CN2527010Y - Safety isolation arc suppression and protection apparatus for power supply in mine - Google Patents
Safety isolation arc suppression and protection apparatus for power supply in mine Download PDFInfo
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- CN2527010Y CN2527010Y CN 02224430 CN02224430U CN2527010Y CN 2527010 Y CN2527010 Y CN 2527010Y CN 02224430 CN02224430 CN 02224430 CN 02224430 U CN02224430 U CN 02224430U CN 2527010 Y CN2527010 Y CN 2527010Y
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- power supply
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Abstract
The utility model relates to an insulating and arc eliminating and protecting device for mine power supply safety. The device is arranged in a power supply system which transmits electricity from the mine ground to the underground. The device comprises a lead-in switch with short-circuit protection function, a thermorelay with overcurrent protection and a three-phase zero-sequence reactor, the two ends of which are connected with a regulation capacitor parallelly; the output end of the zero-sequence reactor is connected with a three-phase descent line and an underground transmission line is provided with distributed capacitance. A secondary winding of the zero-sequence reactor is connected with a leakage-protection circuit. By adopting the device the utility model not only meets the requirements that the power supply transmission to the underground from no-slip point of the direct grounding transformer is prohibited in Mine Safety Rules, but also meets the demands, set by the electricity sector, that the no-slip point of the transformer is to be directly connected with the ground in ground power supply. The device can save investments and can effectively prevent the occurrence of physical electric shock underground and the hazards from gas and dust explosion underground caused by hard arc.
Description
One, technical field: the utility model relates to mine power supply safety and isolates extinguishing arc and protective device.
Two, background technology: existing Township Coal Mine of China and individual colliery adopt a transformer to be used for surface power supply mostly, simultaneously underground power supply used to the colliery again, this supply power mode is run counter to the requirement that " safety regulations in coal mine " regulation " is forbidden by the transformer of ground neutral-point solid ground or generator directly to underground power supply used ".Because of this supply power mode is taking place that the person gets an electric shock or during single phase ground fault, is being easy to generate hard arc and causes gas and dust explosion or accident of human electric shock.For addressing the above problem general three kinds of measures, the aboveground transformer of the first, mining transformer in down-hole of adopting in the prior art.Adopt this supply power mode to have following problem again: the power supply of 1. going into the well is the neutral-point solid ground mode, and is undesirable; 2. electric pressure does not match, and mining transformer is 6/0.4kV, and rural power grids are 10kV; 3. investment cost is big.The mining transformer cost has increased user's expense than power transformer price height.It two is to become ground level transformer to be neutral point direct grounding way not.Transformer neutral point is disconnected, become the transformer neutral point insulation mode or through high resistant (containing arc suppression coil) earthing mode, though this has satisfied the requirement of " safety regulations in coal mine ", but be subjected to the restriction of the following aspects again: 1. above-mentioned practice electric industry department does not allow, and the neutral point that explicitly calls for the low-voltage power supply transformer in China's " low pressure Electrical Safety rules " is ground connection directly; 2. because of transformer neutral point disconnects, when person electric shock or single-phase earthing took place, due to leakage current reduced, and causes former protective device sensitivity reduction even tripping, and the long-time running accident is difficult for finding further expansion accident scope; 3. the overvoltage phenomenon easily takes place, and causes the large tracts of land household electrical appliance to burn out; 4. transformer neutral point is intended having disconnected outwardly, but reality does not realize that transformer neutral point truly disconnects.Because of villager's electricity consumption must be adopted three-phase four-wire system, even disconnect its neutral point on transformer, the neutral point of disconnection is connected with the zero line of villager's electricity consumption, and the zero line formation that links to each other with the casing of villager's power consumption equipment is protected connecting to neutral.So just form the multiple spot iterative earthing, in fact transformer remains the neutral-point solid ground supply power mode.It three is that two transformer-supplied modes are adopted on ground simultaneously, and the neutral-point solid ground of a transformer is powered to the villager; The not direct ground connection of the neutral point of another transformer is to underground power supply used.The shortcoming of this supply power mode is that former transformer load reduces, and relative loss factor is big, unfavorable former transformer economic operation, and grid electricity fee cost increases relatively.Newly-increased transformer needs transformer purchase commodity, high-low voltage electric power distribution cabinet and construction cost etc., and is too big to the main increase one-time investment in ore deposit virtually, economical inadequately, the waste resource.The 4th kind of method is to adopt isolating transformer to realize going into the well the power supply isolated neutral, and this programme is subjected to the restriction of down-hole load, and when the down-hole load was big, isolating transformer loss increase should not be adopted, and through our retrieval, patent in this respect also arranged.
