CN104345215A - Insulation resistance detecting method, device, and apparatus - Google Patents

Abstract

The embodiment of the invention provides an insulation resistance detecting method, device, and apparatus used for solving a problem of inaccurate insulation resistance detection probably caused by the existence of silicon chains when a conventional insulation resistance detecting method is applied to a system containing silicon chains. The method comprises steps of: connecting a first resistor unit with a preset resistance value between a positive DC bus and a ground wire and connecting a second resistor unit with a preset resistance value between a negative DC bus and the ground wire after an insulation fault position of the DC bus is determined; determining current flowing through a third resistor and current flowing through a fourth resistor according to the insulation fault position of the DC bus; and determining the resistance value of the third resistor and the resistance value of the fourth resistor according to a fact that the sum of the current flowing through the first resistor unit, the current flowing through the second resistor unit, the current flowing through the third resistor, and the current flowing through the fourth resistor is zero.

Description

A kind of method that insulation resistance detects, device and equipment

Technical field

The present invention relates to electric and electronic technical field, particularly relate to method, device and equipment that a kind of insulation resistance detects.

Background technology

Electric system is a floating neutral system; positive direct-current bus and negative DC bus insulating property over the ground can reduce along with the aging of consumer or extraneous factor impact; decreasing insulating may cause the protective relaying device misoperation of straight-flow system outgoing side, and then causes Electrical Safety accident.Therefore insulation resistance detection device long term monitoring DC bus insulation status over the ground must be had in electric system.

The method generally adopted when detecting DC bus insulation resistance over the ground has balance bridge method and uneven bridge method, also referred to as voltage mode method and resistance mode method.Balance bridge method is only adding balance bridge on DC bus, by detecting positive direct-current bus voltage over the ground and negative DC bus voltage over the ground, give tacit consent to the DC bus generation decreasing insulating only having voltage over the ground lower, by status Bar equation, solve the resistance to earth of the lower DC bus of voltage over the ground.The method is simple, and detection speed is fast, but when decline all occurs for positive direct-current bus and negative DC bus insulating property over the ground, and balance bridge method cannot detect positive direct-current bus resistance over the ground and negative DC bus resistance over the ground respectively.Uneven bridge method needs on DC bus, add balance bridge and uneven bridge, DC bus is aligned and negative DC bus throws resistance respectively by uneven bridge, by two status Bars, two equations, solve the resistance to earth of positive direct-current bus and the resistance to earth of negative DC bus respectively.When positive direct-current bus and negative DC bus insulating property over the ground all occur to decline, the method can detect positive direct-current bus resistance over the ground and negative DC bus resistance over the ground respectively.

When being applied in the system without silicon chain, uneven bridge method can well measure positive direct-current bus resistance over the ground and negative DC bus resistance over the ground.But most of electric system all has silicon chain, DC bus be divide into closing bus bar and control bus by silicon chain, for the system comprising silicon chain, no matter be closing bus bar generation insulation fault or control bus generation insulation fault, the pressure drop of silicon chain is constant all the time, therefore the equivalence of silicon chain can be become a voltage source.The existence of voltage source can make the result of calculation of uneven bridge method can produce very large deviation, and this deviation is directly proportional to the voltage of voltage source.

When to when having the system of silicon chain to use uneven bridge method to measure the resistance to earth of positive direct-current bus resistance to earth and negative DC bus, as shown in Figure 1, positive direct-current bus be divide into positive closing bus bar HM+ and positive control bus KM+ by silicon chain, balance bridge (resistance R+ and resistance R-) is connected on closing bus bar, namely positive closing bus bar HM+ is connected on, between ground wire PE and negative closing bus bar HM-, if the difference of the voltage on positive closing bus bar HM+ and the voltage on ground wire PE is Up, the difference of the voltage on the voltage on ground wire PE and negative closing bus bar HM-is Un, the difference of the voltage on the voltage on positive closing bus bar HM+ and negative closing bus bar HM-is Uh, the difference of the voltage on the voltage on positive closing bus bar HM+ and negative closing bus bar HM-is Uh, voltage on positive control bus KM+ and negative control bus KM-(i.e. negative closing bus bar HM-) on the difference of voltage be Uc, voltage on silicon chain is Ud.When insulation fault appears in positive closing bus bar HM+, stake resistance is not shown in R1(Fig. 1), because the voltage source of silicon chain equivalence can not form loop with resistance R+ and stake resistance R1, therefore, the voltage source of silicon chain equivalence can not have an impact to Up and Un; And when insulation fault appears in positive control bus KM+, if stake resistance is R1, because the voltage source of silicon chain equivalence can form loop with resistance R+ and stake resistance R1, therefore, the voltage source of silicon chain equivalence can have an impact to Up and Un, and when calculating stake resistance, can use Up and Un, therefore, the existence of silicon chain can cause the calculating of insulation resistance to there is deviation.

In sum, when the method that existing insulation resistance detects is applied to the system comprising silicon chain, due to the existence of silicon chain, insulation resistance may be caused to detect inaccurate problem.

Summary of the invention

Embodiments provide method, device and equipment that a kind of insulation resistance detects, when the method detected is applied to the system comprising silicon chain, due to the existence of silicon chain, insulation resistance may be caused to detect inaccurate problem in order to solve existing insulation resistance.

Based on the problems referred to above, the method that a kind of insulation resistance that the embodiment of the present invention provides detects, comprising:

After the position determining DC bus generation insulation fault, between positive direct-current bus and ground wire, access the first resistance unit of preset resistive value, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value;

According to the position of DC bus generation insulation fault, determine flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; Described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

The device that a kind of insulation resistance that the embodiment of the present invention provides detects, comprising:

Module is set, for after the position determining DC bus generation insulation fault, between positive direct-current bus and ground wire, accesses the first resistance unit of preset resistive value, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value;

First determination module, for the position according to DC bus generation insulation fault, determines flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; Described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

Second determination module, for according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determines the resistance of the 3rd resistance and the resistance of the 4th resistance.

The equipment that a kind of insulation resistance that the embodiment of the present invention provides detects, comprise: insulation main frame and insulation are from machine, described insulation main frame connects positive direct-current bus, negative DC bus and ground wire respectively, and described insulation connects positive closing bus bar, negative closing bus bar, positive control bus and negative control bus respectively from machine;

Described insulation is from machine, for determining the position that insulation fault occurs in DC bus, and send announcement information to insulation main frame, for notifying that insulation main frame accesses the first resistance unit of preset resistive value between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value; And after the first indication information receiving the transmission of insulation main frame, according to the position that insulation fault occurs in DC bus, to insulation main frame, to send voltage in the first bus be the voltage of positive bus, and to send voltage in the first bus to insulation main frame be the voltage of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

Described insulation main frame, for after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus and ground wire between positive direct-current bus and ground wire; And send the first indication information to insulation from machine, being used to indicate insulation, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine be the voltage of negative bus; And be the voltage of positive bus according to voltage in the first bus received, determine that in the first bus, voltage is voltage difference between positive bus and ground wire, and be the electric current that between positive bus and ground wire, voltage difference determines to flow through the 3rd resistance according to voltage in the first bus; Be the voltage of negative bus according to voltage in the first bus received, determine that in the first bus, voltage is the voltage difference between negative bus and ground wire, and be the voltage difference between negative bus and ground wire according to voltage in the first bus, determine the electric current flowing through the 4th resistance; And according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance; Wherein, described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus.

The beneficial effect of the embodiment of the present invention comprises:

The method that the insulation resistance that the embodiment of the present invention provides detects, device and equipment, after the position determining DC bus generation insulation fault, the first resistance unit of preset resistive value is accessed between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value, and according to the position of DC bus generation insulation fault, determine flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance, that is, if the position that insulation fault occurs is positioned at closing bus bar, then determine according to the voltage difference of positive closing bus bar and ground wire the electric current flowing through the 3rd resistance, voltage difference according to negative closing bus bar and ground wire determines the electric current flowing through the 4th resistance, if the position that insulation fault occurs is positioned at control bus, then determine according to the voltage difference of positive control bus and ground wire the electric current flowing through the 3rd resistance, voltage difference according to negative control bus and ground wire determines the electric current flowing through the 4th resistance, then, again according to the electric current flowing through the first resistance unit, flow through the electric current of the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum flowing through the 4th resistance are zero, determine the 3rd resistance, namely in the first bus, voltage is resistance and the 4th resistance of the insulation against ground resistance of positive bus, namely in the first bus, voltage is the resistance of the insulation against ground resistance of negative bus.Due to the method for the insulation resistance detection that the embodiment of the present invention provides, first the position that insulation fault occurs is determined in DC bus, for diverse location generation insulation fault, determine flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance according to different voltage, therefore, the impact of silicon chain on the voltage on DC bus takes into account by the detection method of the insulation resistance that the embodiment of the present invention provides, when overcoming existing uneven method measurement insulation resistance, owing to the impact of silicon chain on the voltage on DC bus can not be taken into account, the inaccurate problem of detection of the insulation resistance caused.

Accompanying drawing explanation

Fig. 1 is the structural representation of the system comprising silicon chain in prior art;

The process flow diagram of one of the method that the insulation resistance that Fig. 2 provides for the embodiment of the present invention detects;

The process flow diagram of the method two that the insulation resistance that Fig. 3 provides for the embodiment of the present invention detects;

The process flow diagram of the method three that the insulation resistance that Fig. 4 provides for the embodiment of the present invention detects;

The process flow diagram of the method four that the insulation resistance that Fig. 5 provides for the embodiment of the present invention detects;

The structural representation of the device that the insulation resistance that Fig. 6 provides for the embodiment of the present invention detects;

The structural representation of one of the equipment that the insulation resistance that Fig. 7 a provides for the embodiment of the present invention detects;

The structural representation of the equipment two that the insulation resistance that Fig. 7 b provides for the embodiment of the present invention detects;

The structural representation of the equipment three that the insulation resistance that Fig. 8 a provides for the embodiment of the present invention detects;

The structural representation of the equipment four that the insulation resistance that Fig. 8 b provides for the embodiment of the present invention detects.

Embodiment

Existing uneven bridge method is when detecting the insulation against ground resistance of DC bus, first the position that insulation fault occurs in DC bus can not be determined, but for there being the system of silicon chain, DC bus be divide into closing bus bar and control bus by silicon chain, because silicon chain equivalence can become a voltage source, this will cause the voltage difference of closing bus bar and ground wire to be not equal to the voltage difference of control bus and ground wire.And after determining that insulation fault appears in DC bus, if determine the electric current of the insulation against ground resistance flowing through positive direct-current bus according to the voltage difference of positive closing bus bar and ground wire, the electric current of the insulation against ground resistance flowing through negative DC bus is determined according to the voltage difference of negative closing bus bar and ground wire, but if the control bus generation insulation fault in DC bus, that is, the insulation against ground resistance of positive direct-current bus is connected between positive control bus and ground wire, the insulation against ground resistance of negative DC bus is connected between negative control bus and ground wire, so owing to there is silicon chain between closing bus bar and control bus, the voltage causing the voltage of closing bus bar and control bus is not etc., therefore the electric current of the insulation against ground resistance flowing through positive direct-current bus is determined according to the voltage difference of positive closing bus bar and ground wire, the electric current of the insulation against ground resistance flowing through negative DC bus is determined according to the voltage difference of negative closing bus bar and ground wire, obviously inaccurate.Similarly, after determining that insulation fault appears in DC bus, if determine the electric current of the insulation against ground resistance flowing through positive direct-current bus according to the voltage difference of positive control bus and ground wire, the electric current of the insulation against ground resistance flowing through negative DC bus is determined according to the voltage difference of negative control bus and ground wire, but if the closing bus bar generation insulation fault in DC bus, that is, the insulation against ground resistance of positive direct-current bus is connected between positive closing bus bar and ground wire, the insulation against ground resistance of negative DC bus is connected between negative closing bus bar and ground wire, so owing to there is silicon chain between closing bus bar and control bus, the voltage causing the voltage of closing bus bar and control bus is not etc., therefore the electric current of the insulation against ground resistance flowing through positive direct-current bus is determined according to the voltage difference of positive control bus and ground wire, the electric current of the insulation against ground resistance flowing through negative DC bus is determined according to the voltage difference of negative control bus and ground wire, obviously inaccurate.This will cause the resistance of the resistance of the insulation against ground resistance of the positive direct-current bus determined and the insulation against ground resistance of negative DC bus inaccurate.

Therefore, embodiments provide a kind of method that insulation resistance detects, device and equipment, will according to the position that insulation fault occurs in DC bus, determine flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance, that is, if the position that insulation fault occurs is positioned at closing bus bar, namely the 3rd resistance is connected between positive closing bus bar and ground wire, 4th resistance is connected between negative closing bus bar and ground wire, then determine according to the voltage difference of positive closing bus bar and ground wire the electric current flowing through the 3rd resistance, voltage difference according to negative closing bus bar and ground wire determines the electric current flowing through the 4th resistance, if the position that insulation fault occurs is positioned at control bus, namely the 3rd resistance is connected between positive control bus and ground wire, 4th resistance is connected between negative control bus and ground wire, then determine according to the voltage difference of positive control bus and ground wire the electric current flowing through the 3rd resistance, voltage difference according to negative control bus and ground wire determines the electric current flowing through the 4th resistance, the electric current flowing through the 3rd resistance and the electric current flowing through the 4th resistance can be determined exactly, therefore, avoid the impact of silicon chain, the insulation against ground resistance of the system comprising silicon chain can be determined exactly.

Below in conjunction with Figure of description, the embodiment of method, device and equipment that a kind of insulation resistance provided the embodiment of the present invention detects is described.

The method that a kind of insulation resistance that the embodiment of the present invention provides detects, as shown in Figure 2, specifically comprises the following steps:

S201, determine the position of DC bus generation insulation fault;

S202, between positive direct-current bus and ground wire, access the first resistance unit of preset resistive value, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value;

S203, position according to DC bus generation insulation fault, determine flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; Wherein, the 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and the 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then the first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then the first bus is control bus;

S204, according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

When the position that insulation fault occurs is positioned at closing bus bar, 3rd resistance is the insulation against ground resistance of positive closing bus bar, namely the 3rd resistance is connected between positive closing bus bar and ground wire, 4th resistance is the insulation against ground resistance of negative closing bus bar, and namely the 4th resistance is connected between negative closing bus bar and ground wire; When the position that insulation fault occurs is positioned at control bus, 3rd resistance is the insulation against ground resistance of positive control bus, namely the 3rd resistance is connected between positive control bus and ground wire, 4th resistance is the insulation against ground resistance of negative control bus, and namely the 4th resistance is connected between negative control bus and ground wire; The resistance of the 3rd resistance and the resistance of the 4th resistance to be determined.

In addition, after the position determining DC bus generation insulation fault, before the electric current determining to flow through the 3rd resistance and the electric current flowing through the 4th resistance, first resistance unit is set between positive direct-current bus and ground wire, and the second resistance unit is set between negative DC bus and ground wire, the resistance of the first resistance unit and the resistance of the second resistance unit are known, and the voltage at the two ends of the first resistance unit and the second resistance unit is known.

Further, in S202, when silicon chain is positioned on positive direct-current bus, the first resistance unit can be arranged between positive closing bus bar and ground wire, also can be arranged between positive control bus and ground wire; Due to negative DC bus not having silicon chain, therefore, bear closing bus bar, negative control bus is identical with negative DC bus three.When silicon chain is positioned on negative DC bus, the second resistance unit can be arranged between negative closing bus bar and ground wire, also can be arranged between negative control bus and ground wire; Due to positive direct-current bus not having silicon chain, therefore, positive closing bus bar, positive control bus are identical with positive direct-current bus three.

Further, as shown in Figure 3, S203 specifically comprises:

If the position that insulation fault occurs S203a is positioned at closing bus bar, then determines according to the voltage difference between positive closing bus bar and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative closing bus bar and ground wire the electric current flowing through the 4th resistance;

If the position that insulation fault occurs S203b is positioned at control bus, then determines according to the voltage difference between positive control bus and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative control bus and ground wire the electric current flowing through the 4th resistance.

Further, as shown in Figure 4, S204 specifically comprises:

S204a1, according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

S204b1, adjust the resistance of the first resistance unit;

S204c1, determine to flow through the electric current of the first resistance unit after resistance adjustment, and the electric current flowing through the second resistance unit after determining the resistance of adjustment first resistance unit, adjust the first resistance unit resistance after flow through the electric current of the 3rd resistance and the resistance of adjustment the first resistance unit after flow through the electric current of the 4th resistance;

Wherein, S204c1 specifically comprises S204c11 and S204c12 two kinds of situations;

S204c11, when there is the position of insulation fault and being positioned at closing bus bar, the electric current flowing through the 3rd resistance is determined according to the voltage difference between the positive closing bus bar after the resistance of adjustment first resistance unit and ground wire, determine according to the voltage difference between the negative closing bus bar after the resistance of adjustment first resistance unit and ground wire the electric current flowing through the 4th resistance, after determining the electric current of the first resistance unit flow through after resistance adjustment and the resistance of adjustment the first resistance unit, flow through the electric current of the second resistance unit;

S204c12, when there is the position of insulation fault and being positioned at control bus, the electric current flowing through the 3rd resistance is determined according to the voltage difference between the positive control bus after the resistance of adjustment first resistance unit and ground wire, determine according to the voltage difference between the negative control bus after the resistance of adjustment first resistance unit and ground wire the electric current flowing through the 4th resistance, after determining the electric current of the first resistance unit flow through after resistance adjustment and the resistance of adjustment the first resistance unit, flow through the electric current of the second resistance unit;

Flow through the electric current of the 4th resistance after the electric current flowing through the 3rd resistance after S204d1, resistance according to adjustment first resistance unit determined, the resistance adjusting the first resistance unit, flow through resistance adjustment after the electric current of the first resistance unit and the resistance of adjustment the first resistance unit after flow through the second resistance unit electric current sum be zero, determine the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

S204e1, according to the first relational expression and the second relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

That is, after access first resistance unit and the second resistance unit, determine the electric current flowing through the 3rd resistance, flow through the electric current of the 4th resistance, flow through the electric current of the first resistance unit and flow through the electric current of the second resistance unit, then according to the electric current flowing through the 3rd resistance, flow through the electric current of the 4th resistance, the electric current flowing through the first resistance unit and the electric current sum flowing through the second resistance unit are zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance, then the resistance of the first resistance unit is changed, in actual applications, can by the string of resistance in change first resistance unit, parallel relationship, or the resistance do not accessed between positive direct-current bus and ground wire in the first resistance unit is linked between positive direct-current bus and ground wire, thus change the resistance of the first resistance unit, after resistance change due to the first resistance unit, just, negative voltage difference between closing bus bar and ground wire can change, just, voltage difference between negative control bus and ground wire can change, therefore, after the resistance of adjustment first resistance unit, again determine the electric current flowing through the 3rd resistance, flow through the electric current of the 4th resistance, flow through the electric current of the first resistance unit after resistance adjustment and flow through the electric current of the second resistance unit, now, flow through the electric current of the 3rd resistance, flow through the electric current of the 4th resistance, the electric current flowing through the first resistance unit after adjustment and the electric current sum flowing through the second resistance unit are still zero, therefore, the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance can be determined, then the resistance of the 3rd resistance and the resistance of the 4th resistance is determined according to the first relational expression and the second relational expression.

Or as shown in Figure 5, S204 specifically comprises:

S204a2, according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

S204b2, adjust the resistance of the second resistance unit;

S204c2, determine to flow through the electric current of the second resistance unit after resistance adjustment, and the electric current flowing through the first resistance unit after determining the resistance of adjustment second resistance unit, adjust the second resistance unit resistance after flow through the 3rd resistance electric current, adjust the second resistance unit resistance after flow through the electric current of the 4th resistance;

Wherein, S204c2 specifically comprises S204c21 and S204c22 two kinds of situations;

S204c21, when there is the position of insulation fault and being positioned at closing bus bar, the electric current flowing through the 3rd resistance is determined according to the voltage difference between the positive closing bus bar after the resistance of adjustment second resistance unit and ground wire, determine according to the voltage difference between the negative closing bus bar after the resistance of adjustment second resistance unit and ground wire the electric current flowing through the 4th resistance, flow through the electric current of the first resistance unit after determining the resistance of adjustment second resistance unit and flow through the electric current of the second resistance unit after resistance adjustment;

S204c22, when there is the position of insulation fault and being positioned at control bus, the electric current flowing through the 3rd resistance is determined according to the voltage difference between the positive control bus after the resistance of adjustment second resistance unit and ground wire, determine according to the voltage difference between the negative control bus after the resistance of adjustment second resistance unit and ground wire the electric current flowing through the 4th resistance, flow through the electric current of the first resistance unit after determining the resistance of adjustment second resistance unit and flow through the electric current of the second resistance unit after resistance adjustment;

S204d2, according to determine flow through resistance adjustment after the second resistance unit electric current, adjust the second resistance unit resistance after flow through the first resistance unit electric current, adjust the second resistance unit resistance after flow through the electric current of the 3rd resistance and the resistance of adjustment the second resistance unit after flow through the electric current of the 4th resistance, determine the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

S204e2, according to the first relational expression and the 3rd relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

That is, after the first resistance unit and the second resistance unit are set, determine the electric current flowing through the 3rd resistance, flow through the electric current of the 4th resistance, flow through the electric current of the first resistance unit and flow through the electric current of the second resistance unit, then according to the electric current flowing through the 3rd resistance, flow through the electric current of the 4th resistance, the electric current flowing through the first resistance unit and the electric current sum flowing through the second resistance unit are zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance, then the resistance of the second resistance unit is changed, in actual applications, can by the string of resistance in change second resistance unit, parallel relationship, or the resistance do not accessed between negative DC bus and ground wire in the second resistance unit is linked between positive direct-current bus and ground wire, thus change the resistance of the second resistance unit, after resistance change due to the second resistance unit, just, negative voltage difference between closing bus bar and ground wire can change, just, voltage difference between negative control bus and ground wire can change, therefore, after the resistance of adjustment second resistance unit, again determine the electric current flowing through the 3rd resistance, flow through the electric current of the 4th resistance, flow through the electric current of the electric current of the first resistance unit and the second resistance unit after flowing through adjustment, now, flow through the electric current of the 3rd resistance, flow through the electric current of the 4th resistance, the electric current sum flowing through the electric current of the first resistance unit and the second resistance unit after flowing through adjustment is still zero, therefore, the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance can be determined, then, the resistance of the 3rd resistance and the resistance of the 4th resistance is determined according to the first relational expression and the 3rd relational expression.

Based on same inventive concept, the embodiment of the present invention additionally provides device and the equipment of the detection of a kind of insulation resistance, the principle of dealing with problems due to these devices and equipment is similar to the method for aforementioned dielectric resistance detection, therefore the enforcement of this device and equipment see the enforcement of preceding method, can repeat part and repeats no more.

The device that the insulation resistance that the embodiment of the present invention provides detects, as shown in Figure 6, comprising:

Module 61 is set, for after the position determining DC bus generation insulation fault, between positive direct-current bus and ground wire, accesses the first resistance unit of preset resistive value, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value;

First determination module 62, for the position according to DC bus generation insulation fault, determines flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; Described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

Second determination module 63, for according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determines the resistance of the 3rd resistance and the resistance of the 4th resistance.

Further, first determination module 62 specifically for: if there is the position of insulation fault to be positioned at closing bus bar, then determine according to the voltage difference between positive closing bus bar and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative closing bus bar and ground wire the electric current flowing through the 4th resistance; If the position that insulation fault occurs is positioned at control bus, then determines according to the voltage difference between positive control bus and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative control bus and ground wire the electric current flowing through the 4th resistance.

Further, second determination module 63 specifically for: according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance; Adjust the resistance of the first resistance unit; And determine to flow through the electric current of the first resistance unit after resistance adjustment, and flow through after the resistance determining adjustment first resistance unit the second resistance unit electric current, flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; According to determine flow through resistance adjustment after the first resistance unit electric current, adjust the first resistance unit resistance after flow through the electric current of the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance; According to described first relational expression and described second relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

Or, second determination module 63 specifically for: according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance; Adjust the resistance of the second resistance unit; And determine to flow through the electric current of the second resistance unit after resistance adjustment, and flow through after the resistance determining adjustment second resistance unit the first resistance unit electric current, flow through the electric current of the 3rd resistance, flow through the electric current of the 4th resistance; According to the electric current flowing through the second resistance unit after resistance adjustment determined, flowing through the electric current of the first resistance unit after adjusting the resistance of the second resistance unit, flow through the electric current of the 3rd resistance, flowing through the electric current sum of the 4th resistance is zero, determines the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance; According to described first relational expression and described 3rd relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

The method that the insulation resistance provided according to the embodiment of the present invention detects detects the thought of insulation resistance, embodiments provide the equipment that a kind of insulation resistance detects, an embodiment of the method that this equipment insulation resistance that only just the embodiment of the present invention provides detects.

The equipment that the insulation resistance that the embodiment of the present invention provides detects, as shown in figs. 7 a and 7b, comprising:

Insulation main frame 71 and insulation are from machine 72, and insulation main frame 71 connects positive direct-current bus DC+, negative DC bus DC-and ground wire respectively, insulate from machine 72 and connect positive closing bus bar HM+, negative closing bus bar HM-, positive control bus KM+ and negative control bus KM-respectively;

Insulation is from machine 72, for determining the position that insulation fault occurs in DC bus, and send announcement information to insulation main frame 71, for notifying that insulation main frame 71 accesses the first resistance unit of preset resistive value between positive direct-current bus DC+ and ground wire, and between negative DC bus DC-and ground wire, access the second resistance unit of preset resistive value; And after the first indication information receiving the transmission of insulation main frame 71, according to the position that insulation fault occurs in DC bus, to insulation main frame 71, to send voltage in the first bus be the voltage of positive bus, and to send voltage in the first bus to insulation main frame 71 be the voltage of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

Insulation main frame 71, for after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus DC-and ground wire between positive direct-current bus DC+ and ground wire; And send the first indication information to insulation from machine 72, being used to indicate insulation, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine 72 be the voltage of negative bus; And be the voltage of positive bus according to voltage in the first bus received, determine that in the first bus, voltage is voltage difference between positive bus and ground wire, and be the electric current that between positive bus and ground wire, voltage difference determines to flow through the 3rd resistance according to voltage in the first bus; Be the voltage of negative bus according to voltage in the first bus received, determine that in the first bus, voltage is the voltage difference between negative bus and ground wire, and be the voltage difference between negative bus and ground wire according to voltage in the first bus, determine the electric current flowing through the 4th resistance; And according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance; Wherein, the 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and the 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus.

Wherein, the 3rd resistance and the 4th resistance not shown in Fig. 7 a and Fig. 7 b.

As shown in figs. 7 a and 7b, first resistance unit and the second resistance unit can be included in insulation main frame 71, controlled the first resistance unit whether be linked between positive direct-current bus DC+ and ground wire by insulation main frame 71, and control the second resistance unit and whether be linked between negative DC bus DC-and ground wire.When insulation does not detect DC bus generation earth fault from machine 72, the first resistance unit can not be linked between positive direct-current bus DC+ and ground wire by insulation main frame 91, also the second resistance unit can not be linked between negative DC bus DC-and ground wire; And after insulation detects DC bus generation earth fault from machine 72, the first resistance unit just can be linked between positive direct-current bus DC+ and ground wire by insulation main frame 71, and the second resistance unit is linked between negative DC bus DC-and ground wire.

The main frame that insulate in figure 7 a connects positive closing bus bar HM+, negative closing bus bar HM-and ground wire, and the main frame that insulate in fig .7b connects positive control bus KM+, negative control bus KM-and ground wire.

Further, as figures 8 a and 8 b show, insulate from machine 72 and comprise the first insulation from machine 721 and the second insulation from machine 722; First insulation connects positive closing bus bar HM+, negative closing bus bar HM-from machine 721; Second insulation connects positive control bus KM+, negative control bus KM-from machine 722;

First insulation is from machine 721, for when closing bus bar generation insulation fault being detected, announcement information is sent to insulation main frame 71, for notifying that insulation main frame 71 accesses the first resistance unit between positive direct-current bus DC+ and ground wire, and access the second resistance unit between negative DC bus DC-and ground wire; And after receiving the first indication information, send the voltage of positive closing bus bar HM+ and the voltage of negative closing bus bar HM-to insulation main frame 71;

Second insulation is from machine 722, for when control bus generation insulation fault being detected, announcement information is sent to insulation main frame 71, for notifying that insulation main frame 71 accesses the first resistance unit between positive direct-current bus DC+ and ground wire, and access the second resistance unit between negative DC bus DC-and ground wire; And after receiving the first indication information, send the voltage of positive control bus KM+ and the voltage of negative control bus KM-to insulation main frame 71;

Insulation main frame 71, specifically for after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus DC-and ground wire between positive direct-current bus DC+ and ground wire; And send the first indication information to sending the insulation of announcement information from machine, being used to indicate the insulation sending announcement information, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine be the voltage of negative bus; And be the voltage of positive bus according to voltage in the first bus received, determine that in the first bus, voltage is voltage difference between positive bus and ground wire, and be the electric current that between positive bus and ground wire, voltage difference determines to flow through the 3rd resistance according to voltage in the first bus; Be the voltage of negative bus according to voltage in the first bus received, determine that in the first bus, voltage is the voltage difference between negative bus and ground wire, and be the voltage difference between negative bus and ground wire according to voltage in the first bus, determine the electric current flowing through the 4th resistance; And according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance; Wherein, described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus.

When the first insulation measures closing bus bar generation insulation fault from machine examination, announcement information is sent to insulation main frame, insulation main frame, after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus and ground wire between positive direct-current bus and ground wire; And send the first indication information to the insulation sending announcement information from machine, namely send the first indication information to the first insulation from machine, be used to indicate the first insulation and send the voltage of positive closing bus bar and the voltage of negative closing bus bar from machine.When the second insulation measures control bus generation insulation fault from machine examination, announcement information is sent to insulation main frame, insulation main frame, after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus and ground wire between positive direct-current bus and ground wire; And send the first indication information to the insulation sending announcement information from machine, namely send the first indication information to the second insulation from machine, be used to indicate the second insulation and send the voltage of positive control bus and the voltage of negative control bus from machine.

The main frame 71 that insulate in Fig. 8 a connects positive closing bus bar HM+, negative closing bus bar HM-and ground wire, and the main frame 71 that insulate in figure 8b connects positive control bus KM+, negative control bus KM-and ground wire.

Wherein the first resistance unit can comprise two resistance, when the first resistance unit is linked between positive direct-current bus and ground wire by needs, one of them resistance is linked between positive direct-current bus and ground wire, when needing the resistance of change first resistance unit, can another resistance be also linked between positive direct-current bus and ground wire, wherein, two resistance can all be connected between positive closing bus bar and ground wire, also can all be connected between positive control bus and ground wire, can also be connected between positive closing bus bar and ground wire by a resistance, another resistance is connected between positive control bus and ground wire.In Fig. 8 a, when needing the resistance of change first resistance unit, be all connected between positive closing bus bar and ground wire for the resistance R11 and resistance R12 of two in the first resistance unit.In figure 8b, when needing the resistance of change first resistance unit, be all connected between positive control bus and ground wire for the resistance R11 and resistance R12 of two in the first resistance unit.

Wherein the second resistance unit can comprise two resistance, when the second resistance unit is linked between negative DC bus and ground wire by needs, one of them resistance is linked between negative DC bus and ground wire, when needing the resistance of change first resistance unit, can another resistance be also linked between negative DC bus and ground wire, wherein, two resistance can all be connected between negative closing bus bar and ground wire, also can all be connected between negative control bus and ground wire, can also be connected between negative closing bus bar and ground wire by a resistance, another resistance is connected between negative control bus and ground wire.In Fig. 8 a, when needing the resistance of change second resistance unit, be all connected between negative closing bus bar and ground wire for the resistance R21 and resistance R22 of two in the second resistance unit.In figure 8b, when needing the resistance of change second resistance unit, be all connected between negative control bus and ground wire for the resistance R21 and resistance R22 of two in the second resistance unit.

Further, as figures 8 a and 8 b show, insulation main frame 71 comprises controlled processing unit 711, first resistance unit and the second resistance unit, and 711 controlled processing units connect the first insulation and insulate from machine 722, first resistance unit, the second resistance unit, positive direct-current bus DC+, negative DC bus DC-and ground wire from machine 721, second; Wherein, first resistance unit comprises resistance R11 and resistance R12, therefore, controlled processing unit 711 connects the first resistance unit, namely contact resistance R11 and resistance R12, the second resistance unit comprises resistance R21 and resistance R22, therefore, controlled processing unit 711 connects the second resistance unit, namely contact resistance R21 and resistance R22; In Fig. 8 a, controlled processing unit 711 connects positive direct-current bus, namely connects positive closing bus bar HM+, connects negative DC bus DC-, namely connects negative closing bus bar HM-; In figure 8b, controlled processing unit 711 connects positive direct-current bus, namely connects positive control bus KM+, connects negative DC bus DC-, namely connects negative control bus KM-.

Controlled processing unit 711, for after receiving announcement information, controls the first resistance unit and is linked between positive direct-current bus DC+ and ground wire, and controls the second resistance unit and be linked between negative DC bus DC-and ground wire; And send the first indication information to sending the insulation of announcement information from machine, being used to indicate the insulation sending announcement information, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine be the voltage of negative bus; And be the voltage of positive bus according to voltage in the first bus received, determine that in the first bus, voltage is voltage difference between positive bus and ground wire, and be the electric current that between positive bus and ground wire, voltage difference determines to flow through the 3rd resistance according to voltage in the first bus; Be the voltage of negative bus according to voltage in the first bus received, determine that in the first bus, voltage is the voltage difference between negative bus and ground wire, and be the voltage difference between negative bus and ground wire according to voltage in the first bus, determine the electric current flowing through the 4th resistance; And according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance;

First insulation is from machine 721, for when closing bus bar generation insulation fault being detected, announcement information is sent to controlled processing unit 711, for notifying that controlled processing unit 711 accesses the first resistance unit between positive direct-current bus DC+ and ground wire, and access the second resistance unit between negative DC bus DC-and ground wire; And after receiving the first indication information, send the voltage of positive closing bus bar KM+ and the voltage of negative closing bus bar KM-to controlled processing unit 711;

Second insulation is from machine 722, for when control bus generation insulation fault being detected, announcement information is sent to controlled processing unit 711, for notifying that controlled processing unit 711 accesses the first resistance unit between positive direct-current bus DC+ and ground wire, and access the second resistance unit between negative DC bus DC-and ground wire; And after receiving the first indication information, send the voltage of positive control bus KM+ and the voltage of negative control bus KM-to controlled processing unit 711.

Further, as shown in Fig. 7 a, Fig. 7 b, Fig. 8 a and Fig. 8 b, controlled processing unit 711 specifically for: if receive the voltage of positive closing bus bar HM+ and the voltage of negative closing bus bar HM-, then determine according to the voltage difference between positive closing bus bar HM+ and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative closing bus bar HM-and ground wire the electric current flowing through the 4th resistance; If receive the voltage of positive control bus KM+ and the voltage of negative control bus KM-, then determine according to the voltage difference between positive control bus KM+ and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative control bus KM-and ground wire the electric current flowing through the 4th resistance.

Further, as figures 8 a and 8 b show, controlled processing unit 711 specifically for: according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the first resistance unit; Resistance resistance R11 and the resistance R12 method simultaneously accessed between positive direct-current bus and ground wire being adjusted the first resistance unit can be adopted;

Send the second indication information to sending the insulation of announcement information from machine, the insulation being used to indicate described transmission announcement information voltage from the first bus after machine sends the resistance of adjustment first resistance unit is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus;

Be the voltage of positive bus according to voltage in the first bus after the resistance of adjustment first resistance unit received, determine that in the first bus after the resistance of adjustment first resistance unit, voltage is voltage difference between positive bus and ground wire, and be voltage difference between positive bus and ground wire according to voltage in the first bus after the resistance of adjustment first resistance unit, flow through the electric current of the 3rd resistance after determining the resistance of adjustment first resistance unit; And be the voltage of negative bus according to voltage in the first bus after the resistance of adjustment first resistance unit received, determine that in the first bus after the resistance of adjustment first resistance unit, voltage is voltage difference between negative bus and ground wire, and be voltage difference between negative bus and ground wire according to voltage in the first bus after the resistance of adjustment first resistance unit, flow through the electric current of the 4th resistance after determining the resistance of adjustment first resistance unit; And determine the electric current of the first resistance unit flow through after resistance adjustment; And after the resistance determining adjustment first resistance unit, flow through the electric current of the second resistance unit;

Flow through the electric current of the second resistance unit, the electric current flowing through the 3rd resistance after resistance according to the electric current flowing through the first resistance unit after resistance adjustment determined and adjustment the first resistance unit and the electric current sum that flows through the 4th resistance is zero, determine the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to the first relational expression and the second relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance;

Send announcement information insulation from machine also for, after receiving the second indication information, in the first bus after controlled processing unit sends the resistance of adjustment first resistance unit, voltage is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus.

Send announcement information insulation from machine also for, after receiving the second indication information, in the first bus after controlled processing unit 711 sends the resistance of adjustment first resistance unit, voltage is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus.

Or, as figures 8 a and 8 b show, controlled processing unit 711 specifically for: according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the second resistance unit; Resistance resistance R21 and the resistance R22 method simultaneously accessed between negative DC bus and ground wire being adjusted the second resistance unit can be adopted;

Send the 3rd indication information to the insulation sending announcement information from machine, the insulation being used to indicate described transmission announcement information voltage from the first bus after machine sends the resistance of adjustment second resistance unit is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus;

Be the voltage of positive bus according to voltage in the first bus after the resistance of adjustment second resistance unit received, determine that in the first bus after the resistance of adjustment second resistance unit, voltage is voltage difference between positive bus and ground wire, and be voltage difference between positive bus and ground wire according to voltage in the first bus after the resistance of adjustment second resistance unit, flow through the electric current of the 3rd resistance after determining the resistance of adjustment second resistance unit; And be the voltage of negative bus according to voltage in the first bus after the resistance of adjustment second resistance unit received, determine that in the first bus after the resistance of adjustment second resistance unit, voltage is voltage difference between negative bus and ground wire, and be voltage difference between negative bus and ground wire according to voltage in the first bus after the resistance of adjustment second resistance unit, flow through the electric current of the 4th resistance after determining the resistance of adjustment second resistance unit; And after determining the resistance of adjustment second resistance unit, flow through the electric current of the first resistance; And determine the electric current of the second resistance unit after flowing through resistance adjustment;

According to the electric current flowing through the second resistance unit after resistance adjustment determined, with flow through the electric current of the first resistance unit after the resistance of adjustment second resistance unit, the electric current flowing through the 3rd resistance, the electric current sum that flows through the 4th resistance be zero, determines the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to the first relational expression and the 3rd relational expression, determine the resistance of the first resistance and the resistance of the second resistance;

The insulation of described transmission announcement information from machine also for, after receiving the 3rd indication information, in the first bus that insulation main frame sends after the resistance of adjustment second resistance unit, voltage is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus.

Whether the first insulation there is insulation fault from machine testing closing bus bar, when closing bus bar generation insulation fault being detected, first insulation sends announcement information from machine, therefore, when closing bus bar generation insulation fault being detected, send announcement information insulation from machine be the first insulation from machine, first insulation from machine can adopt DC leakage flow sensor detect closing bus bar whether there is insulation fault.Whether the second insulation there is insulation fault from machine testing control bus, when control bus generation insulation fault being detected, second insulation sends announcement information from machine, therefore, when control bus generation insulation fault being detected, send announcement information insulation from machine be the second insulation from machine, second insulation DC leakage flow sensor detection control bus can be adopted whether insulation fault to occur from machine.

First indication information and the second indication information can be identical indication information, voltage in the first current bus, from after machine receives indication information at every turn, is just that in the voltage of positive bus and the first current bus, voltage is that the voltage of negative bus sends to controlled processing unit by the insulation sending announcement information.First indication information and the 3rd indication information can be identical indication information, voltage in the first current bus, from after machine receives indication information at every turn, is just that in the voltage of positive bus and the first current bus, voltage is that the voltage of negative bus sends to controlled processing unit by the insulation sending announcement information.

The equipment detected for the insulation resistance shown in Fig. 8 a and Fig. 8 b below illustrates the method flow process in actual applications that the insulation resistance that the embodiment of the present invention provides detects.

As figures 8 a and 8 b show, positive direct-current bus DC+ comprises silicon chain, and positive direct-current bus DC+ is divided into positive closing bus bar HM+ and positive control bus KM+ by silicon chain, and negative DC bus DC-does not comprise silicon chain, therefore, negative DC bus DC-, negative closing bus bar HM-are identical with negative control bus KM-three.The main frame 71 that insulate in Fig. 8 a connects positive closing bus bar HM+, negative closing bus bar HM-and ground wire, and the main frame 71 that insulate in figure 8b connects positive control bus KM+, negative control bus KM-and ground wire.

If the equipment that insulation resistance detects adopts the connected mode of Fig. 8 a, when the second insulation detects control bus generation insulation fault from machine 722, controlled processing unit 711 in notice insulation main frame 71 accesses the first resistance unit between positive closing bus bar HM+ and ground wire, namely resistance R11 is accessed, the second resistance unit is accessed between negative closing bus bar HM-and ground wire, namely resistance R21 is accessed, then, the electric current flowing through the 3rd resistance R3 is determined, namely according to the voltage difference U kp1 between positive control bus KM+ and ground wire the electric current flowing through the 4th resistance R4 is determined, namely according to the voltage difference U kn1 between negative control bus KM-and ground wire the electric current flowing through the first resistance unit is the voltage difference U hp1 between positive closing bus bar HM+ and ground wire and the ratio of the resistance of the first resistance unit, namely the electric current flowing through the second resistance unit is the voltage difference U hn1 between negative closing bus bar HM-and ground wire and the ratio of the resistance of the second resistance unit, namely owing to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance R3 and the electric current sum that flows through the 4th resistance R4 is 0, that is, the first relational expression is as follows: $\frac{\mathrm{Ukp}1}{R3}+\frac{\mathrm{Ukn}1}{R4}+\frac{\mathrm{Uhp}1}{R11}+\frac{\mathrm{Uhn}1}{R21}=0$ Formula 1

Wherein Ukp1, Ukn1, Uhp1, Uhn1, to be all known be for R11, R21.Then, change the resistance of the first resistance unit by throwing resistance R12, namely change the resistance value between positive direct-current bus DC+ and ground wire by throwing resistance R12, resistance R12 is connected between positive closing bus bar HM+ and ground wire.After throwing resistance R12, voltage difference between positive closing bus bar HM+ and ground wire becomes Uhp2, negative voltage difference between closing bus bar HM-and ground wire becomes Uhn2, voltage difference between positive control bus KM+ and ground wire becomes Ukp2, voltage difference between negative control bus KM-and ground wire becomes Ukn2, therefore, after throwing resistance R12, the electric current flowing through the 3rd resistance R3 is the electric current flowing through the 4th resistance R4 is the electric current flowing through the first resistance unit after resistance adjustment is the electric current flowing through the second resistance unit is because the electric current of the first resistance unit after flowing through resistance adjustment, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance R3 and the electric current sum that flows through the 4th resistance R4 are 0, that is, the second relational expression is as follows: $\frac{\mathrm{Ukp}2}{R3}+\frac{\mathrm{Ukn}2}{R4}+\frac{\mathrm{Uhp}2}{R11}+\frac{\mathrm{Uhn}2}{R12}+\frac{\mathrm{Uhn}1}{R21}=0$ Formula 2

Wherein, Ukp2, Ukn2, Uhp2, Uhn2, R3, R4, R5 are known.Therefore, the resistance of the first resistance R1 and the resistance of the second resistance R2 can be determined according to formula 1 and formula 2.

After determining the first relational expression according to formula 1, when the resistance adopting the mode of throwing resistance R22 to change the second resistance unit, thus when determining that the 3rd relation makes, the formula similar with formula 2 can be listed, do not repeat them here.

