CN111404259B - Security section power supply system of generator set and switching method thereof - Google Patents
Security section power supply system of generator set and switching method thereof Download PDFInfo
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- CN111404259B CN111404259B CN202010287442.4A CN202010287442A CN111404259B CN 111404259 B CN111404259 B CN 111404259B CN 202010287442 A CN202010287442 A CN 202010287442A CN 111404259 B CN111404259 B CN 111404259B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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Abstract
The invention discloses a security section power supply system of a generator set and a switching method thereof, wherein the security section power supply system comprises an off-plant security isolation transformer, a first security section power supply unit and a second security section power supply unit, wherein the first security section power supply unit and the second security section power supply unit respectively comprise a first off-plant security isolation transformer low-voltage side switch, a first generator set 400V security PC section first incoming line switch, a generator set unit, a first power supply module and a second power supply module.
Description
Technical Field
The invention belongs to the technical field of a security section power supply system of a generator set, and relates to a security section power supply system of the generator set and a switching method thereof.
Background
The safety section bus is connected with an important load for ensuring the safe shutdown of the generator set, and the power failure of the safety section power supply is one of the most serious faults. The backup power supply of the security section power supply system of the conventional generator set is only provided with a diesel generator set, and is not provided with an off-plant security isolation transformer, and meanwhile, the switching logic of the security section power supply system is usually realized by a PLC (programmable logic controller), a backup automatic switching device or an ASICO (automatic switch on-chip) switch, and the following problems mainly exist in the configuration of the type:
(1) poor safety: the backup power supply is only provided with the diesel generating set, when the power supply of the security section of the generating set loses power, the power supply can be provided only by the diesel generating set, and the backup power supply is single.
(1) Poor reliability: in the technical specification of industrial power design of a thermal power plant (DL/T5153-2014), the diesel generating set is required to adopt the emergency of quick self-starting, and the time for recovering power supply from self-starting for the first time after power loss can be 15-20 s. In the self-starting process of the diesel generator set, the bus of the security section is in a power-off state, and the power-off time is long.
(2) Poor flexibility: the switching starting mode is single, the switching mode is single, and the closing mode is single.
In summary, the safety section power supply system of the existing generator set is difficult to meet the requirements of safety, reliability and flexibility of the power system at the present stage. Therefore, the power generating set adopts a multi-backup power supply, and the security section power supply system with high switching logic flexibility has important significance for stable operation of the power generating set and safe shutdown of the power generating set.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a security section power supply system of a generator set and a switching method thereof, and the system and the switching method thereof can effectively improve the safety, reliability and flexibility of the security section power supply system.
In order to achieve the purpose, the security section power supply system of the generator set comprises an off-plant security isolation transformer, a first security section power supply unit and a second security section power supply unit, wherein the first security section power supply unit and the second security section power supply unit respectively comprise a first off-plant security isolation transformer low-voltage side switch, a first generator set 400V security PC section first incoming line switch, a generator set unit, a first power supply module and a second power supply module;
the first power supply module comprises a first generator set 400V security MCC1A section, a first generator set 400V security MCC1A section first incoming line switch, a first generator set 400V security MCC1A section second incoming line switch, a first generator set 400V security MCC1A section power supply, a first generator set 400V security MCC1A section fast switching device, a first generator set 400V security MCC1A section third incoming line switch and a first generator set 400V security MCC1A section fast switching device;
the second power supply module comprises a first generator set 400V security MCC1B section, a first generator set 400V security MCC1B section first incoming line switch, a first generator set 400V security MCC1B section second incoming line switch, a first generator set 400V security MCC1B section power supply, a first generator set 400V security MCC1B section fast switching device, a first generator set 400V security MCC1B section third incoming line switch and a first generator set 400V security MCC1B section fast switching device;
the generator set unit comprises a first generator set diesel generator set, a first feeder switch of a 400V security PC section of the first generator set, a second feeder switch of a 400V security PC section of the first generator set and a second inlet switch of a 400V security PC section of the first generator set;
the high-voltage side of the factory external security isolation transformer is connected with a factory external high-voltage line, the low-voltage side of the factory external security isolation transformer is connected with a 400V security PC section of a generator set through a 400V security PC section first incoming line switch of the generator set, the 400V security PC section of the generator set is connected with a 400V security MCC1A section of the generator set through a 400V security PC section first feeder switch of the generator set and a 400V security MCC1A section third incoming line switch of the generator set, and the 400V security PC section of the generator set is connected with a 400V security MCC1B section of the generator set through a 400V security PC section second feeder switch of the generator set and a 400V security MCC1B section third incoming line switch of the generator set;
a first generator set 400V security MCC1A section power supply is connected with a first generator set 400V security MCC1A section through a first generator set 400V security MCC1A section first incoming line switch, a first generator set 400V security MCC1A section power supply is connected with a first generator set 400V security MCC1A section through a first generator set 400V security MCC1A section second incoming line switch, a first generator set 400V security MCC1B section power supply is connected with a first generator set 400V security MCC1B section through a first generator set 400V security MCC1B section first incoming line switch, and a first generator set 400V security MCC1B section power supply is connected with a first generator set 400V security MCC1B section through a first generator set 400V security MCC1B section second incoming line switch;
the first generator set diesel generator set is connected with the first generator set 400V security PC section through a second inlet switch of the first generator set 400V security PC section;
the first generator set 400V security MCC1A section quick switching device is connected with a first inlet switch of a first generator set 400V security MCC1A section, a second inlet switch of a first generator set 400V security MCC1A section, a first generator set diesel generator set and a first inlet switch of a first generator set 400V security PC section; a second quick switching device of the first generator set 400V security MCC1A section is connected with a first inlet switch of the first generator set 400V security MCC1A section and a second inlet switch of the first generator set 400V security MCC1A section;
a first generator set 400V security MCC1B section fast switching device is connected with a first generator set 400V security MCC1B section first incoming line switch, a first generator set 400V security MCC1B section second incoming line switch, a first generator set diesel generator set and a first generator set 400V security PC section first incoming line switch, and a first generator set 400V security MCC1B section fast switching device is connected with a first generator set 400V security MCC1B section first incoming line switch and a first generator set 400V security MCC1B section second incoming line switch.
