CN201583597U - Adjustable ground screen resistance testing device - Google Patents
Adjustable ground screen resistance testing device Download PDFInfo
- Publication number
- CN201583597U CN201583597U CN2010200623033U CN201020062303U CN201583597U CN 201583597 U CN201583597 U CN 201583597U CN 2010200623033 U CN2010200623033 U CN 2010200623033U CN 201020062303 U CN201020062303 U CN 201020062303U CN 201583597 U CN201583597 U CN 201583597U
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- gtb
- relay
- pressure regulator
- switch
- earth mat
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Abstract
The utility model relates to a ground screen resistance testing instrument for power consumers, in particular to an adjustable ground screen resistance testing device. The adjustable ground screen resistance testing device is characterized by comprising an isolating voltage regulator (GTB), two ends of an output winding of the isolating voltage regulator (GTB) are respectively connected with a first testing end (C) and a third testing end (E), wherein a voltmeter (V) is parallelly connected between the third testing end (E) and a second testing end (P), an amperemeter (A) is mounted between one end of the output winding of the isolating voltage regulator (GTB) and the first testing end (C) through a current transformer, and two ends of an input winding of the isolating voltage regulating (GTB) are connected with a power source through a switch control unit. The adjustable ground screen resistance testing device can meet requirements of tests of large ground screen resistance at any regions, can increase test voltage when testing ground screens with high soil rate at high altitude regions and complete test to resistance of ground screens with high soil humidity at relatively low altitude regions via relatively low voltage due to continuously adjustable voltage.
Description
Technical field
The utility model relates to a kind of power consumer earth mat resistance test instrument, especially adjustable earth mat resistance test device.
Background technology
The ground connection of sending out electric power system is the critical facility that guarantees personal safety and electrical equipment safety and over-pressure safety device operate as normal, and earthing device is to guarantee electrical equipment under normal and failure condition, can both be reliably and one of the main safeguard measure of safe operation.Earth mat resistance test instrument belongs to power test instrument category, be used to measure send out, the test of the earth mat resistance of power supply and other power consumer.
According to existing testing tool,, still homemade no matter be external, because the instrument output voltage is lower, lower at height above sea level, the earth mat in the place of soil humidity can meet the demands substantially, run into high height above sea level arid tract because the resistivity of soil is higher, earth mat just can't be measured.
The utility model content
The utility model relates to a kind of Adjustable Output Voltage, can satisfy any region, the adjustable earth mat resistance test device that especially high height above sea level, high soil rate earth mat resistance test require.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of adjustable earth mat resistance test device, its special feature is, comprise the isolation pressure regulator, the output winding two ends of this isolation pressure regulator are connected with the 3rd test lead with first test lead respectively, a voltage table in parallel between the 3rd test lead and second test lead wherein, by current transformer reometer is installed between the end of isolating pressure regulator output winding and first test lead, the input winding two ends that isolate pressure regulator are connected with power supply by switch control unit.
Wherein switch control unit is the relay latching circuit.
Its repeat circuit latching circuit comprises two pairs of normally opened contacts that are connected on respectively in the switch relay main contacts of isolating between pressure regulator input winding two ends and the power supply, a pair of normally opened contact and one is often opened to connect with the coil of a normally closed button and switch relay after the button parallel connection again and is constituted on-off circuit in the auxiliary contact of this switch relay, and this on-off circuit is connected in parallel on both ends of power.
Wherein between end of the isolation pressure regulator output winding that links to each other and the 3rd test lead, by current transformer current relay is installed, deenergization when electric current is excessive thereby a pair of normally closed contact of this current relay is connected with the coil of switch relay.
Wherein also be parallel with a time relay, thereby a pair of normally closed contact of this time relay is connected with the coil of switch relay and is being crossed deenergization when keeping greatly electric current in long-time at both ends of power.
Wherein travel switch is installed, thereby the trip switch is connected with the coil of switch relay prevent the bringing onto load combined floodgate that the pressure regulator contact does not take place when zero-bit at the coil initial position of isolating pressure regulator.
The utility model can satisfy the test of any region geodetic network resistance, because voltage is adjustable continuously, run into the earth mat test of high height above sea level, high soil rate, this instrument can be heightened trial voltage, and running into the area that height above sea level is lower, soil moisture is big only needs small voltage just can finish the test of earth mat resistance.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model;
The schematic diagram of accompanying drawing 2 for measuring with the utility model.
Embodiment
Geodetic network in the utility model (earth mat) refers to generating plant, power supply administration and other lays bigger earth mat with electric power system, the grounding body resistance that does not comprise single chimney, lightning rod and buildings, but this device also can satisfy the measurement of these grounding body stake resistances.
Come the utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, the utility model device comprises isolates pressure regulator GTB, these output winding two ends that isolate pressure regulator GTB are electrically connected with the first test lead C and the 3rd test lead E respectively, a voltage table V in parallel between the 3rd test lead E and the second test lead P wherein, by current transformer reometer A is installed between the end of the output of pressure regulator GTB and the first test lead C, the input winding two ends that isolate pressure regulator GTB are connected with power supply by switch control unit.
Switch control unit adopts the relay latching circuit, also can adopt simpler regular tap certainly.
Be illustrated in figure 1 as a kind of typical relay latching circuit, comprise and be connected on the input winding two ends that isolate pressure regulator GTB respectively and the main contacts of two couples of switch relay C between the power supply is normally opened contact C-1, C-2, a pair of normally opened contact C-3 and one often opens to connect with the coil of a normally closed button TN and switch relay C after the button HN parallel connection again and constitutes on-off circuit in the auxiliary contact of this switch relay C, and this on-off circuit is connected in parallel on both ends of power.
