CN102279302A - Current measurer - Google Patents
Current measurer Download PDFInfo
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- CN102279302A CN102279302A CN2010101964519A CN201010196451A CN102279302A CN 102279302 A CN102279302 A CN 102279302A CN 2010101964519 A CN2010101964519 A CN 2010101964519A CN 201010196451 A CN201010196451 A CN 201010196451A CN 102279302 A CN102279302 A CN 102279302A
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Abstract
The invention discloses a current measurer which is used for measuring circuital current. A pin 600 and a pin PE of the current measurer are current signal input ends, and a pin 3200 and a pin 3201 are current signal output ends. A pin 900 and a pin 901 are connected with a working power supply of the current measurer. The current measurer can be used for solving the problem that too high working current cannot be detected and monitored in the production process of modern equipment. The current measurer is simple in structure, stable and reliable in function and strong in anti-interference capability, is convenient to mount and use, and is unanimously highly praised by the majority of users.
Description
Technical field
The present invention relates to technical field of electricity, particularly a kind of current measurement device that is used for the measurement of circuital current.
Background technology
When measuring the big electric current of exchange current, need be converted to more unified electric current (secondary of China's rated current mutual inductor is rated for 5A or 1A) for ease of the secondary instrument measurement, the voltage on the circuit is breakneck than higher as direct the measurement all in addition.Current transformer just plays unsteady flow and electrical isolation effect.It is the sensor that secondary device such as measurement instrument, relay protection obtains electric primary circuit current information in the electric system; current transformer converts high electric current to low current in proportion; the current transformer primary side is connected on primary system, secondary side joint measurement instrument, relay protection etc.
The mutual inductor secondary side is in approximate short-circuit condition during operate as normal, and output voltage is very low.Secondary Winding open circuit or a winding flow through abnormal current (as lightning current, resonance excess current, electric capacity charging current, inductance starting current etc.) if be in operation, and all can produce the superpotential of thousands of volts even volts up to ten thousand at secondary side.This not only works the mischief to electrical secondary system insulation, also can make the too drastic and scaling loss of mutual inductor, even the life security that jeopardizes the operations staff.
Along with the development of modern manufacturing industry, device systems is more and more huger, and Circuits System also becomes increasingly complex, and current flow is increasing, in case circuit breaks down, causes faults such as short circuit, and consequence is hardly imaginable, and the electric current of circuit need obtain monitoring.The electric current of a lot of motor devices is all very big, several peaces, and tens peace even peaces up to a hundred are not easy to measure.
Summary of the invention
In order to solve in the modern comfort production run, too high working current can't detect the problem of supervision, improves industrial efficient simultaneously, and the present invention proposes following technical scheme:
A kind of current measurement device, the pin 600 and the pin PE that are used for the described current measurement device of measurement of circuital current are the current signal input end, pin 3200 and pin 3201 current signal output ends.Pin 900 and pin 901 connect current measurement device working power.
Further, pin 600 and pin PE two ends connect into circle, and the electric wire of required measurement electric current passes from circle.
The beneficial effect that a kind of current measurement device of the present invention brings is:
1, solved in the modern comfort production run, too high working current can't detect the problem of supervision.
2, this apparatus structure is simple, and function-stable is reliable, and it is convenient to install, and easy to use, antijamming capability is strong.Obtain users' consistent favorable comment.
Description of drawings
Fig. 1 structure principle chart of the present invention
Embodiment
The present invention is further described below in conjunction with drawings and the specific embodiments.
A kind of current measurement device as shown in Figure 1 is used for the measurement of circuital current, it is characterized in that: the pin 600 of described current measurement device and pin PE are the current signal input end, pin 3200 and pin 3201 current signal output ends.Pin 900 and pin 901 connect current measurement device working power.
Wherein, pin 600 and pin PE two ends connect into circle, and the electric wire of required measurement electric current passes from circle.
This current protector is installed in the electrical equipment control circuit; the electric wire of required metering circuit is passed therethrough, can record the electric current of this circuit, simultaneously this electric current is transformed in certain proportion; form with analog quantity sends then, can deliver to the master controller of system.