A400V security MCC1A section power supply of a first generating set is connected with a 400V security MCC1A section first incoming line switch of the first generating set through a 400V security MCC1A section power supply-feeder switch of the first generating set.
The first generator set 400V security MCC1A section power supply II is connected with the first generator set 400V security MCC1A section second inlet wire switch through the first generator set 400V security MCC1A section power supply II feeder switch.
A400V security MCC1B section power supply of a first generating set is connected with a 400V security MCC1B section first incoming line switch of the first generating set through a 400V security MCC1B section power supply-feeder switch of the first generating set.
The first generator set 400V security MCC1B section power supply II is connected with the first generator set 400V security MCC1B section second inlet wire switch through the first generator set 400V security MCC1B section power supply II feeder switch.
An outlet switch of the first generator set diesel generator set is arranged at an outlet of the first generator set diesel generator set.
The low-voltage side of the factory external security isolation transformer is connected with a first inlet wire switch of a 400V security PC section of the first generating set through a first low-voltage side switch of the factory external security isolation transformer.
The switching method of the security section power supply system of the generator set has the advantages that the switching modes of the first power supply module and the second power supply module are the same, and the specific switching process of the first power supply module is as follows:
1) carrying out early preparation work of switching a security section power supply system of a first generator set;
2) the first generator set 400V security MCC1A section is supplied with power by a first generator set 400V security MCC1A section power supply;
3) monitoring the voltage state of a first generator set 400V security MCC1A section, when the voltage of the first generator set 400V security MCC1A section is abnormal, indicating that a power supply of the first generator set 400V security MCC1A section has a fault, turning to the step 4), otherwise, turning to the step 15);
4) monitoring the state of a second 400V security MCC1A section power supply of the first generator set, and turning to the step 5) when the second 400V security MCC1A section power supply of the first generator set is normal and has no fault, or turning to the step 8);
5) the 400V security MCC1A section quick switching device II of the first generator set performs switching action, namely a first inlet wire switch of the 400V security MCC1A section of the first generator set is switched off, and a second inlet wire switch of the 400V security MCC1A section of the first generator set is switched on;
6) when the second switching device of the 400V security MCC1A section of the first generator set is successfully switched, the step 7) is carried out, otherwise, the step 8) is carried out;
7) the first generator set 400V security MCC1A section is powered by the first generator set 400V security MCC1A section power supply II, and then the step 15) is carried out;
8) describing that a first generator set 400V security MCC1A section power supply I and a first generator set 400V security MCC1A section power supply II have faults at the same time, and turning to the step 9);
9) a 400V security MCC1A section fast switching device I1 of a first generator set performs switching action;
10) monitoring the state of a first inlet switch of a 400V security PC section of a first generating set in another security section power supply unit, turning to the step 13 when the first inlet switch of the 400V security PC section of the first generating set in the other security section power supply unit is in a switching-on position, and turning to the step 11 when the first inlet switch of the 400V security PC section of the first generating set in the other security section power supply unit is in a switching-off position);
11) judging whether the voltage of the upper port of the first inlet wire switch of the 400V security PC section of the first generator set is normal, and turning to the step 12) when the voltage of the upper port of the first inlet wire switch of the 400V security PC section of the first generator set is normal, or turning to the step 13);
12) switching the 400V security MCC1A section of the first generator set to be supplied with power by an off-plant security isolation transformer, and then turning to the step 15);
13) starting a first generator set diesel generator set;
14) switching the 400V security MCC1A section of the first generator set to be supplied with power by the diesel generator set of the first generator set, and then turning to the step 15);
15) no. one generating set 400V security MCC1A section recovers power supply.
