CN221227126U - Phase-to-earth fault monitoring and protecting equipment - Google Patents
Phase-to-earth fault monitoring and protecting equipment Download PDFInfo
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- CN221227126U CN221227126U CN202322709394.5U CN202322709394U CN221227126U CN 221227126 U CN221227126 U CN 221227126U CN 202322709394 U CN202322709394 U CN 202322709394U CN 221227126 U CN221227126 U CN 221227126U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 85
- 238000004891 communication Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 12
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a phase-ground fault monitoring and protecting device, which comprises: a control unit and a power supply unit; the input end of the zero sequence current sampling unit is connected with phase current, and the output end of the zero sequence current sampling unit is connected with the sampling input end of the control unit; the input end of the tripping output unit is connected with the tripping output end of the control unit, and the output end of the tripping output unit controls the on-off of the single-phase loop; and the input end of the alarm unit is connected with the alarm output end of the control unit, and the output end of the alarm unit is connected with a fuse of the main loop. According to the utility model, by continuously monitoring the zero sequence current of each loop, when the zero sequence current meets the tripping condition, the control unit drives the corresponding tripping output unit to work, the relay acts to complete tripping, the power supply fault line is cut off, and the phase-earth zero sequence current leakage and fault protection functions are realized.
Description
Technical Field
The utility model relates to the technical field of power protection, in particular to phase-ground fault monitoring protection equipment.
Background
The protection of single-phase grounding short circuit in the low-voltage station service system can be realized by utilizing zero sequence current generated in a neutral point current transformer of a power transformer, or by utilizing a zero sequence current filtering device of a breaker of a low-voltage side bus power supply inlet circuit of the transformer, such as: the breaker obtains three-phase current vector sum by a self-contained zero-sequence current transformer to detect zero-sequence current.
The feeder line circuit on the bus for low-voltage factory should be equipped with single-phase grounding short-circuit protection, and can be used as single-phase grounding short-circuit protection, when the sensitivity of single-phase grounding short-circuit protection is insufficient, it should be equipped with single-phase grounding short-circuit protection device, and the device is formed from elements reflecting zero-sequence current, and after the protection action, the circuit breaker of the circuit is cut off in short time or instantaneously. The low-voltage feeder and the motor are also used as single-phase grounding protection by interphase short-circuit protection, and grounding short-circuit protection is additionally arranged when the sensitivity cannot be met. Because the sensitivity is difficult to judge and the investment is controlled, most of the zero sequence protection is not added; after operation, the fault phenomenon of override trip of zero sequence protection of the upper bus feeder occurs.
Disclosure of utility model
In order to solve the problems, the technical scheme provided by the utility model is as follows:
a phase-to-earth fault monitoring protection device comprising:
a control unit and a power supply unit;
The input end of the zero sequence current sampling unit is connected with phase current, and the output end of the zero sequence current sampling unit is connected with the sampling input end of the control unit;
The input end of the tripping output unit is connected with the tripping output end of the control unit, and the output end of the tripping output unit controls the on-off of the single-phase loop;
and the input end of the alarm unit is connected with the alarm output end of the control unit, and the output end of the alarm unit is connected with a fuse of the main loop.
The utility model is further arranged that the power supply unit comprises a switching power supply circuit and a reference voltage circuit; the input end of the switching power supply circuit is connected with an external input voltage, and the output end of the switching power supply circuit outputs a first forward voltage, a first reverse voltage and a second forward voltage respectively; the input end of the reference voltage circuit is connected with the first forward voltage, and the output end of the reference voltage circuit outputs a reference voltage.
The zero sequence current sampling unit further comprises a zero sequence current transformer CT1, a first operational amplifier U1A, a second operational amplifier U1B, a capacitor C1 and resistors R1-R8, wherein the input end of the zero sequence current transformer CT1 is connected with the phase current, the resistor R1 is connected in parallel with the output end of the zero sequence current transformer CT1, one end of the resistor R2 is connected with one end of the resistor R1, the other end of the resistor R2 is respectively connected with one end of the capacitor C1 and one end of the resistor R3, the other end of the capacitor C1 is grounded, one end of the resistor R4 and one end of the resistor R5 are respectively connected with the non-inverting input end of the first operational amplifier U1A, the other end of the resistor R4 is grounded, the output end of the first operational amplifier U1A is respectively connected with one end of the resistor R6, the non-inverting input end of the second operational amplifier U1B is respectively connected with the non-inverting input end of the first operational amplifier U1A, the non-inverting input end of the second operational amplifier U1B is connected with the non-inverting input end of the second operational amplifier U1A, the non-inverting input end of the second operational amplifier U1A is connected with the non-inverting input end of the first operational amplifier U1A, the second operational amplifier B is connected with the non-inverting input end of the first operational amplifier B1A is connected with the non-inverting input end of the first operational amplifier B1B.
The utility model further provides that the tripping output unit comprises a resistor R9, an optocoupler U1, a capacitor C2, a capacitor C3, a diode D1 and a relay K1, wherein one end of the resistor R9 is connected with a high level, the other end of the resistor R9 is connected with the positive pole of the optocoupler U1, the negative pole of the optocoupler U1 is connected with the tripping output end of the control unit, the emitting pole of the optocoupler U1 is connected with the first reverse voltage, the collecting pole of the optocoupler U1 is connected with one end of a coil of the relay K1, the other end of the coil of the relay K1 is connected with the first forward voltage, the capacitor C2, the capacitor C3 and the diode D1 are respectively connected in parallel with the two ends of the coil of the relay K1, and the contact of the relay K1 is connected on a single-phase loop.
The reference voltage circuit further comprises a third operational amplifier U2A, a capacitor C4, a capacitor C5, a resistor R10, a resistor R11, a resistor R12 and a shunt regulator U2, wherein one end of the capacitor C4 and one end of the resistor R10 are respectively connected with the first forward voltage, the other end of the capacitor C4 is grounded, the other end of the resistor R10 is respectively connected with a cathode of the shunt regulator U2, a reference end of the shunt regulator U2, one end of the capacitor C5 and one end of the resistor R11, the other end of the resistor R11 is respectively connected with one end of the resistor R12 and a non-inverting input end of the third operational amplifier U2A, an anode of the shunt regulator U2, the other end of the capacitor C5 and the other end of the resistor R12 are all grounded, an inverting input end of the third operational amplifier U2A is connected with an output end of the third operational amplifier U2A, and an output end of the third operational amplifier U2A outputs the reference voltage.
The utility model is further arranged that the alarm unit comprises a leakage alarm circuit, a fault alarm circuit and a power failure alarm circuit;
The leakage alarm circuit comprises a resistor R13, a triode Q1, a relay K2, a capacitor C6, a capacitor C7 and a diode D2, wherein one end of the resistor R13 is connected with a leakage alarm output end of the control unit, the other end of the resistor R13 is connected with a base electrode of the triode Q1, an emitting electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is connected with one end of a coil of the relay K2, the other end of the coil of the relay K2 is connected with the first forward voltage, a contact of the relay K2 is connected with a fuse CH4 of a total loop, and the capacitor C6, the capacitor C7 and the diode D2 are respectively connected at two ends of the coil of the relay K2 in parallel;
The fault alarm circuit comprises a resistor R14, a triode Q2, a relay K3, a capacitor C8, a capacitor C9 and a diode D3, wherein one end of the resistor R14 is connected with a leakage alarm output end of the control unit, the other end of the resistor R14 is connected with a base electrode of the triode Q2, an emitting electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is connected with one end of a coil of the relay K3, the other end of the coil of the relay K3 is connected with the first forward voltage, a contact of the relay K3 is connected with a fuse CH3 of a total loop, and the capacitor C8, the capacitor C9 and the diode D3 are respectively connected at two ends of the coil of the relay K3 in parallel;
The power failure warning circuit comprises a relay K4, a capacitor C10, a capacitor C11 and a diode D4, one end of a coil of the relay K4 is grounded, the other end of the coil of the relay K4 is connected with the first reverse voltage, the capacitor C10, the capacitor C11 and the diode D4 are respectively connected with two ends of the coil of the relay K4 in parallel, and a contact of the relay K4 is connected with a fuse CH5 of a total loop.
The utility model further provides a display unit, wherein the input end of the display unit is connected with the display output end of the control unit, and the display unit comprises at least one of an LED display module and an LCD display module.
The utility model is further arranged to further comprise a storage unit, which is connected with the control unit.
The utility model further provides a communication unit which is in communication connection with the control unit.
The utility model further provides a key unit, wherein the output end of the key unit is connected with the key input end of the control unit.
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
According to the technical scheme, the zero-sequence current of each loop is continuously monitored, when the zero-sequence current meets the tripping condition, the control unit drives the corresponding tripping output unit to work, the relay acts to complete tripping, the power supply fault line is cut off, the phase-to-ground zero-sequence current leakage and fault protection functions are realized, meanwhile, the alarm display is used for prompting the zero-sequence protection action to exit operation, the setting value (current threshold value and delay) of phase-to-ground short-circuit protection is adjusted, and huge economic loss caused by override tripping and power failure is avoided.
Drawings
Fig. 1 is a schematic block diagram of a phase-to-earth fault monitoring protection device according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a switching power supply according to an embodiment of the utility model.
Fig. 3 is a schematic diagram of a second forward voltage conversion circuit according to an embodiment of the utility model.
Fig. 4 is a schematic diagram of a zero sequence current sampling unit according to an embodiment of the present utility model.
Fig. 5 is a schematic diagram of a trip output unit in accordance with an embodiment of the present utility model.
FIG. 6 is a schematic diagram of a reference voltage circuit according to an embodiment of the utility model.
Fig. 7 is a schematic diagram of a leakage alarm circuit according to an embodiment of the present utility model.
FIG. 8 is a schematic diagram of a fault alarm circuit in accordance with an embodiment of the present utility model.
Fig. 9 is a schematic diagram of a power-down warning circuit according to an embodiment of the utility model.
Fig. 10 is a schematic diagram of a general loop fuse circuit according to an embodiment of the present utility model.
Fig. 11 is a schematic diagram of a control unit according to an embodiment of the present utility model.
FIG. 12 is a schematic diagram of a memory cell according to an embodiment of the utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
With reference to fig. 1 to 12, the technical scheme of the utility model is a phase-to-ground fault monitoring protection device, which comprises:
A control unit 10 and a power supply unit 20;
At least one path of zero sequence current sampling unit 30, wherein the input end of the zero sequence current sampling unit 30 is connected with phase current, and the output end of the zero sequence current sampling unit 30 is connected with the sampling input end of the control unit 10;
At least one path of tripping output unit 40, wherein the input end of the tripping output unit 40 is connected with the tripping output end of the control unit 10, and the output end of the tripping output unit 40 controls the on-off of a single-phase loop;
And the input end of the alarm unit 50 is connected with the alarm output end of the control unit 10, and the output end of the alarm unit 50 is connected with a fuse of the main loop.
In the present embodiment, the power supply unit 20 includes a switching power supply circuit and a reference voltage circuit; the input end of the switching power supply circuit is connected with an external input voltage, and the output end of the switching power supply circuit outputs a first forward voltage, a first reverse voltage and a second forward voltage respectively; the input end of the reference voltage circuit is connected with the first forward voltage, and the output end of the reference voltage circuit outputs a reference voltage.
In the above embodiment, the control unit 10 is an STM32F103 series MCU, the switching power supply chip adopted in the switching power supply circuit is YAT10-05H12-W1, the first forward voltage is +12v, the first reverse voltage is-12V, the second forward voltage is +5v, and the reference voltage circuit is obtained by conversion of +12v, see the following embodiment.
In the above embodiment, the voltage conversion circuit converting 5V to 3.3V is further included, as shown in fig. 3, and the voltage is reduced by a voltage stabilizer chip with the model number of SPX1117M 3-3.3V.
In this embodiment, as shown in fig. 4, the zero sequence current sampling unit 30 includes a zero sequence current transformer CT1, a first operational amplifier U1A, a second operational amplifier U1B, a capacitor C1 and resistors R1 to R8, wherein an input end of the zero sequence current transformer CT1 is connected to the phase current, the resistor R1 is connected in parallel to an output end of the zero sequence current transformer CT1, one end of the resistor R2 is connected to one end of the resistor R1, the other end of the resistor R2 is connected to one end of the capacitor C1 and one end of the resistor R3 respectively, the other end of the capacitor C1 is grounded, the other end of the resistor R3 is connected to a non-inverting input end of the first operational amplifier U1A, one end of the resistor R4 and one end of the resistor R5 are connected to an inverting input end of the first operational amplifier U1A respectively, the other end of the resistor R4 is grounded, the output end of the first operational amplifier U1A is respectively connected with the other end of the resistor R5 and one end of the resistor R6, the other end of the resistor R6 is respectively connected with the inverting input end of the second operational amplifier U1B and one end of the resistor R8, the other end of the resistor R8 is connected with the output end of the second operational amplifier U1B, one end of the resistor R7 is connected with the reference voltage, the other end of the resistor R7 is connected with the non-inverting input end of the second operational amplifier U1B, the power positive input end of the first operational amplifier U1A and the power positive input end of the second operational amplifier U1B are both connected with the first forward voltage, the power negative input end of the first operational amplifier U1A and the power negative input end of the second operational amplifier U1B are both connected with the first reverse voltage, and the output end of the second operational amplifier U1B outputs a zero-sequence current sampling signal.
