CN109782145A - A kind of multiple-pin type Grounding Grids key parameter test device and method - Google Patents
A kind of multiple-pin type Grounding Grids key parameter test device and method Download PDFInfo
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Abstract
The invention discloses a kind of multiple-pin type Grounding Grids key parameter test device and method, which includes the grounding body discharge test device for measuring multiple-pin type Grounding Grids impulse resistance and the grounding body performance parameter testing device for measuring multiple-pin type Grounding Grids counterattack voltage；The earthed system of the earthed system and normal vertical grounding body composition that constitute respectively to multiple-pin type Grounding Grids carries out discharge test, the impulse earthed resistance for the earthed system that the earthed system and normal vertical grounding body for obtaining multiple-pin type Grounding Grids composition are constituted；The counterattack voltage of the earthed system that multiple-pin type Grounding Grids are constituted under different operating frequency and the earthed system that normal vertical grounding body is constituted is measured, and calculates the maximum value of counterattack voltage.The present invention is able to verify that the correctness and safety of the vertical earthed system structure of multiple-pin type.
Description
Technical field
This disclosure relates to a kind of multiple-pin type Grounding Grids key parameter test device and method.
Background technique
System in Substation is that substation is the general name for protecting Substation Electric Equipment safe operation, is divided into level and connects
Two kinds of patterns of ground system and vertical earthed system, according to material, different, structure difference is divided into many kinds to every kind of earthed system.
As the earthed system of electric system and the important salvo of electrical equipment, the correctness of the earthed system structure and
Safety plays a crucial role equipment and personal safety.Therefore, the multiple-pin type for how verifying building, which is vertically grounded, is
The correctness and safety for structure of uniting, are still technical problem to be solved.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, present disclose provides a kind of surveys of multiple-pin type Grounding Grids key parameter
Device and method is tried, is able to verify that the correctness and safety of the vertical earthed system structure of multiple-pin type.
Technical solution used by the disclosure is:
A kind of multiple-pin type Grounding Grids key parameter test device, the device include vertically being grounded for measuring multiple-pin type
The grounding body discharge test device of body impulse resistance and grounding body performance for measuring multiple-pin type Grounding Grids counterattack voltage
Parameter test device.
Further, the grounding body discharge test device includes high-voltage DC power supply, capacitor, sphere gap switch, adjustable electric
Resistance, oscillograph and high-voltage probe；
The high-voltage DC power supply is electrically connected with city, and the capacitor is connected in parallel with high-voltage DC power supply, passes through high straightening
Galvanic electricity source is connect to capacitor charge and discharge, one end of the sphere gap switch and capacitance connection, the other end with adjustable resistance, described adjustable
The other end of resistance is connect with multiple-pin type Grounding Grids, and one end of the high-voltage probe is connect with multiple-pin type Grounding Grids,
The other end is connect with oscillograph.
Further, the grounding body discharge test device further includes current probe, one end of the current probe and more
The connection of pin type Grounding Grids, the other end are connect with oscillograph.
Further, the high-voltage DC power supply includes concatenated automatic coupling voltage regulator, step-up transformer and voltage tripler rectifier
Circuit.
Further, the grounding body performance parameter testing device includes 5A simple sinusoidal alternating current source, low pressure probe and shows
Wave device, 5A simple sinusoidal alternating current source are connect with multiple-pin type Grounding Grids, and one end of the low pressure probe and multiple-pin type hang down
Directly body connects, and the other end is connect with oscillograph.
A kind of multiple-pin type Grounding Grids key parameter test method, this method are based on multiple-pin type as described above and vertically connect
What ground body key parameter test device was realized, method includes the following steps:
Respectively to multiple-pin type Grounding Grids constitute earthed system and normal vertical grounding body constitute earthed system into
Row discharge test, the earthed system that the earthed system and normal vertical grounding body for obtaining multiple-pin type Grounding Grids composition are constituted
Impulse earthed resistance；
Measure the earthed system and normal vertical grounding body composition that multiple-pin type Grounding Grids are constituted under different operating frequency
Earthed system counterattack voltage, and calculate the maximum value of counterattack voltage.
Further, the method that the earthed system constituted to multiple-pin type Grounding Grids carries out discharge test are as follows:
Grounding body discharge test device is built, multiple-pin type Grounding Grids are inserted in the soil；
The distance of each testing equipment in grounding body discharge test device is adjusted according to capacitor both ends maximum voltage value；
Docking conductive discharge experimental rig passes to the alternating current of 220V, charges to capacitor, after charging complete, closure rotation
Sphere gap switch discharges to multiple-pin type Grounding Grids；
Measurement acts on the voltage and current data on multiple-pin type Grounding Grids；
The voltage data on multiple-pin type Grounding Grids be will act on compared with current data, obtained more under each charging voltage
The impulse resistance of pin type Grounding Grids.
Further, the method that the earthed system constituted to common grounding body carries out discharge test are as follows:
Grounding body discharge test device is built, common grounding body is inserted in the soil；
The distance of each testing equipment in grounding body discharge test device is adjusted according to capacitor both ends maximum voltage value；
Docking conductive discharge experimental rig passes to the alternating current of 220V, charges to capacitor, after charging complete, closure rotation
Sphere gap switch discharges to multiple-pin type Grounding Grids；
Measurement acts on the voltage and current data on common grounding body；
The voltage data on common grounding body be will act on compared with current data, obtain commonly being grounded under each charging voltage
The impulse resistance of body.
Further, the earthed system that the earthed system and common grounding body for comparing multiple-pin type Grounding Grids composition are constituted
Impulse earthed resistance size；When the earthed system that multiple-pin type Grounding Grids are constituted is rained the ground connection system that common grounding body constitutes
The impulse earthed resistance of system, and as voltage increases, then multiple-pin type Grounding Grids are reasonable in design.
Further, the earthed system and normal vertical that multiple-pin type Grounding Grids are constituted under the different operating frequency connect
The method of the counterattack voltage for the earthed system that ground body is constituted are as follows:
It is tested using the earthed system that 5A simple sinusoidal alternating current source constitutes multiple-pin type Grounding Grids, utilizes low pressure
Counterattack voltage of the earthed system that probe measurement multiple-pin type Grounding Grids are constituted under different operating frequency；
It is tested using the earthed system that 5A simple sinusoidal alternating current source constitutes common grounding body, is popped one's head in and surveyed using low pressure
Measure counterattack voltage of the earthed system of common grounding body composition under different operating frequency；
Calculate separately multiple-pin type Grounding Grids composition earthed system counterattack voltage maximum value and common grounding body structure
At earthed system counterattack voltage maximum value, and the size both compared；
If the counterattack voltage maximum value for the earthed system that multiple-pin type Grounding Grids are constituted is less than what common grounding body was constituted
The counterattack voltage maximum value of earthed system, and be less than safe voltage, then the earthed system that multiple-pin type Grounding Grids are constituted is not
It is required with the person and equipment safety protection is reached under working frequency.
Through the above technical solutions, the beneficial effect of the disclosure is:
Impact electricity of the earthed system that the disclosure is made up of measurement multiple-pin type Grounding Grids under different charging voltages
Resistance is able to verify that the correctness of the structure design for the earthed system that multiple-pin type Grounding Grids are constituted；It is hung down by measurement multiple-pin type
Counterattack voltage maximum value of the earthed system that directly body is constituted under different operating frequency, is able to verify that multiple-pin type is vertically grounded
Whether system can reach the requirement of the person and equipment safety protection at the operating frequencies.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the application.
Fig. 1 is the structure chart of grounding body discharge test device；
Fig. 2 is the structure chart of grounding body performance parameter testing device；
Fig. 3 is the electric discharge figure of the vertical earthed system of multiple-pin type under 5.5kV charging voltage；
Fig. 4 is the electric discharge figure of common earthing system under 5.5kV charging voltage；
Fig. 5 is step voltage circuit diagram；
Fig. 6 is contact voltage circuit diagram；
Fig. 7 is the counterattack voltage figure under the conditions of 60MHz.
Specific embodiment
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms that the disclosure uses have logical with disclosure person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
One or more embodiments provide a kind of multiple-pin type Grounding Grids key parameter test device, which includes using
It is vertically grounded in the grounding body discharge test device of the impulse resistance of measurement multiple-pin type Grounding Grids and for measuring multiple-pin type
The grounding body performance parameter testing device of the counterattack voltage of body.
As shown in Figure 1, the grounding body discharge test device includes high-voltage DC power supply, capacitor, sphere gap switch, adjustable electric
Hinder Rt, oscillograph, current probe and high-voltage probe；The high-voltage DC power supply is electrically connected with the city of alternating current 220V, the capacitor
It is connected in parallel with high-voltage DC power supply, it should be to capacitor charge and discharge, one end of the sphere gap switch and electricity by high-voltage DC power supply
Hold connection, the other end and adjustable resistance RtConnection, the resistance RtThe other end and the ground connection that is made of multiple-pin type Grounding Grids
System connection, one end of the high-voltage probe and resistance RtWith the connecting line for the earthed system being made of multiple-pin type Grounding Grids
Road connection, the other end are connect with oscillograph, and measurement acts on the voltage on multiple-pin type Grounding Grids, and is transmitted to oscillograph；
The resistance RtIt is provided with current probe on the route connecting with multiple-pin type Grounding Grids, the current probe and oscillograph
Other end connection, for measuring the electric current acted on multiple-pin type Grounding Grids, and is transmitted to oscillograph.
In Fig. 1, sphere gap switch be it is rotary, when capacitor charging, open position is at, at this point, its resistance RtInaction
It is poor big；When capacitor discharges, it is on position, at this point, its resistance RtVery little is almost 0.
In the present embodiment, the high-voltage DC power supply includes concatenated automatic coupling voltage regulator, step-up transformer and three multiplication of voltages
Rectification circuit.The working principle of the high-voltage DC power supply is the alternating current of alternating current 220V, after automatic coupling voltage regulator, output 0~
The voltage of 250V, using a step-up transformer, output voltage is the alternating current of 0~20kV, then by voltage tripler rectifier electricity
Road is transformed into direct current electricity output, and the amplitude of voltage amplifies three times, i.e. 0~60kV of output negative pole high direct voltage.
As shown in Fig. 2, the grounding body performance parameter testing device includes 5A simple sinusoidal alternating current source device, low pressure probe
And oscillograph, the 5A simple sinusoidal alternating current source device are connect with multiple-pin type Grounding Grids, one end of low pressure probe with
5A simple sinusoidal alternating current source device is connected with the connection line of multiple-pin type Grounding Grids, and the other end is connect with oscillograph.It utilizes
5A simple sinusoidal alternating current source device carries out the vertical earthed system test of multiple-pin type, is vertically grounded using low pressure probe measurement multiple-pin type
Counterattack voltage of the system under different operating frequency.
The multiple-pin type Grounding Grids key parameter test device that the present embodiment proposes vertically is grounded by measuring multiple-pin type
Impulse resistance of the earthed system that body is constituted under different charging voltages is able to verify that the ground connection that multiple-pin type Grounding Grids are constituted
The correctness of the structure design of system；The earthed system being made up of measurement multiple-pin type Grounding Grids is under different operating frequency
Counterattack voltage maximum value, be able to verify that the vertical earthed system of multiple-pin type at the operating frequencies and whether can reach the person and equipment peace
The requirement of full guard.
One or more embodiments also provide a kind of multiple-pin type Grounding Grids key parameter test method, and this method is based on
What multiple-pin type Grounding Grids key parameter test device as described above was realized, method includes the following steps:
S101, multiple-pin type Grounding Grids discharge test.
When the biggish dash current of amplitude flows through Grounding Grids, since the spark of Grounding Grids surrounding soil is put
Electricity, ground resistance can change, and ground resistance at this time is known as impulse earthed resistance Rch, value is to act on vertical ground connection
The ratio of voltage peak and current peak on body, i.e. Rch=Um/Im.Impulse earthed resistance value is compared, can obtain spark discharge
Power.What the multiple-pin type Grounding Grids designed by impulsive discharge Experimental Comparison and normal vertical grounding body were constituted vertical connects
The impulse earthed resistance of ground system specifies the characteristic of multiple-pin type Grounding Grids, verifies the correctness of design.
Using capacitor charge and discharge simulated failure high current, i.e., with 60kV DC high-voltage power supply to the capacitor charging of 0.4 μ F, so
It is discharged by sphere gap switch subject multiple-pin type Grounding Grids, is acted on multiple-pin type Grounding Grids by measurement afterwards
Voltage and current, finally obtain impulse resistance.
In the step S101, the detailed process of multiple-pin type Grounding Grids discharge test are as follows:
S101-1, builds grounding body discharge test device, and multiple-pin type Grounding Grids and common grounding body are inserted in soil
In；
S101-2 adjusts each examination in multiple-pin type Grounding Grids discharge test device according to capacitor both ends maximum voltage value
The distance of equipment is tested, to meet the requirement of electric property；
S101-3, the connection of inspection multiple-pin type Grounding Grids discharge test device route, sees with the presence or absence of connection error,
The problems such as being not connected firmly；
S101-4 passes to the alternating current of 220V to entire multiple-pin type Grounding Grids discharge test device after inspection is errorless；
S101-5 presses and starts switch key on 60kV DC high-voltage power supply low voltage control case, slowly adjusts self-coupling
The adjusting pressuring knob of device boosts, finally make voltage reach as defined in stop boosting at charging voltage value, keep a period of time with
Ensure that capacitor charging is completed；The stop button on 60kV DC high-voltage power supply control cabinet is then pressed, while quick-make rotates
Sphere gap switch discharges to multiple-pin type Grounding Grids and normal vertical grounding body, and measurement acts on multiple-pin type Grounding Grids
On voltage and current data；
S101-6 acquires by oscillograph and records the voltage and current waveform number acted on multiple-pin type Grounding Grids
Accordingly and act on voltage and current Wave data on common grounding body；
S101-7 discharges to two multiple-pin type Grounding Grids discharge test devices；
S101-8 repeats step S101-2~S101-7, until test data has all been surveyed；
S101-9 calculates each charging electricity according to the voltage and current experimental data acted on multiple-pin type Grounding Grids
Depress the impulse resistance of multiple-pin type Grounding Grids；Number is tested according to the voltage and current acted on normal vertical grounding body
According to calculating the impulse resistance of common grounding body under each charging voltage.
Under the charging voltage tested with oscillograph in discharge process two multiple-pin type Grounding Grids discharge waveform class
Seemingly, typical waveform is as shown in Figure 3 and Figure 4.
In Fig. 3 and Fig. 4, channel 1 is the voltage acted in earthed system, and channel 2 is the voltage on charge and discharge capacitance, is led to
Road 3 is the electric current acted in earthed system.
The data export of waveform diagram in oscillograph, it is vertical to obtain two multiple-pin types under each charging voltage for processing in Origin
The directly impulse resistance R of bodych, the impulse resistance R of multiple-pin type Grounding Grids and normal vertical grounding bodychComparing result is such as
Shown in table 1.
The impulse resistance R of table 1 multiple-pin type Grounding Grids and normal vertical grounding bodychComparing result
| Charging voltage (kV) | 5.5 | 7.5 |
| Multiple-pin type Grounding Grids Rch(Ω) | 51.5 | 38.21 |
| Normal vertical grounding body Rch(Ω) | 77.9 | 61.37 |
As shown in Table 1, when high pressure acts on, the impulse earthed resistance for the earthed system that multiple-pin type Grounding Grids are constituted is much
Less than the impulse earthed resistance for the vertical earthed system that normal vertical grounding body is constituted, and with the raising (fault energy of voltage
Increase), the phenomenon is all the more obvious, sufficiently prove multiple-pin type Grounding Grids structure design correctness.
S102 is grounded step voltage and contact voltage test.
The specific implementation of the step 102 is as follows:
S102-1, step voltage and contact voltage analysis.
When people and the earth contact, there are contact resistances, if the contact resistance of single foot and soil is R0, human body resistance R1。
It knows when people and the earth are contacted by maximum stride potential UkWith potential rise UsThe step voltage and contact voltage generated in human body
Schematic diagram is as illustrated in Figures 5 and 6.
By Figures 5 and 6 it is found that flowing through the step voltage calculation formula of human body are as follows:
Contact voltage calculation formula are as follows:
The contact resistance R of people and the earth in formula (1) and (2)03 ρ are rule of thumb taken as, wherein ρ is the resistivity of contact layer；
The general value of human body resistance is 2000 Ω.Acted on it can be seen from above two formula human body step voltage and contact voltage with
The resistivity of contact layer is related, and the resistivity of contact layer is bigger, and step voltage and contact voltage will be smaller.
S102-2, different operating grounded at fre system performance testing.
The vertical earthed system of multiple-pin type is constructed respectively using multiple-pin type Grounding Grids, normal vertical grounding body, is commonly hung down
Directly system needs to ensure to work normally at the operating frequencies to the touch voltage and step voltage under its working frequency
It is tested.It researchs and analyses it is found that touch voltage and step voltage parameter is directly proportional to the counterattack voltage Us in equipment, because
This, the counterattack voltage when test of performance parameter is converted into measurement work in equipment.
In the present embodiment, it is hung down respectively to the multiple-pin type of building using multiple-pin type Grounding Grids performance parameter testing device
Directly the counterattack voltage of system, normal vertical earthed system under different operating frequency measures, and measures resulting counterattack
Voltage exemplary waveform diagram is illustrated in fig. 7 shown below.
By the data export of oscillograph storage, it is as shown in table 2 below to finally obtain counterattack voltage maximum value.
Counterattack voltage maximum value under 2 different operating frequency of table
As shown in Table 2, under working frequency 60MHz, compared with normal vertical earthed system, the vertical earthed system of multiple-pin type
Counterattack voltage it is smaller, and far smaller than safe voltage 24V.Therefore, the vertical earthed system of multiple-pin type can reach at the operating frequencies
It is qualified to the requirement of the person and equipment safety protection.
The multiple-pin type Grounding Grids key parameter test method that the present embodiment proposes vertically is grounded by measuring multiple-pin type
Impulse resistance of the earthed system that body is constituted under different charging voltages is able to verify that the ground connection that multiple-pin type Grounding Grids are constituted
The correctness of the structure design of system；The earthed system being made up of measurement multiple-pin type Grounding Grids is under different operating frequency
Counterattack voltage maximum value, be able to verify that the vertical earthed system of multiple-pin type at the operating frequencies and whether can reach the person and equipment peace
The requirement of full guard.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of multiple-pin type Grounding Grids key parameter test device, characterized in that the device includes for measuring multiple-pin type
The grounding body discharge test device of Grounding Grids impulse resistance and for measuring connecing for multiple-pin type Grounding Grids counterattack voltage
Ground body performance parameter testing device.
2. multiple-pin type Grounding Grids key parameter test device according to claim 1, characterized in that the grounding body
Discharge test device includes high-voltage DC power supply, capacitor, sphere gap switch, adjustable resistance, oscillograph and high-voltage probe；
The high-voltage DC power supply is electrically connected with city, and the capacitor is connected in parallel with high-voltage DC power supply, passes through high voltage direct current
Source is connect to capacitor charge and discharge, one end of the sphere gap switch and capacitance connection, the other end with adjustable resistance, the adjustable resistance
The other end connect with multiple-pin type Grounding Grids, one end of the high-voltage probe is connect with multiple-pin type Grounding Grids, another
End is connect with oscillograph.
3. multiple-pin type Grounding Grids key parameter test device according to claim 2, characterized in that the grounding body
Discharge test device further includes current probe, and one end of the current probe is connect with multiple-pin type Grounding Grids, the other end with
Oscillograph connection.
4. multiple-pin type Grounding Grids key parameter test device according to claim 1, characterized in that the high straightening
Galvanic electricity source includes concatenated automatic coupling voltage regulator, step-up transformer and voltage tripler rectifier circuit.
5. multiple-pin type Grounding Grids key parameter test device according to claim 1, characterized in that the grounding body
Performance parameter testing device include 5A simple sinusoidal alternating current source, low pressure probe and oscillograph, 5A simple sinusoidal alternating current source with
One end of the connection of multiple-pin type Grounding Grids, the low pressure probe is connect with multiple-pin type Grounding Grids, the other end and oscillograph
Connection.
6. a kind of multiple-pin type Grounding Grids key parameter test method, this method is based on described in any one of claim 1-5
Multiple-pin type Grounding Grids key parameter test device realize, characterized in that method includes the following steps:
The earthed system of the earthed system and normal vertical grounding body composition that constitute respectively to multiple-pin type Grounding Grids is put
Electric test, the impact for the earthed system that the earthed system and normal vertical grounding body for obtaining multiple-pin type Grounding Grids composition are constituted
Ground resistance；
What the earthed system and normal vertical grounding body that multiple-pin type Grounding Grids are constituted under measurement different operating frequency were constituted connects
The counterattack voltage of ground system, and calculate the maximum value of counterattack voltage.
7. multiple-pin type Grounding Grids key parameter test method according to claim 6, characterized in that described to spininess
The method that the earthed system that formula Grounding Grids are constituted carries out discharge test are as follows:
Grounding body discharge test device is built, multiple-pin type Grounding Grids are inserted in the soil；
The distance of each testing equipment in grounding body discharge test device is adjusted according to capacitor both ends maximum voltage value；
Docking conductive discharge experimental rig passes to the alternating current of 220V, charges to capacitor, after charging complete, is closed screw gap
Switch discharges to multiple-pin type Grounding Grids；
Measurement acts on the voltage and current data on multiple-pin type Grounding Grids；
The voltage data on multiple-pin type Grounding Grids be will act on compared with current data, obtain multiple-pin type under each charging voltage
The impulse resistance of Grounding Grids.
8. multiple-pin type Grounding Grids key parameter test method according to claim 6, characterized in that described to common
The method that the earthed system that grounding body is constituted carries out discharge test are as follows:
Grounding body discharge test device is built, common grounding body is inserted in the soil；
The distance of each testing equipment in grounding body discharge test device is adjusted according to capacitor both ends maximum voltage value；
Docking conductive discharge experimental rig passes to the alternating current of 220V, charges to capacitor, after charging complete, is closed screw gap
Switch discharges to multiple-pin type Grounding Grids；
Measurement acts on the voltage and current data on common grounding body；
The voltage data on common grounding body be will act on compared with current data, obtain common grounding body under each charging voltage
Impulse resistance.
9. multiple-pin type Grounding Grids key parameter test method according to claim 6, characterized in that compare multiple-pin type
The impulse earthed resistance size for the earthed system that the earthed system and common grounding body that Grounding Grids are constituted are constituted；Work as multiple-pin type
The earthed system that Grounding Grids are constituted is rained the impulse earthed resistance of earthed system that common grounding body is constituted, and with voltage
It increases, then multiple-pin type Grounding Grids are reasonable in design.
10. multiple-pin type Grounding Grids key parameter test method according to claim 6, characterized in that the difference
The counterattack for the earthed system that the earthed system and normal vertical grounding body that multiple-pin type Grounding Grids are constituted under working frequency are constituted
The method of voltage are as follows:
It is tested using the earthed system that 5A simple sinusoidal alternating current source constitutes multiple-pin type Grounding Grids, is popped one's head in using low pressure
Measure counterattack voltage of the earthed system of multiple-pin type Grounding Grids composition under different operating frequency；
It is tested using the earthed system that 5A simple sinusoidal alternating current source constitutes common grounding body, it is general using low pressure probe measurement
Counterattack voltage of the earthed system that logical grounding body is constituted under different operating frequency；
What the counterattack voltage maximum value and common grounding body for calculating separately the earthed system of multiple-pin type Grounding Grids composition were constituted
The counterattack voltage maximum value of earthed system, and compare the size of the two；
If the counterattack voltage maximum value for the earthed system that multiple-pin type Grounding Grids are constituted is less than the ground connection that common grounding body is constituted
The counterattack voltage maximum value of system, and be less than safe voltage, then the earthed system that multiple-pin type Grounding Grids are constituted is in different works
Reach the person under working frequency and equipment safety protection requires.
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