CN107643437B - On-line intelligent conversion complex ratio current transformer - Google Patents
On-line intelligent conversion complex ratio current transformer Download PDFInfo
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Abstract
The invention relates to a complex ratio current transformer in an electric energy metering device, in particular to a complex ratio current transformer for online intelligent conversion. The problem that the existing complex ratio current transformer cannot be automatically converted on line is solved. The complex ratio current transformer for online intelligent conversion comprises a complex ratio current transformer body CT, a sampling current transformer CT1, an RMS processing circuit module, an A/D conversion module, an MCU microprocessor with an input port, a control relay JK, a protection relay JB, a large and small ratio common power-off delay relay J2 and a large ratio power-off delay relay J1. The invention can realize the on-line automatic switching of the transformation ratio and has the protection measure for preventing the secondary open circuit; the structure design is reasonable and unique, the problem that the existing complex ratio current transformer cannot be automatically converted on line is solved, and equipment damage and personal injury accidents can be effectively avoided. The invention is suitable for the electric energy metering device.
Description
Technical Field
The invention relates to a complex ratio current transformer in an electric energy metering device, in particular to a complex ratio current transformer for online intelligent conversion.
Background
At present, an electric energy metering device circuit only designs a current transformer with a single transformation ratio or double transformation ratios aiming at rated load electricity utilization, only one transformation ratio current transformer is selected and installed on site at one time, and transformation ratio replacement is forbidden strictly after electrification, because a secondary open circuit has great danger to a power grid. The current transformer transformation ratio needs to be replaced and must be powered off, the replacement of the transformation ratio by a manual secondary short-circuit jumper is very dangerous, and safety regulations are not allowed. The current transformers for electric energy metering are S-level current transformers, generally designed to operate in the range of 20% -120% of transformation ratio rated current, and according to the national common people' S republic of China metrological verification regulations JJG313-2010 current transformer for measuring and JG1021-2007 power transformer, the error limit value of the S-level current transformer in the range is linear and stable, and when the error exceeds the range of 20% -120% of rated current, the transformation ratio error of the current transformer can be increased. Sometimes, the current exceeds the rated current by several times to one hundred times, for example, the seasonal power load of an enterprise in a wind (water) power generation and power utilization period, a heating and non-heating period or a periodic operation period is changed greatly, usually, the variable ratio limit is changed by 5 times to 100 times, which is far beyond the measurable range of a common current transformer, and the metering leakage and the energy waste are caused in a low load or overload state. The two sets of metering systems are added, land space and metering equipment are required to be added, in addition, a contact point is arranged in the middle of a circuit of the external transformation ratio conversion controller, the possibility of electricity stealing is caused, the lead sealing difficulty is increased, the fault point and the operation and maintenance cost are increased, and the current national standard regulation is not met.
At present, some power management departments use a composite double-transformation-ratio current transformer or a multi-transformation-ratio current transformer, and when the composite transformation-ratio current transformer is used for transforming transformation ratio, a series of manual operations such as power failure, rewiring and the like are needed, so that inconvenience and economic loss are brought to power consumers, and a large amount of time and manpower are needed.
Disclosure of Invention
The invention solves the problem that the existing complex ratio current transformer can not be automatically converted on line, and provides an on-line intelligent conversion complex ratio current transformer.
The invention is realized by adopting the following technical scheme: the online intelligent conversion complex ratio current transformer comprises a complex ratio current transformer body CT, a sampling current transformer CT1, an RMS processing circuit module, an A/D conversion module, an MCU microprocessor with a communication interface, a protection relay JB, a control relay JK, a large and small ratio common power-off delay relay J2 and a large ratio power-off delay relay J1; any one secondary winding of the complex ratio current transformer body CT is selected as a metering secondary winding, and the metering secondary winding is provided with a common tap end 1S1, a small-transformation-ratio tap end 1S2 and a large-transformation-ratio tap end 1S 3; the common tap end 1S1 is coupled with the primary winding of the sampling current transformer CT1 and then serves as a polarity end of the metering secondary winding; the small transformation ratio tapping end 1S2 is connected with one end of a normally open contact J2-1 of a large and small transformation ratio common outage delay relay J2, and the other end of the normally open contact J2-1 of the large and small transformation ratio common outage delay relay J2 is used as a common non-polar end 1COM of a metering secondary winding; the large transformation ratio tapping end 1S3 is simultaneously connected with one end of a normally closed contact J2-2 of a large and small transformation ratio common outage delay relay J2, one end of a normally open contact J1-1 of the large transformation ratio outage delay relay J1 and one end of a normally closed contact JB-1 of a protection relay JB, and the other end of a normally closed contact J2-2 of a large and small transformation ratio common outage delay relay J2, the other end of a normally open contact J1-1 of a large transformation ratio outage delay relay J1 and the other end of a normally closed contact JB-1 of the protection relay JB are all connected to a common non-polar end 1 COM; the two ends of a secondary winding of the sampling current transformer CT1 are connected with a sampling resistor R, one end of the sampling resistor R is grounded, the other end of the sampling resistor R is connected with the input of an RMS processing circuit module, the output of the RMS processing circuit module is connected with the input of an A/D conversion module, the output of the A/D conversion module is connected with the input of an MCU microprocessor, the output end of the MCU microprocessor controls the electrification and the power loss of a control relay JK, a normally open contact of the control relay JK is connected in series with a power supply loop of a large-transformation ratio power-off delay relay J2, a normally closed contact of the control relay JK is connected in series with a power supply loop of the large-transformation ratio power-off delay relay J1, and a.
When the device is used, a user can adopt a remote Bluetooth wireless device or other input devices to send a small-transformation-ratio current upper limit set value and a large-transformation-ratio current lower limit set value to the MCU microprocessor through a communication interface, the sampling current transformer CT1 collects the output current of a metering secondary winding of the body CT of the complex-ratio current transformer in real time, the output current is converted into a voltage signal through the sampling resistor R, the voltage signal is processed through the RMS processing circuit module to obtain a voltage signal effective value, the voltage signal effective value is transmitted to the A/D conversion module, the voltage signal effective value is transmitted to the MCU microprocessor after analog-to-digital conversion of the A/D conversion module, and the MCU microprocessor converts the voltage signal effective value into a corresponding current collection value under the support of corresponding software and compares the current collection value with the small-transformation-ratio current upper limit set value and. When the current collection value is smaller than the lower limit set value of the large transformation ratio current, the MCU microprocessor enables the control relay JK to be electrified, the normally closed contact of the control relay JK is opened, the normally open contact of the control relay JK is closed, the large transformation ratio power-off delay relay J1 is powered off in a delayed mode, the large transformation ratio common power-off delay relay J2 is electrified, the normally open contact J2-1 of the control relay JK is closed, the normally open contact J1-1 of the large transformation ratio power-off delay relay J1 is powered off in a delayed mode, and the CT of the body of the complex ratio current transformer is switched from; on the contrary, when the current collection value is larger than the upper limit set value of the small transformation ratio current, the MCU microprocessor enables the control relay JK to lose power, the normally closed contact is closed, the normally open contact is opened, so that a large-transformation-ratio power-off delay relay J1 is electrified, a large-transformation-ratio common power-off delay relay J2 is subjected to time-delay power-off, a normally open contact J1-1 of a large-transformation-ratio power-off delay relay J1 is closed, and a normally open contact J2-1 of a large-transformation-ratio common power-off delay relay J2 is subjected to time-delay power-off (meanwhile, a normally closed contact J2-2 of a large-transformation-ratio common power-off delay relay J2 is subjected to time-delay closing; a normally closed contact J2-2 of a large-transformation-ratio common power-off delay relay J2 ensures that the complex ratio current transformer is stably in a large-transformation-ratio state when being started, secondary open circuit under a starting transient state is prevented, and secondary open circuit under; when the power is cut off accidentally in the state of small transformation ratio, the normally closed contact JB-1 of the protection relay JB immediately switches on the secondary circuit with large transformation ratio, so as to prevent the instant secondary open circuit caused by the power-off delay relay J2 sharing large and small transformation ratios in the process of delaying the power-off.
The complex ratio current transformer capable of realizing online intelligent conversion can realize online automatic switching of the transformation ratio and has a protective measure for preventing secondary open circuit; the structure design is reasonable and unique, the problem that the existing complex ratio current transformer cannot be automatically converted on line is solved, and equipment damage and personal injury accidents can be effectively avoided. The invention is suitable for the electric energy metering device.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The online intelligent conversion complex ratio current transformer comprises a complex ratio current transformer body CT, a sampling current transformer CT1, an RMS processing circuit module, an A/D conversion module, an MCU microprocessor with a communication interface, a protection relay JB, a control relay JK, a large and small ratio common power-off delay relay J2 and a large ratio power-off delay relay J1; any one secondary winding of the complex ratio current transformer body CT is selected as a metering secondary winding, and the metering secondary winding is provided with a common tap end 1S1, a small-transformation-ratio tap end 1S2 and a large-transformation-ratio tap end 1S 3; the common tap end 1S1 is coupled with the primary winding of the sampling current transformer CT1 and then serves as a polarity end of the metering secondary winding; the small transformation ratio tapping end 1S2 is connected with one end of a normally open contact J2-1 of a large and small transformation ratio common outage delay relay J2, and the other end of the normally open contact J2-1 of the large and small transformation ratio common outage delay relay J2 is used as a common non-polar end 1COM of a metering secondary winding; the large transformation ratio tapping end 1S3 is simultaneously connected with one end of a normally closed contact J2-2 of a large and small transformation ratio common outage delay relay J2, one end of a normally open contact J1-1 of the large transformation ratio outage delay relay J1 and one end of a normally closed contact JB-1 of a protection relay JB, and the other end of a normally closed contact J2-2 of a large and small transformation ratio common outage delay relay J2, the other end of a normally open contact J1-1 of a large transformation ratio outage delay relay J1 and the other end of a normally closed contact JB-1 of the protection relay JB are all connected to a common non-polar end 1 COM; the two ends of a secondary winding of the sampling current transformer CT1 are connected with a sampling resistor R, one end of the sampling resistor R is grounded, the other end of the sampling resistor R is connected with the input of an RMS processing circuit module, the output of the RMS processing circuit module is connected with the input of an A/D conversion module, the output of the A/D conversion module is connected with the input of an MCU microprocessor, the output end of the MCU microprocessor controls the electrification and the power loss of a control relay JK, a normally open contact of the control relay JK is connected in series with a power supply loop of a large-transformation ratio power-off delay relay J2, a normally closed contact of the control relay JK is connected in series with a power supply loop of the large-transformation ratio power-off delay relay J1, and a.
In specific implementation, a small-transformation-ratio indicator lamp M1 is connected in parallel with two ends of a large-transformation-ratio power-off delay relay J2 shared by large and small transformation ratios, and a large-transformation-ratio indicator lamp M2 is connected in parallel with two ends of a large-transformation-ratio power-off delay relay J1 shared by the large and small transformation ratios; the large-transformation-ratio power-off delay relay J1 and the large-transformation-ratio power-off delay relay J2 are adopted to prevent secondary open circuit in the switching process and increase the smooth transition of switching between large transformation ratio and small transformation ratio. The communication interface of the MCU microprocessor is an RS232 interface or a Bluetooth interface.
Other secondary windings of the composite transformation ratio current transformer body CT also have a common tap end 2S1, a small transformation ratio tap end 2S2 and a large transformation ratio tap end 2S3, each other secondary winding corresponds to a large and small transformation ratio shared outage delay relay J4 and a large transformation ratio outage delay relay J3 respectively, the small transformation ratio tap end 2S2 of the secondary winding (namely each other secondary winding) is connected with one end of a normally open contact J4-1 of the large and small transformation ratio shared outage delay relay J4 corresponding to the secondary winding, and the other end of the normally open contact J4-1 of the large and small transformation ratio shared outage delay relay J4 corresponding to the secondary winding is used as a common non-polar end 2COM of the secondary winding; the large transformation ratio tapping end 2S3 of the secondary winding is simultaneously connected with one end of a normally closed contact J4-2 of a large transformation ratio common outage delay relay J4 corresponding to the secondary winding, one end of a normally open contact J3-1 of the large transformation ratio outage delay relay J3 corresponding to the secondary winding and one end of one JB-2 of other normally closed contacts of a protection relay JB, and the other end of the normally closed contact J4-2 of the large transformation ratio common outage delay relay J4 corresponding to the secondary winding, the other end of the normally open contact J3-1 of the large transformation ratio outage delay relay J3 corresponding to the secondary winding and the other end of one JB-2 of the other normally closed contacts of the protection relay JB are all connected to the common non-polar end 2COM of the secondary winding; the large-transformation-ratio power-off shared relay J4 corresponding to other secondary windings and the large-transformation-ratio power-off shared relay J2 corresponding to the metering secondary winding are connected in parallel, and the large-transformation-ratio power-off relay J3 corresponding to other secondary windings and the large-transformation-ratio power-off relay J1 corresponding to the metering secondary winding are connected in parallel; thus, the other secondary windings can realize the switching of the large and small transformation ratio states simultaneously with the metering secondary winding connected with the sampling current transformer CT 1.
Claims (3)
1. A complex ratio current transformer for online intelligent conversion is characterized by comprising a complex ratio current transformer body CT, a sampling current transformer CT1, an RMS processing circuit module, an A/D conversion module, an MCU microprocessor with a communication interface, a protection relay JB, a control relay JK, a large and small ratio common power-off delay relay J2 and a large ratio power-off delay relay J1; any one secondary winding of the complex ratio current transformer body CT is selected as a metering secondary winding, and the metering secondary winding is provided with a common tap end 1S1, a small-transformation-ratio tap end 1S2 and a large-transformation-ratio tap end 1S 3; the common tap end 1S1 is coupled with the primary winding of the sampling current transformer CT1 and then serves as a polarity end of the metering secondary winding; the small transformation ratio tapping end 1S2 is connected with one end of a normally open contact J2-1 of a large and small transformation ratio common outage delay relay J2, and the other end of the normally open contact J2-1 of the large and small transformation ratio common outage delay relay J2 is used as a common non-polar end 1COM of a metering secondary winding; the large transformation ratio tapping end 1S3 is simultaneously connected with one end of a normally closed contact J2-2 of a large and small transformation ratio common outage delay relay J2, one end of a normally open contact J1-1 of the large transformation ratio outage delay relay J1 and one end of a normally closed contact JB-1 of a protection relay JB, and the other end of a normally closed contact J2-2 of a large and small transformation ratio common outage delay relay J2, the other end of a normally open contact J1-1 of a large transformation ratio outage delay relay J1 and the other end of a normally closed contact JB-1 of the protection relay JB are all connected to a common non-polar end 1 COM; two ends of a secondary winding of the sampling current transformer CT1 are connected with a sampling resistor R, one end of the sampling resistor R is grounded, the other end of the sampling resistor R is connected with the input of an RMS processing circuit module, the output of the RMS processing circuit module is connected with the input of an A/D conversion module, the output of the A/D conversion module is connected with the input of an MCU microprocessor, the output end of the MCU microprocessor controls the electrification and the power loss of a control relay JK, a normally open contact of the control relay JK is connected in series with a power supply loop of a large-transformation ratio power-off delay relay J2, a normally closed contact of the control relay JK is connected in series with a power supply loop of the large-transformation ratio power-off delay relay J1, and a protection; the communication interface of the MCU microprocessor is an RS232 interface or a Bluetooth interface; a user adopts remote Bluetooth wireless equipment or other input equipment to send a small transformation ratio current upper limit set value and a large transformation ratio current lower limit set value to an MCU microprocessor through a communication interface, a sampling current transformer CT1 collects the output current of a metering secondary winding of a complex ratio current transformer body CT in real time, the output current is converted into a voltage signal through a sampling resistor R, the voltage signal is processed through an RMS processing circuit module to obtain a voltage signal effective value, the voltage signal effective value is transmitted to an A/D conversion module, the voltage signal effective value is transmitted to the MCU microprocessor after analog-to-digital conversion of the A/D conversion module, and the MCU microprocessor converts the voltage signal effective value into a corresponding current collection value and compares the current collection value with the small transformation ratio current upper limit set value and the large transformation ratio current lower limit set value; when the current collection value is smaller than the lower limit set value of the large transformation ratio current, the MCU microprocessor enables the control relay JK to be electrified, the normally closed contact of the control relay JK is opened, the normally open contact of the control relay JK is closed, the large transformation ratio power-off delay relay J1 is delayed to lose power, the normally open contact J1-1 of the large transformation ratio power-off delay relay J1 is delayed to be opened, the large transformation ratio power-off delay relay J2 is electrified to enable the normally open contact J2-1 of the large transformation ratio power-off delay relay J2 to be closed, and the CT body of the complex ratio current transformer is switched from; on the contrary, when the current collection value is larger than the upper limit set value of the small transformation ratio current, the MCU microprocessor enables the control relay JK to lose power, the normally closed contact of the control relay JK is closed, the normally open contact of the control relay JK is opened, the large transformation ratio power-off delay relay J1 is electrified, the large transformation ratio power-off delay relay J2 delays power loss, the normally open contact J1-1 of the large transformation ratio power-off delay relay J1 is closed, the normally open contact J2-1 of the large transformation ratio power-off delay relay J2 delays power off, and the body CT of the complex ratio current transformer is switched to the large transformation ratio state from the small transformation ratio state.
2. The on-line intelligent switching complex ratio current transformer of claim 1, characterized in that both ends of the large and small transformation ratio common power-off delay relay J2 are connected in parallel with a small transformation ratio indicator lamp M1, and both ends of the large transformation ratio power-off delay relay J1 are connected in parallel with a large transformation ratio indicator lamp M2.
3. The on-line intelligent conversion complex ratio current transformer according to claim 1 or 2, characterized in that other secondary windings of the composite transformation ratio current transformer body CT also have a common tap end 2S1, a small transformation ratio tap end 2S2 and a large transformation ratio tap end 2S3, each of the other secondary windings respectively corresponds to a large and small transformation ratio common outage delay relay J4 and a large transformation ratio outage delay relay J3, the small transformation ratio tap end 2S2 of the secondary winding is connected with one end of a normally open contact J4-1 of the large and small transformation ratio common outage delay relay J4 corresponding to the secondary winding, and the other end of the normally open contact J4-1 of the large and small transformation ratio common outage delay relay J4 corresponding to the secondary winding is used as a common non-polar end 2COM of the secondary winding; the large transformation ratio tap end 2S3 of the secondary winding is simultaneously connected with one end of a normally closed contact J4-2 of a large transformation ratio common outage delay relay J4 corresponding to the secondary winding, one end of a normally open contact J3-1 of the large transformation ratio common outage delay relay J3 corresponding to the secondary winding and one end of one JB-2 of other normally closed contacts of a protection relay JB, and the other end of the normally closed contact J4-2 of the large transformation ratio common outage delay relay J4 corresponding to the secondary winding, the other end of the normally open contact J3-1 of the large transformation ratio outage delay relay J3 corresponding to the secondary winding and the other end of one JB-2 of the other normally closed contacts of the protection relay JB are all connected to the common non-polar end 2COM of the secondary winding; the large-to-small ratio common power-off delay relay J4 corresponding to other secondary windings and the large-to-small ratio common power-off delay relay J2 corresponding to the metering secondary winding are connected in parallel, and the large-to-large ratio power-off delay relay J3 corresponding to other secondary windings and the large-to-large ratio power-off delay relay J1 corresponding to the metering secondary winding are connected in parallel.
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| CN109546553A (en) * | 2019-01-23 | 2019-03-29 | 南昌市光辉电力科技有限公司 | A kind of 10KV high pressure measurement apparatus for descending of energy self-healing |
| CN110908285B (en) * | 2019-12-10 | 2023-04-07 | 国网山西省电力公司长治供电公司 | Self-adaptive control system of composite transformation ratio current transformer |
| CN113658788B (en) * | 2020-11-12 | 2024-04-30 | 四川泰克电器有限公司 | Automatic adjustable multi-transformation ratio current transformer |
| CN112802675A (en) * | 2020-12-30 | 2021-05-14 | 安徽一天电能质量技术有限公司 | Double-transformation-ratio manual automatic switching current transformer and control method thereof |
| CN113241245B (en) * | 2021-05-10 | 2022-03-11 | 大连北方互感器集团有限公司 | Current transformer with constant-value resistor and preparation method thereof |
| CN113777379B (en) * | 2021-08-24 | 2024-03-22 | 山东亿玛信诺电气有限公司 | Accurate metering current transformer and manufacturing method of double-magnetic-circuit current transformer |
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| CN2266184Y (en) * | 1995-08-18 | 1997-10-29 | 何排枝 | Multipurpose current mutual-inductor |
| WO2013106922A1 (en) * | 2012-01-19 | 2013-07-25 | Awesense Wireless Inc. | System and method for linear measurement of ac waveforms with low voltage non-linear sensors in high voltage environments |
| CN104237791A (en) * | 2013-06-20 | 2014-12-24 | 电子科技大学 | Lithium battery charge state estimation method, battery management system and battery system |
| CN106940391B (en) * | 2017-04-06 | 2019-04-12 | 国网山西省电力公司太原供电公司 | Threephase current transformer no-load voltage ratio on-line conversion intelligent controller |
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