CN2430691Y - High voltage and super high voltage photoelectric isolated current mutual inductor - Google Patents
High voltage and super high voltage photoelectric isolated current mutual inductor Download PDFInfo
- Publication number
- CN2430691Y CN2430691Y CN 00233707 CN00233707U CN2430691Y CN 2430691 Y CN2430691 Y CN 2430691Y CN 00233707 CN00233707 CN 00233707 CN 00233707 U CN00233707 U CN 00233707U CN 2430691 Y CN2430691 Y CN 2430691Y
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- high voltage
- mutual inductor
- current
- circuit
- infrared
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- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model relates to a high voltage and super high voltage photoelectric isolated current mutual inductor, which is composed of a current measuring unit of each phase; each measuring unit comprises a self-powered and current sampling circuit, a circuit measuring device and an infrared communication unit. Due to the adoption of the infrared isolated power supply, the mutual inductor and a high voltage bus bar are positioned at the same electric potential, thereby, reducing the requirement of withstanding the voltage and being convenient for manufacturing and installing; the adoption of digital measurement improves measuring precision; the use of the mutual inductor both provides a measurement signal and supplies the power to a testing power; the device still adopts two-way infrared communication, through specifying a communication protocol between a three-phase current measuring unit and a supervisory computer, ensuring the reliability of communication.
Description
The utility model relates to the photoelectric-isolated current transformer that a kind of power supply, distribution system are used.
Traditional AC current transformer, because there are great potential difference (PD) (11KV-330KV) in measured place and demonstration place, so high to the requirement of withstand voltage of current transformer, the manufacturing process complexity costs an arm and a leg, and the installation requirement strictness.
But the purpose of this utility model is to provide a kind of novel self-powered, and high high pressure and the UHV (ultra-high voltage) photoelectric-isolated current transformer of precision.
The utility model is made up of the current measuring unit of every phase; It is characterized in that:
Each measuring unit comprises self-powered and current measuring device and infrared communication unit; Described self-powered comprise the bus-bar mutual inductor, with the ring structure iron core T of bus-bar mutual inductor
1The bridge commutating circuit B that is connected
1, bridge commutating circuit B
1The sampling resistor R of output terminal serial connection
1With voltage stabilizing diode Z
1Current measuring device comprises and above-mentioned voltage stabilizing diode Z
1The voltage amplifier circuit that is connected, the serial analog-digital converter circuit U that is connected with the voltage amplifier circuit output terminal
2, receive and handle the single-chip microcomputer U of current signal
3Described single-chip microcomputer U
3Peripheral circuit has comprised that power supply monitors and the chip U of watchdog function
4With the infrared communication unit; Described infrared communication unit and single-chip microcomputer U
3Signal output, input end link to each other respectively, comprise infrared transmitter L
1With infrared remote receiver H
1
The utility model is compared with the conventional high-tension current transformer, has following advantage:
1. mutual inductor and high pressure bus-bar are in same potential, thereby have reduced requirement of withstand voltage, are convenient to make and install;
2. adopt two-way infrared communication,, guaranteed the reliability of communication by the communications protocol between regulation three-phase current measuring unit and the host computer;
3. utilize mutual inductor that measuring-signal both was provided, power to testing power supply again;
4. the employing digital measurement has improved measuring accuracy greatly;
5. cost reduces greatly.
The drawing explanation:
Fig. 1 is the current sample and the power supply the principle figure of high pressure described in the utility model and UHV (ultra-high voltage) photoelectric-isolated current transformer;
Fig. 2 is the amplification and the A/D conversion schematic diagram of high pressure described in the utility model and UHV (ultra-high voltage) photoelectric-isolated current transformer;
Fig. 3 is the CPU of high pressure described in the utility model and UHV (ultra-high voltage) photoelectric-isolated current transformer and infrared transmission, receive schematic diagram;
Fig. 4 is the host computer schematic diagram of high pressure described in the utility model and UHV (ultra-high voltage) photoelectric-isolated current transformer.
