CN103163433A - Method for monitoring insulation condition of generator stator and power distribution network on line and performing fault line selection - Google Patents
Method for monitoring insulation condition of generator stator and power distribution network on line and performing fault line selection Download PDFInfo
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- CN103163433A CN103163433A CN2013100681431A CN201310068143A CN103163433A CN 103163433 A CN103163433 A CN 103163433A CN 2013100681431 A CN2013100681431 A CN 2013100681431A CN 201310068143 A CN201310068143 A CN 201310068143A CN 103163433 A CN103163433 A CN 103163433A
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Abstract
The invention discloses a method for monitoring the insulation condition of a generator stator and a power distribution network on line and performing fault line selection, belongs to the method for monitoring the insulation condition of the generator stator or the power distribution network on line and aims to provide the method for accurately monitoring the insulation condition of the generator stator or the power distribution network on line. According to the method, a resistor is connected in series on a neutral point circuit of the generator stator or the power distribution network or between a neutral point of a voltage transformer and ground, and a voltage signal is applied to the resistor, so that a voltage signal is externally applied to the generator stator or the power distribution network; and the insulation value of the generator stator or the power distribution network relative to the ground can be calculated by measuring electrical parameters of the voltage signal, and the insulation condition can be judged according to the magnitude of the insulation value. The method is not influenced by the running mode, the distributed capacitance, the power network structure, the ground type and the like, is the method for monitoring the insulation condition of the generator stator or the power distribution network on line and performing fault line selection and avoids the accidents of the power network.
Description
Technical field
The present invention relates to a kind of method of generator or power distribution network insulation status being carried out on-line monitoring, relate in particular to a kind of on-line monitoring generator stator insulator situation, on-line monitoring power distribution network insulation status and grounding selection method thereof.
Background technology:Generator unit stator is the vitals of generator, require generator unit stator and line thereof and iron core or greatly between must the insulation; In like manner, power distribution network also requires and must insulate with the earth, so the insulation status of generator unit stator and power distribution network is directly connected to the security of operation of generator and power distribution network.Generator unit stator or power distribution network transformer neutral point be not direct ground connection generally, and it is by arc suppression coil or resistance eutral grounding.Generation current machine stator or power distribution network insulated on-line monitoring and earthing wire-selecting mainly contain following several method:
1) judge the insulation status of generator unit stator or power distribution network according to the symmetry of the size of zero sequential potential transformer voltage or three-phase voltage.When higher or insulation symmetry descended when stake resistance, the lower or three-phase voltage almost symmetry due to residual voltage was difficult to accurately judge the insulation status quality.
2) series capacitor between generator unit stator or power distribution network transformer neutral point or voltage transformer (VT) neutral point and ground, and apply to this capacitor the insulation situation that a direct current signal is monitored generator unit stator or power distribution network.But this electric capacity will with these equipment in inductance form series resonance, thereby cause superpotential, jeopardize power grid security.Through arc suppression coil or ground resistance earth, what monitor when voltage transformer (VT) neutral point also ground connection is the direct current resistance of mutual inductor, rather than the insulation resistance in affiliated electrical network for neutral point; Although can be by coming isolated DC at voltage transformer (VT) neutral point series capacitor, it and mutual inductor inductance will form series resonance equally, jeopardize power grid security.
3) apply to its generator unit stator or power distribution network the insulation situation that AC signal more than 10Hz is monitored generator unit stator or power distribution network by the transformer principle mode by generator unit stator or power distribution network transformer neutral point or voltage transformer (VT).The method can be subject to the impact of generator unit stator or power distribution network distributed capacitance, therefore generally can only monitor low-impedance earthed system; When voltage transformer (VT) neutral ground, affected by its direct current resistance larger, accuracy of detection is very low.
4) small current earthing wire-selecting method of realizing by principles such as zero-sequence current amplitude, zero sequence power direction, quintuple harmonics, first half-wave, interchange injections, owing to affected by the method for operation, distributed capacitance, electric network composition, earthing type, correct route selection rate is not high.