In view of all there is certain defective separately in above-mentioned four kinds of supply power modes, be unfavorable for the development of township enterprise, the utility model only adopts a transformer-supplied mode, both solve the direct grounding requirement of terrestrial user transformer neutral point, solved the not directly grounded requirement of neutral point of the down-hole electricity consumption of " safety regulations in coal mine two " regulation again.And have corresponding Electrical Safety extinguishing arc and a defencive function.
Three, summary of the invention: adopt a neutral-point solid ground transformer on the ground, the low-pressure side of transformer connects villager supply line, grass supply line respectively.Improvements of the present utility model are to go into the well and go into the well after circuit also is in series with mine power supply isolation extinguishing arc protective device again; signal sample circuit, short-circuit protection circuit, current foldback circuit are arranged in this device; the output of current foldback circuit is connected with zero-sequence reactor; the two ends of the zero-sequence reactor control capacittance that is connected in parallel; the output of zero-sequence reactor connects the underground power supply used circuit of three-phase, has line distribution capacitance to exist at the down-hole circuit.Described signal sampling circuit is connected with overvoltage crowbar, under-voltage, open-phase protection circuit respectively again, is connected with leakage protection circuit on the secondary coil of zero-sequence reactor.
The utility model compared with prior art, this device is only with a neutral-point solid ground transformer, it does not change the ground level transformer supply power mode, does not influence the electricity condition of using of ground power consumption equipment, can realize underground electric network isolated neutral supply power mode again.Meet the requirement of " safety regulations in coal mine ".The characteristics of its maximum are: 1. from the right of zero-sequence reactor, neutral by arc extinction coil grounding satisfies the not directly grounded requirement of neutral point of the supply transformer of going into the well; 2. from the left side of zero-sequence reactor, satisfy the requirement of surface power supply neutral-point solid ground; 3. the adjusting of arc suppression coil inductance value is to adopt shunt capacitance C
0Regulate, with The optimal compensation and the extinguishing arc that reaches capacitance current; 4. defencive functions such as overvoltage, under voltage, short circuit, overcurrent, phase shortage, ground connection and electric leakage have been realized.Particularly the zero-sequence current sampling is from the secondary coil of zero-sequence reactor, effectively preventing gas, coal dust explosion hazard that phase ground short circuit electric current causes and the harm that the down-hole person gets an electric shock or single phase ground fault caused, is ideal, the economic a kind of device of the little colliery of present domestic solution transformer neutral point problem with grounding.
The key technical indexes:
A. rated voltage U
n: three-phase 380V; 50Hz
B. rated current I
n: 45.6A; 75.9A; 121.5A; 151.9A; 243.1A
C. adapter transformer capacity S
n: 30KVA; 50KVA; 80KVA; 100KVA; 160KVA
D. neutral point isolation k
n: k
n〉=300
E. single-line to ground fault electric current: I
On≤ 150mA
F. single-phase lk ohmic leakage stream: I
R≤ 100mA
G. neutral point equiva lent impedance: z
0＞3k Ω
H. overvoltage operation voltage value U
Gk: 456+10V
I. under voltage operation voltage value U
Jk: 304-10V
J. overvoltage t operate time
Gk: t
Gk≤ 60s
K. under voltage t operate time
Jk: t
Jk≤ 120s
L. rated residual operating current I
Δ n: 50mA
M. specified electric leakage non-operating current I
Δ n0: 30mA
N. accessory power supply rated voltage U
Sn: direct current 12V; Exchange 15V.
O. specified leakage current protection t analysis time
Ar: t
Ar≤ 0.1s
P. specified overcurrent action setting value I
g: I
g=(1.2～2.0) I
n
Q. arc extinction compensation selection mode: 8 grades manually
R. humorous degree υ: υ 〉=0
Four, description of drawings
Fig. 1 is a circuit side connector block diagram of the present utility model;
Fig. 2 is the overvoltage of Fig. 1, under-voltage, open-phase protection system block diagram;
Fig. 3 is the overvoltage of Fig. 1, under-voltage, open-phase protection circuit figure;
Fig. 4 is the earth leakage protective schematic diagram of Fig. 1;
Fig. 5 is that neutral ground isolation and the extinguishing arc of Fig. 1 supplies the equivalent electric schematic diagram;
Five, specific implementation
Below in conjunction with accompanying drawing content of the present utility model is described further:
Shown in Figure 1: mine power supply safety is isolated extinguishing arc and protective device; the transformer 1 that comprises neutral-point solid ground; the low-pressure side of transformer 1 connects villager supply line 2, grass supply line 3 respectively; signal sampling circuit 7, short-circuit protection circuit 10 and current foldback circuit 11; the output of current foldback circuit 11 is connected with zero-sequence reactor 4, the two ends of the zero-sequence reactor 4 control capacittance C that is connected in parallel
0The output of zero-sequence reactor 4 is connected with the three-phase circuit 5 of going into the well; on the circuit 5 of going into the well line distribution capacitance 6 is arranged, described signal sampling circuit 7 is connected with overvoltage crowbar 8, under-voltage, open-phase protection circuit 9 respectively again, is connected with leakage protection circuit 12 on the secondary coil of zero-sequence reactor 4.
Shown in Figure 2, one end of three-phase voltage sampling filter circuit 13 links to each other with the input of the circuit breaker 1 with short-circuit protection function, the other end connects follower 14,15,16 respectively, the output of follower 14,15,16 connects overvoltage comparator 17,25,33 successively, with under-voltage or phase shortage comparator 21,29,37, each road signal processing is passed through delayer 18,26,34,22,30,38 successively; Comparator 19,27,35,23,31,39; Trigger 20,28,36,24,32,40.Circuit open-phase protection and under-voltage protection adopt same unit to realize among the figure, because the limiting condition of under-voltage protection is exactly system's phase-deficient operation.
Fig. 3 is the overvoltage of Fig. 2, under-voltage, open-phase protection circuit figure.Every phase protection philosophy is identical.Signal sample circuit 13 is by transformation instrument transformer TV
a, TV
b, TV
c, diode D
1～D
4, C
1, C
2, R
1, R
2Form.Resistance R
3Output and follower A
114 connect, and a road of follower 14 is taken over voltage protection circuit, by R
5, R
6, R
7, A
2 Form overvoltage comparator 17, by R
8, C
3Form delayer 18, by R
9, R
10, R
11, A
3Form and judge comparator 19, by J
1, D
5, SCR1 forms overvoltage trigger 20; Another route R of follower 14
12, R
13, R
14, A
4Form under-voltage phase shortage comparator 21, by R
15, C
4Form delayer 22, by R
16, R
17, R
18, A
5Form under-voltage, phase shortage judgement comparator 23, by J
2, D
6, SCR2 forms under-voltage, phase shortage trigger 24.
Other two facies principles are same as described above.
Fig. 4 is the earth leakage protective schematic diagram, the secondary coil M of the input of zero-sequence current sample circuit and zero-sequence reactor 4
0Connect, the other end connect successively by D
19～D
22, C
17, C
18, R
57, R
58Form electric leakage sampling filter circuit, A
17, R
59, R
60Form follower, by R
61, R
62, R
63, A
18Form the electric leakage comparison circuit, by R
64, C
17Form the electric leakage delayer, by R
65, R
66, R
67, A
19Form the circuit of adjusting that leaks electricity, by J
7, D
23, SCR7 forms the electric leakage trigger.
Fig. 5 (a) is neutral ground isolation and extinguishing arc power supply the principle figure, is M among the figure
1, M
2, M
3Mutual inductance coupling coefficient, C are line distribution capacitance, R
rBe the personal electric shock resistance of equivalence, L
0Be reactor inductance, R
0Be substitutional resistance.At transformer 1 tandem reactor L on underground power supply used circuit
0With control capacittance C in parallel
0Form zero-sequence reactor 4.The output of zero-sequence reactor 4 is again to underground power supply used, its equivalent circuit shown in Fig. 5 (b), its neutral point reactance X
L0Play the neutral point buffer action, under the failure condition in inductance L
0' on produce inductance current and play the compensating arc distinction effect.
In sum; " safety regulations in coal mine two " is the industry laws that coal production enterprise should observe; its rules regulation " to the direct ground connection of underground power supply used transformer neutral point ", and " the down-hole low-voltage power supply should have short circuit, overload, under-voltage release, earth leakage search/lockout protective device ".The technical solution of the utility model designs by the pertinent regulations of rules, the innovation and creation that reduce production costs and done for manufacturing enterprise again simultaneously.Make the following instructions with regard to defencive function of the present utility model below:
1. overvoltage protection
Overvoltage protection is for preventing that line voltage from raising or too small too high power consumption equipment or the circuit of causing of supply power voltage that cause of loading
Insulation breakdown, discharge, accident such as overheated take place and the defencive function that is provided with.The overvoltage protection signals collecting is from power inleting terminal, and each is handled respectively mutually.Its overvoltage operating value is 380v+20% (456v+10v), and overvoltage 60s deferred action is tripped in the circuit breaker tripping coil, and shows with indicator light.
2. under-voltage and open-phase protection
Mains supply voltage reduces or power load will cause under voltage when excessive, and underground equipment is based on motor, and long-term under-voltage operation causes circuit and device current to increase, and causes supply line and motor overheating or burns out.
Phase-deficient operation can cause over current of motor, can burn out motor and supply line when serious, and equipment end operation and safety of coal mines are worked the mischief.
Under-voltage and phase shortage detects and adopts phase-splitting to handle, and which is mutually under-voltage or phase shortage all will be through relatively delaying time, trigger ring
Joint acts on tripping operation and provides light signal.
