阅读说明：本技术 一种防越级跳闸控制系统 (Override trip prevention control system ) 是由 骆弟华 吕玉奇 于 2018-09-10 设计创作，主要内容包括：本发明涉及电路保护领域,具体涉及一种电路保护装置。一种防越级跳闸控制系统,包括一级供电电路、一级控制电路、二级控制电路,一级控制电路包括依次连接的一级电流互感器、一级AD转换器、一级控制单元、一级继电器,一级继电器连接一级开关的控制端。通过多级开关控制,可以有效缓解各级开关之间相互影响的问题,采用延时电路可以有效控制各电路的开关跳闸时间,避免由于个别电路问题导致大面积停电情况的发生,通过缓解越级跳闸情况,有力保障井下供电系统的安全运行,及时筛选问题电路,利于故障排查。(The invention relates to the field of circuit protection, in particular to a circuit protection device. The utility model provides a prevent tripping operation control system that surpasses grade, includes one-level supply circuit, one-level control circuit, second grade control circuit, and one-level control circuit is including the one-level current transformer, one-level AD converter, one-level control unit, the one-level relay that connect gradually, and the control end of one-level switch is connected to the one-level relay. Through multistage on-off control, the problem of mutual influence between switches at different levels can be effectively alleviated, the time delay circuit can be adopted to effectively control the on-off tripping time of each circuit, the occurrence of large-area power failure caused by individual circuit problems is avoided, the override tripping condition is alleviated, the safe operation of the underground power supply system is powerfully guaranteed, the problem circuits are screened in time, and the troubleshooting is facilitated.)

1. The override trip prevention control system comprises a primary power supply circuit, wherein the primary power supply circuit comprises a power module, a primary switch and primary electric equipment which are sequentially connected;

the power supply circuit also comprises a primary control circuit, wherein the primary control circuit comprises a primary current transformer, a primary AD converter, a primary control unit and a primary relay which are sequentially connected, the primary relay is connected with the control end of the primary switch, and the primary current transformer is arranged on the primary power supply circuit and used for detecting the total current of the primary power supply circuit;

still include second grade control circuit, second grade control circuit is including the second grade current transformer, second grade AD converter, second grade control unit, the second grade relay that connect gradually, the second grade relay is connected the control end of second grade switch, second grade current transformer sets up on the second grade supply circuit, be used for the detection second grade supply circuit's electric current, second grade control unit still connects the one-level control unit.

2. The override trip prevention control system according to claim 1, wherein the secondary consumer comprises at least two tertiary power supply circuits, the tertiary power supply circuit comprises a tertiary switch and a tertiary consumer which are connected in sequence, and each group of at least two tertiary power supply circuits are connected in parallel;

still include tertiary control circuit, tertiary control circuit is including the tertiary current transformer, tertiary AD converter, tertiary the control unit, the tertiary relay that connect gradually, tertiary relay is connected the control end of tertiary switch, tertiary current transformer ware sets up tertiary power supply circuit is last, is used for detecting tertiary power supply circuit's electric current, tertiary the control unit still connects secondary control unit.

3. The override trip prevention control system according to claim 2, wherein the tertiary power consumer comprises at least two quaternary power supply circuits, the quaternary power supply circuit comprises a quaternary switch and a quaternary power consumer which are connected in sequence, and each group of at least two of the quaternary power supply circuits are connected in parallel;

still include level four control circuit, level four control circuit is including the level four current transformer, level four AD converter, the level four relay that connect gradually, the level four relay is connected the control end of level four switch, level four current transformer sets up on the level four supply circuit, be used for the detection level four supply circuit's electric current, level four AD converter still connects tertiary the control unit.

4. The override trip control system of claim 2 further comprising at least three sets of delay circuits; the primary control unit, the secondary control unit and the tertiary control unit are all connected with a group of delay circuits.

5. The override trip prevention control system according to claim 4, wherein when the primary power supply circuit, the secondary power supply circuit, the tertiary power supply circuit or the quaternary power supply circuit is short-circuited, the delay circuit controls the delay time by using a calculation mode of Ts = (n-m) xT + Td;

wherein, Ts is the delay time, T is the waiting delay of the current stage, Td is the short circuit measurement + communication completion time of the current stage, m is the current stage of the delay circuit, and n is the total stage number of the control system.

6. The override trip prevention control system according to claim 3 wherein the primary current transformer, the secondary current transformer, the tertiary current transformer, and the quaternary current transformer are each selected from a Ross transformer or an iron core current transformer.

7. A method of implementing an override trip prevention control system as recited in any one of claims 1 to 6, comprising the steps of:

1) the three-level control unit analyzes the current data of the four-level power supply circuit and the current data of the three-level power supply circuit:

when the four-stage power supply circuit is short-circuited, the three-stage control unit carries out time-delay judgment, and if the current of the three-stage power supply circuit is overlarge, the three-stage control unit sends an instruction to disconnect a three-stage switch; if the current of the three-stage power supply circuit is normal, the three-stage control unit does not send a disconnection instruction;

2) the secondary control unit analyzes current data of the tertiary power supply circuit and current data of the secondary power supply circuit:

when the three-stage power supply circuit is short-circuited, the secondary control unit carries out time delay judgment, and if the current of the secondary power supply circuit is too large, the secondary control unit sends an instruction to disconnect a secondary switch; if the current of the secondary power supply circuit is normal, the secondary control unit does not send a disconnection instruction;

3) the primary control unit analyzes the current data of the secondary power supply circuit and the current data of the primary power supply circuit:

when the secondary power supply circuit is short-circuited, the primary control unit carries out time-delay judgment, and if the current of the primary power supply circuit is too large, the primary control unit sends an instruction to disconnect a primary switch; and if the current of the primary power supply circuit is normal, the primary control unit does not send a disconnection instruction.

Technical Field

The invention relates to the field of circuit protection, in particular to a circuit protection device.

Background

At present, each substation of a coal mine underground power supply system in China mostly adopts a vertical power supply mode, so that the probability of large-area power failure of each stage of power system is very high, the condition of tripping of the coal mine underground power supply system is very large due to the fact that a circuit protection means is not available, and meanwhile, the faults cannot be accurately judged through a complex connection mode among the substations, so that great influence is caused to production and manufacturing.

In recent years, more and more circuit protection methods are continuously applied to various industries, so that the normal operation of power equipment is effectively guaranteed, the effect is remarkable, and the resource safety of companies is guaranteed.

Disclosure of Invention

The invention aims to provide an override trip prevention control system which effectively solves the problem that override trip frequently occurs underground a coal mine.

The technical problem solved by the invention can be realized by adopting the following technical scheme:

the override trip prevention control system comprises a primary power supply circuit, wherein the primary power supply circuit comprises a power module, a primary switch and primary electric equipment which are sequentially connected, the primary electric equipment comprises at least two secondary power supply circuits, the secondary power supply circuit comprises a secondary switch and secondary electric equipment, and the at least two secondary power supply circuits are connected in parallel;

the power supply circuit also comprises a primary control circuit, wherein the primary control circuit comprises a primary current transformer, a primary AD converter, a primary control unit and a primary relay which are sequentially connected, the primary relay is connected with the control end of the primary switch, and the primary current transformer is arranged on the primary power supply circuit and used for detecting the total current of the primary power supply circuit;

still include second grade control circuit, second grade control circuit is including the second grade current transformer, second grade AD converter, second grade control unit, the second grade relay that connect gradually, the second grade relay is connected the control end of second grade switch, second grade current transformer sets up on the second grade supply circuit, be used for the detection second grade supply circuit's electric current, second grade control unit still connects the one-level control unit.

The primary power supply circuit controls the secondary power supply circuit, when the primary switch is closed, the secondary power supply circuit supplies power normally, and when the primary switch is opened, the secondary power supply circuit is disconnected to supply power;

the secondary current transformer collects current data of the secondary power supply circuit and transmits the current data to the secondary AD converter, and the secondary AD converter converts the data and transmits the data to the secondary control unit; when the secondary power supply circuit is short-circuited, the secondary control unit sends a switch disconnection instruction to the secondary relay and feeds a signal back to the primary control unit; and the secondary relay disconnects the secondary switch according to the instruction.

