CN212463099U - Electrical control system of emergency safety equipment of generator set - Google Patents
Electrical control system of emergency safety equipment of generator set Download PDFInfo
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- CN212463099U CN212463099U CN202021444543.XU CN202021444543U CN212463099U CN 212463099 U CN212463099 U CN 212463099U CN 202021444543 U CN202021444543 U CN 202021444543U CN 212463099 U CN212463099 U CN 212463099U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses an electric control system of safety equipment for generating set accidents, which comprises a starting loop and a stopping loop; the starting loop comprises a remote control starting loop and a local starting loop which are connected in parallel; one end of the starting loop is connected with the control power supply, and the other end of the starting loop is connected with the switching-on/off module 1 SWJ; the stopping loop comprises a remote control stopping loop and a local stopping loop which are connected in parallel; one end of the stopping loop is connected with the control power supply, and the other end of the stopping loop is connected with the switching-on/off module 1 SWJ; the control loop is connected with a contactor starting loop and a time delay protection module; the contactor starting circuit comprises a switching-on and switching-off module contact and a contactor which are connected in series; and the time delay protection module comprises a power-off time delay relay ZJ and a power-on time delay relay SJ. By additionally arranging the power-on delay relay and the power-off delay relay, different self-starting delay times are set for different accident safety equipment, so that a plurality of pieces of equipment are started in batches in a time-sharing manner, the initial load starting current of the diesel generator can be reduced, and the condition that the diesel generator is excessively loaded instantaneously is avoided.
Description
Technical Field
The utility model relates to a generator accident security equipment field, concretely relates to generating set accident security equipment electrical control system.
Background
The power plant is for guaranteeing unit safe operation, is equipped with accident security section 400V power supply bus, and this section contains: equipment such as host computer lubricating-oil pump, apical axis oil pump, host computer hydrogen sealed oil pump, little quick-witted lubricating-oil pump, electronic feed-water pump lubricating-oil pump, fan lubricating-oil pump also can normal operating after losing external power source for the guarantee unit safety opens and stops needs accident security section equipment, therefore accident security section has been equipped with dual supply automatic switching control equipment, and operating power is supplied power by the station service power, and stand-by power supply is supplied power by diesel generator.
The electric control loop of the accident security section with the common design has the function of voltage loss self-starting so as to ensure that the equipment can continue to operate after the power supply is interrupted and recovered for a short time. However, the voltage loss self-starting function can cause that the pump equipment in the accident security section is completely started when the diesel generator is started after the service power failure, the instantaneous starting current is larger than the initial loading capacity of the diesel generator, so that the diesel generator cannot be normally started, the generator set cannot be safely stopped when the emergency power supply is lost, and the damage of the unit equipment causes huge economic loss.
In the actual production operation, the power generating set of the company is provided with one diesel engine set with the capacity of 1160 kW and the rated current of 2237A, an accident safety 400V bus section supplies power for important auxiliary equipment such as a main engine lubricating oil pump, a top shaft oil pump, a main engine hydrogen sealing oil pump, a small engine lubricating oil pump, an electric water feeding pump lubricating oil pump, a fan lubricating oil pump and the like, and the rated currents of the equipment are 420A in total. As shown in fig. 1, the operation of the electrical control circuit of the device is as follows:
(1) normally starting and stopping:
the 1ZK and the 1CK are sent to the on-site position, a closing button 1HA on an electric control cabinet door is pressed, a 1SWJ closing coil is excited, a 1SWJ normally open contact on a contactor starting loop is closed, a contactor 1C is excited to act, and the electric equipment is electrified to operate; a trip button 1TA on the electric control cabinet door is pressed, a 1SWJ trip coil is excited, a 1SWJ normally open contact on a contactor starting loop is disconnected, so that a contactor 1C is powered off, and equipment is powered off and stops rotating. When the 1CK is arranged at a remote control position, the DCS remote control switching-on and tripping operation program refers to the local state.
(2) Pressure loss self-starting:
after the equipment is switched on, a normally open contact of the double-position self-locking high-power relay 1SWJ is always kept in a closed state (the normally open contact is disconnected after a tripping command is received), if transient voltage is low and power is lost at the operating position of the equipment, the 1C contactor is electrified and excited after the voltage is recovered, and the normal operation of a motor is ensured.
The electrical control mode can realize the normal start and stop of the accident safety equipment, has the functions of remote/local operation and the function of voltage loss self-starting, is complete in theory, but exposes an important hidden danger in the application of the actual simulation accident state diesel engine starting test:
when the station power supply fails, all the pump devices in the emergency security section are all started, and the instantaneous starting current is larger than the initial loading capacity of the diesel generator. Diesel generator selection according to appendix D of design Specification for factory use of DLT 5153-2014 thermal power plant: the first loading capacity of the diesel generator is not lower than 50% of the rated power, and the actual output is required to be more than 2 times of the initial output. Consult diesel generator manufacturer's specifications, which record the first load capacity as 70% of rated power (812 kW); the allowable starting current is 1465A through calculation; and the actual starting current is 6 x 420A = 2020A; the starting current of the motor is 6-8 times of rated current, and is calculated according to 6 times), and the initial loading capacity of the diesel generator is far exceeded. For diesel generator can start smoothly under the guarantee accident situation, the utility model discloses carried out time delay protection to original design return circuit and reformed transform.
Disclosure of Invention
The utility model aims to solve the technical problem that a generating set accident security equipment electrical control system is provided, this return circuit reforms transform based on current return circuit, circular telegram time delay protection relay and outage time delay protection relay have been add on current return circuit, it all participates in the self-starting to have solved current return circuit at the whole pump machine equipment of the back accident safety segment of losing electricity, instantaneous starting current is greater than the initial area load capacity of diesel generator, lead to diesel generator can not normal boot easily, generating set loses the problem that emergency power source can not the safety shut down.
In order to realize the above design, the utility model adopts the following technical scheme: an electric control system of a safety device for generating set accidents comprises a starting loop and a stopping loop; the starting loop comprises a remote control starting loop and a local starting loop which are connected in parallel; one end of the starting loop is connected with the control power supply, and the other end of the starting loop is connected with the switching-on/off module 1 SWJ; the stopping loop comprises a remote control stopping loop and a local stopping loop which are connected in parallel; one end of the stopping loop is connected with the control power supply, and the other end of the stopping loop is connected with the switching-on/off module 1 SWJ; the control loop is also connected with a contactor starting loop and a delay protection module; the contactor starting circuit comprises a switching-on and switching-off module contact and a contactor which are connected in series; and the time delay protection module comprises a power-off time delay relay ZJ and a power-on time delay relay SJ.
And the contact of the opening and closing module is a normally open contact.
Furthermore, the switching module contact is controlled by the excitation of the closing coil and the opening coil of the switching module 1 SWJ.
The power-off delay relay ZJ is electrically connected on a starting circuit of the contactor; and the power-off delay relay ZJ is connected with the contactor in parallel.
And one end of the electrifying delay relay SJ is connected with the positive electricity of the control power supply, and the other end of the electrifying delay relay SJ is connected with the negative electricity of the control power supply.
Further, the energization delay relay SJ is energized and de-energized by the air automatic switch 1 ZK.
And a contact of the electrifying delay relay SJ and a contact of the opening and closing module are connected in series to a starting loop of the contactor and used as an electrifying delay protection contact.
And the contact of the power-off delay relay ZJ and the power-on delay protection contact are connected in parallel to a starting loop of the contactor and used as a power-off maintaining protection contact.
Furthermore, the power-on delay protection contact and the power-off maintaining protection contact are normally open contacts.
Furthermore, the delay time of the electrified delay relay is set according to the specific requirements of the accident security equipment; the emergency safety equipment is divided into different batches to be started in a time-sharing mode, and the electrified delay relays with different time lengths are adopted for the emergency safety equipment of different batches.
The electric control system of the generator set accident safety equipment has the following beneficial effects:
1, a self-starting time-delay relay SJ and a self-starting power-off holding relay ZJ are added in an improved control loop, so that instant self-starting after short-time power-off 0.5S internal recovery and delayed self-starting after long-time power-off recovery are realized; different self-starting delay times are set for different accident security equipment, so that a plurality of equipment are started in batches in a time-sharing manner, the initial on-load starting current of the diesel generator can be reduced, the phenomenon that the instantaneous on-load of the diesel generator is overlarge is avoided, and the diesel generator is guaranteed to be started smoothly.
2, the improved scheme of the utility model is based on the existing loop, and by additionally arranging a self-starting time-delay relay SJ and a self-starting power-off maintaining relay ZJ, the relay is connected to the contactor starting loop of the original equipment, so that the on-load control of the diesel generator during the long-time power-off recovery can be realized, and the problem that the instantaneous starting current is greater than the initial on-load capacity of the diesel generator is solved; the control circuit of the existing emergency safety equipment of the unit is convenient to reform, and is convenient to popularize and implement in an electric power production enterprise.
Drawings
Fig. 1 is a schematic diagram of a circuit structure in the prior art before the improvement of the present invention.
Fig. 2 is a schematic diagram of the improved circuit structure of the present invention.
The reference numbers in the figures are: the contactor starting circuit 1, the opening and closing module contact 11, the contactor 12, the power-on delay protection contact 21 and the power-off maintaining protection contact 22.
Detailed Description
As shown in fig. 1-2, an electrical control system for a generator set emergency safety device includes a start circuit and a stop circuit; the starting loop comprises a remote control starting loop and a local starting loop which are connected in parallel; one end of the starting loop is connected with the control power supply, and the other end of the starting loop is connected with the switching-on/off module 1 SWJ; the stopping loop comprises a remote control stopping loop and a local stopping loop which are connected in parallel; one end of the stopping loop is connected with the control power supply, and the other end of the stopping loop is connected with the switching-on/off module 1 SWJ; the control loop is also connected with a contactor starting loop 1 and a delay protection module; the contactor starting circuit 1 comprises a switching-on/off module contact 11 and a contactor 12 which are connected in series; and the time delay protection module comprises a power-off time delay relay ZJ and a power-on time delay relay SJ.
In a preferred scheme, the switching module contact 11 is a normally open contact.
In a preferred embodiment, the switching module contact 11 is controlled by the switching coil and the switching coil of the switching module 1 SWJ.
In the preferred scheme, a power-off delay relay ZJ is electrically connected to a contactor starting loop 1; the power-off delay relay ZJ is connected in parallel with the contactor 12.
In the preferred scheme, one end of an electrifying delay relay SJ is connected with the positive electricity of a control power supply, and the other end of the electrifying delay relay SJ is connected with the negative electricity of the control power supply.
In the preferred scheme, the power-on delay relay SJ is controlled by an air automatic switch 1ZK to be powered on and powered off.
In the preferred scheme, the energization delay relay SJ is a self-starting delay relay with the model of ohm dragon H3Y-2-C and the delay interval of 0-60 s; the delay setting is divided into 3S, 13S, 23S, 33S and other batches according to the importance of the equipment, and 13S is selected in the embodiment.
In the preferred scheme, the power-off delay relay ZJ is a self-starting delay relay with the model of ohm dragon H3CR-H8L and the delay interval of 0S-0.6S, and the power-off delay is kept for 0.5S.
In a preferred scheme, a contact of the energization delay relay SJ and a contact 11 of the switching-on/switching-off module are connected in series to the contactor starting circuit 1 to serve as an energization delay protection contact 21.
In a preferred scheme, a contact of the power-off delay relay ZJ and a power-on delay protection contact 21 are connected to the contactor starting circuit 1 in parallel to serve as a power-off maintaining protection contact 22.
In a preferred embodiment, the energization delay protection contact 21 and the power-off maintenance protection contact 22 are both normally open contacts.
In the preferred scheme, the delay time of the electrified delay relay is set according to the specific requirements of the accident security equipment; the emergency safety equipment is divided into different batches to be started in a time-sharing mode, and the electrified delay relays with different delay time lengths are adopted for the emergency safety equipment of different batches.
The working principle of the utility model is as follows:
1, normally starting and stopping:
feeding the power-on time delay relay SJ into the 1ZK, delaying the power-on time delay relay SJ for 13 seconds, then operating, conducting a power-on time delay protection contact 21, switching on the spot or remotely, conducting a switching-on/off module contact 11, conducting a contactor starting loop 1, and operating a contactor 12; and (4) local or remote control brake opening, the contact 11 of the opening and closing module is disconnected, and the contactor 12 returns.
2, the power is lost for a short time (within 0.5S), the equipment is started automatically and keeps running:
after the equipment is switched on, the switching-on and switching-off module contact 11 is kept on, the power-off delay relay ZJ acts, and the power-off protection contact 22 is kept closed; if the power supply loses power within 0.5S, the connection point of the electrifying delay relay SJ acts and is disconnected instantly, the power-off keeping protection connection point 22 cannot be disconnected within 0.5S, after the power supply in 0.5S is recovered, the contactor 12 conducts the electrified action through the connection point 11 of the opening and closing module and the power-off keeping protection connection point 22, and the equipment avoids low-voltage ride-through and recovers normal operation.
And 3, the power supply loses power for a long time (more than 0.5S), and the equipment is started to operate after 13S time delay:
after the equipment is switched on, the switching-on and switching-off module contact 11 is kept on, the power-off delay relay ZJ acts, and the power-off protection contact 22 is kept closed; if the power loss of the power supply exceeds 0.5S, the power-on delay protection contact 21 is instantaneously turned off, the power-off maintaining protection contact 22 is turned off after delaying for 0.5S, and the power loss equipment of the contactor 12 is stopped; when the power supply of the equipment is recovered after 0.5S, the power-on delay relay SJ coil is powered on, the power-on delay protection contact 21 acts and is closed after the 13S delay, the contactor 12 conducts the electrified action through the opening and closing module contact 11 and the power-on delay protection contact 21, the equipment is started and operated, the equipment is started after the 13S delay, the initial load current of the diesel generator is reduced, and the diesel generator is ensured to be started smoothly.
The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the technical solutions described in the claims, including the technical features of the equivalent alternatives as the protection scope. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (7)
1. An electric control system of a safety device for generating set accidents comprises a starting loop and a stopping loop; the starting loop comprises a remote control starting loop and a local starting loop which are connected in parallel; one end of the starting loop is connected with the control power supply, and the other end of the starting loop is connected with the switching-on/off module 1 SWJ; the stopping loop comprises a remote control stopping loop and a local stopping loop which are connected in parallel; one end of the stopping loop is connected with the control power supply, and the other end of the stopping loop is connected with the switching-on/off module 1 SWJ; the method is characterized in that: the control loop is also connected with a contactor starting loop (1) and a time delay protection module; the contactor starting circuit (1) comprises a switching-on/off module contact (11) and a contactor (12) which are connected in series; and the time delay protection module comprises a power-off time delay relay ZJ and a power-on time delay relay SJ.
2. A power generation unit accident safety equipment electrical control system according to claim 1, wherein: and the switching-on and switching-off module contact (11) is a normally open contact and is controlled by the excitation of a switching-on coil and a switching-off coil of the switching-on and switching-off module 1 SWJ.
3. A power generation unit accident safety equipment electrical control system according to claim 1, wherein: the power-off delay relay ZJ is electrically connected to the contactor starting circuit (1); the power-off delay relay ZJ is connected with the contactor (12) in parallel.
4. A power generation unit accident safety equipment electrical control system according to claim 1, wherein: and one end of the electrifying delay relay SJ is connected with the positive electricity of the control power supply, the other end of the electrifying delay relay SJ is connected with the negative electricity of the control power supply, and the electrifying and the power-off are controlled by the air automatic switch 1 ZK.
5. A power generation unit accident safety equipment electrical control system according to claim 1, wherein: and a contact of the electrifying delay relay SJ and a contact (11) of the opening and closing module are connected to the contactor starting circuit (1) in series and used as an electrifying delay protection contact (21).
6. A power generation unit accident safety equipment electrical control system according to claim 1, wherein: and the contact of the power-off delay relay ZJ and the power-on delay protection contact (21) are connected to the contactor starting circuit (1) in parallel and are used as a power-off maintaining protection contact (22).
7. The electrical control system of a power generating unit emergency security device of claim 5, wherein: the power-on delay protection contact (21) and the power-off maintaining protection contact (22) are normally open contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021444543.XU CN212463099U (en) | 2020-07-21 | 2020-07-21 | Electrical control system of emergency safety equipment of generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021444543.XU CN212463099U (en) | 2020-07-21 | 2020-07-21 | Electrical control system of emergency safety equipment of generator set |
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| Publication Number | Publication Date |
|---|---|
| CN212463099U true CN212463099U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021444543.XU Active CN212463099U (en) | 2020-07-21 | 2020-07-21 | Electrical control system of emergency safety equipment of generator set |
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- 2020-07-21 CN CN202021444543.XU patent/CN212463099U/en active Active
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