CN204631238U - A kind of large direct current measuring device ripple response performance test macro - Google Patents
A kind of large direct current measuring device ripple response performance test macro Download PDFInfo
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- CN204631238U CN204631238U CN201520221192.9U CN201520221192U CN204631238U CN 204631238 U CN204631238 U CN 204631238U CN 201520221192 U CN201520221192 U CN 201520221192U CN 204631238 U CN204631238 U CN 204631238U
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Abstract
The utility model discloses a kind of large direct current measuring device ripple response performance test macro, comprise DC current source, DC current ratio standard device, harmonic current generator, alternating current ratio standard, D.C. voltmeter, wideband A.C. voltmeter, AC/DC voltage table, 3 measuring resistances, AC current sensor, phase-sensitive detector (PSD) and tested device.System can be simulated and produce D.C. high-current and contained ripple current, tests and determines whether tested device can reflect the ripple current in D.C. high-current strictly according to the facts while measuring D.C. high-current.The utility model solves a difficult problem: can not test the response performance of tested device to DC current and ripple current simultaneously.By the enforcement of test macro disclosed in the utility model, can test tested device ripple current response performance, the method, to ensureing Measurement accuracy and the control of D.C. high-current and reducing ripple current, has important practical significance to improve straight-flow system quality.
Description
Technical field
The utility model relates to a kind of large direct current measuring device ripple response performance test macro.
Background technology
Large direct current measuring device is widely used in scientific research and commercial production, and according to statistics in China's commercial production, direct current power consumption accounts for more than 30% of total electricity consumption, applies a large amount of direct current measuring devices in reality.In recent years in China's development rapidly, in D.C. high voltage transmission, direct current measuring devices also gets more and more D.C. high voltage transmission.In the face of large direct current measuring device that is a large amount of, different principle, it is crucial for how carrying out performance test to it.The method of testing of large direct current measuring device in DC performance and system, comparatively perfect at present, but to the method for its ripple response performance test and the means of enforcement deficient.In fact, no matter be D.C. high voltage transmission or the electricity consumption of commercial production direct current, all inevitably containing ripple in tested D.C. high-current, large direct current measuring device truly should be able to respond ripple.Ripple not only can affect the accuracy of DC current measurement, and the detection of ripple is to control and reduce ripple current, improves straight-flow system quality and also has important practical application meaning.
Utility model content
Technical problem to be solved in the utility model, just be to provide a kind of large direct current measuring device ripple response performance test macro, adopt the utility model, can determine that current measuring device is measure while DC current whether can ripple current in reflection DC current strictly according to the facts.
Solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of large direct current measuring device ripple response performance test macro, is characterized in that comprising:
One by through tested device induction zone wire connect harmonic current generator and alternating current ratio standard device and form harmonic current loop, wherein, the first measuring resistance of the described external parallel connection of alternating current ratio standard device and wideband A.C. voltmeter;
One connect DC current source by the wire through tested device induction zone, DC current ratio standard device, AC current sensor input end form DC current return, wherein, the second measuring resistance of the described external parallel connection of DC current ratio standard device and D.C. voltmeter;
3rd measuring resistance of the described external parallel connection of tested device output terminal and the dual-purpose voltage table of AC/DC;
Described AC current sensor output terminal connects phase-sensitive detector (PSD).
Described harmonic oscillator is made up of the change of the harmonic controller connected successively, power amplifier and up-flow, and harmonic oscillator, at least can produce 1 ~ 50 time, 0 ~ 500A harmonic current, simulates the harmonic oscillator of different ripple situation.
Alternating current ratio standard device is used for the measurement of harmonic wave loop harmonic current, and using the reference signal of the voltage signal of its correspondence as phase-sensitive detector (PSD), the accuracy of described alternating current ratio standard device should two class of accuracies at least higher than tested device accuracy.
Described DC current source should have high stability, and preferred DC current source can produce 0 ~ 5kA DC current; DC current ratio standard is used for the measurement of DC loop DC current amplitude, and the accuracy of DC current ratio standard should two class of accuracies at least higher than tested device accuracy.
Described DC current return and the acting in conjunction of harmonic wave current return contain the D.C. high-current of ripple in tested device with simulation.
In described DC loop when the measurement of harmonic current, the preferred Hall current sensor of AC current sensor and hollow core coil current sensor, the corresponding voltage that phase-sensitive detector (PSD) exports using alternating current ratio standard is as with reference to signal, with AC current sensor output for input, measure harmonic current.
