CN213367390U - Intelligent DC protection controller - Google Patents

Abstract

The utility model provides an intelligent DC protection controller belongs to low-voltage apparatus accessory technical field, including main control unit, dropout drive unit, fault signal input unit and electrical unit, the sense terminal of fault signal input unit inserts and waits to detect electrical circuit, its output and be connected to main control unit's input, main control unit's output with the dropout drive unit is connected and is controlled the dropout drive unit action, electrical unit is used for the power supply. The utility model discloses can detect short-circuit fault's concrete type, drive trip coil action when realizing short-circuit short delay trouble and cut off the intelligent control of trip coil action when electric circuit, short circuit instantaneous fault, can use in multistage direct current system.

Description

Intelligent DC protection controller

Technical Field

The utility model relates to a low-voltage apparatus technical field especially relates to an intelligent direct current protection controller.

Background

The direct current low-voltage electrical apparatus is a kind of field extensive application such as power plant, transformer substation, photovoltaic, track traffic. The traditional direct current low-voltage electrical appliance product only has two-stage protection of overload and instantaneous protection. In a multi-stage direct current system, selective protection can be realized on the upper stage and the lower stage during application, so that when a short-circuit fault occurs, the nearest circuit breaker is guaranteed to trip, and power supply of other loops cannot be influenced. In addition, the short circuit caused by any fault is not displayed after the current direct-current low-voltage electrical appliance is tripped, so that maintenance personnel cannot immediately check the fault problem and reset the power-on loop.

Based on the problems in the practical application, the application of the scheme is provided.

Disclosure of Invention

The utility model provides a not enough to prior art, the utility model provides an intelligent direct current protection controller, it is used for using with the low-voltage circuit breaker cooperation, solves the problem that prior art direct current low-voltage apparatus is difficult to adapt to multistage direct current system and uses, extension direct current low-voltage apparatus's application range to further make it can show specific short circuit type, so that in-service use.

In order to achieve the above object, the utility model discloses intelligent direct current protection controller structure as follows: including main control unit, dropout drive unit, fault signal input unit and electrical unit, fault signal input unit's sense terminal with insert wait to examine in the circuit, its output is connected to main control unit's input, main control unit's output with the dropout drive unit is connected and is controlled the action of dropout drive unit, electrical unit is used for the power supply.

In the technical scheme, the fault signal input unit detects the short-circuit condition on the circuit to be detected and transmits the short-circuit condition to the main control unit, and the main control unit determines whether to control the tripping driving unit to execute tripping action to disconnect the circuit to be detected according to the short-circuit condition obtained by detection, so that the circuit to be detected can be applied to a multi-stage direct-current system, the upper and lower stages can realize selective protection, and the circuit to be detected is suitable for practical use.

The utility model discloses further set up as follows: and the short-circuit state display unit is connected with the output end of the main control unit and controls the short-circuit state displayed by the main control unit.

Through above-mentioned technical scheme, short-circuit state display element can be used to after the trouble takes place to the concrete type of short-circuit fault is shown to modes such as light, characters to maintenance personal is according to this information troubleshooting, the recovery power supply fast.

The utility model discloses further set up as follows: the short circuit state display unit comprises a short circuit instantaneous fault indicator lamp and a short circuit short delay fault indicator lamp, and the short circuit instantaneous fault indicator lamp and the short circuit short delay fault indicator lamp are different in light color. The effect of adopting above-mentioned structure is as follows: firstly, the cost is low, the wiring is simple, and the circuit is stable; and secondly, different short circuit states are distinguished through colors, so that the short circuit warning device is more striking and has a good warning effect.

The utility model discloses further set up as follows: the time setting unit is used for setting a time reference of the delay time length of the short circuit short delay fault and is electrically connected with the input end of the main control unit.

Because the duration time of the instantaneous short-circuit fault is within 10ms and is not adjustable, when the short circuit within 10ms occurs, the main control unit can judge the occurrence of the instantaneous short-circuit fault. The time of short circuit and short delay of the time setting unit, such as 10ms, 20ms and 30ms, set in the above technical scheme can be used for judging whether a short circuit delay fault occurs in the circuit. Furthermore, the main control unit can distinguish two different short-circuit fault types, namely short-circuit instantaneous fault and short-circuit short-delay fault according to short-circuit time.

The technical scheme can be suitable for different electric lines, and a user can conveniently adjust the time reference of short-circuit short delay according to the short-circuit short delay duration time of the actual electric line.

For convenient use, the utility model discloses further set up as follows: the time setting unit is a rotary coding switch.

The utility model discloses further set up as follows: the fault signal input unit comprises a microswitch, and a normally closed contact of the microswitch is connected to the input end of the main control unit. When short-circuit fault occurs, the micro switch outputs a short-circuit signal, the main control unit calculates the duration time of the signal and compares the duration time with a time reference, and the fault type is judged.