The second quick switching device for the first generator set 400V security MCC1A section monitors the bus voltage of the first generator set 400V security MCC1A section, the incoming line voltage of the first generator set 400V security MCC1A section power supply and the incoming line switch state in real time, and judges whether the first generator set 400V security MCC1A section power supply fails or not;
the second generator set 400V security MCC1A section quick switching device monitors the bus voltage of the first generator set 400V security MCC1A section, the incoming line voltage of the first generator set 400V security MCC1A section power supply II and the incoming line switch state in real time, and judges whether the first generator set 400V security MCC1A section power supply II breaks down or not.
Step 9), a switching action of the 400V security MCC1A section fast switching device of the first generator set is performed, at this time, when the first inlet switch of the 400V security PC section of the first generating set in the other security section power supply unit is at the opening position and the voltage of the upper port of the first inlet switch of the 400V security PC section of the first generating set is normal, the first generator set 400V security MCC1A section fast switching device is preferentially switched to the outside plant security isolation transformer to provide power for the first generator set 400V security MCC1A section, only when the first inlet switch of the first generator set 400V security PC section in the other security section power supply unit is in the switching-on position or the voltage of the first inlet switch of the first generator set 400V security PC section is abnormal, then the diesel generator set of the first generator set is switched to provide power for the 400V security MCC1A section of the first generator set.
The invention has the following beneficial effects:
when the security section power supply system of the generator set and the switching method thereof are operated specifically, an off-site security isolation transformer is adopted as a backup power supply of the security section power supply system, when a 400V security MCC1A section power supply I of a generator set and a 400V security MCC1A section power supply II of the generator set are both powered off, the off-site security isolation transformer is preferentially selected as the security section power supply to shorten the power off time of the security section, when the off-site security isolation transformer cannot provide power for the security MCC section, a diesel generator set of the generator set is selected as the security section power supply, and meanwhile, the switching among all power supply sources is realized through a switch, so that the switching is convenient, the safety, the reliability and the flexibility are strong, the system can be suitable for different types of generator sets, is convenient to popularize and use on site, and ensures the.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention.
Wherein, 1 is a first generator set 400V security MCC1A section fast switching device I, 2 is a first generator set 400V security MCC1A section fast switching device II, 3 is a first generator set 400V security MCC1B section fast switching device I, 4 is a first generator set 400V security MCC1B section fast switching device II, 5 is a first generator set 400V security MCC1A section, 6 is a first generator set 400V security MCC1B section, 7 is a first generator set 400V security PC section, 8 is a first generator set 400V security MCC1A section power supply I, 9 is a first generator set 400V security MCC1A section power supply II, 10 is a first generator set 400V security MCC1B section power supply I, 11 is a first generator set 400V security MCC1B section power supply II, 12 is a first generator set diesel generator set, 13 is an outside plant security isolation transformer, 14 is a first inlet switch of 400V security MCC1A section of a first generator set, 15 is a second inlet switch of 400V security MCC1A section of the first generator set, 16 is a third inlet switch of 400V security MCC1A section of the first generator set, 17 is a first inlet switch of 400V security PC section of the first generator set, 18 is a first inlet switch of 400V security MCC1B section of the first generator set, 19 is a second inlet switch of 400V security MCC1B section of the first generator set, 20 is a third inlet switch of 400V security MCC1B section of the first generator set, 21 is a first low-voltage side switch of an outside security isolation transformer, 22 is a first feeder switch of 400V security MCC1A section of a first generator set, 23 is a second feeder switch of 400V security MCC1A section of the first generator set, 24 is a first feeder switch of 400V security MCC1B section of the first generator set, 25 is a second feeder switch of 400V security MCC1B section of the first generator set, and a second feeder switch of the first and the second, 26 is a second inlet switch of a 400V security PC section of a first generator set, 27 is a first feeder switch of a 400V security PC section of the first generator set, 28 is a second feeder switch of a 400V security PC section of the first generator set, and 29 is an outlet switch of a diesel generator set of the first generator set.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the safety section power supply system of the generator set of the present invention includes an outside plant safety isolation transformer 13, a first safety section power supply unit and a second safety section power supply unit, where the first safety section power supply unit and the second safety section power supply unit both include a first outside plant safety isolation transformer low-voltage side switch 21, a first generator set 400V safety PC section first incoming line switch 17, a generator set unit, a first power supply module and a second power supply module; the first power supply module comprises a first generator set 400V security MCC1A section 5, a first generator set 400V security MCC1A section first incoming line switch 14, a first generator set 400V security MCC1A section second incoming line switch 15, a first generator set 400V security MCC1A section power supply I8, a first generator set 400V security MCC1A section power supply II 9, a first generator set 400V security MCC1A section fast switching device I1, a first generator set 400V security MCC1A section third incoming line switch 16 and a first generator set 400V security MCC1A section fast switching device II 2; the second power supply module comprises a first generator set 400V security MCC1B section 6, a first generator set 400V security MCC1B section first incoming line switch 18, a first generator set 400V security MCC1B section second incoming line switch 19, a first generator set 400V security MCC1B section power supply I10, a first generator set 400V security MCC1B section power supply II 11, a first generator set 400V security MCC1B section fast switching device I3, a first generator set 400V security MCC1B section third incoming line switch 20 and a first generator set 400V security MCC1B section fast switching device II 4; the generator set unit comprises a first generator set diesel generator set 12, a first generator set 400V security PC section first feeder switch 27, a first generator set 400V security PC section second feeder switch 28 and a first generator set 400V security PC section second inlet switch 26; the high-voltage side of the factory external security isolation transformer 13 is connected with a factory external high-voltage line, the low-voltage side of the factory external security isolation transformer 13 is connected with a first generator set 400V security PC section 7 through a first generator set 400V security PC section first incoming line switch 17, the first generator set 400V security PC section 7 is connected with a first generator set 400V security MCC1A section 5 through a first generator set 400V security PC section first feeder line switch 27 and a first generator set 400V security MCC1A section third incoming line switch 16, the first generator set 400V security PC section 7 is connected with a first generator set 400V security MCC1A section 6 through a first generator set 400V security PC section second feeder line switch 28 and a first generator set 400V security MCC1B section third incoming line switch 20; a first generator set 400V security MCC1A section power supply I8 is connected with a first generator set 400V security MCC1A section 5 through a first generator set 400V security MCC1A section first incoming line switch 14, a first generator set 400V security MCC1A section power supply II 9 is connected with a first generator set 400V security MCC1A section 5 through a first generator set 400V security MCC1A section second incoming line switch 15, a first generator set 400V security MCC1B section power supply I10 is connected with a first generator set 400V security MCC1B section 6 through a first generator set 400V security MCC1B section first incoming line switch 18, a first generator set 400V security MCC1B section power supply II 11 is connected with a first generator set 400V security MCC1B section 6 through a first generator set 400V security MCC1B section second incoming line switch 19; the first generator set diesel generator set 12 is connected with the first generator set 400V security PC section 7 through a second inlet wire switch 26 of the first generator set 400V security PC section; a first generator set 400V security MCC1A section fast switching device I1 is connected with a first inlet switch 14 of a first generator set 400V security MCC1A section, a second inlet switch 15 of a first generator set 400V security MCC1A section, a first generator set diesel generator set 12 and a first inlet switch 17 of a first generator set 400V security PC section; the second 400V security MCC1A section quick switching device 2 of the first generator set is connected with a first inlet wire switch 14 of the 400V security MCC1A section of the first generator set and a second inlet wire switch 15 of the 400V security MCC1A section of the first generator set; first generator set 400V security MCC1B section fast switching device 3 is connected with first generating set 400V security MCC1B section first incoming line switch 18, first generator set 400V security MCC1B section second incoming line switch 19, first generator set diesel generating set 12 and first generating set 400V security PC section first incoming line switch 17, first generator set 400V security MCC1B section fast switching device two 4 is connected with first generating set 400V security MCC1B section first incoming line switch 18 and first generator set 400V security MCC1B section second incoming line switch 19.
A first generator set 400V security MCC1A section power supply I8 is connected with a first generator set 400V security MCC1A section first inlet wire switch 14 through a first generator set 400V security MCC1A section power supply I feeder switch 22; the second 400V security MCC1A section power supply 9 of the first generator set is connected with the second 400V security MCC1A section power supply incoming switch 15 of the first generator set through the second 400V security MCC1A section power supply feeder switch 23 of the first generator set; a first generator set 400V security MCC1B section power supply I10 is connected with a first generator set 400V security MCC1B section first inlet wire switch 18 through a first generator set 400V security MCC1B section power supply I feeder switch 24; the second 400V security MCC1B power supply 11 of the first generator set is connected with the second inlet wire switch 19 of the 400V security MCC1B power supply of the first generator set through the second feeder switch 25 of the 400V security MCC1B power supply of the first generator set; an outlet switch 29 of the first generator set diesel generator set is arranged at the outlet of the first generator set diesel generator set 12; the low-voltage side of the factory external security isolation transformer 13 is connected with a first inlet wire switch 17 of a 400V security PC section of the first generating set through a first 21 low-voltage side switch of the factory external security isolation transformer.