Circuit structure of the present utility model and principle of work are as follows:
Current transformer T among Fig. 1
1Induced current flow over-sampling resistance R
1, through the voltage stabilizing diode voltage stabilizing, for measuring single-chip microcomputer work, C
1, C
3Be filter capacitor.By R as can be known among the figure
1Flow through whole electric currents of induction, reacted the actual current that flows through bus-bar really.The voltage at mutual inductor two ends is B
1Pressure drop add R * I and add voltage stabilizing diode Z
1On pressure drop.The design of the number of turns of mutual inductor will consider to measure initial working current, rated current and the protective current (be generally rated current 2.5 times) of singlechip CPU, will consider electric bridge B simultaneously
1, voltage stabilizing diode Z
1Power dissipation.Example: the initial working current as single-chip microcomputer is 10mA, and rated current is 630A, and protective current is 1600A, system works when bus-bar flows through 20A, and then wire circle is: the 20A/10mA=2000 circle; Rated current is: I=630A/2000=0.315A; The voltage at mutual inductor two ends: V=1.3+R
1I+5.5=7.5V; Rated power: W=IV=2.24 watt; Consider that (7.1 watts) are unsaturated when protective current, the size of iron core just can be selected.Sampling resistor R
1Resistance size, the voltage that should make 2 of A among Fig. 2, B are within 5V, to guarantee operational amplifier U
1Operate as normal.Suitably select R among Fig. 2
12And R
6Resistance, make U
113Output 7 be 1.7V.During protective current 5.25V.10 bits serial A/D reads aanalogvoltage among the CPU, after computing, by infrared emission receiver and upper machine communication, shows.This device three-phase current measuring unit can be communicated by letter with a host computer display unit (as shown in Figure 4), for guaranteeing the reliability of communication, by the whole communication process of PC control, every phase all has the address of oneself, the order that host computer sends comprises address field and command field, after every phase measuring unit analysis order, be the address of oneself, then carry out corresponding command action.
Claims (1)
- A kind of high pressure and UHV (ultra-high voltage) photoelectric-isolated current transformer are made up of the current measuring unit of every phase; It is characterized in that:Each measuring unit comprises self-powered and current measuring device and infrared communication unit; Described self-powered comprise the bus-bar mutual inductor, with the ring structure iron core T of bus-bar mutual inductor 1The bridge commutating circuit B that is connected 1, bridge commutating circuit B 1The sampling resistor R of output terminal serial connection 1With voltage stabilizing diode Z 1Current measuring device comprises and above-mentioned voltage stabilizing diode Z 1The voltage amplifier circuit that is connected, the serial analog-digital converter circuit U that is connected with the voltage amplifier circuit output terminal 2, receive and handle the single-chip microcomputer U of current signal 3Described single-chip microcomputer U 3Peripheral circuit has comprised that power supply monitors and the chip U of watchdog function 4With the infrared communication unit; Described infrared communication unit and single-chip microcomputer U 3Signal output, input end link to each other respectively, comprise infrared transmitter L 1With infrared remote receiver H 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00233707 CN2430691Y (en) | 2000-05-12 | 2000-05-12 | High voltage and super high voltage photoelectric isolated current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00233707 CN2430691Y (en) | 2000-05-12 | 2000-05-12 | High voltage and super high voltage photoelectric isolated current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2430691Y true CN2430691Y (en) | 2001-05-16 |
Family
ID=33595993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00233707 Expired - Fee Related CN2430691Y (en) | 2000-05-12 | 2000-05-12 | High voltage and super high voltage photoelectric isolated current mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2430691Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526258B (en) * | 2009-03-26 | 2011-06-22 | 宁波海诚电器有限公司 | Communication circuit of central air conditioner |
| CN101728076B (en) * | 2010-01-13 | 2011-11-16 | 武汉本杰明自动化设备工程有限公司 | Micropower infrared-communication current transformer |
| WO2014194779A1 (en) * | 2013-06-03 | 2014-12-11 | 国家电网公司 | Measurement device for full-shielding high-voltage current |
| CN105068033A (en) * | 2015-07-15 | 2015-11-18 | 国家电网公司 | Verification device for photoelectric current transformer and method thereof |
-
2000
- 2000-05-12 CN CN 00233707 patent/CN2430691Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101526258B (en) * | 2009-03-26 | 2011-06-22 | 宁波海诚电器有限公司 | Communication circuit of central air conditioner |
| CN101728076B (en) * | 2010-01-13 | 2011-11-16 | 武汉本杰明自动化设备工程有限公司 | Micropower infrared-communication current transformer |
| WO2014194779A1 (en) * | 2013-06-03 | 2014-12-11 | 国家电网公司 | Measurement device for full-shielding high-voltage current |
| CN105068033A (en) * | 2015-07-15 | 2015-11-18 | 国家电网公司 | Verification device for photoelectric current transformer and method thereof |
| CN105068033B (en) * | 2015-07-15 | 2017-12-15 | 国家电网公司 | The calibration equipment and its method of a kind of The Rogowski Optical Current Transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |