CN2493940Y - Voltage-lose current cut off tester - Google Patents

Voltage-lose current cut off tester Download PDF

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CN2493940Y
CN2493940Y CN 01239647 CN01239647U CN2493940Y CN 2493940 Y CN2493940 Y CN 2493940Y CN 01239647 CN01239647 CN 01239647 CN 01239647 U CN01239647 U CN 01239647U CN 2493940 Y CN2493940 Y CN 2493940Y
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circuit
current
voltage
loss
current sampling
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CN 01239647
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吕治安
吴涛
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吕治安
吴涛
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Abstract

The utility model relates to a voltage-lose current cut off tester for detecting the abnormal of electric current and voltage in the three phase three wire electrical energy quantifier. The utility model mainly resolves the problem that voltage-lose current cut off tester can not detect the shunt of the electric current which comprises a microprocessor, a voltage-lose testing circuit, a current cut off testing circuit, a voltage-lose current cut off signal display circuit, a record circuit, a clock circuit, a communication interface circuit and a key input circuit, which is characterized in still including three current sampling circuit, three waveform convert circuit, a time test circuit and a current cut off signal display circuit. The utility model can not only detect the situation of no voltage and current in the computation circuit, but also can detect the situation of shunt of the electric current in the computation circuit.

Description

失压断流失流计时仪 Loss of pressure off the loss of flow chronograph

本实用新型涉及一种三相三线电能计量中检测计量回路电压、电流异常状况的仪表,特别是一种能够检测到计量回路中发生无电压、无电流、电流被分流状况的多功能检测仪表。 The present invention relates to a three-phase three-line power measurement circuit detects the voltage measurement, the current meter abnormal conditions, in particular, capable of detecting the measurement voltage generating circuit, no, no current, the current is shunted condition multifunction instrumentation.

三相电能计量中,一般将电压信号和电流信号输入到电能表中,若进入电能表的电压、电流不正常,如无电压、无电流或电流被分流等,均会影响计量的准确性,造成电量的漏记或少记。 Measurement of three-phase power, and generally a voltage signal to the power current signal input table, if the voltage of the power into the meter, the current is not normal, if no voltage, current, or no current is shunted and the like, will affect the accuracy of measurement, resulting in less leakage power of mind in mind. 为了提高电能表计量的准确性,人们设计出一种失压断流计时仪,它由微处理器、失压检测电路、断流检测电路、失压断流信号显示电路、记录电路、时钟电路、通讯接口电路和按键输入电路构成,能够检测出计量回路中无电压和无电流的状况,并能够记录、显示和通讯传输。 In order to improve the accuracy of metering of electric energy, people stop loss of pressure design a timing device, which consists of a microprocessor, a loss of pressure detecting circuit, a detection circuit interrupter, stop loss of pressure signal display circuit and the recording circuit, a clock circuit , communication interface circuit and a key input circuit, the measurement circuit can be detected no voltage and current conditions, and be able to record, display and communication transmission. 失压断流计时仪中由于未设有失流检测电路,因而不能检测计量回路中电流被分流的状况,其不足之处是不能检测到计量回路中电流被分流的情况。 Stop loss of pressure due to the timing device stall detection circuit is not provided, and therefore can not detect a current metering circuit is shunted condition, its deficiency is not detected that the metering circuit current is shunted.

本实用新型的目的就是针对上述不足之处而提供一种既能够检测计量回路中无电压、无电流状况,又能够检测计量回路中电流被分流状况的失压断流失流计时仪。 The object of the present invention is for the above-described disadvantages and to provide a measurement circuit capable of detecting either no voltage, no current status, and is capable of detecting a current metering circuit is shunted off condition of loss of pressure loss of the flow chronometer.

本实用新型的技术解决方案是:一种失压断流失流计时仪,包括微处理器及与其连接的失压检测电路、断流检测电路、失压断流信号显示电路、记录电路、时钟电路、通讯接口电路和按键输入电路,其特征是:所述的断流检测电路还包括三个与计量回路连接的电流取样电路,其中两个电流取样电路分别与计量回路的两个电流支路连接,另一个电流取样电路同时与该计量回路的两个电流支路连接。 The present invention technical solution is: A loss of pressure loss of the flow-off timing device, comprising a microprocessor and a loss of voltage detection circuit connected thereto, the disconnection detecting circuit, display circuit stop loss of pressure signal, a recording circuit, a clock circuit , communication interface circuit and a key input circuit, characterized in that: said circuit interrupter further includes a current detecting three sampling circuit connected to the metering circuit, two current branches, respectively, wherein the two current sampling circuit is connected to the metering circuit , two current branches simultaneously another current loop sampling circuit is connected with the metering. 该三个电流取样电路输出分别与三个波形变换电路连接。 The three current sampling circuit are connected to the three output waveform conversion circuit. 该三个波形变换电路经测时电路与微处理器连接。 When the circuit is connected to the microprocessor via the three measured waveform conversion circuit. 所述的失压断流信号显示电路中还包括失流信号显示电路。 Stop loss of pressure signal said display circuit further comprises a stall signal display circuit.

本实用新型技术解决方案中所述的计量回路的两个电流支路可以分别通过两个电流取样电路,再电连接后通过另一个电流取样电路。 Technical Solution The present invention in the two current branches metering loop by two current sampling circuits, respectively, and then electrically connecting through another current sampling circuit.

本实用新型技术解决方案中所述的计量回路的两个电流支路还可以分别通过两个电流取样电路,再共同穿过另一个由互感器构成的电流取样电路。 Technical Solution The present invention in the two current branches of the loop may also be metered by two current sampling circuits, respectively, and then together through a current sampling circuit of another configuration of the transformer.

本实用新型由于在断流检测电路中增设了三个电流取样电路,三个波形变换电路、测时电路,在失压断流信号显示电路中增设了失流信号显示电路,其中,两个电流取样电路分别与计量回路的两个电流支路连接,另一个电流取样电路同时与该计量回路的两个电流支路连接,因而,当计量回路中的任一电流支路出现电流被分流时,均导致电流向量之间的相位角偏离正常,经电流取样电路、波形变换电路、测时电路和微处理器可将该偏离正常的相位角准确测量出来,再由微处理器判断出有分流发生,并实时记录、显示。 Since the present invention is the addition of three current sampling circuit interrupter detection circuit, three waveform conversion circuit, when the sensing circuit, the loss of pressure signal display circuit interrupter added a stall signal display circuit, two currents sampling circuit connected to the two current branches metering circuit, while another current sampling circuit is connected to the two branches of the current metering circuit, therefore, when any one of a current metering circuit is shunted current branch occurs, all contribute to the phase angle between the current vector deviates from the normal, the current sampling circuit, the waveform conversion circuit, when the sensing circuit and a microprocessor may be deviated from the normal phase angle accurately measured, then the microprocessor determines that the shunt occurred and real-time recording, display. 与现有技术相比,本实用新型除能够检测出计量回路中无电压、无电流的状况外,还能够检测出计量回路中电流被分流的状况,因而达到了本实用新型的目的。 Compared with the prior art, the present invention can be detected in addition no voltage measurement circuit, no current external situation is also possible to detect the current metering circuit is shunted condition, thereby achieving the object of the present invention.

附图的图面说明如下:图1是三相三线计量回路分流情况示意图;图2是图1中无分流时的电流向量图;图3是图1中A相出现分流时的电流向量图;图4是图1中C相出现分流时的电流向量图;图5是图1中A、C相均出现分流时的电流向量图;图6是本实用新型的电路方框图;图7是图6中无分流时的电流波形图;图8是本实用新型实施例的部分电路图;图9是本实用新型实施例的部分电路图。 Brief Description of drawings: Figure 1 is a schematic view of a three-phase three-wire measurement shunt circuit case; FIG. 2 is a view when no shunt current vector; FIG. 3 is a view of the current vector A with a shunt occurs; FIG 4 is a current vector diagram of FIG. 1 C phase occurs shunt; FIG. 5 is a view in a 1, C phases are current vector diagram when a shunt occurs; FIG. 6 is a block diagram of the present invention circuit; FIG. 7 is a diagram 6 current waveform when no shunt; FIG. 8 is a partial circuit diagram of an embodiment of the present invention; FIG. 9 is a partial circuit diagram of an embodiment of the present invention.

下面结合附图对本实用新型作进一步详述:如图1所示,A和C相电流Ia、Ic进入电能表4,流出电能表4后汇接在一起组成回路,合成电流为-Ib。 As shown, A, and C-phase currents Ia, Ic 4 into the meter 1, the power flowing in Table 4 together to form tandem loops, synthetic current -Ib: DRAWINGS The present invention will be further described in detail below in conjunction. 三根虚线1、2、3分别为实际使用中可能会出现的三种分流情况,其中,虚线1是将A相电流分流,虚线2是将C相电流分流,虚线3是将A、C相电流均分流。 Three broken lines 1,2,3 split into three cases may occur in actual use, wherein the dotted line is a phase A current shunt, a broken line 2 is the C-phase current shunt, a dashed line 3 is A, C-phase current were split. 在正常情况下,电流Ia、Ic、-Ib的向量如图2所示,其之间的相位角均为120°,考虑到系统工作时会略有不平衡,其角度会稍有变化,但变化很小。 Under normal conditions, the vector current Ia, Ic, -Ib shown in Figure 2, which are the phase angle between 120 °, there will be slight imbalances when considering the system operation, which angle is slightly changed, but Little change. 当出现虚线1所示的分流时,会使流入电能表4的A相电流减小,电流-Ib的向量会向Ic发生偏移,从而使角度Φ1增大,大于60°;Φ2减小,小于60°,如图3所示。 When the shunt shown in broken line occurs, causes the phase A current flows into the energy meter 4 is reduced, the current vector -Ib shifted to Ic occurs, thereby increasing the angle Φ1, greater than 60 °; Φ2 reduced, less than 60 °, as shown in FIG. 同理,当出现虚线2所示的分流时,会使角度Φ2增大,大于60°,Φ1减小,小于60°,如图4所示。 Similarly, when the shunt shown in a broken line occurs, will increase the angle Φ2, greater than 60 °, reduced Phi] l, less than 60 °, as shown in FIG. 若出现虚线3所示的分流时,则会使角度Φ1、Φ2均减个,小于60°,此时流入电能表4的电流Ia、Ic之间的相位角会小于120°,如图5所示。 If the broken line 3 shown split occurs, then make an angle Φ1, Φ2 are a reduction of less than 60 °, this time the current flowing into the energy meter Ia 4, the phase angle between the Ic will be less than 120 °, as shown in FIG 5 shows.

本实用新型电路方框图如图6所示。 The present invention is a circuit block diagram shown in Fig. 电流取样电路5、6、7,波形变换电路8、9、10,测时电路11均为常规电路。 Current sampling circuit 5,6,7, 8,9,10 waveform conversion circuit, when the sensing circuit 11 are conventional circuits. 电流Ia、Ic经电流取样电路5、6、7分别取样后,再由波形变换电路8、9、10分别将其变换为方波,将这些方波信号送入测时电路11,测量出波形之间的时间差,从而得出相位角Φ1和Φ2,再由微处理器12根据一事先设定的阀值进行比较,从而判断出是否有分流发生。 Currents Ia, Ic, a current sampling circuit after each sampling 5,6,7, 8,9, 10 and then by the waveform converting circuit converts each square wave, these square-wave signals fed to the sensing circuit 11, a waveform measured the difference between the time to arrive at the phase angle Φ1 and [Phi] 2, and then compared by the microprocessor 12 in accordance with a preset threshold, to determine whether there is a shunt occurs. 正常时电流Ia、Ic和-Ib的波形图如图7所示。 Normal currents Ia, Ic and -Ib waveform diagram is shown in Fig. 测时电路也可使用单片微处理机中的定时器完成。 When the sensing circuit may also be used in the completion of the timer chip microprocessor. 失压检测电路13、断流检测电路14、15、时钟电路16、记录电路17、通讯接口电路19、按键输入电路20均与现有技术失压断流计时仪中的相同。 Loss of voltage detection circuit 13, the interrupter detection circuits 14 and 15, a clock circuit 16, records 17, 19, communication interface circuit are the same as the key input circuit 20 and the prior art circuit interrupter loss of pressure in the timing device. 当有任一电压VA或VB或VC低于一设定的阀值时,失压检测电路13即可分别产生一个有效的信号,送入微处理器12中,由微处理器进行处理。 When there is any voltage VA or VB or VC is lower than a set threshold, voltage detecting circuit 13 can generate a valid signal, respectively, into the microprocessor 12, it is processed by the microprocessor. 当计量回路中的电流为零时,断流检测电路14、15便会输出一有效的信号到微处理器12。 When the current measurement circuit is zero, the detection circuit interrupters 14 and 15 will output a valid signal to the microprocessor 12. 微处理器12的软件能够分析并区分出系统停电或负荷为零的正常情况。 The microprocessor 12 software can analyze and distinguish the normal power system or a load is zero. 时钟电路16可产生正确的日历和时钟,以使微处理器12能够记录下发生上述各种异常情况的日期和时间。 The clock circuit 16 can generate the correct calendar and clock, to allow the microprocessor 12 to record the date and time of occurrence of the above abnormal conditions. 记录电路17用于记录各种数据。 Recording circuit 17 for recording various kinds of data. 通讯接口电路19用于与其它计算机进行数据通信,以组成实时的监控系统,通信协议符合有关标准。 Communication interface circuit 19 for data communication with other computers, to monitor real-time system components, the communication protocol to meet the standards. 按键输入电路20可对仪表的日期和时间进行校正和设定,也可用按键并通过显示器读取仪表内记录的各种数据,还可使用按键将仪表内的数据清零。 Key input circuit 20 can be corrected and the date and time setting of the instrument, and the keys can also be used within the display data read by various instruments recorded data may be used to key in the meter is cleared. 失压断流信号显示电路18为现有技术电路,但增设有失流信号显示电路,可用数码管显示日期和时间,用LRD显示系统是否有失压、断流或失流的发生,以及发生的相别。 Stop loss of pressure signal display circuit 18 as the prior art circuit, but beneath the additional stream signal display circuit, the available digital display date and time, whether the system displays any errors occurring pressure loss of flow with a cutout or LRD, and the occurrence of the phase difference. 本实用新型在安装时即可安装在互感器与电能表之间,也可安装在电能表以后。 When the present invention is mounted can be installed between the transformer and the power meter can also be installed later in the meter.

本实用新型电路中计量回路的两个电流支路分别通过两个电流取样电路5、6,再电连接后通过另一个电流取样电路7。 Two current branches in the present invention the circuit loops are metered by two current sampling circuits 5 and 6, and then electrically connecting the current sampling circuit 7 through another.

本实用新型实施例如图8、图9所示。 Embodiment of the present invention as shown in FIG. 8, FIG. 9. 三个电流取样电路均由小型电流互感器H1、H2、H3构成,为常规电路。 Three current sampling circuit by a small current transformer H1, H2, H3 configuration, a conventional circuit. 三个LM339比较器构成三个波形变换电路,为常规电路。 LM339 comparator constituting the three three waveform converting circuit is a conventional circuit. 两个7404非门电路、两个7400与门电路和89C51单片机内部的定时器T0和T1构成测时电路。 Two NAND circuits 7404, and 7400 and two internal timers of the 89C51 microcontroller gates T0 and T1 constituting the timekeeping circuit. 计量回路的两个支路分别穿过H1和H2,再共同穿过H3,即电流Ia和Ic通过磁合成在H3次级形成电流-Ib。 Two branches pass through the metering circuits H1 and H2, and then together through H3, i.e. current Ia and the current Ic is formed by the secondary magnetic H3 -Ib in synthesis. H1、H2和H3次级的电流信号送入LM339比较器分别将其转换为方波信号。 H1, H2 and H3 secondary current signal into the comparator LM339 respectively converted to a square wave signal. 为了利用89C51单片机内部的定时器T0和T1来测量Φ1、Φ2的宽度,将这三个信号经7404、7400门电路等变换为Φ1和Φ2,并将反映Φ1和Φ2的信号分别连接至89C51单片机的INT0和INT1引脚,工作时将89C51单片机内部的T0和T1设定为门控工作方式,INT0和INT1设为下降沿中断,这样在Φ1和Φ2为高电平期间,T0、T1进行计时,Φ1、Φ2变低后停止计时,同进向CPU发出中断申请,CPU进入中断服务程序后读取T0、T1的计数值,即为Φ1、Φ2的宽度。 To use the internal timers T0 and T1 89C51 microcontroller to measure the width Φ1, Φ2, and these three signals are converted to other gates 7404,7400 Phi] l and [Phi] 2, [Phi] 2 and the reflected signal Phi] l and are connected to the 89C51 microcontroller the INT0 and INT1 pin, the inside of the work 89C51 microcontroller T0 and T1 is set to a gated mode of operation, to INT0 and INT1 falling edge interrupt, such as a high level period, T0, T1 in the Φ1 and Φ2 timed , Phi] l, [Phi] 2 goes low after the timer is stopped, with the issue an interrupt request to the CPU into, the CPU enters the interrupt service routine reads T0, the count value T1, namely the width Φ1, Φ2 is.

