CN208706427U - A kind of capacitance type potential transformer of independent measure and protective loop - Google Patents

Abstract

It include 2 groups of high-voltage capacitances in parallel in mutual inductor awl the utility model discloses the capacitance type potential transformer of a kind of independent measure and protective loop；Every group of capacitor is 2 concatenated high-voltage capacitance series connection；Wherein one group of high-voltage capacitance is general precision, is shielded；Another set high-voltage capacitance is high-accuracy capacitor, plays metering, while also as the spare of protection.The utility model plays a protective role when can damage high-voltage capacitance, and controller uses the information in the high-voltage capacitance circuit of metering automatically, realizes defencive function；Every group of capacitor distinguishes external low-voltage capacitance, while realizing electromagnetic isolation, to solve the safety problem in EVT application very well.

Description

A kind of capacitance type potential transformer of independent measure and protective loop

Technical field

The utility model belongs to the capacitor of voltage transformer technical field more particularly to a kind of independent measure and protective loop Formula voltage transformer.

Background technique

With the popularization of distribution automation equipment, Nanning barrier has increased a large amount of automation complete set of equipments newly, existing to match Automation ring network cabinet is to solve safety problem, is abandoned using yield rate is low, is easy breakdown high-precision high voltage capacitor, existing EVT safety and measurement in order to balance, mostly use the higher general precision high-voltage capacitance of yield rate greatly, but measurement accuracy is low, it is difficult To realize protection and high-acruracy survey simultaneously.

Meanwhile to improve measurement accuracy in the case where reducing volume, distribution automation ring network cabinet is largely all made of Electronic voltage mutual induction device acquires route voltage value, but when insulation breakdown or sectional pressure element damage occurs in the high-pressure section of EVT When, how to guarantee that high pressure is not transferred to low-pressure side, causes the damage of control equipment even to cause human safety issues, tradition Way, be all low-pressure side increase isolating transformer, but due to the general pressure voltage of the isolating transformer of current low pressure all only Have between 900~4000V, so carry out effective protection that can not really to secondary device.

Utility model content

The utility model in view of the above shortcomings of the prior art, using high voltage protection measure, with the height of two groups of different accuracies Voltage capacitance is in parallel, then external low-voltage equipment, solves the safety problem in EVT application very well, and realize high-precision measuring simultaneously. Using following specific technical solution:

To achieve the goals above, the utility model adopts the following technical solutions:

A kind of capacitance type potential transformer of independent measure and protective loop, including insulation inner cone, mutual inductor awl, connection Conducting wire, conducting rod and bolt, cone top part is provided with high pressure stem in the insulation, and insulation inner cone bottom is provided with bolt, bolt It is detachably connected with calutron；The embedded bottom that insulation inner cone is set of mutual inductor awl；The mutual inductor awl includes Capacitor, the conducting rod both ends are contacted with the high pressure stem of capacitor and the inner cone that insulate respectively；The capacitor includes 2 groups in parallel Capacitor, connecting wire form 2 plant-grid connection points, plant-grid connection point from every group of capacitor low-voltage side outlet, in mutual inductance awl bottom It is electrically connected with calutron.

Based on above structure, 2 groups of capacitors are in parallel, and the capacitor that can be realized 2 parallel lines is used as to protect respectively and be measured, Avoid protection is mixed with metering from interfering with each other；When the capacitor of protection is breakdown, the capacitor that original is used as metering is used as protection, it is ensured that The stable operation of power grid.

Further, the capacitor is high-voltage capacitance, and 2 groups of high-voltage capacitances are in parallel simultaneously and are encapsulated in mutual inductor together In awl, make capacitance type potential transformer that there is high security, secondary voltage liter doubles, can remind and go wrong.

Further, every group of capacitor is 2 high-voltage capacitance series connection, and when guaranteeing that high-pressure section is breakdown, high pressure will not be passed It is delivered to low-pressure side, and since the total capacity of high-voltage capacitance becomes smaller, the voltage of low-pressure side can be caused to increase, so as to cause controller Alarm, staff's equipment for replacing damage as early as possible is reminded, to solve the safety problem in EVT application very well.

Further, the high-voltage capacitance is Ceramic high-pressure capacitor, and resistance to voltage levels are high, and resistance to voltage levels are 45KV.

Further, wherein one group of high-voltage capacitance is general precision, precision 2.0-3.0 shields；Simultaneously because The high-voltage capacitance precision that protective loop uses is lower, and the electricity for the general precision that production high-accuracy capacitor process generates can be used Hold, avoids wasting.

Further, wherein one group of high-voltage capacitance is high-accuracy capacitor, precision 0.5-1.0 plays metering, while As the spare of protection；When the high-voltage capacitance damage to shield, controller uses the high-voltage capacitance of metering to return automatically The information on road realizes defencive function, while carrying out device failure alert, and staff is reminded to replace damage equipment as early as possible, it is ensured that The stable operation of power grid.

Further, the calutron is internally provided with 2 low-voltage capacitances, every low-voltage capacitance respectively with it is corresponding One group of high-voltage capacitance is connected by the plant-grid connection point formed in mutual inductor awl bottom, and 2 groups of capacitors of mutual inductor awl pass through Connecting wire is connected with external low-voltage capacitance, realizes electromagnetic isolation.

Further, the low-voltage capacitance both ends connect coil, the secondary independent grounding of low-voltage capacitance, it is ensured that staff Personal safety.

Further, mutual inductor awl further includes epoxy resin, and the epoxy resin is conical, in realization and insulation Plug type connection between cone, facilitates installation and removal；It is not necessary that mutual inductor to be installed to inside SF6 gas tank, in addition part is put Electricity is small, is highly suitable for the equipment such as ring network cabinet, the switchgear of mesolow；Epoxy inner encapsulates capacitor, conducting rod and leads Line, the connecting wire form plant-grid connection point in epoxy resin bottom, pass through from the low-voltage side outlet of capacitor, connecting wire Capacitor, conducting rod and conducting wire are wrapped up using the epoxy resin of insulation, safety with higher.

It further, further include sealing sheath, the outside of the epoxy resin and the inside of insulation inner cone are closely arranged There is sealing sheath, i.e., has wrapped up sealing sheath on the outside of epoxy resin；Mutual inductor awl is squeezed into insulation inner cone when installation, is allowed Insulated enclosure sheath is tightly wrapped on mutual inductor awl, has almost prevented the possibility of creeping discharge so that shelf depreciation very It is small.

Utility model has the advantages that

1,2 groups of high-voltage capacitances are in parallel, and the capacitor that can be realized 2 parallel lines is used as to protect respectively and be measured, and avoid wave Expense protection is mixed with metering to be interfered with each other, simultaneously because the capacitance accuracy that protective loop uses is lower, it is high-precision that production can be used The capacitor for spending the general precision that capacitive process generates, avoids wasting；When the high-voltage capacitance of protection is breakdown, original is used as metering High-precision high-voltage capacitance is used as protection, it is ensured that the stable operation of power grid；

2, it using high voltage protection measure, is connected using the higfh-tension ceramics capacitor of two panels high voltage level, guarantees high-pressure section When breakdown, high pressure will not be passed to low-pressure side, and since the total capacity of high-voltage capacitance becomes smaller, can cause the electricity of low-pressure side Pressure increases, so as to cause the alarm of controller, the equipment for reminding staff to replace damage as early as possible, to solve EVT very well Safety problem in；

3, high-voltage capacitance and external low-voltage capacitance, liftoff current potential is remote, and partial discharge is small, realizes electromagnetic isolation；Low-voltage capacitance simultaneously Secondary independent grounding, it is ensured that the personal safety of staff；

4, epoxy resin is encapsulated in capacitor interior, highly-safe；Epoxy resin is conical, realize mutual inductor awl and absolutely Plug type connection between edge inner cone, it is not necessary that mutual inductor is installed to inside SF6 gas tank, in addition shelf depreciation is small, it is very suitable The equipment such as ring network cabinet, switchgear for mesolow.

Detailed description of the invention

Fig. 1 is the structural representation of a kind of independent measure of the utility model and the capacitance type potential transformer of protective loop Figure；

Fig. 2 be a kind of independent measure of the utility model and the capacitance type potential transformer of protective loop insulation inner cone and The right view of mutual inductor awl；

Fig. 3 is the schematic diagram of a kind of independent measure of the utility model and the capacitance type potential transformer of protective loop.

Specific embodiment

The utility model is described in detail below in conjunction with attached drawing:

In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as " on top ", " bottom surface " For be based on the orientation or positional relationship shown in the drawings or the utility model product using when the orientation or position usually put Relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

The capacitance type potential transformer of a kind of independent measure and protective loop as depicted in figs. 1 and 2, including insulation inner cone 1, mutual inductor awl 2, connecting wire 3, conducting rod 4, bolt 5, inserts 6, sealing sheath 7, push rod spring 8, high pressure stem 9, electromagnetism Device 10 and low-voltage capacitance 11；High pressure stem 9 is provided at the top of insulation inner cone 1, insulation 1 bottom of inner cone is provided with bolt 5, passes through spiral shell The realization of bolt 5 insulation inner cone 1 is detachably connected with calutron 10；The embedded bottom that insulation inner cone 1 is set of mutual inductor awl 2 Portion, mutual inductor awl 2 include 2 groups of concatenated Ceramic high-pressure capacitors 21 and epoxy resin 22, and every group of Ceramic high-pressure capacitor 21 is 2 The series connection of Ceramic high-pressure capacitor, wherein one group of Ceramic high-pressure capacitor 21 is general precision, precision 2.0-3.0 shields, separately Outer one group of Ceramic high-pressure capacitor 21 is high-accuracy capacitor, and precision 0.5-1.0 plays metering, while also as the standby of protection With；When the Ceramic high-pressure capacitor 21 of protection is breakdown, controller uses 21 circuit of Ceramic high-pressure capacitor of metering automatically Information realizes defencive function, while carrying out device failure alert, reminds staff to replace damage equipment as early as possible, it is ensured that power grid Stable operation；The resistance to voltage levels of Ceramic high-pressure capacitor 21 are 45KV；22 enclosed inside of epoxy resin Ceramic high-pressure capacitor 21, Conducting rod 4 and connecting wire 3,4 both ends of conducting rod are contacted with the high pressure stem 9 of Ceramic high-pressure capacitor 21 and the inner cone 1 that insulate respectively； 8 both ends of push rod spring are separately positioned in the high pressure stem 9 at 1 top of conducting rod 4 and insulation inner cone, therefore conducting rod 4 has centainly Activity, it is convenient to be connect with other components.

The connecting wire is from the low-voltage side outlet of every group of Ceramic high-pressure capacitor 21, and connecting wire 3 is in epoxy resin 22 2 plant-grid connection points are formed on bottom；Epoxy resin 22 is conical, realizes that mutual inductor awl 2 and the plug-in type for the inner cone 1 that insulate connect It connects, the bottom surface of epoxy resin 22 is provided with inserts 6, mutual inductor awl 2 is facilitated to remove, in the outside and insulation of epoxy resin 22 The inside of cone 1 is closely provided with sealing sheath 7, i.e., has wrapped up sealing sheath 7 on the outside of epoxy resin 22, and when installation bores mutual inductor Son 2 squeezes into insulation inner cone 1, and sealing sheath 7 is allowed tightly to be wrapped on mutual inductor awl 2, and sealing sheath 7 is exhausted using silicon rubber Edge sealing sheath.

Calutron 10 is internally provided with 2 low-voltage capacitances 11, and every low-voltage capacitance is high with corresponding one group of ceramics respectively Voltage capacitance 21 is connected by the plant-grid connection point formed in 22 bottom of epoxy resin, and 11 both ends of low-voltage capacitance connect coil, coil Resistance to voltage levels are 6000V, the secondary independent grounding of low-voltage capacitance.

Such as the capacitance type potential transformer of a kind of independent measure and protective loop of Fig. 3, dotted portion is to be wrapped in together 2 groups of Ceramic high-pressure capacitors 21 in parallel in epoxy resin 22, every group of Ceramic high-pressure capacitor 21 are 2 Ceramic high-pressure capacitor strings Connection；The external low-voltage capacitance 11 being arranged in calutron 10 of every group of Ceramic high-pressure capacitor 21, therefore liftoff point is remote；Low tension Hold 11 both ends connection coil, the secondary independent grounding of low-voltage capacitance.

Claims (10)

1. the capacitance type potential transformer of a kind of independent measure and protective loop, including insulation inner cone, mutual inductor awl, connection are led Line, conducting rod, bolt and calutron, cone top part is provided with high pressure stem in the insulation, and insulation inner cone bottom is provided with spiral shell Bolt, bolt are detachably connected with calutron；The embedded bottom that insulation inner cone is set of mutual inductor awl；The mutual inductor cone Attached bag includes capacitor, and the conducting rod both ends are contacted with the high pressure stem of capacitor and the inner cone that insulate respectively；

It is characterized in that, the capacitor includes 2 groups of capacitors in parallel, connecting wire is from every group of capacitor low-voltage side outlet, mutual Feel awl bottom and form 2 plant-grid connection points, plant-grid connection point and calutron are electrically connected.

2. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 1, which is characterized in that The capacitor is high-voltage capacitance.

3. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 2, which is characterized in that Every group of capacitor is 2 high-voltage capacitance series connection.

4. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 2, which is characterized in that The high-voltage capacitance is Ceramic high-pressure capacitor.

5. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 2, which is characterized in that Wherein one group of high-voltage capacitance is general precision, and precision 2.0-3.0 shields.

6. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 2, which is characterized in that Wherein one group of high-voltage capacitance is high-accuracy capacitor, and precision 0.5-1.0 plays metering.

7. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 2, which is characterized in that The calutron is internally provided with 2 low-voltage capacitances, and every low-voltage capacitance passes through with corresponding one group of high-voltage capacitance respectively In the plant-grid connection point series connection that mutual inductor awl bottom is formed.

8. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 7, which is characterized in that The low-voltage capacitance both ends connect coil, the secondary independent grounding of low-voltage capacitance.

9. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 1, which is characterized in that Mutual inductor awl further includes epoxy resin, and the epoxy resin is conical, and epoxy inner encapsulates capacitor, conducting rod And conducting wire, the connecting wire is from the low-voltage side outlet of capacitor, and connecting wire is in epoxy resin bottom formation plant-grid connection point.

10. the capacitance type potential transformer of a kind of independent measure and protective loop according to claim 9, feature exist In further including sealing sheath, the inside of the outside of the epoxy resin and insulation inner cone is closely provided with sealing sheath.