The primary current transformer collects current data of the primary power supply circuit and transmits the current data to the primary AD converter, and the primary AD converter converts the data and transmits the data to the primary control unit; when the primary power supply circuit is short-circuited, the primary control unit sends a switch disconnection instruction to the primary relay, and the primary relay disconnects the primary switch according to the instruction; the primary control unit also analyzes current data of the secondary power supply circuit, when the secondary power supply circuit is short-circuited, the primary control unit delays for judgment, if the current of the primary power supply circuit is overlarge, the primary control unit sends an instruction to disconnect the primary switch, and if the current of the primary power supply circuit is normal, the primary control unit does not send a disconnection instruction.

According to the invention, through signal feedback among the multi-stage switches, normal power supply of the power supply circuit at the stage can be controlled, the power supply conditions of other power supply circuits can be effectively adjusted, the problem of mutual influence between a line main brake and a line separating brake can be effectively relieved, and a good protection effect on the whole line can be achieved.

The secondary power utilization equipment comprises at least two tertiary power supply circuits, each tertiary power supply circuit comprises a tertiary switch and a tertiary power utilization equipment which are sequentially connected, and at least two tertiary power supply circuits in each group are connected in parallel;

still include tertiary control circuit, tertiary control circuit is including the tertiary current transformer, tertiary AD converter, tertiary the control unit, the tertiary relay that connect gradually, tertiary relay is connected the control end of tertiary switch, tertiary current transformer sets up on the tertiary power supply circuit, be used for detecting tertiary power supply circuit's electric current, tertiary the control unit still connects the secondary control unit.

The three-level current transformer collects current data of the three-level power supply circuit and transmits the current data to the three-level AD converter, and the three-level AD converter converts the data and transmits the data to the three-level control unit; when the three-level power supply circuit is short-circuited, the three-level control unit sends a switch disconnection instruction to the three-level relay, and the three-level relay disconnects the three-level switch according to the instruction; the secondary control unit also analyzes current data of a tertiary power supply circuit, when the tertiary power supply circuit is short-circuited, the secondary control unit carries out time delay judgment, and if the current of the secondary power supply circuit is overlarge, the secondary control unit sends an instruction to disconnect the secondary switch; and if the current of the secondary power supply circuit is normal, the secondary control unit does not send a disconnection instruction.

The three-level electric equipment comprises at least two four-level power supply circuits, each four-level power supply circuit comprises a four-level switch and four-level electric equipment which are sequentially connected, and at least two four-level power supply circuits in each group are connected in parallel;

still include level four control circuit, level four control circuit is including the level four current transformer, level four AD converter, the level four relay that connect gradually, the level four relay is connected the control end of level four switch, level four current transformer sets up on the level four supply circuit, be used for the detection level four supply circuit's electric current, level four AD converter still connects tertiary the control unit.

The four-level current transformer collects current data of a four-level power supply circuit and transmits the current data to the four-level AD converter, the four-level AD converter converts the data and transmits the data to the four-level relay, and meanwhile, signals are transmitted to the four-level control unit; when the four-stage power supply circuit is short-circuited, the four-stage relay closes the four-stage switch; the three-level control unit also analyzes data of the four-level power supply circuit, when the four-level power supply circuit is short-circuited, the three-level control unit carries out time-delay judgment, and if the current of the three-level power supply circuit is overlarge, the three-level control unit sends an instruction to disconnect a three-level switch; and if the current of the three-stage power supply circuit is normal, the three-stage control unit does not send a disconnection instruction.

The first-stage current transformer, the second-stage current transformer, the third-stage current transformer and the fourth-stage current transformer are all selected from Ross transformers or iron core current transformers.

The invention selects the Ross mutual inductor, so that the current mutual inductors with different transformation ratios do not need to be replaced for different rated current grades, the full-load distribution device can be arranged at any time when the current changes, and the condition of overhigh voltage can not occur.

The circuit also comprises at least three groups of delay circuits; the primary control unit, the secondary control unit and the tertiary control unit are all connected with a group of delay circuits.

When the first-stage power supply circuit, the second-stage power supply circuit, the third-stage power supply circuit or the fourth-stage power supply circuit is short-circuited, the delay circuit controls the delay time in the following calculation mode:

Ts=(n-m)×T+Td

wherein, Ts is the delay time, T is the waiting delay of the current stage, Td is the short circuit measurement + communication completion time of the current stage, m is the current stage of the delay circuit, and n is the total stage number of the control system.

The invention is additionally provided with the time delay circuit, and the time delay means is adopted, so that the switch tripping time of each circuit can be effectively controlled, and the large-area power failure condition caused by the problem of individual circuits is avoided; the safe operation of the underground power supply system is powerfully guaranteed by relieving the override trip condition; through the management and control of the three-level distribution box and the application of delayed tripping, a problem circuit can be screened out in time, and circuit faults are checked.

Has the advantages that: due to the adoption of the technical scheme, the invention has the following advantages:

1) according to the invention, through signal feedback among the multi-stage switches, the state of the stage switch can be controlled, signals can be fed back to the upper control unit in time, the state of the whole line can be effectively adjusted, the problem of mutual influence between the main brake and the separating brake of the line can be effectively relieved, and the whole line can be well protected.

2) The invention is additionally provided with the delay circuit, adopts a delay means, can effectively control the switch trip time of each circuit, and avoids the occurrence of large-area power failure caused by individual circuit problems; the safe operation of the underground power supply system is powerfully guaranteed by relieving the override trip condition.

3) Through the control of level four switch and the application of delay circuit, can in time select the problem circuit, be favorable to the investigation of circuit trouble.

Drawings

FIG. 1 is a schematic diagram of the overall architecture of an implementation of the present invention;

FIG. 2 is a schematic view of a specific connection of the present invention;

FIG. 3 is a schematic diagram of the connection of the delay circuit according to the present invention;

FIG. 4 is a schematic diagram of the switch connection controlled by the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.

Referring to fig. 1 to 4, an override trip prevention control system comprises a primary power supply circuit 1, wherein the primary power supply circuit 1 comprises a power module, a primary switch and primary electric equipment which are sequentially connected, the primary electric equipment comprises at least two secondary power supply circuits 2, the secondary power supply circuits 2 comprise secondary switches and secondary electric equipment, and the at least two secondary power supply circuits 2 are connected in parallel;

the device also comprises a primary control circuit, wherein the primary control circuit comprises a primary current transformer 6, a primary AD converter 7, a primary control unit 8 and a primary relay 9 which are sequentially connected, the primary relay 9 is connected with the control end of a primary switch 10, and the primary current transformer 6 is arranged on the primary power supply circuit 1 and used for detecting the total current of the primary power supply circuit 1;

still include second grade control circuit, second grade control circuit is including the second grade current transformer 11, second grade AD converter 12, second grade control unit 13, the second grade relay 14 that connect gradually, and second grade relay 14 connects the control end of second grade switch 15, and second grade current transformer 11 sets up on second grade power supply circuit 2 for detect second grade power supply circuit 2's electric current, and second grade control unit 13 still connects one-level control unit 8.

Referring to fig. 1 to 2, a primary power supply circuit 1 controls a secondary power supply circuit 2, when a primary switch 10 is closed, the secondary power supply circuit 2 supplies power normally, and when the primary switch 10 is opened, the secondary power supply circuit 2 cuts off power supply;

the secondary current transformer 11 collects current data of the secondary power supply circuit 2 and transmits the current data to the secondary AD converter 12, and the secondary AD converter 12 converts the data and transmits the data to the secondary control unit 13; when the secondary power supply circuit 2 is short-circuited, the secondary control unit 13 sends a switch disconnection instruction to the secondary relay 14 and feeds back a signal to the primary control unit 8; the secondary relay 14 turns off the secondary switch 15 according to the instruction.

The primary current transformer 6 collects current data of the primary power supply circuit 1 and transmits the current data to the primary AD converter 7, and the primary AD converter 7 converts the data and transmits the data to the primary control unit 8; when the primary power supply circuit 1 is short-circuited, the primary control unit 8 sends a switch disconnection instruction to the primary relay 9, and the primary relay 9 disconnects the primary switch 10 according to the instruction; the primary control unit 8 also analyzes the current data of the secondary power supply circuit 2, when the secondary power supply circuit 2 is short-circuited, the primary control unit 8 carries out time-delay judgment, if the current of the primary power supply circuit 1 is overlarge, the primary control unit 8 sends an instruction to disconnect the primary switch 10, and if the current of the primary power supply circuit 1 is normal, the primary control unit 8 does not send a disconnection instruction.

Referring to fig. 1 to 2, the secondary power consumption device includes at least two tertiary power supply circuits 3, the tertiary power supply circuit 3 includes a tertiary switch 20 and a tertiary power consumption device which are connected in sequence, and each group of at least two tertiary power supply circuits 3 are connected in parallel;

the three-level power supply circuit further comprises a three-level control circuit, the three-level control circuit comprises a three-level current transformer 16, a three-level AD converter 17, a three-level control unit 18 and a three-level relay 19 which are sequentially connected, the three-level relay 19 is connected with a control end of a three-level switch 20, the three-level current transformer 16 is arranged on the three-level power supply circuit 3 and used for detecting the current of the three-level power supply circuit 3, and the three-level control unit 18 is further connected with a two-level control.

The three-level current transformer 16 collects current data of the three-level power supply circuit 3 and transmits the current data to the three-level AD converter 17, and the three-level AD converter 17 converts the data and transmits the data to the three-level control unit 18; when the three-level power supply circuit 3 is short-circuited, the three-level control unit 18 sends a switch disconnection instruction to the three-level relay 19, and the three-level relay 19 disconnects the three-level switch 20 according to the instruction; the secondary control unit 13 also analyzes the current data of the tertiary power supply circuit 3, when the tertiary power supply circuit 3 is short-circuited, the secondary control unit 13 delays for judgment, and if the current of the secondary power supply circuit 2 is too large, the secondary control unit 14 sends an instruction to disconnect the secondary switch 15; if the current of the secondary power supply circuit 2 is normal, the secondary control unit 13 does not issue a turn-off command.

Referring to fig. 1 to 4, the three-level power consumption device includes at least two four-level power supply circuits 4, each four-level power supply circuit 4 includes a four-level switch 24 and a four-level power consumption device 5, which are connected in sequence, and each group of at least two four-level power supply circuits 4 are connected in parallel;

still include level four control circuit, level four control circuit is including the level four current transformer 21, level four AD converter 22, the level four relay 23 that connect gradually, and level four relay 23 connects level four switch 24's control end, and level four current transformer 21 sets up on level four power supply circuit 4, is used for detecting level four power supply circuit 4's electric current, level four AD converter 22 still connect tertiary the control unit 18.

The four-stage current transformer 21 collects current data of the four-stage power supply circuit 4 and transmits the current data to the four-stage AD converter 22, the four-stage AD converter 22 converts the data and transmits the data to the four-stage relay 23, and meanwhile, signals are transmitted to the three-stage control unit 18; when the four-stage power supply circuit 4 is short-circuited, the four-stage relay 23 closes the four-stage switch 24; the third-level control unit 18 also analyzes the current data of the fourth-level power supply circuit 4, when the fourth-level power supply circuit 4 is short-circuited, the third-level control unit 18 carries out time-delay judgment, and if the current of the third-level power supply circuit 3 is too large, the third-level control unit 18 sends an instruction to disconnect the third-level switch 20; if the current of the three-stage power supply circuit 3 is normal, the three-stage control unit 18 does not issue the turn-off instruction.

Referring to fig. 2, the first-stage current transformer 6, the second-stage current transformer 11, the third-stage current transformer 16, and the fourth-stage current transformer 21 are all ross transformers or iron core current transformers.

Referring to fig. 2 to 3, at least three sets of delay circuits 25 are further included; the primary control unit 8, the secondary control unit 13 and the tertiary control unit 18 are all connected with a group of delay circuits 25.