Current transformer utilizes electric current proportional characteristics in the former and deputy limit of transformer to make.Its principle of work, equivalent circuit are also identical with general transformer, and just its former limit windings in series is in circuit-under-test, and the number of turn seldom; The secondary winding connects low-impedance loads such as reometer, relay current coil, approximate short circuit.Primary current (being tested electric current) and secondary current depend on the load of test line, and irrelevant with the secondary load of current transformer.Because secondary approaches short circuit, so former and deputy polygonal voltage U1 and Uc2 are very little, exciting current I0 is also very little.
During the current transformer operation, secondary does not allow open circuit.Because in case open circuit, primary current all becomes exciting current, makes magnetic flux and secondary voltage substantially exceed normal value and jeopardize the person and device security.Therefore, the current transformer secondary mustn't connect fuse in the loop, does not also allow just to pull down equipment such as reometer, relay without bypass in when operation.
The mode of connection of current transformer is determined by the service requirement of its load that connects.The most frequently used mode of connection is single-phase, three-phase star and incomplete star.
The nominal transformation ratio KN of nominal transformation ratio and error mutual inductor refers to the rated transformation ratio of the rated voltage ratio summation current transformer of voltage transformer (VT).The former is defined as the ratio of former limit winding rated voltage U1N and secondary winding rated voltage U2N; The latter then is rated current I1N and the ratio of I2N.Promptly
KN＝U1N/U2N
(to voltage transformer (VT))
KN＝I1N/I2N
(to current transformer)
Voltage (or electric current) mutual inductor original edge voltage (or electric current) is when changing within the specific limits, general provision is 0.85～1.15U1N (or 10～120%I1N), secondary voltage (or electric current) should change in proportion, and former and deputy polygonal voltage (or electric current) should same-phase.But exist factors such as internal impedance, exciting current and loss to make ratio and phase place error occur owing to mutual inductor, be called ratio and angular difference.
Ratio is the ratio of the difference of secondary voltage (or secondary current) and primary voltage (or primary current) value size after conversion to the latter, promptly
FU is the ratio of voltage transformer (VT), and fI is the ratio of current transformer.When KNU2＞U1 (during or KNI2＞I1), ratio is being for just, on the contrary for negative.
To not taking the voltage transformer (VT) of indemnifying measure, ratio is for negative, angular difference be generally on the occasion of, the absolute value of ratio and angular difference all reduce with the increase of voltage; When iron core was saturated, ratio and angular difference all increased with the increase of voltage.
For the current transformer of not taking indemnifying measure, ratio is a negative value, angular difference be on the occasion of, the absolute value of ratio and angular difference all increase with electric current and reduce.
Adopt the way that compensates to reduce the error of mutual inductor.Generally, and insert corresponding resistance, inductance, capacity cell and compensate by on mutual inductor, adding around additional winding or increasing additionally unshakable in one's determination.Penalty method commonly used has turn compensation, fractional turns compensation, little compensation unshakable in one's determination, parallel capacitive compensation etc.
Above-described only is preferred implementation of the present invention, should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the invention design, can also make some distortion and improvement, and these all belong to protection scope of the present invention.
Claims (2)
1. a current measurement device is used for the measurement of circuital current, it is characterized in that: the pin 600 of described current measurement device and pin PE are the current signal input end, pin 3200 and pin 3201 current signal output ends.Pin 900 and pin 901 connect current measurement device working power.
2. a kind of current measurement device according to claim 1 is characterized in that: pin 600 and pin PE two ends connect into circle, and the electric wire of required measurement electric current passes from circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101964519A CN102279302A (en) | 2010-06-10 | 2010-06-10 | Current measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101964519A CN102279302A (en) | 2010-06-10 | 2010-06-10 | Current measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102279302A true CN102279302A (en) | 2011-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101964519A Pending CN102279302A (en) | 2010-06-10 | 2010-06-10 | Current measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102279302A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016256A (en) * | 2014-06-23 | 2014-09-03 | 重庆川九建设有限责任公司 | Double-voltage control system for mine hoisting winch |
-
2010
- 2010-06-10 CN CN2010101964519A patent/CN102279302A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016256A (en) * | 2014-06-23 | 2014-09-03 | 重庆川九建设有限责任公司 | Double-voltage control system for mine hoisting winch |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111214 |