3. overcurrent protection
Overcurrent protection utilizes thermal relay/realization defencive function, has the anti-time limit characteristic of overcurrent protection.The overcurrent setting value
(1.2～2.0) In, and move in circuit breaker tripping coil and light indication.
4. earth leakage protective
Utilize the output of zero-sequence reactor secondary coil as the zero-sequence current output signal.When system normally moved, output signal was zero;
During the system earth short circuit, output signal is as zero sequence current signal.And fault is more serious, and output signal is bigger.This signal acts on and triggers the tripping operation exclusive circuit through second-order filter, rectification, amplification, comparison, and by light signal indication fault type.
Claims (4)
1. a mine power supply safety is isolated extinguishing arc and protective device; comprise neutral-point solid ground transformer (1); the low-pressure side of transformer (1) connects villager supply line (2), grass supply line (3) respectively; it is characterized in that low-pressure side also is connected with signal sample circuit 7, short-circuit protection circuit 10 and current foldback circuit (11) respectively; the output of current foldback circuit (11) is connected with zero-sequence reactor (4), the two ends of zero-sequence reactor (4) control capacittance (C that is connected in parallel
0); the output of zero-sequence reactor (4) connects the three-phase circuit (5) of going into the well; in the left side of the circuit of going into the well (5) is line distribution capacitance (6); described signal sample circuit (7) is in order to the sampling mains voltage signal; be connected with overvoltage crowbar (8), under-voltage, open-phase protection circuit (9) respectively, on the secondary coil of zero-sequence reactor (4), be connected with leakage protection circuit (12).
2. according to claim 1; mine power supply safety is isolated extinguishing arc and protective device; it is characterized in that underground power supply used is to reach to the not directly grounded isolation purpose of underground power supply used power supply neutral point by zero-sequence reactor; and the ground power consumption equipment still keeps three-phase four-wire system, and the direct ground connection of transformer neutral point.
3. mine power supply safety according to claim 1 and 2 is isolated extinguishing arc and protective device, it is characterized in that adopting adjusting zero-sequence reactor capacitor C that two ends connect
0Value changes to underground power supply used power supply neutral point arc suppression coil inductance value size extinguishing arc.
4. isolate extinguishing arc and protective device according to the described mine power supply safety of claim 1, it is characterized in that adopting detecting sensor, electronic type overvoltage, under-voltage, phase shortage, earth leakage protective device, circuit breaker, thermal relay to form to have and report to the police and motion combination formula earth leakage protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224430 CN2527010Y (en) | 2002-01-16 | 2002-01-16 | Safety isolation arc suppression and protection apparatus for power supply in mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02224430 CN2527010Y (en) | 2002-01-16 | 2002-01-16 | Safety isolation arc suppression and protection apparatus for power supply in mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2527010Y true CN2527010Y (en) | 2002-12-18 |
Family
ID=33701847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02224430 Expired - Fee Related CN2527010Y (en) | 2002-01-16 | 2002-01-16 | Safety isolation arc suppression and protection apparatus for power supply in mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2527010Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100412556C (en) * | 2005-01-31 | 2008-08-20 | 傅桂兴 | Low-voltage electric network sequential discriminating leakage selecting method and protector for mine |
| CN100495846C (en) * | 2004-10-12 | 2009-06-03 | 苏建国 | Arc protection and fireproof circuit for power supply cable |
| CN1558091B (en) * | 2004-01-19 | 2010-04-21 | 河北工业大学 | Downhole used electrization and leak observation circuit |
| CN102005727A (en) * | 2010-11-12 | 2011-04-06 | 煤炭科学研究总院重庆研究院 | Single motor protection device for dragging double motor through single frequency conversion |
| CN110045213A (en) * | 2019-05-23 | 2019-07-23 | 天地（常州）自动化股份有限公司 | 6kV, 10kV high-- voltage leakage protective pilot system and test method |
-
2002
- 2002-01-16 CN CN 02224430 patent/CN2527010Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558091B (en) * | 2004-01-19 | 2010-04-21 | 河北工业大学 | Downhole used electrization and leak observation circuit |
| CN100495846C (en) * | 2004-10-12 | 2009-06-03 | 苏建国 | Arc protection and fireproof circuit for power supply cable |
| CN100412556C (en) * | 2005-01-31 | 2008-08-20 | 傅桂兴 | Low-voltage electric network sequential discriminating leakage selecting method and protector for mine |
| CN102005727A (en) * | 2010-11-12 | 2011-04-06 | 煤炭科学研究总院重庆研究院 | Single motor protection device for dragging double motor through single frequency conversion |
| CN110045213A (en) * | 2019-05-23 | 2019-07-23 | 天地（常州）自动化股份有限公司 | 6kV, 10kV high-- voltage leakage protective pilot system and test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |