CN203849359U - Converter station-to-outside feed line single-phase earth fault detection control apparatus - Google Patents
Converter station-to-outside feed line single-phase earth fault detection control apparatus Download PDFInfo
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- CN203849359U CN203849359U CN201420106986.6U CN201420106986U CN203849359U CN 203849359 U CN203849359 U CN 203849359U CN 201420106986 U CN201420106986 U CN 201420106986U CN 203849359 U CN203849359 U CN 203849359U
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- 206010034703 Perseveration Diseases 0.000 description 4
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- 230000005540 biological transmission Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 206010001541 Akinesia Diseases 0.000 description 1
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Abstract
The utility model discloses a converter station-to-outside feed line single-phase earth fault detection control apparatus comprising a station power utilization control system and a low-voltage detection system. The low-voltage detection system comprises a reference voltage source, a first comparator, a second comparator, a third comparator, a first AND gate, a first OR gate, a second OR gate and a second AND gate. According to the converter station-to-outside feed line single-phase earth fault detection control apparatus, the low-voltage detection system is additionally arranged in the station power utilization control system, the low-voltage detection system solves a problem that no protection motion exists to tackle a fault when the outside feed line single-phase earth fault occurs, and severe consequences that may be caused due to voltage loss of a 10kV bus in a station when the outside feed line single-phase earth fault causes repeated motions of spare power automatic switching are prevented.
Description
Technical field
The utility model relates to power technology field, is specifically related to a kind of 10kV station power use system and is subject to Feeder to station to affect the detection control apparatus that causes prepared auto restart perseveration and finally cause corresponding 10kV bus loss of pressure.
Background technology
Along with the application of high voltage dc transmission technology is more and more extensive, the high voltage DC power transmission converter station of nationwide operation is more and more, DC transmission engineering proportion in electric system is also increasing, and its operational reliability has vital effect to the security and stability of electric system.The auxiliary equipment such as valve cooling system are key factors that affects current conversion station operational reliability, thus, the operational reliability of station power use system are had higher requirement.
Some current conversion stations are subject to the restriction of geographical conditions, and the interior water of standing need to be evacuated to pond in station by multi-stage water pump room from water source far away and store, and this just needs to draw feeder line in slave station and supplies with pump house.Length to the outer pump house feeder line in station is longer, and service condition is also very severe, and the probability breaking down is larger.At present; in the station power consumption control system of some current conversion stations, prepared auto restart logic is directly to use phase voltage as criterion; and 10kV station power use system isolated neutral system often; when to station outside feeder line generation singlephase earth fault time; the circuit overcurrent protection of configuration can not moved excision fault; this will cause that in joined station, 10kV busbar voltage reduces, and causes prepared auto restart action perseveration, and the bus loss of pressure phenomenon that finally causes 10kV bus service entrance switch, block switch simultaneously to disconnect.This operation to important loads such as current conversion station valve cooling systems has caused great threat, may cause direct current stoppage in transit when serious, and consequence is serious.
Utility model content
For above deficiency, the utility model provides a kind of current conversion station to the outer Feeder detection control apparatus in station.
For realizing above object, the technical scheme that the utility model is taked is:
A kind of current conversion station is to the outer Feeder detection control apparatus in station, and it comprises the power consumption control system of standing, for gathering and export the effective value of A phase busbar voltage of bus, the effective value of the effective value of B phase busbar voltage and C phase busbar voltage, this current conversion station further comprises a low voltage detection system to the outer Feeder detection control apparatus in station, described low voltage detection system comprises reference voltage source, the first comparer, the second comparer, the 3rd comparer, first with door, first or door, second or door, second with door, wherein, the first comparer, the negative input end of the second comparer and the 3rd comparer is all connected to the output terminal of reference voltage source, its positive input terminal respectively with the effective value of A phase busbar voltage, the effective value of the effective value of B phase busbar voltage and C phase busbar voltage is connected, described the first comparer, the output terminal of the second comparer and the 3rd comparer be connected to respectively first or door three input ends, described the first comparer, the output terminal of the second comparer and the 3rd comparer also passes through respectively the first not gate, the second not gate and the 3rd not gate be connected to second or door three input ends, described first with door two input ends be connected to station outer feeder switch closing position and station outer feeder switch working position, described first and, first or door, second or door output terminal be connected to respectively second with door input end, described second with door output terminal be connected in station outer feeder switch.
Described low voltage detection system further comprises a reduction voltage circuit, described reduction voltage circuit comprises the first reduction voltage circuit, the second reduction voltage circuit, the 3rd reduction voltage circuit, the 4th reduction voltage circuit, wherein, described the first reduction voltage circuit is connected in the output terminal of reference voltage source, the second reduction voltage circuit is connected between station power consumption control system and the first comparer, the 3rd reduction voltage circuit is connected between station power consumption control system and the second comparer, and the 4th reduction voltage circuit is connected between station power consumption control system and the 3rd comparer.
The output end voltage of described the first reduction voltage circuit is 1/1000 of its input terminal voltage, and the output end voltage of described the second reduction voltage circuit, the 3rd reduction voltage circuit, the 4th reduction voltage circuit is its respective input voltage
Described low voltage detection system further comprises a delay circuit, described delay circuit comprise auxiliary voltage source, electronic switch, timing relay and described timing relay corresponding often open auxiliary contact, the power input of described timing relay is connected with auxiliary voltage source, its output head grounding, described often open auxiliary contact be connected in second or door with second and between, one end of described electronic switch be connected in second or Men Yuchang open between auxiliary contact, the other end is connected to the control end of timing relay.
The voltage of described reference voltage source judges that with prepared auto restart the definite value of voltage is identical.Described prepared auto restart judges that the definite value of voltage is 8.5kV.
The utility model compared with prior art; its beneficial effect is: the utility model has increased low voltage detection system in the power consumption control system of station; when this system has solved to the outer Feeder in station, unprotect is moved the problem of failure removal, has avoided also finally causing to the prepared auto restart perseveration that the outer Feeder in station causes the serious consequence that in station, 10kV bus loss of pressure may cause.
Brief description of the drawings
Fig. 1 is the schematic block circuit diagram of a kind of current conversion station of the utility model to the outer Feeder detection control apparatus in station.
Wherein: 1, the power consumption control system of standing; 2, reference voltage source; 31, reduction voltage circuit; 32, reduction voltage circuit; 33, reduction voltage circuit; 34, reduction voltage circuit; 41, not gate; 42, not gate; 43, not gate; 51, with door; 52 or door; 53 or door; 61, the outer feeder switch closing position of standing; 62, the outer feeder switch working position of standing; 7, with door; 8, the outer feeder switch of standing; 91, auxiliary voltage source; 92, timing relay; 93, often open auxiliary contact; 94, electronic switch; 10, bus; U1, comparer; U2, comparer; U3, comparer.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present utility model is described in further details.
Embodiment
The present embodiment is the example that south electric network Converter Station power consumption control system is specifically utilized low-voltage measuring ability, this current conversion station water relies on outer triplex room, station to extract from waterworks, and the circuit that 10kV#101M, the #102M in standing is given to by the outer feeder switch in 1106DL, 1206DL station the outer pump house of standing respectively provides power supply.Extremely the outer circuit in station is the common-tower double-return bare metal wire that cement pole sets up, and double back line length is 18.6km, and environmental baseline along the line is severe, and line fault probability is high.When after circuit generation singlephase earth fault, the route protection akinesia excision fault of configuration, fault will cause that in station, 10kV prepared auto restart perseveration also finally causes feeder line place 10kV bus loss of pressure.
Please refer to shown in Fig. 1, a kind of current conversion station is to the outer Feeder detection control apparatus in station, and it comprises the power consumption control system 1 of standing, for gathering and export the effective value of A phase busbar voltage of bus 10, the effective value of the effective value of B phase busbar voltage and C phase busbar voltage, this current conversion station further comprises a low voltage detection system to the outer Feeder detection control apparatus in station, low voltage detection system comprises reference voltage source 2, comparer U1, comparer U2, comparer U3, with door 51, or door 52, or door 53, with door 7, wherein, comparer U1, the negative input end of comparer U2 and comparer U3 is all connected to the output terminal of reference voltage source 2, its positive input terminal respectively with the effective value of A phase busbar voltage, the effective value of the effective value of B phase busbar voltage and C phase busbar voltage is connected, comparer U1, the output terminal of comparer U2 and comparer U3 is connected to respectively or door three input ends of 52, comparer U1, the output terminal of comparer U2 and comparer U3 also passes through respectively not gate 41, not gate 42 and not gate 43 are connected to or door three input ends of 53, are connected to the outer feeder switch closing position 61 in station and the outer feeder switch working position 62 of standing, with door 51 with two input ends of door 51, or door 52, or door 53 output terminal is connected to respectively and the input end of door 7, be connected in the outer feeder switch 8 in station with the output terminal of door 7.In the utility model preferred embodiment, the voltage of reference voltage source 2 can judge that the definite value (8.5kV) of voltage is identical with prepared auto restart.Stand outer feeder switch 8 taking 1106DL as example, therefore, the outer feeder switch closing position 61 of standing is respectively 1106DL switch closing position and 1106DL switch position with outer feeder switch working position 62, station, and the power consumption control system 1 of standing also can adopt three voltage transformer (VT) to substitute.
In order to adapt to the voltage needs of comparer, be provided with reduction voltage circuit in low voltage detection system, reduction voltage circuit comprises reduction voltage circuit 31, reduction voltage circuit 32, reduction voltage circuit 33, reduction voltage circuit 34, wherein, reduction voltage circuit 31 is connected in the output terminal of reference voltage source 2, reduction voltage circuit 32 is connected between station power consumption control system 1 and comparer U1, and reduction voltage circuit 33 is connected between station power consumption control system 1 and comparer U2, and reduction voltage circuit 34 is connected between station power consumption control system 1 and comparer U3.The form that reduction voltage circuit 31-34 can adopt resistance to build realizes following functions: the output end voltage of reduction voltage circuit 31 is its input terminal voltage 1/1000, and the output end voltage of reduction voltage circuit 32, reduction voltage circuit 33, reduction voltage circuit 34 is its respective input voltage
Low voltage detection system further comprises a delay circuit, delay circuit comprises auxiliary voltage source 91, electronic switch 94, timing relay 92 and timing relay 92 correspondences often open auxiliary contact 93, the power input of timing relay 92 is connected with auxiliary voltage source 91, its output head grounding, often open that auxiliary contact 93 is connected in or door 53 and and door 7 between, one end of electronic switch 94 is connected in or door 53 and often open between auxiliary contact 93, the other end is connected to the control end of timing relay 92, electronic switch 94 can be selected triode and metal-oxide-semiconductor etc., in the time being output as 1 with door 53, electronic switch 94 is worked timing relay 92, after timing relay 92 delay time T, it often opens auxiliary contact 93 closures.
Principle of work of the present utility model is:
The effective value of the 10kV bus three-phase voltage that 1, utilization station power consumption control system 1 gathers;
2, by comparer by the effective value of three-phase voltage
doubly compare respectively with the voltage of reference voltage source 2, the voltage of reference voltage source 2 is desirable judges that with prepared auto restart the definite value of voltage is consistent;
3, when the effective value of three-phase voltage
when doubly one of them is less than the voltage of reference voltage source 2, or door 53 be output as 1, judge bus and connect feeder line and have singlephase earth fault;
4, when the effective value of three-phase voltage
when doubly wherein at least one is greater than the voltage of reference voltage source 2, or door 52 be output as 1, low voltage detection system is blocked;
5, be referenced to the outer feeder switch closing position 61 in station and outer feeder switch working position, station 62 signals, in the time being output as 1 with door 51, simultaneously and while meeting step 3 and step 4, the time delay of elapsed time T, the action of low-voltage measuring ability, the selection principle of time T: the delay circuit of low voltage detection system by choose suitable time definite value (in embodiment for 1000ms) can move prior to prepared auto restart (in embodiment, prepared auto restart judge that the time of voltage decompression is 1800ms) eliminate the impact of feeder fault on station power use system operational reliability outside standing, the route protection configuring in the time of circuit phase fault first moves (in embodiment, circuit operating time of protection is 800ms),
6, low-voltage measuring ability action consequence: be disconnected to the outer feeder switch in station;
By above step, can be by low-voltage measuring ability action excision fault in the time of Feeder to station.In step 4, the locking of low-voltage measuring ability can be avoided 10kV bus loss of pressure in the process of normally switching station electricity consumption to cause feeder switch to station to disconnect.
Above-listed detailed description is for the illustrating of the utility model possible embodiments, and this embodiment is not in order to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.
Claims (6)
1. a current conversion station is to the outer Feeder detection control apparatus in station, it comprises station power consumption control system (1), be used for the effective value of the A phase busbar voltage that gathers and export bus (10), the effective value of the effective value of B phase busbar voltage and C phase busbar voltage, it is characterized in that, this current conversion station to the outer Feeder detection control apparatus in station further comprises a low voltage detection system, described low voltage detection system comprises reference voltage source (2), the first comparer (U1), the second comparer (U2), the 3rd comparer (U3), first with door (51), first or door (52), second or door (53), second with door (7), wherein, the first comparer (U1), the negative input end of the second comparer (U2) and the 3rd comparer (U3) is all connected to the output terminal of reference voltage source (2), its positive input terminal respectively with the effective value of A phase busbar voltage, the effective value of the effective value of B phase busbar voltage and C phase busbar voltage is connected, described the first comparer (U1), the output terminal of the second comparer (U2) and the 3rd comparer (U3) be connected to respectively first or door (52) three input ends, described the first comparer (U1), the output terminal of the second comparer (U2) and the 3rd comparer (U3) also passes through respectively the first not gate (41), the second not gate (42) and the 3rd not gate (43) be connected to second or door (53) three input ends, described first is connected to the outer feeder switch closing position in station (61) and outer feeder switch working position, station (62) with two input ends of door (51), described first with door (51), first or door (52), second or door (53) output terminal be connected to respectively second with door (7) input end, described second is connected in the outer feeder switch in station (8) with the output terminal of door (7).
2. current conversion station according to claim 1 is to the outer Feeder detection control apparatus in station, it is characterized in that, described low voltage detection system further comprises a reduction voltage circuit, described reduction voltage circuit comprises the first reduction voltage circuit (31), the second reduction voltage circuit (32), the 3rd reduction voltage circuit (33), the 4th reduction voltage circuit (34), wherein, described the first reduction voltage circuit (31) is connected in the output terminal of reference voltage source (2), the second reduction voltage circuit (32) is connected between station power consumption control system (1) and the first comparer (U1), the 3rd reduction voltage circuit (33) is connected between station power consumption control system (1) and the second comparer (U2), the 4th reduction voltage circuit (34) is connected between station power consumption control system (1) and the 3rd comparer (U3).
3. current conversion station according to claim 2 is to the outer Feeder detection control apparatus in station, it is characterized in that, the output end voltage of described the first reduction voltage circuit (31) is its input terminal voltage 1/1000, and the output end voltage of described the second reduction voltage circuit (32), the 3rd reduction voltage circuit (33), the 4th reduction voltage circuit (34) is its respective input voltage
4. current conversion station according to claim 1 is to the outer Feeder detection control apparatus in station, it is characterized in that, described low voltage detection system further comprises a delay circuit, described delay circuit comprises auxiliary voltage source (91), electronic switch (94), what timing relay (92) and described timing relay (92) were corresponding often opens auxiliary contact (93), the power input of described timing relay (92) is connected with auxiliary voltage source (91), its output head grounding, described often open auxiliary contact (93) be connected in second or door (53) with second and (7) between, one end of described electronic switch (94) is connected in second or door (53) and often open between auxiliary contact (93), the other end is connected to the control end of timing relay (92).
5. according to the extremely outer Feeder detection control apparatus in station of the current conversion station described in claim 1-4 any one, it is characterized in that, the voltage of described reference voltage source (2) judges that with prepared auto restart the definite value of voltage is identical.
6. current conversion station according to claim 5, to the outer Feeder detection control apparatus in station, is characterized in that, described prepared auto restart judges that the definite value of voltage is 8.5kV.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420106986.6U CN203849359U (en) | 2014-03-11 | 2014-03-11 | Converter station-to-outside feed line single-phase earth fault detection control apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420106986.6U CN203849359U (en) | 2014-03-11 | 2014-03-11 | Converter station-to-outside feed line single-phase earth fault detection control apparatus |
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| CN203849359U true CN203849359U (en) | 2014-09-24 |
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| CN201420106986.6U Expired - Lifetime CN203849359U (en) | 2014-03-11 | 2014-03-11 | Converter station-to-outside feed line single-phase earth fault detection control apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782125A (en) * | 2018-12-25 | 2019-05-21 | 中国南方电网有限责任公司超高压输电公司曲靖局 | A kind of earth-free Single-phase Earth Fault of Power System identification and partition method |
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2014
- 2014-03-11 CN CN201420106986.6U patent/CN203849359U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782125A (en) * | 2018-12-25 | 2019-05-21 | 中国南方电网有限责任公司超高压输电公司曲靖局 | A kind of earth-free Single-phase Earth Fault of Power System identification and partition method |
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Granted publication date: 20140924 |