Between end of the output winding of the isolation pressure regulator GTB that links to each other and the 3rd test lead E, current relay IJ is installed in addition, the deenergization when electric current is excessive thereby a pair of normally closed contact IJ-1 of this current relay IJ connects with the coil of switch relay C, in test process, current relay IJ coil tandem is in the earth resistance current return, when electric current reaches 32A, current relay IJ action, its normally closed contact IJ-1 opens, make the coil loss of excitation of switch relay C, its normally opened contact recovers, thereby alternating current input power supplying is disconnected.
Also be parallel with a time relay sj at both ends of power, thereby a pair of normally closed contact SJ-1 of this time relay sj connects with the coil of switch relay C and is crossing deenergization when keeping greatly electric current in long-time, cross the big electric current of long-time adding when preventing to test, make the instrument heating burnout.So during test, require when electric current reaches test request time relay sj in time to be dropped into, it is 30～60 seconds that the time generally adjusts.
In initial (voltage null value) position of the coil of isolating pressure regulator GTB travel switch XC is installed, thereby the trip switch XC connects with the coil of switch relay C and prevent that the bringing onto load that the pressure regulator contact does not take place from closing a floodgate when zero-bit, promptly have only when isolating the position of pressure regulator GTB in zero voltage value, switch element can be closed, this device can normally close a floodgate, otherwise switch relay C does not close.As shown in Figure 2, be the test that a 220KV ground network ground resistance is carried out, three connection terminal E (the 3rd test lead E), terminals P (the second test lead P), terminal C (the first test lead C) receive grounding body, current potential pile and electric current pile respectively among the figure.Wherein the E terminal connects the ground connection lead body, and the P terminal connects the current potential pile, and the C terminal connects the electric current pile.During measurement, produce an adjustable steady current at the C terminal, this electric current through lead D, electric current pile,, grounding body, E terminal, form current return.Wherein lead X is 0.618 times of lead D length, and the angle between lead X and the lead D is 30 °.During measurement, lead D is moved (1 point, 2 points, 3 points) three times, each displacement d is about 5% of a lead D length, and by measuring the voltage U between ground connection lead body and the P terminal, the ratio of its voltage and current I is exactly stake resistance Rg, that is: Rg=U/I.Grounding resistance is three grounding resistance measurement results' a mean value, i.e. Rg=1/3 (Rg1+Rg2+Rg3).
Claims (6)
1. adjustable earth mat resistance test device, it is characterized in that: comprise and isolate pressure regulator (GTB), the output winding two ends of this isolation pressure regulator (GTB) are connected with the 3rd test lead (E) with first test lead (C) respectively, a voltage table in parallel (V) between the 3rd test lead (E) and second test lead (P) wherein, by current transformer reometer (A) is installed between end of isolating pressure regulator (GTB) output winding and first test lead (C), the input winding two ends that isolate pressure regulator (GTB) are connected with power supply by switch control unit.
2. adjustable earth mat resistance test device as claimed in claim 1, it is characterized in that: wherein switch control unit is the relay latching circuit.
3. adjustable earth mat resistance test device as claimed in claim 2, it is characterized in that: its repeat circuit latching circuit comprises two couples of normally opened contact (C-1 that are connected on respectively in switch relay (C) main contacts of isolating between pressure regulator (GTB) input winding two ends and the power supply, C-2), a pair of normally opened contact (C-3) and one is often opened to connect with the coil of a normally closed button (TN) and switch relay (C) after button (HN) parallel connection again and is constituted on-off circuit in the auxiliary contact of this switch relay (C), and this on-off circuit is connected in parallel on both ends of power.
4. as any described adjustable earth mat resistance test device in the claim 1 to 3, it is characterized in that: wherein between end of isolation pressure regulator (GTB) the output winding that links to each other and the 3rd test lead (E), current relay (IJ) is installed by current transformer, a pair of normally closed contact (IJ-1) of this current relay (IJ) with switch relay (C) thus the coil deenergization when electric current is excessive of connecting.
5. as any described adjustable earth mat resistance test device in the claim 1 to 3, it is characterized in that: wherein also be parallel with a time relay (SJ) at both ends of power, a pair of normally closed contact (SJ-1) of this time relay (SJ) with switch relay (C) thus coil connect and crossing deenergization when keeping greatly electric current in long-time.
6. as any described adjustable earth mat resistance test device in the claim 1 to 3, it is characterized in that: wherein travel switch (XC) is installed at the coil initial position of isolating pressure regulator (GTB), the trip switch (XC) with switch relay (C) thus coil connect prevent the bringing onto load combined floodgate that the pressure regulator contact does not take place when zero-bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200623033U CN201583597U (en) | 2010-01-12 | 2010-01-12 | Adjustable ground screen resistance testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200623033U CN201583597U (en) | 2010-01-12 | 2010-01-12 | Adjustable ground screen resistance testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201583597U true CN201583597U (en) | 2010-09-15 |
Family
ID=42725602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200623033U Expired - Fee Related CN201583597U (en) | 2010-01-12 | 2010-01-12 | Adjustable ground screen resistance testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201583597U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879649A (en) * | 2012-10-12 | 2013-01-16 | 宁波市鄞州供电局 | Measurement method for grounding resistance |
| CN104698280A (en) * | 2015-02-06 | 2015-06-10 | 国电科学技术研究院银川电力技术分院 | Multi-functional test instrument for electrical equipment experiments |
-
2010
- 2010-01-12 CN CN2010200623033U patent/CN201583597U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879649A (en) * | 2012-10-12 | 2013-01-16 | 宁波市鄞州供电局 | Measurement method for grounding resistance |
| CN104698280A (en) * | 2015-02-06 | 2015-06-10 | 国电科学技术研究院银川电力技术分院 | Multi-functional test instrument for electrical equipment experiments |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20130112 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |