CN205176152U - High voltage direct current filter capacitor audible noise test circuit - Google Patents
High voltage direct current filter capacitor audible noise test circuit Download PDFInfo
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- CN205176152U CN205176152U CN201520871374.0U CN201520871374U CN205176152U CN 205176152 U CN205176152 U CN 205176152U CN 201520871374 U CN201520871374 U CN 201520871374U CN 205176152 U CN205176152 U CN 205176152U
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Abstract
The utility model provides a high voltage direct current filter capacitor audible noise test circuit, includes DC voltage loading return circuit and harmonic current loading return circuit, characterized by: be provided with blocking capacitor, it is parallelly connected with humorous carrier loading return circuit that blocking capacitor is passed through in DC voltage load return circuit, blocking capacitor with by test article high voltage direct current filter capacitor parallel connection, blocking capacitor also filled the DC voltage with same numerical value when the quilt was tested article and is filled with the DC voltage, blocking capacitor still tests the article series connection with the quilt in humorous carrier loading return circuit, the blocking capacitor's that flows through harmonic current is the same with the harmonic current numerical value of flowing through by the test article. The utility model discloses a set up the blocking capacitor messenger DC voltage harmonious carrier loading return circuit in return circuit and connected in parallel, not only guaranteed the safety in humorous carrier loading return circuit but also can guarantee that harmonic current exports high voltage direct current filter capacitor examination article to. Rectification silicon stack in the DC voltage loading return circuit and current -limiting resistor play barrier effect to harmonic voltage simultaneously, guarantee that power frequency power supply is not influenced.
Description
Technical field
The present invention relates to high voltage direct current filter capacitor noise measurement field, be specifically related to a kind of for direct current transportation DC filter capacitors audible noise hookup.
Background technology
Along with direct current transportation is fast-developing in China, in HVDC (High Voltage Direct Current) transmission system, be direct current by convert alternating current and be that alternating current all completes in DC converter station by DC power conversion.Power capacitor is one of key equipment of HVDC (High Voltage Direct Current) transmission system, is also one of topmost audible noise (hereinafter referred to as noise) source in HVDC converter substation.Jumbo filtering, parallel capacitor device is had in DC converter station, because in capacitor device, capacitor unit quantity is many, large and the higher harmonic current of single capacitor capacity flows into the factors such as capacitor, makes capacitor noise become one of principal ingredient of noise in DC converter station.Noise can cause adverse effect to the normal productive life of surrounding resident.Along with the enhancing of people's environmental consciousness, more and more higher to the noise requirements of equipment.Capacitor noise measures the basic demand having become HVDC converter substation and built.But the generation method of testing laboratory's inner high voltage DC filter capacitors noise does not all also have clear and definite regulation at home and abroad at present, the noise figure of the high voltage direct current filter capacitor that different tests unit is measured does not have comparability.
In actual motion and noise fest are measured, can affect capacitor noise to power frequency (50Hz) magnitude of load that high voltage direct current filter capacitor applies, the harmonic load of capacitor also greatly affects capacitor noise simultaneously.As shown in Figure 4, the noise that the noise that some harmonic load causes even causes than power frequency load is larger.In addition, the noise intensity that each noise radiation surface radiation of high voltage direct current filter capacitor goes out is not quite similar, i.e. the noise of high voltage direct current filter capacitor radiation has certain directive property.In requirement at present to capacitor noise measurement, do not consider these factors.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high voltage direct current filter capacitor audible noise hookup, makes test findings have comparability.
For solving the problem, technical scheme of the present invention is:
A kind of high voltage direct current filter capacitor audible noise hookup, comprise DC voltage and load loop and harmonic wave current load loop, unlike the prior art: be provided with block condenser, DC voltage loading loop is in parallel with harmonic loading loop by block condenser;
Block condenser and product to be tested high voltage direct current filter capacitor are connected in parallel, and product to be tested fills and also fills with the DC voltage of same numerical value with block condenser while DC voltage;
Block condenser is also connected in series with product to be tested in harmonic loading loop, and the harmonic current flowing through block condenser is identical with the harmonic current numerical value flowing through product to be tested
Described DC voltage loads loop and converts power frequency ac voltage to DC voltage by rectification silicon stack, and the adjustment of DC voltage value is completed by adjustment power-frequency voltage value, and the power-frequency voltage in circuit is exported by power frequency supply provide through pressure regulator, transformer.Current-limiting resistance plays a protective role in charge circuit.
Described harmonic current loads loop and produces low pressure harmonic signal by harmonic signal source, zooms into the harmonic voltage of certain amplitude after signal source output signal through power amplifier, then is outputted in capacitor loops by harmonic wave transformer boost and form harmonic current.Current transformer goes back to the parameter feedback of harmonic current to harmonic signal source, accurately controls the parameter of harmonic current.Harmonic loading part can produce the harmonic current of tens different frequencies, amplitude simultaneously, the basic actual operating mode covering high voltage direct current filter capacitor.Individual harmonic current amplitude and harmonic frequency can regulate separately.
Described compensating inductance can carry out series compensation to high voltage direct current filter capacitor when Harmonic Current off-capacity.
Advantage of the present invention is: by being provided with block condenser, DC voltage loop and harmonic loading loop being together in parallel, not only ensureing the safety in harmonic loading loop but also can guarantee that harmonic current exports high voltage direct current filter capacitor test product to.Rectification silicon stack in the loop of DC voltage loading simultaneously and current-limiting resistance play iris action to harmonic voltage, ensure that power frequency supply is unaffected.
Accompanying drawing explanation
Fig. 1 is the structural drawing of high voltage direct current filter capacitor direct current of the present invention synthesis harmonic current loaded circuit.
Fig. 2 is the structural drawing that DC voltage loads loop feature.
Fig. 3 is the structural drawing that harmonic current loads loop feature.
Noise 1/3 octave component figure when Fig. 4 is high voltage direct current filter capacitor DC stacked 600Hz and 1200Hz harmonic wave.
Embodiment
A kind of high voltage direct current filter capacitor audible noise of the present invention hookup, comprise two parts, DC voltage loads loop feature (as shown in Figure 2) and harmonic wave current load loop feature (as shown in Figure 3), this two parts loaded circuit is combined as high voltage direct current filter capacitor audible noise hookup (as shown in Figure 1), DC voltage in circuit loads loop feature and harmonic wave current load loop feature is separate, does not interfere with each other.Wherein, the block condenser in circuit makes DC voltage loop and harmonic loading loop be together in parallel, and not only ensures the safety in harmonic loading loop but also can guarantee that harmonic current exports high voltage direct current filter capacitor test product to.Rectification silicon stack in the loop of DC voltage loading simultaneously and current-limiting resistance play iris action to harmonic voltage, ensure that power frequency supply is unaffected.Wherein:
DC voltage loads loop feature: for product to be tested provides galvanic current pressure, DC voltage value can adjust as required.Convert power frequency ac voltage to DC voltage by rectification silicon stack, completed the adjustment of DC voltage value by adjustment power-frequency voltage value.Power-frequency voltage in circuit is exported by power frequency supply provide through pressure regulator, transformer.Current-limiting resistance plays a protective role in charge circuit.Block condenser and product to be tested high voltage direct current filter capacitor are connected in parallel, and product to be tested fills with while DC voltage, and block condenser also fills with the DC voltage of same numerical value.
Harmonic current loads loop feature: for product to be tested provides harmonic current, harmonic current and harmonic frequency can adjust as required.Produce low pressure harmonic signal by harmonic signal source, signal source output signal zooms into the harmonic voltage of certain amplitude through power amplifier, then is outputted in capacitor loops by harmonic wave transformer boost and form harmonic current.Current transformer goes back to the parameter feedback of harmonic current to harmonic signal source, can realize accurately controlling harmonic current.Harmonic loading part can produce the harmonic current of tens different frequencies, amplitude simultaneously, and each harmonic current and frequency can regulate separately.Compensating inductance in Fig. 3 can carry out series compensation to high voltage direct current filter capacitor when Harmonic Current off-capacity.Block condenser is connected in series with product to be tested in harmonic loading loop, and the harmonic current flowing through block condenser is identical with the harmonic current numerical value flowing through product to be tested.
A kind of high voltage direct current filter capacitor audible noise test method, comprises the following steps:
The first step: choosing of device parameter
Power frequency supply needs to select suitable capacity according to the total volume of test product and block condenser parallel connection.Select the rated voltage of transformer will meet the DC voltage of test product and the requirement of capacity after rectification.Harmonic Current capacity is determined according to needing the harmonic wave total volume loaded during test.Current-limiting resistance and rectification silicon stack carry out type selecting according to the requirement of the total volume charging voltage of test product and block condenser parallel connection.
The selection and comparison of block condenser is crucial, and it is in parallel with test product at charge circuit, connects with test product in harmonic loading loop.Bear DC voltage and the harmonic current of numerical value same with test product.Compensating inductance can choose suitable inductance compensation according to series compensation formulae discovery when Harmonic Current capacity is inadequate.
