ABB offering

ABB offers the following range of products for the protec-tion and disconnecprotec-tion of DC networks.

Circuit breakers

Circuit breakers, devices carrying out the protection func-tion against overcurrents, are divided into three families including miniature circuit breakers, molded case circuit breakers and air circuit breakers.

Miniature circuit breakers

Miniature circuit breakers available for use in direct current are series S280UC, S800S UC and S800 PV.

Miniature circuit breakers series S280 UC comply with IEC 60947-2 and differ from the standard versions in that they are equipped with permanent magnetic elements on the internal arcing chambers. Such elements allow the electric arc to be broken, up to voltages equal to 440 VDC.

The presence of these permanent magnetic elements establishes the circuit breaker terminal (positive or nega-tive). As a consequence, their connection shall be carried out in compliance with the terminal indicated on the circuit breakers.

See the tables of Chapter 7: ”Choice of the protective de-vice” for information on pole connection.

Incorrect connection of the terminals could damage the circuit breaker.

S280 UC circuit breakers with a special version for DC ap-plications are available with characteristics B, C, K and Z.

S280 UC

Reference Standard IEC 60947-2

Rated current In [A] 0.5 ≤ In ≤ 40 50 ≤ In ≤ 63

Poles 1P, 2P

Rated voltage Ve 1P [V] 220 VDC

2P, 3P, 4P [V] 440 VDC

Insulation voltage Vi [V] 500

Max. operating voltage Vb max DC 1P [V] 220 VDC

DC 2P [V] 440 VDC

“Rated breaking capacity IEC 60947-2 1P - 220 VDC, 2P - 440 VDC”

Icu [kA] 6 4.5

Ics [kA] 6 4.5

Table 16. Electrical characteristics of the MCBs type S280 UC:

Table 17. Tmax IEC 60947-2

T1 1P T1 T2 T3 T4 T5 T6

Rated uninterrupted current, Iu (A) 160 160 160 250 250/320 400/630 630/800

Poles (Nr) 1 3/4 3/4 3/4 3/4 3/4 3/4

Rated service voltage, Ve V 125 500 500 500 750 750 750

Rated impulse withstand voltage, Uimp kV 8 8 8 8 8 8 8

Rated insulation voltage, Vi V 500 800 800 800 1000 1000 1000

Test voltage at industrial frequency for 1 min. V 3000 3000 3000 3000 3500 3500 3500

Rated ultimate short-circuit current, Icu B C N N S H L N S N S H L V N S H L V N S H L

250 VDC - 2 poles in series (kA) 25

(to 125V) 16 25 36 36 50 70 85 36 50 36 50 70 100 150 36 50 70 100 150 36 50 70 100

250 VDC - 3 poles in series (kA) - 20 30 40 40 55 85 100 40 55 - - - - - - - - - - - - -

-500 VDC - 2 poles in series (kA) - - - - - - - - - - 25 36 50 70 100 25 36 50 70 100 20 35 50 65

500 VDC - 3 poles in series (kA) - 16 25 36 36 50 70 85 36 50 - - - - - - - - - - - - -

-750 VDC - 3 poles in series (kA) - - - - - - - - - - 16 25 36 50 70 16 25 36 50 70 16 20 36 50

Utilization category (IEC 60947-2) A A A A A B (400 A) 1 - A (630 A) B 2

Insulation behavior ■ ■ ■ ■ ■ ■ ■

Thermomagnetic releases

T fixed, M fixed TMF ■ - - - - -

T adjustable, M fixed TMD - ■ ■ ■ ■ (up to 50 A) -

T adjustable, M adjustable (5…10 x In) TMA - - - - ■ (up to 250 A) ■ ■

T adjustable, M fixed (3 x In) TMG - - ■ ■ - -

T adjustable, M fixed (2,5...5 x I) TMG - - - - - ■

-Interchangeability - - - - ■ ■ ■

Versions F F-P F-P F-P F-P-W F-P-W F-W

1 Icw=5 kA

2 Icw=7.6 kA (630 A) - 10 kA (800 A)

The following tables show the DC electrical performances of Tmax MCCBs

Table 18. Tmax PV IEC 60947-3 MCSs

T1D PV T3D PV T4D PV T5D PV T6D PV T7D PV

Poles 4 4 4 4 4 4

Conventional thermal current, lth [A] 160 250 250 630 800 1600

Rated service current in category DC22 B, le [A] 160 200 250 500 800 1600

Rated service voltage, Ve [V] 1100 VDC 1100 VDC 1100 VDC 1100 VDC 1100 VDC 1100 VDC

Rated impulse withstand voltage, Uimp [kV] 8 8 8 8 8 8

Rated insulation voltage, Vi [V] 1150 VDC 1150 VDC 1150 VDC 1150 VDC 1150 VDC 1150 VDC

Test voltage at industrial frequency for 1 minute [V] 3500 3500 3500 3500 3500 3500

Rated short-circuit making capacity, MCS only, lcm [kA] 1.5 2.4 3 6 9.6 19.2

Rated short-time withstand current for 1s, lcw [kA] 1.5 2.4 3 6 9.6 19.2

Versions F F F F F F

Terminals FC Cu FC Cu FC Cu FC Cu FC CuAl FC CuAl

Mechanical life [no. operations] 25000 25000 20000 20000 20000 10000

Mechanical life [no. hourly operations] 120 120 120 120 120 60

Molded case circuit breakers

Table 19. Tmax UL 489

Tmax T1 Tmax T2 Tmax T3 Tmax Ts3 Tmax Ts3

Frame size [A] 100 100 225 150 225

Number of poles [Nr] 3-4 3-4 3-4 2-3-4 2-3-4

Rated voltage DC [V] 500 500 600 500

Interrupting ratings N S H N S N H L N H L

250V DC (2 poles in series) [kA rms] 25 25 35

500V DC (3 poles in series) [kA rms] 25 25 35

500V DC (2 poles in series) [kA rms] 35 50 65 20 35 50

600V DC (3 poles in series) [kA rms] 20 35 50

Trip units TMF ■ ■ ■ ■ ■

TMD/TMA

ELT ■

MA ■ ■ ■ ■

Electronic ■

Dimensions H [in/mm] 5.12/130 5.12/130 5.9/150 6.7/170 6.7/170

W 3p [in/mm] 3/76 3.54/90 4.13/105 4.13/105 4.13/105

D [in/mm] 2.76/70 2.76/70 2.76/70 4.07/103.5 4.07/103.5

Mechanical life [No. operations] 25000 25000 25000 25000 25000

Table 20. Tmax UL 489

Tmax T4 Tmax T5 Tmax T6

Frame size [A] 250 400-600 1 800

Number of poles [Nr] 2-3-4 2 2-3-4 2 3-4

Rated voltage DC [V] 600 600 600

Interrupting ratings N S H L V N S H L V N S H L

250V DC (2 poles in series) [kA rms]

500V DC (3 poles in series) [kA rms]

500V DC (2 poles in series) [kA rms] 25 35 50 65 100 25 35 50 65 100 35 35 50 65

600V DC (3 poles in series) [kA rms] 16 25 35 50 65 16 25 35 50 65 20 20 35 50

Trip units TMF ■

TMD/TMA ■ ■ ■

ELT MA

Electronic ■ ■ ■

Dimensions H [in/mm] 8.07/205 8.07/205 10.55/268

W 3p [in/mm] 4.13/105 5.51/140 8.26/210

D [in/mm] 4.07/103.5 4.07/103.5 4.07/103.5

Mechanical life [No. operations] 20,000 20,000 20,000

Table 21. DC rated currents available for the UL 489 Tmax circuit breakers with the different types of trip units

Caption

TMF = thermomagnetic trip unit with fixed thermal and magnetic threshold TMD = thermomagnetic trip unit with adjustable thermal and fixed magnetic threshold TMA = thermomagnetic trip unit with adjustable thermal and magnetic threshold MA = adjustable magnetic only trip unit

ABB offering

In T1

100

T3 225

Ts3 150/225

T4 250

T5 400

600/800 In T2

100

Ts3 150/225

TMF TMF TMF TMD TMA TMF TMA TMA MA MA

15 ■ ■ ■ ■ ■ 3 ■

20 ■ ■ ■ ■ ■ 5 ■

25 ■ ■ ■ ■ ■ 10 ■

30 ■ ■ ■ ■ ■ 20 ■ ■

35 ■ ■ ■ ■ 25 ■

40 ■ ■ ■ ■ ■ 50 ■ ■

50 ■ ■ ■ ■ ■ 100 ■ ■

60 ■ ■ ■ ■ ■ ■ 125 ■

70 ■ ■ ■ ■ ■ ■ 150 ■

80 ■ ■ ■ ■ ■ ■ 175 ■

90 ■ ■ ■ ■ ■ ■ 200 ■

100 ■ ■ ■ ■ ■ ■

125 ■ ■ ■ ■ ■

150 ■ ■ ■ ■ ■

175 ■ ■ ■ ■ ■

200 ■ ■ ■ ■ ■

225 ■ ■ ■ ■ ■

250 ■ ■ ■

300 ■

400 ■

600 ■

800 ■

Air circuit breakers

IEC Emax air circuit breakers equipped with DC PR122/

DC-PR123/DC electronic trip units are divided into four basic sizes. They have an application field from 800 A (E2) to 5000 A (E6) and current breaking capacities ranging from 35 kA to 100 kA (at 500 VDC).

By using the dedicated voltage module PR120/LV, the mini-mum rated operational voltage is 24 VDC.

Please refer to Chapter 7: ”Choice of the protective device”

for information on pole connection and supply voltage.

Thanks to their exclusive technology, the DC PR122DC-PR123/DC electronic trip units cover any possible installa-tion requirement and perform the same protecinstalla-tion funcinstalla-tions that were previously available for AC applications only.

The DC Emax circuit breakers keep the same overall dimen-sions and the electrical and mechanical accessories as the Emax range for AC applications.

Table 22. Electrical characteristics of DC Emax ACBs

E2 E3 E4 E6

Rated uninterrupted current, Iu

(A) B N N H S H H

(A) 800 1600 800 1600 1600 3200 3200

(A) 1000 1000 2000 2000 4000

(A) 1250 1250 2500 2500 5000

(A) 1600 1600 3200

(A) 2000

(A) 2500

Poles (Nr) 3/4 3/4 3/4 3/4

Rated operational voltage, Ue V < 1000 < 1000 < 1000 < 1000

Rated impulse withstand voltage, Uimp kV 12 12 12 12

Rated insulation voltage, Ui V 1000 1000 1000 1000

Rated ultimate breaking capacity under short-circuit, Icu

500

VDC (kA) 35 50 60 85 75 100 100

750

VDC (kA) 25 35 50 65 65 85 85

1000

VDC (kA) 25 35 35 65 50 65 65

Rated service breaking capacity under short-circuit, Ics

500

VDC (kA) 35 50 60 85 75 100 100

750

In addition to the standard protection functions (i.e. protection against overload and short-circuit), the PR122-PR123DC trip units offer some advanced protection functions summed up in the following table:

Thanks to a new human-machine interface, the electronic trip units allow complete control over the system.

More precisely, such releases provide the following measuring and control functions:

(1) for PR 123/DC only

(2) with communication module PR120/D-M

Protection functions PR122 PR123

Protection against overload with inverse long time-delay trip ^■ ^■

Selective protection against short-circuit inverse or definite short time-delay trip ^■ ^■ Second selective protection against short-circuit inverse or definite short time-delay trip ^■ Protection against instantaneous short-circuit with adjustable trip current threshold ^■ ^■

Protection against ground fault ■

Protection against phase unbalance ■

Protection against overtemperature (check) ■ ■

Protection against undervoltage ■

Protection against overvoltage ■

Protection against reverse active power ■

Thermal memory for functions L and S ■ ■

Table 23. PR122-PR123 Trip unit characteristics

Measurements

Event marking and maintenance data

Event marking with the instant it occurred ■

Chronological event storage ■

Counting the number of operations and contact wear ■

Communication with supervision system and centralised control

Remote parameter setting of the protection functions, unit configuration, communication opt. (2)

Transmission of measurements, states and alarms from circuit breaker to system opt. (2)

Transmission of the events and maintenance data from circuit breaker to system opt. (2)

Watchdog

Alarm and trip for release overtemperature ■

Check of release status ■

Interface with the user

Presetting parameters by means of keys and LCD viewer ■

Alarm signals for functions L, S, I and G ■

Alarm signal of one of the following protections: undervoltage, overvoltage, residual voltage, active reverse of power, phase unbalance, overtemperature ■

Complete management of pre-alarms and alarms for all the self-control protection functions ■

Enabling password for use with consultation in “READ” mode or consultation and setting in “EDIT” mode ■

Load control

Load connection and disconnection according to the current passing through the circuit breaker ■

Zone selectivity

Can be activated for protection functions S, G (1) ■

ABB offering

Table 24.

9.2 Molded case switches

To carry out the isolating function and to cut off the power supply from all or from a discrete section of the DC installation, the product range offered by ABB is:

The following tables show the electrical characteristics of the Tmax molded case switches:

Tmax molded case switches keep the same overall dimen-sions, verdimen-sions, terminals and accessories as Tmax molded case circuit breakers. This version only differs from the circuit breakers in the absence of the trip unit.

These molded case switches can be used up to 750 VDC (with T4D-T5D-T6D-T7D). The new Tmax PV line of molded case switches can be applied up to 1100 VDC.

See the tables of Chapter 7: ”Choice of the protective de-vice” for information on pole connection.

Tmax molded case switches

Table 25.

Rating [A] 100 150 225 150 225 250 400-600 800 1200

Poles [Nr] 3, 4 3, 4 3, 4 3, 4 3, 4 3, 4 3, 4 3, 4 3, 4

Magnetic

override ^[A] 1000 1500 2250 1500 2250 3000 5000 10000 20000

Rated voltage

AC (50-60 Hz) [V] 600Y/347 600Y/347 600Y/347 600 480 600 600 600 600

DC [V] 500 500 500 600 500 600 600 600 —

Reference

standard UL489 UL489 UL489 UL489 UL489 UL489 UL489 UL489 UL489

Table 26. Tmax

Rating [A] 160 250 250-320 400-630 630-800-1000

1000-1250-1600

standard IEC 60947-2 IEC 60947-2 IEC 60947-2 IEC 60947-2 IEC 60947-2 IEC 60947-2

Table 27. Tmax

41 E1B/E MS E2N/E MS E3H/E MS E4H/E MS E6H/E MS

Rated current (at 40° C) lu

[A] 800 1250 1250 3200 5000

[A] 1250 1600 1600 4000 6300

[A] 2000 2000

[A] 2500

[A] 3200

Poles 3 4 3 4 3 4 3 4 3 4

Rated service voltage Ve [V] 750 1000 750 1000 750 1000 750 1000 750 1000

Rated insulation voltage Vi [V] 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000

Rated impulse withstand voltage Vimp [kA] 12 12 12 12 12 12 12 12 12 12

Rated short-time withstand current Icw (1s) [kA] 20 20 25 25 40 40 65 65 65 65

Rated making capacity Icm 750 VDC [kA] 20 20 25 25 40 40 65 65 65 65

1000 VDC [kA] — 20 — 25 — 40 — 65 — 65

Reference standard IEC 60947-3

NOTE: The breaking capacity Icu, by means of external protection relay, with 500 ms maximum timing, is equal to the value of Icw (1s).

Emax switch disconnectors maintain the same overall di-mensions and the same accessories as the Emax air circuit breakers. This version differs from the circuit breakers only in the absence of trip units. These switch disconnectors are available both in fixed and withdrawable versions, three or

Table 28. Electrical characteristics of the Emax switch disconnectors:

four poles and can be used according to utilization category DC 23A (switching of motors or other highly inductive loads, e.g. motors in series).

Emax switch disconnectors

ABB offering

Annex A

Direct current distribution systems

The Standard IEC 60364-1 defines the direct current and alternating current distribution systems analogously:

TT system

a terminal of the system and the exposed conductive-parts are connected to two electrically independent grounding arrangements. If necessary, the middle point of the supply can be connected to ground.

Figure 18 TT DC system

Figure 19

TT DC system with the middle point of the supply connected to ground

The choice of grounding either the positive or the negative terminal is made according to considerations not treated in this Annex.

TT system

A terminal or the middle point of the supply is directly grounded; the exposed-conductive-parts are connected to the same grounded point. Three types of TN system are defined according to whether the grounded terminal and the protective conductor are separated or not:

1.TN-S system – the conductor of the terminal connected to ground and the protective conductor Gnd are separated.

L+

L-Exposed conductive parts

Grounding of system Grounding of exposed conductive-parts

L-M

Exposed conductive parts

Grounding of exposed conductive-parts Grounding of system

2.TN-C system – the functions grounded terminal and protective conductor are partially combined in a single conductor called GndN

Figure 22

TN-C DC distribution system Figure 23

TN-C DC distribution system with the middle point of the supply source connected to ground

3.TN-C-S system – the functions of the grounded terminal and of the protective conductor are partially combined in a single conductor called GndN and partially separated

Figure 24 TN-C-S DC distribution system Figure 25 TN-C-S DC distribution system with the middle point of the supply source connected to ground

L+

GndN (DC)

L-Exposed conductive parts

Grounding of system L+

Exposed conductive parts Grounding of system

GndN (DC)

Exposed conductive parts L+

Gnd

L-GndN (DC) L+

L-Gnd

M GndN (DC)

Grounding of system

TN-C system TN-S system

TN-C-S DC system

Grounding of system

TN-C system TN-S system

TN-C-S DC system

Exposed conductive parts

Annex A

IT system

The supply source is not grounded; the exposed-conductive-parts are connected to the same grounding point.

Figure 26 IT DC distribution system Figure 27 IT DC distribution system with the middle point of the supply isolated form ground

Exposed conductive parts

L+

L-L+

Grounding of exposed conductive-parts

L-Grounding of exposed conductive-parts Exposed conductive parts

Protection against indirect contact

To protect against direct and indirect contacts, IEC Standard 60364-4 mandates that the protective device shall automatically disconnect the supply so that in the event of a fault between a live part and an exposed-conduc-tive-part or a protective conductor, a voltage exceeding 120 VDC does not persist for a sufficient time to cause harmful physiological effects to a human body 1.

For particular environments, tripping times and voltage values lower than 120 VDC may be required. Further requirements for DC systems are being studied at present.

τ

i₁(t) i_p

0 t_p T_k t

i₂(t)

t_pB t

i_pB i_B

Annex B

Calculation of short-circuit currents

The study of short-circuit currents is fundamental for correct sizing of the components included in the plant.

Here are some brief considerations on how to assess the short-circuit current according to IEEE Std. 1375, “IEEE guide for the protection of stationary battery systems”, Annex C.1.1; and IEEE Std. 946, “IEEE Recommended Practice for the Design of DC Auxiliary Power Systems for Generating Stations”, Annex C.

This standard provides some calculation methods regarding the variations of the short-circuit currents relevant to electri-cal components acting as short-circuit current sources.

We take into consideration only the information about sta-tionary lead-acid batteries and give the time-current curves of the other sources (rectifiers in three-phase AC bridge connection for 60 Hz, smoothing capacitors and DC motors with independent excitation).

T`he following figure represents the typical curve of a direct short-circuit current:

Calculation of the short-circuit current provided by a stationary lead-acid battery

The following figure shows the curve of the short-circuit cur-rent delivered by a stationary lead-acid battery.

Annex B

The internal resistance of a cell can be calculated from its discharge characteristic curve. For this example, we will take the following values:

If we consider 10 positive plates:

The short circuit current at the cell terminals can be calculated as:

where E_c is the nominal cell voltage (2.00 V)

The short circuit current available at the load terminals of the main/battery circuit breaker, considering a battery of 60 cells, would be:

Where E_b is the nominal battery voltage

R_b is the total internal resistance of the battery = (0.0001385) (60) = 0.00831 Ω

R is the total external circuit resistance = 0.0100 Ω R_p = (V₁ - V₂)

= (1.7 - 1.52) (I₂ - I₁) (345 - 215)

R_p = 0.001385 Ω

Positive plate

R_t = 0.001385

= 0.0001385 Ω 10

I_c = E_c R_t

I_c = 2.0

= 14,440 Amps 0.0001385

I_b = E_b R_t

= (60 cells) (2.00 Volts

) = 120 V cell

i_p

t_p t

I_k i

i_p

t_p t

I_k1 i

I_k2

i_p

t_p t

i_p

tp t

I_k3 I_k4

The following table summarizes all the variations of the short-circuit currents indicated relevant to the different equipment acting as short-circuit sources:

Equipment acting as short-circuit

sources Short-circuit current variations Description

Stationary lead-acid battery

ip = peak short-circuit current tp = time to peak

Ik = quasi steady-state short-circuit current

Rectifiers in three-phase AC bridge connections for 50Hz without (Ik2) and with smoothing reactor (Ik1)

Smoothing capacitors

DC motors with independent excitation without additional inertia mass (Ik4) or with additional inertia mass (Ik3)

Annex B

Annex C

IEC circuit-breakers and molded case switch disconnectors for applications up to 1000 VDC

The main installations at 1000 VDC are used for traction, mines, road tunnels, railway applications, photovoltaic and industrial applications in general.

This high voltage is used in those plants where it is neces-sary to have distribution lines longer than normal LV lines or in those applications requiring significant power. In those circumstances, to keep the rated and the short-circuit cur-rents lower, it is necessary to increase the rated voltage of the plant.

Thus it is possible to use conductors with smaller cross sectional areas both in the switchboards as well as in the distribution lines. This causes a consequent reduction in the initial investment costs and in the running costs due to the decrease in the power losses caused by the joule effect.

Another advantage is space savings of the cable runs thanks to the reduction in their cross sectional area. For further applications, such as installation in mines, the nar-rowness of the available spaces enormously amplifies the problem of the arrangement of the run and of the position-ing of the conductors in relation to air/suction ducts and air conditioning.

Moreover, with 1000 V, it is possible to reduce the percent-age voltpercent-age drop, thus obtaining longer distribution lines.

This is one reason why this voltage is used in installations with particular requirements of length.

The increase in voltage also brings better service condi-tions thanks to the reduction in the short-circuit levels, thus limiting the consequences of possible faults and improving safety.

However, 1000 V affects the choice, the availability and the cost of the switching and protection devices which can be used. These special 1000 V versions have constructional characteristics necessary to meet the most severe require-ments.

ABB offering for use up to 1000 VDC

The range of products offered by ABB for applications up to 1000 VDC include products for the protection or the isola-tion of circuits. When choosing a circuit breaker, it is neces-sary to take into consideration the grounding of the plant.

This helps define the number of poles to be connected in series with the purpose of creating working conditions under which, if a short-circuit occurs, the current breaking is car-ried out by the series of the four circuit breaker contacts.

In the following pages, both the electrical characteristics of the products as well as the pole connection configurations are reported.

Annex C

Emax circuit breakers equipped with electronic trip units

Emax circuit breakers for use in direct current up to 1000 VDC can cover installation requirements up to 5000 A.

These circuit breakers have the same dimensions as the standard circuit breakers, and are available in the fixed and withdrawable versions and can be equipped with PR122-PR123DC electronic trip units. They are compatible with all the accessories provided for the standard version.

Tmax T4 Tmax T5 Tmax T6

Rated uninterrupted current, Iu [A] 250 400/630 630/800

Poles [Nr.] 4 4 4

Rated service voltage, Ve [V] 1000 1000 1000

Rated impulse withstand voltage, Vimp [kV] 8 8 8

Rated insulation voltage, Vi [V] 1150 1150 1000

Test voltage at power frequency for 1 min. [V] 3500 3500 3500

Rated ultimate short-circuit breaking capacity, Icu V V L

(DC) 4 poles in series [kA] 40 40 40

Rated service short-circuit breaking capacity, Ics

(DC) 4 poles in series [kA] 20 20

Utilization category (IEC 60947-2) A B (400 A) 1 - A (630 A) B 2

Insulation behavior ■ ■ ■

Reference Standard IEC 60947-2 IEC 60947-2 IEC 60947-2

Thermomagnetic trip units TMD ■ – –

TMA ■ ■ ■

1 Icw = 5 kA

2 Icw = 7.6 kA (630 A) - 10 kA (800 A)

Circuit breakers for use up to 1000 VDC

Tmax circuit breakers equipped with thermal magnetic trip unit

Tmax circuit breakers for use in direct current up to 1000 V have the same dimensions as the standard circuit breakers and are available in the fixed, plug-in and withdrawable version. They can be fed from the top only and can be equipped only with adjustable thermomagnetic trip units. They are compatible with all the accessories provided for the standard version except for the residual current release.

E2 E3 E4 E6

Rated uninterrupted current, Iu (A) B N N H S H H

(A) 800 1600 800 1600 1600 3200 3200

(A) 1000 1000 2000 2000 4000

(A) 1250 1250 2500 2500 5000

(A) 1600 1600 3200

(A) 2000

(A) 2500

Poles (Nr) 3/4 3/4 3/4 3/4

Rated voltage service, Ve V < 1000 < 1000 < 1000 < 1000

Rated impulse withstand voltage, Vimp kV 12 12 12 12

Rated insulation voltage , Vi V 1000 1000 1000 1000

Rated ultimate breaking capacity under short-circuit, Icu 1000 VDC (kA) 25 35 35 65 50 65 65

Rated service breaking capacity under short-circuit, Ics 1000 VDC (kA) 25 35 35 65 50 65 65

Rated short-time withstand current Icw (0.5s) 1000 VDC (kA) 25 35 35 65 50 65 65

Utilization category (IEC 60947-2) B B B B

Insulation behavior ■ ■ ■ ■

Electronic releases PR122/DC ■ ■ ■ ■

PR123/DC ■ ■ ■ ■

Electrical characteristics at 1000 VDC of Emax circuit breakers equipped with the new PR122-PR123/

DC trip unit

Electrical characteristics of Tmax circuit-breakers for 1000 VDC applications

-The table below shows the pole connection configurations with circuit breakers up to 1000 VDC according to the network connection types. This table is valid for both Tmax MCCBs equipped with thermomagnetic trip units (the connections shall be carried out by the customers) as well as for Emax ACBs equipped with the DC PR122-P123/DC electronic trip units (connections carried out in the factory by ABB).

Connection modalities of poles with circuit breakers for applications up to 1000 VDC

Rated voltage

(Vn) 1000 VDC

Type of

network INSULATED NETWORK NETWORK WITH ONE TERMINAL

CONNECTED TO GROUND 1 NETWORK WITH THE MIDDLE POINT OF THE SUP-PLY SOURCE CONNECTED TO GROUND

Description

With this network type, a fault is considered to be significant when it occurs between the positive and the negative terminal which makes the series of the four circuit breaker poles open the circuit.

The possibility of a double fault to ground (the first fault on the supply side of the poles of one terminal and the second one on the load side of the poles of the other terminal) is not considered. Therefore, it is

In document ABB circuit breakers for direct current applications (Page 36-60)