When first insulation measure closing bus bar generation insulation fault from machine examination time, determine the method for the resistance of the 3rd resistance and the resistance of the 4th resistance and said method similar, do not repeat them here.

If the equipment that insulation resistance detects adopts the connected mode of Fig. 8 b, when the first insulation measures closing bus bar generation insulation fault from machine examination, determine the method for the resistance of the 3rd resistance and the resistance of the 4th resistance and said method similar, do not repeat them here.When second insulation measure control bus generation insulation fault from machine examination time, determine the method for the resistance of the 3rd resistance and the resistance of the 4th resistance and said method similar, do not repeat them here.

In addition, when the first insulation measures closing bus bar generation insulation fault from machine examination, and the voltage of positive closing bus bar is less than the absolute value of the voltage of negative closing bus bar, controlled processing unit can throw resistance R12 to change the resistance of the first resistance unit, also resistance R22 can be thrown to change the resistance of the second resistance unit, preferably, resistance R22 is thrown to change the resistance of the second resistance unit, to reduce the difference of the absolute value of the voltage on positive and negative DC bus; And when the first insulation measures closing bus bar generation insulation fault from machine examination, and the voltage of positive closing bus bar is greater than the absolute value of the voltage of negative closing bus bar, controlled processing unit can throw resistance R12 to change the resistance of the first resistance unit, also resistance R22 can be thrown to change the resistance of the second resistance unit, preferably, throw resistance R12 to change the resistance of the first resistance unit, to reduce the difference of the absolute value of the voltage on positive and negative DC bus.In addition, when the second insulation measures control bus generation insulation fault from machine examination, and the voltage of positive control bus is less than the absolute value of the voltage of negative control bus, controlled processing unit can throw resistance R12 to change the resistance of the first resistance unit, also resistance R22 can be thrown to change the resistance of the second resistance unit, preferably, resistance R22 is thrown to change the resistance of the second resistance unit, to reduce the difference of the absolute value of the voltage on positive and negative DC bus; And when the second insulation measures control bus generation insulation fault from machine examination, and the voltage of positive control bus is greater than the absolute value of the voltage of negative control bus, controlled processing unit can throw resistance R12 to change the resistance of the first resistance unit, also resistance R22 can be thrown to change the resistance of the second resistance unit, preferably, throw resistance R12 to change the resistance of the first resistance unit, to reduce the difference of the absolute value of the voltage on positive and negative DC bus.

Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).

It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.

It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.

The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.

Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (13)

1. a method for insulation resistance detection, is characterized in that, comprising:

After the position determining DC bus generation insulation fault, between positive direct-current bus and ground wire, access the first resistance unit of preset resistive value, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value;

According to the position of DC bus generation insulation fault, determine flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; Described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

2. the method for claim 1, is characterized in that, according to the position that insulation fault occurs in DC bus, determines flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance, specifically comprises:

If the position that insulation fault occurs is positioned at closing bus bar, then determines according to the voltage difference between positive closing bus bar and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative closing bus bar and ground wire the electric current flowing through the 4th resistance;

If the position that insulation fault occurs is positioned at control bus, then determines according to the voltage difference between positive control bus and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative control bus and ground wire the electric current flowing through the 4th resistance.

3. the method for claim 1, it is characterized in that, according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance, specifically comprise:

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the first resistance unit; And determine to flow through the electric current of the first resistance unit after resistance adjustment, and flow through after the resistance determining adjustment first resistance unit the second resistance unit electric current, flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance;

According to determine flow through resistance adjustment after the first resistance unit electric current, adjust the first resistance unit resistance after flow through the electric current of the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to described first relational expression and described second relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

4. the method for claim 1, it is characterized in that, according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance, specifically comprise:

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the second resistance unit; And determine to flow through the electric current of the second resistance unit after resistance adjustment, and flow through after the resistance determining adjustment second resistance unit the first resistance unit electric current, flow through the electric current of the 3rd resistance, flow through the electric current of the 4th resistance;

According to the electric current flowing through the second resistance unit after resistance adjustment determined, flowing through the electric current of the first resistance unit after adjusting the resistance of the second resistance unit, flow through the electric current of the 3rd resistance, flowing through the electric current sum of the 4th resistance is zero, determines the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to described first relational expression and described 3rd relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

5. a device for insulation resistance detection, is characterized in that, comprising:

Module is set, for after the position determining DC bus generation insulation fault, between positive direct-current bus and ground wire, accesses the first resistance unit of preset resistive value, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value;

First determination module, for the position according to DC bus generation insulation fault, determines flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance; Described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

Second determination module, for according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determines the resistance of the 3rd resistance and the resistance of the 4th resistance.

6. device as claimed in claim 5, is characterized in that, described first determination module specifically for:

If the position that insulation fault occurs is positioned at closing bus bar, then determines according to the voltage difference between positive closing bus bar and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative closing bus bar and ground wire the electric current flowing through the 4th resistance;

If the position that insulation fault occurs is positioned at control bus, then determines according to the voltage difference between positive control bus and ground wire the electric current flowing through the 3rd resistance, and determine according to the voltage difference between negative control bus and ground wire the electric current flowing through the 4th resistance.

7. device as claimed in claim 5, is characterized in that, described second determination module specifically for:

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the first resistance unit; And determine to flow through the electric current of the first resistance unit after resistance adjustment, and flow through after the resistance determining adjustment first resistance unit the second resistance unit electric current, flow through the electric current of the 3rd resistance and flow through the electric current of the 4th resistance;

According to determine flow through resistance adjustment after the first resistance unit electric current, adjust the first resistance unit resistance after flow through the electric current of the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to described first relational expression and described second relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

8. device as claimed in claim 5, is characterized in that, described second determination module specifically for:

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the second resistance unit; And determine to flow through the electric current of the second resistance unit after resistance adjustment, and flow through after the resistance determining adjustment second resistance unit the first resistance unit electric current, flow through the electric current of the 3rd resistance, flow through the electric current of the 4th resistance;

According to the electric current flowing through the second resistance unit after resistance adjustment determined, flowing through the electric current of the first resistance unit after adjusting the resistance of the second resistance unit, flow through the electric current of the 3rd resistance, flowing through the electric current sum of the 4th resistance is zero, determines the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to described first relational expression and described 3rd relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance.

9. the equipment of an insulation resistance detection, it is characterized in that, comprise insulation main frame and insulate from machine, described insulation main frame connects positive direct-current bus, negative DC bus and ground wire respectively, and described insulation connects positive closing bus bar, negative closing bus bar, positive control bus and negative control bus respectively from machine;

Described insulation is from machine, for determining the position that insulation fault occurs in DC bus, and send announcement information to insulation main frame, for notifying that insulation main frame accesses the first resistance unit of preset resistive value between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access the second resistance unit of preset resistive value; And after the first indication information receiving the transmission of insulation main frame, according to the position that insulation fault occurs in DC bus, to insulation main frame, to send voltage in the first bus be the voltage of positive bus, and to send voltage in the first bus to insulation main frame be the voltage of negative bus; If the position that insulation fault occurs is positioned at closing bus bar, then described first bus is closing bus bar; If the position that insulation fault occurs is positioned at control bus, then described first bus is control bus;

Described insulation main frame, for after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus and ground wire between positive direct-current bus and ground wire; And send the first indication information to insulation from machine, being used to indicate insulation, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine be the voltage of negative bus; And be the voltage of positive bus according to voltage in the first bus received, determine that in the first bus, voltage is voltage difference between positive bus and ground wire, and be the electric current that between positive bus and ground wire, voltage difference determines to flow through the 3rd resistance according to voltage in the first bus; Be the voltage of negative bus according to voltage in the first bus received, determine that in the first bus, voltage is the voltage difference between negative bus and ground wire, and be the voltage difference between negative bus and ground wire according to voltage in the first bus, determine the electric current flowing through the 4th resistance; And according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance; Wherein, described 3rd resistance is that in the first bus, voltage is the insulation against ground resistance of positive bus, and described 4th resistance is that in the first bus, voltage is the insulation against ground resistance of negative bus.

10. equipment as claimed in claim 9, is characterized in that, described insulation comprises the first insulation from machine and insulate from machine from machine and second; Described first insulation connects positive closing bus bar and negative closing bus bar from machine; Described second insulation connects positive control bus and negative control bus from machine;

Described first insulation is from machine, for when closing bus bar generation insulation fault being detected, announcement information is sent to insulation main frame, for notifying that insulation main frame accesses described first resistance unit between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access described second resistance unit; And after receiving the first indication information, send the voltage of positive closing bus bar and the voltage of negative closing bus bar to insulation main frame;

Described second insulation is from machine, for when control bus generation insulation fault being detected, announcement information is sent to insulation main frame, for notifying that insulation main frame accesses described first resistance unit between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access described second resistance unit; And after receiving the first indication information, send the voltage of positive control bus and the voltage of negative control bus to insulation main frame;

Described insulation main frame, for after receiving announcement information, accesses the first resistance unit, and access the second resistance unit between negative DC bus and ground wire between positive direct-current bus and ground wire; And send the first indication information to sending the insulation of announcement information from machine, being used to indicate the insulation sending announcement information, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine be the voltage of negative bus.

11. equipment as claimed in claim 10, it is characterized in that, described insulation main frame comprises controlled processing unit, the first resistance unit and the second resistance unit, and described controlled processing unit connects the first insulation from machine, the second insulation from machine, the first resistance unit, the second resistance unit, positive direct-current bus, negative DC bus and ground wire;

Described controlled processing unit, for after receiving announcement information, controls the first resistance unit and is linked between positive direct-current bus and ground wire, and controls the second resistance unit and be linked between negative DC bus and ground wire; And send the first indication information to sending the insulation of announcement information from machine, being used to indicate the insulation sending announcement information, to send voltage in the voltage and the first bus that voltage the first bus is positive bus from machine be the voltage of negative bus; And be the voltage of positive bus according to voltage in the first bus received, determine that in the first bus, voltage is voltage difference between positive bus and ground wire, and be the electric current that between positive bus and ground wire, voltage difference determines to flow through the 3rd resistance according to voltage in the first bus; Be the voltage of negative bus according to voltage in the first bus received, determine that in the first bus, voltage is the voltage difference between negative bus and ground wire, and be the voltage difference between negative bus and ground wire according to voltage in the first bus, determine the electric current flowing through the 4th resistance; And according to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the resistance of the 3rd resistance and the resistance of the 4th resistance;

Described first insulation is from machine, for when closing bus bar generation insulation fault being detected, announcement information is sent to controlled processing unit, for notifying that controlled processing unit accesses described first resistance unit between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access described second resistance unit; And after receiving the first indication information, send the voltage of positive closing bus bar and the voltage of negative closing bus bar to controlled processing unit;

Described second insulation is from machine, for when control bus generation insulation fault being detected, announcement information is sent to controlled processing unit, for notifying that controlled processing unit accesses described first resistance unit between positive direct-current bus and ground wire, and between negative DC bus and ground wire, access described second resistance unit; And after receiving the first indication information, send the voltage of positive control bus and the voltage of negative control bus to controlled processing unit.

12. equipment as claimed in claim 11, is characterized in that, described controlled processing unit specifically for:

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the first resistance unit;

Send the second indication information to sending the insulation of announcement information from machine, the insulation being used to indicate described transmission announcement information voltage from the first bus after machine sends the resistance of adjustment first resistance unit is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus;

Be the voltage of positive bus according to voltage in the first bus after the resistance of adjustment first resistance unit received, determine that in the first bus after the resistance of adjustment first resistance unit, voltage is voltage difference between positive bus and ground wire, and be voltage difference between positive bus and ground wire according to voltage in the first bus after the resistance of adjustment first resistance unit, flow through the electric current of the 3rd resistance after determining the resistance of adjustment first resistance unit; And be the voltage of negative bus according to voltage in the first bus after the resistance of adjustment first resistance unit received, determine that in the first bus after the resistance of adjustment first resistance unit, voltage is voltage difference between negative bus and ground wire, and be voltage difference between negative bus and ground wire according to voltage in the first bus after the resistance of adjustment first resistance unit, flow through the electric current of the 4th resistance after determining the resistance of adjustment first resistance unit; And determine the electric current of the first resistance unit flow through after resistance adjustment; And after the resistance determining adjustment first resistance unit, flow through the electric current of the second resistance unit;

Flow through the electric current of the second resistance unit, the electric current flowing through the 3rd resistance after resistance according to the electric current flowing through the first resistance unit after resistance adjustment determined and adjustment the first resistance unit and the electric current sum that flows through the 4th resistance is zero, determine the second relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to the first relational expression and the second relational expression, determine the resistance of the 3rd resistance and the resistance of the 4th resistance;

The insulation of described transmission announcement information from machine also for, after receiving the second indication information, in the first bus after controlled processing unit sends the resistance of adjustment first resistance unit, voltage is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus.

13. equipment as claimed in claim 11, is characterized in that, described controlled processing unit specifically for:

According to flowing through the electric current of the first resistance unit, the electric current flowing through the second resistance unit, the electric current flowing through the 3rd resistance and the electric current sum that flows through the 4th resistance is zero, determine the first relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

Adjust the resistance of the second resistance unit;

Send the 3rd indication information to the insulation sending announcement information from machine, the insulation being used to indicate described transmission announcement information voltage from the first bus after machine sends the resistance of adjustment second resistance unit is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus;

Be the voltage of positive bus according to voltage in the first bus after the resistance of adjustment second resistance unit received, determine that in the first bus after the resistance of adjustment second resistance unit, voltage is voltage difference between positive bus and ground wire, and be voltage difference between positive bus and ground wire according to voltage in the first bus after the resistance of adjustment second resistance unit, flow through the electric current of the 3rd resistance after determining the resistance of adjustment second resistance unit; And be the voltage of negative bus according to voltage in the first bus after the resistance of adjustment second resistance unit received, determine that in the first bus after the resistance of adjustment second resistance unit, voltage is voltage difference between negative bus and ground wire, and be voltage difference between negative bus and ground wire according to voltage in the first bus after the resistance of adjustment second resistance unit, flow through the electric current of the 4th resistance after determining the resistance of adjustment second resistance unit; And after determining the resistance of adjustment second resistance unit, flow through the electric current of the first resistance; And determine the electric current of the second resistance unit after flowing through resistance adjustment;

According to the electric current flowing through the second resistance unit after resistance adjustment determined, with flow through the electric current of the first resistance unit after the resistance of adjustment second resistance unit, the electric current flowing through the 3rd resistance, the electric current sum that flows through the 4th resistance be zero, determines the 3rd relational expression between the resistance of the 3rd resistance and the resistance of the 4th resistance;

According to the first relational expression and the 3rd relational expression, determine the resistance of the first resistance and the resistance of the second resistance;

The insulation of described transmission announcement information from machine also for, after receiving the 3rd indication information, in the first bus that insulation main frame sends after the resistance of adjustment second resistance unit, voltage is that in the voltage of positive bus and the first bus, voltage is the voltage of negative bus.