Second step: build test loop according to circuit shown in Fig. 1, the system of should be noted can only little work ground connection.Other Instruments instrument must have independently protective ground.
3rd step: test load condition
First load DC voltage: power-frequency voltage closes a floodgate, boosted voltage gradually, after making the DC voltage on test product meet the requirement of test, keep stable.Then harmonic current is loaded: require to load individual harmonic current according to the noise testing of product to be tested, after meeting the demands, start noise testing.Test and first exited harmonic current power supply afterwards, then exited power frequency supply.After power supply exits, capacitor still has DC voltage.If capacitor is with electric discharge device, then wait capacitor discharge complete again by test product and block condenser the two poles of the earth short circuit, off-test; If capacitor self does not have electric discharge device, then again by test product and block condenser the two poles of the earth short circuit after needing an external damping electric discharge device to discharge, off-test.
Tested high voltage direct current filter capacitor test product is lifted on noise elimination test zone medium position, a surface of tested high voltage direct current filter capacitor test product be parallel to ground and distance ground distance for being less than 0.7m, the horizontal range of any one side of other surface distance noise elimination test zones of described tested high voltage direct current filter capacitor test product is no less than 2m.
REgulatable reactor, high-voltage ac power, rectification silicon stack, block condenser, humorous frequency power and operation bench are all positioned at outside described noise elimination test zone.
Claims (5)
1. a high voltage direct current filter capacitor audible noise hookup, comprise DC voltage and load loop and harmonic wave current load loop, it is characterized in that: be provided with block condenser, it is in parallel with harmonic loading loop by block condenser that DC voltage loads loop;
Block condenser and product to be tested high voltage direct current filter capacitor are connected in parallel, and product to be tested fills and also fills with the DC voltage of same numerical value with block condenser while DC voltage;
Block condenser is also connected in series with product to be tested in harmonic loading loop, and the harmonic current flowing through block condenser is identical with the harmonic current numerical value flowing through product to be tested.
2. high voltage direct current filter capacitor audible noise hookup according to claim 1, it is characterized in that: described DC voltage loads loop and converts power frequency ac voltage to DC voltage by rectification silicon stack, the adjustment of DC voltage value is completed by adjustment power-frequency voltage value, and the power-frequency voltage in circuit is exported by power frequency supply provide through pressure regulator, transformer.
3. high voltage direct current filter capacitor audible noise hookup according to claim 1, described harmonic current loads loop and produces low pressure harmonic signal by harmonic signal source, to zoom into the harmonic voltage of certain amplitude after signal source output signal through power amplifier, then outputted in capacitor loops by harmonic wave transformer boost and form harmonic current.
4. high voltage direct current filter capacitor audible noise hookup according to claim 3, is characterized in that: the amplitude of described harmonic current and harmonic frequency can regulate separately.
5. high voltage direct current filter capacitor audible noise hookup according to claim 1, is characterized in that: be provided with compensating inductance, can carry out series compensation when Harmonic Current off-capacity to high voltage direct current filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520871374.0U CN205176152U (en) | 2015-11-04 | 2015-11-04 | High voltage direct current filter capacitor audible noise test circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520871374.0U CN205176152U (en) | 2015-11-04 | 2015-11-04 | High voltage direct current filter capacitor audible noise test circuit |
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| CN205176152U true CN205176152U (en) | 2016-04-20 |
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| CN201520871374.0U Expired - Fee Related CN205176152U (en) | 2015-11-04 | 2015-11-04 | High voltage direct current filter capacitor audible noise test circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242124A (en) * | 2015-11-04 | 2016-01-13 | 桂林电力电容器有限责任公司 | Testing circuit and testing method for audible noise of high-voltage direct current filter capacitor |
| CN107748301A (en) * | 2017-11-24 | 2018-03-02 | 南方电网科学研究院有限责任公司 | A kind of high voltage direct current filter capacitor noise testing loaded circuit |
-
2015
- 2015-11-04 CN CN201520871374.0U patent/CN205176152U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242124A (en) * | 2015-11-04 | 2016-01-13 | 桂林电力电容器有限责任公司 | Testing circuit and testing method for audible noise of high-voltage direct current filter capacitor |
| CN107748301A (en) * | 2017-11-24 | 2018-03-02 | 南方电网科学研究院有限责任公司 | A kind of high voltage direct current filter capacitor noise testing loaded circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20191104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |