates to monitoring devices is hindered directly of electro-magnet.
Background
4 reactor main coolant pumps (hereinafter referred to as main pumps) are designed in a loop of each unit of a unit of No. 1 and No. 2 of a certain nuclear power station, a main pump bearing is lubricated by water, and each main pump is provided with an electromagnet. The electromagnet is used for reducing the axial force acting on the rotor by means of the acting force (in a downward direction) of the electromagnet when a main pump is started when the pressure of a primary circuit exceeds 7MPa or is cut off when the pressure of the primary circuit exceeds 13MPa, and the radial-thrust bearing lubricating water film is ensured to be established, so that the motor can overcome the friction torque on the rotor.
The original power supply mode of the main pump electromagnet is specially designed, a power supply is taken from an alternating current UPS, and the UPS supplies power to the electromagnet after being rectified by a rectifier. When the electromagnet is started, the rectifier is directly started, and the rectifier is started to operate with the electromagnet. The starting mode has high requirement on the shock resistance of the electronic elements, the electronic elements of the rectifier gradually weaken along with the accumulated shock resistance of the running time, the failure of the electronic elements is the cliff type development, and once the rectifier fails at the starting moment, the failure of the rectifier can cause that the electromagnet cannot be started, thus endangering the running safety of the main pump. In order to improve the running reliability of the main pump electromagnet, the electromagnet power supply is improved and optimized, a main pump electromagnet rectifier is omitted, and the electromagnet power supply is directly taken from a direct current bus through a direct current switch. The input or the exit of the main pump electromagnet is controlled by controlling the on and off of the direct current switch.
The availability of the electromagnet directly influences the operation safety of the main pump, the main pump is started and stopped under the condition of electromagnet failure, bearing bushes can be abraded and even burnt, and no state monitoring means exists in the original design during the hot standby period of the electromagnet. Therefore, in order to monitor the availability of the electromagnet in real time and avoid the situation that the operation safety of the main pump is possibly endangered when the main pump is started during the electromagnet fault, a direct resistance monitoring device of the electromagnet needs to be designed, the direct resistance value of the electromagnet can be measured during the electromagnet hot standby period and is sent to a main control picture for display, when the direct resistance value of the electromagnet is lower than the standard value of a manufacturer, a main control operator can manually adjust the start-stop sequence of the fault electromagnet corresponding to the main pump, the main pump is started and stopped when the pressure of a circuit meets the requirement that the electromagnet does not need to be started, and the.
SUMMERY OF THE UTILITY MODEL
The utility model aims at designing a monitoring devices is hindered directly of electro-magnet for there is not the monitoring means because of the electro-magnet hot standby period among the solution prior art, lead to opening under the electro-magnet trouble condition and stop the main pump and cause axle bush wearing and tearing or even burn out the technical problem of trouble.
The technical scheme of the utility model:
a direct resistance monitoring device for an electromagnet, comprising: the system comprises a direct resistance monitoring device primary loop I, a direct resistance monitoring device secondary loop II, an electromagnet switch primary loop, an electromagnet switch secondary loop, an electromagnet switch remote control loop and a plurality of wires;
the direct resistance monitoring device primary loop I is connected into the electromagnet switch primary loop through a lead, and the direct resistance monitoring device secondary loop II is connected into the electromagnet switch secondary loop through a lead; the electromagnet switch remote control loop is connected to the electromagnet switch secondary loop through a normally open contact K12-1 of a closing command relay K12 and a normally closed contact K11-1 of a tripping command relay K11.
The electromagnet switch primary loop comprises: the system comprises a positive power supply bus L +, a negative power supply bus L-, a primary plug X01, a main switch Q0, a main contact K1-1 of a main contactor K1, an electromagnet AS and a diode D1;
the positive power supply bus L + and the negative power supply bus L-are led to two upper ports of a main switch Q0 through a primary X01 insert, and a lower port of the main switch Q0 outputs a positive power supply L1+ and a negative power supply L1-; a positive power supply L1+ is connected into a main contact connecting terminal A of a main contactor K1, a main contact connecting terminal B of the main contactor K1 is in short circuit with a main contact connecting terminal D of the main contactor K1, and a main contact connecting terminal C of the main contactor K1 is connected into the positive electrode of an electromagnet AS;
the negative power supply L1-is connected with a main contact connecting terminal E of a main contactor K1, a main contact connecting terminal F of the main contactor K1 is connected with the negative electrode of the electromagnet AS, the positive electrode of the diode D1 is connected with the negative electrode of the electromagnet AS, and the negative electrode of the diode D1 is connected with the positive electrode of the electromagnet AS.