The utility model discloses further set up as follows: the reset circuit is connected to the input end of the main control unit, and the main control unit clears the short-circuit state display on the short-circuit state display unit after detecting a reset signal provided by the reset circuit.

The utility model discloses further set up as follows: the main control unit provides a pulse signal through the tripping driving unit to drive the tripping coil to act.

The utility model has the advantages as follows:

firstly, the utility model discloses can detect short-circuit fault's specific type, drive trip coil action when realizing short circuit short-delay fault and cut off the intelligent control of trip coil action when electric circuit, short circuit instantaneous fault, can the upper and lower level realize the selectivity protection-when requiring short-circuit fault to take place promptly, guarantee nearest circuit breaker tripping operation, and other return circuits normally supply power, and then adapt to and use in multistage DC system. The utility model discloses the theory of entirety is simple, be convenient for realize.

Two, the utility model discloses a further set up short circuit fault state display element, through the type that display element is directly perceived, the user short circuit trouble is reminded conspicuously to in the quick troubleshooting trouble.

Drawings

Fig. 1 is a schematic overall schematic diagram of an embodiment of the present invention.

Fig. 2 is a schematic view of a work flow of an embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of an embodiment of the present invention.

Fig. 4 is a schematic view of the overall principle of embodiment 2 of the present invention.

Detailed Description

The utility model provides an intelligent DC protection controller, its specific type that distinguishes short-circuit fault in the electric circuit through the delay time that the short circuit lasts, according to short-circuit fault's particular case, decides whether the trip coil action of controlling the product cuts off electric circuit, realizes distinguishing the selectivity protection of upper and lower level in multistage DC system.

The following description will be given with reference to specific examples.

Embodiment 1 this embodiment provides an intelligent dc protection controller, as shown in fig. 1, which includes a main control unit, a trip driving unit, a fault signal input unit, and a power supply unit. Referring to fig. 3, in the present embodiment, the main control unit is a control chip U1, which may be a one-chip microcomputer, the fault signal input unit includes a resistor R15, a capacitor C7, a connection terminal P3, and a connection terminal P4, one end of the resistor R13 is connected to a pin PA9 of the control chip U1, the other end of the resistor R9 is connected to one end of the capacitor C7, the other end of the capacitor C7 is grounded, the connection terminal P3 is grounded, and the connection point P4 is connected to a connection point of the resistor R13 and the capacitor C7. When the circuit breaker is applied, the connecting end P3 is grounded, and the connecting end P4 is respectively connected with two ends of any load in an electric circuit, or when the circuit breaker is applied, a microswitch linked with the circuit breaker body can be arranged, and the connecting end P3 is grounded, and the connecting end P4 is respectively connected with two ends of a normally closed contact in the microswitch.

Since the tripping of the product is performed by a mechanical structure (within 10ms) when the transient short-circuit fault occurs, the micro switch outputs a short-circuit signal, and the control chip U1 can judge the fault type according to the duration of the signal.

The tripping driving unit comprises a driving circuit consisting of a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25 and a triode Q3, and the input end of the driving circuit is connected to a pin PA10 of a control chip U1. The control chip U1 gives a pulse signal to the pin PA10, and the MOS transistor Q2 can be driven to be conducted through the driving circuit, so that the trip coil is driven to trip.

As shown in fig. 2, the working principle of the present embodiment is as follows: the detection end (or called input end) of the fault signal input unit is connected to an electric circuit to be detected, the output end of the fault signal input unit is connected to the input end of the main control unit, a detected short-circuit signal is transmitted to a control chip U1 (namely MCU) in the main control unit, the control chip U1 compares the duration time of the obtained short-circuit signal with a predetermined delay time (the comparison process refers to the working flow shown in FIG. 2), and the action of a tripping coil in the electric circuit to be detected is controlled through a tripping driving unit electrically connected with the output end of the tripping driving unit to cut off the electric circuit. The power supply unit supplies power to the units so that the units can work normally.

The predetermined delay time can be set by a system, namely the delay time is defined in an assignment mode at the beginning of program editing, and an external input mode of combining keys with a display screen can also be adopted, so that the cost and the application range are considered. In this embodiment, a rotary encoder switch is used, as shown in fig. 3, the delay time adjustable circuit is composed of a resistor R13, a resistor R14, a resistor R15, a resistor R16, and a dial switch S1, the resistor R13, the resistor R14, the resistor R15, and the resistor R16 are arranged in parallel, one end of the resistor R13, the resistor R14, the resistor R15, and the resistor R16 is connected to a high level, and the other end is connected to different contacts on the dial switch S1. By rotating the dial switch S1, the short delay time can be set as follows: 10ms/30ms/60 ms/OFF. The embodiment provides an external input type delay time setting function with a multi-gear adjusting function through the rotary coding switch, is simple to use, and also covers the practical use situations of different low-voltage electrical appliances at present.

