CN109633357A - More busbar grounding insulated monitoring methods and monitoring device in triple bus-bar - Google Patents
More busbar grounding insulated monitoring methods and monitoring device in triple bus-bar Download PDFInfo
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- CN109633357A CN109633357A CN201910023603.6A CN201910023603A CN109633357A CN 109633357 A CN109633357 A CN 109633357A CN 201910023603 A CN201910023603 A CN 201910023603A CN 109633357 A CN109633357 A CN 109633357A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention provides more busbar grounding insulated monitoring methods and monitoring device in a kind of triple bus-bar, and monitoring method between reference point and ground the following steps are included: be arranged constant pressure source；It is detected respectively when constant pressure source takes positive setting value, 0V and negative setting value respectively, each bus takes positive setting value, 0V and each bus of negative setting value to calculate each bus to ground resistance to the sum of the virtual voltage of reference point and the leakage current of all buses respectively to the sum of the virtual voltage of reference point and leakage current of all buses, and according to constant pressure source.Technical solution provided by the invention, taken respectively according to constant pressure source each bus when positive setting value, 0V and negative setting value to the sum of the virtual voltage of reference point and leakage current of all buses calculate each bus to ground resistance, parameter measurement and calculation method are all fairly simple, are able to solve the problem of insulated monitoring method in the prior art can not be monitored the insulation situation in positive bus-bar, negative busbar, zero bus triple bus-bar when more busbar groundings.
Description
Technical field
The invention belongs to busbar grounding technical field of insulation detection more in triple bus-bar, and in particular to mostly female in a kind of triple bus-bar
Line ground insulation monitoring method and monitoring device.
Background technique
The direct current system that energy storage substation is made of three sections of buses, three sections of buses are respectively positive bus-bar, negative busbar, zero mother
Line, bus needed for thering is between any two sections of buses pressure difference, load to choose according to demand.
Energy storage substation is using high pressure group battery as power source, with the extensive development of energy storage substation, high pressure group electricity
The voltage class in pond is higher and higher, and the electric energy stored is increasing, once Insulation Problems, which occur, will seriously threaten user
It is safe with electrical equipment, therefore the security of the lives and property in order to guarantee user, need the exhausted of three sections of buses of monitoring promptly and accurately
Reason barrier.
Common insulating monitoring mode is relatively more, such as signal injection method, amperometr iotac sensing, balance bridge method etc., these three
Method is to monitor the insulating monitoring situation of positive and negative double-bus, just for positive bus-bar, negative busbar, this triple bus-bar situation of zero bus
Insulating ground position cannot be oriented.
Summary of the invention
The purpose of the present invention is to provide busbar grounding insulated monitoring methods more in a kind of triple bus-bar and monitoring devices, are used for
Solving insulated monitoring method in the prior art can not be in positive bus-bar, negative busbar, zero bus triple bus-bar when more busbar groundings
Insulation situation the problem of being monitored.
To achieve the above object, present invention provide the technical scheme that
More busbar grounding insulated monitoring methods in a kind of triple bus-bar, comprising the following steps:
(1) constant pressure source is set between reference point and ground；
(2) it detects respectively when constant pressure source takes positive setting value, 0V and negative setting value respectively, reality of each bus to reference point
The sum of voltage and the leakage current of all buses, and take positive setting value, 0V and each bus of negative setting value to ginseng respectively according to constant pressure source
The sum of leakage current of the virtual voltage of examination point and all buses calculates each bus to ground resistance.
Technical solution provided by the invention, each bus when taking positive setting value, 0V and negative setting value respectively according to constant pressure source
The sum of virtual voltage and the leakage current of all buses to reference point calculate each bus to ground resistance, parameter measurement and calculating
Method is all fairly simple, and being able to solve insulated monitoring method in the prior art can not be female to positive bus-bar, negative busbar, zero bus three
The problem of insulation situation in line when more busbar groundings is monitored.
Further, calculation formula of each bus to ground resistance are as follows:
R in above formulax、Ry、RzRespectively positive bus-bar, zero bus and negative busbar to ground resistance, Up1、Uz1、Un1It is respectively permanent
The virtual voltage of positive bus-bar, zero bus and negative busbar to reference point, U when potential source takes positive setting valuep2、Uz2、Un2Respectively constant pressure source
The virtual voltage of positive bus-bar, zero bus and negative busbar to reference point, U when taking 0Vp3、Uz3、Un3Respectively constant pressure source takes negative setting value
When virtual voltage to reference point of positive bus-bar, zero bus and negative busbar, I1Positive bus-bar, zero bus when taking positive setting value for constant pressure source
The sum of with the leakage current of negative busbar, I2The sum of positive bus-bar, zero bus and leakage current of negative busbar, I when taking 0V for constant pressure source3
The sum of positive bus-bar, zero bus and leakage current of negative busbar when taking negative setting value for constant pressure source.
Further, when there is when being less than corresponding threshold value to ground resistance of bus, it is judged as the busbar grounding.
By the bus of each bus being grounded to ground resistance with corresponding threshold decision, judging result is more convenient and quasi-
True property is high.
Further, repeatedly calculate each bus to ground resistance, if continuous setting time calculates the electric over the ground of each bus
Variable quantity is hindered less than the second setting value, then using primary calculated result any in setting time as each bus to ground resistance.
Repeatedly calculate each bus to ground resistance, can prevent from causing to obtain due to there is temporary derangement in test process
Each bus the mistake of resistance value over the ground problem.
Further, after constant pressure source being set between reference point and ground, the voltage of constant pressure source is set as zero, then detection is each
The voltage-to-ground of bus thens follow the steps (2) if there is the voltage-to-ground variable quantity of bus is greater than the first setting value.
When the voltage of constant pressure source is zero and has the voltage-to-ground variable quantity of bus to be greater than the first setting value, can determine whether to have
Busbar grounding, judges to have and executes step (2) when busbar grounding again, can reduce calculation amount.
More busbar grounding insulation monitoring devices in a kind of triple bus-bar, including memory, processor and it is stored in described deposit
In reservoir and the computer program that can run on a processor, the processor execute the process realized when the computer program
The following steps are included:
(1) constant pressure source is set between reference point and ground；
(2) it detects respectively when constant pressure source takes positive setting value, 0V and negative setting value respectively, reality of each bus to reference point
The sum of voltage and the leakage current of all buses, and take positive setting value, 0V and each bus of negative setting value to ginseng respectively according to constant pressure source
The sum of leakage current of the virtual voltage of examination point and all buses calculates each bus to ground resistance.
Technical solution provided by the invention, each bus when taking positive setting value, 0V and negative setting value respectively according to constant pressure source
The sum of virtual voltage and the leakage current of all buses to reference point calculate each bus to ground resistance, parameter measurement and calculating
Method is all fairly simple, and being able to solve insulated monitoring method in the prior art can not be female to positive bus-bar, negative busbar, zero bus three
The problem of insulation situation in line when more busbar groundings is monitored.
Further, calculation formula of each bus to ground resistance are as follows:
R in above formulax、Ry、RzRespectively positive bus-bar, zero bus and negative busbar to ground resistance, Up1、Uz1、Un1It is respectively permanent
The virtual voltage of positive bus-bar, zero bus and negative busbar to reference point, U when potential source takes positive setting valuep2、Uz2、Un2Respectively constant pressure source
The virtual voltage of positive bus-bar, zero bus and negative busbar to reference point, U when taking 0Vp3、Uz3、Un3Respectively constant pressure source takes negative setting value
When virtual voltage to reference point of positive bus-bar, zero bus and negative busbar, I1Positive bus-bar, zero bus when taking positive setting value for constant pressure source
The sum of with the leakage current of negative busbar, I2The sum of positive bus-bar, zero bus and leakage current of negative busbar, I when taking 0V for constant pressure source3
The sum of positive bus-bar, zero bus and leakage current of negative busbar when taking negative setting value for constant pressure source.
Further, when there is when being less than corresponding threshold value to ground resistance of bus, it is judged as the busbar grounding.
By the bus of each bus being grounded to ground resistance with corresponding threshold decision, judging result is more convenient and quasi-
True property is high.
Further, repeatedly calculate each bus to ground resistance, if continuous setting time calculates the electric over the ground of each bus
Variable quantity is hindered less than the second setting value, then using primary calculated result any in setting time as each bus to ground resistance.
Repeatedly calculate each bus to ground resistance, can prevent from causing to obtain due to there is temporary derangement in test process
Each bus the mistake of resistance value over the ground problem.
Further, after constant pressure source being set between reference point and ground, the voltage of constant pressure source is set as zero, then detection is each
The voltage-to-ground of bus thens follow the steps (2) if there is the voltage-to-ground variable quantity of bus is greater than the first setting value.
When the voltage of constant pressure source is zero and has the voltage-to-ground variable quantity of bus to be greater than the first setting value, can determine whether to have
Busbar grounding, judges to have and executes step (2) when busbar grounding again, can reduce calculation amount.
Detailed description of the invention
Fig. 1 is the insulating monitoring schematic diagram of triple bus-bar ground connection in embodiment of the present invention method；
Fig. 2 is triple bus-bar leakage current detection schematic diagram in embodiment of the present invention method.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
Embodiment of the method:
The present embodiment provides busbar grounding insulated monitoring methods more in a kind of triple bus-bar, for positive bus-bar, negative busbar, zero
Insulation situation in bus triple bus-bar when more busbar groundings is monitored, to guarantee the safety of the accessed direct current system of triple bus-bar
Property.
More busbar grounding insulated monitoring methods, include the following steps: in triple bus-bar provided by the present embodiment
(1) constant pressure source is set between reference point and ground, under normal condition, sets 0V for constant pressure source.
(2) when constant pressure source is 0V, the voltage-to-ground of each bus is detected, is judged whether according to the variable quantity of each busbar voltage
There are busbar grounding, the method for judgement are as follows: if there is the variable quantity of Bus Voltage to be greater than the first setting value in triple bus-bar, sentence
Break to there is busbar grounding in triple bus-bar；The first setting value is 5V in the present embodiment, i.e., has the change of Bus Voltage in triple bus-bar
When change amount is greater than 5V, being judged as in triple bus-bar has busbar grounding.
(3) when there is busbar grounding, calculate each bus to ground resistance, calculation method are as follows:
Be positive setting value, 0V and negative setting value is arranged in constant pressure source, detects each bus respectively to the virtual voltage of reference point
The sum of with the leakage current of all buses, and while taking according to constant pressure source positive setting value, 0V and negative setting value respectively each bus is to reference
The sum of virtual voltage and the leakage current of all buses of point calculate each bus to ground resistance.
More busbar grounding insulated monitoring methods in triple bus-bar provided by the present embodiment, when being detected to triple bus-bar,
Detection principle diagram is as shown in Figure 1, Vp, Vz, Vn are respectively to detect positive bus-bar, zero bus and negative busbar to the reality of reference point in Fig. 1
The voltmeter of border voltage, Vs are constant pressure source, Rx、Ry、RzAccess electricity respectively between positive bus-bar, zero bus and negative busbar and ground
Resistance, i.e., positive bus-bar, zero bus and negative busbar to ground resistance；Rp、Ro、RnRespectively positive bus-bar, zero bus and negative busbar and reference
Access resistance between point；If Up、U0、UnBe positive setting value, 0V and negative setting value respectively.
Be positive setting value, 0V and negative setting value is arranged in constant pressure source, detects each bus to the virtual voltage of reference point and institute
There is the sum of the leakage current of bus, as shown in Fig. 2, the method for leakage current detection are as follows: each branch power end in electricity system
Leakage current sensor, i.e. current transformer are arranged on positive route and anode circuit；It, should if branch does not have leakage current
Branch anode route and the electric current of anode circuit are equal, and leakage current sensor will not generate induced current；When grounding,
When the branch will have leakage current, the electric current of the branch anode route and anode circuit is unequal, and leakage current sensor will
Induced current can be generated, therefore the primary side of leakage current sensor is arranged on the route of three busbar connection systems, i.e.,
It can detect that the sum of the leakage current of all buses.
When constant pressure source Vs takes positive setting value, positive bus-bar, zero bus and negative busbar are respectively to the virtual voltage of reference point
Up1、Uz1、Un1, the leakage current of positive bus-bar, zero bus and negative busbar is respectively Irp1、Irz1、Irn1；
When constant pressure source Vs takes 0V, positive bus-bar, zero bus and negative busbar are respectively U to the virtual voltage of reference pointp2、Uz2、
Un2, the leakage current of positive bus-bar, zero bus and negative busbar is respectively Irp2、Irz2、Irn2；
When constant pressure source Vs takes negative setting value, positive bus-bar, zero bus and negative busbar are respectively to the virtual voltage of reference point
Up3、Uz3、Un3, the leakage current of positive bus-bar, zero bus and negative busbar is respectively Irp3、Irz3、Irn3；
If
I1=Irp1+Irz1+Irn1
I2=Irp2+Irz2+Irn2
I3=Irp3+Irz3+Irn3
I1、I2And I3It can directly be detected and be obtained by leakage current sensor.It is adopted when calculating earth bus to ground resistance
Calculation formula are as follows:
In order to improve the accuracy to each bus resistance calculations over the ground, in the present embodiment when judging has busbar grounding,
Repeated detection and calculate each bus to ground resistance, if continuously setting number calculate each bus resistance change over the ground it is small
In the second setting value, then calculated result arbitrarily primary in number will be set as each bus to ground resistance.Such as when setting time
Number is three times, and second when set number as 5%, if the continuous resistance change over the ground for detecting calculated each bus three times is small
In 5%, then illustrate that this mistake does not occur in detecting three times, using any primary testing result as each bus to ground resistance
?.
Positive setting value and negative setting value in the present embodiment are determined according to the voltage class of bus, under normal circumstances, are just set
The order of magnitude of definite value and negative setting value is equal, and positive setting value is positive number, and negative setting value is negative, and positive setting value is set with negative
The size of definite value absolute value within the 10% of voltage class, be such as 110V for positive pole line voltage, negative busbar voltage be-
110V, the triple bus-bar that zero busbar voltage is 0V, can take positive setting value is 10V, and negative setting value is -10V.
Calculate each bus to ground resistance after, each bus is judged to connect with corresponding threshold value comparison to ground resistance
Ground bus, if calculate positive bus-bar to ground resistance RxLess than the corresponding threshold value of positive bus-bar, then it is judged as that positive bus-bar is grounded, such as
Fruit calculate zero bus to ground resistance RyLess than the corresponding threshold value of zero bus, then it is judged as zero busbar grounding, if calculated
Negative busbar to ground resistance RzLess than the corresponding threshold value of negative busbar, then it is judged as that negative busbar is grounded.
In order to determine the branch being grounded in system, when judging earth bus, the electric leakage of each branch in detection system
Electric current；If certain branch in system is judged as the grounding there are leakage current.
In the present embodiment, first judges whether there is busbar grounding according to the variable quantity of each Bus Voltage, then count again
Calculate each bus to ground resistance, thus when obtaining busbar grounding each bus ground resistance；It, can be with as other embodiments
Busbar grounding is not judged whether there is, the ground resistance of each bus is directly calculated.
Installation practice:
The present embodiment provides busbar grounding insulation monitoring devices more in a kind of triple bus-bar, including memory, processor and
The computer program that can be run in memory and on a processor is stored, processor is realized when executing the computer program
It states in embodiment of the method in triple bus-bar the step of more busbar grounding insulated monitoring methods.
Claims (10)
1. more busbar grounding insulated monitoring methods in a kind of triple bus-bar, which comprises the following steps:
(1) constant pressure source is set between reference point and ground；
(2) it detects respectively when constant pressure source takes positive setting value, 0V and negative setting value respectively, virtual voltage of each bus to reference point
The sum of with the leakage current of all buses, and take positive setting value, 0V and each bus of negative setting value to reference point respectively according to constant pressure source
Virtual voltage and the sum of the leakage currents of all buses calculate each bus to ground resistance.
2. more busbar grounding insulated monitoring methods in triple bus-bar according to claim 1, which is characterized in that each bus is over the ground
The calculation formula of resistance are as follows:
R in above formulax、Ry、RzRespectively positive bus-bar, zero bus and negative busbar to ground resistance, Up1、Uz1、Un1Respectively constant pressure source
The virtual voltage of positive bus-bar, zero bus and negative busbar to reference point, U when taking positive setting valuep2、Uz2、Un2Respectively constant pressure source takes 0V
When virtual voltage to reference point of positive bus-bar, zero bus and negative busbar, Up3、Uz3、Un3When respectively constant pressure source takes negative setting value just
The virtual voltage of bus, zero bus and negative busbar to reference point, I1Positive bus-bar when taking positive setting value for constant pressure source, zero bus and negative
The sum of leakage current of bus, I2The sum of positive bus-bar, zero bus and leakage current of negative busbar, I when taking 0V for constant pressure source3For perseverance
The sum of positive bus-bar, zero bus and leakage current of negative busbar when potential source takes negative setting value.
3. more busbar grounding insulated monitoring methods in triple bus-bar according to claim 1, which is characterized in that when there is bus
When being less than corresponding threshold value to ground resistance, it is judged as the busbar grounding.
4. more busbar grounding insulated monitoring methods in triple bus-bar according to claim 1, which is characterized in that repeatedly calculate each
Bus to ground resistance, will if continuous setting time calculates the resistance change over the ground of each bus less than the second setting value
Any primary calculated result is as each bus to ground resistance in setting time.
5. more busbar grounding insulated monitoring methods in triple bus-bar according to claim 1, which is characterized in that reference point with
After constant pressure source is set between ground, the voltage of constant pressure source is set as zero, the voltage-to-ground of each bus is then detected, if there is bus
Voltage-to-ground variable quantity is greater than the first setting value, thens follow the steps (2).
6. more busbar grounding insulation monitoring devices in a kind of triple bus-bar, including memory, processor and it is stored in the storage
In device and the computer program that can run on a processor, which is characterized in that when the processor executes the computer program
The process of realization the following steps are included:
(1) constant pressure source is set between reference point and ground；
(2) it detects respectively when constant pressure source takes positive setting value, 0V and negative setting value respectively, virtual voltage of each bus to reference point
The sum of with the leakage current of all buses, and take positive setting value, 0V and each bus of negative setting value to reference point respectively according to constant pressure source
Virtual voltage and the sum of the leakage currents of all buses calculate each bus to ground resistance.
7. more busbar grounding insulation monitoring devices in triple bus-bar according to claim 6, which is characterized in that each bus is over the ground
The calculation formula of resistance are as follows:
R in above formulax、Ry、RzRespectively positive bus-bar, zero bus and negative busbar to ground resistance, Up1、Uz1、Un1Respectively constant pressure source
The virtual voltage of positive bus-bar, zero bus and negative busbar to reference point, U when taking positive setting valuep2、Uz2、Un2Respectively constant pressure source takes 0V
When virtual voltage to reference point of positive bus-bar, zero bus and negative busbar, Up3、Uz3、Un3When respectively constant pressure source takes negative setting value just
The virtual voltage of bus, zero bus and negative busbar to reference point, I1Positive bus-bar when taking positive setting value for constant pressure source, zero bus and negative
The sum of leakage current of bus, I2The sum of positive bus-bar, zero bus and leakage current of negative busbar, I when taking 0V for constant pressure source3For perseverance
The sum of positive bus-bar, zero bus and leakage current of negative busbar when potential source takes negative setting value.
8. more busbar grounding insulation monitoring devices in triple bus-bar according to claim 6, which is characterized in that when there is bus
When being less than corresponding threshold value to ground resistance, it is judged as the busbar grounding.
9. more busbar grounding insulation monitoring devices in triple bus-bar according to claim 6, which is characterized in that repeatedly calculate each
Bus to ground resistance, will if continuous setting time calculates the resistance change over the ground of each bus less than the second setting value
Any primary calculated result is as each bus to ground resistance in setting time.
10. more busbar grounding insulation monitoring devices in triple bus-bar according to claim 6, which is characterized in that in reference point
After constant pressure source is set between ground, the voltage of constant pressure source is set as zero, the voltage-to-ground of each bus is then detected, if there is bus
Voltage-to-ground variable quantity be greater than the first setting value, then follow the steps (2).
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| CN201910023603.6A CN109633357B (en) | 2019-01-10 | 2019-01-10 | Method and device for monitoring grounding insulation of multiple buses in three buses |
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| CN111426981A (en) * | 2020-04-27 | 2020-07-17 | 江苏图腾电气科技有限公司 | Fault detection method for anti-creeping current power cabinet |
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