CN110470876A - A kind of the high_voltage isolation detection circuit and detection method of neutral earthing high-pressure system - Google Patents
A kind of the high_voltage isolation detection circuit and detection method of neutral earthing high-pressure system Download PDFInfo
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- CN110470876A CN110470876A CN201910887055.1A CN201910887055A CN110470876A CN 110470876 A CN110470876 A CN 110470876A CN 201910887055 A CN201910887055 A CN 201910887055A CN 110470876 A CN110470876 A CN 110470876A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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Abstract
The invention discloses a kind of high_voltage isolation detection circuit of neutral earthing high-pressure system and detection methods, the circuit includes voltage sensor, first divider resistance module and the second divider resistance module, the input anode connection of the primary side of first divider resistance module one end and voltage sensor, the first divider resistance module other end is connect with high-pressure system output cathode, the primary side of second divider resistance module one end and voltage sensor inputs cathode connection, the second divider resistance module other end is connect with high-pressure system output negative pole, first divider resistance module is identical with the second divider resistance module, it is symmetrical arranged on current limliting bleeder circuit branch road.The present invention is cooperated using standard specification divider resistance and voltage sensor, completes the voltage detecting of the 6kV high voltage power supply of neutral earthing, can reduce the volume and cost of detection device.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of high_voltage isolation detection of neutral earthing high-pressure system
Circuit and detection method.
Background technique
Output voltage detection for two pole ferroelectricity sources and quadrupole ferroelectricity source, the peak value of output voltage is when normal work
6kV, according in " GB4943.1-2011 Information Technology Equipment safety first part: General Requirement " existing voltage detecting circuit
The former and deputy side isolation voltage of the isolation voltage sensor of use at least needs 7.5kV, it is also necessary to mating mutual inductor, 7.5kV and
The isolation voltage sensor bulk of 7.5kV or more is big, at high price, requirements of installation space Relatively centralized.
Summary of the invention
In order to overcome shortcomings and deficiencies of the existing technology, the present invention provides a kind of high pressure of neutral earthing high-pressure system
Isolation detection circuit and detection method are passed using the voltage of standard specification sampling divider resistance and standard specification isolation voltage grade
Sensor cooperation, complete the voltage isolation detection of the 6kV high voltage power supply of neutral earthing, effectively reduce detection device volume and
Cost.
In order to achieve the above object, the invention adopts the following technical scheme:
The present invention provides a kind of high_voltage isolation detection circuit of neutral earthing high-pressure system, comprising: voltage sensor, first
Divider resistance module and the second divider resistance module；
The input anode connection of the primary side of described first divider resistance module one end and voltage sensor, the first partial pressure electricity
The resistance module other end is connect with high-pressure system output cathode, the primary side of described second divider resistance module one end and voltage sensor
Cathode connection is inputted, the second divider resistance module other end is connect with high-pressure system output negative pole, the first partial pressure electricity
It is identical with the second divider resistance module to hinder module, is symmetrical arranged on current limliting bleeder circuit branch road.
The first divider resistance module is equipped with first resistor, second resistance, third electricity as a preferred technical solution,
Resistance, the 4th resistance and the 5th resistance, the interior resistance being arranged of the first divider resistance module are connected in series；Second partial pressure
Resistive module is equipped with the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance, the second divider resistance mould
The resistance being arranged in block is connected in series.
The first divider resistance module is equipped with the first divider resistance series arm, second as a preferred technical solution,
Divider resistance series arm and third divider resistance series arm, described first divider resistance series arm one end and high-pressure system
Output cathode connection, the first divider resistance series arm other end are connected company with second divider resistance series arm one end
It connects, the primary side input anode connection of the second divider resistance series arm other end and voltage sensor, first partial pressure
Resistance series arm is connect with the second divider resistance series arm junction with third divider resistance series arm one end, and described
Three divider resistance series arm other ends ground connection；
The second divider resistance module is equipped with the 4th divider resistance series arm, the 5th divider resistance series arm and the
Six divider resistance series arms, described 4th divider resistance series arm one end are connect with high-pressure system output negative pole, and described
The four divider resistance series arm other ends and the 5th divider resistance series arm one end are connected in series, the 5th divider resistance string
Join the primary side input cathode connection of the branch other end and voltage sensor, the 4th divider resistance series arm and the 5th partial pressure
Resistance series arm junction is connect with the 6th divider resistance series arm one end, and the 6th divider resistance series arm is another
End ground connection.
