CN217002053U - 630MW unit exchanges lubricating oil pump self-starting system - Google Patents
630MW unit exchanges lubricating oil pump self-starting system Download PDFInfo
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- CN217002053U CN217002053U CN202123253429.6U CN202123253429U CN217002053U CN 217002053 U CN217002053 U CN 217002053U CN 202123253429 U CN202123253429 U CN 202123253429U CN 217002053 U CN217002053 U CN 217002053U
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Abstract
The utility model discloses a self-starting system of a 630MW unit alternating-current lubricating oil pump, which mainly adopts the technical scheme that a loop power supply is controlled by a switch; a normally closed trip circuit, one end of which is connected with the switch control loop power supply; the voltage-loss restarting protection device comprises a voltage-loss restarting switch-on and switch-off contact and a protection device standby switch-on and switch-off contact, wherein one end of the voltage-loss restarting switch-on and switch-off contact is connected with the other end of the normally-closed trip circuit; the closing loop is connected with the voltage-loss restarting opening contact in parallel, and one end of the closing loop is connected with the other end of the normally closed tripping circuit; one end of the closing coil is respectively connected with the other end of the voltage-loss restarting opening contact and the other end of the closing loop, and the other end of the closing coil is connected with a power supply of the switch control loop; the contactor is used for auxiliary contact.
Description
Technical Field
The utility model relates to the technical field of switch control loops, in particular to a self-starting system of a 630MW unit alternating-current lubricating oil pump.
Background
A switch control loop of a 630MW AC lubricating oil pump in the prior art uses a contactor and a comprehensive relay for control. When the service voltage loss interlocking test is carried out, the service voltage loss occurs, the alternating-current lubricating oil pump switch is tripped in a power loss mode, the alternating-current lubricating oil pump switch cannot be restarted automatically after the service voltage is recovered when the diesel engine is started, manual starting is needed, manpower and time are consumed, and the emergency effect on the main equipment of the generator cannot be effectively achieved. Under emergency conditions such as loss of voltage of the service power and the like, the starting and starting speed of the alternating-current lubricating oil pump directly influence the safe and stable operation of the main equipment of the generator and even the unit.
Disclosure of Invention
In view of this, the utility model provides a self-starting system for a 630MW unit ac lubricating oil pump, and mainly aims to provide a self-starting system for a 630MW unit ac lubricating oil pump, which can be quickly and automatically restarted after the service power is depressurized and the voltage is restored, and effectively plays an emergency role in the main equipment of a generator.
In order to achieve the purpose, the utility model mainly provides the following technical scheme:
the embodiment of the utility model provides a self-starting system of a 630MW unit alternating-current lubricating oil pump.
It includes:
a switch control loop power supply;
a normally closed trip circuit, one end of which is connected with the switch control loop power supply;
the voltage-loss restarting protection device comprises a voltage-loss restarting switch-on and switch-off contact and a protection device standby switch-on and switch-off contact, wherein one end of the voltage-loss restarting switch-on and switch-off contact is connected with the other end of the normally closed trip circuit;
the closing loop is connected with the voltage-loss restarting opening contact in parallel, and one end of the closing loop is connected with the other end of the normally closed tripping circuit;
one end of the closing coil is connected with the other end of the voltage-loss restarting opening contact and the other end of the closing loop respectively, and the other end of the closing coil is connected with the switch control loop power supply;
the contactor auxiliary contact, the one end of contactor auxiliary contact with the on-off control circuit power is connected, the other end of contactor auxiliary contact with the reserve one end of opening the access point of protection device is connected, the reserve other end of opening the access point of protection device with the on-off control circuit power is connected.
As mentioned above, the no-voltage restart protection device adopts an LPC-3531 protector.
By the technical scheme, the utility model (name) at least has the following advantages:
the 630MW unit alternating-current lubricating oil pump self-starting system of the utility model changes a brake-separating instruction into a normally closed trip circuit by optimizing a switch control loop, cancels a comprehensive relay, utilizes the characteristic of quick start of a diesel generator, adds a no-voltage restart protection device which has a no-voltage restart function and avoids the no-voltage time exceeding the start time of the diesel generator motor, connects a no-voltage restart switch contact in parallel on a switch-on loop, when the station power is lost, the alternating-current lubricating oil pump trips, the diesel generator is started, after the voltage is built for about 11 seconds, the power supply of the switch control loop recovers (30 seconds lower than a set value), the no-voltage restart protection device protects the action, the no-voltage restart switch contact action is merged into the switch-on loop, the switch-on coil is electrified, the alternating-current lubricating oil pump switches on, the alternating-current lubricating oil pump is started successfully, and under the condition of the station power loss, the time from the switching on of the alternating-current lubricating oil pump to switching on the switch is totally 12 seconds, the AC lubricating oil pump is started automatically in time, so that further expansion of fault equipment can be avoided, and damage to main equipment of the generator is prevented.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a self-starting system of a 630MW unit AC lubricating oil pump of the utility model;
fig. 2 is a flow chart of the operation of the self-starting system of the 630MW unit ac lubricating oil pump of the utility model.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1, an embodiment of the present invention provides a self-starting system for a 630MW unit ac lubricating oil pump, which includes: the circuit comprises a switch control loop power supply 1, a normally closed trip circuit 2, a no-voltage restart protection device 3, a closing loop 4, a closing coil 5 and a contactor auxiliary contact 6.
One end of the normally closed tripping circuit 2 is electrically connected with the switch control loop power supply 1; the no-voltage restart protection device 3 comprises a no-voltage restart switch-on contact 31 and a protection device standby switch-on contact 32, wherein one end of the no-voltage restart switch-on contact 31 is connected with the other end of the normally closed trip circuit 2; when the overvoltage restart protection device is used specifically, the overvoltage restart protection device may adopt an LPC-3531 protector, and may also adopt protectors of other types, which is not limited in the specific embodiment of the present invention. The closing loop 4 is connected with the voltage-loss restarting opening contact 31 in parallel, and one end of the closing loop 4 is connected with the other end of the normally closed tripping circuit 2; the protection device comprises a switching-on coil 5, one end of the switching-on coil 5 is respectively connected with the other end of a voltage-loss restart switch-off contact 31 and the other end of a switching-on loop 4, the other end of the switching-on coil 5 is connected with a switching control loop power supply 1, a contactor auxiliary contact 6 is arranged, one end of the contactor auxiliary contact 6 is connected with the switching control loop power supply 1, the other end of the contactor auxiliary contact 6 is connected with one end of a protection device standby switch-on contact 32, and the other end of the protection device standby switch-on contact 32 is connected with the switching control loop power supply 1. The utility model provides a contactor state for the voltage-loss restarting protection device 3 by connecting the auxiliary contact 6 of the contactor into the backup opening contact 32 of the protection device, so that the voltage-loss restarting protection device 3 can judge whether the switch of the alternating-current lubricating oil pump operates or not.
The specific working process of the embodiment of the utility model is as follows:
s1, a 630MW unit voltage short-time fault, station service voltage loss, tripping of an alternating-current lubricating oil pump switch and detection of switch deflection by a voltage loss restarting protection device;
s2, when one of the following conditions is met, the voltage-loss restarting protection device records the voltage-loss time t 1:
condition 1: when the voltage is lower than the set value once normal, the motor has current or does not flow, and the voltage-loss restart outlet contact of the voltage-loss restart protection device is at the normal position.
Condition 2: and when the voltage is lost, the protection device is restarted to perform undervoltage protection action, and the motor has current or no current. And leading out the voltage-loss restarting protection device, and leading out a voltage-loss restarting switch-on contact to be connected into a switch closing loop.
S3, starting the diesel generator, and recovering the service voltage to be normal within about 11 seconds; recording voltage recovery time t 2: provided that time t1 has been recorded and the voltage is above the undervoltage protection setpoint;
s4, calculating the electricity shaking time delta t as t2-t 1;
and S5, judging whether the current interference time (delta t) is within the setting time (30 seconds). If yes, after the setting time (voltage recovery delay starting time), the voltage-losing restart switch-out contact is closed, and the alternating-current lubricating oil pump switch is switched on. If not, the operation is not carried out.
The 630MW unit alternating-current lubricating oil pump self-starting system provided by the embodiment of the utility model changes a brake opening instruction into a normally closed trip circuit by optimizing a switch control loop, cancels a comprehensive relay, utilizes the characteristic of quick start of a diesel generator, adds a no-voltage restart protection device which has a no-voltage restart function and avoids the no-voltage time exceeding the start time of a diesel engine motor, connects a no-voltage restart starting contact in parallel on a closing loop, when the station power is lost, the alternating-current lubricating oil pump trips, the diesel generator is started, after the pressure build-up is finished for about 11 seconds, a switch control loop power supply is recovered (30 seconds lower than a set value), the no-voltage restart protection device performs protection action, the no-voltage restart starting contact action is merged into the closing loop, a closing coil is electrified, an alternating-current lubricating oil pump is switched on, the alternating-current lubricating oil pump is started successfully, under the condition of the station power loss, the total time from tripping of the switch of the alternating-current lubricating oil pump to reclosing is 12 seconds, the alternating-current lubricating oil pump is started automatically in time, the fault equipment can be prevented from being further enlarged, and the damage to the main equipment of the generator is prevented.
While the utility model has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (2)
1. The utility model provides a 630MW unit alternating-current lubricating oil pump self-starting system which characterized in that: it includes:
a switch control loop power supply;
a normally closed trip circuit, one end of which is connected with the switch control loop power supply;
the voltage-loss restarting protection device comprises a voltage-loss restarting switch-on and switch-off contact and a protection device standby switch-on and switch-off contact, wherein one end of the voltage-loss restarting switch-on and switch-off contact is connected with the other end of the normally closed trip circuit;
the closing loop is connected with the voltage-loss restarting opening contact in parallel, and one end of the closing loop is connected with the other end of the normally closed tripping circuit;
one end of the closing coil is connected with the other end of the voltage-loss restarting opening contact and the other end of the closing loop respectively, and the other end of the closing coil is connected with the switch control loop power supply;
the contactor auxiliary contact, the one end of contactor auxiliary contact with the on-off control circuit power is connected, the other end of contactor auxiliary contact with the reserve one end of opening the access point of protection device is connected, the reserve other end of opening the access point of protection device with the on-off control circuit power is connected.
2. The 630MW unit AC lubrication oil pump self-starting system as claimed in claim 1,
the no-voltage restart protection device adopts an LPC-3531 protector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123253429.6U CN217002053U (en) | 2021-12-22 | 2021-12-22 | 630MW unit exchanges lubricating oil pump self-starting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123253429.6U CN217002053U (en) | 2021-12-22 | 2021-12-22 | 630MW unit exchanges lubricating oil pump self-starting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217002053U true CN217002053U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123253429.6U Active CN217002053U (en) | 2021-12-22 | 2021-12-22 | 630MW unit exchanges lubricating oil pump self-starting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217002053U (en) |
-
2021
- 2021-12-22 CN CN202123253429.6U patent/CN217002053U/en active Active
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