CN209994103U - Hybrid switch with soft start and protection functions for DC power distribution system - Google Patents
Hybrid switch with soft start and protection functions for DC power distribution system Download PDFInfo
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- CN209994103U CN209994103U CN201920178030.XU CN201920178030U CN209994103U CN 209994103 U CN209994103 U CN 209994103U CN 201920178030 U CN201920178030 U CN 201920178030U CN 209994103 U CN209994103 U CN 209994103U
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Abstract
The utility model discloses a hybrid switch that is used for direct current distribution system to contain soft start and protect function, including consecutive protection circuit (100), main switch circuit (200), soft start circuit (300) parallelly connected with main switch circuit (200), current acquisition circuit (400) and be used for the control and save protection circuit (100), main switch circuit (200), soft start circuit (300), intelligent control circuit (500) of the operating condition information of current acquisition circuit (400), wherein main switch circuit (200) include the main switch, the main switch is direct current circuit breaker (D1), soft start circuit (300) include soft start switch and soft start resistance, wherein soft start switch (Qs) are semiconductor switch. The utility model provides a hybrid switch can improve direct current distribution system's reliability by a wide margin, the fault rate of lowering system, the cost of lowering system.
Description
Technical Field
The utility model relates to a smart power grids field, concretely relates to a hybrid switch that contains soft start and protect function for direct current distribution system.
Background
With the popularization of the application of the direct current power supply system, the demand of the direct current distribution protection switch is increasingly large, and currently, mechanical switches such as a direct current circuit breaker and a direct current contactor are commonly used. However, in the practical application process, because the power supply side and the load side in the direct current system have larger capacitors, very large impact current can be caused due to the charging and discharging of the capacitors at the closing moment of the switch, which is different from the alternating current system, the peak value of the impact current often far exceeds the rated value of the switch element, so that the service life of the switch element is seriously influenced, and the failure rate is high; in addition, unlike the ac system, the dc system has no periodic zero crossing point, which makes it difficult to extinguish the arc when the switch is turned off, thus increasing the design complexity of the switch and making the switch more expensive than the ac switch.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a overcome the higher and expensive technical problem of mechanical type switch fault rate among the prior art simultaneously, and the problem that electronic type switch current capacity is lower relatively, get electronic switch and mechanical switch the two good, regard electronic switch as soft start switch, regard mechanical switch as main switch and protection switch, thereby a hybrid switch who contains soft start and protect function for direct current distribution system is provided, the controllable switch function of contactor has been combined, the overcurrent protection function of circuit breaker, and soft start function has been increased, and control and communication function etc., direct current distribution system's reliability can be improved by a wide margin, reduce system's fault rate, reduce system's cost.
The utility model provides a hybrid switch that is used for direct current distribution system to contain soft start and protect function, include:
a protection circuit: one end of the soft start circuit is connected with the output end of the direct current power supply, and the other end of the soft start circuit is connected with the main switch circuit and the soft start circuit and used for cutting off a fault branch circuit when the load is over-current or short-circuit and the main switch circuit fails;
a main switching circuit: the two ends of the soft start circuit are respectively connected with the protection circuit and the current acquisition circuit and are connected with the soft start circuit in parallel, and the soft start circuit is used for switching on or switching off a direct current load branch circuit and protecting overcurrent or short circuit of a load; the main switch circuit comprises a main switch, and the main switch is a mechanical switch;
the soft start circuit: the two ends of the main switch circuit are respectively connected with the protection circuit and the current acquisition circuit and are connected with the main switch circuit in parallel, the main switch circuit is used for switching on before switching on the circuit to limit the impact current, and the main switch circuit is used for switching off after switching on and preparing for next soft start; the soft start circuit comprises a soft start switch and a soft start resistor which are arranged in series, and the soft start switch is a semiconductor switch;
the current acquisition circuit: one end of the main switch circuit is connected with the soft start circuit, and the other end of the main switch circuit is connected with the input end of the direct current load, and the main switch circuit and the soft start circuit are used for sampling the current of the direct current load and transmitting the sampling result to the intelligent control circuit;
the intelligent control circuit: the sampling result is used for monitoring and storing the working state information of the protection circuit, the main switch circuit, the soft start circuit and the current acquisition circuit, so that more monitoring functions than a contactor and a circuit breaker are realized.
Electronic switch receive outside instruction through intelligent control circuit, carry out on-off control, this function is similar to the contactor. The contactor is different from the contactor in that when the contactor is switched on, because capacitors in circuits at two ends of the contactor are at different voltage levels, a large impact current is generated at the moment of switching on the contactor; and the utility model discloses in when normally opening, carry out soft start earlier, switch on soft starting switch earlier before the main switch-on promptly, soft starting resistance who establishes ties with soft starting switch this moment can be in safe range with starting current restriction, soft start finishes after one section time delay, and the main switch both ends are in same electric potential promptly, opens the main switch again at this moment, just can avoid impulse current's production, has avoided components and parts to overflow and the risk of excessive pressure in the system, has improved its reliability and life. After the main switch is completely switched on, the soft start switch is switched off, so that preparation for next soft start is made.
When great fault current appears, electron and mechanical hybrid switch can realize protect function through inside circuit breaker. The current breaking capacity of the circuit breaker is far greater than that of the contactor, so that the circuit breaker is used for protecting when a fault occurs, the contactor is not used for breaking fault current, and the service life of the contactor is guaranteed. And sampling the direct current load through a current acquisition device. When the current is small, the current collecting device can be a sampling resistor; when the current is large, the current collecting device can be a Hall sensor. The collected current is uploaded to an external system through an intelligent control circuit for further analysis and processing.
A hybrid switch that is used for DC distribution system to contain soft start and protect function, as preferred mode, the main switch is direct current contactor.
A hybrid switch that is used for DC distribution system to contain soft start and protect function, as preferred mode, protection circuit is direct current breaker.
A hybrid switch that is used for DC distribution system to contain soft start and protect function, as preferred mode, intelligent control circuit carries out information exchange through communication interface and system outside.
In the use process of the utility model, when the direct current distribution system is normally switched on, the soft start switch is firstly switched on, the soft start current is limited by the soft start resistor connected with the soft start switch in series, after a period of time delay, the soft start process is finished, the main switch is switched on again, no impact current is generated when the main switch is switched on, the maximum current flowing through the main switch is the maximum load current, and the soft start switch is switched off after the main switch is switched on to prepare the next soft start period; when the direct current power distribution system is normally turned off, the main switch is directly turned off; when fault current occurs, the main switch keeps an opening state, and the fault current is cut off through the breaker to protect the circuit. The reason for adopting the circuit breaker to protect is that the fault circuit breaking capacity of the circuit breaker is far greater than that of the direct current contactor, so that the contactor is well protected, the reliability can be improved, and the service life of the contactor is prolonged.
The utility model discloses use semiconductor device to replace mechanical switch as soft start switch, because soft start switch's maximum current is restricted by soft start resistance, too big electric current can not appear, and only can the through current at the switch transient, most of time is in non-operating condition. The semiconductor device adopted in the state has higher reliability and longer service life than a mechanical switch, and the cost can be greatly reduced.
Drawings
Fig. 1 is an electronic switch with soft start and protection functions for a dc power distribution system.
FIG. 2 is a schematic view of example 1.
Reference numerals:
100. a protection circuit; 200. a main switching circuit; 300. a soft start circuit; 400. a current collection circuit; 500. An intelligent control circuit; rs: a soft start resistor; and Qs: a soft start switch; j1: a DC contactor; d1: a DC circuit breaker.
Detailed Description
As shown in fig. 1, an electronic for a dc power distribution system includes:
the protection circuit 100: one end of the soft start circuit is connected with the output end of the direct current power supply, and the other end of the soft start circuit is connected with the main switch circuit 200 and the soft start circuit 300 and used for cutting off a fault branch circuit when the load is over-current or short-circuited and the main switch circuit 200 has a fault; the protection circuit 100 is a direct current breaker D1;
main switching circuit 200: two ends of the soft start circuit 300 are respectively connected with the protection circuit 100 and the current collection circuit 400 and are connected in parallel with the soft start circuit for connecting or disconnecting the direct current load branch; the main switch circuit 200 includes a main switch, which is a dc contactor J1;
the soft-start circuit 300: two ends of the main switch circuit 200 are respectively connected with the protection circuit 100 and the current collecting circuit 400 and are connected with the main switch circuit 200 in parallel, so that the main switch circuit 200 is firstly switched on before being switched on to limit the impact current, and the main switch circuit 200 is switched off after being switched on to prepare for next soft start; the soft start circuit 300 comprises a soft start switch Qs and a soft start resistor Rs which are arranged in series, wherein the soft start switch Qs is a semiconductor switch;
the current collection circuit 400: one end of the main switch circuit 200 is connected with the soft start circuit 300, and the other end of the main switch circuit is connected with the input end of the direct current load, so that the direct current load can sample the current and transmit the sampling result to the intelligent control circuit 500;
the intelligent control circuit 500: the soft start circuit 300 is used for performing switching control on the main switch circuit 200 and the soft start circuit 300 according to an external instruction, receiving a sampling result transmitted by the current acquisition circuit 400, and monitoring and storing working state information of the protection circuit 100, the main switch circuit 200, the soft start circuit 300 and the current acquisition circuit 400; the intelligent control circuit 500 performs information transmission with an external system through a communication interface.
Example 1
When the current is larger than the safe current of the semiconductor device, as shown in fig. 2, the rated voltage of the direct current system is 800V, the load rated power is 60kW, and the load capacitance is 15000 uF; the load is formally started two seconds after the direct current power supply.
The rated current is 75A, the soft start resistance Rs is 7 omega, and the peak impact current is 800V/7 omega is 114A. The startup time constant is 7 Ω × 15000uF ═ 0.105sec, and the startup delay time may be set to 1 second. The power rating of the soft start resistor Rs may be selected to be 5 kW. The main switch can be selected as a 1000V DC contactor J1 with rated current 150A; the soft start switch can be selected as a silicon carbide MOS tube of 1200V, and the on-resistance is 10m omega; the circuit breaker can select rated voltage 1kV and rated current 150A.
In the use process of the embodiment, when a direct current distribution system is normally switched on, the first semiconductor switch Qs is switched on firstly, the soft start current is limited by the soft start resistor Rs, after a period of time delay, the soft start process is finished, then the direct current contactor J1 is switched on, no impact current is generated when the direct current contactor J1 is switched on, the maximum current flowing through the direct current contactor J1 is the maximum load current, and after the direct current contactor J1 is switched on, the first semiconductor switch Qs is switched off to prepare for the next soft start period; when the direct current distribution system is normally turned off, the direct current contactor J1 is directly turned off; after the intelligent controller 400 judges that the direct current breaker D1 trips through detecting the rear end voltage Vf of the breaker, the direct current contactor J1 is automatically switched off immediately so as to avoid uncontrollable impact current brought after the direct current breaker D1 is reset manually, and after the direct current breaker D1 is reset, because the direct current contactor J1 and the first semiconductor switch Qs are both in a switching-off state, no current can be generated, and then the switching-on of the switch is completed through normal switching operation.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that various modifications, changes, and equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A hybrid switch for use in a dc power distribution system having soft start and protection functions, comprising: the method comprises the following steps:
protection circuit (100): one end of the soft start circuit is connected with the output end of the direct current power supply, and the other end of the soft start circuit is connected with the main switch circuit (200) and the soft start circuit (300) and used for cutting off a fault branch circuit when a load is in overcurrent or short circuit and the main switch circuit (200) fails;
main switching circuit (200): two ends of the soft start circuit are respectively connected with the protection circuit (100) and the current acquisition circuit (400) and are connected with the soft start circuit (300) in parallel, and the soft start circuit is used for switching on or switching off a direct current load branch and protecting overcurrent or short circuit of a load; the main switch circuit (200) comprises a main switch, which is a mechanical switch;
soft start circuit (300): two ends of the main switch circuit are respectively connected with the protection circuit (100) and the current acquisition circuit (400) and are connected with the main switch circuit (200) in parallel, the main switch circuit (200) is used for switching on before switching on the circuit to limit the impact current, and the main switch circuit (200) is switched on and then is switched off to prepare for next soft start; the soft start circuit (300) comprises a soft start switch (Qs) and a soft start resistor (Rs) which are arranged in series, wherein the soft start switch (Qs) is a semiconductor switch;
current acquisition circuit (400): one end of the soft start circuit is connected with the main switch circuit (200) and the soft start circuit (300), and the other end of the soft start circuit is connected with the input end of the direct current load, and the soft start circuit is used for sampling the current of the direct current load and transmitting the sampling result to the intelligent control circuit (500);
intelligent control circuit (500): the circuit is used for performing switching control on the main switch circuit (200) and the soft start circuit (300) according to an external instruction, receiving the sampling result transmitted by the current acquisition circuit (400), and monitoring and saving working state information of the protection circuit (100), the main switch circuit (200), the soft start circuit (300) and the current acquisition circuit (400).
2. The hybrid switch with soft start and protection functions for a dc power distribution system of claim 1, wherein: the main switch is a direct current contactor (J1).
3. The hybrid switch with soft start and protection functions for a dc power distribution system of claim 2, wherein: the protection circuit (100) is a direct current breaker (D1).
4. A hybrid switch with soft start and protection for a dc power distribution system as claimed in any one of claims 1 to 3 wherein: the intelligent control circuit (500) exchanges information with the outside of the system through a communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920178030.XU CN209994103U (en) | 2019-02-01 | 2019-02-01 | Hybrid switch with soft start and protection functions for DC power distribution system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920178030.XU CN209994103U (en) | 2019-02-01 | 2019-02-01 | Hybrid switch with soft start and protection functions for DC power distribution system |
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| CN209994103U true CN209994103U (en) | 2020-01-24 |
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| CN201920178030.XU Active CN209994103U (en) | 2019-02-01 | 2019-02-01 | Hybrid switch with soft start and protection functions for DC power distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861194A (en) * | 2019-02-01 | 2019-06-07 | 上海泓语电气技术有限公司 | The composite switch containing soft start and defencive function for direct-flow distribution system |
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2019
- 2019-02-01 CN CN201920178030.XU patent/CN209994103U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861194A (en) * | 2019-02-01 | 2019-06-07 | 上海泓语电气技术有限公司 | The composite switch containing soft start and defencive function for direct-flow distribution system |
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Effective date of registration: 20230330 Address after: 518063 383, Phase I, Huiheng Building, 138 Gaoxin South 7th Road, High-tech Zone Community, Yuehai Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Lvdian DC Electrical Technology Co.,Ltd. Address before: Room 1410, Building 3, No. 2388, Xiupu Road, Pudong New Area, Shanghai, 201315 Patentee before: SHANGHAI HONYO ELECTRIC Co.,Ltd. |