The first divider resistance series arm is equipped with first resistor, second resistance, third as a preferred technical solution,
Resistance and the 4th resistance, the second divider resistance series arm are equipped with the 5th resistance and the 6th resistance, the third partial pressure electricity
It hindering series arm and is equipped with thirteenth resistor and the 14th resistance, described first resistor one end is connect with high-pressure system output cathode,
The first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance are connected in series, and the described 6th
The input anode connection of the primary side of resistance one end and voltage sensor, the junction and the 13rd of the 4th resistance and the 5th resistance
The connection of resistance one end, the thirteenth resistor other end are connect with the 14th resistance one end, another termination of the 14th resistance
Ground；
The 4th divider resistance series arm is equipped with the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor,
The 5th divider resistance series arm is equipped with the 7th resistance and the 8th resistance, and the 6th divider resistance series arm is equipped with the
The primary side input cathode connection of 15 resistance and the 16th resistance, described 7th resistance one end and voltage sensor, the described 7th
Resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor are connected in series, the 12nd electricity
Resistance one end is connect with high-pressure system output negative pole, and the 8th resistance and the 9th resistance joint and the 16th resistance one end connect
It connects, the 16th resistance other end is connect with the 15th resistance one end, the 15th resistance other end ground connection.
The resistance uses high-pressure glass glaze film resistance as a preferred technical solution,.
Use ± 15V in voltage sensor pair side powers as a preferred technical solution, and the voltage sensor is equipped with
The current signal delivery outlet proportional to output voltage.
The voltage sensor uses isolation voltage for the voltage sensor of 6kV as a preferred technical solution,.
It is additionally provided with first capacitor and the second capacitor, the first capacitor anode and high pressure system as a preferred technical solution,
Output cathode of uniting connects, the first capacitor cathode ground connection, and connect with the second capacitance cathode, the second capacitor cathode and height
The connection of pressure system output negative pole.
The present invention provides a kind of detection method of the high_voltage isolation detection circuit of neutral earthing high-pressure system, including following steps
It is rapid:
Electric power output voltage is through the first divider resistance module, voltage sensor and the second divider resistance module by voltage signal
Be converted to current signal；
The calculation relational expression of voltage sensor original edge voltage and secondary current are as follows:
Wherein, uoFor output voltage virtual value, unit V, ioFor voltage sensor output current signal, unit A,
roFor the resistance value of each resistance in the first divider resistance module, the second divider resistance module.
The present invention provides a kind of detection method of the high_voltage isolation detection circuit of neutral earthing high-pressure system, including following steps
It is rapid:
The resistance current limliting network that electric power output voltage is formed through the first divider resistance module and the second divider resistance module, will
Voltage signal is converted to current signal, then amplification output is isolated in current signal through voltage sensor；
Ignore voltage sensor primary side internal resistance, the calculation relational expression of voltage sensor original edge voltage and secondary current signal
Are as follows:
Wherein, uoFor output voltage virtual value, unit V, ioFor voltage sensor output current signal, unit A,
roFor the resistance value of each resistance in the first divider resistance module, the second divider resistance module.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the characteristics of present invention is using power supply output neutral earthing, using standard specification isolation voltage AC6kV voltage sensor
Device realizes the detection of peak value 6kV high-voltage isolating, without the voltage sensor of AC7500V isolation voltage, effectively saving cost
And volume.
(2) using discrete standard specification high-tension resistive in series and parallel and standard specification voltage sensor cooperation realization high voltage every
From detection, space and cost are saved.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the high_voltage isolation detection circuit of the neutral earthing high-pressure system of the present embodiment 1；
Fig. 2 is the structural schematic diagram of the high_voltage isolation detection circuit of the neutral earthing high-pressure system of the present embodiment 2.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1
As shown in Figure 1, being equipped with voltage the present embodiment provides a kind of high_voltage isolation detection circuit of neutral earthing high-pressure system
Sensor and multiple divider resistances, multiple divider resistances are connected on output voltage both ends, in the neutral earthing position of Symmetrical
Series connection access voltage sensor,
The high_voltage isolation detection circuit of the present embodiment specifically includes: voltage sensor, the first divider resistance module and second
Divider resistance module；The input anode connection of the primary side of first divider resistance module one end and voltage sensor, the first divider resistance
The module other end is connect with high-pressure system output cathode, and the primary side input of second divider resistance module one end and voltage sensor is negative
Pole connection, the second divider resistance module other end connect with high-pressure system output negative pole, the first divider resistance module and second point
Piezoresistance module is identical, is symmetrical arranged on current limliting bleeder circuit branch road.
In the present embodiment, the first divider resistance module is equipped with first resistor, second resistance, 3rd resistor, the 4th resistance
With the 5th resistance, the interior resistance being arranged of the first divider resistance module is connected in series；Second divider resistance module is equipped with the 6th electricity
Resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance, the interior resistance company of series connection being arranged of the second divider resistance module
It connects.
The voltage sensor primary current rated current of the present embodiment is 10mA, maximum 20mA, detected power supply output
Voltage peak 6kV is calculated it is found that the resistance using 10 39k Ω is connected, and the power of each resistance is 4.6W, it is contemplated that resistance
The factor of self-cold radiating, the rated power of each resistance are at least 25W, and in the present embodiment, divider resistance selects high-pressure glass
Glaze film resistance.
In the present embodiment, using the neutral earthing of high voltage power supply output filter capacitor it the characteristics of, is connected using resistance, and
At the midpoint of Symmetrical, closely potential position seals in voltage sensor, chooses high-pressure glass glaze film resistance partial pressure and current limliting,
Cooperate the voltage sensor of isolation voltage 4.7kV or more that can meet the voltage detecting under nominal situation and safety demand again.
Type selecting Consideration of the present embodiment about voltage sensor: consider voltage sensor primary current range and
Voltage of the C and D point of the primary side of damage voltage sensor relative to the earth.
1. the C as shown in figure 1 when working normally is connect with the "+" of voltage sensor primary side and "-" end respectively with D point, electricity
Pressure sensor pair side use ± 15V power supply, DC500V pressure resistance between the power supply and the earth can be regarded as and greatly close to current potential.
2. the improper connection of voltage detecting branch but power supply normal operating conditions, such as voltage sensor primary side series connection current limliting
Resistance branch disconnects extremely, C and D point current potential to the voltage of the earth since the partial pressure effect of capacitor C1, C2 are clamped down on as 3kV, this
Situation is from safety angle according to " GB4943.1-2011 Information Technology Equipment safety first part: General Requirement " voltage sensor
The isolation voltage on former and deputy side requires to be at least AC 4.7kV.
3. abnormal operating state occurs simultaneously with improper connection, such as voltage sensor primary side series connection current limliting electricity
Resistance branch disconnects extremely while resonant load is detuning causes power port overvoltage, and voltage peak is more than 6kV, C and D point current potential pair
The voltage of the earth is the half of port anomaly peak voltage, this situation is from safety angle according to " GB4943.1-2011 information technology
Equipment safety first part: General Requirement " require the isolation voltage of voltage sensor at least also to reserve on the basis of 4.7kV
1.2 times of surplus.
In conclusion the voltage sensor type selecting of the present embodiment are as follows: LV100, brand are as follows: LEM, this voltage sensor every
Ionization voltage is 6kV, moderate, small in size, light-weight, meets detection demand and safety demand.
Detection circuit as shown in Figure 1, electric power output voltage believe voltage through R1~R5, voltage sensor, R6~R10 branch
Number current signal is converted to, voltage sensor amplifies primary current.Former and deputy side electric current ratio is 10:25；
The relational expression that voltage sensor original edge voltage and secondary current are derived according to Ohm's law are as follows:
Wherein, uoFor output voltage virtual value, unit V, ioFor the current signal of voltage sensor output, unit A.
With this formula (1) and voltage sensor primary current peak value 20mA, the retrospectively calculate detection circuit it is detectable
Peak-peak voltage 7.8kV；From safety angle " GB4943.1-2011 Information Technology Equipment safety first part: General Requirement "
Search the peak-peak voltage of power port permission reversely with voltage sensor 6kV isolation voltage as 8.8kV.To sum up meet simultaneously
Under conditions of device range and safety, the peak-peak voltage 7.8kV that power port allows, with the nominal ceiling voltage 6kV of equipment
It compares, there is 1.3 times of voltage detection margins.The feasible precondition of this design scheme is the not super 7.8kV of power port voltage, and not
Will appear power supply resonant load it is detuning caused by power port there are the improper high-pressure situations of 7.8kV or more.Consider power supply
The capacitor pressure resistance of port C1 and C2 are AC 3kV, and the power port voltage peak value that it allows in the case of pressing is 8484V.If
Consider further that 1.1 times of overvoltage capabilities of capacitor, the port voltage of highest in short-term that power port capacitor allows is 9332.4V.In order to disappear
Except " short slab " that the detection range of port voltage detection circuit is relatively low, examined for the detection surplus under safety and damage
Consider, optimization design embodiment 2.
Embodiment 2:
For the technical solution of the present embodiment 2 other than following technical characteristics, other technical solutions are same as Example 1:
In order to guarantee power-supply system, there is abnormal operating state, (for example resonant load is detuning causes the high electricity of power port
Pressure still can work normally when voltage is greater than 7.8kV), as shown in Fig. 2, providing a kind of neutral earthing high pressure in the present embodiment
Power port is allowed voltage to improve by the high_voltage isolation detection circuit of system under the premise of no substantial increase current-limiting resistance quantity
To 7.8kV or more.
In the present embodiment, the first divider resistance module is equipped with the first divider resistance series arm, the second divider resistance string
Connection branch and third divider resistance series arm, first divider resistance series arm one end are connect with high-pressure system output cathode,
The first divider resistance series arm other end and second divider resistance series arm one end are connected in series, the series connection of the second divider resistance
The input anode connection of the primary side of the branch other end and voltage sensor, the first divider resistance series arm and the second divider resistance string
Connection branch junction is connect with third divider resistance series arm one end, third divider resistance series arm other end ground connection；
In the present embodiment, the second divider resistance module is equipped with the 4th divider resistance series arm, the 5th divider resistance string
Connection branch and the 6th divider resistance series arm, the 4th divider resistance series arm one end are connect with high-pressure system output negative pole,
The 4th divider resistance series arm other end and the 5th divider resistance series arm one end are connected in series, the series connection of the 5th divider resistance
The primary side of the branch other end and voltage sensor inputs cathode connection, the 4th divider resistance series arm and the 5th divider resistance string
Connection branch junction is connect with the 6th divider resistance series arm one end, the 6th divider resistance series arm other end ground connection.
In the present embodiment, the first divider resistance series arm is equipped with first resistor, second resistance, 3rd resistor and the 4th
Resistance, the second divider resistance series arm are equipped with the 5th resistance and the 6th resistance, and third divider resistance series arm is equipped with the tenth
Three resistance and the 14th resistance, first resistor one end are connect with high-pressure system output cathode, first resistor, second resistance, third
Resistance, the 4th resistance, the 5th resistance and the 6th resistance are connected in series, the primary side input of the 6th resistance one end and voltage sensor
Anode connection, the junction of the 4th resistance and the 5th resistance are connect with thirteenth resistor one end, the thirteenth resistor other end and the
The connection of 14 resistance one end, the 14th resistance other end ground connection；
In the present embodiment, the 4th divider resistance series arm is equipped with the 9th resistance, the tenth resistance, eleventh resistor and the
12 resistance, the 5th divider resistance series arm are equipped with the 7th resistance and the 8th resistance, and the 6th divider resistance series arm is equipped with
The primary side input cathode connection of 15th resistance and the 16th resistance, the 7th resistance one end and voltage sensor, the 7th resistance, the
Eight resistance, the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor are connected in series, twelfth resistor one end and height
The connection of pressure system output negative pole, the 8th resistance and the 9th resistance joint are connect with the 16th resistance one end, and the 16th resistance is another
One end is connect with the 15th resistance one end, the 15th resistance other end ground connection.
Type selecting of the present embodiment about partial pressure and current-limiting resistance are as follows: sampling resistor monomer 39k Ω 50W is calculated according to parameter,
16 in total, monomer bear maximum operating voltage 600V, select high-pressure glass glaze film resistance, the resistance quantity of the present embodiment be
Consider what the combined factors such as the space limitation in electric parameter, the pressure resistance of resistance monomer, dissipated power and specific equipment considered
As a result, other resistance quantity and the configuration of monomer specification equally can achieve effect.
In the present embodiment, the former and deputy side electric current no-load voltage ratio of LV100 voltage sensor are as follows: 10:25.Voltage passes when normal work
When sensor primary side high-pressure peak 6kV, as shown in Fig. 2, it is concatenated resistor network partial pressure and current limliting, voltage sensor primary side peak value electricity
Flow 7.7mA, secondary side peak point current 19.2mA.Electric power output voltage is through the first divider resistance module and the second divider resistance module group
At resistance current limliting network, voltage signal is converted into current signal, then through voltage sensor that current signal isolation amplification is defeated
Out；
Ignore voltage sensor primary side internal resistance, meanwhile, the 5th resistance and the 6th resistance in the second divider resistance series arm,
In parallel after first connecting with thirteenth resistor and the 14th resistance in third divider resistance series arm, total branch equivalent resistance is
Single resistance, the 7th resistance and the 8th resistance in the 5th divider resistance series arm, in the 6th divider resistance series arm
15th resistance and the 16th resistance are in parallel after first connecting, and total branch equivalent resistance is also single resistance, therefore, the electricity
Hindering current limliting equivalent network is still that 10 resistance are composed in series.But since there are series arm, voltage sensor primary current then becomes
It is original 1/2, therefore the relational expression that voltage sensor original edge voltage and secondary current are derived according to Ohm's law are as follows:
Wherein, uoFor output voltage virtual value, unit V, ioFor the proportional to output voltage of voltage sensor output
Current signal, unit A.It is reversed to count with this formula (2) and with the consideration of voltage sensor primary side rated current peak value 20mA range
Calculate the detectable peak-peak voltage 15.6kV of the detection circuit；According to " GB4943.1-2011 Information Technology Equipment safety the
A part: General Requirement " consider reversely to search with voltage sensor 6kV isolation voltage from safety angle, power port allows most
Peak voltage is 8.8kV.Under conditions of to sum up meeting device range and safety simultaneously, the peak-peak that power port allows is electric
Pressure is 8.8kV, and compared with equipment nominally exports crest voltage 6kV, there are 1.4~1.5 times of voltage detection margins.With embodiment
1 compares, and voltage sensor isolation voltage is constant, adjustment current-limiting resistance branch current so that entire circuit Zenith tracking range
It improves.
B point in Fig. 2 connects the earth, the resistance conduct of the first divider resistance series arm and third divider resistance series arm
The resistance conduct of the equalizing resistance, the 4th divider resistance series arm and the 6th divider resistance series arm of power port capacitor C1
The equalizing resistance of power port capacitor C2, wherein power supply output cathode connects through resistance R1, R2, R3, R4, R13, R14 and B point
The network of the earth is in parallel with capacitor C1.Power supply output negative pole connects the earth through resistance R12, R11, R10, R9, R16, R15 and B point
Network it is in parallel with capacitor C2.The increase of equalizing resistance be conducive to two groups of capacitor dynamic voltage balancings, especially load it is detuning after it is instantaneous
Spike high voltage.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of high_voltage isolation detection circuit of neutral earthing high-pressure system characterized by comprising voltage sensor, first
Divider resistance module and the second divider resistance module；
The input anode connection of the primary side of described first divider resistance module one end and voltage sensor, the first divider resistance mould
The block other end is connect with high-pressure system output cathode, the primary side input of described second divider resistance module one end and voltage sensor
Cathode connection, the second divider resistance module other end are connect with high-pressure system output negative pole, the first divider resistance mould
Block and the second divider resistance module are identical, are symmetrical arranged on current limliting bleeder circuit branch road.
2. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 1, which is characterized in that described
One divider resistance module is equipped with first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance, first partial pressure
The resistance being arranged in resistive module is connected in series；The second divider resistance module is equipped with the 6th resistance, the 7th resistance, the 8th
Resistance, the 9th resistance and the tenth resistance, the interior resistance being arranged of the second divider resistance module are connected in series.
3. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 1, which is characterized in that described
One divider resistance module is equipped with the first divider resistance series arm, the second divider resistance series arm and the series connection of third divider resistance
Branch, described first divider resistance series arm one end are connect with high-pressure system output cathode, the first divider resistance series connection
The branch other end and second divider resistance series arm one end are connected in series, the second divider resistance series arm other end with
The primary side input anode connection of voltage sensor, the first divider resistance series arm and the second divider resistance series arm connect
It meets place to connect with third divider resistance series arm one end, the third divider resistance series arm other end ground connection；
The second divider resistance module is equipped with the 4th divider resistance series arm, the 5th divider resistance series arm and the 6th point
Piezoresistance series arm, described 4th divider resistance series arm one end are connect with high-pressure system output negative pole, and described 4th point
The piezoresistance series arm other end and the 5th divider resistance series arm one end are connected in series, the 5th divider resistance series connection branch
The primary side of the road other end and voltage sensor inputs cathode connection, the 4th divider resistance series arm and the 5th divider resistance
Series arm junction is connect with the 6th divider resistance series arm one end, another termination of the 6th divider resistance series arm
Ground.
4. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 3, which is characterized in that described
One divider resistance series arm is equipped with first resistor, second resistance, 3rd resistor and the 4th resistance, the second divider resistance string
Join branch and be equipped with the 5th resistance and the 6th resistance, the third divider resistance series arm is equipped with thirteenth resistor and the 14th electricity
Resistance, described first resistor one end are connect with high-pressure system output cathode, the first resistor, second resistance, 3rd resistor, the 4th
Resistance, the 5th resistance and the 6th resistance are connected in series, and the primary side of described 6th resistance one end and voltage sensor inputs anode
The junction of connection, the 4th resistance and the 5th resistance is connect with thirteenth resistor one end, the thirteenth resistor other end
It is connect with the 14th resistance one end, the 14th resistance other end ground connection；
The 4th divider resistance series arm is equipped with the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor, described
5th divider resistance series arm is equipped with the 7th resistance and the 8th resistance, and the 6th divider resistance series arm is equipped with the 15th
The primary side input cathode connection of resistance and the 16th resistance, described 7th resistance one end and voltage sensor, the 7th resistance,
8th resistance, the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor are connected in series, the twelfth resistor one
End is connect with high-pressure system output negative pole, and the 8th resistance and the 9th resistance joint are connect with the 16th resistance one end, institute
It states the 16th resistance other end to connect with the 15th resistance one end, the 15th resistance other end ground connection.
5. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 1-4, feature exist
In the resistance uses high-pressure glass glaze film resistance.
6. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 1-4, feature exist
In voltage sensor pair side use ± 15V power supply, the voltage sensor, which is equipped with the electric current proportional to output voltage, to be believed
Number delivery outlet.
7. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 1-4, feature exist
In the voltage sensor uses isolation voltage for the voltage sensor of 6kV.
8. the high_voltage isolation detection circuit of neutral earthing high-pressure system according to claim 1-4, feature exist
In, be additionally provided with first capacitor and the second capacitor, the first capacitor anode is connect with high-pressure system output cathode, it is described first electricity
Hold cathode ground connection, and connect with the second capacitance cathode, the second capacitor cathode is connect with high-pressure system output negative pole.
9. according to claim 1, the high_voltage isolation detection circuit of the described in any item neutral earthing high-pressure systems in 2,5,6,7 or 8
Detection method, which is characterized in that include the following steps:
Electric power output voltage converts voltage signal through the first divider resistance module, voltage sensor and the second divider resistance module
For current signal；
The calculation relational expression of voltage sensor original edge voltage and secondary current are as follows:
Wherein, uoFor output voltage virtual value, unit V, ioFor the current signal of voltage sensor output, unit A, roFor
The resistance value of each resistance in first divider resistance module, the second divider resistance module.
10. according to claim 1, the high_voltage isolation of the described in any item neutral earthing high-pressure systems in 3,4,5,6,7 or 8 detects electricity
The detection method on road, which is characterized in that include the following steps:
The resistance current limliting network that electric power output voltage is formed through the first divider resistance module and the second divider resistance module, by voltage
Signal is converted to current signal, then amplification output is isolated in current signal through voltage sensor；
Ignore voltage sensor primary side internal resistance, the calculation relational expression of voltage sensor original edge voltage and secondary current signal are as follows:
Wherein, uoFor output voltage virtual value, unit V, ioFor the current signal of voltage sensor output, unit A, roFor
The resistance value of each resistance in first divider resistance module, the second divider resistance module.
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| CN201910887055.1A CN110470876B (en) | 2019-09-19 | 2019-09-19 | High-voltage isolation detection circuit and detection method of midpoint grounding high-voltage system |
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