CN207336683U - Transmission lines earth fault investigates warning device - Google Patents
Transmission lines earth fault investigates warning device Download PDFInfo
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- CN207336683U CN207336683U CN201720661743.2U CN201720661743U CN207336683U CN 207336683 U CN207336683 U CN 207336683U CN 201720661743 U CN201720661743 U CN 201720661743U CN 207336683 U CN207336683 U CN 207336683U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 40
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- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 14
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
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- 230000036632 reaction speed Effects 0.000 description 2
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Abstract
Transmission lines earth fault investigation warning device is the utility model is related to, belongs to power transmission failure detection technique field.The device includes vacuum circuit breaker, transformer, ground detection device, shunt circuitbreaker, zero sequence current mutual inductor, detection of electrical leakage alarm；Vacuum circuit breaker one end is connected with three-phase bus respectively, and A, B, C high-voltage winding connection of the other end and transformer, A, B, C low pressure winding of transformer are connected by rheostat with grounding net of transformer substation, and high voltage side of transformer neutral point is connected with grounding net of transformer substation；Shunt circuitbreaker and zero sequence current mutual inductor, the output terminal connection detection of electrical leakage alarm of zero sequence current mutual inductor are set gradually in the branch that three-phase bus separates；Three-phase bus is also connected by ground detection device with grounding net of transformer substation, and the signal output part of ground detection device is connected with vacuum circuit breaker.The utility model automatic decision failure branch when earth fault occurs, is swift in response, easy to operate.
Description
Technical field
Transmission lines earth fault investigation warning device is the utility model is related to, belongs to power transmission failure detection technique field.
Background technology
Substation is voltage of transformation in electric system, receiving and distribution electric energy, the flow direction for controlling electric power and adjustment voltage
Electric power facility, it is got up the grid contact of each step voltage by its transformer.The normal operation of substation is given birth to for industrial or agricultural
Production is important guarantee.But in day-to-day operation, the transmission line of electricity of substation inevitably breaks down, especially
Earth fault.Current substation 10KV earthing alarm unit working procedures are such：When earth fault occurs for 10KV circuits
When, it is necessary to which it to determine is that there occurs earth fault for that circuit on earth that operator on duty or dispatcher, which try to draw one by one each branch,.This
The shortcomings that kind of system is：1st, speed is slow, cumbersome.2nd, for some to the more demanding responsible consumer of power quality（Such as：It is large-scale
Enterprise, integrated mill etc.）If this mode is drawn using examination, it will huge economic loss is brought to these enterprises, and is led
Family the rate of complaints of applying is higher.
Utility model content
The purpose of this utility model is to provide a kind of investigation that can in time detect and find simultaneously accurate judgement earth fault line
Warning device.
To achieve these goals, the technical solution adopted in the utility model is：
A kind of transmission lines earth fault investigates warning device, in the transmission line of electricity of three-phase four-wire system, the alarm
Device includes vacuum circuit breaker, transformer, ground detection device, shunt circuitbreaker, zero sequence current mutual inductor, detection of electrical leakage alarm
Device；Vacuum circuit breaker one end is connected with A, B, C three-phase bus respectively, and A, B, C high-voltage winding connection of the other end and transformer, become
A, B, C low pressure winding of depressor are connected by rheostat with grounding net of transformer substation, and high voltage side of transformer neutral point connects with substation
Earth mat connects；A, shunt circuitbreaker and zero sequence current mutual inductor, zero-sequence current are set gradually in the branch that B, C three-phase bus separate
The output terminal connection detection of electrical leakage alarm of mutual inductor；A, B, C three-phase bus also pass through ground detection device and substation grounding
Net connection, the signal output part of ground detection device are connected with vacuum circuit breaker.
Further, vacuum circuit breaker is permanent magnet type vacuum circuit-breaker.
Further, the rheostat is slide rheostat.
Further, the Standard resistance range of slide rheostat is 0~100 Ω, and the power of slide rheostat is 30kW.
Further, detection of electrical leakage alarm include amplifying circuit and the indicator light that is connected with amplification circuit output end and
Loudspeaker.
Further, the transformer directly becomes for 35KV30KW.
Further, the investigation warning device is used for 10KV transmission lines of electricity；Ground detection device is 10KV earthing detections
Device, shunt circuitbreaker are 10KV shunt circuitbreakers.
By adopting the above-described technical solution, the beneficial technique effect that the utility model obtains has：
The utility model in the case where not breaking each branch, can quick and precisely judge the branch of generation earth fault,
Avoid situation about causing damages because breaking the branch of normal work to relevant enterprise.