Embodiment 2 this embodiment provides an intelligent dc protection controller, as shown in fig. 4, further including a short-circuit state display unit, where the short-circuit state display unit includes a short-circuit instantaneous fault indicator and a short-circuit short-delay fault indicator, and the short-circuit instantaneous fault indicator and the short-circuit short-delay fault indicator have different light colors. As shown in fig. 3, the output terminal of the main control unit is connected, and the main control unit controls the displayed short-circuit state.

The resistor R17 and the diode D5 are connected in series to form an instantaneous fault display circuit, the vacant end of the resistor R17 is connected to a pin PA1 of the control chip U1, the negative electrode of the diode D5 is grounded, and a red indicator lamp is turned on when an instantaneous fault occurs. The resistor R18 and the diode D6 are connected in series to form a short-circuit short-delay display circuit, the vacant end of the resistor R18 is connected to a pin PA4 of the control chip U1, the negative electrode of the diode D6 is grounded, and the yellow indicator lamp is turned on when a short-circuit short-delay fault occurs.

In the above embodiment, the product may be reset by a reset circuit for continuous use, the reset circuit is composed of a capacitor C5, a capacitor C6, a resistor R12 and a key S2, and after the product is cleared, the fault indicator lamp is turned off by pressing the key S2 to reset the product.

The working principle of one embodiment is as follows:

when the system normally operates, the control chip U1 reads the set fault delay time value of the rotary type coding switch and scans the short-circuit signal in real time to ensure accurate response and output of the fault signal.

When the circuit breaks down, the short-circuit signal switch is closed (the connecting end P3 is communicated with the connecting end P4), the control chip U1 is triggered to enter interruption, a timer in the control chip U1 is started to accurately time, the duration time of the signal is obtained, the duration time is compared with the set delay time, the fault type is judged (the instantaneous fault time is within 10ms, the short-circuit delay time is greater than 10ms), and meanwhile, a high level is output to light the corresponding fault indicator lamp. If the fault is a short-circuit short-delay fault, a pulse signal with a certain duty ratio is output through an output PA10 interface and a driving circuit to drive a trip coil to act and cut off an electric circuit. The reset button S2 can be used to reset the fault.

To sum up, the utility model provides a can distinguish the short circuit trouble according to the time that short circuit signal lasts for short circuit instantaneous failure or for short circuit short time delay trouble to inform the type of user's trouble through the state of pilot lamp, and can close a floodgate once more after having investigated the trouble and reseing to it. Meanwhile, a rotary coding switch is arranged for setting the delay time, so that the delay time of short circuit short delay can be reasonably set according to the relationship between the upper level and the lower level in the power distribution system.

Claims (8)

1. An intelligent direct current protection controller which characterized in that: the detection end of the fault signal input unit is connected to an electric circuit to be detected, the output end of the fault signal input unit is connected to the input end of the main control unit, the output end of the main control unit is connected with the tripping driving unit and controls the tripping driving unit to act, and the power supply unit is used for supplying power.

2. The intelligent dc protection controller of claim 1, wherein: and the short-circuit state display unit is connected with the output end of the main control unit and controls the short-circuit state displayed by the main control unit.

3. The intelligent dc protection controller of claim 2, wherein: the short circuit state display unit comprises a short circuit instantaneous fault indicator lamp and a short circuit short delay fault indicator lamp, and the short circuit instantaneous fault indicator lamp and the short circuit short delay fault indicator lamp are different in light color.

4. The intelligent dc protection controller according to any one of claims 1 to 3, wherein: the time setting unit is used for setting a time reference for distinguishing short-circuit instantaneous faults and short-circuit short-delay faults and is electrically connected with the input end of the main control unit.

5. The intelligent dc protection controller of claim 4, wherein: the time setting unit is a rotary coding switch.

6. The intelligent dc protection controller according to any one of claims 1 to 3, wherein: the fault signal input unit comprises a microswitch, and a normally closed contact of the microswitch is connected to the input end of the main control unit.

7. The intelligent dc protection controller according to any one of claims 1 to 3, wherein: the reset circuit is connected to the input end of the main control unit, and the main control unit clears the short-circuit state display on the short-circuit state display unit after detecting a reset signal provided by the reset circuit.

8. The intelligent dc protection controller according to any one of claims 1 to 3, wherein: the main control unit provides a pulse signal through the tripping driving unit to drive the tripping coil to act.

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