断流检测电路包括两组由二极管D1、D2、电容C1、C2、电阻R1、R2构成的整流电路,为现有技术电路。 Detecting interrupter circuit comprises two diode D1, D2, capacitors C1, C2, resistors R1, R2 form a rectification circuit, the prior art circuit. IN4148二极管D1、D2、电容器C1、C2、电阻R1、R2分别把A相电流和C相电流的波形变换为直流。 IN4148 diodes D1, D2, capacitors C1, C2, resistors R1, R2 respectively, the A-phase current and the C phase current waveform is converted into direct current. 若Ia或Ic中有电流,则其相应的波形通过二极管周期性地分别向C1、C2充电,使之维持高电平;发生断流时,波形消失,电容两端电压为零,将C1、C2的电压信号直接连接到89C51单片机的P1.2和P1.3、引脚。 If the current Ia or Ic, its corresponding waveform by charging each diode to periodically C1, C2, so as to maintain high; disconnection occur, the disappearance of the voltage across the capacitor is zero, the C1, C2 is directly connected to the voltage signal on 89C51 P1.2 and P1.3, pins.

失压检测电路为已有技术电路。 Loss of voltage detection circuit is a prior art circuit. 该电路由稳压二极管D3、D4、D5、二极管D6、D7、D8和光电耦合器G1、G2、G3组成。 The circuit consists of Zener diode D3, D4, D5, diode D6, D7, D8 and a photocoupler G1, G2, G3 composition. 稳压二极管的稳压值决定失压检测的阈值,电阻R3、R4、和R5起限流作用,二极管D6、D7、D8起反向隔离作用,光电耦合器起光电耦合作用。 The Zener voltage of the diode detector determines the threshold of loss of pressure, the resistor R3, R4, R5 and limiting the role play, diodes D6, D7, D8 from the reverse isolation, optocouplers role played photocoupler. 当Va、Vb、Vc某一相电压低于阈值时,相应的稳压二极管便不能导通,从而使相应的光电耦合器输出为高电平,例如Va低于阈值,则G1、G2均输出为高电平,而G3输出为低电平。 When Va, Vb, Vc when the phase voltage is lower than a certain threshold value, the corresponding zener diode can not be turned on, so that the corresponding optocoupler output is high, e.g. Va becomes lower than the threshold value, the G1, G2 are output is high, the output G3 is low. G1、G2和G3的输出分别接至89C51单片机的P1.4、P1.5、P1.6引脚。 G1, G2 and G3 are output respectively connected to the 89C51 microcontroller P1.4, P1.5, P1.6 pin. 电容C3、C4、C5起滤波作用。 Capacitors C3, C4, C5 from the filtering effect.

含失流信号显示电路的失压断流信号显示电路为常规电路,由7只与89C51单片机的P0口连接的发光二极管、3只与89C51单片机的P1口连接的74HC595移位寄存器及11只数码管显示器构成。 Stall signal containing stop loss of pressure signal display circuit of the display circuit is a conventional circuit, a light emitting diode 7 is connected to the port P0 and 89C51, three 74HC595 shift register connected to the port P1 of the 89C51 microcontroller 11 and digital tube display configuration. 由P0口驱动7只发光二极管分别指示Va、Vb、Vc失压、Ia、Ic断流和Ia、Ic分流。 7 LED driving the P0 port indicate Va, Vb, Vc loss of pressure, Ia, Ic and disconnection Ia, Ic shunt. 通过P1口的三根引线驱动3只74HC595移位寄存器对11只数码管进行动态扫描,显示日期、时间和记录数据等有关信息。 Pin P1 via three ports drive three 74HC595 shift register 11 of the digital dynamic scanning tube, displays information about the date, time, and data recording.

记录电路采用具有I2C接口的24C256EEPROM芯片构成。 Recording circuit chips having 24C256EEPROM using I2C interface. 时钟电路采用具有I2C接口的P8583实时时钟芯片构成,由89C51单片机直接生成I2C驱动信号对其进行操作。 P8583 clock circuit using a real time clock chips with I2C interface, a 89C51 microcontroller I2C driver signal generated directly manipulate. 通讯接口电路采用MAX1487接口芯片构成。 Interface Communication interface circuit MAX1487 chip. 接键输入电路由5只与89C51单片机的P2口连接的按键构成。 A key input circuit connected to the key port P2 is connected to the 89C51 microcontroller 5.

Claims (3)

1.一种失压断流失流计时仪,包括微处理器(12)及与其连接的失压检测电路(13)、断流检测电路(14、15)、失压断流信号显示电路(15)、记录电路(17)、时钟电路(16)、通讯接口电路(19)和按键输入电路(20),其特征是:所述的断流检测电路(14、15)还包括三个与计量回路连接的电流取样电路(5、6、7),其中两个电流取样电路(5、6)分别与计量回路的两个电流支路(Ia、Ic)连接,另一个电流取样电路(7)同时与该计量回路的两个电流支路(Ia、Ic)连接;该三个电流取样电路(5、6、7)输出分别与三个波形变换电路(8、9、10)连接;该三个波形变换电路(8、9、10)经测时电路(11)与微处理器(12)连接;所述的失压断流信号显示电路(18)中还包括失流信号显示电路。 A loss of pressure loss of the flow-off timing device, comprising a microprocessor (12) and the pressure loss detection circuit (13) connected thereto, a detection circuit interrupter (14, 15), stop loss of pressure signal display circuit (15 ), the recording circuit (17), a clock circuit (16), a communication interface circuit (19) and a key input circuit (20), characterized in that: said detecting circuit interrupter (14, 15) further comprises a metering and three current sampling circuit (5,6,7) connected to the circuit, wherein the two current sampling circuit (5, 6) are respectively connected to the two current branches metering loop (Ia, Ic), another current sampling circuit (7) two current branches simultaneously connected with the metering loop (Ia, Ic); (5,6,7) of the three current output circuits are connected to the three sampling waveform conversion circuit (8,9,10); the three a waveform conversion circuit (8,9,10) over time sensing circuit (11) and a microprocessor (12); said display signal to stop loss of pressure circuit (18) further comprises a stall signal display circuit.
2.根据权利要求1所述的一种失压断流失流计时仪,其特征是:所述的计量回路的两个电路支路(Ia、Ic)分别通过两个电流取样电路(5、6),再电连接后通过另一个电流取样电路(7)。 2. According to one claim out of the press-breaking a loss flow timing device, characterized in that: said two circuit branches metering loop (Ia, Ic), respectively, by two current sampling circuit (5,6 ), and then electrically connecting through another current sampling circuit (7).
3.根据权利要求1所述的一种失压断流失流计时仪,其特征是:所述的计量回路的两个电流支路(Ia、Ic)分别通过两个电流取样电路(H1、H2),再共同穿过另一个由互感器(H3)构成的电流取样电路(H3)。 3. According to one of claim 1 to claim lost pressure loss flow off timing device, characterized in that: two current branches of the measurement loop (Ia, Ic), respectively, by two current sampling circuit (H1, H2 ), and then through the other common current sampling circuit (H3) from the transformer (H3) configuration.
CN 01239647 2001-03-30 2001-03-30 Voltage-lose current cut off tester CN2493940Y (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100427956C (en) 2005-09-27 2008-10-22 陈劲游 Automatically voltage-loss missing electric-energy recording method and its multifunctional electric-energy gauge
CN103441577A (en) * 2013-09-04 2013-12-11 博爱县电业公司 Detection device and system for grid voltage loss and current switch-off

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100427956C (en) 2005-09-27 2008-10-22 陈劲游 Automatically voltage-loss missing electric-energy recording method and its multifunctional electric-energy gauge
CN103441577A (en) * 2013-09-04 2013-12-11 博爱县电业公司 Detection device and system for grid voltage loss and current switch-off

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