The utility model can when earth fault occurs automatic decision failure branch, reaction speed is fast, easy to operate.
The utility model is amplified using zero-sequence current caused by earth fault occurs by detection of electrical leakage alarm
And driving indicator light and loudspeaker produce sound-light alarm later for processing, without extra operation, can effectively improve security.
Brief description of the drawings
Fig. 1 is utility model diagram；
Wherein, 1, three-phase bus, 2, No. 1 branches, 3, No. 2 branches, 4, vacuum circuit breaker, 5, ground detection device, 6, become
Depressor, 7, shunt circuitbreaker, 8, zero sequence current mutual inductor, 9, detection of electrical leakage alarm, 10, rheostat, 11, substation grounding
Net.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further details the utility model：
The utility model discloses a kind of transmission lines earth fault to investigate warning device, the transmission of electricity for three-phase four-wire system
In circuit.The utility model is mainly used in the transmission line of electricity of 10KV substations, but is not limited only to the power transmission line of 10KV substations
Road.
It is mutual that the warning device includes vacuum circuit breaker, transformer, ground detection device, shunt circuitbreaker, zero-sequence current
Sensor, detection of electrical leakage alarm.Vacuum circuit breaker one end is connected with A, B, C triple line respectively, A, B, C of the other end and transformer
High-voltage winding connects, and A, B, C low pressure winding of transformer are connected by resistance with grounding net of transformer substation, and high voltage side of transformer is neutral
Point is connected with grounding net of transformer substation；A, shunt circuitbreaker and zero sequence current mutual inductance are set gradually in the branch that B, C triple line separate
Device, the output terminal connection detection of electrical leakage alarm of zero sequence current mutual inductor；A, B, C triple line also pass through ground detection device and change
Power station grounded screen connection, the signal output part of ground detection device are connected with vacuum circuit breaker.Ground detection device and substation
Grounded screen is the existing equipment of substation.
Detection of electrical leakage alarm includes amplifying circuit and the instruction being connected with amplification circuit output end in the utility model
Lamp and loudspeaker, wherein amplifying circuit are used to the induced electricity stream that zero sequence current mutual inductor produces being amplified to drive indicator light
Work operation is carried out with loudspeaker, prompts staff that the specific branch of earth fault occurs.
Vacuum circuit breaker is permanent magnet type vacuum circuit-breaker in the utility model, and permanent magnet type vacuum circuit-breaker good reliability, make
With long lifespan, it is swift in response, can ensures whole warning device long-time steady operation.
3 rheostats preferentially select slide rheostat in the utility model, can be adjusted using slide rheostat and directly become higher
Press side reactance value, so as to have adjusted 10KV earth current values, make the present apparatus can reliable in action to be unlikely to earth current again excessive,
If being possible to cause 10KV devices overcurrent protective device to trip when electric current is excessive, what which ensure that warning device work can
By property.The Standard resistance range of slide rheostat in the utility model is preferentially arranged to 0~100 Ω, and the power of slide rheostat is excellent
First it is arranged to 30kW.
Investigation warning device in the utility model is mainly used for 10KV transmission lines of electricity；Ground detection device is grounded for 10KV
Detection device, shunt circuitbreaker are 10KV shunt circuitbreakers.Transformer in the utility model is generally 35KV30KW and directly becomes.
In the warning device schematic diagram of Fig. 1, two branches i.e. No. 1 branch 2 and No. 2 branches 3 are only illustrated that
Situation, branch can have several in actual transmission line of electricity, and what the arrow in Fig. 1 represented is the trend of leakage current.
Below by taking No. 1 branch as an example, the operation principle of the utility model is illustrated：Assuming that No. 1 branch 2 of 10KV
C phase factor fault grounds, then 10KV ground detection devices detect first ground signalling then to permanent magnetic vacuum breaker output one
Control signal makes it close 2 seconds（Voluntarily disconnected after 2 seconds）, during its closure, the C of No. 1 branch relatively leakage current ILBy C
Phase inflow the earth flows into 35KV30KW by grounding net of transformer substation 11 again by the earth inflow grounding net of transformer substation 11 again and directly becomes high-pressure side
Neutral point returns to A, B two-phase through A, B high-voltage winding respectively again, and the electric current as can be seen from the figure flowed out by No. 1 branch C phase is not
There are the C phases through No. 1 branch to flow back to, thus just generate residual current namely zero-sequence current, so that will be mutual in zero-sequence current
Induced voltage is produced in the secondary windings of sensor, which, which is sent to drive after detection of electrical leakage alarm is amplified and handles, refers to
Show that lamp and loudspeaker produce sound-light alarm.
The utility model is on the basis of existing grounding net of transformer substation and ground detection device by setting zero sequence electric
Current transformer is detected the leakage current that three-phase bus is returned by transformer, simple in structure easy to use.
When transmission line of electricity leaks electricity, ground detection device detects ground signalling and then to forever the utility model first
Magnetic vacuum breaker, which exports a control signal, makes it close 2 seconds（Voluntarily disconnected after 2 seconds）, can be rapid during its closure
Detect the branch of transmission line of electricity to break down.It can also prevent leakage current from persistently flowing back to three-phase bus simultaneously may be right at the same time
Other normal branches produce harmful effect.
The utility model in the case where not breaking each branch, can quick and precisely judge the branch of generation earth fault,
Situation about causing damages because breaking the branch of normal work to relevant enterprise is avoided, ensure that the normal production of enterprise, together
When reduce the complained rate of power supply enterprise.The utility model not only has the function of that alarm also has investigation failure judgement branch
Function, reduce time of the failure from occurring to being excluded, reduce the loss of relevant enterprise as far as possible.
The utility model can automatic decision breaks down when earth fault occurs branch, reaction speed is fast, operation
Simply.
The utility model is amplified using zero-sequence current caused by earth fault occurs by detection of electrical leakage alarm
And driving indicator light and loudspeaker produce sound-light alarm later for processing, without extra operation, can effectively improve security.
Claims (7)
1. a kind of transmission lines earth fault investigates warning device, it is characterised in that：For in the transmission line of electricity of three-phase four-wire system,
The warning device includes vacuum circuit breaker（4）, transformer（6）, ground detection device（5）, shunt circuitbreaker（7）, zero sequence electricity
Current transformer（8）, detection of electrical leakage alarm（9）；Vacuum circuit breaker（4）One end and A, B, C three-phase bus respectively（1）Connection, separately
One end and transformer（6）A, B, C high-voltage winding connection, transformer（6）A, B, C low pressure winding pass through rheostat（10）With change
Power station grounded screen（11）Connection, transformer（6）High-pressure side neutral point and grounding net of transformer substation（11）Connection；A, B, C three-phase bus
（1）Shunt circuitbreaker is set gradually in the branch separated（7）And zero sequence current mutual inductor（8）, zero sequence current mutual inductor（8）It is defeated
Outlet connects detection of electrical leakage alarm（9）；A, B, C three-phase bus（1）Line also passes through ground detection device（5）With substation grounding
Net（11）Connection, ground detection device（5）Signal output part and vacuum circuit breaker（4）Connection.
2. transmission lines earth fault according to claim 1 investigates warning device, it is characterised in that：Vacuum circuit breaker
（4）For permanent magnet type vacuum circuit-breaker.
3. transmission lines earth fault according to claim 1 investigates warning device, it is characterised in that：The rheostat
（10）For slide rheostat.
4. transmission lines earth fault according to claim 3 investigates warning device, it is characterised in that：Slide rheostat
Standard resistance range is 0~100 Ω, and the power of slide rheostat is 30kW.
5. transmission lines earth fault according to claim 1 investigates warning device, it is characterised in that：Detection of electrical leakage is alarmed
Device（9）The indicator light and loudspeaker being connected including amplifying circuit and with amplification circuit output end.
6. transmission lines earth fault according to claim 1 investigates warning device, it is characterised in that：The transformer is
35KV30KW directly becomes.
7. warning device is investigated according to claim 1~6 any one of them transmission lines earth fault, it is characterised in that：Institute
State investigation warning device and be used for 10KV transmission lines of electricity；Ground detection device（5）For 10KV ground detection devices, shunt circuitbreaker
（7）For 10KV shunt circuitbreakers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720661743.2U CN207336683U (en) | 2017-06-08 | 2017-06-08 | Transmission lines earth fault investigates warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720661743.2U CN207336683U (en) | 2017-06-08 | 2017-06-08 | Transmission lines earth fault investigates warning device |
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| Publication Number | Publication Date |
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| CN207336683U true CN207336683U (en) | 2018-05-08 |
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| CN201720661743.2U Active CN207336683U (en) | 2017-06-08 | 2017-06-08 | Transmission lines earth fault investigates warning device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179477A (en) * | 2017-06-08 | 2017-09-19 | 国家电网公司 | Transmission lines earth fault investigates warning device |
-
2017
- 2017-06-08 CN CN201720661743.2U patent/CN207336683U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179477A (en) * | 2017-06-08 | 2017-09-19 | 国家电网公司 | Transmission lines earth fault investigates warning device |
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