The cold soft starting device of high voltage direct current transmission valve
Technical field
The present invention relates to the control and the protective device of the cold main circulation pump of high voltage direct current transmission valve, particularly the cold soft starting device of high voltage direct current transmission valve.
Background technology
Traditional water-cooling system main circulation pump starting drive has following shortcoming: (1) direct-on-line starting device, main circulation pump have problems such as the water of switching water hammer effect is big, and impulse current is big; (2) traditional varying frequency starting device is after main circulation pump is accomplished variable frequency starting; When power frequency is switched; Because the unusual impulse current of the uncertain generation of voltage phase angle damages problems such as starting drive, therefore; Be necessary to develop a kind of new cold soft starting device of high voltage direct current transmission valve, adapt to the requirement of the cold main circulation pump of high voltage direct current transmission valve.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art; Provide a kind of high voltage direct current transmission valve cold soft starting device; Said device is exclusively used in the control and the protection of high voltage direct current transmission converter valve closed pure water cooling system main circulation pump; Its special structure design is that the safe operation of converter valve provides reliable assurance, has higher utility.
The object of the invention is realized through following technical scheme:
The cold soft starting device of high voltage direct current transmission valve; Comprise power loop and control loop; Said power loop comprises soft open loop and bypass, and the soft loop of opening comprises first breaker of plastic casing, soft initiator and first A.C. contactor that connects successively, and bypass comprises second breaker of plastic casing and second A.C. contactor that connects successively; First breaker of plastic casing is parallelly connected with the second breaker of plastic casing input; Be connected with electrical source of power then, first A.C. contactor is parallelly connected with the second A.C. contactor output, connects with thermel protection device and circulating pump then;
Said control loop comprises soft start circuit controls circuit and Bypass Control circuit; Soft start circuit controls circuit and Bypass Control circuit parallel connection access control power supply; Said soft start circuit controls circuit comprises the contact of first breaker of plastic casing, first auxiliary contact, first relay, the contact of second relay and the coil of first A.C. contactor; Said first breaker of plastic casing, first auxiliary contact, the contact of first relay and the coil of first A.C. contactor connect successively; The contact of second relay is parallelly connected with the contact of first relay; Said Bypass Control circuit comprises the contact of second breaker of plastic casing, first auxiliary contact, the 3rd relay, the contact of the 4th relay, the contact of the 5th relay and the coil of second A.C. contactor; Said second breaker of plastic casing, first auxiliary contact, the contact of the 3rd relay and the coil of second A.C. contactor connect successively; The contact of the contact of the 4th relay and the 5th relay is parallelly connected with the contact of the 3rd relay respectively, and the contact of the contact of the contact of said first relay, second relay, the contact of the 4th relay and the 5th relay is the PLC control point;
Said soft initiator inserts electrical source of power through miniature circuit breaker, whether controls the start and stop of soft initiator through the closure of the first A.C. contactor auxiliary contact.
In order better to realize the present invention, said thermel protection device comprises thermal relay and the safety switch that connects successively.
In order better to realize the present invention; Said control loop also comprises first circuit breaker deciliter control circuit; Said first circuit breaker deciliter control circuit comprises first breaker of plastic casing, second auxiliary contact of connection successively and the coil of the 6th relay, and the said soft circuit controls circuit that breaks is parallelly connected with soft start circuit controls circuit and Bypass Control circuit.
In order better to realize the present invention; Said control loop also comprises pump operating cycle indication circuit; Said pump operating cycle indication circuit comprises the first A.C. contactor auxiliary contact, the second A.C. contactor auxiliary contact, the coil of indicator light and the 7th relay; The said second A.C. contactor auxiliary contact are connected with indicator light; The first A.C. contactor auxiliary contact are parallelly connected with the second A.C. contactor auxiliary contact, and the coil of the 7th relay is parallelly connected with indicator light, and said pump operating cycle indication circuit is parallelly connected with soft start circuit controls circuit and Bypass Control circuit.
In order better to realize the present invention; Said control loop also comprises the circulating pump faulty line; Said circulating pump faulty line comprises the coil and the thermal relay auxiliary contact of second breaker of plastic casing, second auxiliary contact, the 8th relay; Connect with the coil of the 8th relay after said second breaker of plastic casing, second auxiliary contact and the parallel connection of thermal relay auxiliary contact, said circulating pump faulty line is parallelly connected with soft start circuit controls circuit and Bypass Control circuit.
In order better to realize the present invention; Said soft initiator is connected to bypass run signal output loop, soft initiator fault-signal output loop and soft initiator run signal output loop, and the coil of the 3rd relay was charged when said bypass moved, the output run signal; The coil of the 9th relay is charged during said soft initiator fault; The output fault-signal, the coil of the tenth relay was charged when said soft initiator moved, the output run signal.
In order better to realize the present invention, the cold soft starting device of said high voltage direct current transmission valve also comprises electric current and voltage display unit, and display unit one end is connected with electrical source of power through the 3rd breaker of plastic casing, and the display unit other end connects in circulating pump.
The invention has the beneficial effects as follows:
(1) the cold soft starting device of high voltage direct current transmission valve provided by the invention, problem such as well having solved direct-on-line starting device main circulation pump, to switch the water water hammer effect big, and impulse current is big;
(2) the cold soft starting device of high voltage direct current transmission valve provided by the invention solved former varying frequency starting device after main circulation pump is accomplished variable frequency starting when power frequency is switched, the unusual impulse current that produces owing to voltage phase angle is uncertain, problems such as damage starting drive;
(3) economy: the cold soft starting device of high voltage direct current transmission valve provided by the invention; Realized that not only the static frequency converter speed change starts, also avoided frequency conversion switching shock electric current, this device has reduced the requirement to motor simultaneously; Directly reduced cost, higher economic value has been arranged;
(4) reliability: the present invention combines the advantage of direct-on-line starting device and varying frequency starting device through effective collocation of soft initiator and power frequency contactor, has improved the reliability of water-cooling system;
(5) fail safe: soft starting device is designed to go out mode under enterprising, thereby the exposed copper bar of having avoided static frequency converter and power frequency starting drive to design has improved fail safe.
Description of drawings
The cold soft starting device power loop of the said high voltage direct current transmission valve of Fig. 1 one embodiment of the present invention circuit diagram;
The cold soft starting device control loop of the said high voltage direct current transmission valve of Fig. 2 one embodiment of the present invention circuit diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing an embodiment of the invention are described in further detail, but execution mode of the present invention is not limited thereto.
The cold soft starting device of high voltage direct current transmission valve; Comprise power loop and control loop, as shown in Figure 1, said power loop comprises soft open loop and bypass; The soft loop of opening comprises successively first breaker of plastic casing 1, soft initiator 2 and first A.C. contactor 3 that connects; Bypass comprises that second breaker of plastic casing 4 and second A.C. contactor, 5, the first breaker of plastic casing 1 that connect successively are parallelly connected with second breaker of plastic casing, 4 inputs, is connected with electrical source of power then; First A.C. contactor 3 is parallelly connected with second A.C. contactor, 5 outputs, connects with thermal relay 5, safety switch 6 and circulating pump 7 then;
Said soft initiator inserts electrical source of power through miniature circuit breaker 8-1,8-2, and miniature circuit breaker 8-1,8-2 are redundant the settings, and whether the using and the reserved control the start and stop of soft initiator 2 through the closure of first A.C. contactor, 3 auxiliary contact a.Said soft initiator 2 is connected to bypass run signal output loop, soft initiator fault-signal output loop and soft initiator run signal output loop; The loop A 1-A2 of the 3rd relay 9 was charged when said bypass moved; The output run signal, the loop A 1-A2 of the 9th relay 10 is charged during said soft initiator 2 faults, the output fault-signal; The loop A 1-A2 of the tenth relay 11 was charged when said soft initiator moved, the output run signal;
The cold soft starting device of said high voltage direct current transmission valve also comprises electric current and voltage display unit 12, and display unit 12 1 ends are connected with electrical source of power through the 3rd breaker of plastic casing 13, and the display unit other end connects in circulating pump 7.
As shown in Figure 2; Said control loop comprises soft start circuit controls circuit and Bypass Control circuit; Soft start circuit controls circuit and Bypass Control circuit parallel connection access control power supply; Said soft start circuit controls circuit comprises the contact c of first breaker of plastic casing, 1 first auxiliary contact b, first relay 14, the contact d of second relay 15 and the loop A 1-A2 of first A.C. contactor 3; Said first breaker of plastic casing, 1 first auxiliary contact b, the contact c of first relay 14 and the loop A 1-A2 of first A.C. contactor 3 connect successively; The contact d of second relay 15 is parallelly connected with the contact c of first relay 14; Said Bypass Control circuit comprises the contact f of second breaker of plastic casing, 4 first auxiliary contact e, the 3rd relay 9, the contact g of the 4th relay 16, the contact h of the 5th relay 17 and the loop A 1-A2 of second A.C. contactor 5; Said second breaker of plastic casing, 4 first auxiliary contact e, the contact f of the 3rd relay 9 and the loop A 1-A2 of second A.C. contactor 5 connect successively; The contact h of the contact g of the 4th relay 16 and the 5th relay 17 is parallelly connected with the contact f of the 3rd relay 9 respectively, and the contact h of the contact d of the contact c of said first relay 14, second relay 15, the contact g of the 4th relay 16 and the 5th relay 17 is the PLC control point;
Said control loop also comprises first circuit breaker deciliter control circuit; Said first circuit breaker deciliter control circuit comprises first breaker of plastic casing, the 1 second auxiliary contact m of connection successively and the loop A 1-A2 of the 6th relay 18, and the said soft circuit controls circuit that breaks is parallelly connected with soft start circuit controls circuit and Bypass Control circuit;
Said control loop also comprises pump operating cycle indication circuit; Said pump operating cycle indication circuit comprises first A.C. contactor, 3 auxiliary contact i; Second A.C. contactor, 5 auxiliary contact j; The loop A 1-A2 of indicator light and the 7th relay 19, said second A.C. contactor, 5 auxiliary contact j connect with indicator light, and first A.C. contactor, 3 auxiliary contact i are parallelly connected with second A.C. contactor, 5 auxiliary contact j; The loop A 1-A2 of the 7th relay 19 is parallelly connected with indicator light, and said pump operating cycle indication circuit is parallelly connected with soft start circuit controls circuit and Bypass Control circuit;
Said control loop also comprises the circulating pump faulty line; Said circulating pump faulty line comprises the loop A 1-A2 and thermal relay 5 auxiliary contact 1 of second breaker of plastic casing, 4 second auxiliary contact k, the 8th relay 20; Said second breaker of plastic casing, 4 second auxiliary contact k connect with the loop A 1-A2 of the 8th relay 20 with thermal relay 5 auxiliary contact 1 parallel connection back, and said circulating pump faulty line is parallelly connected with soft start circuit controls circuit and Bypass Control circuit.
The foregoing description is a preferred implementation of the present invention; But execution mode of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.