In the embodiment, the zero sequence current transformer is used for collecting the phase current, and the cascade operational amplifier circuit is used for operational amplifying to obtain the final leakage current sampling signal, so that the sampling precision of the phase current is improved.
In this embodiment, the trip output unit includes a resistor R9, an optocoupler U1, a capacitor C2, a capacitor C3, a diode D1 and a relay K1, one end of the resistor R9 is connected to a high level, the other end of the resistor R9 is connected to an anode of the optocoupler U1, a cathode of the optocoupler U1 is connected to a trip output end of the control unit, an emitter of the optocoupler U1 is connected to the first reverse voltage, a collector of the optocoupler U1 is connected to one end of a coil of the relay K1, the other end of the coil of the relay K1 is connected to the first forward voltage, the capacitor C2, the capacitor C3 and the diode D1 are respectively connected in parallel to two ends of the coil of the relay K1, and a contact of the relay K1 is connected to a single-phase loop.
In the above embodiment, the capacitor C3 is an electrolytic capacitor; the control unit controls the relay through the optocoupler isolation, and transient voltage generated by the relay is prevented from affecting the control unit.
In this embodiment, the reference voltage circuit includes a third operational amplifier U2A, a capacitor C4, a capacitor C5, a resistor R10, a resistor R11, a resistor R12, and a shunt regulator U2, where the capacitor C5 is an electrolytic capacitor, one end of the capacitor C4 and one end of the resistor R10 are respectively connected to the first forward voltage, the other end of the capacitor C4 is grounded, the other end of the resistor R10 is respectively connected to the cathode of the shunt regulator U2, the reference end of the shunt regulator U2, one end of the capacitor C5, and one end of the resistor R11, the other end of the resistor R11 is respectively connected to one end of the resistor R12 and the non-inverting input end of the third operational amplifier U2A, the anode of the shunt regulator U2, the other end of the capacitor C5, and the other end of the resistor R12 are all grounded, the inverting input end of the third operational amplifier U2A is connected to the output end of the third operational amplifier U2A, and the output voltage of the third operational amplifier U2A is connected to the reference voltage VREF.
In this embodiment, the alarm unit includes a leakage alarm circuit, a fault alarm circuit, and a power failure alarm circuit;
The leakage alarm circuit comprises a resistor R13, a triode Q1, a relay K2, a capacitor C6, a capacitor C7 and a diode D2, wherein the capacitor C6 is an electrolytic capacitor, one end of the resistor R13 is connected with a leakage alarm output end of the control unit, the other end of the resistor R13 is connected with a base electrode of the triode Q1, an emitting electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is connected with one end of a coil of the relay K2, the other end of the coil of the relay K2 is connected with a first forward voltage, a contact LDout-COM of the relay K2 is connected with a fuse CH4 of a total loop, and the capacitor C6, the capacitor C7 and the diode D2 are respectively connected with two ends of the coil of the relay K2 in parallel;
the fault alarm circuit comprises a resistor R14, a triode Q2, a relay K3, a capacitor C8, a capacitor C9 and a diode D3, wherein the capacitor C8 is an electrolytic capacitor, one end of the resistor R14 is connected with a leakage alarm output end of the control unit, the other end of the resistor R14 is connected with a base electrode of the triode Q2, an emitting electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is connected with one end of a coil of the relay K3, the other end of the coil of the relay K3 is connected with a first forward voltage, a contact GZout-COM of the relay K3 is connected with a fuse CH3 of a total loop, and the capacitor C8, the capacitor C9 and the diode D3 are respectively connected with two ends of the coil of the relay K3 in parallel;
The power failure warning circuit comprises a relay K4, a capacitor C10, a capacitor C11 and a diode D4, wherein the capacitor C10 is an electrolytic capacitor, one end of a coil of the relay K4 is grounded, the other end of the coil of the relay K4 is connected with the first reverse voltage, the capacitor C10, the capacitor C11 and the diode D4 are respectively connected with two ends of the coil of the relay K4 in parallel, and a contact DDout-COM of the relay K4 is connected with a fuse CH5 of a total loop.
In the above embodiment, the fault alarm circuit and the leakage alarm circuit are both controlled by an output pin of the control unit; the power down warning circuit monitors a first reverse voltage in the switching power supply.
In this embodiment, the display device further includes a display unit, an input end of the display unit is connected to a display output end of the control unit, and the display unit includes at least one of an LED display module and an LCD display module; the LED display module comprises an LED driving circuit and an LED indicating circuit.
In this embodiment, the device further includes a storage unit, where the storage unit is connected to the control unit; as shown in fig. 12, the model of the storage unit is MB85RS16T.
In this embodiment, the device further includes a communication unit, where the communication unit is connected with the control unit in a communication manner; optionally, the communication unit may be RS485 communication or CAN bus communication.
In this embodiment, the electronic device further includes a key unit, and an output end of the key unit is connected to a key input end of the control unit.
According to the phase-earth fault monitoring protection device, zero-sequence currents of all loops are monitored continuously, when the zero-sequence currents meet tripping conditions, the control unit drives the corresponding tripping output units to work, the relay acts to complete tripping, a power supply fault line is cut off, phase-earth zero-sequence current leakage and fault protection functions are achieved, meanwhile, alarm display is carried out to prompt the zero-sequence protection act to exit operation, setting values (current threshold and delay) of phase-earth short-circuit protection are adjusted, and huge economic losses caused by override tripping power failure are avoided.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A phase-to-earth fault monitoring protection device, comprising:
a control unit and a power supply unit;
The input end of the zero sequence current sampling unit is connected with phase current, and the output end of the zero sequence current sampling unit is connected with the sampling input end of the control unit;
The input end of the tripping output unit is connected with the tripping output end of the control unit, and the output end of the tripping output unit controls the on-off of the single-phase loop;
and the input end of the alarm unit is connected with the alarm output end of the control unit, and the output end of the alarm unit is connected with a fuse of the main loop.
2. A phase-to-ground fault monitoring protection device as claimed in claim 1, wherein the power supply unit comprises a switching power supply circuit and a reference voltage circuit; the input end of the switching power supply circuit is connected with an external input voltage, and the output end of the switching power supply circuit outputs a first forward voltage, a first reverse voltage and a second forward voltage respectively; the input end of the reference voltage circuit is connected with the first forward voltage, and the output end of the reference voltage circuit outputs a reference voltage.
3. The phase-to-ground fault monitoring protection device according to claim 2, wherein the zero sequence current sampling unit comprises a zero sequence current transformer CT1, a first operational amplifier U1A, a second operational amplifier U1B, a capacitor C1 and resistors R1-R8, wherein the input end of the zero sequence current transformer CT1 is connected with the phase current, the resistor R1 is connected in parallel with the output end of the zero sequence current transformer CT1, one end of the resistor R2 is connected with one end of the resistor R1, the other end of the resistor R2 is respectively connected with one end of the capacitor C1 and one end of the resistor R3, the other end of the capacitor C1 is grounded, the other end of the resistor R3 is connected with the non-inverting input end of the first operational amplifier U1A, one end of the resistor R4 and one end of the resistor R5 are respectively connected with the inverting input end of the first operational amplifier U1A, the other end of the resistor R4 is grounded, the output end of the first operational amplifier U1A is respectively connected with the other end of the resistor R5 and one end of the resistor R6, the other end of the resistor R6 is respectively connected with the inverting input end of the second operational amplifier U1B and one end of the resistor R8, the other end of the resistor R8 is connected with the output end of the second operational amplifier U1B, one end of the resistor R7 is connected with the reference voltage, the other end of the resistor R7 is connected with the non-inverting input end of the second operational amplifier U1B, the power positive input end of the first operational amplifier U1A and the power positive input end of the second operational amplifier U1B are both connected with the first forward voltage, the power negative input end of the first operational amplifier U1A and the power negative input end of the second operational amplifier U1B are both connected with the first reverse voltage, and the output end of the second operational amplifier U1B outputs a zero-sequence current sampling signal.
4. The phase-to-ground fault monitoring protection device according to claim 2, wherein the trip output unit comprises a resistor R9, an optocoupler U1, a capacitor C2, a capacitor C3, a diode D1 and a relay K1, one end of the resistor R9 is connected with a high level, the other end of the resistor R9 is connected with the positive electrode of the optocoupler U1, the negative electrode of the optocoupler U1 is connected with the trip output end of the control unit, the emitter of the optocoupler U1 is connected with the first reverse voltage, the collector of the optocoupler U1 is connected with one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected with the first forward voltage, the capacitor C2, the capacitor C3 and the diode D1 are respectively connected with the two ends of the coil of the relay K1 in parallel, and the contact of the relay K1 is connected on a single-phase loop.
5. The phase-to-ground fault monitoring protection device according to claim 2, wherein the reference voltage circuit comprises a third operational amplifier U2A, a capacitor C4, a capacitor C5, a resistor R10, a resistor R11, a resistor R12 and a shunt regulator U2, one end of the capacitor C4 and one end of the resistor R10 are respectively connected to the first forward voltage, the other end of the capacitor C4 is grounded, the other end of the resistor R10 is respectively connected to the cathode of the shunt regulator U2, the reference end of the shunt regulator U2, one end of the capacitor C5 and one end of the resistor R11, the other end of the resistor R11 is respectively connected to one end of the resistor R12 and the non-inverting input end of the third operational amplifier U2A, the anode of the shunt regulator U2, the other end of the capacitor C5 and the other end of the resistor R12 are all grounded, and the inverting input end of the third operational amplifier U2A is connected to the output end of the third operational amplifier U2A, and the output end of the third operational amplifier U2A is grounded.
6. A phase-to-earth fault monitoring and protection device according to claim 2, wherein the alarm unit comprises a leakage alarm circuit, a fault alarm circuit and a power down alarm circuit;
The leakage alarm circuit comprises a resistor R13, a triode Q1, a relay K2, a capacitor C6, a capacitor C7 and a diode D2, wherein one end of the resistor R13 is connected with a leakage alarm output end of the control unit, the other end of the resistor R13 is connected with a base electrode of the triode Q1, an emitting electrode of the triode Q1 is grounded, a collector electrode of the triode Q1 is connected with one end of a coil of the relay K2, the other end of the coil of the relay K2 is connected with the first forward voltage, a contact of the relay K2 is connected with a fuse CH4 of a total loop, and the capacitor C6, the capacitor C7 and the diode D2 are respectively connected at two ends of the coil of the relay K2 in parallel;
The fault alarm circuit comprises a resistor R14, a triode Q2, a relay K3, a capacitor C8, a capacitor C9 and a diode D3, wherein one end of the resistor R14 is connected with a leakage alarm output end of the control unit, the other end of the resistor R14 is connected with a base electrode of the triode Q2, an emitting electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is connected with one end of a coil of the relay K3, the other end of the coil of the relay K3 is connected with the first forward voltage, a contact of the relay K3 is connected with a fuse CH3 of a total loop, and the capacitor C8, the capacitor C9 and the diode D3 are respectively connected at two ends of the coil of the relay K3 in parallel;
The power failure warning circuit comprises a relay K4, a capacitor C10, a capacitor C11 and a diode D4, one end of a coil of the relay K4 is grounded, the other end of the coil of the relay K4 is connected with the first reverse voltage, the capacitor C10, the capacitor C11 and the diode D4 are respectively connected with two ends of the coil of the relay K4 in parallel, and a contact of the relay K4 is connected with a fuse CH5 of a total loop.
7. The phase-to-earth fault monitoring and protecting device according to any one of claims 1 to 6, further comprising a display unit, wherein an input end of the display unit is connected to a display output end of the control unit, and the display unit comprises at least one of an LED display module and an LCD display module.
8. A phase-to-earth fault monitoring protection device according to any one of claims 1 to 6, further comprising a storage unit connected to the control unit.
9. A phase-to-earth fault monitoring and protection device according to any one of claims 1 to 6, further comprising a communication unit in communication with the control unit.
10. A phase-to-earth fault monitoring and protection device according to any one of claims 1 to 6, further comprising a key unit, an output of the key unit being connected to a key input of the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322709394.5U CN221227126U (en) | 2023-10-10 | 2023-10-10 | Phase-to-earth fault monitoring and protecting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322709394.5U CN221227126U (en) | 2023-10-10 | 2023-10-10 | Phase-to-earth fault monitoring and protecting equipment |
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