CN102486518A - Direct current insulation monitoring system and method capable of reducing busbar voltage fluctuation - Google Patents
Direct current insulation monitoring system and method capable of reducing busbar voltage fluctuation Download PDFInfo
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- CN102486518A CN102486518A CN2010105808702A CN201010580870A CN102486518A CN 102486518 A CN102486518 A CN 102486518A CN 2010105808702 A CN2010105808702 A CN 2010105808702A CN 201010580870 A CN201010580870 A CN 201010580870A CN 102486518 A CN102486518 A CN 102486518A
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- ground resistance
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Abstract
The invention relates to a direct current insulation monitoring system and method capable of reducing busbar voltage fluctuation. The system comprises a balanced bridge circuit and an unbalanced bridge circuit, wherein the balanced bridge circuit comprises a positive balancing resistor to ground and a negative balancing resistor to ground; the unbalanced bridge circuit comprises a negative unbalancing resistor to ground and a positive unbalancing resistor to ground; at least one of the negative unbalancing resistor to ground and the positive unbalancing resistor to ground and the resistance of at least one of the negative unbalancing resistor to ground and the positive unbalancing resistor to ground are controllable and variable; and the resistance can vary continuously or stepwise. When direct current insulation monitoring is carried out, the positive and negative unbalancing resistors to ground are varied continuously or stepwise to measure the positive and negative voltages to ground so as to compute the insulation resistance of positive and negative busbars. Overlarge momentary fluctuation of the positive and negative voltages to ground of the busbars can not be caused when insulation monitoring is carried out by the system and the method.
Description
Technical field
The present invention relates to a kind of D.C. isolation monitoring system and method that reduces the busbar voltage fluctuation, belong to direct current IT system insulating monitoring field.
Background technology
The straight-flow system of generating plant and transformer station is that control, protection, signal and aut.eq. provide power supply, and for the continuity and the reliability that guarantee to supply power, straight-flow system generally is designed to isolated neutral system, i.e. IT system.According to the designing requirement of power engineering straight-flow system, need carry out insulating monitoring to the direct current IT system.
Present most of insulation monitoring and warning device is to carry out insulating monitoring through the method that balance bridge combines with uneven bridge.Through switching unbalanced bridge, measure both positive and negative polarity magnitude of voltage over the ground when uneven bridge is in different conditions, utilize the both positive and negative polarity voltage-to-ground value of measuring to calculate positive and negative busbar insulating resistance.
Switch unbalanced bridge, can cause the fluctuation of busbar voltage.Knew from the accident information of generating plant and transformer station's feedback that the fluctuation of straight-flow system busbar voltage was too big, and protective relaying maloperation may take place in recent years.
When carrying out the bus insulation resistance measurement in the face of insulation monitoring and warning device switching electric bridge down, cause that the variable quantity of busbar voltage is analyzed.
Like Fig. 1, insulating monitoring electric bridge 1 is made up of balance bridge circuit 11 and uneven bridge circuit 12, establishes R
1=R
2=R
0, R
3=R
4=R
CSupposing the system exists insulation to descend 2, and anodal insulation against ground resistance is R
+, negative pole insulation against ground resistance is R
-, the busbar voltage of straight-flow system is U.
The course of work of measuring the bus insulation resistance value is:
1. K switch
2Break off K switch
1Break off, measure anodal voltage-to-ground U
0+With negative pole voltage-to-ground U
0-:
2. K switch
2Closure, K switch
1Break off, measure anodal voltage-to-ground U
1+With negative pole voltage-to-ground U
1-:
3. K switch
2Break off K switch
1Closure is measured anodal voltage-to-ground U
2+With negative pole voltage-to-ground U
2-:
4. K switch
1Break off, calculate anodal insulation against ground resistance R
+With negative pole insulation against ground resistance R
-:
Can calculate in K switch
1Or K
2When closed, the momentary fluctuation value of positive and negative busbar voltage-to-ground is:
Can know U
Δ 1With U
Δ 2Be about R
CElementary function, so R
CField of definition (0 ,+∞) in the time, U
Δ 1With U
Δ 2About R
CBe continuous leading.
Summary of the invention
The purpose of this invention is to provide a kind of D.C. isolation monitoring system and method, when carrying out insulating monitoring, can reduce the fluctuation of busbar voltage.
Technical solution of the present invention is:
A kind of D.C. isolation monitoring system that reduces the busbar voltage fluctuation; Comprise balance bridge circuit and uneven bridge circuit two parts; The balance bridge circuit is made up of the balance resistance that is connected on the balance resistance between bus positive pole and the ground and be connected between bus negative pole and the ground, it is characterized in that:
Said uneven bridge circuit is made up of negative pole unbalanced to ground resistance, negative pole unbalanced to ground resistance change-over switch, anodal unbalanced to ground resistance, anodal unbalanced to ground resistance change-over switch;
Negative pole unbalanced to ground resistance is connected in series and is connected between bus negative pole and the ground with negative pole unbalanced to ground resistance change-over switch; Anodal unbalanced to ground resistance is connected in series and is connected between bus positive pole and the ground with anodal unbalanced to ground resistance change-over switch;
In the negative pole unbalanced to ground resistance and anodal unbalanced to ground resistance of said uneven bridge circuit, the resistance that has a resistance at least is variable.
Further:
Said negative pole unbalanced to ground resistance is single resistance, and said negative pole unbalanced to ground resistance change-over switch is a single switch.
Said negative pole unbalanced to ground resistance is made up of through series connection or through parallel connection or through SP several resistance; Said negative pole unbalanced to ground resistance change-over switch is a plurality of switches.
Said anodal unbalanced to ground resistance is single resistance, and said anodal unbalanced to ground resistance change-over switch is a single switch.
Said anodal unbalanced to ground resistance is made up of through series connection or through parallel connection or through SP several resistance; Said anodal unbalanced to ground resistance change-over switch is a plurality of switches.
The course of work that this system carries out insulating monitoring is:
When negative pole unbalanced to ground resistance change-over switch K1 and anodal unbalanced to ground resistance change-over switch K2 all broke off, the positive and negative busbar voltage-to-ground value of measuring this moment was U
0+With U
0-
1. closed anodal unbalanced to ground resistance change-over switch K2 slowly reduces or gradually reduces the resistance of anodal unbalanced to ground resistance R 4, is R4=R when anodal unbalanced to ground resistance R 4 obtains minimum value
CThe time, the positive and negative busbar voltage-to-ground value of measuring this moment is U
1+With U
1-
2. slowly increase or progressively increase the resistance of anodal unbalanced to ground resistance R 4, when anodal unbalanced to ground resistance R 4 obtains maximal value and is R4=+ ∞ Ω, break off anodal unbalanced to ground resistance change-over switch K2;
3. closed negative pole unbalanced to ground resistance change-over switch K1 slowly reduces or gradually reduces the resistance of negative pole unbalanced to ground resistance R 3, is R3=R when negative pole unbalanced to ground resistance R 3 obtains minimum value
CThe time, the positive and negative busbar voltage-to-ground value of measuring this moment is U
2+With U
2-
4. slowly increase or progressively increase the resistance of negative pole unbalanced to ground resistance R 3, when negative pole unbalanced to ground resistance R 3 obtains maximal value and is R3=+ ∞ Ω, break off anodal unbalanced to ground resistance change-over switch K1;
5. calculate anodal insulation against ground resistance R by one of following formula
+With negative pole insulation against ground resistance R
-:
Or:
Or:
In the formula: R
0Be the resistance of balanced to ground resistance, R
CMinimum value for the resistance of anodal unbalanced to ground resistance and negative pole unbalanced to ground resistance.
When unbalanced to ground resistance R 3 or R4 field of definition (0 ,+∞) in the time, U
Δ 1With U
Δ 2About unbalanced to ground resistance R 3 or R4 is continuous leading, thus when closure over the ground behind unbalanced resistance change-over switch K1 or the K2, when unbalanced to ground resistance R 3 or R4 are slowly reduced, the transient change amount U of bus voltage-to-ground
Δ 1With U
Δ 2Less, can not cause the instantaneous excessive fluctuation of bus voltage-to-ground value.
The present invention adopts above-mentioned bridge diagram technology to carry out the D.C. isolation monitoring, can accomplish the calculating of both positive and negative polarity insulation against ground resistance; Simultaneously, when switching uneven bridge circuit, can reduce the instantaneous magnitude of a voltage fluctuation of bus voltage-to-ground.
Description of drawings
Fig. 1 is the theory diagram of insulating monitoring bridge diagram.
Fig. 2 is the theory diagram of an embodiment of insulating monitoring bridge diagram of the present invention, and uneven bridge circuit shown in the figure has only negative pole unbalanced to ground resistance.
Fig. 3 is the theory diagram of another embodiment of insulating monitoring bridge diagram of the present invention, and uneven bridge circuit shown in the figure has only anodal unbalanced to ground resistance.
Fig. 4 is the theory diagram of another embodiment of insulating monitoring bridge diagram of the present invention, and the existing negative pole unbalanced to ground of uneven bridge circuit shown in figure resistance has anodal unbalanced to ground resistance again.
Embodiment
The present invention relates to D.C. isolation monitoring system and method.
See also the theory diagram of insulating monitoring bridge diagram shown in Figure 1 earlier.Among the figure: insulating monitoring bridge diagram 1 is made up of balance bridge circuit 11 and uneven bridge circuit 12 two parts.Balance bridge circuit 11 is made up of with negative pole balanced to ground resistance R 2 anodal balanced to ground resistance R 1, anodal balanced to ground resistance R 1 connection bus anodal and ground, negative pole balanced to ground resistance R 2 connection bus negative poles and ground.Anodal balanced to ground resistance R 1 can be single resistance, also can be series, parallel or series-parallel mixed form of several resistance; Negative pole balanced to ground resistance R 2 can be single resistance, also can be series, parallel or series-parallel mixed form of several resistance, R
1=R
2=R
0
Negative pole unbalanced to ground resistance R 3 can be single resistance with anodal unbalanced to ground resistance R 4, also can be series, parallel or series-parallel mixed form of several resistance; In the negative pole unbalanced to ground resistance R of uneven bridge circuit 3 and anodal unbalanced to ground resistance R 4, the resistance that has a resistance at least is controlled, variable, and resistance can be continuously or stepped change.The minimum value of R3 and R4 is R
3=R
4=R
C
Negative pole unbalanced to ground resistance change-over switch K1 and anodal unbalanced to ground resistance change-over switch K2 can be that single switch also can be a plurality of switches; Negative pole unbalanced to ground resistance change-over switch K1 and anodal unbalanced to ground resistance change-over switch K2 can be mechanical switchs, also can be electronic switches.
Introduce specific embodiment below
Embodiment 1:
The theory diagram of embodiment 1 such as Fig. 2, insulating monitoring bridge diagram 1 is made up of balance bridge circuit 11 and uneven bridge circuit 12 two parts.Balance bridge circuit 11 is made up of with negative pole balanced to ground resistance R 2 anodal balanced to ground resistance R 1, anodal balanced to ground resistance R 1 connection bus anodal and ground, negative pole balanced to ground resistance R 2 connection bus negative poles and ground.
The course of work that this circuit carries out insulating monitoring is:
1. negative pole unbalanced to ground resistance change-over switch K1, K2 ... When Kn-2 breaks off, measure the anodal voltage-to-ground U of bus
1+With bus negative pole voltage-to-ground U
1-
2. closed successively negative pole unbalanced to ground resistance change-over switch K1, K2 ... Kn-2, to have between two switch closures one section time delay t
Δ
3. as all negative pole unbalanced to ground resistance change-over switch K1, K2 ... After the Kn-2 closure, measure the anodal voltage-to-ground U of bus
2+With bus negative pole voltage-to-ground U
2-
4. break off negative pole unbalanced to ground resistance change-over switch K1, K2 successively ... Kn-2, to have between two switches break off one section time delay t
Δ
5. be calculated as follows the anodal insulation against ground resistance R of bus
+With bus negative pole insulation against ground resistance R
-:
Negative pole unbalanced to ground resistance value field of definition (0 ,+∞) in the time, U
Δ 1With U
Δ 2About negative pole unbalanced to ground resistance value is continuous leading; So ought closed successively negative pole unbalanced to ground resistance change-over switch K1, K2 ... Kn-2; Make when negative pole unbalanced to ground resistance is stepped gradually to be reduced; Perhaps break off negative pole unbalanced to ground resistance change-over switch K1, K2 successively ... Kn-2, when making the stepped gradually increase of negative pole unbalanced to ground resistance, the transient change amount U of bus voltage-to-ground
Δ 1With U
Δ 2Less, can not cause female instantaneous excessive fluctuation to the ground wire magnitude of voltage.
Embodiment 2:
The theory diagram of embodiment 2 such as Fig. 3, insulating monitoring bridge diagram 1 is made up of balance bridge circuit 11 and uneven bridge circuit 12 two parts.Balance bridge circuit 11 is made up of with negative pole balanced to ground resistance R 2 anodal balanced to ground resistance R 1, anodal balanced to ground resistance R 1 connection bus anodal and ground, negative pole balanced to ground resistance R 2 connection bus negative poles and ground.
12 of uneven bridge circuits are by anodal unbalanced to ground resistance R 3, R4 ... Rn and anodal unbalanced to ground resistance change-over switch K1, K2 ... Kn-2 constitutes.Positive pole unbalanced to ground resistance R 3, R4 ... Rn respectively with anodal unbalanced to ground resistance change-over switch K1, K2 ... The Kn-2 serial connection, and be connected between bus negative pole and the ground.Wherein: R
1=R
2=R
0, R
3=R
4=...=R
n=(n-2) R
C
The course of work that this circuit carries out insulating monitoring is:
1. anodal unbalanced to ground resistance change-over switch K1, K2 ... When Kn-2 breaks off, measure anodal voltage-to-ground U
1+With negative pole voltage-to-ground U
1-
2. closed successively anodal unbalanced to ground resistance change-over switch K1, K2 ... Kn-2, to have between two switch closures one section time delay t
Δ
3. as all anodal unbalanced to ground resistance change-over switch K1, K2 ... After the Kn-2 closure, measure anodal voltage-to-ground U
2+With negative pole voltage-to-ground U
2-
4. break off anodal unbalanced to ground resistance change-over switch K1, K2 successively ... Kn-2, to have between two switches break off one section time delay t
Δ
5. be calculated as follows the anodal insulation against ground resistance R of bus
+With bus negative pole insulation against ground resistance R
-:
Anodal unbalanced to ground resistance value field of definition (0 ,+∞) in the time, U
Δ 1With U
Δ 2About anodal unbalanced to ground resistance value is continuous leading.So ought closed successively anodal unbalanced to ground resistance change-over switch K1, K2 ... Kn-2; Make when anodal unbalanced to ground resistance is stepped gradually to be reduced; Perhaps break off anodal unbalanced to ground resistance change-over switch K1, K2 successively ... Kn-2; When making the stepped gradually increase of anodal unbalanced to ground resistance, the transient change amount U of bus voltage-to-ground
Δ 1With U
Δ 2Less, can not cause the instantaneous excessive fluctuation of bus voltage-to-ground value.
Embodiment 3:
The theory diagram of embodiment 3 such as Fig. 4, insulating monitoring bridge diagram 1 is made up of balance bridge circuit 11 and uneven bridge circuit 12 two parts.Balance bridge circuit 11 is made up of with negative pole balanced to ground resistance R 2 anodal balanced to ground resistance R 1, anodal balanced to ground resistance R 1 connection bus anodal and ground, negative pole balanced to ground resistance R 2 connection bus negative poles and ground.
The course of work that this circuit carries out insulating monitoring is:
1. negative pole unbalanced to ground resistance change-over switch K1, K3 ... K2n-3 and anodal unbalanced to ground resistance change-over switch K2, K4 ... When K2n-2 breaks off, measure anodal voltage-to-ground U
0+With negative pole voltage-to-ground U
0-
2. closed successively anodal unbalanced to ground resistance change-over switch K2, K4 ... K2n-2, to have between two switch closures one section time delay t
Δ
3. as all anodal unbalanced to ground resistance change-over switch K2, K4 ... After the K2n-2 closure, measure anodal voltage-to-ground U
1+With negative pole voltage-to-ground U
1-
4. break off anodal unbalanced to ground resistance change-over switch K2, K4 successively ... K2n-2, to have between two switch closures one section time delay t
Δ,
5. closed successively negative pole unbalanced to ground resistance change-over switch K1, K3 ... K2n-3, to have between two switch closures one section time delay t
Δ
6. as all negative pole unbalanced to ground resistance change-over switch K1, K3 ... After the K2n-3 closure, measure anodal voltage-to-ground U
2+With negative pole voltage-to-ground U
2-
7. break off negative pole unbalanced to ground resistance change-over switch K1, K2 successively ... Kn-2, to have between two switch closures one section time delay t
Δ
8. calculate the anodal insulation against ground resistance R of bus by following formula
+With bus negative pole insulation against ground resistance R
-:
Or
Or
When positive and negative electrode unbalanced to ground resistance value field of definition (0 ,+∞) in the time, U
Δ 1With U
Δ 2About positive and negative electrode unbalanced to ground resistance value is continuous leading; So ought closed successively positive and negative electrode unbalanced to ground resistance change-over switch K2, K4 ... K2n-2 and K1, K3 ... K2n-3; Make when positive and negative electrode unbalanced to ground resistance is stepped gradually to be reduced; Perhaps break off positive and negative electrode unbalanced to ground resistance change-over switch K2, K4 successively ... K2n-2 and K1, K3 ... K2n-3, when making the stepped gradually increase of both positive and negative polarity unbalanced to ground resistance, the transient change amount U of bus voltage-to-ground
Δ 1With U
Δ 2Less, can not cause the instantaneous excessive fluctuation of bus voltage-to-ground value.
Claims (8)
1. one kind can reduce the D.C. isolation monitoring system that busbar voltage fluctuates; Comprise balance bridge circuit and uneven bridge circuit two parts; The balance bridge circuit is made up of the balance resistance that is connected on the balance resistance between bus positive pole and the ground and be connected between bus negative pole and the ground, it is characterized in that:
Said uneven bridge circuit is made up of negative pole unbalanced to ground resistance, negative pole unbalanced to ground resistance change-over switch, anodal unbalanced to ground resistance, anodal unbalanced to ground resistance change-over switch;
Negative pole unbalanced to ground resistance is connected in series and is connected between bus negative pole and the ground with negative pole unbalanced to ground resistance change-over switch; Anodal unbalanced to ground resistance is connected in series and is connected between bus positive pole and the ground with anodal unbalanced to ground resistance change-over switch;
In the negative pole unbalanced to ground resistance and anodal unbalanced to ground resistance of said uneven bridge circuit, the resistance that has a resistance at least is variable.
2. the D.C. isolation monitoring system that reduces the busbar voltage fluctuation as claimed in claim 1 is characterized in that:
Said negative pole unbalanced to ground resistance is single resistance, and said negative pole unbalanced to ground resistance change-over switch is a single switch.
3. the D.C. isolation monitoring system that reduces the busbar voltage fluctuation as claimed in claim 1 is characterized in that:
Said negative pole unbalanced to ground resistance is made up of through series connection or through parallel connection or through SP several resistance; Said negative pole unbalanced to ground resistance change-over switch is a plurality of switches.
4. the D.C. isolation monitoring system that reduces the busbar voltage fluctuation as claimed in claim 1 is characterized in that:
Said anodal unbalanced to ground resistance is single resistance, and said anodal unbalanced to ground resistance change-over switch is a single switch.
5. the D.C. isolation monitoring system that reduces the busbar voltage fluctuation as claimed in claim 1 is characterized in that:
Said anodal unbalanced to ground resistance is made up of through series connection or through parallel connection or through SP several resistance; Said anodal unbalanced to ground resistance change-over switch is a plurality of switches.
6. one kind can reduce the D.C. isolation monitoring method that busbar voltage fluctuates, and it is characterized in that may further comprise the steps:
(1) when negative pole unbalanced to ground resistance change-over switch is broken off, measures the anodal voltage-to-ground U of bus
1+With bus negative pole voltage-to-ground U
1-
(2) closed successively negative pole unbalanced to ground resistance change-over switch will have one period time delay between two change-over switch closures;
(3) after all negative pole unbalanced to ground resistance change-over switch closures, measure the anodal voltage-to-ground U of bus
2+With bus negative pole voltage-to-ground U
2-
(4) break off negative pole unbalanced to ground resistance change-over switch successively, two change-over switches will have one period time delay between breaking off;
(5) be calculated as follows the anodal insulation against ground resistance R of bus+with bus negative pole insulation against ground resistance R-:
In the formula: R
0Be the resistance of balanced to ground resistance, R
CResistance for negative pole unbalanced to ground resistance.
7. one kind can reduce the D.C. isolation monitoring method that busbar voltage fluctuates, and it is characterized in that may further comprise the steps:
When (1) anodal unbalanced to ground resistance change-over switch is broken off, measure the anodal voltage-to-ground U of bus
1+With bus negative pole voltage-to-ground U
1-
(2) closed successively anodal unbalanced to ground resistance change-over switch will have one period time delay between two change-over switch closures;
(3) after all anodal unbalanced to ground resistance change-over switch closures, measure the anodal voltage-to-ground U of bus
2+With bus negative pole voltage-to-ground U
2-
(4) break off anodal unbalanced to ground resistance change-over switch successively, two change-over switches will have one period time delay between breaking off;
(5) be calculated as follows the anodal insulation against ground resistance R of bus+with bus negative pole insulation against ground resistance R-:
In the formula: R
0Be the resistance of balanced to ground resistance, R
CResistance for anodal unbalanced to ground resistance.
8. one kind can reduce the D.C. isolation monitoring method that busbar voltage fluctuates, and it is characterized in that may further comprise the steps:
(1) when negative pole unbalanced to ground resistance change-over switch and the disconnection of anodal unbalanced to ground resistance change-over switch, measures the anodal voltage-to-ground U of bus
0+With bus negative pole voltage-to-ground U
0-
(2) closed successively anodal unbalanced to ground resistance change-over switch will have one period time delay between two change-over switch closures;
(3) after all anodal unbalanced to ground resistance change-over switch closures, measure the anodal voltage-to-ground U of bus
1+With bus negative pole voltage-to-ground U
1-
(4) break off anodal unbalanced to ground resistance change-over switch successively, two change-over switches will have one period time delay between breaking off,
(5) closed successively negative pole unbalanced to ground resistance change-over switch will have one period time delay between two change-over switch closures;
(6) after all negative pole unbalanced to ground resistance change-over switch closures, measure the anodal voltage-to-ground U of bus
2+With bus negative pole voltage-to-ground U
2-
(7) break off negative pole unbalanced to ground resistance change-over switch successively, two change-over switches will have one period time delay between breaking off;
(8) by one of following formula calculate the anodal insulation against ground resistance R of bus+with bus negative pole insulation against ground resistance R-:
Or:
Or:
In the formula: R
0Be the resistance of balanced to ground resistance, R
CResistance for anodal unbalanced to ground resistance and negative pole unbalanced to ground resistance.
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