Adopt said system to carry out the method for large direct current measuring device ripple response performance test, it is characterized in that comprising the following steps:
(1) start DC current source, up-flow is to selected DC current values gradually;
(2) start harmonic current generator, selected required frequency, up-flow is to selected harmonic current value gradually;
(3) the DC current ratio standard by being connected in series in DC loop exports, and measures DC current amplitude;
(4) the alternating current ratio standard by being connected in series in harmonic wave loop exports, and measures the amplitude of harmonic current;
(5) measured DC measurement mechanism output terminal access measuring resistance and AC/DC voltage table, measure the direct current output amplitude of tested device by voltage table zero frequency span, exchanges by voltage table the harmonic wave amplitude that shelves measure tested device;
(6) harmonic wave loop current and DC loop current acting in conjunction tested device, can cause the coupling between DC current return and harmonic wave current return, so harmonic current measured by incoming transport current sensor and phase-sensitive detector (PSD) in DC current return;
(7) no-load voltage ratio of measured DC measurement mechanism is K
x, the measuring resistance of access is R, outgoing side alternating voltage reading
value conversion is to input side current value
for:
the AC current sensor no-load voltage ratio accessed in DC loop is K
h(A/V), the voltage of phase-sensitive detector (PSD) and phase place reading U
h2with
conversion is to the harmonic current value of DC loop
for:
with harmonic wave loop current
to compare the transfer ratio and error thereof that can show that measured DC measurement mechanism responds ripple.
Beneficial effect: system and method for the present utility model, can determine current measuring device measuring while DC current, whether can ripple current in reflection DC current strictly according to the facts.
In test, the utility model simulation test direct current measuring devices is to the response performance containing ripple DC current, embodiment result shows that tested large direct current measuring device can with same no-load voltage ratio transmission direct current and ripple current signal, and the measuring error of ripple current is 1.17%.
Accompanying drawing explanation
Fig. 1 is the elementary diagram of direct current measuring devices ripple response performance test macro of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is illustrated further.
Carry out wiring as shown in Figure 1, the test of ripple response performance is carried out to 5000A:5A measured DC measurement mechanism.
Large direct current measuring device ripple response performance test macro of the present utility model, comprising:
One forms harmonic current loop by the wire connection harmonic current generator and alternating current ratio standard device that pass tested device induction zone, wherein, and the first measuring resistance of the described external parallel connection of alternating current ratio standard device and wideband A.C. voltmeter;
One connect DC current source by the wire through tested device induction zone, DC current ratio standard device, AC current sensor input end form DC current return, wherein, the second measuring resistance of the described external parallel connection of DC current ratio standard device and D.C. voltmeter;
3rd measuring resistance of the described external parallel connection of tested device output terminal and the dual-purpose voltage table of AC/DC;
Described AC current sensor output terminal connects phase-sensitive detector (PSD).
Described harmonic oscillator is made up of the change of the harmonic controller connected successively, power amplifier and up-flow, and harmonic oscillator, for can produce 1 ~ 50 time, 0 ~ 500A harmonic current, simulates the harmonic oscillator of different ripple situation.
Alternating current ratio standard is used for the measurement of harmonic wave loop harmonic current, and using the reference signal of the voltage signal of its correspondence as phase-sensitive detector (PSD), described alternating current ratio standard accuracy should two class of accuracies at least higher than tested device accuracy.
Described DC current source should have high stability, and preferred DC current source can produce 0 ~ 5kA DC current; DC current ratio standard is used for the measurement of DC loop DC current amplitude, and the accuracy of DC current ratio standard should two class of accuracies at least higher than tested device accuracy.
Described DC current return and the acting in conjunction of harmonic wave current return contain the D.C. high-current of ripple in tested device with simulation.
The measurement of harmonic current in described DC loop, the preferred Hall current sensor of AC current sensor and hollow core coil current sensor, phase-sensitive detector (PSD) exports corresponding voltage as with reference to signal using alternating current ratio standard, with AC current sensor output for input, measures harmonic current.
Adopt said system to carry out the method for large direct current measuring device ripple response performance test, it is characterized in that comprising the following steps:
(1) start DC current source, up-flow is to selected DC current values gradually;
(2) start harmonic current generator, selected required frequency, up-flow is to selected harmonic current value gradually;
(3) the DC current ratio standard by being connected in series in DC loop exports, and measures DC current amplitude;
(4) the alternating current ratio standard by being connected in series in harmonic wave loop exports, and measures the amplitude of harmonic current;
(5) measured DC measurement mechanism output terminal access measuring resistance and the dual-purpose voltage table of AC/DC, measure the direct current output amplitude of tested device by voltage table zero frequency span, exchanges by voltage table the harmonic wave amplitude that shelves measure tested device;
(6) harmonic wave loop current and DC loop current acting in conjunction tested device, can cause the coupling between DC current return and harmonic wave current return, so harmonic current measured by incoming transport current sensor and phase-sensitive detector (PSD) in DC current return;
(7) no-load voltage ratio of measured DC measurement mechanism is K
x, the measuring resistance of access is R, outgoing side alternating voltage reading
value conversion is to input side current value
for:
the AC current sensor no-load voltage ratio accessed in DC loop is K
h(A/V), the voltage of phase-sensitive detector (PSD) and phase place reading U
h2with
conversion is to the harmonic current value of DC loop
for:
with harmonic wave loop current
to compare the transfer ratio and error thereof that can show that measured DC measurement mechanism responds ripple.
For this example, specifically select 5kA DC current source, start DC current source, gradually up-flow, DC current is by tested D.C. high-current device, and be connected in series 5000A:5A DC current ratio standard in loop, its accuracy is 1.0 × 10
-6, measuring resistance is 0.2 Ω, and D.C. voltmeter accuracy is 1.0 × 10
-5, when up-flow is to 5000A, DC voltage meter reading is 1.0000V, and calculating DC current standard value is 5000A.
Then start harmonic current source, selected frequency is 650Hz, increases harmonic current gradually, and harmonic current is by measured DC device, and be connected in series 1000A:1A alternating current ratio standard in loop, its accuracy is 1.0 × 10
-5, measuring resistance is 0.2 Ω, and the accuracy of wideband A.C. voltmeter is 0.5 grade, and when harmonic current is to 100A, alternating voltage meter reading is 20.0mV, and calculating harmonic current standard value is 100A.
Tested device output terminal is by 0.2 Ω measuring resistance measuring voltage, and adopt the dual-purpose voltage table of AC/DC, its direct current accuracy is 1.0 × 10
-5, exchanging accuracy is 0.5 grade.Subject to the foregoing, zero frequency span reading is 1.0001V, and exchanging shelves reading is 19.1mV, and can be calculated measured DC measurement mechanism actual measurement DC current values is 5000.5A, and harmonic current measured value is 95.5A.
Hall AC current sensor is adopted to survey the harmonic wave of DC loop, no-load voltage ratio
accuracy is 1 grade, under these conditions, and the output amplitude reading U of phase-sensitive detector (PSD)
h2for 170mV, phase place reading
be 8 °, the harmonic current that can be calculated DC loop is 5.6A.
From testing above, the actual harmonic current of measured DC measurement mechanism input is 100A-5.6A=94.4A, is 1.17% to the measuring error of 650Hz harmonic current.
In embodiment, measuring error is 1.17%, the error of consideration Hall AC current sensor is 1 grade, the error requirements of electric system to 650Hz (13 times) harmonic current is 8%, and measured DC measurement mechanism ripple response performance can meet electric harmonic and measure requirement.
The utility model method can simulation test direct current measuring devices to containing the response performance of ripple DC current, embodiment result shows that tested large direct current measuring device can with same no-load voltage ratio transmission direct current and ripple current signal, and the measuring error of ripple current is 1.17%.
Claims (4)
1. a large direct current measuring device ripple response performance test macro, is characterized in that comprising:
One by the harmonic current loop formed through tested device induction zone wire connection harmonic current generator and alternating current ratio standard device; Wherein, the first measuring resistance of the described external parallel connection of alternating current ratio standard device and wideband A.C. voltmeter;
One by the DC current return formed through tested device induction zone wire connection DC current source, DC current ratio standard device, AC current sensor input end; Wherein, the second measuring resistance of the described external parallel connection of DC current ratio standard device and D.C. voltmeter;
3rd measuring resistance of the described external parallel connection of tested device output terminal and the dual-purpose voltage table of AC/DC;
Described AC current sensor output terminal connects phase-sensitive detector (PSD).
2. large direct current measuring device ripple response performance test macro according to claim 1, it is characterized in that: described harmonic oscillator is made up of the change of the harmonic controller connected successively, power amplifier and up-flow, harmonic oscillator, at least can produce 1 ~ 50 time, 0 ~ 500A harmonic current, simulates the harmonic oscillator of different ripple situation.
3. large direct current measuring device ripple response performance test macro according to claim 2, is characterized in that: accuracy two class of accuracies at least higher than tested device accuracy of described alternating current ratio standard device.
4. large direct current measuring device ripple response performance test macro according to claim 3, it is characterized in that: described DC current source is the DC current source that can produce 0 ~ 5kA DC current, have high stability, the accuracy of DC current ratio standard should two class of accuracies at least higher than tested device accuracy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820199A (en) * | 2015-04-13 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | DC large-current measuring device ripple responsiveness test system and method thereof |
| CN105675932A (en) * | 2016-01-21 | 2016-06-15 | 中国电力科学研究院 | Testing power supply for aging of lightning arrester of high-voltage DC power transmission system |
-
2015
- 2015-04-13 CN CN201520221192.9U patent/CN204631238U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820199A (en) * | 2015-04-13 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | DC large-current measuring device ripple responsiveness test system and method thereof |
| CN105675932A (en) * | 2016-01-21 | 2016-06-15 | 中国电力科学研究院 | Testing power supply for aging of lightning arrester of high-voltage DC power transmission system |
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