Under the normal operation condition, the first generator set 400V security MCC1A section 5 is powered by a first generator set 400V security MCC1A section power supply I8 or a first generator set 400V security MCC1A section power supply II 9; when the first generator set 400V security MCC1A section 5 is powered by the first generator set 400V security MCC1A section power supply I8, the first inlet wire switch 14 of the first generator set 400V security MCC1A section is in a closed position; when the first generator set 400V security MCC1A section 5 is powered by the first generator set 400V security MCC1A section power supply II 9, the first generator set 400V security MCC1A section second incoming line switch 15 is in a closed position; the 400V security MCC1A section third inlet switch 16 of the first generator set is always in a separate position; the first generator set 400V security MCC1B section 6 is consistent with the first generator set 400V security MCC1A section 5 in design and has the same structure;
the 400V safety MCC1A section fast switching device II 2 of the first generator set can realize manual starting switching, protective starting switching, error jump starting switching and no-voltage starting switching, and realize fast switching, simultaneous catching switching, residual voltage switching and long delay switching through parallel switching, serial switching and simultaneous switching; when a first generator set 400V security MCC1A section power supply I8 or a first generator set 400V security MCC1A section power supply II 9 loses power, a first generator set 400V security MCC1A section fast switching device II 2 switches to act, and the first generator set 400V security MCC1A section power supply I8 and the first generator set 400V security MCC1A section power supply II 9 are switched to select through bidirectional switching between a first generator set 400V security MCC1A section first incoming line switch 14 and a first generator set 400V security MCC1A section second incoming line switch 15; the second 400V security MCC1B section quick-cutting device 4 of the first generator set is consistent with the second 400V security MCC1A section quick-cutting device 2 of the first generator set in structure and has the same function;
the 400V safety MCC1A section fast switching device I1 of the first generator set can realize manual starting switching, protection starting switching, error jump starting switching and no-voltage starting switching, and realize fast switching, simultaneous catching switching, residual voltage switching and long delay switching through parallel switching, serial switching and simultaneous switching; under the condition that a first generator set 400V security MCC1A section power supply I8 and a first generator set 400V security MCC1A section power supply II 9 are both out of power, a first generator set 400V security MCC1A section quick switching device I1 performs switching action, and a first generator set 400V security MCC1A section first incoming line switch 14 and a first generator set 400V security MCC1A section second incoming line switch 15 are tripped; at this time, when the first inlet switch 17 of the 400V security PC section of the first generator set in the other security section power unit is not closed and the low-voltage side of the security isolation transformer 13 outside the plant is electrified, the first generator set 400V security MCC1A section quick-switching device 1 is closed with the third inlet switch 16 of the 400V security MCC1A section of the first generator set and the first inlet switch 17 of the 400V security PC section of the first generator set, and the 400V security MCC1A section 5 of the first generator set is powered by the security isolation transformer 13 outside the plant; at this time, if the first inlet switch 17 of the first generator set 400V security PC section in the other security section power supply unit is closed or the low-voltage side of the security isolation transformer 13 is electroless, the first generator set 400V security MCC1A section quick switching device 1 is closed to the third inlet switch 16 of the first generator set 400V security MCC1A section, and simultaneously the first generator set diesel generator set 12 is started, and the first generator set 400V security MCC1A section 5 is powered by the first generator set diesel generator set 12; when a first generator set 400V security MCC1A section power supply I8 and a first generator set 400V security MCC1A section power supply II 9 are recovered to be normal, a first generator set 400V security MCC1A section fast switching device I1 is synchronously switched on a first generator set 400V security MCC1A section first incoming line switch 14 or a first generator set 400V security MCC1A section second incoming line switch 15, a first generator set 400V security MCC1A section third incoming line switch 16 is switched off, and a first generator set 400V security MCC1A section 5 is recovered to be supplied with power by a first generator set 400V security MCC1A section power supply I8 or a first generator set 400V security MCC1A section power supply II 9; the first generator set 400V security MCC1B section quick-cutting device I3 and the first generator set 400V security MCC1A section quick-cutting device I1 have the same structure and the same function.
Under the normal operation condition, the first generator set 400V security MCC1A section power supply one feeder switch 22, the first generator set 400V security MCC1A section power supply two feeder switch 23, the first generator set 400V security MCC1B section power supply one feeder switch 24, the first generator set 400V security MCC1B section power supply two feeder switch 25, the first generator set 400V security PC section second inlet wire switch 26, the first generator set 400V security PC section first feeder switch 27, the first generator set 400V security PC section second feeder switch 28 and the factory outside security isolation transformer low voltage side switch 21 are all in the closed position, the first generator set diesel generator set outlet switch 29 is in the open position, when the starting voltage of the first generator set diesel generator set 12 reaches the rated voltage, the first generator set diesel generator set outlet switch 29 is automatically switched on.
