Technical parameters

1 Rated parameters of the complete vehicle

2Rated operating voltage: 10KV, 6KV

3Rated current: 6KV: 50A, 100A, 200A, 315A, 400A, 500A, 630A

10KV: 50A, 100A, 200A, 315A, 400A, 500A, 630A

4 Rated frequency: 50Hz

5Rated short-circuit breaking current 12.5KA (effective value)

6Rated short-circuit making current 31.5KA (peak value)

7 Rated dynamic stability current (rated peak withstand current) 31.5KA (peak value)

8 Rated thermal stability current (rated short-time withstand current) 12.5KA (effective value)

9The rated thermal stability (short-term withstand) time is not less than 2s

10 The breaking frequency of the rated short-circuit breaking current is 30 times. For operation sequence, see Table 1

Table 1

11 For rated insulation level, see Table 2 Table 2

12For voltage class, electrical clearance and creepage distance, see Table 3

Table 3

13 For main technical parameters of the circuit breaker, see Table 4

Table 4

14. The supporting JSZW3-6, 10 voltage transformer is three-phase five-column type. The basic technical parameters are shown in Table 5

Table 5

15. The supporting LMZ-6, 10 double-pole current transformer is divided into the signal source and current source winding.

The current source winding satisfies requirements in Table 6

Table 6

The maximum output power of the current source winding shall not be less than 25VA, that is to say, when the primary passes through over 4 times of the rated current, and the secondary is connected with 25Ω (COSΦ=1) load, the secondary current shall not be less than 1A.

16. Integrated protection of the high-voltage switch has electric leakage, short circuit, overload, under-voltage, overvoltage, insulation monitoring and other protection functions, and the specific indicators are as follows:

17. Rated supply voltage of relay protection

The rated supply voltage of relay protection shall be AC 100V (50Hz), the power consumed shall not be larger than 30VA, and it shall reliably work within the range of 75%~120% rated voltage.

18. Overcurrent protection

The inverse time limit characteristics of overcurrent and delay time shall conform to Table 1:

Table I: table of overload inverse time limit

Ie represents the rated operating current set on the power distribution device. In case of interrupted overload, inverse time limit protection shall be implemented during release of overload energy and accumulated calculation.

19 Short circuit protection

The action current of short circuit protection shall be set at discretion according to 1.5-10 times of the rated current value, the error in setting value shall not exceed ±10％, and the short circuit protection action time shall be less than 0.1s.

20 Cable insulation monitoring protection

Insulation monitoring protection shall be implemented for shielded core wire and shielded bottom wire used at the load side of the power distribution device, monitoring overlimit alarm and action. Insulation monitoring can be turned on or off. For insulation monitoring protection characteristics, see Table 2.

Table 2 Table of insulation monitoring protection action characteristics

21 Grounding (leakage) protection

For single-phase grounding failure appearing in the electricity grid, the electric leakage mode is: current type, voltage type, power type and direction type.

a. Current type, i.e., the protector only acts based on the zero sequence current. When the zero sequence current in the power grid reaches the setting value, the protector acts.

b. Voltage type, i.e., the protector only acts based on the zero sequence voltage. When the zero sequence voltage in the power grid reaches the setting value, the protector acts.

c. Power type, i.e., the protector must make protection action when the zero-sequence voltage and zero sequence current reach the setting value simultaneously. It will not make action if only one is reached.

d. Direction type, i.e., the protector must make action when the zero-sequence voltage and zero sequence current reaches the setting value, and the phase positions are the same (0-180°).

3.5.6 Voltage protection

a. Low voltage protection

Reliable protection when the electricity grid voltage is reduced below 75％of the rated value.

Low voltage protection action time ≤5s.

b. Overvoltage protection

Reliable protection when the electricity grid voltage is reduced over 115% of the rated value.

Overvoltage protection action time ≤5s.

The action value of low-voltage and overvoltage protection can be appointed and preset by the user.

22 Power grid real-time voltage display: line voltage (V)

Measuring range: 6KV and 10KV (any display mode can be selected, that is to say, please select 6KV display mode if used on 6KV high-voltage power distribution device). Precision ±8％.

23 Phase balance:

In case of broken circuit of any phase power supply or it is lower than or higher than 60％of the load current of other two phases, make protection action after time delay of 5 to 30s. The phase balance function is arranged with on and off menu, and the user can select on or off freely.

24 Gas blocking:

It is used with the gas breaker. After the gas breaker action is output, power off, and display gas overlimit.

25The current electricity grid voltage and load current value are displayed in Chinese character, protection action cause.

2611 Long-term memory of the trip reason (it can be consulted repeatedly), Previous 100 times failure trip reason and time recording. Failure can be memorized after power off.

27It can record the accumulated opening and closing frequency.

28 Digital watch function, it can accurately position the off-work time.

29 System password function, it prevents operation by the unrelated personnel.

30 Intrinsically safe parameters (not required for the non-communication model)

485 communication output circuit is intrinsically safe, 485A, 485B and COM three communication signal wire can independently work and form loop without power supply.

Good explosion-proof performance, advanced technologies, stable and reliable protection performance, compact structure, easy for maintenance and overhaul. The intelligent multi-functional integrated protector with advanced technologies is selected for the power distribution device, which has reliable and sensitive protection and high measurement accuracy. Combining the Chinese menu human-computer interaction, the display information is rich, and operation is simple and intuitive.

1. Appearance structure (Appearance structure I)

(1) The power distribution device consists of the underframe and the rectangular explosion-proof shell. The explosion-proof shell consists of the main chamber, box door, rear cover (two) and rear wiring chamber. The explosion-proof shell has the rectangular solid structure. It is divided into the front and rear chambers with a partition board in the middle, which are the independent explosion-proof parts.

(2) Six male pin stationary contact blocks and two seven-core terminals are installed on the intermediate diaphragm. The illuminating lamp is installed at the upper left corner of the division board. The rear chamber is the wiring chamber, which is divided into upper and lower chambers (the intermediate insulating baffle does not have the explosion-proof function). The upper chamber is the power incoming line. The lower chamber is load outgoing line, the outlet of the high-voltage cable of the lower chamber is installed with a zero sequence current transformer, and a compression nut is arranged at the left and right plates respectively (the user can lead out the control line, realizing remote control).

(3) The handcart type high-voltage vacuum circuit breaker and ancillary operating mechanism are installed in the main chamber. The handcart high-voltage vacuum circuit breaker consists of the vacuum circuit breaker, trolley, three-phase five-column voltage transformer, bus cross-core current transformer, microcomputer comprehensive protection device, piezoresistance, isolating male pin moving contact and so on. The electrical components are installed on the trolley. In case of any failure of the core, the trolley can be pulled out of the box, so as to facilitate maintenance or replace the spare machine core. The microcomputer comprehensive protection device has overload, short circuit, electric leakage, cable insulation monitoring and other protection functions; it has the current and voltage display functions; it has the failure type text representation function.

(4) The shall has the live knot bolt pressure plate type quick door opening structure, and has the reliable mechanical locking device: (a) The mechanical locking device with load isolation is arranged at the right axle head of the main shaft of circuit breaker closing and the track cover (see Attached drawing II). When the isolating male pin is at the closed state, and the vacuum circuit breaker is closed, the locking mechanism acts, and the isolating male pin cannot be pulled out. (b) The power distribution device is also arranged with the locking mechanism of door opening and isolating male pin opening and closing linkage (see Attached drawing III). When the box door is opened, power off the vacuum circuit breaker to release locking (see attached drawing II), and the isolating male pin is pulled open. At the same time, it is allowed to insert the locking lever in the axle sleeve on the isolating mechanism, and the locking lever is unscrewed out of the box door bolt hole. Meanwhile, insert it in the axle sleeve of the isolating mechanism, and the isolating male pin cannot be connected. When it is required to connect the isolating male pin, screw the locking lever in the front door bolt hole, the isolating mechanism axle sleeve is not restricted, the isolating male pin can be inserted, but the box door cannot be opened. That is to say: after the isolating male pin is opened in place, screw the locking lever out of the front door bolt hole, and the box door can be opened; after the box door is opened, the isolating male pin cannot be closed; after the isolating male pin is closed in place, the vacuum circuit breaker can be closed; the isolating male pin cannot be opened or closed with load. The propulsion mechanism installed at the right of the main chamber is to promote the circuit breaker trolley forward and backward, and realize closing and opening of the isolating male pin. There is a cover, track and extended track on the main chamber floor, which is used for circuit breaker trolley travel. The manual closing axle and manual tripping handle of the circuit breaker are also arranged at the right side of the main chamber. There is an observation window at the left and right sides at the rear of the main chamber respectively, and one can see opening and closing status of the isolating male pin.

2. Device on the door

There are electrical energy display, Chinese character display and opening and closing display convenient for observation on the box door. Seven buttons of lighting, start, stop, electric leakage, displacement, confirm and resetting are also arranged.

3. Wiring scheme of the main circuit

There are four kinds of main circuit wiring schemes of the power distribution device according to the function in the system:

Type A: see Figure 1 for the primary wiring scheme. There are two power incoming ends, and the power distribution device can be used separately and in a combined way.

Type B: see Figure 2 for the primary wiring scheme. There is a power incoming end, and the other end is connected with the long sleeve. That is to say, the power supply side is single loop feed in, and the load side is single loop feed out. The power distribution device can be used separately and in a combined way.

Type C: see Figure 3 for the primary wiring scheme. There is a power incoming side, and the other end is sealed with the end cover, i.e., single loop feed in and single loop feed out. The power distribution device can be used separately or as the main switch, and can also be used in a combined way.

Type D: see Figure 4 for the primary wiring scheme. The primary wiring scheme has no incoming end, and the three-phase power is directly connected with the wiring terminal of the switch from the cable line of the adjacent switch. When multiple power distribution devices are combined for use in the chamber,the power distribution device is only taken as the branch switch. It cannot be used separately, and can only be used in a combined way.

The cable head in Scheme A, B and C above can only be armored, and can be rubber-sheathed cable head. It shall be indicated during order by the user. If there is no instruction, it shall be equipped with the armored cable head.

V. Electrical principle

Working principle of the main circuit:

6KV (10KV) three-phase power supply is introduced from the power junction box of the power distribution device. It is output to the load from the curved cable port in the rear chamber through the upper isolating male pin, vacuum circuit breaker and lower isolating male pin.

Electrical principle (see the electrical schematic diagram)

After the isolating male pin is inserted in place, 6KV (10KV) power supply generates three-phase AC 100V voltage by the three-phase five-pole voltage transformer through high-voltage fuse FU-G, and supplies power for computer protection and switch through the secondary fuse.

Electric closing loop: press QA closing button, the circuit breaker is closed, and the closing lamp is on.

Electric opening loop: press TA opening button, the circuit breaker is opened synchronously, and the opening lamp is on.

Protection action opening circuit:

In case of any protection action of overload, short circuit, electric leakage, monitoring, overvoltage, under-voltage and so on, the comprehensive protection device outputs the opening signal, the circuit breaker is opened, and the opening lamp is on.

Manual opening:

The operator can complete circuit breaker opening through the manual trip device.

Failure of overload, short circuit, electric leakage, monitoring, overload and under-voltage circuit shall be automatically handled by the microcomputer. Therefore, in case of any failure, the corresponding Chinese display can be memorized for a long term. The first 100 times failure trip reason and time records can be consulted repeatedly.