CN107677906A - A kind of transformer station direct current system failure detector circuit and inspection method - Google Patents

A kind of transformer station direct current system failure detector circuit and inspection method Download PDF

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Publication number
CN107677906A
CN107677906A CN201710918709.3A CN201710918709A CN107677906A CN 107677906 A CN107677906 A CN 107677906A CN 201710918709 A CN201710918709 A CN 201710918709A CN 107677906 A CN107677906 A CN 107677906A
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China
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mrow
msubsup
prime
msub
relay
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CN201710918709.3A
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CN107677906B (en
Inventor
李辰龙
蒋琛
杜先波
郝宝欣
顾文
唐铭
唐一铭
刘亚南
储海军
喻建
王�琦
谭敏刚
魏邦城
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Jiangsu Fangtian Power Technology Co Ltd
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Jiangsu Fangtian Power Technology Co Ltd
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Priority to CN201710918709.3A priority Critical patent/CN107677906B/en
Publication of CN107677906A publication Critical patent/CN107677906A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Abstract

The invention discloses a kind of transformer station direct current system failure detector circuit, also disclose a kind of transformer station direct current system fault detection method, the break-make of relay in control circuit, measure the data to be measured under different conditions, calculate the value of positive and negative bus equivalent resistance over the ground, judgement system whether there is earth fault, control the break-make for the condenser network being connected respectively with positive and negative bus, measure the size of testing resistance alternating voltage, by the testing resistance alternating voltage size measured, judge that straight-flow system scurries into failure with the presence or absence of exchange.

Description

A kind of transformer station direct current system failure detector circuit and inspection method
Technical field
The present invention relates to a kind of failure detector circuit, and in particular to transformer station direct current system exchange is scurried into be examined with earth fault Slowdown monitoring circuit further relates to transformer station direct current system and exchanges the inspection method scurried into ground fault detection circuit.Art of the present invention Circuit is detected for substation fault.
Background technology
Transformer station direct current system is power-supply system important in transformer station, in terms of the safe and stable operation of transformer station is ensured Play vital effect.Therefore, the power supply reliability of straight-flow system directly affects whole transformer station or even the fortune of power network Row safety.With the continuous development of power network, the continuous improvement of voltage class, higher requirement is it is also proposed to straight-flow system.
DC system earth fault may cause the problems such as malfunction of direct current protecting outlet loop, protection device tripping, and hand over Flee to may result in DC system grounding into failure, cause false protection, tripping；Protective relaying device failure, accident scope Expand；Relay perseveration, system operation confusion etc..Current detection method can only detect to a kind of failure mostly, The efficiency of fault detect is reduced, adds testing cost.
The content of the invention
To solve the deficiencies in the prior art, it is an object of the invention to provide a kind of transformer station direct current system fault detect electricity Road and inspection method, by linkage disequilibrium bridge method and the characteristic of electric capacity separated by direct communication, so as to solve transformer station direct current system The problem of exchange is scurried into and Earth Fault Detection can not carry out fault detect simultaneously.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：A kind of transformer station direct current system fault detect Circuit and inspection method, including resistor R1, resistor R1 one end connection positive bus-bar, the resistor R1 other ends connect resistance respectively Device R2 one end, electric capacity C1 one end, relay K4 one end；Relay K4 other ends connection electric capacity C1 one end；Resistor The R2 other ends connect resistor R3 one end, resistor R5 one end, relay K3 one end respectively, and are grounded；Resistor R3 The other end connects resistor R4 one end, electric capacity C2 one end respectively；Relay K5 one end connection electric capacity C2 one end, relay K5 other ends connection resistor R4 one end；Resistor R5 other ends connection resistor R6 one end；The resistor R6 other ends point Not Lian Jie relay K3 one end, relay K1 one end, relay K2 one end, and be grounded；The relay K1 other ends connect Resistor R7 one end；Resistor R7 other ends connection resistor R1 one end；Relay K2 other ends connection resistor R8's One end；Resistor R8 other ends connection resistor R4 one end；Resistor R2 both ends are connected with first voltage measurement apparatus；Resistance Device R5 both ends are connected with second voltage measurement apparatus；The one the second of first voltage measurement apparatus and second voltage measurement apparatus are only In order to which voltage measuring apparatus is made a distinction.
A kind of detection method of foregoing transformer station direct current system failure detector circuit, it is characterised in that：Including following step Suddenly：
Step 1：The break-make of relay in control circuit, the data to be measured under different conditions are measured, are calculated positive and negative The value of bus equivalent resistance over the ground；
Step 2：By the value of the positive and negative bus that calculates equivalent resistance over the ground, judge that system whether there is earth fault；
Step 3：The break-make for the condenser network being connected respectively with positive and negative bus is controlled, measurement testing resistance alternating voltage Size；
Step 4：By the testing resistance alternating voltage size measured, judge that straight-flow system scurries into failure with the presence or absence of exchange.
A kind of detection method of foregoing transformer station direct current system failure detector circuit, it is characterised in that：Step 1 includes Following steps：Step 1a：Closing relay K1, relay K3, disconnect relay K2, relay K4, relay K5, and measurement is to be measured Resistive voltage, it is designated as u '1；Closing relay K2, relay K3, disconnect relay K1, relay K4, relay K5, and measurement is treated Measuring resistance voltage, it is designated as u "1；
Step 1b：R+ is made to represent that the grounding resistance between positive bus-bar and the earth, R-+ are represented between negative busbar and the earth Grounding resistance, U are busbar voltage, U+For positive pole line-to-earth voltage, U-For negative busbar voltage-to-ground, then U=U++U-, wherein R=R1 +R2,
By measured value u '1、u″1It can obtain：
By the value of the positive and negative bus that calculates equivalent resistance over the ground, judge that system whether there is earth fault.
A kind of detection method of foregoing transformer station direct current system failure detector circuit, it is characterised in that：Step 3 includes Following steps：Step 3a：Relay K1, relay K2, relay K3, relay K5, closing relay K4 are disconnected, measurement is to be measured The voltage swing of resistance, is designated as u '2；Relay K1, relay K2, relay K3, relay K4, closing relay K5 are disconnected, The voltage swing of testing resistance is measured, is designated as u "2；
Step 3b：R+ is made to represent that the grounding resistance between positive bus-bar and the earth, R-+ are represented between negative busbar and the earth Grounding resistance, U56For resistance R5、R6The alternating voltage of place circuit,For resistance R2Voltage, UR3For resistance R3The electricity at both ends Pressure, U±ACThe value of alternating voltage, I are scurried into for positive and negative bus1To pass through resistance R1Electric current, I3To pass through resistance R3Electric current, I5 To pass through resistance R5Alternating current；
When circuit, which is in positive bus-bar exchange, scurries into detection, by the u ' measured2It can obtain：
U′56=(R5+R6)×I′5；
When circuit, which is in negative busbar exchange, scurries into detection, by the u measured "2It can obtain：
U″56=(R5+R6)×I″5；
The value U of alternating voltage is scurried into by the positive and negative bus calculated+AC、U-AC, judge that straight-flow system is altered with the presence or absence of exchange Enter failure.
The present invention is advantageous in that：Realize DC system earth fault and exchange the detection of scurrying into failure, operation letter Single, cost is low.
Brief description of the drawings
Fig. 1 is a kind of transformer station direct current system failure detector circuit figure of the present invention；
Fig. 2 is closing relay K1, relay K3 in a kind of transformer station direct current system failure detector circuit of the present invention, is disconnected The isoboles of circuit when relay K2, relay K4, relay K5；
Fig. 3 is closing relay K2, relay K3 in a kind of transformer station direct current system failure detector circuit of the present invention, is disconnected The isoboles of circuit when relay K1, relay K4, relay K5；
Fig. 4 is a kind of flow chart of the detection method of transformer station direct current system failure detector circuit of the present invention；
Fig. 5 is that detection isoboles is scurried into positive bus-bar exchange of the present invention；
Fig. 6 is that detection isoboles is scurried into negative busbar exchange of the present invention.