The electromagnet switch secondary circuit comprises: the control power switch Q1, a fault tripping contact Q0-1 of a main switch Q0, a normally open contact K12-1 of a closing command relay K12, a normally closed contact K11-1 of a tripping command relay K11, a main contactor K1 and a normally open contact K1-2 of a main contactor K1;
in the electromagnet switch secondary circuit: two upper ports of the control power switch Q1 are respectively connected with a positive power supply L1+ and a negative power supply L1-of the lower port of the main switch Q0 in the primary loop of the electromagnet switch through leads. The control power switch Q1 outputs a positive control power L2+ and a negative control power L2-. The positive control power supply L2+ is connected to one end of a fault tripping contact Q0-1 of a main switch Q0, the other end of the fault tripping contact Q0-1 of the main switch Q0 is connected to one end of a normally open contact K12-1 of a closing command relay K12, the other end of the normally open contact K12-1 of the closing command relay K12 is connected to one end of a normally closed contact K11-1 of a tripping command relay K11, the other end of the normally closed contact K11-1 of the tripping command relay K11 is connected to one end of a main contactor K1, the other end of the main contactor K1 is connected to a negative control power supply L2-, and the normally open contact K1-2 of the main contactor K1 is connected with the normally open contact K12-1 of the relay K12 in parallel.
The remote control loop of the electromagnet switch comprises a closing command relay K12, a tripping command relay K11 and a terminal block X10: 23. terminal row X10: 24 and terminal row X10: 25;
one end of the closing command relay K12 is connected to a terminal block X10: 25, the other end of the closing command relay K12 is connected to the terminal block X10: 23, one end of the trip command relay K11 is connected into the terminal block X10: 24, the other end of the trip command relay K11 is connected into terminal block X10: 23, the terminal row X10: 23. X10: 24 and X10: 25 is arranged on the switch cabinet where the electromagnet switch is arranged.
The direct resistance monitoring device primary loop I is connected to the positive and negative ends of an electromagnet AS in the electromagnet switch primary loop through a lead;
the direct resistance monitoring device primary loop I comprises: a main contactor K1 normally closed contact K1-4, a main contactor K1 normally closed contact K1-5, an intermediate relay K13 normally closed node K13-1, an intermediate relay K13 normally closed node K13-2, a direct resistance transmitter R401, a terminal row X10: 21. terminal row X10: 22 and a plurality of wires;
one input end of the resistor transmitter R401 is connected with one end of a normally closed contact K13-1 of an intermediate relay K13, the other end of the normally closed contact K13-1 of the intermediate relay K13 is connected with one end of a normally closed contact K1-4 of a main contactor K1, and the other end of the normally closed contact K1-4 of the main contactor K1 is connected with the anode of an electromagnet AS; the other input end of the resistor transmitter R401 is connected with one end of a normally closed node K13-2 of an intermediate relay K13, the other end of the normally closed node K13-2 of the intermediate relay K13 is connected with one end of a normally closed contact K1-5 of a main contactor K1, and the other end of the normally closed contact K1-5 of the main contactor K1 is connected with the negative electrode of an electromagnet AS;
resistance transmitter R401 outputs to terminal bank X10: 21 and X10: 22, the terminal row X10: 21 and X10: 22 are arranged on the switch cabinet where the electromagnet switch is arranged.
The direct resistance monitoring device secondary circuit II is connected to a lower port of a control power switch Q1 in the electromagnet switch secondary circuit through a lead;
the secondary circuit II of the direct resistance monitoring device comprises: the device comprises a positive electrode control power supply L2+, a negative electrode control power supply L2-, a direct-resistance transmitter auxiliary coil R401', an auxiliary power supply switch Q2, an intermediate relay K13, a main contactor K1 normally-open contact K1-3, a time relay T1, a time relay normally-open contact T1-1 and a plurality of leads;
the upper port of the auxiliary power switch Q2 is connected with an anode control power supply L2+, the lower port of the auxiliary power switch Q2 is connected with one end of a direct-resistance transmitter auxiliary coil R401 ', and the other end of the direct-resistance transmitter auxiliary coil R401' is connected with a cathode control power supply L2-;
one end of a normally open contact K1-3 of the main contactor K1 is connected with the positive control power supply L2+, the other end of the normally open contact K1-3 of the main contactor K1 is connected with one end of the time relay T1, and the other end of the time relay T1 is connected with the negative control power supply L2-;
one end of a normally open contact T1-1 of the time relay T1 is connected with a positive power supply L2+, the other end of the normally open contact T1-1 of the time relay T1 is connected with one end of an intermediate relay K13, and the other end of the intermediate relay K13 is connected with a negative control power supply L2-.
The utility model has the advantages that:
the utility model discloses a directly hinder monitoring devices of electro-magnet has following technological effect:
1) the availability of the electromagnet is monitored in real time by master control personnel conveniently, and the start-stop sequence of the main pump is optimized.
2) The running safety of the main pump can be guaranteed to the maximum extent, and the running reliability of the main pump is improved.
3) The monitoring device is simple in design and convenient to implement.
4) The monitoring device is automatically controlled to be switched on or switched off through a main contactor of the electromagnet switch and a time relay, and manual operation is not needed.
5) The used component of this monitoring devices is general component, and the transformation cost is low.
6) The electrification time of the element is shortened, the probability of element failure caused by long-term electrification of the element is reduced, and the running reliability of the device is improved.
Drawings
Fig. 1 is a circuit diagram of a primary loop of a direct resistance monitoring device of an electromagnet, which is connected to a primary loop of an electromagnet switch.
Fig. 2 is a circuit diagram of a secondary circuit of a direct resistance monitoring device of an electromagnet, which is connected to a secondary circuit of an electromagnet switch according to the present invention;
fig. 3 is a circuit diagram of the remote control loop of the electromagnet switch according to the present invention;
wherein: q0-main switch; q1-control power switch; q0-1-main switch fault trip contact; q2-auxiliary power switch;
k1-main contactor;
k1-1: main contactor K1 main contact;
k1-2: main contactor K1 normally open contact, K1-3: a main contactor K1 normally open contact;
k1-4: main contactor K1 normally closed contact, K1-5: a main contactor K1 normally closed contact;
k11: trip command relay, K11-1: trip command relay K11 normally closed contacts;
k12: closing command relay, K12-1: a normally open contact of a closing command relay K12;
k13: an intermediate relay; k13-1: normally closed contact of an intermediate relay K13;
k13-2: normally closed contact of an intermediate relay K13;
r401: a direct resistance transmitter; r401': a direct resistance transmitter auxiliary coil;
t1: a time relay; t1-1: a time relay T1 normally open contact;
l +: a positive power bus bar; l-: a negative power bus;
l1 +: a positive power supply; l1-: a negative power supply;
l2 +: a positive control power supply; l2-: a negative control power supply;
d1: a diode; AS: a main pump electromagnet coil; x01: primary insertion; x10: terminal strip
Detailed Description
The invention will be further described with reference to the following drawings and examples:
this patent is a direct resistance monitoring devices of electro-magnet, the device divide into primary loop I and secondary circuit II, inserts the primary loop and the secondary circuit of electro-magnet switch respectively, in the virtual frame in 1-2 as shown, utilizes the main contactor K1 and the time relay T1 control of electro-magnet switch to directly hinder monitoring devices' input or withdraw from.
The time relay T1 is controlled to be electrified or powered off through the main contactor K1 of the electromagnet switch, the contact capacity of T1 is small, and the number of contacts is small, so that the intermediate relay K13 is added, and the contact capacity and the number of contacts are increased by utilizing the intermediate relay K13.
Direct resistance monitoring devices of electro-magnet, include:
the system comprises a direct resistance monitoring device primary loop I, a direct resistance monitoring device secondary loop II, an electromagnet switch primary loop, an electromagnet switch secondary loop, a remote control loop and a plurality of wires;
the direct resistance monitoring device primary loop I is connected into the electromagnet switch primary loop through a lead, and the direct resistance monitoring device secondary loop II is connected into the electromagnet switch secondary loop through a lead; the electromagnet switch remote control loop is connected to the electromagnet switch secondary loop through a normally open contact K12-1 of a closing command relay K12 and a normally closed contact K11-1 of a tripping command relay K11.
The electromagnet switch primary loop comprises: the system comprises a positive power supply bus L +, a negative power supply bus L-, a primary plug X01, a main switch Q0, a main contact K1-1 of a main contactor K1, an electromagnet AS and a diode D1;
the positive power supply bus L + and the negative power supply bus L-are led to two upper ports of a main switch Q0 through a primary X01 insert, and a lower port of the main switch Q0 outputs a positive power supply L1+ and a negative power supply L1-; a positive power supply L1+ is connected into a main contact connecting terminal A of a main contactor K1, a main contact connecting terminal B of the main contactor K1 is in short circuit with a main contact connecting terminal D of the main contactor K1, and a main contact connecting terminal C of the main contactor K1 is connected into the positive electrode of an electromagnet AS;
the negative power supply L1-is connected with a main contact connecting terminal E of a main contactor K1, a main contact connecting terminal F of the main contactor K1 is connected with the negative electrode of the electromagnet AS, the positive electrode of the diode D1 is connected with the negative electrode of the electromagnet AS, and the negative electrode of the diode D1 is connected with the positive electrode of the electromagnet AS.
Still include in the electro-magnet switch secondary circuit: the control power switch Q1, a fault tripping contact Q0-1 of a main switch Q0, a normally open contact K12-1 of a closing command relay K12, a normally closed contact K11-1 of a tripping command relay K11, a main contactor K1 and a normally open contact K1-2 of a main contactor K1;
in the electromagnet switch secondary circuit: two upper ports of the control power switch Q1 are respectively connected with a positive power supply L1+ and a negative power supply L1-of the lower port of the main switch Q0 in the primary loop of the electromagnet switch through leads. The control power switch Q1 outputs a positive control power L2+ and a negative control power L2-. The positive control power supply L2+ is connected to one end of a fault tripping contact Q0-1 of a main switch Q0, the other end of the fault tripping contact Q0-1 of the main switch Q0 is connected to one end of a normally open contact K12-1 of a closing command relay K12, the other end of the normally open contact K12-1 of the closing command relay K12 is connected to one end of a normally closed contact K11-1 of a tripping command relay K11, the other end of the normally closed contact K11-1 of the tripping command relay K11 is connected to one end of a main contactor K1, the other end of the main contactor K1 is connected to a negative control power supply L2-, and the normally open contact K1-2 of the main contactor K1 is connected with the normally open contact K12-1 of the relay K12 in parallel.
The remote control loop of the electromagnet switch comprises a closing command relay K12, a tripping command relay K11 and a terminal block X10: 23. terminal row X10: 24 and terminal row X10: 25;
one end of the closing command relay K12 is connected to a terminal block X10: 25, the other end of the closing command relay K12 is connected to the terminal block X10: 23, one end of the trip command relay K11 is connected into the terminal block X10: 24, the other end of the trip command relay K11 is connected into terminal block X10: 23, the terminal row X10: 23. X10: 24 and X10: 25 is arranged on the switch cabinet where the electromagnet switch is arranged. The direct resistance monitoring device primary loop I is connected to the positive and negative ends of an electromagnet AS in the electromagnet switch primary loop through a lead;
the primary loop I of the direct resistance monitoring device comprises: a main contactor K1 normally closed contact K1-4, a main contactor K1 normally closed contact K1-5, an intermediate relay K13 normally closed node K13-1, an intermediate relay K13 normally closed node K13-2, a direct resistance transmitter R401, a terminal row X10: 21. terminal row X10: 22 and a plurality of wires;
one input end of the resistor transmitter R401 is connected with one end of a normally closed contact K13-1 of an intermediate relay K13, the other end of a normally closed contact K13-1 of an intermediate relay K13 is connected with one end of a normally closed contact K1-4 of a main contactor K1, and the other end of a normally closed contact K1-4 of a main contactor K1 is connected with the anode of an electromagnet AS; the other input end of the resistor transmitter R401 is connected with one end of a normally closed node K13-2 of an intermediate relay K13, the other end of the normally closed node K13-2 of the intermediate relay K13 is connected with one end of a normally closed contact K1-5 of a main contactor K1, and the other end of the normally closed contact K1-5 of the main contactor K1 is connected with the negative electrode of an electromagnet AS;
resistance transmitter R401 outputs to terminal bank X10: 21 and X10: 22, the terminal row X10: 21 and X10: 22 are arranged on the switch cabinet where the electromagnet switch is arranged. The direct resistance monitoring device secondary circuit II is connected to a lower port of a control power switch Q1 in the electromagnet switch secondary circuit through a lead;
the secondary circuit II of the direct resistance monitoring device comprises: the device comprises a positive electrode control power supply L2+, a negative electrode control power supply L2-, a direct-resistance transmitter auxiliary coil R401', an auxiliary power supply switch Q2, an intermediate relay K13, a main contactor K1 normally-open contact K1-3, a time relay T1, a time relay normally-open contact T1-1 and a plurality of leads;
the upper port of the auxiliary power switch Q2 is connected with an anode control power supply L2+, the lower port of the auxiliary power switch Q2 is connected with one end of a direct-resistance transmitter auxiliary coil R401 ', and the other end of the direct-resistance transmitter auxiliary coil R401' is connected with a cathode control power supply L2-;
one end of a normally open contact K1-3 of the main contactor K1 is connected with the positive control power supply L2+, the other end of the normally open contact K1-3 of the main contactor K1 is connected with one end of the time relay T1, and the other end of the time relay T1 is connected with the negative control power supply L2-;
one end of a normally open contact T1-1 of the time relay T1 is connected with a positive power supply L2+, the other end of the normally open contact T1-1 of the time relay T1 is connected with one end of an intermediate relay K13, and the other end of the intermediate relay K13 is connected with a negative control power supply L2-. Due to the physical characteristics of the inductor, reverse electric potential can be formed at two ends of the electromagnet AS at the moment of power failure of the electromagnet AS. In order to switch in the direct-resistance transmitter after the electromagnet discharges through the diode D1, the power-off time of the intermediate relay K13 is controlled by the time delay (time delay opening) of the time relay T1, and the time of switching in the electromagnet loop of the data acquisition loop of the direct-resistance transmitter is controlled.
Due to the inherent contact action time of the time relay T1 and the intermediate relay K13, the moment that the normally open contact of the main contactor K1 and the normally closed contact of the intermediate relay K13 are simultaneously switched on can exist, and the direct-resistance transmitter R401 data acquisition loop enters the direct-current high voltage and can burn the transmitter. In order to prevent direct-current voltage from entering a direct-resistance value data acquisition loop of the resistance transmitter R401, two closed contacts of the main contactor K1 are connected into the transmitter data acquisition loop, and therefore effective isolation of the direct-resistance value data acquisition loop of the direct-resistance transmitter and a direct-current high-voltage loop is achieved.
Because the electromagnet is in an uncharged state for a long time during the normal operation of the unit, in order to ensure the reliability of the electromagnet direct resistance monitoring device, the time relay T1 and the intermediate relay K13 in the device are charged only during the operation of the electromagnet except for the resistance transmitter R401, and the rest of the time is in a non-charged state. The time relay and the intermediate relay are electrified, the probability of electric element failure caused by long-term electrification can be reduced, and the running reliability of the device is improved.
Through the design, the direct resistance value of the electromagnet is measured in real time by using the direct resistance transmitter during the hot standby period of the electromagnet, and a master control picture is sent for display. The availability of the electromagnet is monitored by master control operation personnel conveniently, when the direct resistance value of the electromagnet is lower than the standard value of a manufacturer, the master control operation personnel can manually adjust the start-stop sequence of the fault electromagnet corresponding to the main pump, and the main pump is started and stopped when the pressure of a primary circuit meets the requirement of not starting the electromagnet, so that the operation safety of the main pump is guaranteed to the maximum extent, and the operation reliability of the main pump is improved.
The monitoring method of the direct resistance monitoring device of the electromagnet comprises the following steps:
the method comprises the following steps: the primary circuit I and the secondary circuit II of the direct resistance monitoring device are respectively connected into the primary circuit and the secondary circuit of the electromagnet switch, and the direct resistance value of the main pump electromagnet is monitored:
1.1 the auxiliary coil R401' of the direct resistance transmitter is connected to an auxiliary power supply through a switch Q2.
1.2 the normally open contact of the main contactor K1 is connected with a coil loop of a time relay T1 to control whether the time relay T1 is electrified or not.
The normally open contact (time delay opening) of the 1.3 time relay T1 is connected with a coil loop of the intermediate relay K13 to control whether the K13 is electrified or not.
1.4 the direct-resistance transmitter R401 is connected to the positive end and the negative end of the electromagnet AS through two pairs of normally closed contacts of the intermediate relay K13 and two pairs of normally closed contacts of the electromagnet switch main contactor K1, and the direct-resistance transmitter R401 is controlled to be put into or quit operation.
Step two: after the main contactor K1 is electrified and closed, the main contact of the main contactor K1 is closed, the electromagnet operates, meanwhile, the normally open contact of the main contactor is instantaneously closed, the time relay T1 is started, the normally open contact (delayed opening) of the time relay T1 is instantaneously closed, the intermediate relay K13 is instantaneously electrified, and the normally closed contact is opened; the normally closed contact of the intermediate relay and the normally closed contact of the main contactor instantly disconnect the direct-resistance transmitter R401 from the loop of the electromagnet AS, and the direct-resistance transmitter R401 quits operation;
step three: after the main contactor K1 is disconnected, the main contact of the main contactor K1 is disconnected, and the electromagnet stops running; simultaneously: the normally open contact of the main contactor K1 is instantaneously disconnected, and the time relay T1 is powered off; the normally closed contact of the main contactor K1 is closed instantaneously;
step four: the normally open contact of the time relay T1 is opened in a delayed manner for more than or equal to 20s, during the delayed opening period, the intermediate relay K13 is electrified continuously, the normally closed contacts K13-1 and K13-2 of the intermediate relay K13 are always in an off state, during the time period, an electromagnet AS coil and a diode D1 connected in parallel form a conduction loop, reverse potential in the AS coil is released in the diode connected in parallel with the AS coil, after the set delay is reached, the reverse potential in the coil is completely released, the normally open contact T1-1 of the time relay T1 is opened, the intermediate relay K13 is powered off, and the normally closed contact of the intermediate relay is closed;
step five: after two pairs of normally closed contacts of the electromagnet main contactor K1 and two pairs of normally closed contacts of the intermediate relay K13 are closed, the direct resistance transmitter R401 is connected to an electromagnet coil loop;
step six: the direct resistance transmitter R401 monitors the direct resistance value of the main pump electromagnet, converts the direct resistance value of the electromagnet into a 4-20mA signal and sends the signal to the master control monitoring system.
The specific operation of the examples is described as follows:
the electromagnet switch is connected to a positive power supply bus L + and a negative power supply bus L-through a primary plug X01, and supplies power to a primary loop of the electromagnet switch, a secondary loop of the electromagnet switch and a secondary loop of the direct resistance monitoring device through a main switch Q0.
After a master control sends a closing command, a closing command relay K12 is electrified instantly, a normally open contact K12-1 of a closing command relay K12 is closed, an electromagnet switch main contactor K1 is electrified to attract, a main contact K1 main contact K1-1 is closed, an electromagnet AS is electrified to operate, a normally open contact K1-2 of a main contactor K1 is closed, a closing command relay K12 is electrified, and a main contactor K1 keeps an electrified state.
After the master control sends a tripping command, the tripping command relay K11 is electrified instantly, the normally closed contact K11-1 of the tripping command relay K11 is opened, the main contactor K1 loses electricity, the main contact K1-1 of the main contactor K1 is disconnected, the normally open contact K1-2 of the main contactor K1 is opened, and the electromagnet AS is powered off.
When the main contactor K1 is electrified and attracted, the normally closed contacts K1-4 and K1-5 of the main contactor K1 are opened, the resistance transmitter R401 is isolated from the primary loop of the electromagnet switch, and the direct resistance monitoring device quits operation. Meanwhile, a normally open contact K1-3 of the main contactor K1 is closed, the time relay T1 operates in an electrified mode, a normally open contact (delayed opening) of the time relay T1 is closed instantaneously, the intermediate relay K13 is closed in an electrified mode, and normally closed contacts K13-1 and K13-2 of the intermediate relay K13 are opened. After the main contactor K1 is powered off, normally closed contacts K1-4 and K1-5 of the main contactor K1 are closed, a normally open contact K1-3 of the main contactor K1 is opened, the time relay T1 is powered off, and a normally open contact T1-1 of the time relay T1 is opened in a delayed mode, wherein the time delay is not less than 20 s. During the time delay opening period of the normally open contact T1-1 of the time relay T1, the intermediate relay K13 is electrified continuously, and the normally closed contacts K13-1 and K13-2 of the intermediate relay K13 are in an open state all the time. During the period, the electromagnet coil AS and the parallel diode D1 form a conducting loop, the reverse potential in the AS coil is discharged through the parallel diode D1, after the set time delay is reached, the reverse potential in the coil is completely released, the normally open contact T1-1 of the time relay T1 is opened, the intermediate relay K13 is powered off, and the normally closed contacts K13-1 and K13-2 of the intermediate relay K13 are closed;
after two pairs of normally closed contacts of the electromagnet main contactor K1 and two pairs of normally closed contacts of the intermediate relay K13 are closed, the direct resistance transmitter R401 is connected to an electromagnet coil loop;
the direct resistance transmitter R401 monitors the direct resistance value of the main pump electromagnet, converts the direct resistance value of the electromagnet into a 4-20mA signal and sends the signal to the master control monitoring system.
The present invention has been described in detail with reference to the accompanying drawings and examples, but the present invention is not limited to the above examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The present invention can adopt the prior art for the content which is not described in detail in the present invention.
Claims (6)
1. A direct resistance monitoring device of an electromagnet is characterized by comprising: the system comprises a direct resistance monitoring device primary loop I, a direct resistance monitoring device secondary loop II, an electromagnet switch primary loop, an electromagnet switch secondary loop, a remote control loop and a plurality of wires;
the direct resistance monitoring device primary loop I is connected into the electromagnet switch primary loop through a lead, and the direct resistance monitoring device secondary loop II is connected into the electromagnet switch secondary loop through a lead; the electromagnet switch remote control loop is connected to the electromagnet switch secondary loop through a normally open contact K12-1 of a closing command relay K12 and a normally closed contact K11-1 of a tripping command relay K11.
2. The direct resistance monitoring device of an electromagnet according to claim 1, wherein: the electromagnet switch primary loop comprises: the system comprises a positive power supply bus L +, a negative power supply bus L-, a primary plug X01, a main switch Q0, a main contact K1-1 of a main contactor K1, an electromagnet AS and a diode D1;
the positive power supply bus L + and the negative power supply bus L-are led to two upper ports of a main switch Q0 through a primary X01, and a lower port of the main switch Q0 outputs a positive power supply L1+ and a negative power supply L1-; a positive power supply L1+ is connected into a main contact connecting terminal A of a main contactor K1, a main contact connecting terminal B of the main contactor K1 is in short circuit with a main contact connecting terminal D of the main contactor K1, and a main contact connecting terminal C of the main contactor K1 is connected into the positive electrode of an electromagnet AS;
the negative power supply L1-is connected with a main contact connecting terminal E of a main contactor K1, a main contact connecting terminal F of the main contactor K1 is connected with the negative electrode of the electromagnet AS, the positive electrode of the diode D1 is connected with the negative electrode of the electromagnet AS, and the negative electrode of the diode D1 is connected with the positive electrode of the electromagnet AS.
3. The direct resistance monitoring device of an electromagnet according to claim 2, wherein: still include in the electro-magnet switch secondary circuit: the control power switch Q1, a fault tripping contact Q0-1 of a main switch Q0, a normally open contact K12-1 of a closing command relay K12, a normally closed contact K11-1 of a tripping command relay K11, a main contactor K1 and a normally open contact K1-2 of a main contactor K1; in the electromagnet switch secondary circuit: two upper ports of a control power switch Q1 are respectively connected with a positive power supply L1+ and a negative power supply L1-of a lower port of a main switch Q0 in a primary loop of the electromagnet switch through leads; the control power switch Q1 outputs a positive control power L2+ and a negative control power L2-; the positive control power supply L2+ is connected to one end of a fault tripping contact Q0-1 of a main switch Q0, the other end of the fault tripping contact Q0-1 of the main switch Q0 is connected to one end of a normally open contact K12-1 of a closing command relay K12, the other end of the normally open contact K12-1 of the closing command relay K12 is connected to one end of a normally closed contact K11-1 of a tripping command relay K11, the other end of the normally closed contact K11-1 of the tripping command relay K11 is connected to one end of a main contactor K1, the other end of the main contactor K1 is connected to a negative control power supply L2-, and the normally open contact K1-2 of the main contactor K1 is connected with the normally open contact K12-1 of the relay K12 in parallel.
4. A direct resistance monitoring device for an electromagnet according to claim 3, wherein: the remote control loop of the electromagnet switch comprises a closing command relay K12, a tripping command relay K11 and a terminal block X10: 23. terminal row X10: 24 and terminal row X10: 25;
one end of the closing command relay K12 is connected to a terminal block X10: 25, the other end of the closing command relay K12 is connected to the terminal block X10: 23, one end of the trip command relay K11 is connected into the terminal block X10: 24, the other end of the trip command relay K11 is connected into terminal block X10: 23, the terminal row X10: 23. x10: 24 and X10: 25 is arranged on the switch cabinet where the electromagnet switch is arranged.
5. A direct resistance monitoring device for an electromagnet according to claim 3, wherein: the direct resistance monitoring device primary loop I is connected to the positive and negative ends of an electromagnet AS in the electromagnet switch primary loop through a lead;
the direct resistance monitoring device primary loop I comprises: a main contactor K1 normally closed contact K1-4, a main contactor K1 normally closed contact K1-5, an intermediate relay K13 normally closed node K13-1, an intermediate relay K13 normally closed node K13-2, a direct resistance transmitter R401, a terminal row X10: 21. terminal row X10: 22 and a plurality of wires;
one input end of the direct-resistance transmitter R401 is connected with one end of a normally closed contact K13-1 of an intermediate relay K13, the other end of the normally closed contact K13-1 of the intermediate relay K13 is connected with one end of a normally closed contact K1-4 of a main contactor K1, and the other end of the normally closed contact K1-4 of the main contactor K1 is connected with the anode of an electromagnet AS; the other input end of the direct-resistance transmitter R401 is connected to one end of a normally closed node K13-2 of an intermediate relay K13, the other end of the normally closed node K13-2 of the intermediate relay K13 is connected to one end of a normally closed contact K1-5 of a main contactor K1, and the other end of the normally closed contact K1-5 of the main contactor K1 is connected to the negative electrode of an electromagnet AS;
the resistive transmitter R401 outputs to terminal block X10: 21 and X10: 22, the terminal row X10: 21 and X10: 22 are arranged on the switch cabinet where the electromagnet switch is arranged.
6. A direct resistance monitoring device for an electromagnet according to claim 3, wherein: the direct resistance monitoring device secondary circuit II is connected to a lower port of a control power switch Q1 in the electromagnet switch secondary circuit through a lead;
the secondary circuit II of the direct resistance monitoring device comprises: the device comprises a positive electrode control power supply L2+, a negative electrode control power supply L2-, a direct-resistance transmitter auxiliary coil R401', an auxiliary power supply switch Q2, an intermediate relay K13, a main contactor K1 normally-open contact K1-3, a time relay T1, a time relay normally-open contact T1-1 and a plurality of leads;
the upper port of the auxiliary power switch Q2 is connected with an anode control power supply L2+, the lower port of the auxiliary power switch Q2 is connected with one end of a direct-resistance transmitter auxiliary coil R401 ', and the other end of the direct-resistance transmitter auxiliary coil R401' is connected with a cathode control power supply L2-;
one end of a normally open contact K1-3 of the main contactor K1 is connected with the positive control power supply L2+, the other end of the normally open contact K1-3 of the main contactor K1 is connected with one end of the time relay T1, and the other end of the time relay T1 is connected with the negative control power supply L2-;
one end of a normally open contact T1-1 of the time relay T1 is connected with a positive power supply L2+, the other end of the normally open contact T1-1 of the time relay T1 is connected with one end of an intermediate relay K13, and the other end of the intermediate relay K13 is connected with a negative control power supply L2-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021899989.1U CN213986788U (en) | 2020-09-03 | 2020-09-03 | Direct resistance monitoring device of electromagnet |
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| CN202021899989.1U CN213986788U (en) | 2020-09-03 | 2020-09-03 | Direct resistance monitoring device of electromagnet |
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