CN212010886U - Three-phase open-phase protection and leakage circuit breaker - Google Patents
Three-phase open-phase protection and leakage circuit breaker Download PDFInfo
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- CN212010886U CN212010886U CN202021139313.2U CN202021139313U CN212010886U CN 212010886 U CN212010886 U CN 212010886U CN 202021139313 U CN202021139313 U CN 202021139313U CN 212010886 U CN212010886 U CN 212010886U
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Abstract
The utility model relates to a three-phase lacks looks protection and electric leakage circuit breaker, including current detection circuit, level generating circuit and triode switch circuit, current detection circuit includes zero sequence transformer ZCT, resistance R8, resistance R9, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, polarity electric capacity C9 and control chip U1, zero sequence transformer ZCT is connected with the three-phase electricity, zero sequence transformer ZCT's one end and control chip U1's No. 1 pin are established ties, zero sequence transformer ZCT's the other end passes through series resistance R9 and establishes ties with control chip U1's No. 2 pin, parallel connection has resistance R8 on zero sequence transformer ZCT's the both ends. The utility model has the advantages that: the circuit breaker has the advantages of simple structure, convenient installation, controllable silicon output, stable and reliable circuit operation, low manufacturing cost, small volume, low power consumption, long service life, no arc generation during action and the like compared with the traditional circuit breaker.
Description
Technical Field
The utility model relates to the technical field of power, in particular to three-phase lacks looks protection and electric leakage circuit breaker concurrently.
Background
Three-phase alternating current is a form of delivery of electrical energy, referred to as three-phase power for short. The three-phase AC power supply consists of three AC potentials with the same frequency, equal amplitude and phase difference of 120 deg. Three-phase alternating current is used in many applications, and most of the alternating current electric devices in industry, such as motors, cranes, central air conditioning compressors, and the like, adopt three-phase alternating current. At present, three-phase electric equipment in the technical field of engineering works by depending on three-phase alternating current provided by three-phase power supply equipment, and the three-phase electric equipment is designed and works on the basis of stable three-phase power supply and no phase loss, so that the equipment needs to work normally and needs to ensure normal power supply of the required three-phase alternating current, and when a certain phase of the three-phase alternating current is lost, if no phase loss protection exists, the equipment can be damaged due to forced operation.
The current open-phase protection design generally relates to modularization, multi-level control or phase sequence comparison and other designs, so as to complete open-phase judgment and timely output an alarm signal and a stop signal, thereby achieving the open-phase protection purpose of three-phase electric equipment. For example, the A phase and the B phase of a three-phase power supply control a first module, the B phase and the C phase control a second module, and when the three-phase power supply works normally or lacks the phase, the first module controls whether to output a high level to control the on and off of a power device so as to achieve the purpose of open-phase protection.
The design method used by the existing open-phase protection is complex, the circuit structure is complex, and the number of components is too many, so that the production cost is increased, and the complex circuit structure brings adverse effects on the reliability of the whole machine performance.
SUMMERY OF THE UTILITY MODEL
The present invention provides a three-phase open-phase and leakage circuit breaker, which solves the above problems.
The technical scheme of the utility model is realized like this: a three-phase open-phase protection and leakage circuit breaker comprises a current detection circuit, a level generation circuit and a triode switch circuit, wherein the current detection circuit comprises a zero sequence transformer ZCT, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a polar capacitor C9 and a control chip U1, the zero sequence transformer ZCT is connected with three phases, one end of the zero sequence transformer ZCT is connected with a pin 1 of the control chip U1 in series, the other end of the zero sequence transformer ZCT is connected with a pin 2 of the control chip U1 in series through a series resistor R9, a resistor R8 is connected in parallel at two ends of the zero sequence transformer ZCT, the pin 2 of the control chip U1 is connected with a pin 8 of the control chip U1 through a resistor R9, a capacitor C3, a capacitor C4 and a polar capacitor C9 which are connected in series in sequence, the anode of the polar capacitor C9 is connected with a pin 8 of the control chip U1, no. 6 pin of control chip U1 is connected with No. 7 pin of control chip U1 through series capacitance C5, No. 4 pin and No. 5 pin of control chip U1 all set up through electric capacity C6 ground connection, No. 3 pin ground connection of control chip U1 sets up.
By adopting the technical scheme, when the three-phase current passing through the zero sequence transformer is balanced and the induced current is zero when the circuit breaker normally works, when electric leakage occurs, the three-phase current passing through the zero sequence transformer is unbalanced and the induced current is not zero, the induced current is output to the detection signal input end of the control chip through the induction of the zero sequence transformer by the electromagnetic induction principle, and the trigger signal is output through comparison and amplification to enable the silicon controlled rectifier to be conducted. When the triode is in a saturation conduction state all the time, the collector and the emitter are conducted, the emitter is grounded, so that the potential of the collector is zero through the serial connection of the control chip power supply and voltage division, the collector outputs a low level, no trigger signal exists, and the thyristor is not conducted. When the phase is lost, the voltage divided to the base electrode of the triode is lower than the voltage stabilizing value of a given voltage stabilizing tube, the triode is in a cut-off state, the collector and the emitter are not conducted, because the potential divided to the collector by the control chip power supply in series is greater than the voltage stabilizing value of the collector voltage stabilizing tube, the voltage stabilizing tube is conducted, the voltage is rectified by a rectifier diode and then input into the control chip to compare and output a high level to trigger the silicon controlled rectifier to be conducted, the attraction iron core spring acts to separate the upper contact and the lower contact of the circuit breaker, the phase loss protection is completed, and the resistor R8 is the load resistor of the zero; the utility model discloses simple structure, simple to operate, silicon controlled rectifier output, circuit job stabilization is reliable, compares with traditional circuit breaker, has low in manufacturing cost, and is small, advantages such as no electric arc production during low power dissipation, longe-lived, action.
The utility model discloses further set up to: the level generating circuit comprises a silicon controlled SCR1, a silicon controlled SCR2, a release L1, a diode D7, a resistor R7, a capacitor C7 and a capacitor C7, wherein one end of the release L7 is connected in series with an anode A of the silicon controlled SCR 7, an anode A of the silicon controlled SCR 7 is connected in series with an anode of the diode D7, the diode D7 is connected in parallel with the release L7, the anode A of the silicon controlled SCR 7 is grounded through the resistor R7 and the resistor R7 which are connected in series in sequence, a control electrode G of the silicon controlled SCR 7 is connected in series with a cathode of the diode D7, a cathode K of the silicon controlled SCR 7 is connected with a cathode of the diode D7 through the series capacitor C7, a cathode K of the silicon controlled SCR 7 is connected in series with an anode A of the silicon controlled SCR 7, one end of the resistor R7 connected with the resistor R7 is connected in series with the anode A of the silicon controlled SCR 7, the SCR 7 is connected in series with the anode of the silicon controlled SCR 7, the control electrode G of the SCR2 is grounded through a series capacitor C2.
By adopting the technical scheme, the resistors R1 and R2 are connected in series to serve as voltage-sharing resistors and are connected to the anode of the SCR2 in a voltage-sharing mode, so that the SCR1 and the SCR2 are enabled to be conducted simultaneously, and the total direct-current voltage is evenly distributed on two controllable silicon to prevent breakdown; the capacitors C1 and C2 mainly prevent various noise interferences from triggering the silicon controlled rectifier by mistake, and play a role in inhibiting the noise interference; the resistor R6 is a current-limiting resistor, and prevents the trigger transient current from being too large to break down the PN junction of the silicon controlled rectifier.
The utility model discloses further set up to: the cathode of the diode D7 is connected in series with the cathode of the diode D2, the cathode of the diode D4 and the cathode of the diode D6, the anode of the diode D2 is connected in series with the cathode of the diode D1, the anode of the diode D4 is connected in series with the cathode of the diode D3, the anode of the diode D6 is connected in series with the cathode of the diode D5, the anode of the diode D2, the anode of the diode D4 and the anode of the diode D6 are connected with the phases a, phases B and C of the three-phase power, the anode of the diode D1, the anode of the diode D3 and the anode of the diode D5 are all grounded, and one end of the trip L1 connected with the cathode of the diode D7 is grounded through a series piezoresistor RV 1.