Summary of the invention:For the defects that exists in prior art, the present invention aims to provide a kind of generator unit stator, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof; The method not only can accurately be monitored the exhausted edge level of generator unit stator or power distribution network in real time, and can also realize accurate earthing wire-selecting.
To achieve these goals, the inventive method is by the following technical solutions: when forming the first ground loop when only having voltage transformer (VT) neutral ground or when only having generator unit stator or power distribution network transformer neutral point to form the second ground loop by arc suppression coil or ground resistance earth, resistance in series on described the first ground loop or described the second ground loop applies direct current or ac signal at the two ends of this resistance; According to the electric current that flows to generator unit stator or power distribution network
I, flow to the electric current of each branch road power distribution network
I n , and the voltage that is applied to the resistance two ends
U, calculate respectively total insulation resistance of generator unit stator or power distribution network
R d , each branch road power distribution network insulation resistance
R dn , and on this basis generator unit stator or power distribution network state of insulation are detected; If total insulation resistance
R d Less than predetermined setting valve, can judge the reduction of generator unit stator or power distribution network insulation degree or earth fault has occured; If the insulation resistance of certain branch road power distribution network
R dn Less than predetermined setting valve, can judge this branch road power distribution network insulation degree reduction or earth fault has occured.
In technique scheme, when only having voltage transformer (VT) neutral ground, resistance string is associated on the first ground loop, is direct current signal if be applied to the electric signal at this resistance two ends, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
If being applied to the electric signal at this resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network is
, each branch road power distribution network insulation resistance
When only having generator unit stator or power distribution network transformer neutral point by arc suppression coil or ground resistance earth, resistance string is associated on the second ground loop, if being applied to the electric signal at this resistance two ends is direct current signal, total insulation resistance of generator unit stator or power distribution network is
, each branch road power distribution network insulation resistance be
If being applied to the electric signal at this resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network is
, each branch road power distribution network insulation resistance
When generator unit stator or power distribution network transformer neutral point form the second ground loop, voltage transformer (VT) neutral point when also ground connection forms the first ground loop simultaneously by arc suppression coil or ground resistance earth, resistance in series on described the first ground loop or the second ground loop, Current Transformer or eliminate the impact of one of them ground loop resistance with the mode that changes ground link on the first ground loop and the second ground loop; Apply direct current or ac signal at the two ends of resistance, according to the electric current that flows to generator unit stator or power distribution network
I, flow to the electric current of each branch road power distribution network
I n , and the voltage that is applied to the resistance two ends
U, calculate respectively total insulation resistance of generator unit stator or power distribution network
R d , each branch road power distribution network insulation resistance
R dn , and on this basis generator unit stator or power distribution network state of insulation are detected; If total insulation resistance
R d Less than predetermined setting valve, can judge the reduction of generator unit stator or power distribution network insulation degree or earth fault has occured; If the insulation resistance of certain branch road power distribution network
R dn Less than predetermined setting valve, can judge this branch road power distribution network insulation degree reduction or earth fault has occured.
In technique scheme, the first ground loop and the second ground loop are passed current transformer simultaneously, be direct current signal if be applied to the electric signal at resistance two ends, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
If being applied to the electric signal at resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
Also can adopt the impact of the neutral point of voltage transformer (VT) and the mode of passing again voltage transformer (VT) after the second ground loop is in parallel being eliminated one of them ground loop resistance; At this moment, be direct current signal if be applied to the electric signal at resistance two ends, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
If being applied to the electric signal at resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
Also can adopt the secondary coil of current transformer and the secondary coil serial or parallel connection of compensation current transformer, the mode that the first ground loop, the second ground loop are passed respectively current transformer, compensation current transformer is eliminated the impact of one of them ground loop resistance.At this moment, be direct current signal if be applied to the electric signal at resistance two ends, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
If being applied to the electric signal at resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
In above-mentioned each technical scheme, when the electric signal that is applied to resistance two ends is direct current signal,
UFor being applied to the DC voltage at resistance two ends,
IFor flowing to the DC current of generator unit stator or power distribution network,
I n For flowing to
nThe DC current of bar branch road power distribution network,
nThe sequence number of branch road power distribution network in certain power distribution network,
nInteger for 〉=1.When the electric signal that is applied to resistance two ends is AC signal,
,
,
,
UFor the alternating voltage amplitude that is applied to the resistance two ends,
IFor flowing to the alternating current amplitude of generator unit stator or power distribution network,
Be the phase differential between alternating voltage and alternating current,
I n For flowing to
nThe amplitude of the alternating current of bar branch road power distribution network,
n For alternating voltage with flow to the
nPhase differential between the alternating current of bar branch road power distribution network,
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
In above-mentioned each technical scheme, due to the resistance of voltage transformer (VT), generator unit stator or power distribution network transformer, branch road power distribution network, arc suppression coil or impedance and stake resistance all lower, all ignore.
Compared with the prior art, the inventive method has been owing to having adopted technique scheme, but the integral insulation level of Real-Time Monitoring generator unit stator, distribution network system not only, and can also accurately be grounded route selection; The inventive method is not subjected to the impact of the method for operation, distributed capacitance, electric network composition, earthing type.
Description of drawings:
Fig. 1 is the structural representation of generator unit stator or power distribution network when only having voltage transformer (VT) neutral ground and adscititious DC current;
Fig. 2 is the structural representation of generator unit stator or power distribution network when only having voltage transformer (VT) neutral ground and adding AC signal;
Fig. 3 is the structural representation that only has generator unit stator or power distribution network transformer neutral point generator unit stator or power distribution network when arc suppression coil or ground resistance earth and adscititious DC current;
Fig. 4 is the structural representation of generator unit stator or power distribution network when only having generator unit stator or power distribution network transformer neutral point through arc suppression coil or ground resistance earth and adding AC signal;
The structural representation one of Fig. 5 generator unit stator that is generator unit stator or power distribution network transformer neutral point when arc suppression coil or ground resistance earth and voltage transformer (VT) neutral point also ground connection, adscititious DC current or power distribution network;
The structural representation two of Fig. 6 generator unit stator that is generator unit stator or power distribution network transformer neutral point when arc suppression coil or ground resistance earth and voltage transformer (VT) neutral point also ground connection, adscititious DC current or power distribution network;
The structural representation three of Fig. 7 generator unit stator that is generator unit stator or power distribution network transformer neutral point when arc suppression coil or ground resistance earth and voltage transformer (VT) neutral point also ground connection, adscititious DC current or power distribution network;
Fig. 8 is generator unit stator or power distribution network transformer neutral point through arc suppression coil or ground resistance earth and voltage transformer (VT) neutral point also ground connection, the structural representation one of generator unit stator or power distribution network when adding AC signal;
Fig. 9 is generator unit stator or power distribution network transformer neutral point through arc suppression coil or ground resistance earth and voltage transformer (VT) neutral point also ground connection, the structural representation two of generator unit stator or power distribution network when adding AC signal;
Figure 10 is generator unit stator or power distribution network transformer neutral point through arc suppression coil or ground resistance earth and voltage transformer (VT) neutral point also ground connection, the structural representation three of generator unit stator or power distribution network when adding AC signal.
In figure: generator unit stator or power distribution network transformer 1 branch road power distribution network 2 current transformer 3 resistance 4 direct current signal 5 voltage transformer (VT) 6 arc suppression coils or stake resistance 7 AC signal 8 compensation current transformers 9
Embodiment:The invention will be further described below in conjunction with accompanying drawing and specific embodiment:
Embodiment 1
As shown in Figure 1: generator unit stator or power distribution network transformer 1 are electrically connected to branch road power distribution network 2, and voltage transformer (VT) 6 is connected between the output terminal of generator unit stator or power distribution network transformer 1 and the earth and forms the first ground loop; The resistance 4 that two ends are applied with direct current signal 5 is connected between the neutral point and the earth of voltage transformer (VT) 6 (being that resistance 4 is connected on described the first ground loop).Current Transformer 3 is measured respectively the electric current that flows to generator unit stator or power distribution network transformer 1
I, flow to
nThe electric current of bar branch road power distribution network 2
I n , and according to the voltage that is applied to resistance 4 two ends
U, calculate generator unit stator or power distribution network transformer 1 with respect to total insulation resistance of the earth in the situation that disregard voltage transformer (VT) 6 resistance
, and
nBar branch road power distribution network 2 is with respect to the insulation resistance of the earth
nThe sequence number of certain branch road power distribution network 2,
nInteger for 〉=1.
With
R d For according to the state of insulation of generator unit stator or power distribution network is detected, with
R dn For detecting according to the state of insulation to each branch road power distribution network 2; If total insulation resistance
R d Less than predetermined setting valve, can judge the insulation degree reduction of generator unit stator or power distribution network transformer 1 or earth fault has occured; If the insulation resistance of certain branch road power distribution network 2
R dn Less than predetermined setting valve, can judge the insulation degree reduction of this branch road power distribution network 2 or earth fault has occured.
As shown in Figure 2: substitute direct current signal 5 with AC signal 8 on the basis of embodiment 1, in the situation that consider the distributed capacitance impact and disregard voltage transformer (VT) 6 impedances and calculate generator unit stator or power distribution network transformer 1 with respect to total insulation resistance of the earth
, and
nBar branch road power distribution network 2 is with respect to the insulation resistance of the earth
In above-mentioned two formulas:
,
,
,
UFor being applied to the alternating voltage amplitude at resistance 4 two ends,
IFor flowing to the alternating current amplitude of generator unit stator or power distribution network transformer 1,
Be the phase differential between alternating voltage and alternating current,
I n For flowing to
nThe alternating current amplitude of bar branch road power distribution network 2,
n For alternating voltage with flow to the
nPhase differential between the alternating current of bar branch road power distribution network 2,
nThe sequence number of certain branch road power distribution network 2,
nInteger for 〉=1.
As shown in Figure 3: generator unit stator or power distribution network transformer 1 are electrically connected to branch road power distribution network 2, the neutral point of generator unit stator or power distribution network transformer 1 forms the second ground loop by arc suppression coil or stake resistance 7 ground connection, and the resistance 4 that two ends are applied with direct current signal 5 is connected between the neutral point of generator unit stator or power distribution network transformer 1 and the earth or is connected between the neutral point and arc suppression coil or stake resistance 7 of generator unit stator or power distribution network transformer 1 (being that resistance 4 is connected on described the second ground loop).Current Transformer 3 is measured respectively the electric current that flows to generator unit stator or power distribution network transformer 1
I, flow to
nThe electric current of bar branch road power distribution network 2
I n , and according to the voltage that is applied to resistance 4 two ends
U, calculate generator unit stator or power distribution network transformer 1 with respect to total insulation resistance of the earth
, and
nBar branch road power distribution network 2 is with respect to the insulation resistance of the earth
nThe sequence number of certain branch road power distribution network 2,
nInteger for 〉=1.
With
R d For according to the state of insulation of generator unit stator or power distribution network is detected, with
R dn For detecting according to the state of insulation to each branch road power distribution network 2; If total insulation resistance
R d Less than predetermined setting valve, can judge the insulation degree reduction of generator unit stator or power distribution network transformer 1 or earth fault has occured; If the insulation resistance of certain branch road power distribution network 2
R dn Less than predetermined setting valve, can judge the insulation degree reduction of this branch road power distribution network 2 or earth fault has occured.
As shown in Figure 4: substitute direct current signal 5 with AC signal 8 on the basis of embodiment 3, considering the distributed capacitance impact, disregarding and calculate generator unit stator or power distribution network transformer 1 in the impedance situation of generator unit stator or power distribution network transformer 1 and arc suppression coil or stake resistance 7 with respect to total insulation resistance of the earth
, and
nBar branch road power distribution network 2 is with respect to the insulation resistance of the earth
In above-mentioned two formulas:
,
,
,
UFor being applied to the alternating voltage amplitude at resistance 4 two ends,
IFor flowing to the alternating current amplitude of generator unit stator or power distribution network transformer 1,
Be the phase differential between alternating voltage and alternating current,
I n For flowing to
nThe alternating current amplitude of bar branch road power distribution network 2,
n For alternating voltage with flow to the
nPhase differential between the alternating current of bar branch road power distribution network 2,
nThe sequence number of certain branch road power distribution network 2,
nInteger for 〉=1.
Embodiment 5
As shown in Figure 5: generator unit stator or power distribution network transformer 1 are electrically connected to branch road power distribution network 2, generator unit stator or power distribution network transformer 1 neutral point by arc suppression coil or stake resistance 7 ground connection form the second ground loop, simultaneously voltage transformer (VT) 6 neutral points also ground connection form the first ground loop; Described the first ground loop and described the second ground loop are passed current transformer 3 simultaneously offsetting the ground current in the first ground loop neutral ground loop, and the resistance 4 that two ends are applied with direct current signal 5 is connected between the neutral point of generator unit stator or power distribution network transformer 1 and the earth or is connected between the neutral point and arc suppression coil or stake resistance 7 of generator unit stator or power distribution network transformer 1 (being that resistance 4 is connected on described the second ground loop) or is connected on the first ground loop.Current Transformer 3 is measured respectively the electric current that flows to generator unit stator or power distribution network transformer 1
I, flow to
nThe electric current of bar branch road power distribution network 2
I n , and according to the voltage that is applied to resistance 4 two ends
U(disregarding the resistance of the first ground loop and the second ground loop) calculates generator unit stator or power distribution network transformer 1 with respect to total insulation resistance of the earth
, and
nBar branch road power distribution network 2 is with respect to the insulation resistance of the earth
nThe sequence number of certain branch road power distribution network 2,
nInteger for 〉=1.
With
R d For according to the state of insulation of generator unit stator or power distribution network is detected, with
R dn For detecting according to the state of insulation to each branch road power distribution network 2; If total insulation resistance
R d Less than predetermined setting valve, can judge the insulation degree reduction of generator unit stator or power distribution network transformer 1 or earth fault has occured; If the insulation resistance of certain branch road power distribution network 2
R dn Less than predetermined setting valve, can judge the insulation degree reduction of this branch road power distribution network 2 or earth fault has occured.
As shown in Figure 6: also can adopt the impact of the neutral point of voltage transformer (VT) 6 and the mode of passing again voltage transformer (VT) after the second ground loop is in parallel being eliminated one of them ground loop resistance on the basis of embodiment 5.
As shown in Figure 7: also can adopt on the basis of embodiment 5 secondary coil of current transformer 3 and the secondary coil serial or parallel connection of compensation current transformer 9, the mode that the first ground loop, the second ground loop are passed respectively current transformer 3, compensation current transformer 9 is eliminated the impact of one of them ground loop resistance.
Embodiment 8
As shown in Figure 8: substitute direct current signal 5 with AC signal 8 on the basis of embodiment 5, considering the distributed capacitance impact, disregarding in the first ground loop and described the second ground loop impedance situation, calculate generator unit stator or power distribution network transformer 1 with respect to total insulation resistance of the earth
And the
nBar branch road power distribution network 2 is with respect to the insulation resistance of the earth
In above-mentioned two formulas:
,
,
,
UFor being applied to the alternating voltage amplitude at resistance 4 two ends,
IFor flowing to the alternating current amplitude of generator unit stator or power distribution network transformer 1,
Be the phase differential between alternating voltage and alternating current,
I n For flowing to
nThe alternating current amplitude of bar branch road power distribution network 2,
n For alternating voltage with flow to the
nPhase differential between the alternating current of bar branch road power distribution network 2,
nThe sequence number of certain branch road power distribution network 2,
nInteger for 〉=1.
Embodiment 9
As shown in Figure 9: also can adopt the impact of the neutral point of voltage transformer (VT) 6 and the mode of passing again voltage transformer (VT) after the second ground loop is in parallel being eliminated one of them ground loop resistance on the basis of embodiment 8.
Embodiment 10
As shown in figure 10: also can adopt on the basis of embodiment 8 secondary coil of current transformer 3 and the secondary coil serial or parallel connection of compensation current transformer 9, the mode that the first ground loop, the second ground loop are passed respectively current transformer 3, compensation current transformer 9 is eliminated the impact of one of them ground loop resistance.
Claims (12)
1. a generator unit stator, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: when forming the first ground loop when only having voltage transformer (VT) neutral ground or when only having generator unit stator or power distribution network transformer neutral point to form the second ground loop by arc suppression coil or ground resistance earth, resistance in series on described the first ground loop or described the second ground loop applies direct current or ac signal at the two ends of this resistance; According to the electric current that flows to generator unit stator or power distribution network
I, flow to the electric current of each branch road power distribution network
I n , and the voltage that is applied to the resistance two ends
U, calculate respectively total insulation resistance of generator unit stator or power distribution network
R d , each branch road power distribution network insulation resistance
R dn , and on this basis generator unit stator or power distribution network state of insulation are detected; If total insulation resistance
R d Less than predetermined setting valve, can judge the reduction of generator unit stator or power distribution network insulation degree or earth fault has occured; If the insulation resistance of certain branch road power distribution network
R dn Less than predetermined setting valve, can judge this branch road power distribution network insulation degree reduction or earth fault has occured.
2. generator unit stator according to claim 1, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: resistance string is associated on the first ground loop, the electric signal that is applied to this resistance two ends is direct current signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
3. generator unit stator according to claim 1, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: resistance string is associated on the first ground loop, the electric signal that is applied to this resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
Wherein,
,
,
Be the phase differential between alternating voltage and alternating current; The insulation resistance of each branch road power distribution network
Wherein,
,
,
n For alternating voltage with flow to the
nPhase differential between the alternating current of individual branch road power distribution network,
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
4. generator unit stator according to claim 1, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: resistance string is associated on the second ground loop, the electric signal that is applied to this resistance two ends is direct current signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
5. generator unit stator according to claim 1, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: resistance string is associated on the second ground loop, the electric signal that is applied to this resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
Wherein,
,
,
Be the phase differential between alternating voltage and alternating current; The insulation resistance of each branch road power distribution network
Wherein,
,
,
n For alternating voltage with flow to the
nPhase differential between the alternating current of individual branch road power distribution network,
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
6. a generator unit stator, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: when generator unit stator or power distribution network transformer neutral point form the second ground loop, voltage transformer (VT) neutral point when also ground connection forms the first ground loop simultaneously by arc suppression coil or ground resistance earth, resistance in series on described the first ground loop or the second ground loop, Current Transformer or eliminate the impact of one of them ground loop resistance with the mode that changes ground link on the first ground loop and the second ground loop; Apply direct current or ac signal at the two ends of resistance, according to the electric current that flows to generator unit stator or power distribution network
I, flow to the electric current of each branch road power distribution network
I n , and the voltage that is applied to the resistance two ends
U, calculate respectively total insulation resistance of generator unit stator or power distribution network
R d , each branch road power distribution network insulation resistance
R dn , and on this basis generator unit stator or power distribution network state of insulation are detected; If total insulation resistance
R d Less than predetermined setting valve, can judge the reduction of generator unit stator or power distribution network insulation degree or earth fault has occured; If the insulation resistance of certain branch road power distribution network
R dn Less than predetermined setting valve, can judge this branch road power distribution network insulation degree reduction or earth fault has occured.
7. generator unit stator according to claim 6, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: the first ground loop and the second ground loop are passed current transformer simultaneously, the electric signal that is applied to resistance two ends is direct current signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
8. generator unit stator according to claim 6, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: with the neutral point of voltage transformer (VT) with pass again voltage transformer (VT) after the second ground loop is in parallel, the electric signal that is applied to resistance two ends is direct current signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
9. generator unit stator according to claim 6, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: with the secondary coil of current transformer and the secondary coil serial or parallel connection of compensation current transformer, the first ground loop, the second ground loop are passed respectively current transformer, compensation current transformer, the electric signal that is applied to resistance two ends is direct current signal, total insulation resistance of generator unit stator or power distribution network
, each branch road power distribution network insulation resistance
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
10. generator unit stator according to claim 6, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: the first ground loop and the second ground loop are passed current transformer simultaneously, the electric signal that is applied to resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
Wherein,
,
,
Be the phase differential between alternating voltage and alternating current; The insulation resistance of each branch road power distribution network
Wherein,
,
,
n For alternating voltage with flow to the
nPhase differential between the alternating current of individual branch road power distribution network,
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
11. generator unit stator according to claim 6, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: with the neutral point of voltage transformer (VT) with pass again voltage transformer (VT) after the second ground loop is in parallel, the electric signal that is applied to resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
Wherein,
,
,
Be the phase differential between alternating voltage and alternating current; The insulation resistance of each branch road power distribution network
Wherein,
,
,
n For alternating voltage with flow to the
nPhase differential between the alternating current of individual branch road power distribution network,
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
12. generator unit stator according to claim 6, power distribution network insulated on-line monitoring and earthing wire-selecting method thereof, it is characterized in that: with the secondary coil of current transformer and the secondary coil serial or parallel connection of compensation current transformer, the first ground loop, the second ground loop are passed respectively current transformer or compensation current transformer, the electric signal that is applied to resistance two ends is AC signal, total insulation resistance of generator unit stator or power distribution network
Wherein,
,
,
Be the phase differential between alternating voltage and alternating current; The insulation resistance of each branch road power distribution network
Wherein,
,
,
n For alternating voltage with flow to the
nPhase differential between the alternating current of individual branch road power distribution network,
nThe sequence number of certain branch road power distribution network,
nInteger for 〉=1.
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|---|---|---|---|
| CN2013100681431A CN103163433A (en) | 2013-03-05 | 2013-03-05 | Method for monitoring insulation condition of generator stator and power distribution network on line and performing fault line selection |
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|---|---|---|---|
| CN2013100681431A CN103163433A (en) | 2013-03-05 | 2013-03-05 | Method for monitoring insulation condition of generator stator and power distribution network on line and performing fault line selection |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439656A (en) * | 2013-06-27 | 2013-12-11 | 广东电网公司电力科学研究院 | Generator stator winding and electric major loop grounding fault diagnosis method of generator stator winding based on flow direction of failure current |
| CN108872779A (en) * | 2017-08-28 | 2018-11-23 | 武汉都市环保工程技术股份有限公司 | A kind of single-phase earth fault line selection device and method |
| CN109991467A (en) * | 2017-12-29 | 2019-07-09 | 西门子股份公司 | The confirmation of overvoltage |
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| CN110596583B (en) * | 2019-07-09 | 2023-10-17 | 国网江苏省电力有限公司徐州供电分公司 | Variable frequency motor stator fault detection system and detection method based on zero sequence voltage analysis |
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| CN113949319A (en) * | 2021-09-23 | 2022-01-18 | 华中科技大学 | Generator stator single-phase earth fault arc extinction method and system |
| CN113949319B (en) * | 2021-09-23 | 2023-11-14 | 华中科技大学 | Single-phase earth fault arc extinction method and system for generator stator |
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