Embodiment
Make specific introduce to the present invention below in conjunction with the drawings and specific embodiments.
Shown in reference picture 1, a kind of transformer station direct current system failure detector circuit of the present invention, including resistor R1, resistor R1 one end connects positive bus-bar, and the resistor R1 other ends connect resistor R2 one end, electric capacity C1 one end, relay K4 respectively One end；Relay K4 other ends connection electric capacity C1 one end；The resistor R2 other ends connect resistor R3 one end, resistance respectively Device R5 one end, relay K3 one end, and be grounded；The resistor R3 other ends connect resistor R4 one end, electric capacity C2 respectively One end；Relay K5 one end connection electric capacity C2 one end, relay K5 other ends connection resistor R4 one end；Resistor R5 Other end connection resistor R6 one end；The resistor R6 other ends connect respectively relay K3 one end, relay K1 one end, Relay K2 one end, and be grounded；Relay K1 other ends connection resistor R7 one end；The resistor R7 other ends connect resistance Device R1 one end；Relay K2 other ends connection resistor R8 one end；Resistor R8 other ends connection resistor R4 one end； Resistor R2 both ends are connected with first voltage measurement apparatus；Resistor R5 both ends are connected with second voltage measurement apparatus；First electricity The one the second of pressure measuring device and second voltage measurement apparatus are only for voltage measuring apparatus is made a distinction.
Shown in reference picture 2, Fig. 3, a kind of transformer station direct current system failure detector circuit of the present invention, by transforming plant DC Improved DC system fault detection circuit is accessed on the positive and negative bus of system, control detects each relay in circuit Break-make, change the state of measuring circuit, realize DC system earth fault and exchange the detection of scurrying into failure, concrete operations mode It is as follows：
Detection circuit is arranged to resistance to earth measuring state, closing relay K1, relay K3, disconnect relay K2, Relay K4, relay K5, measure testing resistance voltage, record data；Closing relay K2, relay K3, disconnect relay K1, relay K4, relay K5, measure testing resistance voltage, record data；By calculating data, judge that system is It is no earth fault to be present；
Detection circuit is arranged to exchange and scurries into detection state, disconnects relay K1, relay K2, relay K3, relay Device K5, closing relay K4, measure the voltage swing of testing resistance, record data；Disconnect relay K1, relay K2, relay Device K3, relay K4, closing relay K5, measure the voltage swing of testing resistance, record data；Handed over by the testing resistance measured Voltage swing is flowed, the positive and negative bus calculated scurries into the value of alternating voltage, judges that straight-flow system scurries into event with the presence or absence of exchange Barrier.
Shown in reference picture 4, Fig. 5, Fig. 6, one is also proposed based on a kind of foregoing transformer station direct current system failure detector circuit The detection method of kind transformer station direct current system failure detector circuit, it is characterised in that：Comprise the following steps：
Step 1：The break-make of relay in control circuit, the data to be measured under different conditions are measured, are calculated positive and negative The value of bus equivalent resistance over the ground；Step 1 also comprises the following steps：
Step 1a：Closing relay K1, relay K3, disconnect relay K2, relay K4, relay K5, and measurement is to be measured Resistive voltage, it is designated as u '1；Closing relay K2, relay K3, disconnect relay K1, relay K4, relay K5, and measurement is treated Measuring resistance voltage, it is designated as u "1；
Step 1b：R+ is made to represent that the grounding resistance between positive bus-bar and the earth, R-+ are represented between negative busbar and the earth Grounding resistance, U are busbar voltage, U+For positive pole line-to-earth voltage, U-For negative busbar voltage-to-ground, then U=U++U-, wherein R=R1 +R2,
By measured value u '1、u″1It can obtain：
Step 2：By the value of the positive and negative bus that calculates equivalent resistance over the ground, judge that system whether there is earth fault；
Step 3：The break-make for the condenser network being connected respectively with positive and negative bus is controlled, measurement testing resistance alternating voltage Size；
Step 3 also comprises the following steps：
Step 3a：Relay K1, relay K2, relay K3, relay K5, closing relay K4 are disconnected, measurement is to be measured The voltage swing of resistance, is designated as u '2；Relay K1, relay K2, relay K3, relay K4, closing relay K5 are disconnected, The voltage swing of testing resistance is measured, is designated as u "2；
Step 3b：R+ is made to represent that the grounding resistance between positive bus-bar and the earth, R-+ are represented between negative busbar and the earth Grounding resistance, U56For resistance R5、R6The alternating voltage of place circuit,For resistance R2Voltage, UR3For resistance R3The electricity at both ends Pressure, U±ACThe value of alternating voltage, I are scurried into for positive and negative bus1To pass through resistance R1Electric current, I3To pass through resistance R3Electric current, I5 To pass through resistance R5Alternating current；
When circuit, which is in positive bus-bar exchange, scurries into detection, by the u ' measured2It can obtain：
U′56=(R5+R6)×I′5；
When circuit, which is in negative busbar exchange, scurries into detection, by the u measured "2It can obtain：
U″56=(R5+R6)×I″5；
Step 4：By the testing resistance alternating voltage size measured, the positive and negative bus calculated scurries into the value of alternating voltage U+AC、U-AC, judge that straight-flow system scurries into failure with the presence or absence of exchange.
The present invention detects electricity by accessing improved DC system fault on the positive and negative bus of transformer station direct current system Road, the break-make of each relay of control detection circuit, changes the state of measuring circuit, realizes DC system earth fault and friendship Flee the detection into failure.
The basic principles, principal features and advantages of the present invention have been shown and described above.The technical staff of the industry should Understand, the invention is not limited in any way for above-described embodiment, all to be obtained by the way of equivalent substitution or equivalent transformation Technical scheme, all fall within protection scope of the present invention.

Claims (4)

  1. A kind of 1. transformer station direct current system failure detector circuit, it is characterised in that：Including resistor R1, the connection of resistor R1 one end Positive bus-bar, the resistor R1 other ends connect resistor R2 one end, electric capacity C1 one end, relay K4 one end respectively；Relay Device K4 other ends connection electric capacity C1 one end；The resistor R2 other ends connect resistor R3 one end, the one of resistor R5 respectively End, relay K3 one end, and be grounded；The resistor R3 other ends connect resistor R4 one end, electric capacity C2 one end respectively；After Electrical equipment K5 one end connection electric capacity C2 one end, relay K5 other ends connection resistor R4 one end；The resistor R5 other ends connect Termination resistor R6 one end；The resistor R6 other ends connect relay K3 one end, relay K1 one end, relay K2 respectively One end；Relay K1 other ends connection resistor R7 one end；Resistor R7 other ends connection resistor R1 one end；Relay Device K2 other ends connection resistor R8 one end；Resistor R8 other ends connection resistor R4 one end；Resistor R2 both ends connect It is connected to first voltage measurement apparatus；Resistor R5 both ends are connected with second voltage measurement apparatus.
  2. A kind of 2. detection method of transformer station direct current system failure detector circuit described in claim 1, it is characterised in that：Including Following steps：
    Step 1：The break-make of relay in control circuit, the data to be measured under different conditions are measured, calculate positive and negative bus The value of equivalent resistance over the ground；
    Step 2：By the value of the positive and negative bus that calculates equivalent resistance over the ground, judge that system whether there is earth fault；
    Step 3：The break-make for the condenser network being connected respectively with positive and negative bus is controlled, measures the big of testing resistance alternating voltage It is small；
    Step 4：By the testing resistance alternating voltage size measured, judge that straight-flow system scurries into failure with the presence or absence of exchange.
  3. A kind of 3. detection method of transformer station direct current system failure detector circuit according to claim 2, it is characterised in that： Step 1 comprises the following steps：
    Step 1a：Closing relay K1, relay K3, relay K2, relay K4, relay K5 are disconnected, measure testing resistance Voltage, it is designated as u '1；Closing relay K2, relay K3, relay K1, relay K4, relay K5 are disconnected, measures electricity to be measured Voltage is hindered, is designated as u "1；
    Step 1b：R+ is made to represent that the grounding resistance between positive bus-bar and the earth, R-+ represent the ground connection between negative busbar and the earth Resistance, U are busbar voltage, U+For positive pole line-to-earth voltage, U-For negative busbar voltage-to-ground, then U=U++U-, wherein R=R1+R2
    By measured value u '1、u″1It can obtain：
    <mrow> <msup> <mi>U</mi> <mo>&amp;prime;</mo> </msup> <mo>=</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>4</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> </mfrac> <mo>&amp;times;</mo> <msubsup> <mi>u</mi> <mn>1</mn> <mo>&amp;prime;</mo> </msubsup> <mo>;</mo> </mrow>
    <mrow> <msubsup> <mi>U</mi> <mo>-</mo> <mo>&amp;prime;</mo> </msubsup> <mo>=</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>4</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> </mfrac> <mo>&amp;times;</mo> <msubsup> <mi>u</mi> <mn>1</mn> <mo>&amp;prime;</mo> </msubsup> <mo>;</mo> </mrow>
    <mrow> <msup> <mi>U</mi> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mo>=</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>4</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> </mfrac> <mo>&amp;times;</mo> <msubsup> <mi>u</mi> <mn>1</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>;</mo> </mrow>
    <mrow> <msubsup> <mi>U</mi> <mo>-</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>=</mo> <mfrac> <mrow> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>4</mn> </msub> </mrow> <msub> <mi>R</mi> <mn>2</mn> </msub> </mfrac> <mo>&amp;times;</mo> <msubsup> <mi>u</mi> <mn>1</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>R</mi> <mo>+</mo> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>-</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>)</mo> <mi>R</mi> </mrow> <mrow> <mn>2</mn> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>-</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>+</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> </mrow> </mfrac> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>R</mi> <mo>-</mo> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>-</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>)</mo> <mi>R</mi> </mrow> <mrow> <mn>2</mn> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>-</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>+</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>+</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mo>&amp;prime;</mo> </msubsup> <mo>&amp;times;</mo> <msubsup> <mi>U</mi> <mo>-</mo> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> </mrow> </mfrac> <mo>;</mo> </mrow>
    By the value of the positive and negative bus that calculates equivalent resistance over the ground, judge that system whether there is earth fault.
  4. A kind of 4. detection method of transformer station direct current system failure detector circuit according to claim 2, it is characterised in that： Step 3 comprises the following steps：
    Step 3a：Relay K1, relay K2, relay K3, relay K5, closing relay K4 are disconnected, measures testing resistance Voltage swing, be designated as u '2；Disconnect relay K1, relay K2, relay K3, relay K4, closing relay K5, measurement The voltage swing of testing resistance, it is designated as u "2；
    Step 3b：R+ is made to represent that the grounding resistance between positive bus-bar and the earth, R-+ represent the ground connection between negative busbar and the earth Resistance, U56For resistance R5、R6The alternating voltage of place circuit,For resistance R2Voltage, UR3For resistance R3The voltage at both ends, U±ACThe value of alternating voltage, I are scurried into for positive and negative bus1To pass through resistance R1Electric current, I3To pass through resistance R3Electric current, I5For Pass through resistance R5Alternating current；
    When circuit, which is in positive bus-bar exchange, scurries into detection, by the u' measured2It can obtain：
    <mrow> <msubsup> <mi>I</mi> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> <mo>=</mo> <mfrac> <msubsup> <mi>u</mi> <mn>2</mn> <mo>&amp;prime;</mo> </msubsup> <msubsup> <mi>R</mi> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> </mfrac> <mo>;</mo> </mrow>
    U′56=(R5+R6)×I′5；
    <mrow> <msubsup> <mi>I</mi> <mn>3</mn> <mo>&amp;prime;</mo> </msubsup> <mo>=</mo> <mfrac> <msubsup> <mi>U</mi> <mn>56</mn> <mo>&amp;prime;</mo> </msubsup> <mrow> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>4</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mo>-</mo> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>
    <mrow> <msubsup> <mi>U</mi> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>&amp;prime;</mo> </msubsup> <mo>=</mo> <mrow> <mo>(</mo> <msubsup> <mi>I</mi> <mn>3</mn> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mi>I</mi> <mn>5</mn> <mo>&amp;prime;</mo> </msubsup> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>U</mi> <mrow> <mo>+</mo> <mi>A</mi> <mi>C</mi> </mrow> </msub> <mo>=</mo> <msubsup> <mi>U</mi> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>&amp;prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mi>U</mi> <mn>556</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>;</mo> </mrow>
    When circuit, which is in negative busbar exchange, scurries into detection, by the u measured "2It can obtain：
    <mrow> <msubsup> <mi>I</mi> <mn>5</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>=</mo> <mfrac> <msubsup> <mi>u</mi> <mn>2</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <msub> <mi>R</mi> <mn>5</mn> </msub> </mfrac> <mo>;</mo> </mrow>
    U″56=(R5+R6)×I″5；
    <mrow> <msubsup> <mi>I</mi> <mn>1</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>=</mo> <mfrac> <msubsup> <mi>U</mi> <mn>56</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mrow> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <msub> <mi>R</mi> <mo>+</mo> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>
    <mrow> <msubsup> <mi>U</mi> <msub> <mi>R</mi> <mn>3</mn> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>=</mo> <mrow> <mo>(</mo> <msubsup> <mi>I</mi> <mn>1</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>+</mo> <msubsup> <mi>I</mi> <mn>5</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <msub> <mi>R</mi> <mn>3</mn> </msub> <mo>;</mo> </mrow>
    <mrow> <msub> <mi>U</mi> <mrow> <mo>-</mo> <mi>A</mi> <mi>C</mi> </mrow> </msub> <mo>=</mo> <msubsup> <mi>U</mi> <msub> <mi>R</mi> <mn>3</mn> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>+</mo> <msubsup> <mi>U</mi> <mn>56</mn> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msubsup> <mo>;</mo> </mrow>
    The value U of alternating voltage is scurried into by the positive and negative bus calculated+AC、U-AC, judge that straight-flow system scurries into event with the presence or absence of exchange Barrier.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203673023U (en) * 2014-01-21 2014-06-25 国家电网公司 Terminal apparatus for detecting insulation condition of direct current system
CN104330681A (en) * 2013-07-22 2015-02-04 艾默生网络能源有限公司 Device for detecting AC entering DC bus in DC power system
WO2015087098A1 (en) * 2013-12-13 2015-06-18 Prause József Method for measuring the insulation resistance of an ungrounded dc power network and for localizing the earth fault, and current injecting two-pole device
CN204882720U (en) * 2015-08-14 2015-12-16 许继电源有限公司 Intelligent computer direct current system monitoring facilities

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104330681A (en) * 2013-07-22 2015-02-04 艾默生网络能源有限公司 Device for detecting AC entering DC bus in DC power system
WO2015087098A1 (en) * 2013-12-13 2015-06-18 Prause József Method for measuring the insulation resistance of an ungrounded dc power network and for localizing the earth fault, and current injecting two-pole device
CN203673023U (en) * 2014-01-21 2014-06-25 国家电网公司 Terminal apparatus for detecting insulation condition of direct current system
CN204882720U (en) * 2015-08-14 2015-12-16 许继电源有限公司 Intelligent computer direct current system monitoring facilities

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