By adopting the technical scheme, a stable and effective power supply can be provided for the circuit.
The utility model discloses further set up to: the triode switch circuit comprises a triode Q1, a collector voltage regulator Z1, a base voltage regulator Z2, a resistor R3, a resistor R4, a resistor R5, a resistor R7, a polar capacitor C7, a polar capacitor C8, a diode D9 and a potentiometer RP1, wherein a collector C of the triode Q1 is connected with the cathode of the diode D5 through a resistor R5 and a resistor R5 which are sequentially connected in series, one end of the resistor R5 connected with the resistor R5 is connected with a No. 8 pin of a control chip U5 in series, a base b of the triode Q5 is connected with the anode of the base voltage regulator Z5 in series, the cathode of the base voltage regulator Z5 is connected with the anode of the polar capacitor C5 in series, the cathode of the polar capacitor C5 is grounded, the cathode of the base voltage regulator Z5 is grounded through the potentiometer 5, the cathode of the base voltage regulator Z5 is connected with the cathode of the diode D5 through the resistor R5 in series, and the emitter of the triode Q5 is grounded, a resistor R7 and a polar capacitor C7 are respectively connected in parallel between a collector C and an emitter e of the triode Q1, the cathode of the polar capacitor C7 is grounded, the collector C of the triode Q1 is connected in series with the cathode of a collector voltage-regulator tube Z1, the anode of the collector voltage-regulator tube Z1 is connected in series with the anode of a diode D9, and the cathode of the diode D9 is connected with a No. 4 pin of a control chip U1.
Through adopting above-mentioned technical scheme, direct current working power supply is through R3, electric capacity C7 filters the back and potentiometre RP1 partial pressure to stabilivolt Z2's negative pole, stabilivolt Z2's positive pole connects the base of triode, potentiometre RP1 adjusts the minimum operating voltage of three-phase, the collector is the output, through electric capacity C8 filtering when exporting, resistance R5 and R7 partial pressure carry out the steady voltage to stabilivolt Z1 of collector, diode D9 rectification carries out comparison output to control chip the utility model discloses further set up to: the three-phase power is 380V and 50HZ alternating current.
By adopting the technical scheme, the three-phase power supply can be suitable for circuits, and can effectively and accurately detect and protect three-phase power.
The utility model discloses further set up to: the control chip U1 is internally integrated with a voltage stabilizer, a differential amplifier and a latch circuit.
By adopting the technical scheme, the detection signal output by the zero sequence transformer can be amplified to conduct the controllable silicon, so that the use is more stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a three-phase open-phase protection and leakage breaker, including a current detection circuit 1, a level generation circuit 2 and a triode switch circuit 3, the current detection circuit 1 includes a zero sequence transformer ZCT, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a polar capacitor C9 and a control chip U1, the zero sequence transformer ZCT is connected with three-phase power, one end of the zero sequence transformer ZCT is connected in series with pin 1 of the control chip U1, the other end of the zero sequence transformer ZCT is connected in series with pin 2 of the control chip U1 through a series resistor R9, a resistor R8 is connected in parallel at both ends of the zero sequence transformer ZCT, pin 2 of the control chip U1 is connected with pin 8 of the control chip U1 through a series resistor R9, a capacitor C3, a capacitor C4, a polar capacitor C9 is connected with pin 8 of the control chip U3529, no. 6 pin of control chip U1 is connected with No. 7 pin of control chip U1 through series capacitance C5, No. 4 pin and No. 5 pin of control chip U1 all set up through electric capacity C6 ground connection, No. 3 pin ground connection of control chip U1 sets up.
By adopting the technical scheme, when the three-phase current passing through the zero sequence transformer is balanced and the induced current is zero when the circuit breaker normally works, when electric leakage occurs, the three-phase current passing through the zero sequence transformer is unbalanced and the induced current is not zero, the induced current is output to the detection signal input end of the control chip through the induction of the zero sequence transformer by the electromagnetic induction principle, and the trigger signal is output through comparison and amplification to enable the silicon controlled rectifier to be conducted. When the triode is in a saturation conduction state all the time, the collector and the emitter are conducted, the emitter is grounded, so that the potential of the collector is zero through the serial connection of the control chip power supply and voltage division, the collector outputs a low level, no trigger signal exists, and the thyristor is not conducted. When the phase is lost, the voltage divided to the base electrode of the triode is lower than the voltage stabilizing value of a given voltage stabilizing tube, the triode is in a cut-off state, the collector and the emitter are not conducted, because the potential divided to the collector by the control chip power supply in series is greater than the voltage stabilizing value of the collector voltage stabilizing tube, the voltage stabilizing tube is conducted, the voltage is rectified by a rectifier diode and then input into the control chip to compare and output a high level to trigger the silicon controlled rectifier to be conducted, the attraction iron core spring acts to separate the upper contact and the lower contact of the circuit breaker, the phase loss protection is completed, and the resistor R8 is the load resistor of the zero; the utility model discloses simple structure, simple to operate, silicon controlled rectifier output, circuit job stabilization is reliable, compares with traditional circuit breaker, has low in manufacturing cost, and is small, advantages such as no electric arc production during low power dissipation, longe-lived, action.
In the embodiment of the present invention, the level generating circuit 2 includes a SCR1, a SCR2, a trip L1, a diode D7, a resistor R7, a capacitor C7, and a capacitor C7, one end of the trip L7 is connected in series with an anode a of the SCR 7, an anode a of the SCR 7 is connected in series with an anode of the diode D7, the diode D7 is connected in parallel with the trip L7, the anode a of the SCR 7 is connected to ground via the resistor R7 and the resistor R7 which are connected in series, a control electrode G of the SCR 7 is connected in series with a cathode of the diode D7, a cathode K of the SCR 7 is connected in series with a cathode of the diode D7 via the capacitor C7, a cathode K of the SCR 7 is connected in series with the anode a of the SCR 7, one end of the SCR R7 connected with the resistor R7 is connected in series with the anode a of the SCR 7, the SCR 7 is connected in series with the anode of the diode D7, the control electrode G of the SCR2 is grounded through a series capacitor C2.
By adopting the technical scheme, the resistors R1 and R2 are connected in series to serve as voltage-sharing resistors and are connected to the anode of the SCR2 in a voltage-sharing mode, so that the SCR1 and the SCR2 are enabled to be conducted simultaneously, and the total direct-current voltage is evenly distributed on two controllable silicon to prevent breakdown; the capacitors C1 and C2 mainly prevent various noise interferences from triggering the silicon controlled rectifier by mistake, and play a role in inhibiting the noise interference; the resistor R6 is a current-limiting resistor, and prevents the trigger transient current from being too large to break down the PN junction of the silicon controlled rectifier.
In the embodiment of the present invention, the cathode of the diode D7 is connected in series with the cathode of the diode D2, the cathode of the diode D4 and the cathode of the diode D6, the anode of the diode D2 is connected in series with the cathode of the diode D1, the anode of the diode D4 is connected in series with the cathode of the diode D3, the anode of the diode D6 is connected in series with the cathode of the diode D5, the anode of the diode D2, the anode of the diode D4 and the anode of the diode D6 are connected to the phases a, B and C of the three-phase power respectively, the anode of the diode D1, the anode of the diode D3 and the anode of the diode D5 are all grounded, and one end of the release L1 connected to the cathode of the diode D7 is grounded through the series voltage-dependent resistor RV 1.
By adopting the technical scheme, a stable and effective power supply can be provided for the circuit.
In the embodiment of the present invention, the triode switch circuit 3 includes a triode Q1, a collector regulator Z1, a base regulator Z2, a resistor R3, a resistor R4, a resistor R5, a resistor R7, a polar capacitor C7, a polar capacitor C8, a diode D9, and a potentiometer RP1, the collector C of the triode Q1 is connected to the cathode of the diode D7 through a resistor R5 and a resistor R4 connected in series in sequence, one end of the resistor R5 connected to the resistor R4 is connected in series with the pin No. 8 of the control chip U1, the base b of the triode Q1 is connected in series with the anode of the base regulator Z2, the cathode of the base regulator Z2 is connected in series with the anode of the polar capacitor C8, the cathode of the polar capacitor C8 is grounded, the cathode of the base regulator Z2 is grounded through the potentiometer RP1, the cathode of the base regulator Z2 is connected to the cathode of the diode D7 through a resistor R3 connected in series, an emitter e of the triode Q1 is grounded, a resistor R7 and a polar capacitor C7 are respectively connected in parallel between a collector C and the emitter e of the triode Q1, a cathode of the polar capacitor C7 is grounded, the collector C of the triode Q1 is connected in series with a cathode of a collector voltage regulator Z1, an anode of the collector voltage regulator Z1 is connected in series with an anode of the diode D9, and a cathode of the diode D9 is connected with a No. 4 pin of the control chip U1.
Through adopting above-mentioned technical scheme, direct current working power supply is through R3, electric capacity C7 after filtering with potentiometre RP1 partial pressure to the negative pole of stabilivolt Z2, stabilivolt Z2's positive pole connects the base of triode, potentiometre RP1 adjusts the minimum operating voltage of three-phase, the collector is the output, through electric capacity C8 filtering when exporting, resistance R5 and R7 partial pressure carry out the steady voltage to stabilivolt Z1 of collector, diode D9 rectification carries out comparison output to control chip in the embodiment of the utility model, the three-phase electricity is 380V, 50 HZ's alternating current.
By adopting the technical scheme, the three-phase power supply can be suitable for circuits, and can effectively and accurately detect and protect three-phase power.
In the embodiment of the present invention, the control chip U1 is internally integrated with a voltage regulator, a differential amplifier and a latch circuit.
By adopting the technical scheme, the detection signal output by the zero sequence transformer can be amplified to conduct the controllable silicon, so that the use is more stable.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a three-phase open-phase protection and electric leakage circuit breaker which characterized in that: the current detection circuit (1) comprises a zero sequence transformer ZCT, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a polar capacitor C9 and a control chip U1, wherein the zero sequence transformer ZCT is connected with three phases, one end of the zero sequence transformer ZCT is connected with a pin 1 of the control chip U1 in series, the other end of the zero sequence transformer ZCT is connected with a pin 2 of the control chip U1 in series through a series resistor R9, a resistor R8 is connected in parallel to two ends of the zero sequence transformer ZCT, the pin 2 of the control chip U1 is connected with a pin 8 of the control chip U1 through a resistor R9, a capacitor C3, a capacitor C4 and a polar capacitor C9 which are connected in series in sequence, and the anode of the polar capacitor C9 is connected with a pin 8 of the control chip U1, no. 6 pin of control chip U1 is connected with No. 7 pin of control chip U1 through series capacitance C5, No. 4 pin and No. 5 pin of control chip U1 all set up through electric capacity C6 ground connection, No. 3 pin ground connection of control chip U1 sets up.
2. The three-phase open-phase and leakage circuit breaker according to claim 1, wherein: the level generating circuit (2) comprises a silicon controlled SCR1, a silicon controlled SCR2, a release L1, a diode D7, a resistor R7, a capacitor C7 and a capacitor C7, wherein one end of the release L7 is connected in series with an anode A of the silicon controlled SCR 7, an anode A of the silicon controlled SCR 7 is connected in series with an anode of the diode D7, the diode D7 is connected in parallel with the release L7, the anode A of the silicon controlled SCR 7 is connected to the ground through the resistor R7 and the resistor R7 which are sequentially connected in series, a control electrode G of the silicon controlled SCR 7 is connected in series with a cathode of the diode D7, a cathode K of the silicon controlled SCR 7 is connected with a cathode of the diode D7 through the series capacitor C7, a cathode K of the silicon controlled SCR 7 is connected in series with the anode A of the silicon controlled SCR 7, one end of the resistor R7 connected with the resistor R7 is connected in series with the anode A of the silicon controlled SCR 7, the silicon controlled SCR 7 is connected in series with the anode of the diode D, the control electrode G of the SCR2 is grounded through a series capacitor C2.
3. The three-phase open-phase and leakage circuit breaker according to claim 2, wherein: the cathode of the diode D7 is connected in series with the cathode of the diode D2, the cathode of the diode D4 and the cathode of the diode D6, the anode of the diode D2 is connected in series with the cathode of the diode D1, the anode of the diode D4 is connected in series with the cathode of the diode D3, the anode of the diode D6 is connected in series with the cathode of the diode D5, the anode of the diode D2, the anode of the diode D4 and the anode of the diode D6 are connected with the phases a, phases B and C of the three-phase power, the anode of the diode D1, the anode of the diode D3 and the anode of the diode D5 are all grounded, and one end of the trip L1 connected with the cathode of the diode D7 is grounded through a series piezoresistor RV 1.
4. A three-phase open-phase and residual-current circuit breaker according to claim 1 or 3, characterized in that: the triode switch circuit (3) comprises a triode Q1, a collector regulator tube Z1, a base regulator tube Z2, a resistor R3, a resistor R4, a resistor R5, a resistor R7, a polar capacitor C7, a polar capacitor C8, a diode D9 and a potentiometer RP1, wherein the collector C of the triode Q1 is connected with the cathode of the diode D7 through a resistor R5 and a resistor R4 which are sequentially connected in series, one end of the resistor R5 connected with the resistor R4 is connected with a No. 8 pin of a control chip U1 in series, a base b of the triode Q1 is connected with the anode of the base regulator tube Z2 in series, the cathode of the base regulator tube Z2 is connected with the anode of the polar capacitor C8 in series, the cathode of the polar capacitor C8 is grounded, the cathode of the base regulator tube Z2 is grounded through the potentiometer RP1, the cathode of the base regulator tube Z2 is connected with the cathode of the diode D7 in series through the resistor R3, and the emitter of the triode Z1 is grounded, a resistor R7 and a polar capacitor C7 are respectively connected in parallel between a collector C and an emitter e of the triode Q1, the cathode of the polar capacitor C7 is grounded, the collector C of the triode Q1 is connected in series with the cathode of a collector voltage-regulator tube Z1, the anode of the collector voltage-regulator tube Z1 is connected in series with the anode of a diode D9, and the cathode of the diode D9 is connected with a No. 4 pin of a control chip U1.
5. The three-phase open-phase and leakage circuit breaker according to claim 1, wherein: the three-phase power is 380V and 50HZ alternating current.
6. The three-phase open-phase and leakage circuit breaker according to claim 1, wherein: the control chip U1 is internally integrated with a voltage stabilizer, a differential amplifier and a latch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021139313.2U CN212010886U (en) | 2020-06-18 | 2020-06-18 | Three-phase open-phase protection and leakage circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021139313.2U CN212010886U (en) | 2020-06-18 | 2020-06-18 | Three-phase open-phase protection and leakage circuit breaker |
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| CN212010886U true CN212010886U (en) | 2020-11-24 |
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| CN202021139313.2U Active CN212010886U (en) | 2020-06-18 | 2020-06-18 | Three-phase open-phase protection and leakage circuit breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865015A (en) * | 2021-03-25 | 2021-05-28 | 浙江深华颖智能科技有限公司 | Sensor with high-voltage zero-sequence protection and measurement functions |
| CN114675093A (en) * | 2022-04-13 | 2022-06-28 | 北京合康新能变频技术有限公司 | Open-phase detection circuit and high-voltage frequency converter of three-phase power supply |
-
2020
- 2020-06-18 CN CN202021139313.2U patent/CN212010886U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865015A (en) * | 2021-03-25 | 2021-05-28 | 浙江深华颖智能科技有限公司 | Sensor with high-voltage zero-sequence protection and measurement functions |
| CN114675093A (en) * | 2022-04-13 | 2022-06-28 | 北京合康新能变频技术有限公司 | Open-phase detection circuit and high-voltage frequency converter of three-phase power supply |
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