The switching method of the security section power supply system of the generator set has the advantages that the switching modes of the first power supply module and the second power supply module are the same, and the specific switching process of the first power supply module is as follows:
1) carrying out early preparation work of switching a security section power supply system of a first generator set;
2) the first generator set 400V security MCC1A section 5 is powered by a first generator set 400V security MCC1A section power supply I8;
3) monitoring the voltage state of a 400V security MCC1A section 5 of the first generator set, and when the voltage of the 400V security MCC1A section 5 of the first generator set is abnormal, indicating that a power supply I8 of the 400V security MCC1A section of the first generator set fails, turning to the step 4), otherwise, turning to the step 15);
4) monitoring the state of a second 400V security MCC1A power supply 9 of the first generator set, and turning to the step 5) when the second 400V security MCC1A power supply 9 of the first generator set is normal and has no fault, or turning to the step 8);
5) the 400V security MCC1A section quick switching device 2 of the first generator set performs switching action, namely a first inlet wire switch 14 of the 400V security MCC1A section of the first generator set is switched off, and a second inlet wire switch 15 of the 400V security MCC1A section of the first generator set is switched on;
6) when the 400V security MCC1A section fast switching device II 2 of the first generator set is successfully switched, the step 7) is carried out, otherwise, the step 8) is carried out;
7) the first generator set 400V security MCC1A section 5 is powered by a first generator set 400V security MCC1A section power supply II 9, and then the step 15) is carried out;
8) describing that the first generator set 400V security MCC1A section power supply I8 and the first generator set 400V security MCC1A section power supply II 9 have faults at the same time, and turning to the step 9);
9) a 400V security MCC1A section fast switching device I1 of a first generator set performs switching action;
10) monitoring the state of the first inlet switch 17 of the 400V security PC section of the first power generating set in the other security section power supply unit, turning to the step 13 when the first inlet switch 17 of the 400V security PC section of the first power generating set in the other security section power supply unit is in a switching-on position, and turning to the step 11 when the first inlet switch 17 of the 400V security PC section of the first power generating set in the other security section power supply unit is in a switching-off position);
11) judging whether the voltage of the upper port of the first inlet switch 17 of the 400V security PC section of the first generator set is normal, and turning to the step 12) when the voltage of the upper port of the first inlet switch 17 of the 400V security PC section of the first generator set is normal, or turning to the step 13);
12) switching the 400V security MCC1A section 5 of the first generator set to be supplied with power by an off-plant security isolation transformer 13, and then turning to the step 15);
13) starting a first generator set diesel generator set 12;
14) switching the 400V security MCC1A section 5 of the first generator set to be supplied with power by the diesel generator set 12 of the first generator set, and then turning to the step 15);
15) the 400V security MCC1A section 5 of the first generator set recovers power supply.
The first generator set 400V security MCC1A section fast switching device II 2 monitors the bus voltage of the first generator set 400V security MCC1A section 5, the incoming line voltage of the first generator set 400V security MCC1A section power supply I8 and the incoming line switch state in real time, and judges whether the first generator set 400V security MCC1A section power supply I8 has a fault or not; the first generator set 400V security MCC1A section fast switching device II 2 monitors the bus voltage of the first generator set 400V security MCC1A section 5, the incoming line voltage of the first generator set 400V security MCC1A section power supply II 9 and the incoming line switch state in real time, and judges whether the first generator set 400V security MCC1A section power supply II 9 has a fault or not.
Step 9), the 400V security MCC1A section fast switching device of the first generator set is switched to 1, at this time, when the first inlet switch 17 of the 400V security PC section of the first generating set in the other security section power supply unit is in the opening position, and the voltage of the upper port of the first inlet wire switch 17 of the 400V security PC section of the first generating set is normal, the first generator set 400V security MCC1A section fast switching device one 1 is preferentially switched to provide power for the first generator set 400V security MCC1A section 5 by the off-plant security isolation transformer 13, only when the first inlet switch 17 of the first generator set 400V security PC section in the other security section power supply unit is in the switching-on position or the voltage of the upper port of the first inlet switch 17 of the first generator set 400V security PC section is abnormal, then switch to the 400V security MCC1A section 5 from genset number one diesel genset 12.
The specific operation of the step 1) is as follows:
101) according to a design drawing, finishing the installation work of primary equipment and secondary equipment of a safety section power supply system, checking to determine that secondary wiring is correct and reliable, and confirming that CT has no open circuit phenomenon and PT has no short circuit phenomenon;
102) the transmission acceptance of each 400V switch of the security section power supply system is carried out, and the acceptance result is qualified;
103) carrying out static debugging on a first generator set 400V security MCC1A section quick-cutting device I1 and a first generator set 400V security MCC1A section quick-cutting device II 2, and carrying out a transmission test;
104) a first generator set 400V security MCC1A section fast switching device I1 and a first generator set 400V security MCC1A section fast switching device II 2 are formally assigned with a fixed value list, and the fixed value is input according to the assigned fixed value list;
105) and (5) carrying out insulation test on the power supply system in the security section, wherein the test result is qualified.
Claims (10)
1. A security section power supply system of a generator set is characterized by comprising an off-plant security isolation transformer (13), a first security section power supply unit and a second security section power supply unit, wherein the first security section power supply unit and the second security section power supply unit respectively comprise a first off-plant security isolation transformer low-voltage side switch (21), a first generator set 400V security PC section first incoming line switch (17), a generator set unit, a first power supply module and a second power supply module;
the first power supply module comprises a first generator set 400V security MCC1A section (5), a first generator set 400V security MCC1A section first incoming line switch (14), a first generator set 400V security MCC1A section second incoming line switch (15), a first generator set 400V security MCC1A section power supply I (8), a first generator set 400V security MCC1A section power supply II (9), a first generator set 400V security MCC1A section fast switching device I (1), a first generator set 400V security MCC1A section third incoming line switch (16) and a first generator set 400V security MCC1A section fast switching device II (2);
the second power supply module comprises a first generator set 400V security MCC1B section (6), a first generator set 400V security MCC1B section first incoming line switch (18), a first generator set 400V security MCC1B section second incoming line switch (19), a first generator set 400V security MCC1B section power supply I (10), a first generator set 400V security MCC1B section power supply II (11), a first generator set 400V security MCC1B section fast switching device I (3), a first generator set 400V security MCC1B section third incoming line switch (20) and a first generator set 400V security MCC1B section fast switching device II (4);
the generator set unit comprises a first generator set diesel generator set (12), a first feeder switch (27) of a first generator set 400V security PC section, a second feeder switch (28) of a first generator set 400V security PC section and a second inlet switch (26) of a first generator set 400V security PC section;
the high-voltage side of an off-site security isolation transformer (13) is connected with an off-site high-voltage line, the low-voltage side of the off-site security isolation transformer (13) is connected with a first generator set 400V security PC section (7) through a first generator set 400V security PC section first incoming line switch (17), the first generator set 400V security PC section (7) is connected with a first generator set 400V security MCC1A section (5) through a first generator set 400V security PC section first feeder line switch (27) and a first generator set 400V security MCC1A section third incoming line switch (16), and the first generator set 400V security PC section (7) is connected with a first generator set 400V security MCC1B section (6) through a first generator set 400V security PC section second feeder line switch (28) and a first generator set 400V security MCC1B section third incoming line switch (20);
the first generator set 400V security MCC1A section power supply I (8) is connected with the first generator set 400V security MCC1A section (5) through the first inlet wire switch (14) of the first generator set 400V security MCC1A section, a first generator set 400V security MCC1A section power supply II (9) is connected with a first generator set 400V security MCC1A section (5) through a first generator set 400V security MCC1A section second incoming line switch (15), a first generator set 400V security MCC1B section power supply I (10) is connected with a first generator set 400V security MCC1B section (6) through a first generator set 400V security MCC1B section first incoming line switch (18), a second 400V security MCC1B section power supply (11) of the first generator set is connected with a 400V security MCC1B section (6) of the first generator set through a second inlet wire switch (19) of the 400V security MCC1B section of the first generator set;
a first generator set diesel generator set (12) is connected with a first generator set 400V security PC section (7) through a second inlet wire switch (26) of the first generator set 400V security PC section;
the first generator set 400V security MCC1A section fast switching device (1) is connected with a first inlet switch (14) of a first generator set 400V security MCC1A section, a second inlet switch (15) of a first generator set 400V security MCC1A section, a first generator set diesel generator set (12) and a first inlet switch (17) of a first generator set 400V security PC section; a second quick-switching device (2) of the first generator set 400V security MCC1A section is connected with a first inlet switch (14) of the first generator set 400V security MCC1A section and a second inlet switch (15) of the first generator set 400V security MCC1A section;
a first generator set 400V security MCC1B section fast switching device (3) is connected with a first generator set 400V security MCC1B section first incoming line switch (18), a first generator set 400V security MCC1B section second incoming line switch (19), a first generator set diesel generator set (12) and a first generator set 400V security PC section first incoming line switch (17), and a first generator set 400V security MCC1B section fast switching device (4) is connected with a first generator set 400V security MCC1B section first incoming line switch (18) and a first generator set 400V security MCC1B section second incoming line switch (19).
2. The safety section power supply system of a generator set according to claim 1, wherein a first generator set 400V safety MCC1A section power supply one (8) is connected to a first inlet switch (14) of a first generator set 400V safety MCC1A section power supply one feeder switch (22).
3. The safety section power supply system of a generator set according to claim 1, wherein the second segment power supply (9) of the first generator set 400V safety MCC1A is connected to the second segment incoming line switch (15) of the first generator set 400V safety MCC1A via the second segment power supply feeder switch (23) of the first generator set 400V safety MCC 1A.
4. The safety section power supply system of a generator set according to claim 1, wherein a first generator set 400V safety MCC1B section power supply one (10) is connected to a first generator set 400V safety MCC1B section first inlet switch (18) via a first generator set 400V safety MCC1B section power supply one feeder switch (24).
5. The safety section power supply system of a generator set according to claim 1, wherein the second segment power supply (11) of the first generator set 400V safety MCC1B is connected to the second incoming line switch (19) of the first generator set 400V safety MCC1B via the second segment power supply feeder switch (25) of the first generator set 400V safety MCC 1B.
6. The crowbar power supply system of a genset in accordance with claim 1 wherein a genset diesel generator set outlet switch (29) is provided at an outlet of the genset diesel generator set (12).
7. The safety section power supply system of the generator set according to claim 1, wherein the low voltage side of the factory external safety isolation transformer (13) is connected with the first inlet switch (17) of the 400V safety PC section of the first generator set through a first (21) of a first low voltage side switch of the factory external safety isolation transformer.
8. A switching method of a security segment power supply system of a generator set according to claim 1, wherein the switching modes of the first power supply module and the second power supply module are the same, and the specific switching process of the first power supply module is as follows:
1) carrying out early preparation work of switching a security section power supply system of a first generator set;
2) the first generator set 400V security MCC1A section (5) is powered by a first generator set 400V security MCC1A section power supply I (8);
3) monitoring the voltage state of a first generator set 400V security MCC1A section (5), when the voltage of the first generator set 400V security MCC1A section (5) is abnormal, indicating that a first generator set 400V security MCC1A section power supply (8) has a fault, turning to step 4), otherwise, turning to step 15);
4) monitoring the state of a second 400V security MCC1A section power supply (9) of the first generator set, and turning to the step 5) when the second 400V security MCC1A section power supply (9) of the first generator set is normal and has no fault, or turning to the step 8);
5) the second quick-switching device (2) of the first generator set 400V security MCC1A section performs switching action, namely a first inlet switch (14) of the first generator set 400V security MCC1A section is switched off, and a second inlet switch (15) of the first generator set 400V security MCC1A section is switched off;
6) when the switching of the second quick switching device (2) of the first generator set 400V security MCC1A section is successful, turning to the step 7), otherwise, turning to the step 8);
7) the first generator set 400V security MCC1A section (5) is powered by a first generator set 400V security MCC1A section power supply II (9), and then the step 15 is carried out;
8) describing that a first generator set 400V security MCC1A section power supply I (8) and a first generator set 400V security MCC1A section power supply II (9) have faults at the same time, and turning to step 9);
9) the 400V security MCC1A section fast switching device I (1) of the first generator set performs switching action;
10) monitoring the state of a first inlet switch (17) of a 400V security PC section of a first generating set in another security section power unit, turning to a step 13 when the first inlet switch (17) of the 400V security PC section of the first generating set in the other security section power unit is in a switching-on position, and turning to a step 11 when the first inlet switch (17) of the 400V security PC section of the first generating set in the other security section power unit is in a switching-off position;
11) judging whether the voltage of the upper port of the first inlet switch (17) of the 400V security PC section of the first generator set is normal, when the voltage of the upper port of the first inlet switch (17) of the 400V security PC section of the first generator set is normal, turning to the step 12), otherwise, turning to the step 13);
12) switching a 400V security MCC1A section (5) of the first generator set to be supplied with power by an off-plant security isolation transformer (13), and then turning to the step 15);
13) starting a first generator set diesel generator set (12);
14) switching a 400V security MCC1A section (5) of a first generator set to be supplied with power by a diesel generator set (12) of the first generator set, and then turning to the step 15);
15) the 400V security MCC1A section (5) of the first generator set recovers power supply.
9. The switching method of safety section power supply system of generator set according to claim 8, wherein the second fast switching device (2) of the first generator set 400V safety MCC1A section monitors the bus voltage of the first generator set 400V safety MCC1A section (5), the incoming line voltage of the first generator set 400V safety MCC1A section power supply one (8) and the incoming line switch state in real time, and determines whether the first generator set 400V safety MCC1A section power supply one (8) is faulty;
the first generator set 400V security MCC1A section fast switching device II (2) monitors the bus voltage of the first generator set 400V security MCC1A section (5), the incoming line voltage of the first generator set 400V security MCC1A section power supply II (9) and the incoming line switch state in real time, and judges whether the first generator set 400V security MCC1A section power supply II (9) breaks down or not.
10. The switching method of the safety section power supply system of the generator set according to claim 8, wherein in step 9), when the first safety section power supply unit 400V safety PC section first inlet switch (17) in the other safety section power supply unit is in the open position and the voltage at the first inlet switch (17) of the first safety section PC section of the generator set 400V safety PC section is normal, the first safety section power supply unit 400V safety MCC1A section quick switching device (1) is preferentially switched to the off-plant safety isolation transformer (13) to supply power to the first safety section MCC1A of the generator set 400V safety section (5), and only when the first safety section PC section first inlet switch (17) in the other safety section power supply unit is in the close position or the voltage at the first inlet switch (17) of the safety section PC section of the generator set 400V safety section is abnormal, then the power supply of the 400V security MCC1A section (5) of the first generator set is switched to be provided by the first generator set diesel generator set (12).
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| CN113783292A (en) * | 2021-09-01 | 2021-12-10 | 泰州锋陵特种电站装备有限公司 | Method for realizing multi-path parallel switching of parallel controller |
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